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An automatic reclosing device for voltage loss tripping

A technology of automatic reclosing and voltage loss tripping, which is applied to emergency protection circuit devices, AC network voltage adjustment, climate sustainability, etc., and can solve problems such as failure to quickly and timely restore low-voltage user power supply, low-voltage user power failure, etc.

Inactive Publication Date: 2021-05-04
郭军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the stable operation of the system and the safe and reliable operation of the equipment, the distribution transformers of the 10KV power distribution system are equipped with a voltage-loss tripping device. When the power distribution system fails, the voltage-loss tripping device disconnects the low-voltage load of the distribution transformer. After normal operation, the power operator will arrive at the distribution transformer where the loss of voltage tripped and manually close the switch, while a short-term 10kV high-voltage power outage (fault power outage, grounding line selection, load switching) will cause a large area of ​​low-voltage users Loss of voltage and power failure, at this time, a large number of personnel and vehicles are required to restore low-voltage power supply, and it is still impossible to quickly and timely restore low-voltage user power supply

Method used

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  • An automatic reclosing device for voltage loss tripping
  • An automatic reclosing device for voltage loss tripping
  • An automatic reclosing device for voltage loss tripping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A voltage-loss tripping automatic reclosing device is used in a power distribution system and is connected to a circuit breaker of the power distribution system, and the circuit breaker is connected to include a closing button AK.

[0033] The automatic reclosing device for undervoltage tripping includes an automatic closing circuit, and the automatic closing circuit includes a relay U1, a time-delay relay S1, a relay U2, a time-delay relay S2, a resistor R1, a voltmeter V1 and a voltmeter V2.

[0034] Such as figure 1 As shown, the closing button AK, the contact switch U11 of the relay U1, the contact switch S11 of the delay relay S1 and the contact switch U21 of the relay U2 form a series circuit;

[0035] Wherein, the delay relay S1 is normally open, and the coil of the delay relay S1 is connected to the power supply side of the power distribution system;

[0036] The delay relay S2 is normally open, and the coil of the delay relay S2 is connected to the load side o...

Embodiment 2

[0043] On the basis of Embodiment 1, the automatic reclosing device for loss of voltage tripping includes a casing, and the casing is provided with a powerful magnet, which is easy to install and directly adsorbs the transformer box. In the case of no power failure, the installation only needs 5 minutes, without affecting the normal operation of the equipment, and can be installed at any position according to the conditions of the equipment on site. The device is externally connected with wiring clips, which facilitates the installation of the aluminum row in the box-type transformer.

Embodiment 3

[0045] Correspondingly, a combination of automatic reclosing devices for loss of voltage tripping includes N pieces of the above-mentioned automatic reclosing devices for tripping of voltage loss, which are respectively installed in N transformers, and the N automatic reclosing devices for voltage loss tripping The delay setting time of delay relay S1 is staggered from each other, and the reclosing actions of N transformers are staggered, which effectively reduces the damage of the system excitation inrush current to the equipment of the power distribution system and ensures the safe and reliable operation of the system.

[0046] Putting this embodiment into the 630KVA distribution transformer in the community, the reclosing action is reliable, and each delay period can be effectively reclosed. Through the measurement, it can be seen that the excitation inrush current of the system is significantly reduced.

[0047] Please refer to the table below for ammeter changes when the d...

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Abstract

The invention provides a voltage-loss tripping automatic reclosing device, which is used in a power distribution system and is connected to a circuit breaker of the power distribution system. The circuit breaker is connected to a closing button AK. The device includes an automatic closing circuit, and the automatic closing circuit includes a time-delay relay S1, a relay U2 and a time-delay relay S2. The closing button AK, the contact switch S11 of the delay relay S1 and the contact switch U21 of the relay U2 form a series circuit; the delay relay S1 is normally open, and the coil of the delay relay S1 is connected to the The power supply side of the electrical system; the time-delay relay S2 is normally open, and the coil of the time-delay relay S2 is connected to the load side of the power distribution system; the contact switch S21 of the time-delay relay S2, the coil of the relay U2 . The load side of the power distribution system is connected in series; the relay U2 is normally closed; when the power supply side is energized, the power distribution system is automatically closed through the voltage-loss tripping automatic reclosing device.

Description

technical field [0001] The invention relates to an automatic reclosing device for voltage loss tripping. Background technique [0002] For the stable operation of the system and the safe and reliable operation of the equipment, the distribution transformers of the 10KV power distribution system are equipped with a voltage-loss tripping device. When the power distribution system fails, the voltage-loss tripping device disconnects the low-voltage load of the distribution transformer. After normal operation, the power operator will arrive at the distribution transformer where the voltage loss tripped and manually close the switch, while a short-term 10kV high-voltage power outage (fault power outage, grounding line selection, load switching) will cause a large area of ​​low-voltage users Loss of voltage and power outage, at this time, a large number of personnel and vehicles are required to restore low-voltage power supply, and it is still impossible to quickly and timely resto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/54H02H7/04H02J3/14
CPCH01H9/54H02H7/04H02J3/14Y02B70/3225Y04S20/222
Inventor 郭军
Owner 郭军
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