Power check is a simple test of power system. Through power check, it can be determined whether there is voltage in power-off equipment, so as to ensure the safety of grounding wire installation personnel and prevent malignant accidents such as grounding wire installation or grounding disconnector closing.
When checking electricity, you must use a tested electroscope that meets the system voltage level within the validity period. In particular, it is forbidden to mix with electroscope that does not meet the system voltage level. Because the low-voltage system uses a high-voltage electroscope, electricity may not be detected; Otherwise, the safety of operators will not be guaranteed.
Extended data
Electrical equipment inspection requirements, electricity inspection is a simple test of the power system, through which it can determine whether there is voltage in the power outage equipment, so as to ensure the safety of grounding wire installation personnel and prevent the occurrence of malignant accidents such as live grounding wire or live grounding knife switches.
1, high pressure test, the operator must wear insulating gloves.
2, check the electricity, must use the test qualified, within the validity period, in line with the system voltage level electroscope. In particular, it is forbidden to mix with electroscope that does not meet the system voltage level. Because Xiangtai Electric suggested using high-voltage electroscope in low-voltage system, electricity may not be detected; Otherwise, the safety of operators will not be guaranteed.
3. It is forbidden to use ordinary (waterproof) electroscope or insulating pull rod during outdoor electricity inspection in rainy days, so as to avoid flashover due to moisture or discharge along the surface, causing personal accidents.
4, first check the electroscope on the charged equipment, should be confirmed to be good.
5, power equipment on both sides (such as both sides of the circuit breaker, transformer high and low voltage side, etc. ) and the need for short circuit grounding, phase by phase check electricity.
Check each phase of electricity on the equipment grounding wire or grounding isolating switch. Insulating gloves must be worn for high voltage test, and the telescopic insulating rod of electroscope must be fully stretched. When testing electricity, the hand must be held at the handle, and it is not allowed to cross the retaining ring. The human body should keep a safe distance from the electricity testing equipment. Outdoor direct electricity inspection is not allowed in rainy and snowy weather.
For equipment that cannot be directly tested, indirect tests can be conducted, that is, changes in mechanical indication position, electrical indication, instrument and charged display device of the disconnector should be checked, and at least two or more indications should change at the same time. In case of remote control operation, it is necessary to check the status indication, telemetry, remote control signal and indication of live display device of the disconnector for indirect test.
For electrical equipment of 330kV and above, indirect electricity inspection method can be used for electricity inspection. An electroscope or insulating rod with appropriate voltage level, qualified test and valid period must be used. Insulating gloves must be worn for high-voltage electricity inspection. 10 kv and below lines, as well as trackless DC lines, should use electroscope to check the electricity; For lines of 35 kV and above, insulated poles can be used for discharge.
For multi-layer lines erected on the same pole, low voltage should be applied first and then high voltage; A priori lower layer, a posteriori upper layer. Each phase on both sides of electrical equipment must be checked to prevent accidents caused by one side or one phase being charged.