CN210626597U - Detection apparatus for utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge - Google Patents
Detection apparatus for utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge Download PDFInfo
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- CN210626597U CN210626597U CN201921043777.0U CN201921043777U CN210626597U CN 210626597 U CN210626597 U CN 210626597U CN 201921043777 U CN201921043777 U CN 201921043777U CN 210626597 U CN210626597 U CN 210626597U
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Abstract
The utility model discloses an utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge's detection device. The utility model discloses use power transformer's capacitive sleeve pipe as the prerequisite, regard the sleeve pipe electric capacity in power transformer's capacitive sleeve pipe as coupling capacitance to install sleeve pipe end screen sensor additional at capacitive sheathed tube end screen end, the sleeve pipe end screen sensor Z that installs additional capacitive sheathed tube end screen end simultaneously is used for the coupling partial discharge signal, and the other end is connected on instrument M simultaneously, realizes homonymy high-tension apparatus partial discharge's detection with this. The utility model provides a can not increase the problem of coupling equipment when online or electrified detection, realize simultaneously that need not connect in addition high voltage coupling condenser in the time measuring of stopping the electricity, reduce experimental check out test set's input. The sleeve capacitor in the capacitive sleeve of the power transformer is used as the partial discharge signal coupling capacitor, so that the partial discharge signal of the power transformer can be coupled and picked up, and the partial discharge signal of the high-voltage electrical equipment on the same side can also be coupled and picked up.
Description
Technical Field
The utility model belongs to the technical field of the high-voltage testing, concretely relates to utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge's detection device.
Background
The power transformer is the core electrical equipment in a high-voltage power station, and the inlet and outlet bushings on each side of the power transformer are directly connected with high-voltage electrical equipment such as a circuit breaker, a disconnecting switch, a mutual inductor or a GIS (geographic information system) through a bus.
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 detection of partial discharge characteristics to reflect the insulation state of high voltage electrical equipment has been recognized as the most sensitive and effective means in the industry.
At present, the measurement of partial discharge usually adopts a pulse current method, as shown in fig. 1, and according to the basic principle of the pulse current method, a coupling capacitor C is requiredKAnd the sample Cx constitute a circuit for circulating the pulse current.
However, in practical applications, the addition of coupling capacitance devices presents some difficulties. When online or electrified detection is carried out, the detection means is required to have no electrical influence on the operation of the power grid equipment, and coupling equipment cannot be additionally arranged on high voltage due to detection requirements, so that the partial discharge detection of the power transformer and the high-voltage equipment on the same side is difficult; during power failure detection, since the high-voltage device itself generally does not have the coupling condition of the partial discharge signal, a high-voltage coupling capacitor is often required to be connected in parallel, which increases the investment of the test detection device.
Disclosure of Invention
The utility model aims at providing an it is not enough to prior art, provide an utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge's detection device
The utility model provides a technical scheme that its technical problem adopted as follows:
at present, capacitive bushings are mainly adopted for incoming and outgoing lines of power transformers with 110kV grade and above, and a grounded end screen end (namely a bushing end screen) is led out from the low-voltage tail of each bushing.
The device for detecting the partial discharge of the high-voltage equipment on the same side by using the capacitive sleeve end screen of the power transformer is based on the premise that the capacitive sleeve of the power transformer is used as a coupling capacitor, a sleeve end screen sensor Z is additionally arranged at the end screen end of the capacitive sleeve and used for coupling a partial discharge signal, and the other end of the capacitive sleeve is connected to an instrument M so as to realize the detection of the partial discharge of the high-voltage equipment on the same side. The instrument M is an XD56 high-frequency partial discharge detector.
The built-in coil that has porcelain ring and winding porcelain ring of sleeve pipe end screen sensor Z who installs additional constitutes, installs sleeve pipe end screen sensor Z additional after, the utility model discloses a porcelain ring and coil coupling partial discharge signal have replaced the mutual inductance mode of original magnetic core. The shortest grounding path is formed under the condition of not changing the original grounding mode.
Sleeve pipe end screen sensor Z refer to a capacitive sleeve pipe end screen signal detection device.
The utility model discloses a realization process is as follows:
the utility model discloses a realization process is as follows:
step 1, as shown in FIG. 2, using the tested device as the sample CxnThe sleeve capacitor in the capacitive sleeve of the power transformer is used as a partial discharge signal coupling capacitor CKThereby no additional parallel coupling equipment is needed; a sleeve end screen sensor Z additionally arranged at the end screen end of the capacitive sleeve is used for coupling a partial discharge signal, and the other end of the capacitive sleeve is connected to an instrument M through a coil; the sample CxnCan be the power transformer itself, or can be the high-voltage equipment on the same side, as the Cx respectively marked by the test sample in FIG. 21、Cx2、Cx3……CxnAnd the like. The high-voltage equipment is connected with the power transformer through a bus.
Step 2, when the sample CxnWhen partial discharge occurs, a pulse current passes through the coupling capacitor CKGenerating a transient voltage change, namely pulse voltage, at two ends of the sleeve tap sensor Z; the sleeve tap sensor Z can read a partial discharge signal in a coupling mode and transmit the partial discharge signal to the instrument M;
and 3, acquiring, amplifying and displaying the partial discharge signal by the instrument M, so that basic parameters of partial discharge can be measured.
The utility model discloses beneficial effect as follows:
the utility model discloses not only can solve online or electrified problem that can not increase coupling equipment that detects, can realize not needing in addition and connect high voltage coupling condenser in the time of the power failure detection simultaneously to this input that can reduce experimental check out test set.
In addition, the sleeve capacitor in the capacitive sleeve of the power transformer is used as the partial discharge signal coupling capacitor, so that not only can the partial discharge signal of the power transformer be coupled and picked up, but also the partial discharge signal of the high-voltage electrical equipment on the same side can be coupled and picked up.
Drawings
FIG. 1 is a schematic diagram of the basic principle of the pulse current method;
FIG. 2 is a schematic diagram of the basic principle of the present invention;
fig. 3 is a schematic diagram of an example of performing a partial discharge test according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, and it should be noted that the described embodiments are only for facilitating understanding of the present invention, and do not have any limiting effect.
In a high-voltage power station, in addition to a core electrical equipment power transformer, an inlet and outlet bushing on each side is directly connected with high-voltage electrical equipment such as a circuit breaker, a disconnecting switch, a mutual inductor or a GIS (geographic information system) through a bus. The sleeve capacitor in the capacitive sleeve of the power transformer is used as the partial discharge signal coupling capacitor, so that the partial discharge signal of the power transformer can be coupled and picked up, and the partial discharge signal of the high-voltage electrical equipment on the same side can also be coupled and picked up.
As shown in fig. 3, the transformer is a three-phase power transformer including a high voltage side, a medium voltage side and a low voltage side, and the high voltage side is connected to a GIS, the medium voltage side is connected to a transformer, and the low voltage side is connected to a circuit breaker.
Taking fig. 3 as an example, the method of the present invention comprises the following steps:
in the step (1), assuming that the tested Cx is GIS, the bushing capacitor in the capacitive bushing of the power transformer on the same side should be selected as the coupling capacitor C to improve the detection sensitivityKAnd a sleeve end screen sensor Z is additionally arranged on the sleeve end screen, and the other end of the sleeve end screen sensor Z is connected to the instrument M.
And (2) when the sample GIS generates partial discharge, reading a partial discharge signal through the sensor Z in a coupling manner, and transmitting the partial discharge signal to the instrument M.
And (3) collecting, amplifying and displaying the partial discharge signal by the instrument M, so as to measure the partial discharge amount.
The built-in coil that has porcelain ring and winding porcelain ring of sleeve pipe end screen sensor Z who installs additional constitutes, behind installing sensor Z additional, the utility model discloses a porcelain ring and coil coupling partial discharge signal have replaced the mutual inductance mode of original magnetic core.
Through the above example, it can be seen that the method of using the sleeve capacitance in the capacitive sleeve as the partial discharge signal coupling capacitance and using the capacitive sleeve end screen to perform the partial discharge detection of the high-voltage equipment on the same side can solve the problem that the coupling equipment cannot be additionally added during online or live detection, and can also reduce the equipment investment of additionally connecting the high-voltage coupling capacitor in parallel during power failure detection. Meanwhile, the partial discharge signal of the power transformer can be coupled and picked up, and the partial discharge signal of the high-voltage electrical equipment on the same side can also be coupled and picked up.
Claims (3)
1. The device for detecting the partial discharge of the high-voltage equipment on the same side by using the end screen of the capacitive sleeve is characterized in that on the premise of the capacitive sleeve of the power transformer, the sleeve capacitor in the capacitive sleeve of the power transformer is used as a coupling capacitor, a sensor Z is additionally arranged at the end screen end of the capacitive sleeve for coupling a partial discharge signal, and the other end of the capacitive sleeve is connected to an instrument M, so that the partial discharge detection of the high-voltage equipment on the same side is realized.
2. The apparatus as claimed in claim 1, wherein said device is a model M XD56 high frequency partial discharge detector.
3. The device for detecting the partial discharge of the high-voltage equipment on the same side by using the capacitive bushing end screen according to claim 1 or 2, wherein the additionally installed sensor Z is internally provided with a ceramic ring and a coil wound around the ceramic ring, and a shortest grounding path is formed by coupling a partial discharge signal through the ceramic ring and the coil without changing an original grounding mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043777.0U CN210626597U (en) | 2019-07-05 | 2019-07-05 | Detection apparatus for utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043777.0U CN210626597U (en) | 2019-07-05 | 2019-07-05 | Detection apparatus for utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge |
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| CN210626597U true CN210626597U (en) | 2020-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196383A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing |
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2019
- 2019-07-05 CN CN201921043777.0U patent/CN210626597U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196383A (en) * | 2019-07-05 | 2019-09-03 | 杭州西湖电子研究所 | The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing |
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