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No-voltage release automatic reclosing device

An automatic reclosing and voltage loss tripping technology, applied in emergency protection circuit devices, AC network voltage adjustment, power network operating system integration, etc. question

Inactive Publication Date: 2019-07-16
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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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 no-voltage release automatic reclosing device, which is used for a power distribution system and is connected with a circuit breaker of the power distribution system. The circuit breaker is connected with a closing button AK. The no-voltage release automatic reclosing device comprises an automatic closing circuit; the automatic closing circuit comprises a delay relay S1, arelay U2 and a delay relay S2. The closing button AK, a contact switch S11 of the delay relay S1 and a contact switch U21 of the relay U2 form a series loop; the delay relay S1 is normally open, anda coil of the delay relay S1 is connected with the power supply side of the power distribution system; the delay relay S2 is normally open, and a coil of the delay relay S2 is connected with the loadside of the power distribution system; the contact switch S21 of the delay relay S2, a coil of the relay U2 and the load side of the power distribution system are connected in series; the relay U2 isnormally closed; and after the power supply side is electrified, the power distribution system is automatically switched on through the no-voltage release 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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IPC IPC(8): H01H9/54H02H7/04H02J3/14
CPCH01H9/54H02H7/04H02J3/14Y02B70/3225Y04S20/222
Inventor 郭军
Owner 郭军
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