protection mvt 171 - 3.imimg.com · stator earth fault protection a common method of grounding an...
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NumericalNeutral DisplacementProtection
Cutout DetailsMVT 171 is a neutral displacement protection unit, comprising
two elements, namely element 1 & element 2, there by offering
two stages of protection. Element 1, the first stage of protection
is provided with Definite Time Lag (DTL). Element 2 has DTL or
numerous IDMTL curves. One of the elements can also be put
off, when it is not necessary.
Stator Earth Fault ProtectionA common method of grounding an AC generator is to connect
a distribution transformer between the neutral of the generator
and the station ground. The distribution transformer’s primary
voltage rating is equal to, or greater than, the generator’s rated
line-to-neutral voltage. The secondary is rated for 110V or
230V AC. A resistor is connected across the secondary, which
offers (square times the turns ratio of the transformer of its
value) high resistance on the primary side. This reduces the
ground fault current to great extent.
A ground fault on the generator terminal will result in rated line-
to-neutral voltage across the transformer primary where as the
ground fault near the neutral results in low voltage. The MVT
171 relay, which is connected across the secondary resistor,
will sense this voltage and operates. The setting point of this
relay must be higher than the neutral voltage results due to
normal unbalance in order to avoid nuisance trips. This will
allow certain percentage of the stator winding near the neutral
to go unprotected. For example 95% of the stator windings will
be protected, if 5% of the voltage is set (5.5V setting on the
relay for 110V AC PT supply) in the relay. (A minimum setting
possible in MVT 171 relay is 0.5V and the relay is 0.5V and the
relay is rated for 440V AC continuously)
Capacitor Bank ProtectionFor star with isolated neutral or delta connected capacitor bank,
the relay MVT 171 can be connected across the open delta
winding of the three phase PTs, the primary of which is connected
across each phase capacitor string. Alternatively for star
connected capacitor bank the relay can be connected across the
secondary of the transformer connected across the neutral of
the capacitor bank and ground. For grounded star connected
capacitor banks the MVT 171 is connected across the open
delta winding of PTs, primary of which are connected to the
uniformly tapped points of the bank and the ground.
For balanced condition no voltage will appear across the relay.
But operation of a unit fuse will cause the neutral point to be
Ordering Information
• Auxiliary supply range
Description
Numerical Neutral Displacement Protection Relay - MVT 171
MVT 171
Qualification
ISO 9001 - 2000
PART CASE CUT OUT BEZEL
A B C D
01 2/3V 149.5 148 170 170
Note:
1. All dimensions are in mm
2. All dimensions are measured equidistant from centre line
3. Maximum depth of equipment inside panel : 200mm
The policy of Easun Reyrolle is one of continuous improvement and development. The company therefore reserves the right to supply equipment,
which may differ slightly from that described and illustrated in this publication.
displaced and the voltage will appear across the relay and its
value will depend on the number of units in the capacitor bank.
In line with usual practice, operation of a single unit fuse will
impose a voltage increase of less than 1.1 times nominal design
voltage across the remaining parallel units. Hence the MVT 171
relay will provide an initial alarm function followed by a trip
operation if any further fuses in the same group operates.
Undergrounded System ProtectionAn earth fault occuring on the feeder feeding to an unearthed
transformer should be cleared by the feeder circuit breaker, but
if there is a back feeding from the unearthed transformer side,
the feeder may be maintained alive. The feeder then is a local
unearthed system, which results in arcing ground and dangerous
over voltages may occur. This condition is detected by measuring
the residual voltage on the feeder.
A MVT171 relay, which is connected across the open-delta
connected secondary winding of the PTs connected to the feeder,
will sense this displaced neutral voltage and operates. To obtain
discrimination with the protection elsewhere on the system,
appropriate inverse and voltage settings are to be chosen.
Genesis Range
FACT
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Sales OfficesBangaloreEasun Reyrolle Ltd.#17/3 Arakere, Bannerghatta Road,Bangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
BhopalEasun Reyrolle Ltd.H.No.16, Essarjee HomesNear Gopal Nagar, Kalan RoadPiplani, Bhopal - 462 021, India.Telefax: +91 755 2684221Email: [email protected]
ChennaiEasun Reyrolle Ltd.6th Floor, Temple Tower, 672,Anna Salai, NandanamChennai - 600 035, India.Tel: +91 44 24346425/24347608Fax: +91 44 24346435Email: [email protected]
DelhiEasun Reyrolle Ltd.29/12, Ground Floor, East Patel NagarNew Delhi - 110 008, India.Tel: +91 11 25747321/25747322Fax: +91 11 25747320Email: [email protected]
KolkataEasun Reyrolle Ltd.4, Dr.Sundari Mohan Avenue, 5th FloorFlat No.18, Kolkata - 700 014, India.Tel: +91 33 22848320Fax: +91 33 22848326Email: [email protected]
MumbaiEasun Reyrolle Ltd.23, Kasturi Building, Jamshedji Tata RoadMumbai - 400 020, India.Tel: +91 22 22022270/22855415Fax: +91 22 22825703Email: [email protected]
SecunderabadEasun Reyrolle Ltd.#2, 1st Floor, Paradise ChambersOpp Hotel Ambassador1-7-196 Prender Ghast RoadSecunderabad - 500 003, India.Telefax: +91 40 27817847Email: [email protected]
CORPORATE OFFICEEasun Reyrolle Limited.,98 Sipcot Industrial ComplexHosur 635 126, India.Tel: +91 4344 401600/01/02Fax: +91 4344 276397
TURNKEY PROJECTSBUSINESS/AMR BUSINESS#389, “Rasukumaki”, HulimavuBegur Hobli, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 40477200/ 201Fax: +91 80 40477202Email: [email protected]
HOSUR WORKS#98, Sipcot Industrial ComplexHosur - 635 126, India.Tel: +91 4344 401600/01/02Fax: +91 4344 276397
CENTRAL MARKETING &EXPORTS BUSINESS#17/3 ArakereBannerghatta RoadBangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
BANGALORE WORKS#17/3 Arakere, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
AUTOMATION BUSINESS#389, “Rasukumaki”, HulimavuBegur Hobli, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 40477200/ 201Fax: +91 80 40477202Email: [email protected]
Corporate OfficeEasun Reyrolle Limited. 98 Sipcot Industrial Complex,
Hosur 635 126 India.Tel: +91 4344 401600/01/02
Fax: +91 4344 276397www.easunreyrolle.com
Technical InformationWiring Diagram
Voltage Input Rating 63.5/110/230V AC
Frequency 50 Hz
Auxiliary SupplyNominal voltage Voltage range
24/30/48/110V DC 18-135 V DC
48/110/220V DC 43-280 V DC
or 110VAC
SettingsElement 1 0.5V to 25V in steps of 0.5V
Element 2 0.5V to 25V in steps of 0.5V
Time multiplier 0.025 to 1.0 in steps of 0.025
(for all inverse characteristics)
Time setting 0 to 20 sec in steps of 0.01sec
(if DTL is selected)
Operating CharacteristicsElement 1 Definite Time Lag (DTL)
Element 2 Standard Inverse 3 sec (SI3)
Standard Inverse 1.3 sec (SI1)
Very Inverse (VI)
Extremely Inverse (EI)
Long Time Inverse (LTI) or
Definite Time Lag (DTL)
DTL Operating Time 0 to 20.00 sec in steps of 0.01sec
IDMTL Operating Time can be calculated as follows
Where V - Fault voltage
Vs - Settings voltage
Tm - Time multiplier setting
Sl 3 k = 0.14 α = 0.02
Sl 1 k = 0.0613 α = 0.02
Vl k = 13.5 α = 1.0
El k = 80.0 α = 2.0
LTl k = 120.0 α = 1.0
Output ContactsThe relay has 6 output contacts
Element 1trip/alarm relay 2 N/O
Common starter 1 C/O
Element 2 alarm 1 N/O
Element 2 trip 1 N/O
Protection unhealthy 1 N/C
Contact RatingCarry continuously 5A AC rms or DC
Make & carry 20A for 0.2 sec
Break 50W DC with a max.
of 300V or 5A DC
L/R<0.04 sec
Burden
AC Burden< 0.015 VA at 63.5 V
< 0.035 VA at 110 V
< 0.150 VA at 230 V
DC BurdenDC (Quiescent) 5W
EnvironmentalTemperature IEC 60068-2-1/2
Operating range -10° C to +55° CStorage Range -25° C to +70° C
Humidity IEC 60068-2-3
4 days at 40° C & 93% RH
Transient Overvoltage IEC 60255-5
5 KV, 1.2/50µs, 0.5J between all terminals and earth orbetween any two terminals without damage or flashover.
Insulation IEC 60255-5
2.0 KVrms for 1 min between all terminals and earth2.0 KVrms for 1 min between independent circuits1.0 KVrms for 1 min across normally open contacts
High Frequency IEC 60255-22-1 class lll
Disturbance2.5KV Common (Longitudinal) mode1.0 KV Series (Transverse) mode
Electrostatic IEC 60255-22-2 class lll
Discharge6 KV Contact discharge8 KV Air discharge
Radio Frequency IEC 60255-22-3 class lll
Interference20 MHz to 1000 MHz, 10V/m
Fast Transient IEC 60255-22-4 class lV
4 KV, 5/50 ns, 2.5 KHz repetitive
Vibration (Sinusoidal) IEC 60255-21-1 class l
Shock & Bump IEC 60255-21-2 class l
t operate = x Tmk
VsV –1[ ]
α
In many applications of this relay, the third harmonic component
predominates in the residual voltage under normal conditions.
Since low setting is adopted in the relay it should not
unnecessarily sense the harmonic voltages. The type MVT 171
relay operates only for fundamental frequency and rejects all
harmonic voltages.
Design
The MVT 171 Protection unit consists of the following modules
within it’s compact dimensions.
• Input Module
• Power Supply and Output Relay module
• Measuring Module
• Front Fascia
The three modules viz. Input, Power supply and Measuring
modules are plugged into the Front fascia which house switches,
LEDs and LED display for the human machine interface. All PCBs
are well protected from one another and from external
environment with best shielding for better electromagnetic
compatibility and housed in the enclosed chassis, which is with
drawable from the outer case.
This relay has independent power supply provided with galvanic
isolation. The relay is suitable for wide range of auxiliary input
supply.
The reduced output from the voltage transformer is sampled at
the rate of 16 samples per cycle and digitized by means of
analog to digital converter. The digitized signals are processed
numerically by means of micro controller. The harmonics are
filtered in digital filter and the relay operates only for the
fundamental.
Applications
• Capacitor bank
• Ungrounded/High impedance earthed systems
• AC Generators
Features
Protection• Unbalance voltage (47)
• System earth fault
• Stator earth fault/Neutral over voltage (59N)
• Dual protection stages
• Both IDMTL & DTL curve characteristics available
• Numerical, fundamental measurement
• Highly immune to harmonics
• Dual protection stages
Control• The relay has 6 output contacts
• Element 1trip/alarm relay 2 N/O
• Common starter 1 C/O
• Element 2 alarm 1 N/O
• Element 2 trip 1 N/O
• Protection unhealthy 1 N/C
Monitoring• Self-monitoring via watchdog timer
User Interface• Seven segment LED display
• LED indications
• Sealable front cover to prevent unauthorised access
Other Features
• Drawout modular case
• Non-volatile memory for trip indication
• Wide range of auxiliary supply
Technical InformationWiring Diagram
Voltage Input Rating 63.5/110/230V AC
Frequency 50 Hz
Auxiliary SupplyNominal voltage Voltage range
24/30/48/110V DC 18-135 V DC
48/110/220V DC 43-280 V DC
or 110VAC
SettingsElement 1 0.5V to 25V in steps of 0.5V
Element 2 0.5V to 25V in steps of 0.5V
Time multiplier 0.025 to 1.0 in steps of 0.025
(for all inverse characteristics)
Time setting 0 to 20 sec in steps of 0.01sec
(if DTL is selected)
Operating CharacteristicsElement 1 Definite Time Lag (DTL)
Element 2 Standard Inverse 3 sec (SI3)
Standard Inverse 1.3 sec (SI1)
Very Inverse (VI)
Extremely Inverse (EI)
Long Time Inverse (LTI) or
Definite Time Lag (DTL)
DTL Operating Time 0 to 20.00 sec in steps of 0.01sec
IDMTL Operating Time can be calculated as follows
Where V - Fault voltage
Vs - Settings voltage
Tm - Time multiplier setting
Sl 3 k = 0.14 α = 0.02
Sl 1 k = 0.0613 α = 0.02
Vl k = 13.5 α = 1.0
El k = 80.0 α = 2.0
LTl k = 120.0 α = 1.0
Output ContactsThe relay has 6 output contacts
Element 1trip/alarm relay 2 N/O
Common starter 1 C/O
Element 2 alarm 1 N/O
Element 2 trip 1 N/O
Protection unhealthy 1 N/C
Contact RatingCarry continuously 5A AC rms or DC
Make & carry 20A for 0.2 sec
Break 50W DC with a max.
of 300V or 5A DC
L/R<0.04 sec
Burden
AC Burden< 0.015 VA at 63.5 V
< 0.035 VA at 110 V
< 0.150 VA at 230 V
DC BurdenDC (Quiescent) 5W
EnvironmentalTemperature IEC 60068-2-1/2
Operating range -10° C to +55° CStorage Range -25° C to +70° C
Humidity IEC 60068-2-3
4 days at 40° C & 93% RH
Transient Overvoltage IEC 60255-5
5 KV, 1.2/50µs, 0.5J between all terminals and earth orbetween any two terminals without damage or flashover.
Insulation IEC 60255-5
2.0 KVrms for 1 min between all terminals and earth2.0 KVrms for 1 min between independent circuits1.0 KVrms for 1 min across normally open contacts
High Frequency IEC 60255-22-1 class lll
Disturbance2.5KV Common (Longitudinal) mode1.0 KV Series (Transverse) mode
Electrostatic IEC 60255-22-2 class lll
Discharge6 KV Contact discharge8 KV Air discharge
Radio Frequency IEC 60255-22-3 class lll
Interference20 MHz to 1000 MHz, 10V/m
Fast Transient IEC 60255-22-4 class lV
4 KV, 5/50 ns, 2.5 KHz repetitive
Vibration (Sinusoidal) IEC 60255-21-1 class l
Shock & Bump IEC 60255-21-2 class l
t operate = x Tmk
VsV –1[ ]
α
In many applications of this relay, the third harmonic component
predominates in the residual voltage under normal conditions.
Since low setting is adopted in the relay it should not
unnecessarily sense the harmonic voltages. The type MVT 171
relay operates only for fundamental frequency and rejects all
harmonic voltages.
Design
The MVT 171 Protection unit consists of the following modules
within it’s compact dimensions.
• Input Module
• Power Supply and Output Relay module
• Measuring Module
• Front Fascia
The three modules viz. Input, Power supply and Measuring
modules are plugged into the Front fascia which house switches,
LEDs and LED display for the human machine interface. All PCBs
are well protected from one another and from external
environment with best shielding for better electromagnetic
compatibility and housed in the enclosed chassis, which is with
drawable from the outer case.
This relay has independent power supply provided with galvanic
isolation. The relay is suitable for wide range of auxiliary input
supply.
The reduced output from the voltage transformer is sampled at
the rate of 16 samples per cycle and digitized by means of
analog to digital converter. The digitized signals are processed
numerically by means of micro controller. The harmonics are
filtered in digital filter and the relay operates only for the
fundamental.
Applications
• Capacitor bank
• Ungrounded/High impedance earthed systems
• AC Generators
Features
Protection• Unbalance voltage (47)
• System earth fault
• Stator earth fault/Neutral over voltage (59N)
• Dual protection stages
• Both IDMTL & DTL curve characteristics available
• Numerical, fundamental measurement
• Highly immune to harmonics
• Dual protection stages
Control• The relay has 6 output contacts
• Element 1trip/alarm relay 2 N/O
• Common starter 1 C/O
• Element 2 alarm 1 N/O
• Element 2 trip 1 N/O
• Protection unhealthy 1 N/C
Monitoring• Self-monitoring via watchdog timer
User Interface• Seven segment LED display
• LED indications
• Sealable front cover to prevent unauthorised access
Other Features
• Drawout modular case
• Non-volatile memory for trip indication
• Wide range of auxiliary supply
NumericalNeutral DisplacementProtection
Cutout DetailsMVT 171 is a neutral displacement protection unit, comprising
two elements, namely element 1 & element 2, there by offering
two stages of protection. Element 1, the first stage of protection
is provided with Definite Time Lag (DTL). Element 2 has DTL or
numerous IDMTL curves. One of the elements can also be put
off, when it is not necessary.
Stator Earth Fault ProtectionA common method of grounding an AC generator is to connect
a distribution transformer between the neutral of the generator
and the station ground. The distribution transformer’s primary
voltage rating is equal to, or greater than, the generator’s rated
line-to-neutral voltage. The secondary is rated for 110V or
230V AC. A resistor is connected across the secondary, which
offers (square times the turns ratio of the transformer of its
value) high resistance on the primary side. This reduces the
ground fault current to great extent.
A ground fault on the generator terminal will result in rated line-
to-neutral voltage across the transformer primary where as the
ground fault near the neutral results in low voltage. The MVT
171 relay, which is connected across the secondary resistor,
will sense this voltage and operates. The setting point of this
relay must be higher than the neutral voltage results due to
normal unbalance in order to avoid nuisance trips. This will
allow certain percentage of the stator winding near the neutral
to go unprotected. For example 95% of the stator windings will
be protected, if 5% of the voltage is set (5.5V setting on the
relay for 110V AC PT supply) in the relay. (A minimum setting
possible in MVT 171 relay is 0.5V and the relay is 0.5V and the
relay is rated for 440V AC continuously)
Capacitor Bank ProtectionFor star with isolated neutral or delta connected capacitor bank,
the relay MVT 171 can be connected across the open delta
winding of the three phase PTs, the primary of which is connected
across each phase capacitor string. Alternatively for star
connected capacitor bank the relay can be connected across the
secondary of the transformer connected across the neutral of
the capacitor bank and ground. For grounded star connected
capacitor banks the MVT 171 is connected across the open
delta winding of PTs, primary of which are connected to the
uniformly tapped points of the bank and the ground.
For balanced condition no voltage will appear across the relay.
But operation of a unit fuse will cause the neutral point to be
Ordering Information
• Auxiliary supply range
Description
Numerical Neutral Displacement Protection Relay - MVT 171
MVT 171
Qualification
ISO 9001 - 2000
PART CASE CUT OUT BEZEL
A B C D
01 2/3V 149.5 148 170 170
Note:
1. All dimensions are in mm
2. All dimensions are measured equidistant from centre line
3. Maximum depth of equipment inside panel : 200mm
The policy of Easun Reyrolle is one of continuous improvement and development. The company therefore reserves the right to supply equipment,
which may differ slightly from that described and illustrated in this publication.
displaced and the voltage will appear across the relay and its
value will depend on the number of units in the capacitor bank.
In line with usual practice, operation of a single unit fuse will
impose a voltage increase of less than 1.1 times nominal design
voltage across the remaining parallel units. Hence the MVT 171
relay will provide an initial alarm function followed by a trip
operation if any further fuses in the same group operates.
Undergrounded System ProtectionAn earth fault occuring on the feeder feeding to an unearthed
transformer should be cleared by the feeder circuit breaker, but
if there is a back feeding from the unearthed transformer side,
the feeder may be maintained alive. The feeder then is a local
unearthed system, which results in arcing ground and dangerous
over voltages may occur. This condition is detected by measuring
the residual voltage on the feeder.
A MVT171 relay, which is connected across the open-delta
connected secondary winding of the PTs connected to the feeder,
will sense this displaced neutral voltage and operates. To obtain
discrimination with the protection elsewhere on the system,
appropriate inverse and voltage settings are to be chosen.
Genesis Range
FACT
/MVT
171
/08-
07/R
EV 1
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Sales OfficesBangaloreEasun Reyrolle Ltd.#17/3 Arakere, Bannerghatta Road,Bangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
BhopalEasun Reyrolle Ltd.H.No.16, Essarjee HomesNear Gopal Nagar, Kalan RoadPiplani, Bhopal - 462 021, India.Telefax: +91 755 2684221Email: [email protected]
ChennaiEasun Reyrolle Ltd.6th Floor, Temple Tower, 672,Anna Salai, NandanamChennai - 600 035, India.Tel: +91 44 24346425/24347608Fax: +91 44 24346435Email: [email protected]
DelhiEasun Reyrolle Ltd.29/12, Ground Floor, East Patel NagarNew Delhi - 110 008, India.Tel: +91 11 25747321/25747322Fax: +91 11 25747320Email: [email protected]
KolkataEasun Reyrolle Ltd.4, Dr.Sundari Mohan Avenue, 5th FloorFlat No.18, Kolkata - 700 014, India.Tel: +91 33 22848320Fax: +91 33 22848326Email: [email protected]
MumbaiEasun Reyrolle Ltd.23, Kasturi Building, Jamshedji Tata RoadMumbai - 400 020, India.Tel: +91 22 22022270/22855415Fax: +91 22 22825703Email: [email protected]
SecunderabadEasun Reyrolle Ltd.#2, 1st Floor, Paradise ChambersOpp Hotel Ambassador1-7-196 Prender Ghast RoadSecunderabad - 500 003, India.Telefax: +91 40 27817847Email: [email protected]
CORPORATE OFFICEEasun Reyrolle Limited.,98 Sipcot Industrial ComplexHosur 635 126, India.Tel: +91 4344 401600/01/02Fax: +91 4344 276397
TURNKEY PROJECTSBUSINESS/AMR BUSINESS#389, “Rasukumaki”, HulimavuBegur Hobli, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 40477200/ 201Fax: +91 80 40477202Email: [email protected]
HOSUR WORKS#98, Sipcot Industrial ComplexHosur - 635 126, India.Tel: +91 4344 401600/01/02Fax: +91 4344 276397
CENTRAL MARKETING &EXPORTS BUSINESS#17/3 ArakereBannerghatta RoadBangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
BANGALORE WORKS#17/3 Arakere, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 26581023/3268Fax: +91 80 26580642Email: [email protected]
AUTOMATION BUSINESS#389, “Rasukumaki”, HulimavuBegur Hobli, Bannerghatta RoadBangalore - 560 076, India.Tel: +91 80 40477200/ 201Fax: +91 80 40477202Email: [email protected]
Corporate OfficeEasun Reyrolle Limited. 98 Sipcot Industrial Complex,
Hosur 635 126 India.Tel: +91 4344 401600/01/02
Fax: +91 4344 276397www.easunreyrolle.com