Residual Current Operation Protector Usage Guide

The popularization and application of new agricultural production electrical equipment is also accompanied by frequent electric shocks and injuries in rural areas. Due to improper use of new equipment, or being busy with production, neglecting the maintenance and inspection of electrical equipment or speeding up the production, the insulation ageing is damaged, and personal injury occurs during the busy season. There is no lack of precedents in the accident. In addition, in recent years, the development of rural lighting electricity, household appliances, busy season, the use of various types of household appliances, but also to the security of rural agricultural security risks. In order to ensure the safety of the personal equipment of the electricity-using personnel, it is an effective measure to properly use the residual current protection device. In terms of specific preventive measures, there is a rural integrated neutral point ungrounded operation; a low-voltage line installs shunt-operated electric safety devices; electric agricultural machinery equipment installs a single electric shock protector; and actively promotes home electric shock safety measures.

For residual current last-stage protection of the total protection, intermediate protection, and three-phase power-supply power equipment, residual current circuit breakers with leakage, short-circuit, and overload protection functions should be used. For single-phase residual current last-stage protection, residual current circuit breakers with residual current protection and short-circuit protection should be used.

The installation of the residual current operation protector shall meet the requirements of the manufacturer's instructions, be installed in ventilated, dry, dust-free, and no harmful gases, and should avoid strong current wires and electromagnetic devices to avoid magnetic field interference; residual current action circuit for total protection The device should be installed in front of the power distribution panel for operation and observation. The residual current operated circuit-breaker for end protection can be installed in the same meter box as the energy meter and fuse. The residual current-operated circuit breaker should be installed under the fuse; the protector wiring should be correct and the incoming line is a separate incoming line. The outlet is a separate outlet and you cannot borrow wires to save material. Inlet and outlet can not be reversed; combined residual current protection device of the zero-sequence current transformer for the pass-through type, should be as far away from the magnetic field of electrical appliances, the distance must not be less than 200 mm, the main loop through the wire should be passed together , and the length of both ends of the transformer is not shorter than 150 mm. This is mainly to prevent malfunction due to unbalanced magnetic flux under normal conditions. The wires of the external control circuit of the protector should be single stranded copper core insulated wire, and its cross section should not be less than 1.5 square millimeters. Leakage relay power supply line should be drawn from the front of the main contact of the AC contactor, the power line is best controlled by a knife switch;

After the installation of the residual current protection device, the following tests shall be carried out: with load sharing and switching for 3 times, no malfunction shall occur. Tried with the trial button 3 times, should be correct action. Each phase should be tripped 3 times with a test resistance of about 1 kOhm or a 40-watt light bulb with a 60-watt bulb, and it should be operated correctly.

For the residual current operated protector after a certain period of operation, press the test button in the operating state to check if the action is normal. Caution Do not allow the test button to be pressed for long periods of time. There must be an interval of more than 10 seconds between each operation to avoid burning out the test resistance.

Three-stage residual current operated protectors in operation are checked at least once a month. Each year, a large-scale safety inspection and a 100-day safety activity should be carried out before the peak of electricity or thunderstorm season to perform spot tests on residual current protection devices. If the residual current operated protector breaks the circuit due to a fault in the protected circuit, the cause must be ascertained. After the drain is removed, the residual current indicating button can be reset and the switch can be closed again. It is strictly forbidden to send electricity by force, and it is not allowed to quit running at will. The owner of the property rights shall establish a record of operation and test records for the residual current protection device of the total protection class. The record shall record: the date of commissioning, the acceptance test record at the time of commissioning, the number of days of operation, the number of correct actions, the number of refusals, the analysis of causes of misoperation and refusal to act.