High-voltage switchgear terminology

The general term for the combination of high-voltage switchgear and control, measurement, protection and regulation devices and accessories, enclosures, and support components, and their electrical and mechanical connections.

1. High-voltage switch - rated voltage of 1kV and above is mainly used to break and close the electrical circuit of the electrical equipment.

2. High-voltage switchgear - The general term for the combination of high-voltage switchgear and control, measurement, protection and regulation devices and accessories, enclosures and supports, and their electrical and mechanical connections.

3. Indoor high-voltage switchgear - does not have wind, rain, snow, ice and thick frost, suitable for installation in high-voltage switchgear used in construction sites.

4. Outdoor high-voltage switchgear - can withstand wind, rain, snow, pollution, condensation, ice and thick frost, suitable for installation in the open-air high-voltage switchgear.

5. Metal-enclosed switchgear; switchgear – except for the inlet and outlet lines, the rest are completely enclosed by a grounded metal enclosure.

6. Armoured metal-enclosed switchgear - Metal-enclosed switchgear that consists of main components (such as circuit breakers, transformers, busbars, etc.) installed in compartments separated by a grounded metal partition.

7. Spaced or metal-enclosed switchgear - Like armored metal-enclosed switchgear, some of its components are also housed in separate compartments but have one or more non-metallic separators that meet certain levels of protection.

8. Box-type metal-enclosed switchgear - Metal-enclosed switchgear in addition to armored, spaced metal-enclosed switchgear.

9. Inflatable metal-enclosed switchgear - The metal-enclosed switchgear compartment has one of the following pressure systems used to protect the gas pressure of a metal-enclosed switchgear.

a. Controllable pressure system; b. Closed pressure system; c. Sealed pressure system.

10. Insulated closed switchgear - except for the inlet and outlet lines, other switchgears that are completely enclosed by an insulative housing.

11. Combination appliances - Two or more high-voltage electrical appliances, according to the main wiring requirements of the power system to form an organic whole and the name of the appliance still maintains the original set of features of the device.

12. Gas-insulated metal-enclosed switchgear - Enclosed-type combinational appliances, at least a part of which employs a metal-enclosed switchgear that uses a gas above atmospheric pressure as the insulating medium.

13. Circuit breakers - Switchgears that can close, load, and break the normal current in a running circuit, and that can also close, carry, and break specified overload currents (including short-circuit currents) within a specified time.

14. Sulphur hexafluoride circuit breakers - circuit breakers in which the contacts are closed and open in sulfur hexafluoride gas.

15. Vacuum circuit breakers - circuit breakers in which contacts are closed and broken in vacuum.

16. Isolation switch - in the sub-position, the insulation distance and obvious disconnection mark between the contacts in accordance with the requirements; in the position, can carry the current under the normal circuit conditions and abnormal conditions (such as short circuit) within the specified time Under the current switchgear.

17. Grounding switch - A mechanical switching device used to ground the circuit. Under abnormal conditions (such as a short circuit, the specified abnormal current can be carried for a specified time; under normal circuit conditions, no load current is required.

18. Load switch - Switchgear capable of closing, carrying, and breaking current under normal circuit conditions and carrying currents for a specified period of time under specified abnormal circuit conditions (such as short circuit conditions).

19. Contactor - Except for manual operation, there is only one rest position, which can close, load and break the normal current and the specified overload current breaking and closing device.

20. Fuses—When the current exceeds a specified value for a certain period of time, the switching device that melts and breaks the circuit by heat generated by itself.

21. Current-limiting fuses - A type of fuse that limits the current to a peak value below the expected current when operating within the specified current range.

22. Jet fuses - fuses that extinguish the arc by the injection of gas generated by the arc energy.

23. Drop-type fuses - After the action, the load is automatically dropped to form a broken fuse.

24. Arrester – A protective device that limits overvoltage. It is used to protect the insulation of the device from overvoltage hazards.

25. Gap-free metal oxide arresters - Arresters consisting of non-linear metal oxide resistors in series and/or in parallel with no or series discharge gaps.

26. Composite jacket gapless metal oxide surge arresters - A gapless lightning arrester consisting of a non-linear metal oxide resistive chip and corresponding parts and whose jacket is a composite insulating material.