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ZF4A-126 Gas Insulated Switchgear

The ZF4A-126 gas insulated switchgear is a type of miniaturized metal enclosed switchgear containing self-energy type circuit breaker coupled with spring mechanism.

1. The bay of our high voltage GIS is only 1.4 or 1.7 meters in width and 3 meters in height. This small size not only saves floor area but also facilitates transportation.

2. The circuit breaker adopts self-energy arc extinguishing technology and is matched with light spring mechanism, improving the reliability of the gas insulated switchgear.

3. All the first and secondary components of our electrical equipment adopt standard modular design, which greatly reduces the workload of design, manufacturing, assembly and adjustment.

4. The basin-type insulator, insulated tension bar, post insulator and other epoxy resin insulating devices of the gas insulated switchgear have undergone strict electric field computation and are optimally designed, thus enjoying reliable insulating performance and high safety factor. Our switchgear can withstand 1.5 to 1.7 times running voltage for a long time under zero gauge pressure.

5. Isolation and earthing switches can be electrically operated at a normal speed or a fast speed. The debugging and maintenance can be carried out manually.

6. The current transformer adopted by our gas insulated switchgear has high precision and small transformation ratio. Its secondary coil is tapped and each current transformer can be equipped with four secondary coils.

7. The gas path design is flexible and practical. The adopted self-sealing valve facilitates leak detection and repair. The simple and reliable gas monitoring system is conducive to on-site operation and management.

8. For occasions where the cable entry can not be tested, the induction type high voltage live display and locking device can be installed, so as to prevent the earthing switch mistakenly closing live lines and ensure safe running.

9. Except the main busbar, other electrical devices of the main circuit have split-phase structure. The advantages of this structure are as follows.
a. Three-phase short circuit is eliminated.
b. As the gas chamber of each electrical device is isolated from each other, the happening and expanding of fault are effectively limited.

10. The metal enclosed gas insulated switchgear has a low center of gravity, so it has good shock resistance and is easy to transport.

Technical Parameters of 126kV Gas Insulated Switchgear
Item Unit Data
Rated Voltage kV 126
Rated Current A 1250/1600/2000/2500/3150
Rated Frequency Hz 50
Rated Short-circuit Breaking Current kA 40
Place of Use Indoors/Outdoors
Altitude m ≤2500
Ambient Temperature -50~+40
Relative Humidity % Daily average ≤95;
Monthly average≤90
Earthquake Intensity deg. ≤8
Annual Gas Leakage Rate % ≤0.5
Moisture Content of SF6 Gas (Volume ratio) PPM Breaker gas chamber: 150;
Other chambers: 250
Width of Bay m 1.4/1.7
Weight of Bay t 3~6/5~10
Static Load t/m2 ≤1.5
Crane for Maintenance Hoisting Weight t 1.5~2
Hoisting Height m ≥5.5
Entry Height m ≥3.8
Width m ≥3.5
Technical Parameters of ZF4A-126 SF6 Circuit Breaker
Item Unit Data
Rated Current A 1250/1600/2000/2500/3150
Rated Short-circuit Breaking Current kA 40
Rated Short-circuit Closing Current (Peak) kA 100
Rated Dynamic Current (Peak) kA 100
Rated Thermal Stable Current(4 s) kA 40
Rated Lightning Impulse Withstand Voltage (Peak) Phase to ground, phase to phase kV 550
Break to break 550+103
Rated Short-time Power Frequency Withstand Voltage (Peak) Phase to ground, phase to phase kV 230
Break to break 230+73
Rated Short-circuit Current Breaking Times times 20
Mechanical Life times 6000
Rated Operating Sequence O-0.3s-CO-180s-CO
Closing time ms 75 ± 10
Opening time ms 30 -2+5
Close-open Time ms ≤60
No-current Interval of Automatic Recloser s 0.3
Rated Gauge Pressure of SF6 Gas (20℃) MPa 0.6
Monitoring Gauge Pressure of SF6 Gas (20℃) MPa 0.55
Lockout Gauge Pressure of SF6 Gas (20℃) MPa 0.5

As a specialized gas insulated switchgear manufacturer and supplier in China, BBE also offers withdrawable switchgear, outdoor vacuum circuit breaker, low voltage circuit breaker for ship, and more.

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