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Protective circuit for current transformer function protection

A technology of current transformer and protection circuit, which is applied in the field of signal processing technology and protection circuit, can solve problems such as danger and high voltage, achieve better effect and realize the effect of overload protection

Inactive Publication Date: 2016-11-23
成都云士达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to facilitate measurement, protection and control, it needs to be converted into a relatively uniform

Method used

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  • Protective circuit for current transformer function protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A protection circuit for the function protection of the current transformer, which can use the relay circuit to act on the contactor to trip the contactor, thereby cutting off the power supply of the motor, and realizing overload protection, rapid braking, and phase failure protection, such as figure 1 As shown, the following structure is specially set up: an AC input circuit, a relay circuit, a switch tube circuit, a filter circuit, a rectifier circuit and a protection coil circuit are provided, the AC input circuit is connected to the relay circuit, and the relay circuit is connected to the switch The switching tube circuit is connected to the filter circuit, the filter circuit is connected to the rectifier circuit, the rectifier circuit is connected to the protection coil circuit, and the relay circuit controls the contactor connected to the protected circuit; in the protection coil circuit A potentiometer W2, a control coil L1 and a control switch KT are arranged ins...

Embodiment 2

[0029] This embodiment is further optimized on the basis of the above-mentioned embodiments, further to better realize the present invention, such as figure 1 As shown, the following setting method is adopted in particular: a resistor R1, a capacitor C1, a capacitor C3 and a diode D1 are arranged on the AC input circuit, and the first end of the capacitor C1 is connected to the first end of the resistor R1 and simultaneously AC power supply (220v alternating current), the second end of the capacitor C1 is connected to the second end of the resistor R1 and connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the first end of the capacitor C3 and connected to the first end of the capacitor C3. The relay circuit is connected, and the second end of the capacitor C3 is respectively connected to the AC power supply and the switching tube circuit.

Embodiment 3

[0031] This embodiment is further optimized on the basis of any of the above embodiments, further to better realize the present invention, such as figure 1As shown, the following setting method is adopted in particular: a capacitor C2, a relay KA and a diode D2 are arranged in the relay circuit, and the first end of the relay KA is connected to the first end of the capacitor C2, the negative pole of the diode D1, and the diode D2 respectively. The negative pole of D2 is connected to the switch tube circuit; the second end of the relay KA is respectively connected to the second end of the capacitor C2, and the positive pole of the diode D2 is connected to the switch tube circuit, and the relay KA is connected to control the control switch KT.

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PUM

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Abstract

The invention discloses a protective circuit for current transformer function protection. The protective circuit comprises an alternating current input circuit, a relay circuit, a switch tube circuit, a filter circuit, a rectifier circuit and a protective coil circuit, wherein the alternating current input circuit is connected with the relay circuit; the relay circuit is connected with the switch tube circuit; the switch tube circuit is connected with the filter circuit; the filter circuit is connected with the rectifier circuit; the rectifier circuit is connected with the protective coil circuit; the relay circuit is used for controlling a contact which is connected with a protected circuit; a potentiometer W2, a control coil L1 and a control switch KT are arranged in the protective coil circuit. According to the protective circuit, the contact is tripped by making the relay circuit act on the contact, so that the power supply of a motor is cut off, and functions of overload protection, prompt braking and open-phase protection can be achieved.

Description

technical field [0001] The invention relates to the fields of signal processing technology, protection circuit technology and the like, and specifically relates to a protection circuit for functional protection of a current transformer. Background technique [0002] The principle of current transformer is made according to the principle of transformer. A current transformer consists of a closed core and windings. Its primary side winding has few turns, and it is connected in series with the current line that needs to be measured, so it often has all the current of the line flowing, and the secondary side winding has more turns, and is connected in series in the measuring instrument and protection circuit. When the current transformer is working, its secondary side circuit is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit. Th...

Claims

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Application Information

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IPC IPC(8): H02H7/04H02H9/04
CPCH02H7/042H02H9/04
Inventor 姚清群
Owner 成都云士达科技有限公司