Product classification
Gas-insulated metal-enclosed switchgear
ZFW-126/T3150-40 type gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS) is a complete set of switchgear that combines components such as circuit breakers, isolating switches, grounding switches, current transformers, surge arresters, busbars, incoming and outgoing line bushings, or cable terminals, enclosed within a grounded metal shell, filled with SF₆ (SF₆+N₂) gas at a certain pressure as the insulating medium. It is suitable for three-phase AC 50/60Hz power systems with a rated voltage of 72.5~126kV.
- Description
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Product Overview
1. ZFW-126/T3150-40 gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS) is a complete set of switchgear that combines components such as circuit breakers, isolating switches, grounding switches, current transformers, surge arresters, busbars, incoming and outgoing line bushings, or cable terminals, enclosed in a grounded metal shell, filled with SF₆ (SF₆+N₂) gas at a certain pressure as the insulating medium, suitable for three-phase AC 50/60Hz power systems with a rated voltage of 72.5~126kV.
2. GIS complies with the national standard GB/T7674—2020 "Gas-insulated metal-enclosed switchgear for 72.5kV and above" and meets the International Electrotechnical Commission standard IEC62271-203:2011 "Gas-insulated metal-enclosed switchgear for 52kV and above". All components are in accordance with their respective national standards.
3. GIS has a three-phase common chamber structure.
4. GIS is tested and verified according to GB/T7674-2020 and IEC62271-203:2011 standards.
Environmental Conditions
Installation Location Indoor or outdoor Ambient Temperature -25 to +40℃ (indoor) / -40 to +55℃ (outdoor) Altitude 1000~4000m Air Humidity Daily average ≠ 100%, monthly average × 100%. Wind Speed ≠ 35m/s (wind pressure not exceeding 700Pa) Solar Radiation Intensity ≤ 0.1W/cm² (0.5/s wind speed) Seismic Intensity Horizontal acceleration ≤ 0.5g, vertical acceleration ≤ 0.5g Ice Thickness ≤20mm Creepage Distance 25mm/kV (Level III pollution level), 31mm/kV (Level IV) No flammable, explosive hazards, chemical corrosion, or severe vibration. Standards
GB/T7674-2020 GB/T11022-2020 GB/T1984-2014 GB/T1985-2023
Common technical requirements for gas-insulated metal-enclosed switchgear with a rated voltage of 72.5kV and above, high voltage AC switchgear and control equipment standards.
High Voltage AC Circuit Breaker
High Voltage AC Isolating Switch and Grounding Switch
GB/T16927.1~2-2013 High Voltage Test Technology
GB/T3309-1989 GB/T4473-2018 GB/T5582-1993 GB/T11023-2018
Mechanical tests of high voltage switchgear at normal temperature, synthetic tests of high voltage AC circuit breakers.
Pollution level of external insulation of high voltage power equipment.
Sealing test methods for sulfur hexafluoride gas in high voltage switchgear.
DL/T593-2016 Common technical requirements for high voltage switchgear and control equipment standards, DL/T617-2019 Technical conditions for gas-insulated metal-enclosed switchgear.
IEC62271-1:2017 Common technical requirements for high voltage switchgear and control equipment standards.
IEC62271-100:2021 AC high voltage circuit breakers.
IEC62271-102:2018 AC high voltage isolating switches and grounding switches.
IEC62271-203:2011 Gas-insulated metal-enclosed switchgear with a rated voltage of 52kV and above.
Product Features
1. A newly designed compact GIS, with a minimum compartment width of 0.8m, and a standard compartment occupying 2.8m², is at the leading level in the country.
2. The circuit breaker equipped with GIS adopts the "thermal expansion + assisted blowing" self-extinguishing principle, with strong breaking capacity and short arcing time. The total breaking time is three cycles, with a long electrical life, capable of breaking at full capacity 22 times, and has a simple and reliable structure.
3. The circuit breaker is equipped with a CTB-1 spring operating mechanism, which has a simple and compact structure, high reliability, low maintenance workload, and a mechanical life of up to 10,000 times, meeting the requirements of "oil-free".
4. The GIS shell is made of aluminum alloy material, making the product lightweight, reducing on-site construction workload, requiring less foundation load, corrosion-resistant, with low eddy current loss and low shell temperature rise.
5. The level of radio interference is below 500μV, making it suitable for installation near urban and residential areas.
6. Strong environmental adaptability, suitable for harsh environmental conditions (such as severe pollution, water mist, hail areas, etc.), high altitude and earthquake-prone areas, as well as densely populated urban areas with limited land use and mountainous hydropower stations with difficult excavation.
7. Strong flexibility, can be combined into various connection methods such as bridge wiring, line transformer group wiring, double busbars according to user requirements. Especially the double bus double CT layout scheme is unique in the country.
8. Except for the outgoing bushings and some connecting busbars, GIS can achieve whole compartment transportation, greatly reducing on-site installation workload and construction period.
9. According to user requirements, GIS can achieve online detection and intelligent control.
10. GIS can be installed indoors or outdoors, with strong product adaptability.
Technical Parameters
Main Technical Parameters of ZFW-126
Serial Number Technical Requirements Unit Value 1 Rated Voltage kV 126 2 Rated Frequency Hz 50/60 3 Rated Current A ≤3150 4 Rated Short-Time Withstand Current kA 40 5 Short-Circuit Duration S 4 6 Rated Short-Time Power Frequency Withstand Voltage kV 275 (to ground, phase to phase) 275+84 (breakdown) 7 Rated Lightning Impulse Withstand Voltage (peak) kV 650 (to ground, phase to phase) 650+119 (breakdown) 8 Rated SF₆ Gas Pressure/Alarm Value (20℃) MPa Circuit Breaker Gas Chamber 0.6/0.55 Other Gas Chambers 0.4/0.35 Rated SF₆+N₂ Gas Pressure/Alarm Value (20℃) MPa Busbar, Isolator and Other Gas Chambers 0.58/0.55 9 SF₆ (SF₆+N₂) Gas Annual Leakage Rate % ≤0.1 10 SF₆ Gas Moisture Content (20℃) ppm
(μL/L)Circuit Breaker Gas Chamber ≤150 (during handover) Other Gas Chambers ≤250 (during handover) SF₆+N₂ Gas Moisture Content (20℃) ppm
(μL/L)Busbar, Isolator and Other Gas Chambers ≤200 (during handover) 11 Partial Discharge Amount pC ≤5 12 Radio Interference Level μV ≤500 13 Spacing Width m 0.8 Main Technical Parameters of Each Component
(1) Circuit Breaker
Serial Number Technical Requirements Unit Value 1 Rated Short-Circuit Breaking Current kA 40 2 Rated Short-Circuit Closing Current kA 100 3 Full Capacity Breaking Times Times 22 4 Rated Charging Current of Open and Close Lines A 50 5 Rated Out-of-Step Breaking Current kA 10 6 Near Zone Fault Breaking Current kA 36 (L90), 30 (L75) 7 First Opening Pole Coefficient / 1.3/1.5 8 Rated Operating Sequence / O—0.3s—CO—180s—CO 9 Closing Time ms 70~100 10 Opening Time ms 24～40 11 Total Breaking Time ≤3 cycles 12 SF₆ Gas Locking Pressure (20℃) MPa 0.5 13 Equipped Operating Mechanism Spring Operating Mechanism CTB-I 14 Mechanical Life Times 10000 15
CTB-I Mechanism Split/ Close Coil
Voltage (DC) V 220 110 Closing Coil Resistance/Current Q/A 110/2 33/3.3 Opening Coil Resistance/Current Q/A 93/2.3 28/3.9 16
CTB-I Mechanism Motor
Power W 600 Voltage (DC/AC) V 220 Rated Current A 2.3 17
Dynamic Load
N
2000 (vertically upward) 2000 (vertically downward) (2) Three-Position Switch
Rated Operating Time Opening ≤6s Closing ≤6s Rated Control Voltage/Power (DC/AC) 220V/360W Rated Operating Torque 120N ·m Rated Busbar Switching Current/Voltage 1600A/100V Loop Resistance Value ≤40μΩ Rated short-time withstand current/duration 40kA/4s Rated peak withstand current 100kA Rated Short-Time Power Frequency Withstand Voltage 275kV (to ground, phase-to-phase) 275+84 kV (breakpoint) Rated Lightning Impulse Withstand Voltage (peak) 650 kV (to ground, phase-to-phase) 650+119 kV (breakpoint) Rated bus charging current 2A (3) Fast grounding switch
Rated Operating Time Disconnection ≤6s (including energy storage time) Closing ≤6s (including energy storage time) Rated Control Voltage/Power (DC/AC) 220V/360W Rated Operating Torque 128N ·m Fast type rated short-circuit closing current 100kA Fast type opening and closing electromagnetic induction current/voltage 100A/6kV Fast type opening and closing electrostatic induction current/voltage 5A/6kV
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