effective: september 2000 type irv directional overcurrent ... · directional overcurrent relay...

ABB Automation Inc.Substation Automation and Protection DivisionCoral Springs, FL 33065

Instruction Leaflet

Type IRV Directional Overcurrent Relayfor Phase Protection

41-133.3J

Effective: September 2000

Supersedes I.L. 41-133.3H, dated May 1997

( | ) Denotes Changes since previous issue

! CAUTION

Before putting protective relays into service,remove all blocking inserted for the purpose ofsecuring the parts during shipment. Make surethat all moving parts operate freely. Inspect thecontacts to see that they are clean and closeproperly, and operate the relay to check the set-tings and electrical connections.

1.0 APPLICATIONS

These relays are phase directional overcurrent relayswhich are used for the protection of transmissionlines and feeder circuits. Both the time-overcurrentand instantaneous overcurrent units are directionallycontrolled.

2.0 CONSTRUCTION AND OPERATION

The IRV relay consists of : (See Figures 1 & 2, page 2)

This instruction leaflet applies to the following types of relays

Type Time Delay Characteristics

IRV - 2IRV - 5IRV - 6IRV - 7IRV - 8IRV - 9IRV - 11

Short TimeLong TimeDefinite TimeModerately Inverse TimeInverse TimeVery Inverse TimeExtremely Inverse Time

All possible contingencies which may arise durindetails and variations of this equipment do not purinformation is desired by purchaser regarding thisof this equipment, the local ABB Power T&D Com

Printed in U.S.A.

1. a time-overcurrent unit (CO)

2. a directional unit (D)

3. an instantaneous overcurrent unit (I)with a staturating transformer (I-ST)

4. two indicating contactor switches (ICS-I andICS-T)

5. an auxiliary unit (CS-1 or TR-1)

2.1 TIME-OVERCURRENT UNIT (CO)

The electromagnets for the types CO-5, CO-6, CO-7,CO-8 and CO-9 units have a main tapped coil locatedon the center lag of an “E” type laminated structurethat produces a flux which divides and returnsthrough the outer legs. A shading coil causes the fluxthrough the left leg to lag the main pole flux. The out-of-phase fluxes thus produced in the air gap causes acontact closing torque.

The electromagnet for the type CO-2 and CO-11 unitshave a main coil consisting of a tapped primary wind-ing and a secondary winding. Two identical coils onthe outer legs of the lamination structure are con-nected to the main coil secondary in a manner so thatthe combination of all the fluxes produced by theelectromagnet result in out-of-phase fluxes in the airgap. The out-of-phase air gap fluxes produced causea contact closing torque.

2.2 DIRECTIONAL UNIT (D)

The directional unit is a product induction cylindertype unit operating on the interaction between thepolarizing circuit flux and the operating circuit flux.

g installation, operation or maintenance, and allport to be covered by these instructions. If further particular installation, operation or maintenance

pany Inc. representative should be contacted.

41-133.3J

2

Type IRVDirectional Overcurrent Relay

Pho

toP

hoto

Inst

anta

neou

s U

nit T

ap B

lock

R2

Brid

ge

Rec

tifie

r

Inst

anta

neou

s

Dire

ctio

nal

ICS

-I

(CO

)

ICS

-T

Var

isto

rC

1C

apac

itor

C2

Cap

acito

rR

1

Aux

iliar

y

Res

isto

rU

nit (

I)

Uni

t (D

)

Uni

t (T

R-1

)

Tim

e

Uni

tO

verc

urre

nt

(CO

)

Tim

e

Uni

tO

verc

urre

nt

Fig

ure

1.T

ype

IRV

Rel

ay w

ithou

t cas

e (F

ront

Vie

w)

Fig

ure

2.T

ype

IRV

Rel

ay w

ithou

t Cas

e (R

ear

Vie

w)

41-133.3JType IRVDirectional Overcurrent Relay

Mechanically, the directional unit is composed of fourbasic components: A die-cast aluminum frame, anelectromagnet, a moving element assembly, and amolded bridge.

The frame serves as the mounting structure for themagnetic core. The magnetic core which houses thelower pin bearing is secured to the frame by a springand snap ring. This is an adjustable core which has a.025 inch flat on one side and is held in its adjustedposition by the clamping action of two compressedsprings. The bearing can be replaced, if necessary,without having to remove the magnetic core from theframe.

The electromagnet has two series-connected polariz-ing coils mounted diametrically opposite one another;two series-connected operating coils mounted diamet-rically opposite one another; two magnetic adjustingplugs; upper and lower adjusting plug clips; and twolocating pins. The locating pins are used to accuratelyposition the lower pin bearing, which is mounted onthe frame, with respect to the upper pin bearing, whichis threaded into the bridge. The electromagnet issecured to the frame by four mounting screws.

The moving element assembly consists of a spiralspring, contact carrying member, and an aluminumcylinder assembled to a molded hub which holds theshaft. The shaft has removable top and bottom jewelbearings. The shaft rides between the bottom pinbearing and the upper pin bearing with the cylinderrotating in an air gap formed by the electromagnet andthe magnetic core.

The bridge is secured to the electromagnet and frameby two mounting screws. In addition to holding theupper pin bearing, the bridge is used for mounting theadjustable stationary contact housing. The stationarycontact housing is held in position by a spring typeclamp. The spring adjuster is located on the undersideof the bridge and is attached to the moving contactarm by a spiral spring. The spring adjuster is also heldin place by a spring type clamp.

With the contacts closed, the electrical connection ismade through the stationary contact housing clamp, tothe moving contact, through the spiral spring.

2.3 INSTANTANEOUS OVERCURRENT UNIT (I)WITH SATURATING TRANSFORMER (I-ST)

The instantaneous overcurrent unit is similar in con-struction to the directional unit. The time phase rela-tionship of the two air gap fluxes necessary for thedevelopment of torque is achieved by means of acapacitor connected in series with one pair of polewindings.

When the make contact of D closes, it permits the I-unit to operate. It connects capacitor C3 and one pairof I-unit coils across the output voltage of the saturat-ing transformer I-ST. The full-wave bridge in this con-nection and the rectifier in series with the D contactserve to isolate the ac and dc circuits.

The transformer is of the saturating type for limiting theenergy to the instantaneous overcurrent unit at highervalues of fault current and to reduce ct burden. Theprimary winding is tapped and these taps are broughtout to a tap block for ease in changing the pick-up ofthe instantaneous overcurrent unit. The use of atapped transformer provides approximately the sameenergy level at a given multiple of pick-up current forany tap setting, resulting in one time curve throughoutthe range of the relay.

Across the secondary is connected a non-linearresistor known as a varistor. The effect of the varistoris to reduce the voltage peaks applied to the overcur-rent unit and phase shifting capacitor.

2.4 INDICATING CONTACTOR SWITCH UNITS(ICS-I AND ICS-T)

The dc indicating contactor switch is a small clappertype device. A magnetic armature, to which leaf-springmounted contacts are attached, is attracted to themagnetic core upon energization of the switch. Whenthe switch closes the moving contacts bridge two sta-tionary contacts, completing the trip circuit. Also duringthis operation two fingers on the armature deflect aspring located on the front of the switch, which allowsthe operation indicator target to drop. The target isreset from the outside of the case by a push-rodlocated at the bottom of the case.

The front spring, in addition to holding the target, pro-vides restraint for the armature and thus controls thepick-up value of the switch. The ICS unit is commonly

3

41-133.3J Type IRVDirectional Overcurrent Relay

used to provide a seal-in around the main protectiverelay contacts relieving them of carrying heavy dutytrip currents.

2.5 AUXILIARY UNIT (CS-1 OR TR-1)

Older relays manufactured prior to 1988 containedan auxiliary unit which was a plunger type devicedesignated “CS-1”. The CS-1 unit is a solenoid typedc switch. A cylindrical plunger, with a silver discmounted on its lower end moves in the core of thesolenoid. As the plunger travels upward, the discbridges the silver stationary contacts. A tapped resis-tor (R2) is used to enable the use of the auxiliary uniton a 48, 125 or 250 volt dc system (24 volt relayscome with a fixed 100 ohm resistor for R2), (See Fig-ure 14 page 26 for appropriate settings and resis-tance values of R2).

The CS-1 auxiliary unit has been replaced by a tele-phone type relay which is designated “TR-1”. Addi-tional components, mounted on a small printedcircuit board, have also been added as follows:

• A “free-wheeling” diode in parallel with the TR-1coil.

• An (RC) arc suppressing circuit across the nor-mally open “D” contact.

The resistance of the TR-1 coil is 2000 ohms. Atapped resistor (R2) is also used to enable the use ofthe auxiliary unit on a 48, 125 or 250 volt dc system(24 volt relays come with a fixed 500 ohm resistor forR2), (see Figure 14 page 26 for appropriate settingsand resistance values of R2).

The auxiliary unit (TR-1) is a telephone type relaywith two normally open contacts. The operation ofthe auxiliary unit (TR-1) is controlled by the direc-tional unit (D) normally closed contact, which in turndirectionally controls the time-overcurrent unit (CO)as shown in Figure 4, page 17. When sufficientpower flows in the tripping direction to close the nor-mally open D contact, the auxiliary unit operates andbridges the lag coil of the time-overcurrent unit (CO)permitting this unit to operate.

The other contact of the auxiliary unit seals in its coilthrough the break contact of the “I” unit, in order to

4

relieve the make contact of the “D” unit from carryingthe auxiliary unit coil current. The break contact ofthe “D” unit breaks this seal by short circuiting theauxiliary unit coil. The break contact of the “I” unitalso breaks the seal of the auxiliary unit coil to pre-vent tripping on reverse faults where the directionalunit has preclosed on load current.

3.0 CHARACTERISTICS

The time characteristics of the directional over-cur-rent relays are designated by specific numbers asindicated by relay type. (See chart on front cover)

The relays are available in the following currentranges:

Time Overcurrent Unit (CO)

The tap value is the minimum current required to justclose the relay contacts.

The time vs. current characteristics for the time-over-current unit are shown in Figures 5 to 11 (page 18 to24). These characteristics give the contact closingtime for the various time dial settings when the indi-cated multiples of tap value current are applied to therelay.

Instantaneous Overcurrent Unit (I)

The time vs. current characteristics for the instanta-neous overcurrent unit is shown in Figure 12, page25.

Range(Amps)

Taps

0.5 - 2.52 - 6

4 - 12

0.5 0.6 0.8 1.0 1.5 2.0 2.52 2.5 3 3.5 4 5 64 5 6 7 8 10 12

Range(Amps)

Taps

0.5 - 21 - 42 - 84 - 16

10 - 4020 - 80

0.5 0.75 1.0 1.25 1.5 21.0 1.5 2.0 2.5 3.0 4.02 3 4 5 6 84 6 8 9 12 1610 15 20 24 30 4020 30 40 48 60 80


The time vs. current characteristics for the directionalunit is shown in Figure 13, page 25.

3.1 TRIP CIRCUIT

The relay contacts will safely close 30 amps at 250volts dc and the seal-in contacts of the indicatingcontactor switches will safely carry this current longenough to trip a circuit breaker.

The indicating contactor switch has two taps that pro-vide a pickup setting of 0.2 or 2 amps. To changetaps requires connecting the lead located in front ofthe tap block to the desired setting by means of ascrew connection.

3.2 CYLINDER UNIT CONTACTS

The moving contact assembly has been factoryadjusted for low contact bounce performance andshould not be changed.

The set screw in each stationary contact has beenshop adjusted for optimum follow and this adjust-ment should not be disturbed.

3.3 TRIP CIRCUIT CONSTANTS


The auxiliary unit operating time is approximately 5milliseconds.

3.5 DIRECTIONAL UNIT

The IRV relay is intended for phase fault protectionand the directional unit has its maximum torque when

Indicating Contactor Switch Coil Taps

0.2 amps tap2.0 amps tap

6.5 ohms dc resistance0.15 ohms dc resistance

CS-1

48-250 volt dc relay dc resistance – 1165 ohms

24 volt dc relay dc resistance – 100 ohms

TR-1

Coil resistance is 2000 ohms for all dc voltages.

the current leads the voltage by 30° ±10°. The direc-tional unit minimum pickup is 1.2 volts and 4 amps atits maximum torque angle for 4 - 12 amps rangerelays, and 1.2 volts and 2 amps or less for the 0.5 -2.5 amps and the 2 - 6 amps range relays.

The directional unit should be connected using thecurrent in one-phase wire and the potential acrossthe other two phase wires. This connection is com-monly referred to as the 90° connection. When utiliz-ing the 90° connection the maximum torque of therelay occurs when the fault current lags its 100% P.F.position by 60°, ±10°. See Figure 4 (page 17).

4.0 RELAY SETTINGS

! CAUTION

In order to avoid opening current transformer cir-cuits when changing taps under load, start withRED handles FIRST and open all switchblades.Chassis operating shorting switches on the casewill short the secondary of the current trans-former. Taps may then be changed with the relayeither inside or outside the case. Since the tapblock screws carry operating current, be surethat the screws are turned tight. Then reclose allswitchblades making sure the RED handles areclosed LAST.

4.1 TIME OVERCURRENT UNIT (CO)

The time overcurrent unit settings can be definedeither by tap setting and time dial position or by tapsetting and a specific time of operation at some cur-rent multiple of the tap setting (e.g., 4 tap setting, 2time dial position or 4 tap setting, 0.6 seconds at 6times tap value current).

To provide selective circuit breaker operation, a mini-mum coordinating time of 0.3 seconds plus circuitbreaker time is recommended between the relaybeing set and the relays with which coordination is tobe effected.

The connector screws on the plate above the timedial makes connections to various turns on the oper-ating coil. By placing this screw in the various termi-nal plate holes, the relay will respond to multiples of

5


tap value currents in accordance with the various typ-ical time-current curves.

The factory adjustment of the CO unit contact pro-vides a contact follow. Where circuit breaker reclos-ing will be initiated immediately after a trip by the COcontact, the time of the opening of the contactsshould be a minimum. This condition is obtained byloosening the stationary contact mounting screw,removing the contact plate and then replacing theplate with the bent end resting against the contactspring.


No setting is required.

4.3 INSTANTANEOUS OVERCURRENT UNIT (I)WITH SATURATING TRANSFORMER (I-ST)

! CAUTION

In order to avoid opening current transformer cir-cuits when changing taps under load, start withRED handles FIRST and open all switchblades.Chassis operating shorting switches on the casewill short the secondary of the current trans-former. Taps may then be changed with the relayeither inside or outside the case. Since the tapblock screws carry operating current, be surethat the screws are turned tight. Then reclose allswitchblades making sure the RED handles areclosed LAST.

The only setting required is the pickup current settingwhich is made by means of the connector screwlocated on the tap plate. By placing the connectorscrew in the desired tap, the unit will just close itscontacts at the tap value current.

4.4 INDICATING CONTACTOR SWITCH(ICS-I AND ICS-T)

The only setting required on the ICS units is theselection of the 0.2 or 2.0 amps tap setting. Thisselection is made by connecting the lead located infront of the tap block to the desired setting by meansof the connecting screw.

4.5 AUXILIARY UNIT

The only setting required on the auxiliary unit is the

48, 125 or 250 voltage on the tapped resistor (R2).This connection can be made by referring to Figure14, page 26.

5.0 INSTALLATION

The relays should be mounted on switchboard pan-els or their equivalent in a location free from dirt,moisture, excessive vibration and heat. Mount therelay vertically by means of the two mounting studsfor projection mounting or by means of the fourmounting holes on the flange for the semi-flushmounting. Either of the studs or the mounting screwsmay be used for grounding the relay. The electricalconnections may be made directly to the terminals bymeans of screws for steel panel mounting or to termi-nal studs furnished with the relay for thick panelmounting. The terminal studs may be easily removedor inserted by locking two nuts on the studs and thenturning the proper nut with a wrench.

For detail information on the FT Case refer to Instruc-tion Leaflet 41-076.

The external connection of the directional overcur-rent relays is shown in Figure 4, page 17.

6.0 ACCEPTANCE TEST

NOTE:The proper adjustments to insure correct operationof this relay have been made at the factory. Uponreceipt of the relay, no customer adjustments, otherthan those covered under “RELAY SETTINGS”,should be made.

The following check is recommended to insure thatthe relay is in proper working order.


1. Contacts — The index mark on the move-ment frame will coincide with the “O” markon the time dial when the stationary con-tact has moved through approximatelyone-half of its normal deflection. There-fore, with the stationary contact restingagainst the backstop, the index mark is off-set to the right of the “O” mark by approxi-mately .020”. The placement of the varioustime dial positions in line with the indexmark will give operating times as shown on

6


the respective time-current curves.

2. Minimum Trip Current — Set the time dialto position 6 with the auxiliary unit (CS-1 orTR-1) contacts blocked closed (or shortthe CO lag coil with a jumper), alternatelyapply tap value current plus 3% and tapvalue current minus 3%. The moving con-tact should leave the backstop at tap valuecurrent plus 3% and should return to thebackstop at tap value current minus 3%.

3. Time Curve — Table 1 (page 11) showsthe time curve calibration points for thevarious types of relays. With the time dialset to the indicated position, apply the cur-rents specified by Table 1 (e.g., for theIRV-2, 3 and 20 times tap value current)and measure the operating time of therelay. The operating times should equalthose of Table 1 plus or minus 5%.

For type IRV-11 relay only, the 1.30 timestap value operating time from the number6 time dial position is 54.9 ±5% seconds. Itis important that the 1.30 times tap valuecurrent be maintained accurately. Themaintaining of this current accurately isnecessary because of the steepness of theslope of the time-current characteristic(Figure 11, page 24). A 1% variation in the1.30 times tap value current (includingmeasuring instrument deviation) willchange the nominal operating time byapproximately 4%.


1. Contact Gap — The gap between the sta-tionary contact and moving contact withthe relay in the de-energized positionshould be approximately .020”.

2. Sensitivity — The directional unit shouldtrip with 1.2 volts and 4 amps at its maxi-mum torque angle (current leading thevoltage by 30°) for the 4 - 12 amps rangerelays and 1.2 volts and 2 amps for the0.5 - 2.5 amps and the 2 - 6 amps rangerelays.

3. Spurious Torque Adjustments — Thereshould be no spurious closing torques

when the operating circuits are energizedper Table 2 (page 11) with the polarizingcircuit and CO coil short circuited.

6.3 INSTANTANEOUS OVERCURRENT UNIT (I) WITH SATURATING TRANSFORMER (I-ST)

1. Contact Gap — The gap between the sta-tionary and moving contacts with the relayin the de-energized position should beapproximately .020”.

2. Minimum Trip Current (Pickup) — Thedirectional unit (D) contacts should beblocked closed when checking the pickupof the instantaneous overcurrent unit.

3. The pickup of the instantaneous overcur-rent unit can be checked by inserting thetap screw into the desired tap hole andapplying rated tap value current. The con-tact should close within ± 5% of tap valuecurrent.

6.4 INDICATING CONTACTOR SWITCHES (ICS-I AND ICS-T)

1. Close the contacts of the CO and thedirectional unit (D) and pass sufficient dccurrent through the trip circuit to close thecontacts of (ICS-T). This value of currentshould not be greater than the particular(ICS-T) tap setting being used. The opera-tion indicator target should drop freely,bringing the letter “T” into view.

2. Close the contacts of the instantaneousover-current unit (I) and the directional unit(D). Pass sufficient dc current through thetrip circuit to close the contacts of (ICS-I).This value of current should not be greaterthan the particular (ICS-I) tap setting beingused. The operation indicator target shoulddrop freely, bringing the letter “I” into view.

6.5 AUXILIARY UNIT (CS-1, TR-1)

Verify the R2 resistor tap is set to the appropriatecontrol voltage (See “RELAY SETTINGS”).

7.0 ROUTINE MAINTENANCE

All relays should be inspected and checked periodi-cally to assure proper operation. Generally a visualinspection should call attention to any noticeablechanges. A minimum suggested check on the relay

7


system is to close the contacts manually to assurethat the breaker trips and the target drops. Thenrelease the contacts and observe that the reset issmooth and positive.

If an additional time check is desired, pass second-ary current through the relay and check the time ofoperation. It is preferable to make this at severaltimes pickup current at an expected operating pointfor the particular application. For the 0.5 - 2.5 ampsrange CO-5 and CO-6 induction unit use the alterna-tive test circuit in Figure 15 (page 27) as these relaysare affected by a distorted wave form. With this con-nection the 25/5 amps current transformers shouldbe worked well below the knee of the saturation (i.e.,use 10L50 or better).

All contacts should be periodically cleaned. A contactburnisher Style 182A836H01 is recommended forthis purpose. The use of abrasive material for clean-ing contacts is not recommended, because of thedanger of embedding small particles in the face ofthe soft silver and thus impairing the contact.

8.0 CALIBRATION

Use the following procedure for calibrating the relay ifthe relay has been taken apart for repairs or theadjustments have been disturbed. This procedureshould not be used unless it is apparent that the relayis not in proper working order. (See “ACCEPTANCETEST”).


1. Contacts — The index mark on the move-ment frame will coincide with the “O” markon the time dial when the stationary con-tact has moved through approximatelyone-half of its normal deflection. There-fore, with the stationary contact restingagainst the backstop, the index mark is off-set to the right of the “O” mark by approxi-mately .020”. The placement of the varioustime dial positions in line with the indexmark will give operating times as shown onthe respective time-current curves.

2. Minimum Trip Current — The adjustmentof the spring tension in setting the mini-mum trip current value of the relay is mostconveniently made with the damping mag-net removed.

With the time dial set on “O”, wind up thespiral spring by means of the springadjuster until approximately 6-3/4 convolu-tions show.

Set the relay on the minimum tap setting,the time dial to position 6.

With the auxiliary unit (CS-1 or TR-1) con-tacts blocked closed, adjust the controlspring tension so that the moving contactwill leave the backstop at tap value current+1.0% and will return to the backstop attap value current -1.0%.

3. Time Curve Calibration — Install the per-manent magnet.

Apply the indicated current per Table 1 forpermanent magnet adjustment (e.g., IRV-8, 2 times tap value) and measure theoperating time. Adjust the permanent mag-net keeper until the operating time corre-sponds to the value of Table 1.

For type IRV-11 relay only, the 1.30 timestap value operating time from the number6 time dial position is 54.9 ±5% seconds. Itis important that the 1.30 times tap valuecurrent be maintained accurately. Themaintaining of this current accurately isnecessary because of the steepness of theslope of the time-current characteristic(Figure 11, page 24). A 1% variation in the1.30 times tap value current (includingmeasuring instrument deviation) willchange the nominal operating time byapproximately 4%. If the operating time at1.3 times tap value is not within these lim-its, a minor adjustment of the controlspring will give the correct operating timewithout any undue effect on the minimumpickup of the relay. This check is to bemade after the 2 times tap value adjust-ment has been completed.

Apply the indicated current per Table 1 forthe electromagnet plug adjustment (e.g.,IRV-8, 20 times tap value) and measurethe operating time. Adjust the proper pluguntil the operating time corresponds to thevalue in Table 1. (Withdrawing the lefthand plug, front view, increases theoperating time and withdrawing the

8


right hand plug, front view, decreasesthe time.) In adjusting the plugs, one plugshould be screwed in completely and theother plug run in or out until the properoperating time has been obtained.

Recheck the permanent magnet adjust-ment. If the operating time for this calibra-tion point has changed, readjust thepermanent magnet and then recheck theelectromagnet plug adjustment.


The directional unit is the lower cylinder unit.

1. The upper bearing screw should bescrewed down until there is approximately.025” clearance between it and the top ofthe shaft bearing. The upper pin bearingshould then be securely locked in positionwith the lock nut.

2. Contact gap adjustment for the directionalunit is made with the moving contact in thereset position, i.e., against the right side ofthe bridge. Advance the right hand station-ary contact until the contacts just close.Then advance the stationary contact anadditional one-half turn.

Now move in the left-hand stationary con-tact until it just touches the moving contact.Then back off the stationary contact 2/3 ofone turn for a contact gap of .020”. Theclamp holding the stationary contact hous-ing need not be loosened for the adjust-ment since the clamp utilizes a spring-typeaction in holding the stationary contact inposition.

3. Insert tap screw of overcurrent unit in high-est tap. The sensitivity adjustment is madeby varying the tension of the spiral springattached to the moving element assembly.The spring is adjusted by placing a screw-driver or similar tool into one of the notcheslocated on the periphery of the springadjuster and rotating it. The spring adjusteris located on the underside of the bridgeand is held in place by a spring type clampthat does not have to be loosened prior tomaking the necessary adjustments.

The spring is to be adjusted such that thecontact will close as indicated by a neonlamp in the contact circuit when energizedwith 1.2 volts and 4 amps (current leading30°) for the 4 - 12 amps range relays and1.2 volts and 2 amps for the 0.5 - 2.5 and2 - 6 amps range relays. This can be doneapproximately using current in phase withvoltage by increasing the pickup current to4.6 and 2.3 amps respectively.

4. The magnetic plugs and core are used toreverse any unwanted spurious torquesthat may be present when the relay isenergized respectively on current or volt-age alone.

The reversing of the spurious torques isaccomplished by using the adjusting plugsand core in the following manner:†

Apply 120 Vac 60 Hz to terminals 6 and 7,relay contacts should stay open. If the con-tacts are closed rotate core by means ofadjustor located on the bottom side of thecylinder unit until contacts stay open. Thecore assembly is held in position by theclamping action of two compressedsprings. This allows its position to bechanged by inserting a non-magnetic toolinto the slot on the bottom side of the unit.

Short circuit both the voltage terminals andCO coil. Apply current to the operating cir-cuit terminals as per Table 2 (page 11).

Plug adjustment is then made per Table 2such that the spurious torques arereversed. The plugs are held in position byupper and lower plug clips. These clipsneed not be disturbed in any manner whenmaking the necessary adjustment.

The magnetic plug adjustment may beused to positively close the contacts oncurrent alone. This may be desired onsome installations in order to insure thatthe relay will always trip the breaker onzero potential.

† Plugs should be at “fully screwed in” position prior to

adjustment of core.

9


8.3 INSTANTANEOUS OVERCURRENT UNIT (I) WITH SATURATING TRANSFORMER (I-ST)

1. The upper pin bearing should be screweddown until there is approximately 0.025”clearance between it and the top of shaftbearing. The upper pin bearing should thenbe securely locked in position with the locknut. The lower bearing position is fixed andcannot be adjusted.

2. The contact gap adjustment for the overcur-rent unit is made with the moving contact inthe reset position, i.e., against the right sideof the bridge.

Move in the left-hand stationary contact untilit just touches the moving contact. Thenback off the stationary contact 2/3 of oneturn for a gap of approximately .020”. Theclamp holding the stationary contact hous-ing need not be loosened for the adjustmentsince the clamp utilizes a spring-type actionin holding the stationary contact in position.

3. The sensitivity adjustment is made by vary-ing the tension of the spiral spring attachedto the moving element assembly. The springis adjusted by placing a screwdriver or simi-lar tool into one of the notches located onthe periphery of the spring adjuster androtating it. The spring adjuster is located onthe underside of the bridge and is held inplace by a spring type clamp that does nothave to be loosened prior to making thenecessary adjustments.

Before applying current, block close thecontacts of the D unit. Insert the tap screw inthe minimum value tap setting and adjustthe spring such that the contacts will closeas indicated by a neon lamp in the contactcircuit when energized with the required cur-rent. The pickup of the overcurrent unit withthe tap screw in any other tap should bewithin ± 5% of tap value.

If adjustment of pickup current between tapsettings is desired, insert the tap screw inthe next lowest tap setting and adjust thespring as described. It should be noted thatthis adjustment results in a slightly differenttime characteristic curve and burden.

8.4 INDICATING CONTACTOR SWITCHES (ICS-I AND ICS-T)

1. Adjust the contact gap for approximately0.047”. For proper contact adjustment,insert a .030” feeler gauge between the corepin and the armature. Hold the armatureclosed against the core pin and gauge.Adjust the stationary contacts such that theyjust make with the moving contact. Both sta-tionary contacts should make at approxi-mately the same time. The contact followwill be approximately 1/64” to 3/64”.

2. Close the contacts of the CO and the direc-tional unit and pass sufficient dc currentthrough the trip circuit to close the contactsof the (ICS-T). This value of current shouldnot be greater than the particular (ICS-T)tap setting being used. The operation indi-cator target should drop freely, bringing theletter “T” into view.

3. Close contacts of instantaneous overcurrentunit (I) and directional unit (D). Pass suffi-cient dc current through the trip circuit toclose contacts of the (ICS-I). This value ofcurrent should not be greater than the par-ticular (ICS-I) tap setting being used. Theoperation indicator target should drop freelybringing the letter “I” into view.


1. CS-1 – Adjust the stationary core of the CS-1 for a clearance between the stationarycore and the moving core when the switch ispicked up. This can be done by turning therelay upside-down. Then screw up the corescrew until the moving core starts rotating.Now back off the core screw until the mov-ing core stops rotating. This indicates thepoints when the play in the assembly istaken up, and where the moving core justseparates from the stationary core screw.Back off the core screw approximately oneturn and lock in place. This prevents themoving core from striking and sticking to thestationary core because of residual magne-tism. Adjust the contact clearance for 3/64” bymeans of the two small nuts on either side ofthe Micarta disc.

10


2. TR-1 – No adjustments or calibrations arerequired for the auxiliary unit (TR-1).

3. Connect lead (A) to proper resistor termi-nal per Figure 14, page 26. Block direc-tional unit (D) contacts closed andenergize trip circuit with rated voltage.Contacts of auxiliary unit should make, thisis indicated by a neon lamp in the contactcircuit.

9.0 RENEWAL PARTSRepair work can be done most satisfactorily at thefactory. However, interchangeable parts can be fur-nished to the customers who are equipped for doingrepair work. When ordering parts, always give thecomplete nameplate data.

11

Table 1:

TIME CURVE CALIBRATION DATA — 60 HERTZ

PERMANENT MAGNET ADJUST. ELECTROMAGNET PLUGS

TIME-OVERCURRENT

UNIT TYPE

TIMEDIAL

POSITION

CURRENT(MULTIPLES OF

TAP VALUE)

OPERATINGTIME

SECONDS

CURRENT(MULTIPLES OF

TAP VALUE)

OPERATINGTIME

SECONDS

256789

1111

66666666

3222222

1.3

0.5737.80

2.464.27

13.358.87

11.2754.9

20102020202020

0.2214.30

1.191.111.110.650.24

Table 2:

DIRECTIONAL UNIT CALIBRATION †

† Short circuit the voltage polarizing circuit at the relay terminals before making the above adjustments

Relay Rating Current Adjust Adjustment

0.5 to 2.5 ampsand 2-6 amps

40 amps

MagneticPlugs

If spurious torque is in the contact closing direc-tion (left front view) screw out right magnetic plug until direction of spurious torque is reversed.

If spurious torque is in the contact opening direc-tion, screw out left plug until spurious torque is slight contact opening. Recheck at 40, 25 and 10 amps for the lower range units and 80, 50 and 20 amps for the 4-12 amps range relays.

4-12 80 amps

41-133.3J

12


ENERGY REQUIREMENTS

Instantaneous Overcurrent Unit Operating Current Circuit — 60 Hertz

AmpereRange Tap

ContinuousRating(amps)

One SecondRating

(amps)†

† Thermal Capacities For Short Times Other Than One Second May Be Calculated On The Basis Of Time BeingInversely Proportional To The Square Of The Current.

VA at Tap

Value††

PowerFactor Angle‡

‡ Degrees current lags voltage at tap value current.

VA at 5 Amps.††

†† Voltages taken with High Impedance Type voltmeter

PowerFactorAngle‡

.5 - 2

0.50.751.01.251.52.0

555555

100100100100100100

.37

.38

.39

.41

.43

.45

393635343230

24138.56.04.62.9

463734323128

1 - 4

1.01.52.02.53.04.0

888888

140140140140140140

.41

.44

.47

.50

.53

.59

443230282624

9.05.03.02.11.5

0.93

363229272624

2 - 8

2.03.04.05.06.08.0

888888

140140140140140140

1.11.21.31.41.51.8

494338353329

6.53.32.11.41.10.7

484237353329

4 - 16

4.06.08.09.0

12.016.0

101010101010

200200200200200200

1.51.71.81.92.22.5

514540383430

2.41.20.70.6.37.24

514540383431

10 - 40

10.015.020.024.030.040.0

101010101010

200200200200200200

1.72.43.13.64.24.9

282116151211

0.430.270.200.150.110.08

282117151312

20 - 80

20.030.040.048.060.080.0

101010101010

200200200200200200

6.69.312.013.515.919.2

312420181615

0.040.250.180.140.100.07

312420181615

41-133.3J

13


ENERGY REQUIREMENTSs

Type IRV-2 Time Overcurrent Unit

AmpereRange Tap


One SecondRating†

(amps)

† Thermal capacities for short times other than one second may be calculated on the basis of time being inversely proportional tothe square of the current.

PowerFactorAngle‡


Volt amps††

†† Voltages taken with High Impedance type voltmeter.

AtTap

ValueCurrent

At 3Times

Tap ValueCurrent

At 10 TimesTap Value

Current

At 20 Times Tap Value

Current

0.5/2.5

0.50.60.81.01.52.02.5

0.910.961.181.371.952.242.50

28282828282828

58575350403629

4.84.95.05.36.27.27.9

39.639.842.745.454.465.473.6

256270308348435580700

790851

10241220174022802850

2/6

2.02.53.03.54.05.06.0

3.14.04.44.85.25.66.0

110110110110110110110

59555147454137

5.045.135.375.535.725.906.54

38.739.842.842.846.050.

54.9

262280312329360420474

80092010081120121615001800

4/12

4.05.06.07.08.0

10.012.0

7.38.08.89.610.411.212.0

230230230230230230230

65504746433734

4.925.205.345.355.866.6

7.00

39.142.044.145.849.955.562.3

268305330364400470528

848102011281260140817202064

Type IRV-5 — IRV-6 Time Overcurrent Units

AmpereRange Tap


One SecondRating†

(amps)

PowerFactorAngle‡

Volt amp††

AtTap

ValueCurrent

At 3Times

Tap ValueCurrent


Current


Current

0.5/2.5

.5

.6

.81.01.52.02.5

2.73.13.74.15.76.87.7

88888888888888

69686766626058

3.923.963.964.074.194.304.37

20.620.72121.423.224.926.2

103106114122147168180

270288325360462548630

2/6

22.533.5456

88.89.710.411.212.513.7

230230230230230230230

67666463625957

3.883.873.934.094.084.204.38

2121.622.123.123.524.826.5

110118126136144162183

308342381417448540624

4/12

456781012

1618.819.320.822.52528

460460460460460460460

65636159565347

4.004.154.324.274.404.604.92

22.423.725.326.427.830.135.6

126143162183204247288

3764505316116998801056

41-133.3J

14


ENERGY REQUIREMENTS

Type IRV-7 Time Overcurrent Units

AmpereRange Tap


One SecondRating†

(amps)


PowerFactorAngle‡


Volt amps††

AtTap

ValueCurrent

At 3Times

Tap ValueCurrent


Current


Current

0.5/2.5

0.50.60.81.01.52.02.5

2.73.13.74.15.76.87.7

88888888888888

68676664615856

3.883.933.934.004.084.244.38

20.720.921.121.622.924.825.9

103107114122148174185

278288320256459552640

2/6

22.533.5456

88.89.710.411.212.513.7

230230230230230230230

66636362615958

4.064.074.144.344.344.404.62

21.321.822.523.423.825.227

111120129141149163183

306342366413448530624

4/12

456781012

1618.819.320.822.52528

460460460460460460460

64616058555146

4.244.304.624.694.805.205.40

22.824.225.927.329.83337.5

129149168187211260308

392460540626688860

1032

IRV-8 — IRV-9 Time Overcurrent Units

AmpereRange Tap


One SecondRating†

(amps)

PowerFactorAngle‡

Volt amps††

AtTap

ValueCurrent

At 3Times

Tap ValueCurrent


Current


Current

.05/2.5

.5

.6

.81.01.52.02.5

2.73.13.74.15.76.87.7

88888888888888

72716967625753

2.382.382.402.422.512.652.74

212121.121.22223.524.8

132134142150170200228

350365400440530675800

2/6

22.533.5456

88.89.710.411.212.513.7

230230230230230230230

70666462605856

2.382.402.422.482.532.642.75

2121.121.52222.72425.2

136142149157164180198

360395430470500580660

4/12

456781012

1618.819.320.822.52528

460460460460460460460

68636057544845

2.382.462.542.622.733.003.46

21.321.822.623.624.827.831.4

146158172190207248292

420480550620700850

1020


41-133.3J

15


ENERGY REQUIREMENTS

DIRECTIONAL UNIT POLARIZING CIRCUIT BURDEN

The burden at 120V, 60 cycles, is 12.5 volt-amps at 15 degrees. (Current leading voltage).

Type IRV-11 Time Overcurrent Units

AmpereRange Tap


One SecondRating†

(amps)


PowerFactorAngle‡


Volt amps††


AtTap

ValueCurrent

At 3Times

Tap ValueCurrent

At 10Times

Tap ValueCurrent

At 20 Times

Tap Value Current

0.5/2.5

0.50.60.81.01.52.02.5

1.71.92.23.53.03.53.8

56565656565656

36343027221716

0.720.750.810.891.131.301.48

6.546.87.468.3010.0411.9513.95

71.875.084.093.1115.5136.3160.0

250267298330411502610

2/6

2.02.53.03.54.05.06.0

7.07.88.39.010.011.012.0

230230230230230230230

32302724232020

0.730.780.830.880.961.071.23

6.307.007.748.209.129.8011.34

74.078.584.089.0102.0109.0129.0

264285309340372430504

4/12

4.05.06.07.08.010.012.0

14161718202226

460460460460460460460

29252220181716

0.790.891.021.101.231.321.80

7.088.009.1810.0011.114.916.3

78.490.0101.4110.0124.8131.6180.0

296340378454480600720

ENERGY REQUIREMENTS Directional Unit Operating Circuit Burden– 60 Hertz

AmpereRange


One SecondRating†

(amps)


PowerFactorAngle‡


Volt amps††

†† Voltages Taken With High Impedance Type Voltmeter.

AtMinimumTap Value

Current

At 3 TimesMinimumTap Value

Current


Current


Current

0.5 - 2.5 10 230 34.5 0.03 0.23 2.8 11.5

2 - 6 10 230 34.5 0.44 4.08 48.0 182.0

4 - 12 12 280 28.5 0.48 4.62 53.6 216.0


*Sub 11185A421

Figure 3. Internal Schematic of the Type IRV Relay in the Type FT-31 Case

16


*Sub

629

0B74

7

Fig

ure

4.E

xter

nal S

chem

atic

of t

he IR

V R

elay

for

Pha

se P

rote

ctio

n an

d th

e IR

D R

elay

for

Gro

und

Pro

tect

ion

17


*Sub 1619584

Figure 5. Typical Time Curves of the Time-Overcurrent Unit Short Time (CO-2) Relays.

18


*Sub 3418245

Figure 6. Typical time Curve of the Time-Overcurrent Unit Long Time (CO-5) Relays

19


*Sub 4418246

Figure 7. Typical Time Curve of the Time-Overcurrent Unit Definite Time (CO-6) Relays

20


*Sub 4418247

Figure 8. Typical Time Curve of the Time-Overcurrent Unit Moderately Inverse (CO-7) Relays.

21


*Sub 5418248

Figure 9. Typical Time curve of the Time-Overcurrent Unit Inverse (CO-8) Relays

22


*Sub 3418249

Figure 10. Typical Time Curve of the Time-Overcurrent Unit Very Inverse (CO-9) Relays

23


Sub 2288B655

Figure 11. Typical Time Curve of the Time-Overcurrent Unit Extremely Inverse (CO-11) Relays

24


*Sub 2184A946

Figure 12. Typical Time Curve of the Instantaneous Overcurrent Unit.

*Sub 2184A947

Figure 13. Typical Time Curve of the Directional Unit

25


* Sub 19672A85

Figure 14. Selection of Proper Voltage Tap for auxiliary unit(CS-1 or TR-1) Operation

26


*Sub 7184A948

Figure 15. Diagram of Test Connections of the Time-overcurrent Unit

27

Printed in U.S.A.

ABB Automation4300 Coral Ridge D

Coral Springs Florida 33

TEL: 954-752-6

FAX: 954-345-5

��

visit our website at www.abbus.com/papd


*Sub

17

57D

7902

Fig

ure

16.

Out

line

and

Dril

ling

Pla

n fo

r th

e T

ype

IRV

Rel

ay in

the

Typ

e F

T31

Cas

e

Inc.rive065

700

329

effective: september 2000 type irv directional overcurrent ... · directional overcurrent relay...

Documents