CN113311291A - Partial discharge detection sensitivity testing device and method for long-section high-voltage cable - Google Patents
Partial discharge detection sensitivity testing device and method for long-section high-voltage cable Download PDFInfo
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Abstract
一种大段长高压电缆的局部放电检测灵敏度测试装置及方法，包括：高压电源模块，校准模块，试品模块和检测模块；高压电源模块输出幅值U可调的高压正弦交流电；校准模块用于产生设定放电量的校准脉冲，包括：校准电容和阶跃电压发生器，阶跃电压发生器与高压电源模块并联连接，输出幅值为U0的阶跃电压信号，校准电容的一端与阶跃电压发生器相连接，另一端与试品模块相连接；检测模块用于局部放电检测，试品模块的接地引线穿心接入检测模块，检测模块用于获得试品模块的接地引线的脉冲信号幅值。本发明1)测量准确性高；2)稳定性好；3)操作简单；4)装置结构简单，安装方便；5)可以广泛应用于大段长高压电缆局部放电检测灵敏度测试。
A partial discharge detection sensitivity test device and method for a large section of long high-voltage cables, comprising: a high-voltage power supply module, a calibration module, a test module and a detection module; the high-voltage power supply module outputs a high-voltage sinusoidal alternating current with an adjustable amplitude U; To generate the calibration pulse of the set discharge amount, it includes: a calibration capacitor and a step voltage generator. The step voltage generator is connected in parallel with the high-voltage power supply module, and outputs a step voltage signal with an amplitude of U0 . One end of the calibration capacitor is connected to The step voltage generator is connected, and the other end is connected with the test module; the detection module is used for partial discharge detection, the ground lead of the test module is connected to the detection module through the core, and the detection module is used to obtain the grounding lead of the test module. Pulse signal amplitude. The invention 1) has high measurement accuracy; 2) has good stability; 3) is easy to operate; 4) the device has a simple structure and is easy to install;
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation equipment, and particularly relates to a device and a method for testing partial discharge detection sensitivity of a long-section high-voltage cable.
Background
The high-voltage cable joint is one of the weakest links of cable, because traditional cable single section length is less, and remote laying connects a relatively great quantity, leads to cable operation fault probability high. The large-section long cable can be laid by adopting the large-section long cable, so that the application of the joint is reduced, the fault probability is reduced, and the large-section long cable is more and more widely applied along with the continuous increase of the cable laying length of the urban power grid at present.
However, the large length of cable also brings difficulties to the operation and maintenance of the cable line, especially the partial discharge detection. At present, a partial discharge detection technology of a long and high-voltage cross-linked insulated cable in a large section in a pipe arrangement laying mode is not broken through, and the detection technology is still in a research and exploration stage of partial discharge off-line single-end tests before delivery of the long and high-voltage cross-linked insulated cable and after laying at home and abroad.
Compared with the conventional high-voltage cross-linked insulated cable with the section length (the continuous length of the cable body is about 800-.
Therefore, it is necessary to provide a sensitivity testing method suitable for detecting partial discharge of a long and long high-voltage cable, so as to enrich and perfect the technical means of operation and detection of the long and long high-voltage cable and provide technical support for further improving the reliability of partial discharge detection.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a partial discharge detection sensitivity testing device and method for a long and high-voltage cable, which are suitable for partial discharge detection sensitivity testing of the long and high-voltage cable.
The invention adopts the following technical scheme. A partial discharge detection sensitivity test device for a long high-voltage cable comprises: the high-voltage power supply module outputs high-voltage sinusoidal alternating current with adjustable amplitude U; the calibration module is used for generating a calibration pulse with a set discharge amount, and comprises: the calibration capacitor and the step voltage generator are connected in parallel with the high-voltage power supply module, and the output amplitude is U0One end of the calibration capacitor is connected with the step voltage generator, and the other end of the calibration capacitor is connected with the sample module; the detection module is used for detecting partial discharge of a long high-voltage cable, a grounding lead of the test sample module is connected into the detection module in a penetrating mode, and the detection module is used for obtaining the pulse signal amplitude of the grounding lead of the test sample module.
Preferably, the test piece module is a long high voltage cable.
Preferably, the test sample module is a test sample capacitor, the test sample capacitor is used for replacing a long high-voltage cable, and the capacitance value of the test sample capacitor is the equivalent capacitance of the long high-voltage cable.
Preferably, if the test sample module is a long high-voltage cable, the capacitance C of the calibration capacitor is expressed by the following formula0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kerepresents a first scale factor;
if the test sample module is a test sample capacitor, the relationship between the capacitance of the calibration capacitor and the capacitance of the test sample capacitor is expressed by the following formula,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
Preferably, the detection module is used for partial discharge detection of a long and large-length high-voltage cable, and comprises: high-frequency current transformer and analytical equipment.
Preferably, a grounding lead of the test sample module is connected with a high-frequency current transformer in a penetrating manner, and the input end of the high-frequency current transformer is connected with the analysis device; the high-frequency current transformer is used for collecting pulse signals on the grounding lead, and the amplitude of the pulse signals is obtained by the analysis device.
Preferably, the set discharge amount of the calibration pulse is expressed in the following formula,
q0＝U0·C0
in the formula:
q0indicating a set discharge amount;
C0a capacitance value representing a calibration capacitance;
when the signal-to-noise ratio obtained by the detection module is 2:1, the measurable discharge value is the sensitivity of the detection module in off-line measurement of the test sample module.
The second aspect of the present invention provides a partial discharge detection sensitivity test method for a long and large-section high-voltage cable based on the partial discharge detection sensitivity test apparatus for a long and large-section high-voltage cable, including the steps of:
step 1, connecting a high-voltage power supply module at two ends of a step voltage generator in parallel, connecting one end of a calibration capacitor with the step voltage generator, connecting the other end of the calibration capacitor with a high-voltage lead of a test sample module, connecting a grounding lead of the test sample module into a high-frequency current transformer in a penetrating manner, and connecting the input end of the high-frequency current transformer with an analysis device;
step 2, the high-voltage power supply module is closed, the high-frequency current transformer collects pulse signals of the grounding lead of the test sample module, and the analysis device obtains an amplitude value of UnoiseThe background noise of (1);
step 3, starting the high-voltage power supply module, generating a calibration pulse signal by the step voltage generator, acquiring a pulse signal of a grounding lead of the test sample module by the high-frequency current transformer, and obtaining an amplitude value of U by the analysis device1The signal-to-noise ratio is obtained, and is expressed by the following formula,
step 4, adjusting the voltage amplitude output by the power supply module, and obtaining the amplitude of U by the analysis device1The pulse signal is changed, that is, the signal-to-noise ratio K is changed, when K is 2:1, the output amplitude of the recording and step voltage generator is U0；
Step 5, the sensitivity S of the detection module when the test sample module is measured off-line is expressed by the following formula,
S＝q0＝U0·C0
in the formula:
q0indicating the set discharge amount of the calibration pulse.
Preferably, in step 1, a test capacitor is selected as the test module, the equivalent capacitance of the long and large-section high-voltage cable is calculated, and the test capacitor with the capacitance value equal to the equivalent capacitance of the long and large-section high-voltage cable is selected.
Preferably, if a long high-voltage cable with a large length is adopted as a testThe product module selects a calibration capacitor according to the following formula, namely the capacitance value C of the calibration capacitor0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kerepresents a first scale factor;
if the sample capacitor is used as the sample module, the calibration capacitor is selected according to the following formula, that is, the relationship between the capacitance of the calibration capacitor and the capacitance of the sample capacitor,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
Compared with the prior art, the invention has the beneficial effects that 1) the measurement accuracy is high; 2) the stability is good; 3) the operation is simple; 4) the device has simple structure and convenient installation; 5) the method can be widely applied to testing the partial discharge detection sensitivity of the large-section long high-voltage cable.
Drawings
Fig. 1 is a schematic view of a partial discharge detection sensitivity testing apparatus for a long and long high-voltage cable according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a partial discharge detection sensitivity testing apparatus for a long and long high-voltage cable according to embodiment 2 of the present invention;
FIG. 3 is a flow chart of a partial discharge detection sensitivity testing method for a long and long high-voltage cable according to the present invention;
in the figure:
10-a high voltage source;
20-impedance;
30-calibrating the capacitance;
40-step voltage generator
51-long high voltage cable;
52-sample capacitance;
60-high frequency current transformer;
70-analytical equipment.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, the present invention provides a partial discharge detection sensitivity testing apparatus for a long high voltage cable, comprising: the device comprises a high-voltage power supply module, a calibration module, a test article module and a detection module.
The high voltage power supply module includes: a high voltage source 10 and an impedance 20. A high voltage source 10 is connected in series with an impedance 20. The high-voltage source 10 outputs high-voltage sinusoidal alternating current with adjustable amplitude U, and the impedance 20 is the impedance of the high-voltage power supply module.
The calibration module is used for generating a calibration pulse with a set discharge amount, and comprises: the capacitor 30 and the step voltage generator 40 are calibrated. The step voltage generator 40 is connected in parallel with the high voltage power supply module, and has an output amplitude of U0Step voltage signal of amplitude U0The output amplitude U is adjustable along with the high-voltage source 10. One end of the calibration capacitor 30 is connected to the step voltage generator 40, and the other end is connected to the sample module. The calibration capacitor 30 has a capacitance value C0. The set discharge amount of the calibration pulse is expressed by the following formula,
q0＝U0·C0
in the formula:
q0indicating the set discharge amount.
In example 1, the test piece module is a long high voltage cable 51. The high-voltage lead of the long high-voltage cable 51 is connected with the calibration capacitor 30, and the grounding lead of the long high-voltage cable 51 is inserted into the detection module in a penetrating mode.
It is noted that the capacitance value C of the calibration capacitor 30 can be selected by those skilled in the art according to experimental requirements0In a preferred but non-limiting embodiment, the capacitance value of the calibration capacitor is selected according to the parameters of the long high-voltage cable, and the equivalent capacitance value C of the long high-voltage cable is calculatedeThe calibration current is expressed by the following formulaCapacitance C of the capacitor0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kethe first scale factor is shown.
In a further preferred but non-limiting embodiment of the invention, ke＝0.1。
The detection module is used for partial discharge detection of long high-voltage cable of big section, includes: a high-frequency current transformer 60 and an analysis device 70. The ground lead of the long high-voltage cable 51 is inserted into the high-frequency current transformer 60, and the input end of the high-frequency current transformer 60 is connected with the analysis device 70. The high-frequency current transformer 60 is used for collecting a pulse signal on the grounding lead, and the amplitude of the pulse signal is obtained by the analysis device 70.
And setting a calibration module, injecting a discharge pulse, recording a sensitivity measurement result of the detection module, and obtaining a ratio (signal-to-noise ratio) of the amplitude of a pulse signal to background noise of the pulse signal, wherein a value of the discharge amount which can be measured when the signal-to-noise ratio is 2:1 is the sensitivity of the detection module in offline measurement of the test sample module.
Example 2:
as shown in fig. 2, embodiment 2 of the present invention provides another partial discharge detection sensitivity testing apparatus for a long and long high-voltage cable, including: the device comprises a high-voltage power supply module, a calibration module, a test article module and a detection module.
The difference from embodiment 1 is that in embodiment 2, the sample module is a sample capacitor 52, the sample capacitor is used to replace a long high-voltage cable, and the capacitance value of the sample capacitor 52 is the equivalent capacitance of the long high-voltage cable. It is worth noting that the partial discharge capacity of the long and large-section high-voltage cable is substantially the discharge capacity of the capacitance of the long and large-section high-voltage cable, so that the replacement of the long and large-section high-voltage cable by the equivalent capacitance of the long and large-section high-voltage cable is completely equivalent.
The capacitance value of the test article capacitor is CxIn a preferred but non-limiting embodiment, the calibration current is expressed in the following formulaThe capacitance of the capacitor is related to the capacitance of the test capacitor,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
In a further preferred but non-limiting embodiment of the invention, kx＝0.1。
Example 3:
as shown in fig. 2, embodiment 2 of the present invention provides a method for testing partial discharge detection sensitivity of a long and long high-voltage cable, including the following steps:
step 1, connecting a high-voltage power supply module at two ends of a step voltage generator 40 in parallel, connecting one end of a calibration capacitor 30 with the step voltage generator 40, connecting the other end with a high-voltage lead of a long high-voltage cable 51, connecting a grounding lead of the long high-voltage cable 51 into a high-frequency current transformer 60 in a penetrating manner, and connecting the input end of the high-frequency current transformer 60 with an analysis device 70;
step 2, the high-voltage power supply module is closed, the high-frequency current transformer 60 collects pulse signals of the grounding lead of the large-section long high-voltage cable 51, and the analysis device 70 obtains the amplitude value of UnoiseThe background noise of (1);
step 3, starting the high-voltage power supply module, generating a calibration pulse signal by the step voltage generator 40, acquiring a pulse signal of the grounding lead of the large-section long high-voltage cable 51 by the high-frequency current transformer 60, and acquiring an amplitude value of U by the analysis device 701The signal-to-noise ratio is obtained, and is expressed by the following formula,
step 4, adjusting the amplitude of the voltage output by the power module, and obtaining an amplitude of U by the analysis device 701The pulse signal is changed, i.e. the signal-to-noise ratio K is changed, when K is 2:1, the output amplitude of the recording and step voltage generator 40 is U0；
Step 5, the sensitivity S of the detection module when the test sample module is measured off-line is expressed by the following formula,
S＝q0＝U0·C0
in the formula:
q0indicating the set discharge amount of the calibration pulse.
Example 4:
embodiment 4 of the present invention provides another method for testing the partial discharge detection sensitivity of a long and high-voltage cable, which is different from the method of embodiment 3 in that the equivalent capacitance of the long and high-voltage cable 51 is calculated in step 1, and the test capacitors with the same capacitance value are used to replace the long and high-voltage cable 51 to perform the rest of the steps.
It should be noted that, if a long high voltage cable (51) is used as a test module, i.e. in embodiment 3, the calibration capacitor is selected according to the following formula, i.e. the capacitance C of the calibration capacitor0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kerepresents a first scale factor;
if the sample capacitor (52) is used as the sample module, i.e. in embodiment 4, the calibration capacitor is selected according to the following formula, i.e. the relationship between the capacitance of the calibration capacitor and the capacitance of the sample capacitor,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
Compared with the prior art, the invention has the beneficial effects that 1) the measurement accuracy is high; 2) the stability is good; 3) the operation is simple; 4) the device has simple structure and convenient installation; 5) the method can be widely applied to testing the partial discharge detection sensitivity of the large-section long high-voltage cable.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A partial discharge detection sensitivity test device for a long high-voltage cable comprises: high voltage power supply module, calibration module, sample module and detection module, its characterized in that:
the high-voltage power supply module outputs high-voltage sinusoidal alternating current with adjustable amplitude U;
the calibration module is used for generating a calibration pulse with a set discharge amount, and comprises: the calibration circuit comprises a calibration capacitor (30) and a step voltage generator (40), wherein the step voltage generator (40) is connected with a high-voltage power supply module in parallel, and the output amplitude is U0One end of the calibration capacitor (30) is connected with the step voltage generator (40), and the other end is connected with the sample module;
the detection module is used for detecting partial discharge of a long high-voltage cable, a grounding lead of the test sample module is connected into the detection module in a penetrating mode, and the detection module is used for obtaining the pulse signal amplitude of the grounding lead of the test sample module.
2. The partial discharge detection sensitivity test device for long and large-section high-voltage cables according to claim 1, characterized in that:
the test sample module is a long high-voltage cable (51).
3. The partial discharge detection sensitivity test device for long and large-section high-voltage cables according to claim 1, characterized in that:
the test sample module is a test sample capacitor (52) which is used for replacing a large-section long high-voltage cable, and the capacitance value of the test sample capacitor is the equivalent capacitance of the large-section long high-voltage cable.
4. The partial discharge detection sensitivity test device for a long and large-length high-voltage cable according to claim 2 or 3, characterized in that:
if the test sample module is a long high-voltage cable (51), the capacitance C of the calibration capacitor is expressed by the following formula0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kerepresents a first scale factor;
if the test sample module is a test sample capacitor, the relationship between the capacitance of the calibration capacitor and the capacitance of the test sample capacitor is expressed by the following formula,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
5. The partial discharge detection sensitivity test apparatus for a long and large-length high-voltage cable according to any one of claims 1 to 3, characterized in that:
the detection module is used for partial discharge detection of long high-voltage cable of big section, includes: a high-frequency current transformer (60) and an analysis device (70).
6. The partial discharge detection sensitivity test device for long and large-section high-voltage cables according to claim 5, characterized in that:
a grounding lead of the test sample module is connected with a high-frequency current transformer (60) in a penetrating manner, and the input end of the high-frequency current transformer (60) is connected with an analysis device (70); the high-frequency current transformer (60) is used for collecting pulse signals on the grounding lead, and the amplitude of the pulse signals is obtained by the analysis device (70).
7. The partial discharge detection sensitivity test apparatus for a long and large-length high-voltage cable according to any one of claims 1 to 3, characterized in that:
the set discharge amount of the calibration pulse is expressed by the following formula,
q0＝U0·C0
in the formula:
q0indicating a set discharge amount;
C0a capacitance value representing a calibration capacitance;
when the signal-to-noise ratio obtained by the detection module is 2:1, the measurable discharge value is the sensitivity of the detection module in off-line measurement of the test sample module.
8. A partial discharge detection sensitivity test method of a long and large-length high-voltage cable based on the partial discharge detection sensitivity test apparatus of a long and large-length high-voltage cable according to any one of claims 1 to 7, characterized in that:
step 1, connecting a high-voltage power supply module at two ends of a step voltage generator (40) in parallel, connecting one end of a calibration capacitor (30) with the step voltage generator (40), connecting the other end of the calibration capacitor with a high-voltage lead of a test sample module, connecting a grounding lead of the test sample module into a high-frequency current transformer (60) in a penetrating manner, and connecting the input end of the high-frequency current transformer (60) with an analysis device (70);
step 2, the high-voltage power supply module is closed, the high-frequency current transformer (60) collects pulse signals of the grounding lead of the test sample module, and the analysis device (70) obtains the amplitude value of UnoiseThe background noise of (1);
step 3, starting the high-voltage power supply module, generating a calibration pulse signal by the step voltage generator (40), collecting the pulse signal of the grounding lead of the test sample module by the high-frequency current transformer (60), and obtaining the amplitude value of U by the analysis device (70)1The signal-to-noise ratio is obtained, and is expressed by the following formula,
step 4, adjusting the voltage amplitude output by the power supply module, and obtaining the amplitude U by the analysis device (70)1The pulse signal is changed, namely the signal-to-noise ratio K is changed, when K is 2:1, the output amplitude of the recording and step voltage generator (40) is U0；
Step 5, the sensitivity S of the detection module when the test sample module is measured off-line is expressed by the following formula,
S＝q0＝U0·C0
in the formula:
q0indicating the set discharge amount of the calibration pulse.
9. The partial discharge detection sensitivity test method for the long and large-section high-voltage cable according to claim 8, characterized in that:
in the step 1, a test article capacitor (52) is selected as a test article module, the equivalent capacitance of the long and high-voltage cable is calculated, and the test article capacitor with the capacitance value being the equivalent capacitance of the long and high-voltage cable is selected.
10. The partial discharge detection sensitivity test method for the long and large-length high-voltage cable according to claim 8 or 9, characterized in that:
if a large-section long high-voltage cable (51) is adopted as a test sample module, a calibration capacitor is selected according to the following formula, namely the capacitance value C of the calibration capacitor0Equivalent capacitance value C with long high-voltage cableeThe relationship between the two or more of them,
C0≤ke·Ce
in the formula:
kerepresents a first scale factor;
if a test article capacitor (52) is used as a test article module, a calibration capacitor is selected according to the following formula, namely the relationship between the capacitance value of the calibration capacitor and the capacitance value of the test article capacitor,
C0≤kx·Cx
in the formula:
kxrepresenting the second scaling factor.
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