GL 308 and GL 309

Live tank circuit breakers for 52 kV and 72.5 kV
Highly Reliable Performance

GE Vernova’s GL 308 and GL 309 live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

GL 308 and GL 309

Live tank circuit breakers for 52 kV and 72.5 kV
Highly Reliable Performance

GE Vernova’s GL 308 and GL 309 live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

High Quality Components

The GL 308 and GL 309 live tank circuit breakers provide high reliability based in part on high quality components, including:

  • Third-generation self-blast interrupter chamber
  • Pressure relief system for passive protection of both substation and personnel
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF₆ filling connection (type DILO)
  • SF₆ non-return (check) valve on each pole column
  • Protected opening springs inside each pole column
  • Hot-dip galvanized steel parts
  • Mechanism housing made completely of aluminum
  • Reliable spring-operated mechanism with position indicator clearly visible from outside
Installation and Maintenance
  • Preset at factory before shipping; no adjustments necessary during installation and commissioning
  • Pole units pre-filled with SF₆ at factory before shipping
  • Independent disassembly of the interrupter chamber without having to remove the entire pole column
  • Circuit breaker completely pre-assembled before delivery
    • Three-pole operated circuit breakers: pole columns mounted on base frame
    • Single-pole operated circuit breakers: base frame with mounted and wired mechanisms
Advanced Testing

Our live tank circuit breakers meet the requirements of national and international standards. This has been confirmed by comprehensive type tests according to the latest IEC and ANSI standards.

Certified Quality

The entire development and production procedures for our live tank circuit breakers are fully compliant with the latest ISO 9001, ISO 14001 and OHSAS 18001 quality standards. This ensures the high quality of our products and services, which is confirmed by regular audits.

Specifications

Breaker typeGL 308 F1/3120/ 
GL 308 F3/3120		GL 308 F1/3120/ 
GL 308 F3/3120		GL 309 F1/3120/ 
GL 309 F3/3120		GL 309 F1/3120 
/GL 309 F3/3120
Rated voltage52 kV52 kV72.5 kV72.5 kV
Rated frequency50 Hz60 Hz50 Hz60 Hz
Rated normal currentup to 2,000 Aup to 2,000 Aup to 2,000 Aup to 2,000 A
Rated short-circuit breaking currentup to 31.5 kAup to 25 kAup to 31.5 kAup to 25 kA
Rated short-circuit making current80 kA65 kA80 kA65 kA
Rated duration of short-circuit3 s3 s3 s3 s
Opening time38 ms38 ms38 ms38 ms
Breaking time50 ms50 ms50 ms50 ms
Closing time≤70 ms≤70 ms≤70 ms≤70 ms
Average ambient temperature*-30 oC up to +40 oC-30 oC up to +40 oC-30 oC up to +40 oC-30 oC up to +40 oC
Design altitude*1,000 m.a.s.l.1,000 m.a.s.l.1,000 m.a.s.l.1,000 m.a.s.l.
* Standard values according to IEC; temperatures up to +70 oC and / or higher altitudes available on request

RATINGS

Breaker typeGL 309 F1/4031 P
Rated voltage72.5 kV
Rated frequency50/60 Hz
Rated normal currentup to 3,150 A
Rated short-circuit breaking currentup to 40 kA
Rated short-circuit making current104 kA
Rated duration of short-circuit3 s
Opening time29 ms
Breaking time50 ms
Closing time≤70 ms
Average ambient temperature*-30 oC up to +40 oC
Design altitude*1,000 m.a.s.l.
* Standard values according to IEC; temperatures down to -40 oC up to +70 oC and / or higher altitudes available on request

Drawings

gl-309-drawing
gl-309

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GL 107X

Live tank circuit breaker from 36 kV up to 40.5 kV
Highly Reliable Performance

GE Vernova’s GL 107X live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

GL 107X

Live tank circuit breaker from 36 kV up to 40.5 kV
Highly Reliable Performance

GE Vernova’s GL 107X live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

High Quality Components

The GL 107X live tank circuit breaker provides high reliability based in part on high quality components, including:

  • Third-generation self-blast interrupter chamber
  • Operating linkages in one common gas enclosure forming part of the base frame
  • Only one seal is dynamically stressed
  • Insulator flanges sealed with Portland cement
  • Pressure relief system for passive protection of both substation and personnel
  • Compact design in line with considerations of current transformers
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF₆ filling connection (type DILO)
  • Extruded aluminum base frame
  • Reliable spring-operated mechanism with position indicator clearly visible from outside
Installation and Maintenance
  • Preset at factory before shipping; no adjustments necessary during installation and commissioning
  • Pre-filled with SF₆ at factory before shipping
  • Circuit breaker completely assembled before delivery (pole columns, base frame and spring-operated mechanism
Advanced Testing

Our live tank circuit breakers meet the requirements of national and international standards. This has been confirmed by comprehensive type tests according to the latest IEC and ANSI standards.

Certified Quality

The entire development and production procedures for our live tank circuit breakers are fully compliant with the latest ISO 9001, ISO 14001 and OHSAS 18001 quality standards. This ensures the high quality of our products and services, which is confirmed by regular audits.

Specifications

Breaker typeGL 107X F1/3120GL 107X F1/3120GL 107X F1/3120
Rated voltage36 kV38 kV40.5 kV
Rated frequency50 Hz60 Hz50 Hz
Rated normal currentup to 2,000 Aup to 2,000 Aup to 2,000 A
Rated short-circuit breaking currentup to 31.5 kAup to 25 kAup to 31.5 kA
Rated short-circuit making current80 kA65 kA80 kA
Rated duation of short-circuit3 s3 s3 s
Opening time29 ms29 ms29 ms
Breaking time50 ms50 ms50 ms
Closing time58 ms58 ms58 ms
Average ambient temperature*-30 oC up to +40 oC-30 oC up to +40 oC-30 oC up to +40 oC
Design altitude*1,000 m.a.s.l.1,000 m.a.s.l.1,000 m.a.s.l.
* Standard values according to IEC; temperatures up to +70 oC and / or higher altitudes available on request

Drawings

Drawings

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T155 DUAL GAS GIL

One 420 kV GIL design for SF₆ and SF₆-free

GE Vernova's Grid Solutions offers cutting-edge gas-insulated lines (GIL) up to 420 kV designed for both SF6 and SF6-free applications, leveraging more than 60 years of expertise in gas-insulated substation technology. This unique flexible design allows transmission system operators (TSOs) to purchase the SF6 version initially with the option to transition easily to the SF6-free g³ solution, ensuring compliance with emerging regulations on fluorinated greenhouse gases without compromising operational performance.

T155 DUAL GAS GIL

One 420 kV GIL design for SF₆ and SF₆-free

GE Vernova's Grid Solutions offers cutting-edge gas-insulated lines (GIL) up to 420 kV designed for both SF6 and SF6-free applications, leveraging more than 60 years of expertise in gas-insulated substation technology. This unique flexible design allows transmission system operators (TSOs) to purchase the SF6 version initially with the option to transition easily to the SF6-free g³ solution, ensuring compliance with emerging regulations on fluorinated greenhouse gases without compromising operational performance.

g³ gas GIL Specifications

RATINGS   
VoltagekV362420
Standards IEC/IEEEIEC/IEEE
FrequencyHz50/6050/60
Withstand voltages, to earth
- Short-duration power-frequency
- Switching impulse
- Lightning impulse
kV
kV (peak)
kV (peak)
650
1050
1425
650
1050
1425
Continuous currentA4,000/5,0004,000/5,000
Short-time withstand currentkA6363
Peak withstand currentkAp170170
Temperature°C-30-25/-30

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T210 up to 800 kV

Gas-Insulated Substations up to 800 kV

GE Vernova's T210 GIS is a field-proven solution with high availability that meets the challenges of networks up to 800 kV for power generation, transmission, distribution, tertiary and heavy industry applications. The T210 is one of the most compact GIS solutions available at 800 kV with a footprint 65% below the market average. It is comprised of small, light components making it easy to handle.

T210 up to 800 kV

Gas-Insulated Substations up to 800 kV

GE Vernova's T210 GIS is a field-proven solution with high availability that meets the challenges of networks up to 800 kV for power generation, transmission, distribution, tertiary and heavy industry applications. The T210 is one of the most compact GIS solutions available at 800 kV with a footprint 65% below the market average. It is comprised of small, light components making it easy to handle.

Customer Benefits

Customer Benefits

Main Characteristics

Environment friendliness
  • Lowest gas weight on the market
  • First-in-class SF₆ sealing system
High availability
  • Design grounded by 50 years of experience
  • Current transformers outside SF₆
Low costs of land and civil works
  • Most compact GIS: footprint 65% below market average
Shortest site works
  • Light and small components, easy to handle
Smart grid features
  • full-digital monitoring, control and protection
 

Specifications

General ratings
Reference electrotechnical standardsIEEE/IEC
Voltages765/800 kV
Withstand voltages 
- Short-duration power-frequency, phase-to-earth / across isolating distance960/1270 kV
- Switching impulse, phase-to-earth / across open switching device1550/1200 (+653) kVp
- Lightning impulse, phase-to-earth / across isolating distance2100 /2100 (+460) kVp
Continuous current5000 A
Short-time withstand current50 kA
Peak withstand current125 kAp
Circuit-breaker ratings
First-pole-to-clear factor1.3
Short-circuit breaking current50 kA
Short-circuit making current125 kAp
Breaking time<45ms
Pre-insertion resistor rating>340 Ω
Mechanical enduranceM2 class
Disconnector ratings
Bus-transfer current switching capability1600/40 (3200/300 option) A/V
Mechanical enduranceM2 class

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T168 up to 550 kV

Gas-Insulated Substations up to 550 kV

GE Vernova makes the most of 50 years of experience in design, material selection, development, engineering, manufacturing and servicing of gas-insulated substations. GE Vernova's T168 GIS meet the challenges of networks up to 550 kV for all applications: power generation, transmission and heavy industry.

The T168 is compact and accessible, with a bay footprint 12% below previous version.

T168 up to 550 kV

Gas-Insulated Substations up to 550 kV

GE Vernova makes the most of 50 years of experience in design, material selection, development, engineering, manufacturing and servicing of gas-insulated substations. GE Vernova's T168 GIS meet the challenges of networks up to 550 kV for all applications: power generation, transmission and heavy industry.

The T168 is compact and accessible, with a bay footprint 12% below previous version.

Customer Benefits

Customer Benefits

Characteristics

Environment friendliness
  • Gas mass reduced by 6% compared with previous version
  • First-in-class SF₆ sealing system
  • Advanced gas management systems
High availability
  • Reliability is founded on GE Vernova’s extensive experience at 550 kV
  • Current transformers outside SF₆
  • Outstanding accessibility: drives and accessories at easy reach
Low costs of land and civil works
  • Bay volume reduced by 12% compared to previous models
Smart grid features
  • Full-digital monitoring, control and protection

Ratings

Bay  
Reference electrotechnical standards IEC/GB
VoltagekV550
Withstand voltages  
Short-duration power-frequency, phase-to-earth/across open switching devicekV740 / 740 (+315)
Switching impulse, phase-to-earth / across isolating distancekVp1 300 / 1 175 (+450)
Lightning impulse, phase-to-earth / across open switching devicekVp1 675 / 1 675 (+450)
FrequencyHz50 / 60
Continuous currentAup to 6300
Short-time withstand currentkA63
Peak withstand currentkAp170
Duration of short-circuits3
Installation indoor/outdoor
CIRCUIT-BREAKER RATINGS
First-pole-to-clear factor 1.3
Short-circuit breaking currentkA63
Short-circuit making currentkAp170
Operating sequence O-0.3s-CO-3 min-CO/CO-15s-CO
Capacitive switchingClassC2
DISCONNECTOR AND LOW-SPEED EARTHING SWITCH RATINGS
Capacitive current switchingA0.5
Bus-transfer current switching capabilityA / Vup to 4000 / 100
MAKE-PROOF EARTHING SWITCH RATINGS
Making current capabilitykAp170
Switching capability-electromagnetic couplingA / kVup to 200 / 25
Switching capability-electrostatic couplingA / kVup to 50 / 50
other data available on request.  

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B105 up to 245 kV

Gas-Insulated Substations up to 245 kV

GE Vernova's B105 GIS is a compact, field-proven solution with high availability that meets the challenges of networks up to 245 kV for power generation, transmission, distribution, tertiary and heavy industry applications. The B105 is available in several ratings:

B105 up to 245 kV

Gas-Insulated Substations up to 245 kV

GE Vernova's B105 GIS is a compact, field-proven solution with high availability that meets the challenges of networks up to 245 kV for power generation, transmission, distribution, tertiary and heavy industry applications. The B105 is available in several ratings:

Customer Benefits

Customer Benefits

Main Characteristics

Environment friendliness
  • Low gas weight
  • Advanced SF₆ sealing system
  • Smart grid features including full-digital monitoring, control and protection
High availability
  • One of the best experiences and high data reliability
  • Current transformers outside SF₆
  • Pure-spring circuit breaker drives
  • State-of-the-art maintenance isolating device: major repair and HV tests with no more than 1 bay down
  • Drives and accessories at easy reach
Low costs of land and civil works
  • One of the most compact GIS with single-phase enclosures only: bay footprint up to 50% below market average depending on kV rating
  • Complete bays assembled, wired, tested and shipped
  • Light and small single-phase components, easy to handle

Specifications

General ratings
Reference electrotechnical standardsIEC/IEEE/GB
Voltagesup to 245 kV
Withstand voltages 
- Short-duration power-frequency, phase-to-earth / across isolating distance460/530 kV
- Lightning impulse, phase-to-earth / across isolating distance1050/1200 kVp
Frequency50/60 Hz
Continuous current3150/4000 A
Short-time withstand current50/63 kA
Peak withstand current135/170 kAp
Duration of short-circuit3s
InstallationIndoor/outdoor
Ambient temperature rangedown to -25 / up to +55 °C
Circuit-breaker ratings
First-pole-to-clear factor1.3-1.5
Short-circuit breaking current50/63 kA
Short-circuit making current135/170 kAp
Operating sequenceO-0.3s-CO-3 min-CO/CO-15s-CO
Drive type (three-phase or single-phase)Pure-spring
Breaking time<50 ms
Closing time<100 ms
Mechanical enduranceM2 class
Capacitive switchingC2 class
Disconnector and low-speed earthing switch ratings
Capacitive current switching0.25 A
Bus-transfer current switching capability1600 A / 20 V
Mechanical enduranceM2 class
Make-proof earthing switch ratings
Making current capability135/170 kAp
Switching capability - electromagnetic coupling80 A / 2 kV
Switching capability - electrostatic coupling3 A / 12 kV
Mechanical enduranceM1 class

 

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F35-170 kV

Gas-Insulated Substations up to 170 kV

Our F35 GIS is a field-proven solution offering high availability and reliability for networks up to 170 kV. It is ideally suited for a wide range of applications, including power generation, transmission, distribution, commercial, and heavy industrial sectors. The F35-170 kV GIS uses SF₆ gas as both switching and insulating medium.

The F35-170 kV GIS will soon transition to a SF₆-free version, with the integration of our g³ gas technology planned in 2026. This evolution supports a more decarbonized grid while maintaining the same high level of performance and reliability.

F35-170 kV

Gas-Insulated Substations up to 170 kV

Our F35 GIS is a field-proven solution offering high availability and reliability for networks up to 170 kV. It is ideally suited for a wide range of applications, including power generation, transmission, distribution, commercial, and heavy industrial sectors. The F35-170 kV GIS uses SF₆ gas as both switching and insulating medium.

The F35-170 kV GIS will soon transition to a SF₆-free version, with the integration of our g³ gas technology planned in 2026. This evolution supports a more decarbonized grid while maintaining the same high level of performance and reliability.

Main Characteristics

Environment friendliness
  • Low gas weight
  • Advanced SF₆ sealing system
  • Smart grid features including full-digital monitoring, control and protection
  • Available in g³ up to 145 kV
High availability
  • One of the best experiences and high data reliability
  • Current transformers outside SF₆
  • Drives and accessories at easy reach
  • Pure-spring circuit breaker drives
Low costs of land and civil works
  • One of the most compact GIS with bay footprint up to 45% below market average depending on kV rating
  • Up to 2 bays (145 kV), up to 3 bays (72.5 kV), and complete bays (170 kV) assembled, wired, tested and shipped
  • Isolating device for voltage transformer / surge arrester
Applicable for wind turbines at 72.5 kV
  • Handle more power while reducing energy losses
  • A compact HV substation fits in the wind turbine
  • Withstands harsh environments
  • Short installation time

Specifications

General ratings
Reference electrotechnical standardsIEC/IEEE/GBIEC/IEEE/GBIEC/IEEE
Voltages72.5 kV145 kV170 kV
Withstand voltages   
- Short-duration power-frequency, phase-to-earth / across isolating distance140/160 kV275/315 kV325/375 kV
- Lightning impulse, phase-to-earth / across isolating distance325/375 kVp650/750 kVp750/860 kVp
Frequency50/60 Hz50/60 Hz50/60 Hz
Continuous currentup to 2500Aup to 3150Aup to 4000A
Short-time withstand current31.5 kA40 kA50 kA
Peak withstand current85 kAp100/108 kAp125/130 kAp
Duration of short-circuit3s3s3s
InstallationIndoorIndoor/outdoorIndoor
Ambient temperature rangedown to -30 / up to +55 °Cdown to -30 / up to +55 °Cdown to -25 / up to +55 °C
Circuit-breaker ratings
First-pole-to-clear factor1.51.51.5
Short-circuit breaking current31.5 kA40 kA50 kA
Short-circuit making current80/82 kAp100/108 kAp125/130 kAp
Operating sequenceO-0.3s-CO-3 min-CO/CO-15s-COO-0.3s-CO-3 min-CO/CO-15s-COO-0.3s-CO-3 min-CO/CO-15s-CO
Drive type (three-phase or single-phase)Pure-springPure-springPure-spring
Breaking time50 ms50 ms50 ms
Closing time70 ms95 ms100 ms
Mechanical enduranceM2 classM2 classM2 class
Capacitive switchingC2 classC2 classC2 class
Disconnector and low-speed earthing switch ratings
Capacitive current switching0.1 A0.1 A0.1 A
Bus-transfer current switching capability1600/10 A / V2520/20 A / V1600/10 A / V
Mechanical enduranceM2 classM2 classM2 class
Make-proof earthing switch ratings
Making current capability80/82 kAp100/108 kAp125/130 kAp
Switching capability - electromagnetic coupling80/2 A / kV80/2 A / kV80/2 A / kV
Switching capability - electrostatic coupling2/6 A / kV2/6 A / kV3/9 A / kV
Mechanical enduranceM1 classM1 classM1 class

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F35-145 kV Dual Gas GIS

SF₆ and SF₆-free g³-Gas-Insulated Substations up to 145 kV

Our F35-145 kV Dual-Gas GIS —compatible with both SF₆ and g³ gases—is designed to meet the demands of electrical networks up to 145 kV. It is ideally suited for a wide range of applications, including offshore and onshore wind power generation, distribution networks, infrastructure projects, and industrial installations.

F35-145 kV Dual Gas GIS

SF₆ and SF₆-free g³-Gas-Insulated Substations up to 145 kV

Our F35-145 kV Dual-Gas GIS —compatible with both SF₆ and g³ gases—is designed to meet the demands of electrical networks up to 145 kV. It is ideally suited for a wide range of applications, including offshore and onshore wind power generation, distribution networks, infrastructure projects, and industrial installations.

Main Characteristics

Environment friendliness
  • SF₆-free using GE Vernova’s g³ gas mixture instead of SF₆
  • No pollution transfer in form of raw material increase
  • GWP of the gas mass reduced by 99%
  • Advanced sealing system
High availability
  • Same principles, interfaces, operating mechanisms for both product in g³ and SF₆
  • Easy access to drives and accessories
  • Pure-spring circuit breaker drives
Low costs of land and civil works
  • One of the most compact GIS with bay footprint up to 45% below market average depending on kV rating allows to have low civil work and compact switchgear buildings
  • Up to 2 bays 145 kV assembled, wired, tested and shipped
  • Isolating device for voltage transformer and surge arrester
Smart Grid ready
  • Smart grid features including full-digital monitoring, control and protection
  • One of the best experiences and high data reliability
  • Digital substation ready with LPITs (Low Power Instrument Transformers)

Specifications

General ratings
Reference electrotechnical standards

IEC

Voltages

Up to 145 kV

Insulating and switching medium

g³ gas mixture

Withstand voltages
Short-duration power-frequency, phase-to-earth / across isolating distance

275/315 kV

Lightning impulse, phase-to-earth / across isolating distance

650/750 kVp

Frequency

50 Hz

Continuous current

up to 3150 A

Short-time withstand current

40 kA

Peak withstand current

108 kAp

Duration of short-circuit

3s

Circuit-breaker ratings
First-pole-to-clear factor

1.5

Short-circuit breaking current

40 kA

Short-circuit making current

108 kAp

Operating sequence

O-0.3s-CO-3 min-CO
CO-15s-CO

Drive type (three-phase or single-phase)

Pure-spring

Breaking time

50ms

Closing time

95ms

Mechanical endurance

M2 class

Capacitive switching

C2 class

Disconnector and low-speed earthing switch ratings
Capacitive current switching

0.1 A

Bus-transfer current switching capability

2520/20 A / V

Mechanical endurance

M2 class

Make-proof earthing switch ratings
Making current capability

108 kAp

Switching capability - electromagnetic coupling

80/2 A / kV

Switching capability - electrostatic coupling

2/6 A / kV

Mechanical endurance

M1 class

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GPM-F Field Ground Protection Module

Complete generator system protection

The field ground protection module, GPM-F works in combination with the Multilin G60 to detect ground faults in the field winding of the generator. Providing application flexibility, the field ground protection module can be configured for either single point injection or double point injection based on application requirements. The solution includes: two stage field ground detection, injected voltage and current supervision, brush lift-off detection, field over and under current elements and field ground fault location.

GPM-F Field Ground Protection Module

Complete generator system protection

The field ground protection module, GPM-F works in combination with the Multilin G60 to detect ground faults in the field winding of the generator. Providing application flexibility, the field ground protection module can be configured for either single point injection or double point injection based on application requirements. The solution includes: two stage field ground detection, injected voltage and current supervision, brush lift-off detection, field over and under current elements and field ground fault location.

Protection
  • Two stage field ground resistance based element - 64F
  • Wide range fault resistance coverage (1- 500Kohms)
  • Injection frequency range 0.1 – 3Hz based on field winding capacitance
  • Fault location feature while using single point injection
  • Brush-lift off detection
  • Injection blocking input for field flashing condition
  • Supports redundant G60 configurations
  • Field over current and field under current elements using dcmA input of G60
Diagnostics
  • Power swing blocking and out-of-step tripping
  • Backup distance
  • Reverse / low forward power
  • Restricted ground fault
  • Overexcitation
  • Generator unbalance

Providing application flexibility and diagnostic information, single point injection provides the ability to quickly identify the fault location in the field winding, thus reducing damaging the generator and reducing down-time. Single point injection has traditionally been the protection method used for generators with brushless excitation.

In addition to single point injection, the GPM-F module allows for ground fault detection via double point injection. Double point injection has typically been used on applications where generators are equipped with static excitation. When the GPM-F is connected for double point injection the fault location feature is not available. It is recommended that is fault location is required that the GPM-F be configured for single point injection.

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GPM-F Field Ground Protection Module

The field ground protection module, GPM-F works in combination with the Multilin G60 to...

GPM-S

Complete Generator System Protection

Stator ground module works in combination with GE Vernova’s Multilin G60 and MiCOM Agile P345 to provide a 100% stator ground fault protection that is operational during generator start-up, running and stopped conditions. In the 100% stator ground fault protection based on sub-harmonic injection, a 20Hz voltage is injected to detect ground faults at any point across 100% of the winding thereby protecting the complete stator winding and allowing early detection of stator ground fault conditions.

GPM-S

Complete Generator System Protection

Stator ground module works in combination with GE Vernova’s Multilin G60 and MiCOM Agile P345 to provide a 100% stator ground fault protection that is operational during generator start-up, running and stopped conditions. In the 100% stator ground fault protection based on sub-harmonic injection, a 20Hz voltage is injected to detect ground faults at any point across 100% of the winding thereby protecting the complete stator winding and allowing early detection of stator ground fault conditions.

Protection.

  • Two stage stator ground resistance based element – 64S
  • Wide range fault resistance coverage (1-20Kohms)
  • Over current element for low resistance faults
  • CT phase angle error compensation

Diagnostics

  • Sub-harmonic voltage supervision
  • Sub-harmonic current supervision
  • Extensive internal diagnostics in the module with critical-fail relay

gpms
  • The 100% stator ground fault protection is based on sub-harmonic injection
  • 20Hz voltage is injected to detect ground faults at any point across 100% of the winding
  • The stator ground module works in combination with the G60 or P345 to provide 100% stator ground fault protection
  • Operational during generator start-up, running and stopped conditions

gpm-block

20 Hz Injection Module

Using sub-harmonic injection provides early detection of stator ground fault conditions. This is accomplished by the injection module generating a square wave pulse of 20Hz with a magnitude of +/-26V into the stator winding. The injection module monitors the frequency and magnitude of the signal it generates which allows for the Stator module to determine if a ground fault has occurred in the stator winding. In addition, the stator module is also equipped with a critical-fail relay that can be wired to alarm failure of the module.

Coupling Filter

The coupling filter is used to meet two functions: to smooth the square wave and convert it into a sine wave and to protect the injection module from AC voltage impressed from the secondary of neutral grounding transformer. Coupling filter contains only passive components. It also contains voltage divider circuits to be used on applications with NGT secondary voltage greater than 500V

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