The control circuit for tripping the circuit breaker under voltage loss by the external circuit
A technology of voltage tripping and external circuit, applied in the protection of undervoltage or no-voltage reaction, etc., can solve the problem of inability to meet the installation requirements of high-power synchronous motors, achieve simple design, strong operability, and avoid damage Effect
Active Publication Date: 2018-06-12
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
Because some of the existing high-voltage circuit breakers do not have the function of tripping under voltage loss, the high-voltage circuit breakers without the function of tripping under pressure test cannot meet the installation requirements for high-power synchronous motors
Method used
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Embodiment Construction
[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0016] Such as figure 1 As shown, the control circuit for the external circuit of the present invention to realize the tripping of the circuit breaker under voltage loss includes a circuit breaker DC control mother 11, a normally open external circuit 1, a circuit breaker 2, an intermediate relay 3, a diode 4, a capacitor 5, and a resistor 6 And a normally closed external circuit 7;
[0017] The circuit breaker DC control bus 11 is connected with a control power supply positive line 8 and a control power supply negative line 9; the circuit breaker 2 has a first pair of normally open contacts 22 and a circuit breaker tripping coil 21, and the intermediate relay 3 has The first pair of normally closed contacts 31, the second pair of normally closed contacts 32 and the third pair of normally open contacts 33;
[0018] The control power positive line 8, t...
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The invention discloses a control circuit for achieving decompression tripping of a circuit breaker through an external loop. The control circuit can achieve decompression tripping of the high-voltage circuit breaker to play a protecting role on the circuit. The control circuit comprises a circuit breaker DC control bus, a normally open external circuit, the circuit breaker, an intermediate relay, a diode, a capacitor, a resistor and a normally closed external circuit, wherein the circuit breaker DC control bus is provided with a positive electrode line of a power supply and a negative electrode line of the power supply; and the circuits are arranged between the positive electrode line of the power supply and the negative electrode line of the power supply as follows: the diode, normally open auxiliary contacts of the intermediate relay, the capacitor and the resistor are connected in series, the normally closed external circuit and a circuit breaker tripping coil are connected in series to form a circuit breaker tripping loop, two pairs of normally closed auxiliary contacts of the intermediate relay are connected with the capacitor and the auxiliary normally open contacts of the circuit breaker in series and are connected to the loop of the circuit breaker tripping coil in parallel and the normally open external circuit is connected with the intermediate relay in series. By the control circuit, the design is simple, the reliability is high, the control circuit can be achieved by common electrical devices and the operability is high.
Description
technical field [0001] The invention relates to the field of electric power system and automation thereof, in particular to a control circuit for realizing the voltage-loss tripping of a circuit breaker by an external circuit. Background technique [0002] Known: high-power synchronous motors with power greater than 10MW need to install high-voltage circuit breakers in order to protect the motors during installation; and the high-voltage circuit breakers installed are required to be able to realize the function of tripping when the power supply loses voltage, so as to realize Protection of the motor. Because some existing high-voltage circuit breakers do not have the function of tripping under voltage loss, the high-voltage circuit breakers without the function of tripping under pressure test cannot meet the installation requirements for high-power synchronous motors. Contents of the invention [0003] The technical problem to be solved by the present invention is to prov...
Claims
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IPC IPC(8): H02H3/24
CPCH02H3/24
Inventor 陈晓宏牟英
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD