Three-phase alternating current phase sequence error correction device
A technology of three-phase AC and error correction device, which is applied in the direction of phase sequence/synchronization indication, emergency protection circuit device, electrical components, etc., which can solve the problem of reducing system reliability and safety, failing to make fault alarm prompts, and unable to guarantee, etc. problem, to achieve the effect of improving reliability and safety
Active Publication Date: 2014-02-19
AUCMA
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Problems solved by technology
Although the input power of the circuit is cut off to avoid damage to the equipment, it cannot guarantee the normal operation of the electrical equipment when the connection is wrong. The power supply circuit of the phase-consuming equipment cannot give a fault alarm prompt, which reduces the reliability and safety of the system
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments.
[0022] Such as figure 1 As shown, the three-phase AC phase sequence error correction device includes a single-chip microcomputer, a positive phase sequence circuit and a reverse phase sequence circuit for driving the motor. The positive phase sequence circuit is provided with a power switch relay KA1 and a phase sequence protector RM1. A fuse FU1 is arranged between the phase sequence protector RM1 and the power switch relay KA1, a power switch relay KA2 and a phase sequence protector RM2 are arranged on the reverse phase sequence circuit, and the phase sequence protector RM2 and the power switch relay A fuse FU2 is arranged between KA2, and both the power switch relay KA1 and the power switch relay KA2 are connected to the single-chip microcomputer; the input terminals L1...
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The invention discloses a three-phase alternating current phase sequence error correction device. The three-phase alternating current phase sequence error correction device comprises a single-chip microcomputer, a positive phase sequence circuit and a reverse phase sequence circuit, wherein the positive phase sequence circuit and the reverse phase sequence circuit drive a motor to rotate. A power switch relay KA1 and a phase sequence protector RM1 are arranged on the positive phase sequence circuit. A power switch relay KA2 and a phase sequence protector RM2 are arranged on the reverse phase sequence circuit. The power switch relay KA1 and the power switch relay KA2 are both connected with the single-chip microcomputer. The input ends L1, L2, L3 of the phase sequence protector RM1 are connected with three-phase supply buses A, B, C respectively; the input ends I1, I2, I3 of the phase sequence protector RM2 are connected with the three-phase supply buses C, B, A respectively. The output end of the phase sequence protector RM1 is connected with a three-phase alternating current contactor KM1, and the output end of the phase sequence protector RM2 is connected with a three-phase alternating current contact KM2. The three-phase alternating current phase sequence error correction device can ensure normal operation of equipment no matter whether the phase sequence is correct or not, and the reliability and safety of the whole system are improved.
Description
technical field [0001] The invention relates to a three-phase AC phase sequence error correction device. Background technique [0002] A three-phase circuit is a circuit in which three sinusoidal electromotive forces with the same frequency, the same amplitude, and a phase difference of 120° are used as power supplies. Compared with single-phase power supply, three-phase circuit can increase power by 50% in power generation, and save 25% of steel in power transmission than single-phase power transmission. In power distribution, three-phase transformers are more economical than single-phase transformers and easy to connect to loads. In terms of equipment, it has the advantages of simple structure, low cost, reliable operation, and convenient maintenance. It has been widely used in power and is currently the main power supply method used in power systems. Three-phase electrical equipment has strict requirements on the phase sequence. If there is a wrong connection or other ab...
Claims
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Login to View More IPC IPC(8): H02H11/00G01R29/18
Inventor 张震德刘宗岳高丽君孙玥
Owner AUCMA