CN113014244B - Ring main unit operation detection device - Google Patents
Ring main unit operation detection device Download PDFInfo
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- CN113014244B CN113014244B CN202110279122.9A CN202110279122A CN113014244B CN 113014244 B CN113014244 B CN 113014244B CN 202110279122 A CN202110279122 A CN 202110279122A CN 113014244 B CN113014244 B CN 113014244B
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Abstract
The application relates to a ring main unit operation detection device, which comprises a signal detection input circuit, a signal operation processing circuit and an output filter driving circuit. The looped netowrk cabinet operation detection device of this design takes the modularized design scheme, utilizes the mode of stacking blocks to set up intelligent looped netowrk cabinet, can solve design cycle length, with high costs, the low problem of later stage extension inclusion when customizing the looped netowrk cabinet according to the scene. The signal detection input circuit can receive the state of the ring main unit alternating current in real time in the running state, and meanwhile, the transient diode is used for protecting the front end circuit, so that high-integrity signal detection and primary circuit protection can be realized. The signal operation processing circuit can be divided into two parts, which is beneficial to signal judgment and can improve the accuracy. The output filter driving circuit needs to filter noise and clutter superposed in the circuit processing process when outputting, can improve the high accuracy of output signals, and simultaneously realizes stable and reliable real-time monitoring of the ring main unit.
Description
Technical Field
The application relates to the field of electric power detection and ring main units, in particular to a ring main unit operation detection device.
Background
In the aspect of power supply points of cities and villages, the integrated ring main unit integrating primary equipment and secondary equipment is widely applied to power distribution networks of various scales, and although the ring main unit has the advantages of small occupied area, quickness in installation, convenience in maintenance, high reliability and the like, the number of lines required by the nodes of the ring main unit is different under different application environments. The traditional ring main unit design is customized according to the number of on-site lines, and has the fundamental defects of long period, high cost, difficulty in later expansion and the like.
Disclosure of Invention
Problem (A)
1. The ring main unit has strong design particularity and weak cable arrangement planning adaptability.
2. The ring main unit design circuit has weak functional resolution and complex structure.
3. The ring main unit is difficult to have a standardized design flow, high in cost and low in efficiency.
(II) technical scheme
To solve the technical problem, the application provides a ring main unit operation detection device, which comprises a signal detection input circuit, a signal operation processing circuit and an output filter driving circuit.
As shown in fig. 1, a signal amplification circuit diagram in the prior art is designed, in principle, a closed-loop characteristic of a comparator is utilized to realize proportional amplification of an output signal and an input signal, amplification can be adjusted by controlling a resistance ratio of two sides of an input and an output, however, since an amplifier has a certain defect, self-oscillation easily occurs, and a certain degree of interference is easily brought to the output signal.
As shown in fig. 2, in a signal comparison circuit diagram in the prior art, in design principle, an open-loop characteristic of a comparator is utilized to compare two input voltage signals, and an output result is converted into two voltage or current signals with the same magnitude but opposite directions, so as to distinguish the comparison result of the signals, and a more complicated circuit is subsequently required to solve and utilize the comparison result signal, thereby increasing the complexity of the circuit.
The signal detection input circuit can receive the state of the ring main unit alternating current in the running state, and meanwhile, the transient diode D6 is used for protecting the front end circuit, so that high-integrity signal detection and primary circuit voltage protection are achieved. The signal is transmitted by current mutual inductance in primary and secondary coils of a transformer TQ1, and then is subjected to preliminary resistance-capacitance filtering through a resistor R4 and a capacitor C2, wherein a Schottky diode D4 prevents high current from breaking through the capacitor C2, the signal is subjected to high voltage limitation through a transient diode group U2, a protection circuit is used for protecting the signal, then the signal is input to an amplifier U1A through a resistor R6, the signal is subjected to preliminary processing, common-mode signals of a signal input end INPUTA and a signal input end INPUTB are eliminated, and finally the output signal is output to a next-stage signal operation processing module through a resistor R8.
The signal operation processing circuit can be divided into two major parts, namely a signal amplification process and a signal judgment process. The signal amplification mainly amplifies weak signals input by the front end, which is beneficial to signal judgment and can improve the accuracy. The signal is processed by the first-stage signal detection circuit, and the signal is relatively weak, so that the judgment of the following signal is not facilitated. The signal transmitted by the detection circuit passes through an amplification module taking an amplifier U1B as a core, the signal needing to be judged is basically amplified, then the signal is output to a diode D9, and whether the amplification of the signal exceeds a rated threshold value is detected and judged. After the signal is amplified, the signal enters a second part of the operation processing circuit, namely judgment, the part mainly utilizes a transistor Q4 and a double-cascade triode Q1 to carry out double judgment on the threshold value, and meanwhile, the threshold value of the signal judgment can be controlled by adjusting a slide rheostat R19, so that the threshold value limit of the monitoring of the ring main unit can be adjusted according to different regions and environments, and the ring main unit has higher applicability and practicability.
The output filter driving circuit is mainly transmitted in the form of alternating current, so that noise and clutter superposed in the circuit processing process need to be filtered during output. After the previous input and judgment, the result of the current operation state of the ring main unit can be obtained, and at this time, the interference amount in the judgment result needs to be filtered. Firstly, the judgment result passes through a symmetrical resistance-capacitance filter circuit, wherein a diode D10 and a diode D14 filter weak interference signals in alternating current. And then, the signals are connected to the base electrodes of a PNP triode Q3 and a triode Q6 to further judge the signals, the output results are input into a transistor Q2 and a transistor Q5 to carry out constant value amplification on the signals, the driving capability of the signals is enhanced, and finally the two signals are output through a line and a resistor R11.
(III) advantageous effects
The application provides looped netowrk cabinet operation detection device takes the modularized design scheme, utilizes the mode of stacking blocks to set up intelligent looped netowrk cabinet, can solve design cycle length, with high costs, the low problem of later stage extension inclusion when customizing the looped netowrk cabinet according to the scene. Firstly, a modular design is adopted, so that the design and the production are more standardized. Secondly, in the aspect of circuit design, carry out spatial arrangement according to functional module, improved the ability of later stage dilatation. And finally, a standardized design flow is prepared according to the circuit function, so that the cost can be reduced, the reliability of the circuit can be improved, and the efficiency can be improved.
Drawings
Fig. 1 is a schematic diagram of a signal amplification circuit of the prior art.
Fig. 2 is a schematic diagram of a signal comparison circuit of the prior art.
Fig. 3 is a schematic circuit diagram of the present application.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 3, the present application provides a ring main unit operation detection apparatus, which includes a signal detection input circuit, a signal operation processing circuit, and an output filter driving circuit.
The signal detection input circuit can receive the state of the ring main unit alternating current in the running state, and meanwhile, the transient diode D6 is used for protecting the front end circuit, so that high-integrity signal detection and primary circuit voltage protection are achieved. The signal is transmitted by current mutual inductance in primary and secondary coils of a transformer TQ1, and then is subjected to preliminary resistance-capacitance filtering through a resistor R4 and a capacitor C2, wherein a Schottky diode D4 prevents high current from breaking through the capacitor C2, the signal is subjected to high voltage limitation through a transient diode group U2, a protection circuit is used for protecting the signal, then the signal is input to an amplifier U1A through a resistor R6, the signal is subjected to preliminary processing, common-mode signals of a signal input end INPUTA and a signal input end INPUTB are eliminated, and finally the output signal is output to a next-stage signal operation processing module through a resistor R8.
Specifically, in the signal detection input circuit, one end of the primary coil side of the transformer TQ1 is connected to the input port INPUTA, and the other end is connected to the input port INPUTB, one end of the secondary coil side of the transformer TQ1 is connected to the cathode of the transient diode D6, and the other end is connected to the anode of the transient diode D6, one end of the resistor R4 is connected to the cathode of the transient diode D6, and the other end is connected to one end of the capacitor C2, the cathode of the schottky diode D4, the No. 2 interface of the transient diode group U2, the No. 1 interface of the transient diode group U2, and one end of the resistor R6, the other end of the capacitor C2 is grounded, the anode of the schottky diode D4 is grounded, the other end of the resistor R6 is connected to the No. 2 interface of the amplifier U1A, the No. 3 interface of the amplifier U1A is connected to one end of the resistor R7 and the No. 3 interface of the transient diode group U2, and the other end of the resistor R7 is connected to the anode of the transient diode D6, the interface 8 of the amplifier U1A is connected to the high-level VCC, the interface 4 is grounded, the interface 1 is connected to one end of a resistor R8, one end of a resistor R3, and one end of a resistor R2, the other end of the resistor R2 is connected to the interface 2 of the amplifier U1A, the other end of the resistor R8 is connected to the anode of a diode D5, the other end of the resistor R3 is connected to the interface 3 of a diode group D2, and one end of a capacitor C3, the other end of the capacitor C3 is grounded, the interface 2 of the diode group D2 is connected to the anode of a diode D1, the cathode of a light-emitting diode D3, and one end of a capacitor C4, the other end of a capacitor C4 is connected to the interface 1 of the diode group D2 and the ground, one end of the resistor R1 is connected to the high-level VCC and the cathode of a diode D1, and the other end is connected to the anode of a light-emitting diode D3.
The signal operation processing circuit can be divided into two major parts, namely a signal amplification process and a signal judgment process. The signal amplification mainly amplifies weak signals input by the front end, which is beneficial to signal judgment and can improve the accuracy. The signal is processed by the first-stage signal detection circuit, and the signal is relatively weak, so that the judgment of the following signal is not facilitated. The signal transmitted by the detection circuit passes through an amplification module taking an amplifier U1B as a core, the signal needing to be judged is basically amplified, then the signal is output to a diode D9, and whether the amplification of the signal exceeds a rated threshold value is detected and judged. After the signal is amplified, the signal enters a second part of the operation processing circuit, namely judgment, the part mainly utilizes a transistor Q4 and a double-cascade triode Q1 to carry out double judgment on the threshold value, and meanwhile, the threshold value of the signal judgment can be controlled by adjusting a slide rheostat R19, so that the threshold value limit of the monitoring of the ring main unit can be adjusted according to different regions and environments, and the ring main unit has higher applicability and practicability.
Specifically, in the signal processing circuit, the cathode of the diode D5 is connected to the interface No. 5 of the amplifier U1B, one end of the resistor R5 is connected to the anode of the diode D5, the other end is connected to the anode of the capacitor C1, the cathode of the capacitor C1 is grounded, the interface No. 6 of the amplifier U1B is connected to the anode of the capacitor C5, one end of the resistor R9 and one end of the capacitor C6, the cathode of the capacitor C5 is grounded, the other end of the resistor R9 is grounded, the other end of the capacitor C6 is grounded, the interface No. 7 of the amplifier U1B is connected to the cathode of the transient diode D6 and the anode of the diode D9, the drain of the transistor Q4 is connected to one end of the bidirectional diode D11, one end of the resistor R15, the collector of the cascode transistor Q1 and one end of the resistor R10, the other end of the bidirectional diode D11 is connected to the transistor Q4, and the other end of the resistor R10 is connected to the high-level VCC, the other end of the resistor R15 is connected with one end of a capacitor C9, the other end of the capacitor C9 is connected with one end of a variable resistor R19, one end of a capacitor C13 and the base of a bipolar transistor Q1 respectively, the other end of the variable resistor R19 is connected with the cathode of a diode D9, the other end of the capacitor C13 is connected with the cathode of a diode D9, one end of the resistor R16 is connected with the cathode of a diode D9, the other end of the resistor R18 is connected with one end of the resistor R18, the cathode of a Schottky diode D12 and the gate of a transistor Q4 respectively, the other end of the resistor R18 is connected with the drain of a transistor Q4, the anode of the Schottky diode D12 is connected with the drain of a transistor Q4, and the emitter of a bipolar transistor Q1 is connected with the anodes of a diode D10 and a diode D14 respectively.
The output filter driving circuit mainly transmits in the form of alternating current, so noise and clutter superposed in the circuit processing process need to be filtered when outputting. After the previous input and judgment, the result of the current operation state of the ring main unit can be obtained, and at this time, the interference amount in the judgment result needs to be filtered. Firstly, the judgment result passes through a symmetrical resistance-capacitance filter circuit, wherein a diode D10 and a diode D14 filter weak interference signals in alternating current. And then, the signals are connected to the base electrodes of a PNP triode Q3 and a triode Q6 to further judge the signals, the output results are input into a transistor Q2 and a transistor Q5 to carry out constant value amplification on the signals, the driving capability of the signals is enhanced, and finally the two signals are output through a line and a resistor R11.
Specifically, in the output filter driving circuit, one end of a resistor R14 is connected to an anode of a diode D10, the other end of the resistor R14 is connected to one end of a capacitor C8 and a base of a PNP transistor Q3, the other end of a capacitor C8 is connected to one end of a capacitor C11, the other end of a capacitor C11 is connected to one end of a resistor R20 and a base of a transistor Q6, the other end of a capacitor R20 is connected to a cathode of a diode D14, one end of a resistor R17 is connected to a high level VCC, the other end of a resistor R17 is connected to one end of an inductor L2 and a collector of a transistor Q6, the other end of an inductor L2 is connected to one end of a capacitor C7 and a gate of a transistor Q5, the other end of a capacitor C7 is connected to a gate of a transistor Q2, one end of a resistor R12 is connected to a high level VCC, the other end of the inductor R3 is connected to an emitter of a transistor L1, and the other end of the inductor Q1 is connected to a gate of a transistor Q2, one end of the resistor R21 is grounded, the other end of the resistor R21 is connected to the collector of the PNP transistor Q3, the source end of the emitter transistor Q5 of the transistor Q6, and one end of the capacitor C12, the other end of the capacitor C12 is grounded, one end of the bidirectional diode D13 is grounded, the other end of the bidirectional diode D13 is connected to the source end of the transistor Q2 and the drain end of the transistor Q5, the cathode of the diode D8 is connected to the anode of the diode D7, the drain of the transistor Q5, and one end of the resistor R11, the other end of the resistor R11 is connected to the OUTPUT port OUTPUT, the cathode of the diode D7 is connected to the high-level VCC, the anode of the diode D8 is grounded, one end of the capacitor C10 is grounded, the other end of the capacitor C13 is connected, and the other end of the resistor R13 is connected to the OUTPUT port OUTPUT.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (3)
1. Looped netowrk cabinet operation detection device, including signal detection input circuit, signal operation processing circuit and output filter drive circuit, its characterized in that: in the signal detection input circuit, one end of one side of a primary coil of a transformer TQ1 is connected with an input port INPUTA, the other end of the primary coil of the transformer TQ 3578 is connected with an input port INPUTB, one end of one side of a secondary coil of the transformer TQ1 is connected with the cathode of a transient diode D6, the other end of the secondary coil of the transformer TQ1 is connected with the anode of a transient diode D6, one end of a resistor R4 is connected with the cathode of a transient diode D6, the other end of the resistor R4 is respectively connected with one end of a capacitor C2 and the cathode of a Schottky diode D4, the interface 2 of the transient diode group U2, the interface 1 of the transient diode group U2 and one end of a resistor R6 are connected, the other end of a capacitor C2 is grounded, the anode of a Schottky diode D4 is grounded, the other end of a resistor R6 is connected with the interface 2 of an amplifier U1A, the interface 3 of the amplifier U1A is respectively connected with one end of the resistor R7 and the interface 3 of the transient diode group U2, and the other end of the resistor R7 is connected with the anode of a transient diode D6; in the signal detection input circuit, an interface 8 of an amplifier U1A is connected with a high-level VCC, an interface 4 is grounded, an interface 1 is respectively connected with one end of a resistor R8, one end of a resistor R3 and one end of a resistor R2, the other end of the resistor R2 is connected with an interface 2 of the amplifier U1A, the other end of the resistor R8 is connected with the anode of a diode D5, the resistor R8 is connected with an output node of the signal detection input circuit at a position of a diode D5, the other end of the resistor R3 is respectively connected with an interface 3 of a diode group D2 and one end of a capacitor C3, the other end of the capacitor C3 is grounded, an interface 2 of the diode group D2 is respectively connected with the anode of the diode D1, the cathode of the light emitting diode D3 and one end of the capacitor C4, the other end of the capacitor C4 is respectively connected with an interface 1 of a diode group D2 and the ground, one end of a resistor R1 is respectively connected with the high-level VCC and the cathode of the diode D1, the other end is connected with the anode of a light-emitting diode D3.
2. The ring main unit operation detection device according to claim 1, wherein: the signal detection input circuit outputs a signal to the signal operation processing circuit through one end connected with a diode D5 through a resistor R8, the transmitted signal firstly passes through an amplification module taking an amplifier U1B as a core, the cathode of the diode D5 in the signal operation processing circuit is connected with a No. 5 interface of the amplifier U1B, one end of a resistor R5 is connected with the anode of a diode D5, the other end of the resistor R5 is connected with the anode of a capacitor C1, the cathode of the capacitor C1 is grounded, a No. 6 interface of the amplifier U1B is respectively connected with the anode of a capacitor C5, one end of a resistor R9 and one end of a capacitor C6, the cathode of the capacitor C5 is grounded, the other end of the resistor R9 is grounded, and the other end of the capacitor C6 is grounded; in the signal operation processing circuit, a No. 7 interface of an amplifier U1B is respectively connected with a cathode of a transient diode D6 and an anode of a diode D9, a drain terminal of the transistor Q4 is respectively connected with one end of a bidirectional diode D11, one end of a resistor R15, a collector of a cascade triode Q1 and one end of a resistor R10, the other end of the bidirectional diode D11 is connected with a source terminal of a transistor Q4, the other end of the resistor R10 is connected with a high-level VCC, the other end of a resistor R15 is connected with one end of a capacitor C9, the other end of the capacitor C9 is respectively connected with one end of a variable resistor R19, one end of a capacitor C13 and a base of the cascade triode Q1, the other end of the variable resistor R19 is connected with a cathode of a diode D9, the other end of a capacitor C13 is connected with a cathode of a diode D9, one end of a resistor R16 is connected with a cathode of a diode D9, the other end of the diode D18, a cathode of a Schottky diode D12 and a gate of the transistor Q4, the other end of the resistor R18 is connected with the drain terminal of the transistor Q4, the anode of the Schottky diode D12 is connected with the drain terminal of the transistor Q4, and the emitter of the double-cascade triode Q1 outputs signals after operation processing and is respectively connected with the anodes of the diode D10 and the diode D14 of the output filter driving circuit.
3. The ring main unit operation detection device according to claim 2, wherein: one end of a resistor R14 in the output filtering driving circuit is connected with the anode of a diode D10, the other end of the resistor R14 is connected with one end of a capacitor C8 and the base of a PNP triode Q3 respectively, the other end of the capacitor C8 is connected with one end of a capacitor C11, the other end of the capacitor C11 is connected with one end of a resistor R20 and the base of a triode Q6 respectively, the other end of a capacitor R20 is connected with the cathode of the diode D14, one end of a resistor R17 is connected with a high-level VCC, the other end of the resistor R17 is connected with one end of an inductor L2 and the collector of the triode Q6 respectively, the other end of the inductor L2 is connected with one end of a capacitor C7 and the gate of a transistor Q5 respectively, the other end of the capacitor C7 is connected with the gate of a transistor Q2, and the signal operation processing circuit is connected to the output filtering driving circuit through a diode D10 series resistor R14 and a diode D14 series resistor R20; one end of a resistor R12 in the OUTPUT filter driving circuit is connected with a high-level VCC, the other end of the resistor R12 is respectively connected with an emitter of a PNP triode Q3 and one end of an inductor L1, the other end of the inductor L1 is connected with a grid of a transistor Q2, one end of a resistor R21 is grounded, the other end of the resistor R is respectively connected with a collector of a PNP triode Q3, a source end of an emitter transistor Q5 of a triode Q6 and one end of a capacitor C12, the other end of the capacitor C12 is grounded, one end of a bidirectional diode D13 is grounded, the other end of the bidirectional diode D13 is respectively connected with a source end of the transistor Q2 and a drain end of a transistor Q5, a cathode of a diode D8 is respectively connected with an anode of a diode D7, a drain of a transistor Q5 and one end of the resistor R11, the other end of a resistor R11 is connected with an OUTPUT port PUOUTT, a cathode of a diode D7 is connected with a high-level VCC, an anode of a diode D8 is grounded, one end of the capacitor C10 is grounded, and the other end of the resistor R13 is connected with one end of the same, the other end of the resistor R13 is connected to the OUTPUT port OUTPUT.
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| WO2015184832A1 (en) * | 2014-10-09 | 2015-12-10 | 中兴通讯股份有限公司 | Alternating current detection circuit |
| WO2020238177A1 (en) * | 2019-05-24 | 2020-12-03 | 成都觅瑞科技有限公司 | Dual-control switch |
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| CN101388525B (en) * | 2007-11-23 | 2011-09-28 | 山东惠工电气股份有限公司 | Apparatus for detecting contact corona and arc-drawing of high voltage switch cabinet |
| WO2013102284A1 (en) * | 2012-01-04 | 2013-07-11 | 苏州朗格电气有限公司 | Nitrogen ring-network cabinet |
| CN203025518U (en) * | 2012-12-27 | 2013-06-26 | 河南省博翰自动化设备销售有限公司 | Intelligent safe operation detector for high-voltage switch cabinet |
| CN203688769U (en) * | 2014-02-18 | 2014-07-02 | 国家电网公司 | 10KV switch cabinet residue frequency detection apparatus based on antenna array |
| DE102014110481A1 (en) * | 2014-07-24 | 2016-01-28 | Hamburg Innovation Gmbh | Protective device for electrical energy supply networks, energy source, power supply network and use of such a protective device |
| CN204669245U (en) * | 2015-05-06 | 2015-09-23 | 国家电网公司 | A kind of power supply tri-level inversion element circuit |
| CN206164091U (en) * | 2016-10-26 | 2017-05-10 | 国网青海省电力公司海北供电公司 | Arc light explosion -proof system that response speed is fast, reliability is high |
| CN206323364U (en) * | 2017-01-03 | 2017-07-11 | 大唐贵州发耳发电有限公司 | A kind of subsidiary engine stoppage in transit signal output apparatus |
| CN207051393U (en) * | 2017-07-03 | 2018-02-27 | 特恩普电力科技（杭州）有限公司 | The capacitance measurement circuit of high-tension switch cabinet capacitance sensor |
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| WO2015184832A1 (en) * | 2014-10-09 | 2015-12-10 | 中兴通讯股份有限公司 | Alternating current detection circuit |
| WO2020238177A1 (en) * | 2019-05-24 | 2020-12-03 | 成都觅瑞科技有限公司 | Dual-control switch |
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