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19
2023
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06
What are the multiple electric shock accidents
【overview】Abstract: In the power industry, electric shock is one of the most important aspects of personal accidents in power production. Including professional categories and illegal forms, there are about ten types of personal electric shock accidents as follows
(1) Low-voltage electric shock: There are many low-voltage electric shock mainly occurring on the user's lighting equipment. If the insulation of the household line is damaged (the maintenance is not carried out in time), the wire appliance on the clothes is charged, the wet hand twist bulb touches the metal lamp mouth by mistake, and the insulation of household appliances is damaged and charged, it is easy to cause low-voltage electric shock.
(2) Induction electric shock: when working on electrical equipment and power lines, electric shock caused by induction charging is easy to occur when operation and maintenance personnel fail to cut off power according to the requirements of the safety regulations, violate the safety operation regulations, take short-circuit grounding measures for electricity inspection, or there is no connecting bottom line between some power-off equipment, etc.
(3) The charged equipment is boarded by mistake. Electrical workers habitually violate regulations and go at the wrong interval or mishear, misread or board live equipment without permission or supervision.
(4) The tower of live line is boarded by mistake. It often happens that defects are found during maintenance operations or during accident inspections of maintenance personnel, which violate the provisions of the Safety Regulations, misread the pole position, pole number and pole climbing without vigilance, do not check the electrical grounding, and cause electric shock when touching equipment.
Miscontact with live equipment and wires. It is mainly the operation, maintenance and experimental personnel working on the electrical equipment, and the safety measures in the operation are not perfect. If temporary barrier or insulation board should be set but not set, insulation sleeve should be used but not adopted, monitoring is not in place during work or electric shock occurs when leaving the guardian.
In order to protect their own personal safety and the safety of others, Wuhan Zhongke Electric Power hopes that maintenance personnel will take safety protection measures to avoid unnecessary injuries.
Variable frequency series resonant withstand voltage test equipment is mainly used for AC withstand voltage test of cross-linked cable, hydraulic generator, main transformer, bus, GIS and so on. It is composed of variable frequency control power supply, excitation transformer, reactor, capacitor voltage divider and compensation capacitor. Because the voltage, waveform and frequency and the electric field state inside the insulation of the tested object are consistent with the actual operation, and the test voltage is higher than the actual operation voltage, therefore, the insulation strength is strict, direct and effective method.
Overview of Operation Test of Electrical High Voltage Test Equipment
In addition to the long-term operation under rated voltage, the power generation, supply and consumption equipment in the power system must have the insulation strength under overvoltage. Overvoltage refers to the voltage rise that exceeds the normal operating voltage, which is the damage of electrical equipment or protective equipment. In all kinds of power system accidents, a large part is caused by the insulation damage of equipment caused by overvoltage. When the insulation is defective, if it is not found and eliminated in time, it will eventually lead to equipment damage and power failure.
Characteristics of gas-filled test transformer
The inflatable test transformer is a brand-new test equipment, which adopts the characteristics of GIS combination cabinet, with small quality, light volume and beautiful appearance. Its technical indicators have reached the standard requirements, high insulation strength, compressive strength for the same pressure of nitrogen 2.5 times, 2.5 times the breakdown voltage of air. It is equal to the breakdown voltage of oil at 0.25MPa and twice the breakdown voltage of oil at 0.45MPa.