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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

Inactive Publication Date: 2014-09-24
HENAN KAIQI POWER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the electrical appliances with a rated working voltage of 220V phase voltage will bear the l

Method used

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  • Distribution transformer neutral line breaking protection device

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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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Abstract

The present invention provides a distribution transformer neutral line breaking protection device which comprises a neutral line breaking signal sampling circuit, a controllable silicon control loop and an AC contactor execution loop. The neutral line breaking signal sampling circuit comprises a voltage dividing resistor R and a varistor RU. The controllable silicon control loop comprises a controllable silicon V1, a rectifier diode V2 and a relay. The AC contactor execution loop comprises an AC contactor. According to the distribution transformer neutral line breaking protection device, through detecting neutral line abnormal overvoltage, the AC contactor is controlled to disconnect a distribution transformer low voltage side output power supply, and the damage to a single-phase electrical appliance caused by distribution transformer low voltage side neutral line breaking is avoided. The distribution transformer neutral line breaking protection device has the advantages of simple and reasonable circuit design, high action sensitivity, ideal operation characteristics, safety and reliability, the device can be widely used in the power supply line of a rural power distribution system public transformer and is used as a distribution transformer neutral line breaking protection device, and the safety of power supply is ensured.

Description

technical field [0001] The invention relates to a neutral line disconnection protection device, in particular to a distribution transformer neutral line disconnection protection device. Background technique [0002] In the power supply lines of public transformers in rural power distribution systems, most of the power consumption is domestic electricity, that is, there are many single-phase loads, such as lighting, TV, computer and other single-phase electrical appliances. These single-phase electrical appliances are often difficult to evenly distribute on the three phase lines, making the three-phase load current extremely unbalanced, causing the neutral line loop current to increase, causing the neutral line terminal on the low-voltage side of the distribution transformer to heat up, until Blow out the neutral wire. If the neutral line on the low-voltage side of the distribution transformer is disconnected, abnormal overvoltage is bound to occur. At this time, the electr...

Claims

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Application Information

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IPC IPC(8): H02H5/10H02H3/20
Inventor 陈世忠刘飞李阁华徐耀锋
Owner HENAN KAIQI POWER IND
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