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TRANSCRIPT
E50417-G1176-C128-A4
SIPROTEC 7SN600
Transient earth-fault relay
Preliminary
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Transient earth-fault relaySIPROTEC 7SN600
Instruction Manual Order No. E50417-G1176-C128-A4
Figure 1.0: The 7SN600 transient earth-fault relay
Version 10.2002 © Siemens AG 2002www . El
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Trade marks
All brand or product names may be trade marks orregistered trade marks of the respective owner.
Disclaimer of liability
We have checked the contents of this documentfor agreement with the hardware and softwaredescribed. Since deviations cannot be precludedentirely, we cannot guarantee full agreement.However, the data in this manual are reviewedregularly and any necessary corrections includedin subsequent editions. Suggestions forimprovement are welcomed.
Copyright
The reproduction, transmission or use of thisdocument or its contents is not permitted withoutexpress written authority. Offenders will be liablefor damages. All rights, including rights created bypatent grant or registration of a utility model ordesign, are reserved.
Warranty
The contents of this instruction manual shall notbecome part nor modify any prior or existingagreement, commitment or relationship. The salescontract contains the entire obligations of Siemens.The warranty contained in the contract betweenthe parties is the sole warranty of Siemens. Anystatements contained herein do not create newwarranties nor modify the existing warranty.
Technical data subject to change.
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Safety Instructions ITransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Safety instructions
The following list of precautions is not intended asa complete description of all safety precautionswhich apply to the operation of the equipment(device, module) since particular operationalconditions call for additional measures.
Warning
Dangerous voltages may occur in certaincomponents of electrical devices during operation.Incorrect use of these devices can therefore resultin severe personal injury or substantial damage ofproperty.
• The earthing screw of the device must beconnected solidly to the protective earthconductor before any other connection ismade.
• Hazardous voltages may be present on allcircuits and components connected with thesupply voltage.
• Hazardous voltages may be present in thedevice even after disconnection of the supplyvoltage (storage capacitors).
• Devices with CT circuits must be terminated.
• The limit values given in the Technical data ofthe manual must not be exceeded at all, noteven during testing and commissioning.
• Only suitably qualified personnel should workon this device. Correct and safe operation ofthis device is dependent on proper handling,installation, operation and maintenance.
This instruction manual does not purport to coverall details in equipment, nor to provide for everypossible contingency to be met in connection withinstallation, operation or maintenance.
Should further information be desired or shouldparticular problems arise which are not coveredsufficiently for the purchaser’s purpose, the mattershould be referred to the local Siemens salesoffice.
Qualified personnel
A qualified person is one who is familiar with theinstallation, construction and operation of thedevice and who has the appropriate qualifications,e.g.
• is trained and authorized to operate andmaintain devices/systems in accordance withestablished safety practices for devices withelectrical circuits.
• is trained in the proper care and use ofprotective equipment in accordance withestablished safety practices.
• is trained in first aid.
CE Conformity
This product complies with the directive of theCouncil of the European Communities on theapproximation of the laws of the member statesrelating to electromagnetic compatibility (EMCCouncil Directive 89/336/EWG) and concerningelectrical equipment for use within certain voltagelimits (Low-voltage Directive 73/23/EWG).
This conformity is proved by tests conducted bySiemens AG in accordance with Article 10 of theCouncil Directive in agreement with the genericstandards EN 50081 and EN 50082 for EMCdirective, and with the standards EN 60255-6 forthe low-voltage directive.
The device is designed and manufactured forapplication in industrial environments.
The device is designed in accordance with theinternational standards of IEC 255 and the Germanstandards DIN 57 435 part 303 (corresponding toVDE 0435 part 303).
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I List of contentsTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
List of contents
1 Application............................................................................................................ 71.1 Earth fault directional determination ................................................................................................... 71.2 Detection of the fault location ............................................................................................................. 91.3 Functions and features ..................................................................................................................... 10
2 Method of operation........................................................................................... 112.1 Detection of transients in the current path........................................................................................ 112.2 Detection of transients in the voltage path ....................................................................................... 122.3 Detection of fundamental wave in the voltage path.......................................................................... 122.4 Evaluation logic for directional indication.......................................................................................... 132.5 Evaluation logic for transient fault indication .................................................................................... 142.6 Evaluation logic for continuous earth faults...................................................................................... 152.7 Reset logic ........................................................................................................................................ 162.8 Binary inputs ..................................................................................................................................... 172.9 Operating status LEDs ..................................................................................................................... 172.10 Function test using the front keys..................................................................................................... 18
3 Operating instructions....................................................................................... 193.1 Safety precautions............................................................................................................................ 193.2 Connection of the current and voltage transformers ........................................................................ 193.3 Connection to auxiliary power supply............................................................................................... 203.4 Settings............................................................................................................................................. 203.4.1 Opening the device to make the settings ......................................................................................... 203.4.2 Layout of setting elements................................................................................................................ 203.4.3 Settings............................................................................................................................................. 213.5 Internal test using the "Test" keys on the front................................................................................. 223.5.1 Testing the directional indication ...................................................................................................... 223.5.2 Testing the continuous earth fault indication .................................................................................... 223.6 External test using test equipment 7VP83 ....................................................................................... 223.6.1 Test equipment 7VP83 and connection of the test object ................................................................ 223.6.2 Testing the earth-fault direction signal.............................................................................................. 233.6.3 Testing the continuous earth fault signal .......................................................................................... 23
4 Technical data .................................................................................................... 244.1 Tabular overview of technical data ................................................................................................... 244.2 Ordering code / MLFB ...................................................................................................................... 25
5 Housing types and dimensions Panel flush mounting ................................... 265.1 Dimensions for panel flush mounting ............................................................................................... 265.2 Dimensions for panel surface mounting (terminals on the side) ...................................................... 275.3 Dimensions for panel surface mounting (terminals on up / down) ................................................... 285.4 Front view of relay ............................................................................................................................ 29
6 Connection diagram........................................................................................... 306.1 Panel flush mounting and panel surface mounting (terminals on the side)...................................... 306.2 Panel surface mounting (terminals on up / down) ............................................................................ 31
7 Appendix ............................................................................................................. 337.1 List of figures .................................................................................................................................... 33
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Application 1Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 7 - 36
1 Application
1.1 Earth fault directional determinationThe highly sensitive transient earth-fault relay7SN60 determines the direction of transient andcontinuous earth faults in systems with isolatedneutral, in systems with high-impedance resistiveearthing and in compensated systems.
Continuous earth faults are indicated with a delay,either in conjunction with a transient earth-fault andsubsequently persisting displacement voltage, orwith just the displacement voltage present.
In the event of an earth fault, the neutral-pointvoltage to earth can be as high as the full phasevoltage.
The phase-to-earth capacitances of the non-earth-faulted phases are charged via the transformerinductance.
This charging process is bound up with a strongcurrent surge (starting oscillation).
The amplitude of this current surge depends on theexpands of the system and on the contactresistance values at the earth-fault location.
This current flows via the phase-to-earthcapacitances of the unaffected lines to earth,enters the earth-faulted phase via the earth-faultlocation and flows back from there to the feedingtransformer.
Thus the direction of the earth-fault inducedcurrent surge is identical with that of the short-circuited current at the same location (seefigure 1.1).
Figure 1.1: Fault currents in the system
12
34
A
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1 ApplicationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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At measuring point A, as a result of the transformersummation circuit, the earth current of the faultedline is not included in the measurement, as thiscurrent portion flows though the summationtransformer of the relevant Holmgreen circuit andback, thereby cancelling itself out.
It is the total of the capacitive earth currents fromthe non-faulted system which has an effect. In thediagram they are summated on the upper line. Thecapacitive currents of the non-faulted lines 1, 3 and2, 4 accumulate vectorially, which is why only threearrows instead of four are shown at measuringpoint A.
With a transient earth fault, the equalizing currentforming with a damped oscillation of 100 to morethan 1 000 Hz decays after only a few periods.
The displacement voltage UEM thereupon alsoreturns to zero. In earthed systems this takes placeafter a number of periods (decay of the Petersencoil – earth capacitance oscillation circuit); in non-
earthed systems this occurs after a very short time(figure 1.2).
In the case of a continuous earth fault, theequalizing current in the non-earthed systemchanges into the mostly capacitive continuousearth current or, in compensated systems, into therelatively low residual active current.
For the directional determination, the direction ofthe first transient of neutral current anddisplacement voltage is considered.
The device indicates the direction of the transientearth fault by LEDs (red = forward direction, yellow= reverse direction) and the relevant signallingrelay picks up.
Continuous earth faults are indicated after asettable time by an LED on the device andsignalled by a signalling relay.
Figure 1.2: Neutral current and displacement voltage
I0
t1
UEM
Earth faultStart
End
t
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Application 1Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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1.2 Detection of the fault locationIf the system is of radial configuration (figure 1.3),the red lamp immediately indicates the faulted line.
If one of the lines consists of several sections(figure 1.4), the fault is upstream of the last redlamp.
The transient earth-fault relay can also be usedwithout restrictions in any type of meshed systems(figures 1.5 and 1.6). Transient earth-fault relaysdistributed at suitable points throughout the systemallow detection of the earth-fault location from thedirectional indications.
Figure 1.3: Radial system
Figure 1.4: Cascadedradial system
Figure 1.5: Ring system Figure 1.6: Meshed system
Red LED "forward direction"
Yellow LED "reverse direction"
No indication
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1 ApplicationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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1.3 Functions and features
• Device versions for panel surface mounting offlush mounting, with terminals on the side, in7XP20 housing
• Both fault directions indicated by LEDs andsignalled by relays
• High pick-up sensitivity due to separatedetection and evaluation of total current anddisplacement voltage
• 1 A and 5 A rated current selectable for currenttransformer matching
• 16 selectable pickup thresholds for detection oftransients in the current path even with highersteady-state total currents of 10 mA to 300 mA
• Fixed pickup threshold of 5 V for detection oftransients in the voltage path even in case ofhigher steady-state displacement voltages
• 4 selectable pickup thresholds for evaluation ofthe displacement voltage of 10 V to 50 V
• Optional suppression of switching operationsby evaluation of the displacement voltage aftera switching-induced transient has occurred.
• Wide-range power supply for connection to110 / 230 V AC systems, 60 – 250 V DCstation batteries or 100 V AC voltagetransformers without switchover
• Binary inputs for remote reset and blockingwith extremely wide input voltage range of24 to 250 V DC
• Automatic reset of direction indications andsignals after 3 s or 10 s (selectable)
• Automatic reset in case of intermittent earthfaults only after the last earth fault, i.e. thecorrect indication and signal of the first earthfault is preserved
• Detection of the displacement voltage andearth fault indication / signal, independent of atransient fault detection
• Signalling and indication of a continuous earthfault possible only in the forward direction
• Command contacts of all signalling relays
• Fault indication if sensitivity is set too high
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Method of operation 2Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2 Method of operation
2.1 Detection of transients in the current pathThe summation current of the cable-type CT or ofthe three phase-current CTs in Holmgreen circuit istransformed into a proportional voltage in the inputcircuit (see figure 2.1).
A surge voltage protector protects the internalelectronic system of the device.
To match primary CTs to 1 A or 5 A, the burden isswitched over by setting jumper X2.
Switches S3.3-6 are used in conjunction with anamplifier to set the sensitivity of the transient earthfault relay.
Special filters are provided downstream forcomplete suppression of the fundamental wavecontent. The relay thus detects only transients ofthe type observed in a system in the case of earthfaults.
The proportional transient voltage is supplied toone positive and one negative comparator andthereby digitized. These digital signals I_pos. andI_neg. are generated separately in real time; onlyone signal can be active at any one time.
Figure 2.1: Detection of transients in the current path
PickupsensitivityS3.3 - S3.6
Oscillating circuit
Subtractor
Limit stages
X2
1A / 5A
Current transformer
I_pos.
I_neg.
P
NI0
I Test
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2 Method of operationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.2 Detection of transients in the voltage pathThe three phase voltages form the virtual starpointof the voltage transformer delta via the summationresistors in star-delta connection. Hence, thedisplacement voltage of the system is locatedbetween this point and the supplied earth potentialof the transformers (see figure 2.2).
Surge voltage protectors protect the voltagetransformer against excessive transient voltages.
For the detection of transients, special filters areprovided downstream of the voltage transformer
which suppress completely the fundamental wavecontent. The relay thus detects only transients ofthe type observed in a system in the case of earthfaults.
The proportional transient voltage is supplied toone positive and one negative comparator andthereby digitized. These digital signals U_pos. andU_neg. are generated separately in real time; onlyone signal can be active at any one time.
Figure 2.2: Detection of transients and of fundamental wave in the voltage path
2.3 Detection of fundamental wave in the voltage pathFor the detection of the fundamental wave, a low-pass filter is provided downstream of the voltagetransformer. The relay thus detects thedisplacement voltage that is observed only in caseof a transient or continuous earth fault in thesystem (see figure 2.2).
Switches S3.7-8 are used in conjunction with anamplifier to the sensitivity for the detection of thedisplacement voltage.
The proportional voltage is supplied to acomparator that makes digital signals available forthe duration of the earth fault if the triggerthreshold is exceeded.
Oscillatingcircuit
Limit stages
U_pos.
U_neg.
Voltagetransformer
Subtractor
Summing unit
Input protectioncircuit
Limit stage
U_Test
P
N
P
U0
Filter
PickupsensitivityS3.7 - S3.8
U_Test
U_Fund
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Method of operation 2Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.4 Evaluation logic for directional indicationWhen the transient earth-fault relay is ready tooperate, the evaluation logic is started by thedetection of a neutral current Io and the first of thetwo signals "I_pos." or "I_neg." (see figure 2.3).
The digitized measured values are evaluated in aprogrammable logic device (PLD). The procedureis controlled by a clock-pulse generator.
To ensure that only those transients are detectedthat occur in connection with transient groundfaults, the circuit evaluates only signals that arepresent for more than 50 µs or 150 µs. Theminimum signal duration is set using switch S2.8.The default setting for standard applications is150 µs, which is equivalent to a frequency
threshold of 3 kHz up to which the transient isreliably detected. The first signal leaving the filter,e.g. "I_pos.", sets the input memory (S Ip) andblocks at the same time via an OR gate the otherinput memory (R In). The first transient received isstored as I_pos.
Simultaneously, a timer is started that opens atime window of 1 ms or 4 ms for detection of thevoltage transient. This interval can be set by switchS3.2. The default setting for standard applicationsis 4 ms. Any signal U_pos." or "U_neg." arrivingduring this interval is stored in the same way as forthe current path.
Figure 2.3: Directional indication
=1
S IpR Ip
S InR In
=1
=1
S UpR Up
S UnR Un
=1
&
&
50/150µs
=1
=1
&
Filter
Filter
1/4ms
Clock pulse
Input memory
U_Reset
Timewindow
I_pos.
I_neg.
U_pos.
U_neg.Input memory
&
&
&
&
=1
=1
Start 1
Directionaldetermination
U_Reset
R_Forw
R_Rev
G_Reset&Block
S3.2
S2.8
S2.8
50/150µs
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2 Method of operationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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If no transient voltage is detected within the timewindow, a reset signal "U_Reset" is generated. AGeneral Reset signal (which is generated if otherreset criteria are fulfilled as well) resets allmemories and makes the relay ready to operateagain. Additionally, the “Blocked” LED is set for500 ms. This LED allows to recognize duringcommissioning whether repeated spurious pickupsof the transient earth-fault relay are due tointerference or to a pickup threshold in the currentpath that is set too low. The alarm relay is not set.
The information that has been frozen in the inputmemories is now evaluated. If the first transientcurrent and voltage have the same direction, thefault is in reverse direction ("R_Rev"). If thedirections are different, it is in forwards direction("R_Forw").
"Start 1" starts further plausibility checks. The"Block" signals allows to block the relay bydisabling the clock pulse generator.
2.5 Evaluation logic for transient fault indicationOn delivery, the device is set so that it does notpick up when switching operations take place inthe system. A check is performed whether 90 msafter startup the displacement voltage still exceedsthe value set with switch S3.7-8. This value is inthe range between 10 V eff and 50 V eff.
To do so, each "U_fundamental" pulse isprolonged by one period, so that a continuoussignal is present for the duration of the earth fault.If this signal still subsists after 90 ms, the LEDsand signalling relays for “Transient earth faultforward” or “Transient earth fault reverse” are set.
This indication remains stored unit a reset isperformed.
If the condition detected is not a transient earthfault, the transient earth-fault relay is reset.
The suppression of switching operations can bedeactivated using switch S2.1. Since in isolatedsystems the displacement voltage Uo is only brieflypresent and a transient earth fault would not beindicated in that case, the function can bedisabled.
NOTE! The device now detects and indicatesswitching operations.
Figure 2.4: Evaluation logic for transient fault indication
Transientearth faultforward
&
&
1ms
&
SR
SR
90ms
25/65msTransientearth faultreverse
Transientearth faultforward
Transientearth faultreverse
TEF_Reset
Clock pulseG_Reset
&
R_Forw
R_Rev
Start 1
U_Fund
TEF_RevTEF_Forw
=1
S2.
1
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Method of operation 2Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.6 Evaluation logic for continuous earth faultsWith S2 in as-delivered position, continuous earthfaults are only indicated and output via signallingrelay if:
• a transient earth fault of any kind has beendetected and the displacement voltage Uo hasbeen present for at least 2.4 s, or
• only the displacement voltage Uo has beenpresent for at least 2.4 s.
The monitoring time can be set incrementallybetween 0 and 2.4 s using switch S2.4-5.
If continuous earth faults are to be indicated only incase of each transient earth fault and thedisplacement voltage Uo has been present for atleast 2.4 s, switch S2.2 must be set to ON andswitch S2.3 must be set to OFF.
If continuous earth faults are to be indicatedregardless of the detection of a transient earth
fault, i.e. with only the displacement voltagepresent, switch S2.2 must be set to ON.
If continuous earth faults are to be indicated only incase of a transient earth fault in forwards directionand the displacement voltage Uo has been presentfor at least 2.4 s, switches S2.2 and S2.3 must beset to ON.
The enable for the indication and signalling ofcontinuous ground faults is stored but drops offimmediately when the displacement voltagedisappears. If the stored transient fault indication isnot reset, the next “continuous earth fault” isindicated and signalled with delay.
The LED for indicating Uo> always lights upimmediately when the displacement voltageexceeds the preset value.
Figure 2.5: Evaluation logic for continuous earth faults
SR
&
1ms
S2.4
S2.5
S2.3
0-2.4s (not stored)Earth fault
Clockpulse
TEF_ForwU_Fund
red
red
&
&
=1
S2.2
TEF_Rev =1 &
&
=1
25/65ms
G_Reset
TEF_FR
Continuousearth fault
Continuousearth fault
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2 Method of operationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.7 Reset logicThe violation of internal plausibility checks causesa number of different resets. Moreover, the devicecan be reset locally or by remote control.
Each reset leads to a general reset "G_Reset"which leaves the device ready for operation andset to alert.
Internal reset logic
U_Reset:Used in cases where a current transient has beendetected but no voltage transient has occurredduring the monitoring time (“Blocked” LED shinesfor 500 ms).
TEF_Reset:Used in cases where no transient fault indication isto be output if the fault direction has beendetermined but the displacement voltage is absent(suppression of switching operation).
Auto_Reset:Switches S2.6 and S2.7 can be used to start anautomatic reset after a settable delay of 3 or 10 s.The automatic reset is started as soon as thedisplacement voltage drops off.
In the case of intermittent earth faults, the time isrestarted on each voltage dropoff during theruntime, i.e. the first transient fault is indicated.
External reset logic
Local_Reset:The device can be reset locally by pressing the (R)key on the front panel. On pressing that key, ageneral reset is performed along with a lamp test(all LEDs light up).
Remote_Reset:A remote reset is possible via a binary input. Onactivating the binary input, a general reset isperformed along with a lamp test (all LEDs lightup).
Figure 2.6: Reset logic
S2.7
1ms3/10s
G_Reset
Auto_Reset
U_Fund
S2.6
&
=1U_Reset =1TEF_Reset
Remote_Reset
on front panel
25/65ms
=1TEF_FR
Local_Reset
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Method of operation 2Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.8 Binary inputsThe transient earth-fault relay has two wide-rangebinary inputs for the functions “Remote reset”(reset signals) and “Blocking” (freeze signals).
The inputs can be activated with a voltagebetween 24 V and 250 V DC and are protectedagainst polarity reversal.
Jumpers X30 and X31 can be used to increase thepickup threshold from approx. 19 V DC to approx.75 V DC.
As the inputs are galvanically separated, they canbe fed by different battery circuits.
Figure 2.7: Binary inputs
2.9 Operating status LEDsThe device has on its front panel a green LED“Service” and a red LED “Blocked”.
The green “Service” LED shines as long as theauxiliary voltage is present and the programmablelogic device is working.
The red “Blocked” LED shines to indicate thefailure of an internal supply voltage or repeated
interference-induced spurious triggering of a toosensitive current input.
In that latter case, the sensitivity of the inputshould be reduced by means of the switchesS3.3-6.
The alarm relay is of the NC type; it signals aninternal or external failure of the auxiliary supplyvoltage.
Figure 2.8: “Blocked” signal
X31
I const.2mA R_Reset
Remote_Reset
X30
I const.2mA Block
Blocking
500ms
AlarmU_Reset
red
P5
&N15
P15 Alarm
=1
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2 Method of operationTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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2.10 Function test using the front keysBy pressing one of the two keys “Test >“ or “Test<” in the sealed keypad on the front panel, atransient fault can be simulated. For that purpose,“transients” are fed into the measuring systemdownstream of the input transformers, and theappropriate directional indication is output on thebasis of the polarity relationship between the
current and the voltage transient. The testcomprises the filters, the limit stages, theevaluation logic, the indications and the signallingrelays. The test signal is maintained for as long asthe Test key is pressed, which allows to test thefunction of the continuous earth fault indication aswell.
Figure 2.9: Function test
&
P 100Hz
&
P
P
P
P
N
U_Test
I_Test
Testforwarddirection
Testreversedirection
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Operating instructions 3Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 19 - 36
3 Operating instructions
3.1 Safety precautionsAll safety precautions which apply for work inelectrical installations must be observed duringcommissioning.
3.2 Connection of the current and voltage transformersFigure 3.1 shows the connection of the current andvoltage transformer set in Holmgreen circuit.
Here, the starpoint at the line-side of the c.t. mustbe connected to terminal 1 while the starpoint atthe bus-bar side of the c.t.s must be connected to
terminal 2.
The three phase voltages UL1, UL2 and UL3 areconnected to terminals 7, 8, 9 respectively. Theearthed starpoint of the voltage transformer isconnected to terminal 10.
Figure 3.1: Connection of transformers and auxiliary power supply
Auxiliaryvoltage
UE
UL3
UL2
UL1
I E
I N
AC/DC
DC
1
2
7
8
9
10
30
31
Line protection
e.g. for 7SN600x-xBA00 and 7SN600x-xEA00
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3 Operating instructionsTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
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3.3 Connection to auxiliary power supplyThe wide-range power supply of the 7SN60transient earth-fault relay is suited for ratedvoltages from 60 V to 250 V DC and from 100 V to230 V AC.
The device is protected by an internal fuse butshould have an external protection as well.
Using terminals 30 / 31 and an external m.c.b. orfuse, the transient earth-fault relay be connectedeither to a station battery or directly to the voltagetransformers (Figure 3.1).
3.4 Settings
3.4.1 Opening the device to make the settingsAll settings are made on the p.c.b. inside thedevice.
Therefore, the device must be opened to make thesettings. Proceed as follows:
• Switch off the auxiliary power supply and takethe necessary precautions against electrostaticdischarges. The c.t. connectors are shorted onwithdrawing the p.c.b.
• Slip away the covers at the top and bottom ofthe front panel to gain access to the fixingscrews of the module.
• Unscrew these screws.
• Pull out the front panel with the attached p.c.b.
• Make all necessary settings on jumpers X2,X30, X31 and on switches S2 / S3.
• Proceed in opposite order to reclose thedevice and switch the auxiliary voltage supplyon again.
The device is ready for operation again as soon asthe green “Service” LED shines and the red“Blocked” LED has gone out.
3.4.2 Layout of setting elements
Figure 3.2: Layout of setting elements (position as delivered)
S3 S2
S31
S30
X2
13
1
3
Currenttransformer
Voltagetransformer
Term
inal
blo
ck
OFFON
1
3
1 8 1 8
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Operating instructions 3Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 21 - 36
3.4.3 SettingsThe matching of the measuring circuits to the 1 Aor 5 A primary current transformers is performedby setting jumper X2.
The pickup sensitivity is set by switches S3.3 -S3.6. The setting is determined by the system’searth current IE in uncompensated state, converted
to the secondary-side value of the currenttransformers. The sensitivity should be set to abouthalf the value of the calculated current.
All other functions should be set as requiredaccording to the following table.
S3.1 S3.2 S3.3 S3.4 S3.5 S3.6 S3.7 S3.8Not used
X Not used4 ms time window for voltage transients
X 1 ms time window for voltage transientsPickup value 1A 10 mA 5A 50 mA
X in the current path 30 mA 150 mAX at 1kHz 50 mA 250 mA
X X 70 mA 350 mAX 90 mA 450 mA
X X 110 mA 550 mAX X 130 mA 650 mA
X X X 150 mA 750 mAX 160 mA 800 mA
X X 180 mA 900 mAX X 200 mA 1000 mA
X X X 220 mA 1100 mAX X 240 mA 1200 mA
X X X 260 mA 1300 mAX X X 280 mA 1400 mA
X X X X 300 mA 1500 mAPickup value 10 V
X Voltage Uo> 20 VX 30 VX X 50 V
S2.1 S2.2 S2.3 S2.4 S2.5 S2.6 S2.7 S2.890 ms suppression of switching operations
X No suppression of switching operationsContinuous earth fault indication upon Uo>
X Continuous earth fault indication upon each transient fault and Uo>X Continuous earth fault indication upon Uo>
X X Continuous earth fault indication upon transient fault forwards and Uo>Continuous earth fault indication immediately
X Continuous earth fault indication after 0.8 sX Continuous earth fault indication after 1.6 s
X X Continuous earth fault indication after 2.4 sNo automatic reset
X Automatic reset 10 s after Uo> has dropped offX X Automatic reset 3 s after Uo> has dropped off
150 µs input filter IoX 50 µs input filter Io
X2 X30 X311-2 5 A rated current2-3 1 A rated current
1-2 19 V pickup voltage of the blocking input2-3 75 V pickup voltage of the blocking input
1-2 19 V pickup voltage of the remote reset input2-3 75 V pickup voltage of the remote reset input
X = Switch onBold = Position as delivered
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3 Operating instructionsTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
22 - 36 Siemens AG – 05.10.2002
3.5 Internal test using the "Test" keys on the frontThe correct evaluation in the 7SN60 transientearth-fault relay can be tested with the keys"Test >" for forward direction and "Test <" forreverse direction. This test comprises all functions
relating to directional indication and continuousearth fault indication, starting directly after the inputtransformers and as far as the indications andsignalling relays.
3.5.1 Testing the directional indicationOn pressing the "Test >" key, the red LED “>” mustlight up on the tested device after approx. 100 ms(with suppression of switching operations), and atthe same time the “Transient earth fault forward”signal must be output at the relevant relay.
On pressing the "Test <" key, the red LED “<” mustlight up on the tested device after approx. 100 ms
(with suppression of switching operations), and atthe same time the “Transient earth fault reverse”signal must be output at the relevant relay.
The signals remain stored until an automatic, localor remote reset is performed. These functions canbe tested as well after the directional indicationtest.
3.5.2 Testing the continuous earth fault indicationTo test the “Continuous earth fault” signal, the keymust be held pressed down for at least the time setfor this function. The “Continuous earth fault”signal and the relevant output via the signalling
relay will appear after the set time has elapsed.Upon release of the key, the continuous earth faultindication and signal drop off again.
3.6 External test using test equipment 7VP83A function test of the transient earth-fault relay,including a test of the connection wiring and input
transformers, can be carried out with testequipment 7VP8300-0.
3.6.1 Test equipment 7VP83 and connection of the test objectThe test equipment serves to test the transientearth-fault relays 7TG23, 7SN60, 7SN70 and7SN71. It operates with the 230 V AC mainsvoltage. Test current Io and test voltage Uo for thedirectional detection of the transient earth fault aremade available via the terminal sockets. Theconnection of the test current/voltage and thephase rotation of the current are effected bymeans of pushbutton S1. Activation of the testcurrent/voltage is indicated by LED H1.
All safety precautions which apply for work inelectrical installations must be observed duringtests.
Before testing, the current and voltage inputs ofthe test object must be isolated, becauseotherwise the accuracy of the test results can beinvalidated.
The test object is connected to test equipment7VP83 as shown in figure 3.3.
IMPORTANT!Before starting the test, the neutral current pickupsensitivity of the 7SN 60 transient earth-fault relaymust be set to maximum. The displacementvoltage pickup sensitivity must be set to 20 V orless. These are also the settings as delivered.
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Operating instructions 3Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 23 - 36
Figure 3.3: Test setup
3.6.2 Testing the earth-fault direction signalIf the pushbutton of 7VP83 is pressed to “forward”,the red LED “>” must light up on the test objectafter approx. 100 ms (with suppression ofswitching operations), and at the same time the“Transient earth fault forward” signal must beoutput at the relevant relay.
If the pushbutton of 7VP83 is pressed to “reverse”,the red LED “>” must light up on the test objectafter approx. 100 ms (with suppression ofswitching operations), and at the same time the“Transient earth fault reverse” signal must beoutput at the relevant relay.
The transient fault signals remain stored until anautomatic, local or remote reset is performed.These functions can be tested as well after thedirectional indication test.
Connection of the test current/voltage isindependent of the phase relation of the linevoltage. If testing is started during zero crossing ofthe voltage wave, an incorrect directional detectionmay result. In this case, repeated measurementsmust be carried out. The test must also take intoaccount the current settings of pickup thresholdsand functional scope (see also 3.4.3).
3.6.3 Testing the continuous earth fault signalTo test the “Continuous earth fault” signal, the keymust be held pressed down for at least the time setfor this function. The “Continuous earth fault”signal and the relevant output via the signallingrelay will appear after the set time has elapsed.
Upon release of the key, the continuous earth faultindication and signal drop off again.
The LED “Io>“ indicates the presence of thedisplacement voltage as long as that voltageexceeds the set value. This indication is not outputvia relay.
UE
UL3
UL2
UL1
I E
I N 1
2
7
8
9
10
230V AC
7SN607VP8300-0
UL
UE
I E
I N
M 0,1
S1 H1
e.g. for 7SN600x-xBA00 and 7SN600x-xEA00
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4 Technical dataTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
24 - 36 Siemens AG – 05.10.2002
4 Technical data
4.1 Tabular overview of technical data
Measuring circuit Current inputRated current IoInput impedance Z at 50 Hz and 1 x INThermal rating in current path, continuous
10 s1 s (at 1 A)1 s (at 5 A)
Voltage InputsRated voltage UNRated frequency fNBurden vt circuits at 100 VThermal rating in voltage path, continuous
1 A or 5 A< 0.05 Ω4 x IN30 x IN100 x IN300 A
100/110 V AC50 Hz (16 2/3 Hz)< 0,12 VA140 V AC
Auxiliary voltage Rated auxiliary voltage Uaux 24 – 60 V DC or 60 – 250 V DC and100 – 230 V ACwithout switchover
Power consumptionat 60 V DC
110 V DC220 V DC250 V DC
100 V AC110 V AC230 V AC
non-energized3.1 W3.0 W3.6 W3.7 W
2.9 VA3.0 VA4.6 VA
energized4.5 W4.5 W4.6 W4.8 W
4.2 VA4.2 VA5.8 VA
Binary inputs Input voltage for blocking and remote reset inputPickup thresholds forBlocking X30 pin 1-2, remote reset X31 pin 1-2Blocking X30 pin 2-3, remote reset X31 pin 2-3
24 – 250 V DC
approx. 19 Vapprox. 75 V
Signalling relays Number of relays, forward or reverse directionNumber of relays, continuous earth fault signalNumber of relays, alarm
Switching capacity make (all relays)Switching capacity break (all relays)Switching voltagePermissible switching current continuous
0.5 s
2 NO contacts1 NO contact1 NC contact
1000 W / VA30 W / VA250 V AC/DC5 A30 A
Version Housing, dimensions
For flush mounting, terminals on the backFor panel surface mounting, terminals on the sideFor panel surface mounting, terminals on up/down
Weight
SIPROTEC 1/6 widesee dimensional drawings
6 current / 25 voltage terminals6 current / 25 voltage terminals28 terminals
approx. 4 kg
Standards DIN VDE 0435, Part 303 and IEC 255-5 -
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Technical data 4Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 25 - 36
4.2 Ordering code / MLFB
Designation Order no.:
Transient earth-fault relay 7SN600 - A 0 0In SIPROTEC housing 1/6 wide
50 Hz rated frequency 016 2/3 Hz rated frequency 1
Auxiliary voltage 60-250V DC and100-220V AC without switchover
0
Auxiliary voltage 24-48V DC 1
Housing for panel surface mounting withterminals on the side
B
Housing for panel surface mounting withterminals on up / down
D
Housing for panel flush mounting or cubiclemounting
E
Figure 4.1: Ordering code / MLFB
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5 Housing types and dimensionsTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
26 - 36 Siemens AG – 05.10.2002
5 or M4
6
7.3 56.5 +/-0.3
245
71 +2
255.
8+/
-0,.3
5.4
Current connections (terminals 1 - 6)Insulated ring cable lugs: for screws up to 6 mm Maximum outer width 13 mm Type e.g. PIDG from AMP Co. Conductors with cross-section 2.7 mm2 to 6.6 mm2
In parallel double leaf- spring-crimp contact : for diameters of 2.5 to 4.0 mm2
Control connections (terminals 7 - 31)Insulated ring cable lug: for screws up to 4 mm Maximum outer width 9 mm Type e.g. PIDG from AMP Co. Conductors with cross-section 1.0 mm2 to 2.6 mm2
In parallel double leaf- spring-crimp contact: for diameters of 0.5 to 2.5 mm2
Panel cutoutDimensions in mm
5 Housing types and dimensions Panel flush mounting
5.1 Dimensions for panel flush mounting
Figure 5.1: Dimensions for panel flush mounting
172
29,5
266
37
244
Terminals
75
70
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Housing types and dimensions 5Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 27 - 36
Current connections (terminals 1 - 6)Insulated ring cable lugs: for screws up to 6 mm Maximum outer width 13 mm Type e.g. PIDG from AMP Co. Conductors with cross-section 2.7 mm2 to 6.6 mm2
Cable end sleeves are required for stranded conductorsIn parallel double leaf- spring-crimp contact : for diameters of 2.5 to 4.0 mm2
Control connections (terminals 7 - 31)Insulated ring cable lug: for screws up to 4 mm Maximum outer width 9 mm Type e.g. PIDG from AMP Co. Conductors with cross-section 1.0 mm2 to 2.6 mm2
In parallel double leaf- spring-crimp contact: for diameters of 0.5 to 2.5 mm2
Cable end sleeves are required for stranded conductors
Dimensions in mm
5.2 Dimensions for panel surface mounting (terminals on the side)
Figure 5.2: Dimensions for panel surface mounting (terminals on the side)
12
7
31 32
8
77128
300
280
9
100
260
29.5
55
266
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5 Housing types and dimensionsTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
28 - 36 Siemens AG – 05.10.2002
5.3 Dimensions for panel surface mounting (terminals on up / down)
Figure 5.3: Dimensions for panel surface mounting (terminals on up / down)
1 7148
15 212822 29,5
266
27
9
92
77
280
360
75
Dimension in mm
260
Screw M4
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Housing types and dimensions 5Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 29 - 36
5.4 Front view of relay
Figure 5.4: Front view of relay
Uo >
ServiceBetrieb
BlockedStörung
R
Test
Test
Reset
SIEMENS
SIEMENS
7SN6000-0EA00
Slip cover upwardsto open
Slip cover downwardsto open
Rating plate
Test key TEF forwardsand continuous earth fault
Reset key
Red LED Transient earth fault forward
Green LED "Service"
Red LED "Blocked"
Yellow LED Transient earth fault reverse
Red LED Continuous earth fault
Red LED Displacement voltagepresent
Test key TEF reverseand continuous earth fault
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6 Connection diagramTransient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
30 - 36 Siemens AG – 05.10.2002
6 Connection diagram
6.1 Panel flush mounting and panel surface mounting (terminals on the side)
Figure 6.1: Connection diagram 7SN600x-0BA00 and 7SN600x-0EA00
Auxiliaryvoltage
L-Blocking L+
L-Remote reset L+
UE
UL3
UL2
UL1
I E
I N
AC/DC
DC
Binaryinput
Binary-input
1
2
7
8
9
10
12
11
14
13
30
31
1L+
2L+
Transient earth faultforward
1L+
2L+
Continuousearth fault
1L+
Auxiliaryvoltagefailure
Line protection
Bus bar
L+/L1
L-/N
Transient earth faultreverse
7SN600x-0BA00 and 7SN600x-0EA00
20
17
18
21
19
22
26
24
25
23
16
15
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Connection diagram 6Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 31 - 36
6.2 Panel surface mounting (terminals on up / down)
Figure 6.2: Connection diagram 7SN600x-0DA00
UE
UL3
UL2
UL1
I E
I N
AC/DC
DC
L+
L-
1L+
2L+
Transient earth faultforward
1L+
2L+
Continuousearth fault
1L+
Auxiliaryvoltagefailure
Transient earth faultreverse
Line protection
Bus bar
L-Blocking L+
L-Remote reset L+
Auxiliaryvoltage
Binary-input
Binary-input
7SN600x-0DA00
26
25
24
20
17
18
19
27
15
16
11
13
1
3
4
5
6
7
9
10
23
21
22
28
12
14
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Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
32 - 36 Siemens AG – 05.10.2002
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Appendix 7Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
Siemens AG – 05.10.2002 33 - 36
7 Appendix
7.1 List of figures
Figure 1.0: The 7SN600 transient earth-fault relay............................................................................................ 3
Figure 1.1: Fault currents in the system ............................................................................................................ 7
Figure 1.2: Neutral current and displacement voltage ....................................................................................... 8
Figure 2.1: Detection of transients in the current path..................................................................................... 11
Figure 2.2: Detection of transients and of fundamental wave in the voltage path........................................... 12
Figure 2.4: Evaluation logic for transient fault indication ................................................................................. 14
Figure 2.5: Evaluation logic for continuous earth faults ................................................................................... 15
Figure 2.6: Reset logic ..................................................................................................................................... 16
Figure 2.7: Binary inputs .................................................................................................................................. 17
Figure 2.9: Function test .................................................................................................................................. 18
Figure 3.2: Layout of setting elements (position as delivered) ........................................................................ 20
Figure 3.3: Test setup ...................................................................................................................................... 23
Figure 4.1: Ordering code / MLFB ................................................................................................................... 25
Figure 5.1: Dimensions for panel flush mounting ............................................................................................ 26
Figure 5.2: Dimensions for panel surface mounting (terminals on the side) ................................................... 27
Figure 5.3: Dimensions for panel surface mounting (terminals on up / down) ................................................ 28
Figure 5.4: Front view of relay.......................................................................................................................... 29
Figure 6.1: Connection diagram 7SN600x-0BA00 and 7SN600x-0EA00........................................................ 30
Figure 6.2: Connection diagram 7SN600x-0DA00 .......................................................................................... 31
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Transient earth-fault relay 7SN60 – Instruction Manual Order No. E50417-G1176-C128-A4
34 - 36 Siemens AG – 05.10.2002
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Responsible fortechnical content:Klaus Müller, PTD PA 13Siemens AG, NurembergInternet: www.SIPROTEC.com
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