ZHW6—126 hybrid gas-insulated switchgear
Model Name: ZHW6—126 hybrid gas-insulated switchgear
Product Category: GIS
General description：
Type ZHW6-126 hybrid gas-insulated switchgear (HGIS) has the advantages of both open air-externally insulated switchgear (AIS) and gas-insulated fully metal-enclosed switchgear (GIS). It is used in these fields of A.C. 50Hz, 110kV power system such as all kinds of substations, power plants, petrochemical, steel, coal, railway and urban power supply. It has the advantages of small land area, high reliability, short installation period, small workload in operation and maintenance.
The product generally consists of these high voltage components such as circuit breaker, disconnector + earthing switch, bushing or cable terminal, and also can upon user’ s request, be equipped with tank voltage transformer and tank lightning arrester module to meet the personal requirements of different solutions to different users.
The product uses SF6 gas as the insulation and arc-extinguishing medium, the circuit breaker adopts horizontal self-energy arc-extinguishing structure, and is equipped with a spring operating mechanism. The disconnector and earthing switch are integrated into a module and equipped with a three-position motor operating mechanism, which naturally forms mechanism blocking. The current transformer is core-through, externally installed between the bushing and disconnector for the convenience of installation, maintenance and capacity expansion.
Features：
(1)land area, more flexible arrangement, high reliability, short installation period and small workload in operation and maintenance and low construction cost.
(2)Aluminum-alloy enclosure: Light weight, low temperature rise and anti-corrosion; The loss of eddy current on the enclosure is small, so the temperature rise on the enclosure is almost not affected by current-through.
(3)Convenient transport and easy installation
(4)Use SF6 as the insulation and arc-extinguishing medium, the self-energy extinguishing principle can ensure the breaking of all kinds of fault currents.
(5)Strong adaptability, excellent earthquake-resistant performance，earthquake intensity 9°.
(6)35mm/kV。Bushings are air/SF6 gas composite silicon rubber bushings, so their weight is light and there is no explosion danger, creepage distance is 35mm/kV
technical data:
No | Item | unit | technical data |
1 | rated voltage | kV | 126 |
2 | rated frequency | Hz | 50 |
3 | rated current | A | 1250、1600、2000、2500、3150 |
4 | rated short time withstand current（4s） | kA | 40 |
5 | rated peak withstand current | kA | 100 |
6 | rated short time power frequency withstand voltage, between phases and to earth | kV | 230 |
7 | rated short time power frequency withstand voltage, across isolating distance | kV | 230+73* |
8 | rated lightning impulse withstand voltage, between phases and to earth | kV | 550 |
9 | rated lightning impulse withstand voltage, across isolating distance | kV | 550+103* |
10 | （1min）power frequency withstand voltage on auxiliary and control circuit（1min） | kV 2 | 2 |
11 | SF6 gas pressure ( gauge pressure at 20℃)rated pressure | MPa | 0.6 |
12 | SF6 gas pressure ( gauge pressure at 20℃)alarm pressure | MPa | 0.55 |
13 | SF6 gas pressure ( gauge pressure at 20℃)lock-out pressure | MPa | 0.5 |
14 | SF6 gas annual leakage |
| % ≤0.5 |