Product classification
Environmentally friendly gas-insulated metal-enclosed switchgear
The ESR-72.5kV series environmentally friendly gas-insulated metal-enclosed switchgear is rated for a voltage of 72.5kV and a frequency of 50Hz/60Hz. The main switch circuit is enclosed in a fully sealed tank-type gas chamber, which uses clean air as the insulating medium. The gas pressure is 0.5Mpa, and there are no fluorinated gases in the chamber, achieving green environmental protection.
- Description
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Product Overview
The ESR-72.5kV series environmentally friendly gas-insulated metal-enclosed switchgear is rated at 72.5kV with a rated frequency of 50Hz/60Hz. The main switch circuit is enclosed in a fully sealed tank gas chamber, which uses clean air as the insulating medium, with a gas pressure of 0.5Mpa, and contains no fluorinated gases, achieving green and environmentally friendly standards.
The product adopts a three-phase common tube structure, with the circuit breaker arranged vertically, using vacuum interruption to achieve vacuum circuit breaker operation, ensuring long mechanical life and high reliability, with maintenance-free operation throughout its lifecycle. The isolating/grounding switch uses a three-position structure and can be configured with a fast grounding switch, featuring mechanical interlocking to eliminate misoperation and ensure high reliability. The operating mechanism is a spring-operated mechanism, safe and stable. The incoming and outgoing cables connect to the cabinet's main circuit through flood-proof cable plugs, ensuring safety and reliability throughout the entire operational lifespan.
The product has good environmental adaptability and can be applied in humid, dirty, sandy, and cold environments, mainly suitable for use in offshore and onshore wind turbine towers and gathering stations.
Environmental Conditions
Altitude: ≤ 5000m (when the operating altitude exceeds 2000m, special instructions are required)
Ambient Temperature: Maximum temperature +65℃, minimum temperature -50℃, average value within 24h ≤ 35℃
Ambient Humidity: Average relative humidity within 24h ≤ 95%, average monthly relative humidity ≤ 90%.
Pollution Level: Level 4
Corrosion Level: Offshore C4H
Seismic Level: AG5 (horizontal acceleration 0.3g, vertical acceleration 0.15g)
Electromagnetic Interference: Induced electromagnetic interference amplitude in secondary systems ≤ 1.6kV
Application Locations
66kV voltage network inside offshore and onshore wind turbine towers, 66kV voltage network in offshore and onshore wind power gathering stations.
66kV voltage network in offshore and onshore photovoltaic power generation outdoors and in box transformers, 66kV voltage network in offshore and onshore energy storage systems outdoors and in box transformers.
Implementation Standards
GB/T7674-2020 Gas-insulated metal-enclosed switchgear rated at 72.5kV and above; GB/T3906-2020 3.6kV~40.5kV AC metal-enclosed switchgear and control equipment.
GB/T11022-2020 Common technical requirements for high-voltage AC switchgear and control equipment; GB/T1984-2014 High-voltage AC circuit breakers.
GB/T16927.1~2-2013 High voltage test technology.
GB/T3309-1989 Mechanical tests of high voltage switchgear at normal temperature; GB/T4473-2018 Synthesis tests of high voltage AC circuit breakers.
GB/T5582-1993 External insulation pollution level of high voltage electrical equipment.
GB/T11023-2018 Sealing test methods for high voltage switchgear using sulfur hexafluoride gas.
DL/T593-2016 Common technical requirements for high voltage switchgear and control equipment.
IEC62271-1:2017 Common technical requirements for high voltage switchgear and control equipment; IEC62271-100:2017 AC high voltage circuit breakers.
IEC62271-200:2011 3.6kV~40.5kV AC metal-enclosed switchgear and control equipment; IEC62271-203:2011 Gas-insulated metal-enclosed switchgear rated at 52kV and above.
IEC60694-2002 Common technical requirements for high voltage switchgear and control equipment; IEC60529 Enclosure protection level (IP code).
Product Features
Clean air insulation, achieving fluorine-free, green and environmentally friendly; vacuum circuit breaker operation, high number of operations, long electrical life; three-position switch, reliable interlocking.
Isolation + fast grounding, high safety performance; modular design, strong versatility.
Fully sealed design of the main switch circuit, protection level reaches IP67.
Suitable for harsh environments such as humidity, achieving maintenance-free operation.
Compact structure, small size, suitable for distribution inside wind turbine towers.
Technical Parameters
Name
Unit
Switchgear and Circuit Breaker Parameters
Rated Voltage
kV
72.5
Rated Frequency
Hz
50/60
Rated Current
A
630 1250
2500 3150
Power Frequency Withstand Voltage
Phase-to-phase, phase-to-ground, vacuum break.
kV
160
Isolation Break.
160+42
Auxiliary and Control Circuits
2
Lightning Impulse Withstand Voltage
Phase-to-phase, phase-to-ground, vacuum break.
kV
380
Isolation Break.
380+59
Rated Short-Circuit Breaking Current
kA
31.5
40
Rated Short-Circuit Closing Current
Circuit Breaker
kA
80
100
Grounding Switch
80
100
Short-Time Withstand Current and Duration
Main Circuit
kA/s
31.5/4
40/4
Grounding Switch
31.5/4
40/4
Ground connection circuit
27.4/2
34.8/2
Rated peak withstand current
Main Circuit
kA
80
100
Grounding Switch
80
100
Ground connection circuit
69.6
87
Mechanical life
Vacuum circuit breaker
Times
10000
Isolating switch
3000
Grounding Switch
3000
Rated pressure
Rated charging pressure (at 20℃
Gauge pressure )MPa
0.5
Protection level
Main switch circuit
IP67
Mechanism box
IP55
Vacuum circuit breaker level
M2 E2 C2
Insulating gas
Clean air (environmental protection)/SF6 (optional)
Annual relative gas leakage rate
'%/ year'
≤ 0.01
Circuit breaker rated operating sequence
O-0.3s-CO-180s-CO(31.5kA) O-180s-CO-180s-CO(40kA)
Expected service life
Years
40
Operating voltage
V
AC/DC220
Product dimensions
Mainly used in offshore or onshore wind turbine towers for 66kV ring network system
Mainly used in offshore or onshore 66kV collection system
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