CN212849984U - Monitoring device for high-low voltage power transmission and distribution equipment - Google Patents
Monitoring device for high-low voltage power transmission and distribution equipment Download PDFInfo
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- CN212849984U CN212849984U CN202022027811.4U CN202022027811U CN212849984U CN 212849984 U CN212849984 U CN 212849984U CN 202022027811 U CN202022027811 U CN 202022027811U CN 212849984 U CN212849984 U CN 212849984U
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Abstract
The utility model discloses a monitoring device of high-low voltage power transmission and distribution equipment, the state parameter of high-low voltage power transmission and distribution equipment that the sensor group detected exports after differential amplifier amplifies all the way, another way adds pin 2 to photoelectric coupler OP1, when pin 2 signal of photoelectric coupler OP1 is zero, also when there is no signal, photoelectric coupler OP1 switches on, triode Q1 switches on, signal feedback to differential amplifier after sensor detected signal and differential amplifier amplify, interference coupling voltage when correcting the inherent offset voltage of sensor and receiving signal, later enter resistance R4, resistance R5, the resistance between the leakage source of field effect transistor Q1, the amplifier that operational amplifier AR3 constitutes is controllable to amplify, transmit to the controller after compensating wire transmission loss, wherein controllable amplified range is amplified by the wire resistance signal through the amplifier, feedback to the grid of field effect transistor Q1, the drain-source resistance of the field effect transistor Q1 is controlled, and the amplitude of controllable amplification is controlled.
Description
Technical Field
The utility model relates to a power transmission and distribution control field especially relates to high-low voltage power transmission and distribution equipment's monitoring device.
Background
The power transmission and distribution equipment realizes all equipment related to power transmission and distribution of power grid balanced operation from power generation to power utilization through voltage level conversion, power state adjustment, power grid protection, metering and control measures.
The monitoring of the existing high-low voltage power transmission and distribution equipment is generally provided with a sensor group for detecting the state parameters of the high-low voltage power transmission and distribution equipment, the state parameters are transmitted to a controller through a lead, the controller is transmitted to a monitoring end through a wired or wireless mode, but when the state parameters of the high-low voltage power transmission and distribution equipment are detected by the sensor, an error exists during receiving, and when the state parameters of the high-low voltage power transmission and distribution equipment are transmitted to the controller through the lead, loss exists, and the data received by the controller is inaccurate.
Disclosure of Invention
To the above situation, in order to overcome the defects of the prior art, the present invention is directed to a monitoring device for high and low voltage power transmission and distribution equipment, which effectively solves the problem of inaccurate data received by a controller.
The technical scheme for solving the problem is that the high-voltage and low-voltage power transmission and distribution equipment comprises high-voltage and low-voltage power transmission and distribution equipment, a sensor group and a controller, and state parameters of the high-voltage and low-voltage power transmission and distribution equipment detected by the sensor group are transmitted to the controller.
Preferably, the correction circuit comprises a resistor R1, a photocoupler OP1, one end of a resistor R1, a pin 2 of a photocoupler OP1 connected with the state parameters of the high-low voltage power transmission and distribution equipment detected by the sensor group, the other end of a resistor R1 connected with the non-inverting input end of an operational amplifier AR1, the inverting input end of the operational amplifier AR1 connected with one end of a grounding resistor R2, one end of a resistor R3, and the other end of a resistor R11, the output end of the operational amplifier AR1 connected with the other end of a resistor R3 and the non-inverting input end of an operational amplifier AR2, the output end of the operational amplifier AR1 is the correction circuit output signal, a pin 1 of the photocoupler OP1 is connected with a power supply +0.7V, a pin 4 of the photocoupler OP1 is connected with a power supply +5V, a pin 3 of the photocoupler OP1 is connected with the base of a triode Q42 through a resistor R11, a collector of a triode, the emitter of the transistor Q1 is connected to the inverting input terminal of the operational amplifier AR2, and the output terminal of the operational amplifier AR2 is connected to one end of the resistor R11.
The utility model discloses the state parameter of high-low pressure power transmission and distribution equipment that sensor group detected, export after the differential amplifier enlargies all the way, another way adds pin 2 of photoelectric coupler OP1, when pin 2 signal of photoelectric coupler OP1 is zero also when no signal, photoelectric coupler OP1 switches on, triode Q1 switches on, signal feedback to the differential amplifier after subtraction operation after sensor detected signal and differential amplifier enlargies, realize when the sensor does not have detected signal, the differential amplifier output is zero, correct the inherent offset voltage of sensor and disturb coupling voltage when receiving signal, later get into resistance R4, resistance R5, the resistance between the leakage sources of field effect tube Q1, the amplifier controllable of operational amplifier AR3 constitution is enlargied, transmit the controller after compensating the wire transmission loss, wherein controllable amplified range is through the amplifier by the wire signal of resistance appearance measurement, the feedback is sent to the grid of the field effect transistor Q1, the resistance value between the drain and the source of the field effect transistor Q1 is controlled, and the amplitude of controllable amplification is further controlled, namely, the amplification of corresponding amplitude is carried out according to the transmission attenuation of wires of different degrees.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
In the first embodiment, the monitoring apparatus for high and low voltage power transmission and distribution equipment comprises high and low voltage power transmission and distribution equipment, a sensor group and a controller, wherein the state parameters of the high and low voltage power transmission and distribution equipment detected by the sensor group are transmitted to the controller, the state parameters of the high and low voltage power transmission and distribution equipment detected by the sensor group firstly enter a correction circuit, one path of the state parameters enters the non-inverting input end of an operational amplifier AR1 through a resistor R1, is amplified by a differential amplifier composed of an operational amplifier AR1, a resistor R1 and a resistor R3 and then is output, the other path of the state parameters is added to a pin 2 of a photoelectric coupler OP1, when a pin 2 signal of a photoelectric coupler OP1 is zero, namely no signal, the photoelectric coupler OP1 is conducted, a triode Q1 is conducted, a signal detected by a sensor and the signal amplified by the differential amplifier AR2 are subtracted and then fed back to the inverting input end of the operational amplifier AR1 through the resistor R11, the output of the differential amplifier is zero, the inherent offset voltage of the sensor and the interference coupling voltage during signal receiving are corrected, the corrected signal enters a controllable gain amplifying circuit for controllable amplification, and the signal is transmitted to a controller after the transmission loss of a wire is compensated, wherein the amplitude of the controllable amplification is amplified by a wire resistance signal measured by a resistor instrument through an amplifier consisting of an operational amplifier AR4 and a resistor R8-a resistor R10, and then is fed back to the grid electrode of a field effect tube Q1 through a resistor R7, the resistance value between drain sources of the field effect tube Q1 is controlled, the wire resistance signal is large, the smaller the resistance between drain sources of the field effect tube Q1 is, the smaller the input resistance of the operational amplifier AR3 is, the amplification multiple of the amplifier is larger, the amplitude of the controllable amplification is controlled, the amplification of corresponding amplitude is performed according to different degrees of wire transmission attenuation, and the signal is transmitted.
In the second embodiment, on the basis of the first embodiment, the correction circuit receives the state parameters of the high-voltage and low-voltage power transmission and distribution equipment detected by the sensor group, that is, the sensor detection signals (for example, the working voltage, current, and power parameters of the generator and the transformer at the high-voltage power transmission and distribution site, and the frequency, voltage, current, power, insulation, heat dissipation, and other parameters of the power distribution cabinet, which are detected by corresponding sensors, and are not described in detail herein), one path enters the non-inverting input terminal of the operational amplifier AR1 through the resistor R1, is amplified by the differential amplifier composed of the operational amplifier AR1, the resistor R1 and the resistor R3, and the other path is added to the pin 2 of the photocoupler OP1, when the signal at the pin 2 of the photocoupler OP1 is zero, that is a no signal, since the pin 1 of the photocoupler OP1 is connected to the power supply of 0.7V, the photocoupler OP1 is turned, the sensor detection signal and the signal amplified by the differential amplifier respectively enter an inverting input end and an non-inverting input end of an operational amplifier AR2, the operational amplifier AR2 performs subtraction operation and then feeds back the signal to the inverting input end of the operational amplifier AR1 through a resistor R11, the output of the differential amplifier is zero when no detection signal exists in the sensor, the inherent offset voltage of the sensor and the interference coupling voltage detected by a sensor group are corrected, the sensor detection circuit comprises a resistor R1 and a photoelectric coupler OP1, one end of the resistor R1 and a pin 2 of the photoelectric coupler OP1 are connected with state parameters of high-low voltage power transmission and distribution equipment detected by the sensor group, the other end of the resistor R1 is connected with the non-inverting input end of an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is respectively connected with one end of a grounding resistor R2, one end of the resistor R3 and the other end of the resistor R11, the, The non-inverting input end of the operational amplifier AR2, the output end of the operational amplifier AR1 is a correction circuit output signal, a pin 1 of a photoelectric coupler OP1 is connected with +0.7V of a power supply, a pin 4 of a photoelectric coupler OP1 is connected with +5V of the power supply, a pin 3 of the photoelectric coupler OP1 is connected with a base electrode of a triode Q1 through a resistor R11, a collector of the triode Q1 is connected with one end of a resistor R1, an emitter of the triode Q1 is connected with the inverting input end of the operational amplifier AR2, and the output end of the operational amplifier AR2 is connected with one end of the resistor R11.
Third embodiment, on the basis of the first embodiment, the controllable gain amplifying circuit receives the signal amplified by the differential amplifier, the signal enters an amplifier composed of a resistor R4, a resistor R5, a drain-source resistance value of a field effect transistor Q1, and an operational amplifier AR3, is controllably amplified, compensates for the transmission loss of the wire, and then is transmitted to the controller, wherein the controllably amplified amplitude is amplified by the amplifier composed of the operational amplifier AR4, the resistor R8-the resistor R10, and is fed back to the gate of the field effect transistor Q1 through the resistor R7, the drain-source resistance value of the field effect transistor Q1 is controlled, the wire resistance value signal is large, the smaller the drain-source resistance value of the field effect transistor Q1 is, the smaller the input resistance of the operational amplifier AR3 is, the larger the amplification factor of the amplifier is, the controllably amplified amplitude is further controlled, that is, the amplification of corresponding amplitude is performed according to different degrees of wire transmission, the circuit comprises a resistor R4, one end of the resistor R4 is connected with the output end of an operational amplifier AR1, the other end of the resistor R4 is connected with the drain electrode of a field effect tube Q1, the grid electrode of the field effect tube Q1 is respectively connected with one end of the resistor R7 and the anode of a grounding electrolytic capacitor E2, the other end of the resistor R7 is respectively connected with the output end of the operational amplifier AR4 and one end of the resistor R8, the inverting input end of the operational amplifier AR4 is connected with the ground through a resistor R10, the non-inverting input end of the operational amplifier AR4 is respectively connected with one end of a resistor R9 and the other end of a resistor R8, the other end of the resistor R9 is connected with a detected wire resistance signal, the source electrode of the field effect tube Q1 is respectively connected with the inverting input end of the operational amplifier AR3 and one end of the resistor R5, the non-inverting input end of.
When the utility model is used in detail, the state parameters of the high-low voltage power transmission and distribution equipment detected by the sensor group, namely the sensor detection signal, enter the non-inverting input end of the operational amplifier AR1 through the resistor R1 all the way, and are output after being amplified by the differential amplifier composed of the operational amplifier AR1 and the resistor R1-resistor R3, and the other way is added to the pin 2 of the photoelectric coupler OP1, when the pin 2 signal of the photoelectric coupler OP1 is zero, namely no signal, because the pin 1 of the photoelectric coupler OP1 is connected with 0.7V, the photoelectric coupler OP1 is conducted, the triode Q1 is conducted, the sensor detection signal and the signal after being amplified by the differential amplifier respectively enter the inverting input end and the non-inverting input end of the operational amplifier AR2, the inverting input end of the operational amplifier AR 11 is fed back to the inverting input end of the operational amplifier AR1 after the subtraction operation of the operational amplifier AR2, when no detection signal is realized, the inherent offset voltage of the sensor and the interference coupling voltage when receiving signals are corrected, then the corrected signal enters an amplifier consisting of a resistor R4, a resistor R5, the drain-source resistance value of a field effect transistor Q1 and an operational amplifier AR3 to be controllably amplified, the signal of the wire resistance value measured by a resistance instrument is transmitted to a controller after the transmission loss of the wire is compensated, the controllably amplified amplitude is amplified by the amplifier, the signal of the wire resistance value is fed back to a grid electrode of the field effect transistor Q1, the drain-source resistance value of the field effect transistor Q1 is controlled, the controllably amplified amplitude is further controlled, and the amplification of corresponding amplitude is carried out according to the transmission attenuation of the wires of different degrees.
Claims (3)
1. The monitoring device of the high-low voltage power transmission and distribution equipment comprises the high-low voltage power transmission and distribution equipment, a sensor group and a controller, wherein the state parameters of the high-low voltage power transmission and distribution equipment detected by the sensor group are transmitted to the controller.
2. The monitoring device of claim 1, wherein the rectification circuit comprises a resistor R1 and a photocoupler OP1, one end of the resistor R1 and the status parameters of the high and low voltage power transmission and distribution equipment detected by the sensor group connected to pin 2 of the photocoupler OP1, the other end of the resistor R1 is connected to the non-inverting input end of an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected to one end of a ground resistor R2, one end of a resistor R3 and the other end of a resistor R11, the output end of the operational amplifier AR1 is connected to the other end of the resistor R3 and the non-inverting input end of the operational amplifier AR2, the output end of the operational amplifier AR1 is the rectification circuit output signal, pin 1 of the photocoupler OP1 is connected to the power supply +0.7V, pin 4 of the photocoupler OP1 is connected to the power supply +5V, pin 3 of the photocoupler OP1 is connected to the base of the transistor Q1 through the resistor R11, the collector of the transistor Q1 is connected to one end of the resistor R1, the emitter of the transistor Q1 is connected to the inverting input terminal of the operational amplifier AR2, and the output terminal of the operational amplifier AR2 is connected to one end of the resistor R11.
3. The monitoring device of claim 1, wherein the controllable gain amplifying circuit comprises a resistor R4, one end of the resistor R4 is connected to the output terminal of the operational amplifier AR1, the other end of the resistor R4 is connected to the drain of the FET Q1, the gate of the FET Q1 is connected to one end of the resistor R7 and the positive electrode of the grounded electrolytic capacitor E2, the other end of the resistor R7 is connected to the output terminal of the operational amplifier AR4 and one end of the resistor R8, the inverting input terminal of the operational amplifier AR4 is connected to the ground through the resistor R10, the non-inverting input terminal of the operational amplifier AR4 is connected to one end of the resistor R9 and the other end of the resistor R8, the other end of the resistor R9 is connected to the detected wire resistance signal, the source of the FET Q1 is connected to the inverting input terminal of the operational amplifier AR3 and one end of the resistor R5, and the non-inverting input terminal of the operational amplifier AR3 is, the other end of the resistor R5 and the output of the operational amplifier AR3 are connected to the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022027811.4U CN212849984U (en) | 2020-09-16 | 2020-09-16 | Monitoring device for high-low voltage power transmission and distribution equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022027811.4U CN212849984U (en) | 2020-09-16 | 2020-09-16 | Monitoring device for high-low voltage power transmission and distribution equipment |
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| Publication Number | Publication Date |
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| CN212849984U true CN212849984U (en) | 2021-03-30 |
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| CN202022027811.4U Active CN212849984U (en) | 2020-09-16 | 2020-09-16 | Monitoring device for high-low voltage power transmission and distribution equipment |
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| CN (1) | CN212849984U (en) |
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