Distribution transformer neutral line breaking protection device
A technology for disconnection of distribution transformers and neutral lines, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, circuit devices, etc. Ideal operating characteristics and guaranteed safety results
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[0010] The technical solutions of the present invention will be further described in detail below through specific implementations.
[0011] Such as figure 1 As shown, a neutral wire disconnection protection device of a distribution transformer includes a neutral wire disconnection signal sampling circuit, a thyristor control circuit and an AC contactor execution circuit.
[0012] The neutral line disconnection signal sampling circuit includes a voltage dividing resistor R and a varistor RU. One end of the varistor RU is connected to the low-voltage side neutral line UN of the distribution transformer, and the other of the varistor RU is One end is connected to the ground terminal through the voltage dividing resistor R.
[0013] The thyristor control loop includes a single-phase thyristor V1, a rectifier diode V2, and an electromagnetic relay. The control electrode of the single-phase thyristor V1 is connected to the divider of the varistor RU and the voltage divider R Voltage poi...
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