Operation and maintenance management of Residual Current Transformer

(1) After the Residual Current Transformer is put into operation, the user shall establish operation records and corresponding management systems

(2) Electricity management personnel should at least conduct a power-on trip test for the Residual Current Transformer every month, that is, press the test button to check whether the action of the Residual Current Transformer is reliable. Whenever the Residual Current Transformer is actuated by lightning strikes or other reasons, it should be checked and a trip test should be carried out. In the peak season of rural electricity consumption, the number of trips should be increased; the disabled Residual Current Transformer should be tripped once before being used.

(3) In order to fully grasp the operating status of the Residual Current Transformer, the Residual Current Transformer should be sampled and tested regularly (such as during the annual safety inspection).

(4) The testing of the Residual Current Transformer shall be organized by the full-time safety management personnel of the power supply station under the guidance of the local power department. Items that regularly test the operating characteristics of the Residual Current Transformer should include the residual operating current value, the residual non-operating value, and the breaking time.

(5) The test contents of the low-voltage power grid include the unbalanced leakage current to the ground of the protected power grid, the protected power grid and various loads, the insulation resistance value of the motor, the leakage current of the neutral point on the low-voltage side of the distribution transformer, and the power consumption of each power grid. The earthing resistance of the equipment protective earthing device. The test data is compared with the previous test results for comprehensive analysis. Those who fail the test or have larger defects should be repaired or replaced in time.

(6) The action characteristic test of the Residual Current Transformer and the simulated leakage action test of the protection power grid shall be performed by professional personnel with the use of special measuring instruments qualified by the relevant state departments. It is strictly forbidden to use the phase line to directly touch the grounding device to conduct the simulated leakage action test of the protection grid.

(7) The process of test jumping, testing, setting and testing must be recorded by a special person, and the recorded items and data must not be confused or wrong for reference in future operation and analysis.

(8) If an electric shock casualty accident occurs within the protection range of the Residual Current Transformer, the action of the protector should be checked, the cause should be analyzed, and the accident report should be written. Note: Before the power department sends someone to check, the site must be protected, and the protector site must not be changed.

(9) If the user intentionally causes the protector to refuse to operate or malfunction, he should be given criticism, education and warning. Those who still do not repent after criticism and education can temporarily stop the electricity consumption of the household.

(10) After the Residual Current Transformer operates, if the cause of the accident is not found after inspection, it is allowed to test power transmission once. Unless it is confirmed that the Residual Current Transformer itself is faulty after inspection, it is strictly forbidden to dismantle the Residual Current Transformer without permission and forcibly transmit electricity.

(11) The maintenance of the Residual Current Transformer should be carried out by professionals. In case of abnormal phenomena during operation, an electrician should be consulted to avoid expanding the scope of the accident.

(12) The power supply station should be equipped with common test meters and a certain number of backup protectors. The operation of the Residual Current Transformer should be analyzed regularly, and the Residual Current Transformer that cannot be used normally should be replaced in time.