CN218567485U - Lightning arrester on-line monitoring system - Google Patents
Lightning arrester on-line monitoring system Download PDFInfo
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- CN218567485U CN218567485U CN202222365288.5U CN202222365288U CN218567485U CN 218567485 U CN218567485 U CN 218567485U CN 202222365288 U CN202222365288 U CN 202222365288U CN 218567485 U CN218567485 U CN 218567485U
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Abstract
The utility model relates to an arrester monitoring technology field, the utility model provides an arrester on-line monitoring system, including the number of times monitoring circuit that discharges, the number of times monitoring circuit that discharges includes current transformer U1, rectifier bridge D2, rheostat RP1, resistance R1, opto-coupler U2, diode D4 and resistance R2, rectifier bridge D2's first input is connected to current transformer U1's first output, rectifier bridge D2's second input is connected to current transformer U1's second output, rheostat RP 1's first end is connected to rectifier bridge D2's first output, rheostat RP 1's second end is connected to rectifier bridge D2's second output. Through above-mentioned technical scheme, the problem that arrester monitoring system circuit structure is complicated, the reliability is poor among the prior art has been solved.
Description
Technical Field
The utility model relates to an arrester monitoring technology field, it is specific, relate to arrester on-line monitoring system.
Background
Arresters are used to protect electrical equipment from high transient overvoltages and to limit the follow current time, and also to limit the follow current amplitude, and are usually connected between the grid conductor and the earth, sometimes also beside the electrical winding or between the conductors. The quality of the performance of the lightning arrester has great influence on the safe operation of electrical equipment, the operation state of the lightning arrester is monitored on line, the operation state of the lightning arrester can be known at any time under the condition of no power outage, and possible abnormal conditions and accident potential can be found in time. And preventive measures are taken to prevent economic loss caused by expansion of accidents and ensure that the device runs under a good condition.
The discharge frequency and the leakage current are two important indexes of lightning arrester monitoring, and when the lightning arrester monitoring system in the prior art monitors the two indexes, the designed circuit structure is complex and the reliability is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides an arrester on-line monitoring system has solved the problem that arrester monitoring system circuit structure is complicated among the prior art, the reliability is poor.
The technical scheme of the utility model as follows:
an arrester on-line monitoring system comprises a discharge frequency monitoring circuit, wherein the discharge frequency monitoring circuit comprises a current transformer U1, a rectifier bridge D2, a rheostat RP1, a resistor R1, an optocoupler U2, a diode D4 and a resistor R2, a first output end of the current transformer U1 is connected with a first input end of the rectifier bridge D2, a second output end of the current transformer U1 is connected with a second input end of the rectifier bridge D2, a first output end of the rectifier bridge D2 is connected with a first end of the rheostat RP1, a second output end of the rectifier bridge D2 is connected with a second end of the rheostat RP1, a second end of the rheostat RP1 is connected with a first end of the resistor R1, a second end of the resistor R1 is connected with an anode of a diode of the optocoupler U2, a cathode of the diode U2 is connected with a second end of the rheostat RP1, a collector of a triode of the optocoupler U2 is connected with a cathode of the diode D4, an emitter of the triode of the diode U2 is grounded, an anode of the diode D4 is connected with an interrupt interface of a singlechip, a cathode of the resistor VCC R2 is connected with a second end of the resistor R2, and a second end of the resistor R2 is connected with a power supply.
As a further technical solution, the power supply further includes a bidirectional zener diode D1 and a zener diode D3, the first end of the current transformer U1 is connected to the first end of the bidirectional zener diode D1, the second end of the current transformer U1 is connected to the second end of the bidirectional zener diode D1, the sliding end of the varistor RP1 is connected to the cathode of the zener diode D3, and the anode of the zener diode D3 is connected to the second end of the varistor RP 1.
As a further technical scheme, the lightning arrester further comprises a voltage monitoring circuit, the voltage monitoring circuit comprises a current transformer U3, an operational amplifier U4, a resistor R3 and a rheostat RP2, a first output end of a secondary side of the lightning arrester voltage transformer is connected with a first input end of the current transformer U3 through a resistor R19, a second output end of the secondary side of the lightning arrester voltage transformer is connected with a second input end of the current transformer U3, a first output end of the current transformer U3 is connected with an inverting input end of the operational amplifier U4, a second output end of the current transformer U3 is connected with a non-inverting input end of the operational amplifier U4, an output end of the operational amplifier U4 is connected with a single chip microcomputer, an inverting input end of the operational amplifier U4 is connected with a first end of the resistor R3, a second end of the resistor R3 is connected with a first end of the rheostat RP2, and a second end of the rheostat RP2 is connected with an output end of the operational amplifier U4.
As a further technical scheme, the lightning arrester further comprises a current monitoring circuit, wherein the current monitoring circuit comprises an operational amplifier U5, a resistor R5, an operational amplifier U6 and a rheostat RP3, a first output end of a lightning arrester current transformer is connected with an inverting input end of the operational amplifier U5, a second output end of the lightning arrester current transformer is connected with an non-inverting input end of the operational amplifier U5, an output end of the operational amplifier U5 is connected with a first end of the resistor R5, a second end of the resistor R5 is connected with an inverting input end of the operational amplifier U6, the non-inverting input end of the operational amplifier U6 is grounded through a resistor R7, an output end of the operational amplifier U6 is connected with a single chip microcomputer, the inverting input end of the operational amplifier U5 is connected with a first end of the rheostat RP3, and a second end of the rheostat RP3 is connected with an output end of the operational amplifier U5.
As a further technical scheme, the power supply further comprises a voltage stabilizing diode D9, wherein the output end of the operational amplifier U6 is connected with the cathode of the voltage stabilizing diode D9, and the cathode of the voltage stabilizing diode D9 is grounded.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses in monitor the electric current that flows through the zinc oxide resistance card on the arrester through current transformer U1, current transformer U1 transmits the signal of telecommunication to rectifier bridge D2, after rectifier bridge D2 rectification was accomplished, the output electric signal transmission was to on rheostat RP1, then the signal of telecommunication again transmits to opto-coupler U2 through resistance R1, the diode in opto-coupler U2 switches on, the triode in opto-coupler U2 also switches on, has realized the isolation transmission of signal; before the triode in the opto-coupler switches on, the negative pole of diode D4 is in the high level, diode D4 is in the breakdown conducting state, diode D4's positive pole output high level promptly, the interrupt pin of singlechip inputs the high level, after the triode in the opto-coupler U2 switches on, make diode D4's negative pole be in the low level state, the singlechip interrupts the pin and obtains a level jump signal, the number of discharges adds one, the real-time supervision record of the number of discharges of the arrester has been realized, provide reliable foundation for the routine maintenance arrester.
The utility model discloses a real-time supervision of arrester number of times that discharges, circuit structure is simple moreover, the reliability is high.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a circuit for monitoring the number of discharge cycles of the present invention;
FIG. 2 is a schematic diagram of a medium voltage monitoring circuit according to the present invention;
fig. 3 is a schematic diagram of the medium current monitoring circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
As shown in fig. 1 to fig. 3, this embodiment provides an online lightning arrester monitoring system, which includes a discharge frequency monitoring circuit, where the discharge frequency monitoring circuit includes a current transformer U1, a rectifier bridge D2, a varistor RP1, a resistor R1, an optocoupler U2, a diode D4, and a resistor R2, a first output end of the current transformer U1 is connected to a first input end of the rectifier bridge D2, a second output end of the current transformer U1 is connected to a second input end of the rectifier bridge D2, a first output end of the rectifier bridge D2 is connected to a first end of the varistor RP1, a second output end of the rectifier bridge D2 is connected to a second end of the varistor RP1, a sliding end of the varistor RP1 is connected to a first end of the resistor R1, a second end of the resistor R1 is connected to an anode of the optocoupler U2 diode, a cathode of the optocoupler U2 diode is connected to a second end of the varistor RP1, a collector of the optocoupler U2 is connected to a cathode of the diode D4, an emitter of the diode D2 is grounded, an anode of the diode D4 is connected to a VCC, and a cathode of the resistor R2 is connected to a cathode of the resistor R2, and a cathode of the resistor R2 is connected to a power supply interface.
In the embodiment, the current flowing through the zinc oxide resistor disc on the lightning arrester is monitored through the current transformer U1, then the current transformer U1 transmits an electric signal to the rectifier bridge D2, after the rectifier bridge D2 finishes rectification, the electric signal is output and transmitted to the rheostat RP1, then the electric signal is transmitted to the optocoupler U2 through the resistor R1 to reach the conducting voltage of the diode in the optocoupler U2, the diode in the optocoupler U2 is conducted, and further the triode in the optocoupler U2 is also conducted, so that the isolated transmission of the signal is realized;
before a triode in the optocoupler U2 is conducted, the cathode of the diode D4 is at a high level, the diode D4 is in a breakdown conduction state, namely the anode of the diode D4 outputs the high level, and the singlechip receives the high level; after a triode in the optocoupler U2 is conducted, the cathode of the diode D4 is in a low level state, the single chip microcomputer obtains a level jump signal, the number of discharging times is increased by one, real-time monitoring and recording of the number of discharging times of the lightning arrester are achieved, and manual maintenance is facilitated.
The high-voltage power supply further comprises a bidirectional voltage stabilizing diode D1 and a voltage stabilizing diode D3, the first end of the current transformer U1 is connected with the first end of the bidirectional voltage stabilizing diode D1, the second end of the current transformer U1 is connected with the second end of the bidirectional voltage stabilizing diode D1, the sliding end of the rheostat RP1 is connected with the cathode of the voltage stabilizing diode D3, and the anode of the voltage stabilizing diode D3 is connected with the second end of the rheostat RP 1.
In the embodiment, the bidirectional voltage stabilizing diode D1 is added at two output ends of the current transformer U1 and is used for absorbing a voltage peak output by the current transformer U1, so that the damage to subsequent circuit elements is avoided; in addition, the voltage output by the rheostat RP1 is also limited by the voltage stabilizing diode D3, and the optocoupler U2 is prevented from being damaged by overlarge voltage.
Further, the lightning arrester further comprises a voltage monitoring circuit, as shown in fig. 2, the voltage monitoring circuit comprises a current transformer U3, an operational amplifier U4, a resistor R3 and a rheostat RP2, a first output end of a secondary side of the lightning arrester voltage transformer is connected with a first input end of the current transformer U3 through a resistor R19, a second output end of a secondary side of the lightning arrester voltage transformer is connected with a second input end of the current transformer U3, a first output end of the current transformer U3 is connected with an inverting input end of the operational amplifier U4, a second output end of the current transformer U3 is connected with a non-inverting input end of the operational amplifier U4, an output end of the operational amplifier U4 is connected with the single chip microcomputer, an inverting input end of the operational amplifier U4 is connected with a first end of the resistor R3, a second end of the resistor R3 is connected with a first end of the rheostat RP2, and a second end of the rheostat RP2 is connected with an output end of the operational amplifier U4.
In this embodiment, the output voltage of the secondary side of the arrester voltage transformer is 100V, a large voltage signal is converted into a small current signal by connecting a resistor R19 in series with the secondary side of the arrester voltage transformer, and then the small current signal is sampled by the current transformer U3, in order to reduce phase shift and increase the dynamic range of the transformer, current signals at two ends of the current transformer U3 are respectively input to the non-inverting input end and the inverting input end of the operational amplifier U4, the operational amplifier U4 and the surrounding element resistor R3 and the rheostat RP2 form a current-voltage conversion circuit, the obtained current signal is converted into a voltage signal again and input to the single chip microcomputer from the output end of the operational amplifier U4, and the single chip microcomputer judges whether the arrester is abnormal in overvoltage according to the voltage signal.
Further, the lightning protection circuit further comprises a current monitoring circuit, as shown in fig. 3, the current monitoring circuit comprises an operational amplifier U5, a resistor R5, an operational amplifier U6 and a rheostat RP3, a first output end of an arrester current transformer is connected with an inverting input end of the operational amplifier U5, a second output end of the arrester current transformer is connected with an non-inverting input end of the operational amplifier U5, an output end of the operational amplifier U5 is connected with a first end of the resistor R5, a second end of the resistor R5 is connected with an inverting input end of the operational amplifier U6, the non-inverting input end of the operational amplifier U6 is grounded through a resistor R7, an output end of the operational amplifier U6 is connected with the single chip microcomputer, the inverting input end of the operational amplifier U5 is connected with a first end of the rheostat RP3, and a second end of the rheostat RP3 is connected with an output end of the operational amplifier U5.
In this embodiment, the lightning arrester current transformer is a current transformer on a ground wire at the tail end of the lightning arrester, in order to meet the requirement of a single chip microcomputer for voltage, a current signal at the secondary side of the lightning arrester current transformer is input to an operational amplifier U5, the operational amplifier U5 and a rheostat RP3 around the operational amplifier U5 form a current-voltage conversion circuit, the obtained current signal is converted into a voltage signal, then an output end of the operational amplifier U5 transmits the electric signal to an inverted input end of an operational amplifier U6, the operational amplifier U6 further forms an amplification filter circuit, the electric signal is further amplified and filtered, finally the operational amplifier U6 outputs the signal to the single chip microcomputer, the signal is compared with a current which flows through a zinc oxide resistor on the lightning arrester and is monitored by the current transformer U1, and the difference between the current and the dirt current is used for analyzing leakage current and dirt current.
Further, as shown in fig. 3, the output terminal of the operational amplifier U6 is connected to the cathode of the zener diode D9, and the cathode of the zener diode D9 is grounded.
In this embodiment, the zener diode D9 has avoided the too high condition of voltage of fortune to put U6 output, has guaranteed that the chip and other devices in the singlechip can not be damaged to the signal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the present invention.
Claims (5)
1. The lightning arrester on-line monitoring system is characterized by comprising a discharge frequency monitoring circuit, wherein the discharge frequency monitoring circuit comprises a current transformer U1, a rectifier bridge D2, a rheostat RP1, a resistor R1, an optocoupler U2, a diode D4 and a resistor R2, a first output end of the current transformer U1 is connected with a first input end of the rectifier bridge D2, a second output end of the current transformer U1 is connected with a second input end of the rectifier bridge D2, a first output end of the rectifier bridge D2 is connected with a first end of the rheostat RP1, a second output end of the rectifier bridge D2 is connected with a second end of the rheostat RP1, a sliding end of the rheostat RP1 is connected with a first end of the resistor R1, a second end of the resistor R1 is connected with an anode of the optocoupler U2 diode, a cathode of the optocoupler U2 diode is connected with a second end of the rheostat RP1, a collector of the optocoupler U2 triode is connected with a cathode of the diode D4, an emitter of the U2 triode is grounded, an anode of the diode D4 is connected with an interrupt interface, a cathode of the resistor D4 is connected with a VCC power supply, and a cathode of the resistor R2 is connected with a second end of the resistor R2.
2. The online lightning arrester monitoring system according to claim 1, further comprising a bi-directional zener diode D1 and a zener diode D3, wherein the first terminal of the current transformer U1 is connected to the first terminal of the bi-directional zener diode D1, the second terminal of the current transformer U1 is connected to the second terminal of the bi-directional zener diode D1, the sliding terminal of the varistor RP1 is connected to the cathode of the zener diode D3, and the anode of the zener diode D3 is connected to the second terminal of the varistor RP 1.
3. The online lightning arrester monitoring system according to claim 2, further comprising a voltage monitoring circuit, wherein the voltage monitoring circuit comprises a current transformer U3, an operational amplifier U4, a resistor R3 and a rheostat RP2, a first output terminal of a secondary side of the lightning arrester voltage transformer is connected to a first input terminal of the current transformer U3 through a resistor R19, a second output terminal of the secondary side of the lightning arrester voltage transformer is connected to a second input terminal of the current transformer U3, a first output terminal of the current transformer U3 is connected to an inverting input terminal of the operational amplifier U4, a second output terminal of the current transformer U3 is connected to a non-inverting input terminal of the operational amplifier U4, an output terminal of the operational amplifier U4 is connected to the single chip microcomputer, an inverting input terminal of the operational amplifier U4 is connected to a first terminal of the resistor R3, a second terminal of the resistor R3 is connected to a first terminal of the RP rheostat 2, and a second terminal of the rheostat RP2 is connected to an output terminal of the operational amplifier U4.
4. The online monitoring system for the lightning arrester according to claim 3, further comprising a current monitoring circuit, wherein the current monitoring circuit comprises an operational amplifier U5, a resistor R5, an operational amplifier U6 and a rheostat RP3, a first output end of the lightning arrester current transformer is connected with an inverting input end of the operational amplifier U5, a second output end of the lightning arrester current transformer is connected with a non-inverting input end of the operational amplifier U5, an output end of the operational amplifier U5 is connected with a first end of the resistor R5, a second end of the resistor R5 is connected with an inverting input end of the operational amplifier U6, a non-inverting input end of the operational amplifier U6 is grounded through a resistor R7, an output end of the operational amplifier U6 is connected with the single chip microcomputer, an inverting input end of the operational amplifier U5 is connected with a first end of the rheostat RP3, and a second end of the rheostat RP3 is connected with an output end of the operational amplifier U5.
5. The online lightning arrester monitoring system according to claim 4, further comprising a zener diode D9, wherein the output terminal of the operational amplifier U6 is connected to the cathode of the zener diode D9, and the cathode of the zener diode D9 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222365288.5U CN218567485U (en) | 2022-09-06 | 2022-09-06 | Lightning arrester on-line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222365288.5U CN218567485U (en) | 2022-09-06 | 2022-09-06 | Lightning arrester on-line monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218567485U true CN218567485U (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222365288.5U Active CN218567485U (en) | 2022-09-06 | 2022-09-06 | Lightning arrester on-line monitoring system |
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| Country | Link |
|---|---|
| CN (1) | CN218567485U (en) |
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- 2022-09-06 CN CN202222365288.5U patent/CN218567485U/en active Active
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