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Single-phase multi-function meter power circuit

Date: 2018-03-27
Viewed: 21
案例名称: Single-phase multi-function meter power circuit

Nowadays, most power supply departments have required the newly installed single-phase watt-hour meter to withstand high voltage (such as 380V voltage) in order to prevent damage to the watt-hour meter due to incorrect connection of the power grid or artificially use the over-voltage power supply method to destroy the watt-hour meter. ) For a certain period of time (such as 4h) without damage, if the input circuit of the single-phase meter is not processed, the input high voltage will cause the watt-hour meter to burn out in a short time. As long as a suitable PTC thermistor is connected in series with the input end of the transformer for overcurrent protection, and the external voltage is mainly applied to the PTC thermistor, the linear transformer can be prevented from being heated and damaged. In order to ensure that no malfunction occurs, the non-operating current of the thermistor should be selected with reference to the actual AC input current of the meter, and leave a 50% margin. The Curie temperature should be ≥80 °C; at the maximum working temperature, the maximum load When working, the meter can not be protected, and at the lowest working temperature, when the input terminal is added with 380V AC, the PTC in the meter should protect in a short time to ensure that the meter is not damaged. The circuit diagram is shown in Figure 4. 

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