I. High-voltage switchgear terminology
1. High-voltage switch - rated voltage 1kV and above is mainly used to open and close the conductive circuit of the appliance.
2. High-voltage switchgear - high-voltage switch and control, measurement, protection, regulation devices and accessories, shells and support parts and components and their electrical and mechanical linkage composition of the general term.
3. indoor high-voltage switchgear - does not have the performance of wind, rain, snow, ice and thick frost, etc., suitable for installation in the building premises for use of high-voltage switchgear.
4. Outdoor high-voltage switchgear - can withstand wind, rain, snow, dirt, dew, ice and frost, suitable for installation in the open air use of high-voltage switchgear.
5. Metal-enclosed switchgear; switchgear - in addition to the inlet and outlet lines, the rest of the switchgear is completely enclosed by the grounded metal enclosure.
6. Armored metal-enclosed switchgear - the main components (such as circuit breakers, transformers, busbars, etc.) are mounted in the grounded metal partitions separated by compartments in the metal-enclosed switchgear.
7. Interval or metal-enclosed switchgear - with armored metal-enclosed switchgear, some of its components are also installed in separate compartments, but with one or more non-metallic partitions of a certain level of protection.
8. box-type metal-enclosed switchgear - in addition to armored, spaced metal-enclosed switchgear other than metal-enclosed switchgear.
9. inflatable metal-enclosed switchgear - metal-enclosed switchgear compartment with one of the following pressure systems used to protect the gas pressure of a metal-enclosed switchgear.
a. Controlled pressure system; b. Closed pressure system; c. Sealed pressure system.
10. insulated enclosed switchgear - switchgear that is completely enclosed by an insulated enclosure except for the inlet and outlet lines.
11. Combination of electrical appliances - two or more high-voltage electrical appliances, according to the requirements of the main power system wiring to form an organic whole and the name of the electrical appliances still maintain the original function of the device.
12. Gas-insulated metal-enclosed switchgear - closed combination of electrical appliances, at least part of the use of higher-than-atmospheric-pressure gas as an insulating medium of metal-enclosed switchgear.
13. circuit breaker - can close, carry, open the normal current of the operating circuit, but also in the specified time to close, carry and open the specified overload current (including short-circuit current) switchgear.
14. Sulphur hexafluoride circuit breaker -- contacts in the sulphur hexafluoride gas closure, opening circuit breaker.
15. Vacuum circuit breaker - contacts in a vacuum to close, break the circuit breaker.
16. Disconnecting switch - switchgear which, in the divided position, meets the specified requirements for insulation distance between contacts and distinctive disconnecting marks; and, in the closed position, is capable of carrying currents under normal circuit conditions and currents under abnormal conditions (e.g., short-circuits) for a specified period of time.
17. Grounding switch--a mechanical switching device used to ground a circuit. Under abnormal conditions (e.g., short circuit), it can carry a specified abnormal current for a specified time; under normal circuit conditions, it is not required to carry current.
18. load switch - a switching device capable of closing, carrying and breaking current under normal circuit conditions and carrying current for a specified period of time under specified abnormal circuit conditions (e.g., short-circuit conditions).
19. contactor - a switching and closing device, other than manually operated, having only one rest position, capable of closing, carrying and opening normal currents and specified overload currents.
20. fuse - when the current exceeds the specified value for a certain period of time, the heat generated by itself to melt and open the circuit switching device.
21. current-limiting fuse - in the specified current range when the action of its own function to limit the current below the expected peak current a fuse.
22. Jet fuse - a fuse that quenches an arc by the jet of gas produced by the arc energy.
23. Drop fuse - action after the fuse-carrying parts automatically fall, forming a fracture fuse.
24. lightning arrester - a protective appliance to limit overvoltage, which is used to protect the insulation of equipment from overvoltage.
25. Metal Oxide Surge Arrester - a surge arrester consisting of a non-linear metal oxide resistor sheet connected in series and/or parallel without or in series with a discharge gap.
26. Composite jacket gapless metal-oxide surge arrester - non-linear metal-oxide resistive sheet and the corresponding parts of the non-linear metal-oxide surge arrester and the jacket is composite insulation material gapless surge arrester.
II. Characteristic parameter terminology
1. rated voltage - in the specified conditions of use and performance of the maximum voltage can be continuously operated, and it determines the relevant test conditions of high-voltage switchgear.
2. Rated current - in the specified normal use and performance conditions, the main circuit of high-voltage switchgear can continuously carry the current value.
3. Rated frequency - in the provisions of the normal use and performance conditions can be continuous operation of the grid frequency value, and with it and the rated voltage, rated current to determine the relevant test conditions of high-voltage switchgear.
4. Rated current breaking current - under the specified conditions, the circuit breaker can ensure that the maximum short-circuit current of normal breaking.
5. Rated short-circuit closing current - in the rated voltage and the specified conditions of use and performance, the switch can ensure that the normal opening of the electric short-circuit peak current.
6. Rated short-time withstand current (rated thermal stabilization current) - under the specified conditions of use and performance, in a determined short period of time, the switch in the closed position can carry the specified current RMS value.
7. Rated peak withstand current (rated thermally stable current) - the peak current of the first large half-wave of the rated short-time withstand current that the switch can withstand in the closed position under specified conditions of use and performance.
8. Rated short-circuit duration (rated dynamic stabilizing time) - the time interval during which the switch can carry the rated short-time withstand current in the closed position.
9. Temperature rise - the difference between the temperature of each part of the switchgear when passing current and the surrounding air temperature.
10. power factor (of the circuit) - the equivalent circuit of the switchgear opening and closing test circuit, the ratio of resistance to inductive impedance at work frequency, excluding the impedance of the load.
11. Rated short-time frequency withstand voltage - according to the specified conditions and time for the test, the equipment withstand the standard value of the frequency voltage (RMS).
12. Rated operating (lightning) shock withstand voltage - in the withstand voltage test, equipment insulation can withstand the standard value of the operating (lightning) shock voltage.
Three, the operation of the term
1. operation - the dynamic contact from one position to another position of the action process.
2. Sub (gate) operation - the operation of switching from table position to sub position.
3. Closing (gate) operation - the operation of switching from the minute position to the closing position.
4. "Closing and dividing" operation - the operation of dividing the switch immediately after closing without any intentional delay.
5. Operation cycle - a continuous operation of switching from one position to another device and back to the initial position; if there are multiple positions, through all the other positions.
6. Sequence of operations - a series of operations with a specified time interval and sequence.
7. automatic reclosing (gate) operation - a sequence of operations in which a switch is automatically reclosed again after a predetermined period of time.
8. close (on) - a closing operation used to establish the energized state of a circuit.
9. Opening (breaking) - a branching operation used in the energized state of a circuit.
10. automatic reclosing - automatic reclosing (gate) operation in the energized state.
11. opening and closing - a general term for opening and closing.
12. short-circuit opening and closing - the opening and closing of short-circuit fault current.
13. short-circuit closing - the closing of the short-circuit fault current.
14. Near-area fault opening - opening of the near-area fault short-circuit current.
15. contact opening distance - the total clearance between the contacts of one pole of the switch or between any conductive parts connected in the split position.
16. Travel? Contact's - the distance from the starting position of the switch's movable contacts to any one position in the dividing and closing operations.
17. overtravel - in closing operation, the distance that the moving contact continues to move after the switch contacts have made contact.
18. Splitting speed - the operating speed of the moving contact during switch splitting (gate).
19. contact just split speed - switch closing (gate) operation process, the separation of moving contacts and static contacts instantaneous movement speed.
20. Closing speed - the speed of movement of the movable contact in the process of switch closing (gate).
21. contact just close speed - switch closing (gate) process, the dynamic contact and static contact contact contact instantaneous movement speed.
22. opening speed - the speed of the movement of the moving contact in the opening process of the switch.
23. closing speed - the speed of movement of the moving contacts of the switch during closing.