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Improved FC switch control loop

A switch control circuit and switch technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of FC switch tripping and refusal, burning switches, and affecting the safe and stable operation of the unit, so as to achieve reliable operation of equipment, high promotion value, Solve the effect of switch tripping and refusal

Inactive Publication Date: 2014-03-19
DATANG HUANGDAO POWER GENERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current FC switch design is prone to FC switch tripping, refusal to operate, and burning of the switch during the operation of the unit, which seriously affects the safe and stable operation of the unit.

Method used

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  • Improved FC switch control loop

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0022] Such as figure 1 As shown, an improved FC switch control loop, including:

[0023] The first branch: light-emitting diode HG, tripping position relay KTP coil, switch auxiliary contact H 2 It is connected in series with the coil of the closing relay K15 in sequence, and the remote closing contact DCS HZ is connected in parallel with both ends of the series branch of the light-emitting diode HG and the coil of the tripping position relay KTP.

[0024] The remote closing contact DCS HZ acts according to the closing command issued by the computer distributed control system of the unit.

[0025] The second branch: the normally open contact one of the closing relay K15 is connected in series with the coil of the closing holding relay K16.

[0026] The third branch: the normally open contact of the closing relay K15 2. The parallel circuit of the normally...

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Abstract

The invention discloses an improved FC switch control loop. A trip maintaining function of an original anti-tripping relay is maintained to prevent arc discharge of a contact of a protection or control loop and prevent burning of the contact. A newly-added anti-tripping relay is not started by an original anti-tripping relay current loop but started by a closing loop. The TBJ is started as long as the K15 and the ZJ act simultaneously, the F-C switch closing loop is cut off, and the aims of tripping prevention or reliable tripping can be achieved. After the control loop is improved, even if a switch closing node is closed all the time, the switch can trip reliably when a tripping command is transmitted, and the problem that switch strip resisting is prone to happen in the existing FC switch control loop is thoroughly solved. Long-term practice inspection proves that the loop is good in effect, device operation is reliable, and the loop has high popularization value in power enterprises.

Description

technical field [0001] The invention relates to the field of thermal power generating sets, in particular to an improved FC switch control loop. Background technique [0002] High-voltage vacuum contactors and high-voltage fuses, as the main switchgear for controlling and protecting 6kV high-voltage motors in power plants, are currently widely used in China. High-voltage vacuum contactors and high-voltage fuses are combined into an F-C circuit, which becomes a high-voltage circuit with comprehensive protection characteristics. The vacuum contactor-fuse combination greatly reduces the system cost; the F-C circuit has its unique advantages in controlling and protecting the motor, and can protect the load more effectively. Therefore, the reliability of the contactor control and protection circuit is particularly important for the F-C switch circuit. [0003] The current FC switch design is prone to tripping and refusal of the FC switch during the operation of the unit, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08H02H7/22
Inventor 邱永刚
Owner DATANG HUANGDAO POWER GENERATION
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