| Brand | ROCKWILL |
| Model NO. | 550KV GIS Gas Insulated Switchgear (GIS) |
| Rated voltage | 550KV |
| Rated normal current | 6300A |
| Series | ZF27 |
Description：
ZF27-550 , developed independently by company, is the GIS with the 550KV level, its technical parameters has been reached the international leading level. Used in the power system of 550KV, can be realized the controlling, measurement and protection. The main components include circuit breakers, disconnectors, earthing switches, quick earthing switches, current transformers, busbars and bushings for the wire’s incoming and outgoing. The external insulation of the bushing is air insulation, the rest of components are closed in the eath’s crust which use SF6 gas as arc extinguishing and insulating medium. Can be combined into different connection mode according to user’s requirements.
Main Features：
Circuit breaker arcing chamber is a single fracture design, simple and reasonable structure, high technical content.
Strong breaking capacity, long contact electrical life, long service period.
Circuit breaker unit is installed on site without opening the chamber, which can be filled the SF6 gas directly, to avoid the intrusion of dust and foreign bodies.
There are almost no external pipe for this new type of hydraulic operating mechanism, the possibility of oil leakage is reduced.
When operating the oil pressure, hydraulic operating mechanism is controlled by the pressure switch automatically, can be maintained constantly the rated oil pressure without being affected by ambient temperature, at the same time, the relief valve in the mechanism can be exempted from the risk of overpressure.
After the loss of pressure, hydraulic operating mechanism has the function of not slowing points when the pressure is reconstructed.
The closing resistance of the product can be installed or removed according to the user’s requirements.
Technical Parameters：
What are the technical parameters of gas-insulated Switchgear？
Rated Voltage:
Common rated voltage levels include 72.5kV, 126kV, 252kV, 363kV, and 550kV. The rated voltage determines the maximum operating voltage that the equipment can withstand and is a crucial factor in the design and selection of GIS (Gas-Insulated Switchgear) equipment. It must match the voltage level of the power system to ensure that the equipment operates safely and reliably under both normal and fault conditions.
The rated current ranges from a few hundred amperes to several thousand amperes, such as 1250A, 2000A, 3150A, 4000A, etc. The rated current indicates the maximum current that the equipment can carry continuously without damage. When selecting the equipment, it is necessary to consider a certain margin based on the actual load conditions to ensure that the equipment does not fail due to overload during normal operation and can also meet future load growth requirements.
Typically, the rated short-circuit breaking capacity ranges from 31.5kA to 63kA or even higher. This parameter measures the equipment's ability to interrupt short-circuit currents. When a short-circuit fault occurs in the power system, the short-circuit current increases dramatically. The GIS equipment must be able to quickly and reliably interrupt the short-circuit current to prevent the fault from escalating. The rated short-circuit breaking capacity must be greater than the maximum possible short-circuit current in the system to ensure the safety performance of the equipment during a short-circuit condition.
The rated pressure of SF₆ gas in the equipment is generally between 0.3MPa and 0.7MPa. The actual operating pressure may be adjusted according to the specific requirements of the equipment and environmental factors such as temperature. During operation, it is necessary to monitor and control parameters such as the pressure, humidity, and purity of the SF₆ gas to ensure they remain within specified limits. This ensures the insulation and arc-quenching performance of the equipment.
