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Low-voltage breaker with high voltage open-phase protection

A technology for low-voltage circuit breaker and phase loss protection, which is applied in emergency protection circuit devices, emergency protection devices for automatic disconnection, switches that operate when the voltage is lower than a predetermined value, etc. Unreliable and other issues

Active Publication Date: 2008-07-23
FOSHAN NANDIAN SWITCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing low-voltage circuit breakers can only protect the secondary side (low-voltage side) for phase loss. When there is a phase loss on the primary side (high-voltage side) of the transformer, the voltage will be too large and the electrical appliances connected to the secondary side will be damaged. In the case of burning, it is unreliable to use and prone to safety accidents

Method used

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  • Low-voltage breaker with high voltage open-phase protection
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Embodiment Construction

[0011] This device protects against the high-voltage phase loss on the primary side of the transformer by the low-voltage circuit breaker on the secondary side. The mechanism is as follows:

[0012] (1) For the △ / Yn junction method: that is, when the primary winding (high voltage) of the transformer is a delta junction method, and the secondary winding (low voltage) is a volume-shaped (midpoint grounding) junction method (as shown in Figure 1),

[0013] When phase B of the primary side loses phase (or both phases A and C are the same), the voltage U AB =U BC =1 / 2U AC . At this time, there are two situations for the secondary side:

[0014] iNo load or with resistive load

[0015] Uab=Ubc≤1 / 2Uac

[0016] ii with motor load

[0017] Uab=Ubc<1 / 2Uac

[0018] (2) For the Y / Yn junction method, that is, when the primary winding (high voltage) of the transformer is a neutral point ungrounded junction method, and the secondary winding (low voltage) is a neutral point grounded ju...

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Abstract

The invention discloses a low-voltage circuit breaker with high voltage phase-lack protection, which comprises a circuit breaker body, wherein the circuit breaker body is fixed with an electrical apparatus release and comprises a high voltage phase-lack protection control module, the control module comprises a low voltage power module for connecting with the secondary side phase line of transformer, a sampling module for picking voltage parameter of the transformer secondary side, an analysis comparative module and an output execution module, the output end of sampling module is connected with the analysis comparative module, the out end of analysis comparative module is connected with the output execution module, the output execution module is connected with the low voltage power, when the data which is picked by the sampling module is judged normal by the analysis comparative module, the trip coil of the output execution module doesn't work so that the electrical apparatus release doesn't work, when the sample picked by the sampling module is lack of phase, the analysis comparative module controls the electrical apparatus release via the trip coin of the output execution module so that the circuit breaker is tripped, the electric circuit is cut and the original side phase-lack protection of the transformer is achieved.

Description

technical field [0001] The invention relates to a low-voltage circuit breaker, in particular to a low-voltage circuit breaker with high-voltage phase loss protection. Background technique [0002] Existing low-voltage circuit breakers can only protect the secondary side (low-voltage side) for phase loss. When there is a phase loss on the primary side (high-voltage side) of the transformer, the voltage will be too large and the electrical appliances connected to the secondary side will be damaged. The situation of burning occurs, the use is unreliable, and safety accidents are prone to occur. Contents of the invention [0003] In order to solve the above problems, the object of the present invention is to provide a low-voltage circuit breaker that is reliable in use and capable of protecting high-voltage phase loss. [0004] The technical scheme that the present invention solves its problem adopts is: [0005] A low-voltage circuit breaker with high-voltage phase loss pro...

Claims

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Application Information

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IPC IPC(8): H02H3/253H01H83/12
Inventor 钟连宏莫均全
Owner FOSHAN NANDIAN SWITCH
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