CN210604856U - Oscillation wave partial discharge detection device without detection blind zone - Google Patents
Oscillation wave partial discharge detection device without detection blind zone Download PDFInfo
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- CN210604856U CN210604856U CN201921043145.4U CN201921043145U CN210604856U CN 210604856 U CN210604856 U CN 210604856U CN 201921043145 U CN201921043145 U CN 201921043145U CN 210604856 U CN210604856 U CN 210604856U
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Abstract
The utility model discloses a no detection blind area oscillatory wave partial discharge detection device. The utility model discloses a high voltage direct current power, current-limiting resistor, high-voltage relay, mechanical switch, reactor, condenser, voltmeter, ampere meter, detection impedance and partial discharge detector. The high-voltage direct-current power supply, the current-limiting resistor, the reactor, the ammeter, the capacitor and the detection impedance are connected in series to form a loop, a negative electrode of the high-voltage direct-current power supply and the partial discharge detector are connected with a signal output end of the detection impedance, and a grounding end of the detection impedance is grounded. The voltmeter is connected in parallel on the high-voltage relay, one end of the high-voltage relay after being connected in parallel with the mechanical switch is connected to the high-voltage side of the series loop, and the other end of the high-voltage relay is grounded. The utility model discloses a mode switch-on reactor ground return circuit of high voltage relay and mechanical switch combination effectively solves the problem that causes interference signal because of high voltage relay switches on with the diode, can avoid mechanical switch to produce the risk of electric arc because voltage overshoots simultaneously.
Description
Technical Field
The utility model belongs to the technical field of power equipment measures, concretely relates to there is not detection blind area oscillatory wave partial discharge detection device.
Background
The excellent insulation performance is the basic condition for normal operation of high-voltage equipment and even a power grid system, and insulation degradation or insulation capacity failure is one of the main reasons for faults of the high-voltage electrical equipment and the power grid system. The most sensitive and effective means have been known in the industry to detect the partial discharge characteristics and reflect the dielectric state of the medium.
When a partial discharge test is carried out, high pre-excitation voltage and test voltage must be applied to a tested product, and for the tested products with large capacitance such as a power cable, a power capacitor and the like, the application of the test voltage requires large power supply power. The mode adopts the AC power supply to continuously pressurize, has higher requirement on a test power supply, and has the defects of large test capacity, complex required test equipment, large power load power, huge and expensive power supply equipment and the like.
The voltage application for performing the partial discharge test by the direct current voltage can be realized by using a damped oscillation mechanism composed of a capacitor, a reactor and a resistor. In the method, a certain direct current high voltage is stored in a capacitor of a test loop in advance, and then a high-voltage relay is used for quickly grounding from one end of an inductor to form high-voltage damping oscillation so as to obtain a transient alternating current high voltage, and partial discharge is excited in a tested product for detection.
As shown in fig. 1, the test procedure was performed by first charging the capacitor C to the test voltage and then closing the high voltage relay, the capacitor C and the reactor L forming a series oscillating circuit. In the circuit, if the tested object is a cable equal-capacitance device, the tested object is matched with a corresponding high-voltage reactor to resonate; and if the tested object is a reactor, the corresponding high-voltage capacitor is matched for resonance.
The application of test voltage is carried out by the direct current high voltage mode, continuous power supply to a detection loop is not needed, and the power supply power and the equipment scale of the test are reduced at the same time.
At present, the method for processing the interference signal at home and abroad is to window a partial discharge map, namely, interference time domain detection data formed by conducting a high-voltage relay and a diode is integrally eliminated on the partial discharge detection map by a software means, and if the time domain is overlapped with the partial discharge signal, the interference time domain detection data are also eliminated together, so that a certain detection blind area is formed, and two sections of the blind area exist in each period.
Disclosure of Invention
The utility model aims at providing a no detection blind area oscillatory wave partial discharge detection device to the not enough of prior art.
In order to overcome the detection blind area, a high-voltage relay and a mechanical switch are combined to be connected with a reactor grounding loop, namely, a contact of the mechanical switch is connected in the shortest time after the high-voltage relay is connected. After the method is adopted, the interference caused by the conduction threshold voltage of the high-voltage relay does not exist, and the corresponding detection blind area does not exist.
A detection circuit adopted by the device comprises a high-voltage direct-current power supply, a current-limiting resistor, a high-voltage relay, a mechanical switch, a reactor (or a reactor of a tested object) without partial discharge, a capacitor (or a coupling capacitor) of the tested object, a voltmeter, an ammeter, a detection impedance and a partial discharge detector.
In the circuit, if the tested object is a cable equal-capacitance device, the tested object is matched with a corresponding partial discharge-free reactor to carry out resonance; and if the tested object is a reactor, matching a corresponding non-partial discharge coupling capacitor for resonance.
Taking the tested object as an example of a capacitor, the following explanation is made:
the high-voltage direct-current power supply, the current-limiting resistor, the reactor, the ammeter, the capacitor and the detection impedance are connected in series to form a loop, a negative electrode of the high-voltage direct-current power supply and the partial discharge detector are connected with a signal output end of the detection impedance, and a grounding end of the detection impedance is grounded. The voltmeter is connected in parallel on the high-voltage relay, one end of the high-voltage relay after being connected in parallel with the mechanical switch is connected to the high-voltage side of the series loop, and the other end of the high-voltage relay is grounded.
Furthermore, the output voltage of the high-voltage direct-current power supply is 300-60 KV, and the output voltage and the frequency are matched with the voltage grade of the capacitor to be measured.
Furthermore, the specifications of the high-voltage relay are matched with the voltage of the high-voltage direct-current power supply.
Further, the mechanical switch is controlled by electromagnetic operation, and specifically comprises the following components:
the mechanical switch structure comprises a fixed end, a first coil, an insulating cylinder, a second coil, an armature core adsorption groove, a telescopic armature core, an armature core splicing cap and a movable end; the telescopic armature core is arranged at the movable end through an armature core splicing cap, and the armature core adsorption groove is arranged at the fixed end; the first coil and the second coil are respectively arranged on the outer side wall of the insulating cylinder body and are isolated by an insulating bulge on the outer side wall of the insulating cylinder body; when the first coil is connected with an external direct current power supply, the first coil generates a magnetic field, so that the telescopic armature core is extended and then is contacted with the armature core adsorption groove, and the mechanical switch is switched on; when the first coil is disconnected with an external direct-current power supply and the second coil is connected with the external direct-current power supply, the magnetic field generated by the first coil is dissipated, and the second coil generates a magnetic field, so that the telescopic armature core retracts under the action of the magnetic field, namely the telescopic armature core is disconnected with the armature core adsorption groove, and the mechanical switch is disconnected;
furthermore, the voltage grade of the reactor is matched with that of the capacitor to be detected.
Further, the detection impedance meets the capacitance of the coupling capacitor in the oscillation loop and is within the tuning capacitance range of the detection impedance.
Furthermore, the partial discharge detector has the functions of signal acquisition, digital signal processing and image display analysis.
The method adopts a direct-current high-voltage power supply to charge a capacitor of a tested object, and utilizes a high-voltage relay and mechanical switch combined mode to switch on a reactor and ground a loop, so that interference signals can be effectively avoided.
By utilizing the characteristic that no voltage overshoot exists when the high-voltage relay is switched on, the risk that the mechanical switch generates electric arc due to the voltage overshoot can be avoided by switching on the high-voltage relay firstly; after the high-voltage relay is switched on, the mechanical switch contact is switched on and the high-voltage relay is switched off in as short a time as possible, so that certain voltage and current pulses can be prevented from being formed by the high-voltage relay under the condition of bearing high voltage, and interference on partial discharge detection can be avoided. And the local discharge detection is carried out by utilizing an oscillation loop formed by connecting the capacitor to be tested and the reactor without the local discharge in series, and finally the local discharge condition of the capacitor to be tested is judged according to a map transmitted back to the local discharge detector by the detection impedance.
The specific method comprises the following steps:
firstly, the high-voltage relay is disconnected, a capacitor of a tested object is connected to a detection circuit, and the capacitor of the tested object is charged to a preset voltage through a direct-current high-voltage power supply;
when the value of the ammeter reaches 0, the capacitor of the tested product is fully charged, at the moment, the high-voltage relay is closed, and the capacitor of the tested product and the reactor form a series oscillation circuit;
when the voltmeter shows that the voltage is reduced to a certain critical value, the mechanical switch contact is switched on and the high-voltage relay is switched off within the shortest time;
and finally, judging the partial discharge condition of the capacitor to be detected according to the map transmitted to the partial discharge detector by the detection impedance:
if the voltage curve is an oscillating wave curve and no pulse signal is displayed at the peak value of the corresponding voltage curve, judging that the capacitor of the tested object has no partial discharge;
if the voltage curve is an oscillation wave curve and the pulse signal is displayed at the peak-to-peak value of the corresponding voltage curve, the capacitor of the tested object is judged to have partial discharge.
The utility model discloses a benefit:
the method is simple and easy to operate, the reactor grounding loop is connected in a mode of combining the high-voltage relay and the mechanical switch, and the problem of interference signals caused by the conduction of the high-voltage relay and the diode can be effectively solved, so that a detection blind area does not exist, and the risk of electric arcs generated by voltage overshoot of the mechanical switch can be avoided.
Drawings
FIG. 1 is a schematic diagram of a capacitive (or inductive) tester for detecting partial discharge by oscillating waves;
FIG. 2 is a schematic diagram of a circuit test in the method of the present invention;
FIG. 3 is a graph of no partial discharge;
FIG. 4 is a graph of the presence of partial discharge;
fig. 5 is a structural diagram of the mechanical switch of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings, in which the described embodiments are only intended to facilitate an understanding of the invention, but are not intended to limit it in any way.
A detection circuit adopted by the method is shown in figure 2: the high-voltage direct-current power supply comprises a high-voltage direct-current power supply 1, a current-limiting resistor 2, a high-voltage relay 3, a mechanical switch 4, a reactor 5, a capacitor 6, a voltmeter 7, an ammeter 8, a detection impedance 9 and a partial discharge detector 10.
In the circuit, if the tested object is the reactor 5, the corresponding non-partial discharge coupling capacitor 6 is matched for resonance; and if the tested object is the capacitor 6, matching the corresponding non-partial discharge reactor 5 for resonance.
Taking the tested object as an example of a capacitor, the following explanation is made:
the high-voltage direct current power supply 1, the current-limiting resistor 2, the reactor 5, the ammeter 8, the capacitor 6 and the detection impedance 9 are connected in series to form a loop, the negative electrode of the high-voltage direct current power supply 1 and the partial discharge detector 10 are connected with the signal output end of the detection impedance 9, and the grounding end of the detection impedance 9 is grounded. The voltmeter 7 is connected in parallel on the high-voltage relay 3, one end of the high-voltage relay 3 after being connected in parallel with the mechanical switch 4 is connected to the high-voltage side of the series circuit, and the other end is grounded.
The output voltage of the high-voltage direct-current power supply 1 is 300-60 KV, and the output voltage and the frequency are matched with the voltage grade of the capacitor to be measured. The specification of the high-voltage relay 3 is matched with the voltage of the high-voltage direct-current power supply 1. The reactor 5 is matched with the voltage grade of the capacitor 6 to be detected. The detection impedance 9 satisfies the capacitance of the coupling capacitor in the oscillating circuit and is within the tuning capacitance range of the detection impedance. The partial discharge detector 10 has signal acquisition, digital signal processing, and image display analysis functions.
The mechanical switch 4 is controlled by electromagnetic operation, and the specification is matched with the voltage of the high-voltage direct-current power supply 1. The specific structure is shown in fig. 5: the coil comprises a fixed end 4-1, a first coil 4-2, an insulating cylinder 4-3, a second coil 4-4, an armature core adsorption groove 4-5, a telescopic armature core 4-6, an armature core splicing cap 4-7 and a movable end 4-8; the telescopic armature core 4-6 is arranged at the movable end 4-8 through an armature core splicing cap 4-7, and the armature core adsorption groove 4-5 is arranged at the fixed end 4-1; the first coil 4-2 and the second coil 4-4 are respectively arranged on the outer side wall of the insulating cylinder 4-3, and the first coil 4-2 and the second coil 4-4 are isolated by an insulating bulge on the outer side wall of the insulating cylinder 4-3; when the first coil 4-2 is connected with an external direct-current power supply, the first coil 4-2 generates a magnetic field, so that the telescopic armature core 4-6 is contacted with the armature core adsorption groove 4-5 after being extended, and a mechanical switch is switched on; when the first coil 4-2 is disconnected with an external direct-current power supply and the second coil 4-4 is connected with the external direct-current power supply, the magnetic field generated by the first coil 4-2 is dissipated, the second coil 4-4 generates a magnetic field, so that the telescopic armature core 4-6 retracts under the action of the magnetic field, namely the telescopic armature core 4-6 is disconnected with the armature core adsorption groove 4-5, and the mechanical switch is disconnected;
when the partial discharge test is carried out, the capacitor is charged under the condition that the switch is disconnected, the high-voltage relay is switched on after the charging is finished, the mechanical switch is switched on and the high-voltage relay is switched off in the shortest time after the electronic switch is switched on, so that the reactor and the capacitor form a closed oscillating circuit without generating an interference signal, and whether the capacitor of the tested object has a partial discharge fault can be judged by detecting a map transmitted to the partial discharge detector through impedance, as shown in fig. 3 and 4.
The specific detection method comprises the following steps:
firstly, the high-voltage relay 3 is disconnected, the capacitor 6 of the tested object is connected to a detection circuit, and the capacitor 6 of the tested object is charged to a preset voltage through the direct-current high-voltage power supply 1;
when the value of the ammeter reaches 0, the capacitor 6 of the tested product is fully charged, at the moment, the high-voltage relay 3 is closed, and the capacitor 6 of the tested product and the reactor 5 form a series oscillation circuit;
when the voltmeter 7 shows that the voltage drops to the set threshold, the mechanical switch 4 is switched on and the high-voltage relay 3 is switched off in the shortest time; specifically, the method comprises the following steps:
when the voltage is reduced to a set threshold value, an external direct current power supply is directly connected to the first coil 2, the first coil 2 generates a magnetic field, and the telescopic armature core 1 is extended and then is contacted with the armature core adsorption end 5, so that the mechanical switch 4 is switched on;
and finally, judging the partial discharge condition of the capacitor 6 to be detected according to the map transmitted from the detection impedance 9 to the partial discharge detector 10:
as shown in fig. 3, if the voltage curve is an oscillating wave curve and no pulse signal is displayed at the peak-to-peak value of the corresponding voltage curve, it is determined that the capacitor of the tested object has no partial discharge;
as shown in fig. 4, if the voltage curve is an oscillating wave curve and the pulse signal is present at the peak-to-peak value of the corresponding voltage curve, it is determined that the partial discharge exists in the capacitor of the tested object.
Claims (4)
1. The oscillation wave partial discharge detection device without the detection blind area is characterized in that a detection circuit comprises a high-voltage direct-current power supply, a current-limiting resistor, a high-voltage relay, a mechanical switch, a reactor, a capacitor, a voltmeter, an ammeter, a detection impedance and a partial discharge detector;
the high-voltage direct-current power supply, the current-limiting resistor, the reactor, the ammeter, the capacitor and the detection impedance are connected in series to form a loop, a negative electrode of the high-voltage direct-current power supply and the partial discharge detector are connected with a signal output end of the detection impedance, and a grounding end of the detection impedance is grounded; the voltmeter is connected in parallel on the high-voltage relay, one end of the high-voltage relay after being connected in parallel with the mechanical switch is connected to the high-voltage side of the series loop, and the other end of the high-voltage relay is grounded.
2. The oscillation wave partial discharge detection device without the detection blind area according to claim 1, wherein the mechanical switch is a mechanical switch controlled by an electromagnetic actuator, and the specification of the mechanical switch is matched with the voltage of the high voltage direct current power supply.
3. The oscillation wave partial discharge detection device without the detection blind area according to claim 1 or 2, characterized in that the mechanical switch structure comprises a fixed end, a first coil, an insulating cylinder, a second coil, an armature core adsorption groove, a telescopic armature core, an armature core splicing cap and a movable end; the telescopic armature core is arranged at the movable end through an armature core splicing cap, and the armature core adsorption groove is arranged at the fixed end; the first coil and the second coil are respectively arranged on the outer side wall of the insulating cylinder body and are isolated by an insulating bulge on the outer side wall of the insulating cylinder body; when the first coil is connected with an external direct current power supply, the first coil generates a magnetic field, so that the telescopic armature core is extended and then is contacted with the armature core adsorption groove, and the mechanical switch is switched on; when the first coil is disconnected with the external direct-current power supply and the second coil is connected with the external direct-current power supply, the magnetic field generated by the first coil dissipates and the second coil generates a magnetic field, so that the telescopic armature core retracts under the action of the magnetic field, namely, the telescopic armature core is disconnected with the armature core adsorption groove, and the mechanical switch is disconnected.
4. The oscillation wave partial discharge detection device without the detection blind area according to claim 3, wherein the output voltage of the high-voltage direct-current power supply is 300V-60 KV, and the output voltage and the frequency are matched with the voltage grade of the capacitor to be detected; the specifications of the high-voltage relay are matched with the voltage of the high-voltage direct-current power supply; the voltage grade of the reactor is matched with that of the capacitor to be detected; the detection impedance meets the capacitance of a coupling capacitor in the oscillation circuit and is within the range of the tuning capacitance of the detection impedance; the partial discharge detector has the functions of signal acquisition, digital signal processing and image display analysis.
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| CN201921043145.4U CN210604856U (en) | 2019-07-05 | 2019-07-05 | Oscillation wave partial discharge detection device without detection blind zone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196382A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | A kind of no check frequency oscillation wave partial discharge detection device |
| CN112782545A (en) * | 2021-03-18 | 2021-05-11 | 西安热工研究院有限公司 | Method for testing partial discharge of generator |
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2019
- 2019-07-05 CN CN201921043145.4U patent/CN210604856U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196382A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | A kind of no check frequency oscillation wave partial discharge detection device |
| CN110196382B (en) * | 2019-07-05 | 2023-12-22 | 杭州西湖电子研究所 | No detection blind area oscillatory wave partial discharge detection device |
| CN112782545A (en) * | 2021-03-18 | 2021-05-11 | 西安热工研究院有限公司 | Method for testing partial discharge of generator |
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