A power harmonic detection device
A technology for detection devices and power harmonics, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices for automatic disconnection, etc., can solve the problems of no automatic control of disconnection and inaccurate detection results of power harmonics, etc., to achieve Ease of use
Active Publication Date: 2018-09-28
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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Problems solved by technology
In the prior art, the detection results of power harmonics for three-phase power are inaccurate, and there is no function of automatic control of disconnection, so there is room for improvement
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[0009] The present invention will be further described below in conjunction with accompanying drawing:
[0010] Such as figure 1 Shown: the present invention includes the first inductance L1 to the third inductance L3, the first rectifier DR1, the second rectifier DR2, the capacitor C, the regulator tube DW, the thyristor SCR, the first button switch AN1, and the second button switch AN2 and a contactor, the first inductance L1, the second inductance L2 and the third inductance L3 are respectively inductively connected to the three cables of the three-phase power supply, the first inductance L1 to the third inductance are connected in series, and the first inductance L1 to the third inductance after series connection Both ends of the third inductance L3 are connected to the two input ends of the first rectifier DR1, and the two input ends of the second rectifier DR2 are respectively connected to any two phases of the three-phase power supply through the second button switch AN...
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The invention discloses a power harmonic detection device. The power harmonic detection device comprises a first inductor, a second inductor, a third inductor, a first rectifier, a second rectifier, a capacitor, a voltage-regulator tube, a silicon controlled rectifier, a first button switch, a second button switch and a contactor; the coils of the first inductor, the second inductor and the third inductor sleeve a power cable; when current flows through the power cable, the inductors are utilized to generate current; after being rectified by the first rectifier, the current is outputted to the control end of the silicon controlled rectifier; and when power harmonic is too large, the current reaches the turn-on point of the silicon controlled rectifier, the silicon controlled rectifier is turned on, so that the second rectifier can output the current, and as a result, the contactor is disconnected from the control switch of the contactor. Compared with the prior art, and according to the power harmonic detection device of the invention, the inductors induct the power harmonic on the power cable, when the generated power harmonic is too large, the contactor is controlled automatically so as to make power cut off automatically, and therefore, detection and protection can be achieved. The power harmonic detection device is convenient to use and has a popularization and application value.
Description
technical field [0001] The invention relates to a power detection device, in particular to a power harmonic detection device. Background technique [0002] Since the effective component of the AC power grid is a single frequency of the power frequency, any component different from the power frequency can be called a harmonic. Since the sinusoidal voltage is applied to the nonlinear load, the fundamental current is distorted and harmonics are generated. The main nonlinear loads are UPS, switching power supply, rectifier, frequency converter, inverter, etc. In the prior art, the detection result of the power harmonic detection for the three-phase power is inaccurate, and there is no function of automatic control of disconnection, so there is room for improvement. Contents of the invention [0003] The purpose of the present invention is to provide a power harmonic detection device in order to solve the above problems. [0004] The present invention achieves the above obje...
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IPC IPC(8): H02H3/52
CPCH02H3/52
Inventor 陈宇温欣玲刘兆瑜程琤赵雨斌张海军
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS