A zero-blind-zone anti-islanding protection system for low-voltage distributed generators

A distributed power supply and protection system technology, which is applied in the direction of protection, emergency protection circuit devices, electrical components, etc. that react to the reverse of power transmission, can solve problems such as potential safety hazards, power grid power outage maintenance, etc., to increase speed, Ensure stable work and facilitate maintenance

Pending Publication Date: 2018-12-21
STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY +1
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a low-voltage distributed power supply zero-blind zone anti-islanding protection system to solve the technical problem of potential safety hazards caused by the existing anti-islanding protection system during power grid inspection and maintenance

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  • A zero-blind-zone anti-islanding protection system for low-voltage distributed generators
  • A zero-blind-zone anti-islanding protection system for low-voltage distributed generators

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Embodiment Construction

[0022] Such as figure 1 , figure 2 As shown, a low-voltage distributed power supply zero-blind zone anti-islanding protection system includes a box body 1, a reverse power protector 2, a protection module 3 and an output controller 4, and the reverse power protector 2, protection module 3 and output The controllers 4 are all arranged in the box body 1, and one end of the reverse power protector 2 is connected to a first current transformer 21, and the first current transformer 21 is installed on the low-voltage side of the transformer of the low-voltage distributed power supply. The other end of the reverse power protector 2 is connected to the output controller 4, and one end of the protection module 3 is connected to a second current transformer 31, and the second current transformer 31 is installed at the input of the grid-connected switch of the low-voltage distributed power supply end, the other end of the protection module 3 is connected to the output controller 4, and...

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Abstract

The invention relates to a zero blind area anti-islanding protection system of low-voltage distributed power supply, include that box, inverse power protector, a protection module and an output controller, one end of the inverse power protector is connected with a first current transformer, the other end of the inverse power protector is connected with an output controller, one end of the protection module is connected with a second current transformer, the other end of the protection module is connected with an output controller, and the output controller is connected with a grid-connected switch of a low-voltage distributed power source; Advantages of the invention: detecting the current on the low-voltage side of the transformer by a first current transformer connected to the reverse power protector, As current reversal is detect, Through the output controller, the low-voltage distributed power supply can be forced to switch on and off immediately, thus ensuring that no arc island is formed in 100% of the low-voltage distributed power supply, ensuring that the distributed power supply will not return high-voltage power to the 10KV line through the transformer, ensuring the safety of the repair or maintenance personnel, and avoiding the occurrence of mass casualties.

Description

technical field [0001] The invention relates to a zero-blind zone anti-islanding protection system of a low-voltage distributed power supply. Background technique [0002] The anti-islanding protection system is an important protection system for the distributed power supply in the power distribution room, and the anti-islanding protection should have active and passive types. The active type includes high frequency, active and reactive power changes, and the passive type includes voltage phase jumps and frequency changes. , the island protection trip outlet is generally connected to the grid-connected circuit breaker. When the islanding phenomenon occurs, the grid-connected circuit breaker is cut off. Therefore, the anti-islanding protection system must be able to accurately detect the voltage and frequency of the grid-connected point, and then when the voltage and frequency fluctuate and are greater than When customizing, the tripping outlet acts and the grid-connected swi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02B1/46H02B1/28
CPCH02B1/28H02B1/46H02J3/38H02J3/388H02H7/22H02J3/381H02H3/003
Inventor 付小平洪道鉴张军达陈明旭陈敏志应国德袁楚楚胡奕挺郑远德黄镇
Owner STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY
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