CN213302358U - Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit - Google Patents

Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit Download PDF

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Publication number
CN213302358U
CN213302358U CN202021548957.7U CN202021548957U CN213302358U CN 213302358 U CN213302358 U CN 213302358U CN 202021548957 U CN202021548957 U CN 202021548957U CN 213302358 U CN213302358 U CN 213302358U
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China
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circuit
operational amplifier
pin
resistor
rogowski coil
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CN202021548957.7U
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Inventor
李春海
李世敏
刘朋飞
陈贺
翟志国
刘海涛
芦斌
刘晓龙
崔振伟
支智勇
袁琳琳
郭殿聪
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Shijiazhuang Kelin Internet Of Things Technology Co ltd
Shijiazhuang Kelin Electric Co Ltd
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Shijiazhuang Kelin Internet Of Things Technology Co ltd
Shijiazhuang Kelin Electric Co Ltd
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Priority to CN202021548957.7U priority Critical patent/CN213302358U/en
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Abstract

The Rogowski coil signal integration operation circuit used in the low-voltage shunt monitoring unit belongs to the technical field of power current measurement, is arranged between a Rogowski coil current transformer and an AD conversion circuit in the monitoring unit, and comprises an integration circuit and an operational amplification circuit which are sequentially connected; an alternating current signal generated by the current to be measured through induction of the Rogowski coil current transformer is input into the integrating circuit and the operational amplifying circuit, and a signal output by the operational amplifying circuit is input into the AD conversion circuit. By improving the circuit structure, the phase of the signal waveform processed by the integrating circuit is consistent with the phase of the current to be measured, and the amplitude of the signal waveform processed by the operational amplifier circuit is suitable for measurement of the AD conversion circuit.

Description

Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit
Technical Field
The utility model belongs to the technical field of the power current measurement, a luo shi coil signal integral operation circuit who uses among the low pressure monitoring unit along separate routes is related to.
Background
The low-voltage shunt monitoring terminal is mainly installed in a switching station, a low-voltage outgoing line of a distribution transformer room, a branch box and a user meter box cable are suitable for 400V electric quantity monitoring and fault monitoring, running current on a low-voltage line can be collected, voltage and active power and reactive power of a calculation line can be collected, and the low-voltage shunt monitoring terminal is matched with an intelligent distribution transformer terminal to realize secondary equipment integrating functions of power supply information collection of a distribution transformer area, equipment state monitoring, communication networking, local analysis decision, main station communication, cooperative calculation and the like, and the network topology of a solid power grid and fault point analysis and prediction are realized, so that active operation and maintenance of the secondary side of the power grid and intelligent operation and.
The Rogowski coil is used as a non-magnetic core alternating current sensor, has natural advantages for measuring high frequency and large current, can be made into a flexible coil, and can still realize measurement under special current measurement conditions, and the characteristic of the Rogowski coil is very suitable for measuring protection current and is increasingly applied to protection measurement scenes. However, the output signal of the rogowski coil is the differential of the signal to be measured, and the phase of the input signal and the phase of the output signal are deviated by 90 degrees, so that the output signal needs to be subjected to integration processing to restore the real current waveform to be measured. The accuracy of the integrating circuit and the amplifying circuit directly affects the measurement accuracy of the current, power factor and the like of the power system, so that the finding of the integrating amplifying circuit with the phase consistent with the current to be measured and the amplitude suitable for acquisition is particularly important.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a luo shi coil signal integral operation circuit who uses among the low pressure monitoring unit along separate routes, through improving circuit structure, make the signal waveform phase place after the integrated circuit handles unanimous with the electric current phase place that awaits measuring, make the signal waveform amplitude after the circuit processing is put to fortune simultaneously and be fit for AD converting circuit and measure.
The utility model adopts the technical proposal that: the Rogowski coil signal integration operation circuit used in the low-voltage shunt monitoring unit is arranged between a Rogowski coil current transformer and an AD conversion circuit in the monitoring unit and comprises an integration circuit and an operational amplification circuit which are sequentially connected; an alternating current signal generated by the current to be measured through induction of the Rogowski coil current transformer is input into the integrating circuit and the operational amplifying circuit, and a signal output by the operational amplifying circuit is input into the AD conversion circuit.
Further, the AD conversion circuit is a single-power AD conversion chip.
Furthermore, the rogowski coil signal integration operation circuit further comprises a high-pass filter circuit arranged behind the operational amplification circuit; and the signal output by the operational amplification circuit enters an AD conversion circuit after passing through a high-pass filter circuit, and the AD conversion circuit is a dual-power AD conversion chip.
Furthermore, the high-pass filter circuit comprises a capacitor C3 and a resistor R9 which are sequentially connected in series, one end of the resistor R9 is connected with GND, the output end of the high-pass filter circuit is arranged between the capacitor C3 and the resistor R9, and the input end of the capacitor C3 is connected with the operational amplifier circuit.
Furthermore, the integrating circuit comprises an integrated operational amplifier U1, a resistor R4 connected between the pin 3 of the integrated operational amplifier U1 and VCC, a resistor R3 connected between the pin 3 of the integrated operational amplifier U1 and GND, a resistor R1 connected to the pin 2 of the integrated operational amplifier U1, a resistor R2 and a capacitor C1, wherein two ends of the resistor R2 and two ends of the capacitor C1 are respectively connected between the pin 2 and the pin 6 of the integrated operational amplifier U1 and are arranged in parallel, and the pin 4 and the pin 7 of the integrated operational amplifier U1 are respectively connected with GND and VCC; the input end of the resistor R1 is connected with the Rogowski coil current transformer, and the pin 6 of the integrated operational amplifier U1 is connected with the input end of the operational amplifier circuit.
Further, the operational amplifier circuit comprises an integrated operational amplifier U2, a capacitor C2 connected between a pin 3 of the integrated operational amplifier U2 and a pin 6 of the integrated operational amplifier U1, a resistor R8 connected between the pin 3 of the integrated operational amplifier U2 and VCC, a resistor R7 connected between the pin 3 of the integrated operational amplifier U2 and GND, a resistor R5 connected between a pin 2 of the integrated operational amplifier U2 and GND, and a resistor R6 with two ends connected between the pin 2 and the pin 6 of the integrated operational amplifier U1, wherein the pin 4 and the pin 7 of the integrated operational amplifier U2 are connected with GND and VCC respectively.
The utility model discloses the beneficial effect who produces: by improving the circuit structure, the phase of the signal waveform processed by the integrating circuit is consistent with the phase of the current to be measured, and the amplitude of the signal waveform processed by the operational amplifier circuit is suitable for measurement of the AD conversion circuit.
Drawings
Fig. 1 is a schematic block diagram of the circuit structure of the present invention;
fig. 2 is a schematic diagram of the circuit of fig. 1.
Detailed Description
Referring to fig. 1-2, a rogowski coil signal integration operation circuit used in the low-voltage shunt monitoring unit is arranged between a rogowski coil current transformer and an AD conversion circuit in the monitoring unit, and the rogowski coil signal integration operation circuit comprises an integration circuit 31 and an operational amplification circuit 32 which are connected in sequence; an alternating current signal generated by the current to be measured induced by the rogowski coil current transformer is input to the integrating circuit 31 and the operational amplifying circuit 32, and a signal output from the operational amplifying circuit 32 is input to the AD conversion circuit.
The AD conversion circuit is a single-power AD conversion chip.
The Rogowski coil signal integration operation circuit further comprises a high-pass filter circuit 33 arranged behind the operational amplification circuit 32; the signal output by the operational amplifier circuit 32 enters an AD conversion circuit, which is a dual-power AD conversion chip, after passing through a high-pass filter circuit 33.
The high-pass filter circuit 33 comprises a capacitor C3 and a resistor R9 which are sequentially connected in series, one end of the resistor R9 is connected with GND, the output end of the high-pass filter circuit 33 is arranged between the capacitor C3 and the resistor R9, and the input end of the capacitor C3 is connected with the operational amplifier circuit 32. The signal after passing through the operational amplifier circuit 32 is connected to a high-pass filter circuit 33 to filter out the direct current component, and then the alternating current signal is input to a dual-power AD sampling chip 34 capable of collecting the alternating current signal. Or the signal superposed with the direct current component is input to a single power supply AD sampling chip which can only collect direct current signals without passing through a high-pass filter circuit.
The integrating circuit 31 comprises an integrated operational amplifier U1, a resistor R4 connected between a pin 3 of the integrated operational amplifier U1 and VCC, a resistor R3 connected between the pin 3 of the integrated operational amplifier U1 and GND, a resistor R1 connected to a pin 2 of the integrated operational amplifier U1, a resistor R2 and a capacitor C1, wherein two ends of the resistor R2 and two ends of the capacitor C1 are respectively connected between a pin 2 and a pin 6 of the integrated operational amplifier U1 and are arranged in parallel, and a pin 4 and a pin 7 of the integrated operational amplifier U1 are respectively connected with GND and VCC; the input end of the resistor R1 is connected with the Rogowski coil current transformer, and the pin 6 of the integrated operational amplifier U1 is connected with the input end of the operational amplifier circuit 32.
The operational amplifier circuit 32 comprises an integrated operational amplifier U2, a capacitor C2 connected between a pin 3 of the integrated operational amplifier U2 and a pin 6 of the integrated operational amplifier U1, a resistor R8 connected between the pin 3 of the integrated operational amplifier U2 and VCC, a resistor R7 connected between the pin 3 of the integrated operational amplifier U2 and GND, a resistor R5 connected between a pin 2 of the integrated operational amplifier U2 and GND, and a resistor R6 with two ends respectively connected between the pin 2 and the pin 6 of the integrated operational amplifier U1, wherein the pin 4 and the pin 7 of the integrated operational amplifier U2 are respectively connected with GND and VCC. The signal after passing through the integrating circuit 31 is input to a capacitor C2, and after the direct current component is filtered, the signal is amplified to a voltage range suitable for acquisition through an integrated circuit U2 and is output to a high-pass filter circuit 33.
The integration circuit integrates the signal converted by the Rogowski coil current transformer to make the phase consistent with the current to be measured, and simultaneously raises the level of the positive and negative bipolar alternating current signal to make the signal into a unipolar direct current signal. The signal after the integration and the raising is input to an operational amplifier circuit for amplification through a blocking capacitor, and meanwhile, the alternating current signal after the blocking is raised again to be a direct current signal with only a positive level, and the signal can directly enter a single-power-supply AD conversion chip for measurement or enter a double-power-supply AD conversion chip for measurement after high-pass filtering.

Claims (4)

1. Rogowski coil signal integral operation circuit used in the low-voltage shunt monitoring unit is arranged between a Rogowski coil current transformer and an AD conversion circuit in the monitoring unit, and is characterized in that: the Rogowski coil signal integration operation circuit comprises an integration circuit (31) and an operational amplification circuit (32) which are sequentially connected; an alternating current signal generated by the current to be measured through induction of the Rogowski coil current transformer is input into an integrating circuit (31) and an operational amplifying circuit (32), and a signal output by the operational amplifying circuit (32) is input into an AD conversion circuit;
the integrating circuit (31) comprises an integrated operational amplifier U1, a resistor R4 connected between a pin 3 of the integrated operational amplifier U1 and VCC, a resistor R3 connected between the pin 3 of the integrated operational amplifier U1 and GND, a resistor R1 connected to a pin 2 of the integrated operational amplifier U1, a resistor R2 and a capacitor C1, wherein two ends of the resistor R2 and two ends of the capacitor C1 are respectively connected between a pin 2 and a pin 6 of the integrated operational amplifier U1 and are arranged in parallel, and a pin 4 and a pin 7 of the integrated operational amplifier U1 are respectively connected with GND and VCC; the input end of the resistor R1 is connected with a Rogowski coil current transformer, and the pin 6 of the integrated operational amplifier U1 is connected with the input end of an operational amplifier circuit (32);
the operational amplifier circuit (32) comprises an integrated operational amplifier U2, a capacitor C2 connected between a pin 3 of the integrated operational amplifier U2 and a pin 6 of the integrated operational amplifier U1, a resistor R8 connected between the pin 3 of the integrated operational amplifier U2 and VCC, a resistor R7 connected between the pin 3 of the integrated operational amplifier U2 and GND, a resistor R5 connected between a pin 2 of the integrated operational amplifier U2 and GND, and a resistor R6 with two ends respectively connected between the pin 2 and the pin 6 of the integrated operational amplifier U1, wherein the pin 4 and the pin 7 of the integrated operational amplifier U2 are respectively connected with GND and VCC.
2. The rogowski coil signal integration and operation circuit for use in a low voltage shunt monitoring unit according to claim 1, wherein: the AD conversion circuit is a single-power AD conversion chip.
3. The rogowski coil signal integration and operation circuit for use in a low voltage shunt monitoring unit according to claim 1, wherein: the Rogowski coil signal integration operation circuit further comprises a high-pass filter circuit (33) arranged behind the operational amplification circuit (32); the signal output by the operational amplification circuit (32) enters an AD conversion circuit after passing through a high-pass filter circuit (33), and the AD conversion circuit is a dual-power AD conversion chip.
4. The rogowski coil signal integration and operation circuit for use in a low voltage shunt monitoring unit according to claim 3, wherein: the high-pass filter circuit (33) comprises a capacitor C3 and a resistor R9 which are sequentially connected in series, one end of the resistor R9 is connected with GND, the output end of the high-pass filter circuit (33) is arranged between the capacitor C3 and the resistor R9, and the input end of the capacitor C3 is connected with the operational amplifier circuit (32).
CN202021548957.7U 2020-07-30 2020-07-30 Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit Active CN213302358U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021548957.7U CN213302358U (en) 2020-07-30 2020-07-30 Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021548957.7U CN213302358U (en) 2020-07-30 2020-07-30 Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit

Publications (1)

Publication Number Publication Date
CN213302358U true CN213302358U (en) 2021-05-28

Family

ID=76023503

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021548957.7U Active CN213302358U (en) 2020-07-30 2020-07-30 Rogowski coil signal integration operation circuit used in low-voltage shunt monitoring unit

Country Status (1)

Country Link
CN (1) CN213302358U (en)

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