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What happens if the high-voltage grounding wire is not connected to the grounding wire and the three-phase is directly connected to the three-phase suddenly What will happen if the high-voltage grounding wire is not connected to the grounding wire and the three-phase power comes on suddenly? There is a 120 degree phase difference in the three-phase voltage, which means that the average voltage value is only about 70% of the amplitude due to the phase difference; In the power transmission system, three-phase power transmission is often used in high voltage; For example, 10kV or 35kV; Such a system has no ground wire during transmission, but that does not mean there is no current and voltage; Because there is a relative zero potential; The three-phase four wire distribution system you mentioned can transmit electricity as usual if the ground wire is not grounded; But the 220V you usually use is the difference between a live line and a neutral line; Because no -
Definition of portable short circuit grounding wire Definition of portable short circuit grounding wire 1 Portable short circuit grounding wire: a safety appliance used for temporary short circuit grounding of power cut equipment. It can be made of phase type and combination type. 2 Components of portable short circuit grounding wire: 2.1 Grounding wire: multi strand copper flexible conductor for grounding. 2.2 Short line: multi strand copper flexible conductor or copper (aluminum) rectangular hard conductor for interphase short circuit. 2.3 Clamp, including terminal lug: 2.3.1 Grounding terminal clamp: clamp connected to grounding network or grounding terminal. 2.3.2 Conductor end clamp: connected to the conductor to be grounded -
Correct use and maintenance of high-voltage electroscope Correct use and maintenance of high-voltage electroscope The high-voltage electroscope is mainly used to inspect high-voltage electrical equipment with a voltage to ground of more than 250V. At present, there are three types of high-voltage electroscope widely used: light-emitting type, acousto-optic type and windmill type. They are generally composed of detection part (indicator part or windmill), insulation part and handshake part. The insulating part refers to the part from the metal connecting screw at the lower part of the indicator to the cover retaining ring, and the handshake part refers to the part below the cover retaining ring. The insulation part and handshake part depend on the voltage level
