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Zero-loss depth current-limiting protection device

A deep current limiting and protection device technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve hidden dangers of equipment failure, increase operating costs, and increase busbars Connection and other problems to ensure safe operation, improve service life, and protect electrical equipment

Inactive Publication Date: 2015-08-05
SOLVE AIR HEFEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operating cost of the enterprise not only increases, but also increases the space for installing the cabinet and the busbar connection between the reactor devices, artificially creating a hidden point of failure in the equipment

Method used

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  • Zero-loss depth current-limiting protection device

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Effect test

Embodiment Construction

[0010] see figure 1 , a zero-loss deep current-limiting protection device, which includes a Rock coil, a measurement and control unit, a high-speed switch, and a deep current-limiting reactor 1, and the measurement and control unit is respectively connected to a Rock coil, a high-speed switch, and a deep current-limiting reactor 1 The two ends of the high-speed switch are respectively connected to the two ends.

[0011] The present invention monitors the system current through the Rock coil. When the short-circuit current is greater than the set amplitude, the measurement and control unit can quickly and accurately predict the precise time of the zero-crossing point of the three-phase current through a special algorithm, and send out a signal before the current of each phase crosses zero. Signal, to control the high-speed switch when the current is close to zero crossing, the three phases are accurately opened and disconnected, the short-circuit current commutates into the dee...

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Abstract

A zero-loss depth current-limiting protection device relates to the technical field of over-voltage absorption in a power system. The protection device is characterized in that the device comprises a Rogowski coil, a measurement and control unit, a high-speed switch and a depth current-limiting reactor 1, wherein the measurement and control unit is connected with the Rogowski coil and the high-speed switch, and the two ends of the depth current-limiting reactor 1 are connected with the two ends of the high-speed switch respectively. The device is fast in speed, high in breaking capacity and good in current-limiting effect, not only can protect electrical equipment of a transformer and a motor and the like in a system, but also improves service life of a load vacuum circuit breaker at a short circuit point.

Description

technical field [0001] The invention relates to the technical field of power system overvoltage absorption, in particular to a zero-loss deep current limiting protection device. Background technique [0002] As we all know, when a short-circuit fault occurs in the power system, the short-circuit current is generally more than ten times the rated current, which causes great danger to electrical equipment such as transformers, generators, circuit breakers, and transmission lines. At present, the more economical and practical vacuum circuit breaker The breaking capacity is below 40KA, and the breaking time needs tens of milliseconds. With the development and growth of various types of power consuming enterprises, the power consumption load has risen sharply, and the capacity of the main transformer has also increased accordingly. The short-circuit current faced by individual enterprise power grid systems has approached or reached the maximum use limit of the load vacuum circuit...

Claims

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Application Information

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IPC IPC(8): H02H9/02
Inventor 不公告发明人
Owner SOLVE AIR HEFEI
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