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A device for preventing low-voltage power supply branch circuit from closing

A low-voltage power supply and branch circuit technology, applied in the direction of circuit devices, electrical components, emergency power supply arrangements, etc., can solve problems such as high safety, affecting the AC power supply system in the station, and threatening grounding

Active Publication Date: 2018-06-15
STATE GRID SHANDONG ELECTRIC POWER
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  • Description
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Problems solved by technology

As far as the current technology is concerned, there are a large number of secondary AC devices in the station that are powered by dual power supplies. However, due to design reasons, it often happens that the two power supplies are closed at the air switch, which directly affects the AC power supply system in the station and even threatens grounding and high voltage. side security

Method used

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  • A device for preventing low-voltage power supply branch circuit from closing
  • A device for preventing low-voltage power supply branch circuit from closing

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Embodiment Construction

[0015] In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.

[0016] It can be seen from the accompanying drawings that a device for preventing low-voltage power supply branches from closing loops in this program includes two low-voltage AC branches that supply power to the same load, and the first low-voltage AC branch L1 is connected in series with the first air Switch K1, first return button QA1, first contactor C1; second air switch K2, second return button QA2, second contactor C2, first contactor The first contact C1-1 of the first contactor is connected in parallel with the first return button QA1, the second contact C1-2 of the first contactor is connected in series with the second contactor C2, and the first contact C2-1 of the second contactor is connected with the The second return button QA2 is connected in parallel, and the second ...

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Abstract

The invention provides a technical scheme of an apparatus preventing loop closing of low voltage power supply branches. The apparatus comprises two low voltage AC branches providing power for a same load. Each of the two branches is provided with an air switch, a returnable button and a contactor. Each of the two branches is provided with a current transformer. The current transformers are connected to a controller. The controller is connected to an alarm by an alarm circuit. By use of the apparatus, loop closing of two AC branches providing power for a same load is avoided; real time monitoring is achieved; once a loop closing phenomenon is detected, the apparatus will timely give an alarm so that occurrence of a dangerous accident will be avoided.

Description

technical field [0001] The invention relates to a device for preventing a low-voltage power supply branch from closing a loop. Background technique [0002] In the existing technology, the known technology is that in recent years, with the development of economy and society, the number of substations in the country, especially the number of smart substations, has been increasing, and it is particularly important to safely power the secondary system in the substation, especially the AC screen equipment in the substation with dual power supplies. As far as the current technology is concerned, there are a large number of secondary AC devices in the station that are powered by dual power supplies. However, due to design reasons, it often happens that the two power supplies are closed at the air switch, which directly affects the AC power supply system in the station and even threatens grounding and high voltage. side security. , which is the shortcoming of the prior art. Cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/02H02J13/00
CPCY02B70/30Y04S20/221
Inventor 崔健白凡尹爱辉苏娜吴雪霞田丰孟繁国尹晓敏殷晓鸣
Owner STATE GRID SHANDONG ELECTRIC POWER
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