CN105548849A - Local discharge testing circuit and method for high-voltage direct current cable - Google Patents
Local discharge testing circuit and method for high-voltage direct current cable Download PDFInfo
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- CN105548849A CN105548849A CN201610093264.5A CN201610093264A CN105548849A CN 105548849 A CN105548849 A CN 105548849A CN 201610093264 A CN201610093264 A CN 201610093264A CN 105548849 A CN105548849 A CN 105548849A
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- direct current
- voltage direct
- partial discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a local discharge testing circuit and method for a high-voltage direct current cable. The local discharge testing circuit comprises a local discharge detection instrument, a high-voltage direct current voltage source, a high-voltage high-speed switch, an air reactor, a first resistor, a second resistor, a first capacitor, a second capacitor and a local discharge detection impedor. One end of the high-voltage direct current voltage source and one end of the air reactor are connected with one end of the high-voltage high-speed switch, and the other end of the high-voltage high-speed switch is grounded. The other end of the air reactor is connected with one end of the first resistor, one end of the first capacitor and the tested high-voltage direct current cable, and the other end of the first resistor is connected with the other end of the first capacitor, one end of the second resistor, one end of the second capacitor and the input end of the local discharge detector. The other end of the second capacitor and the other end of the second resistor are connected with one end of the local discharge detection impedor, and the other end of the local discharge detection impedor is connected with the input end of the local discharge detector. Local discharge testing can be conducted on the high-voltage direct current cable.
Description
Technical field
The invention belongs to cable local discharge technical field of measurement and test, relate to a kind of high voltage direct current cable partial discharge test circuit and method
Background technology
In recent years high voltage direct current transmission project due to its can transmit over a long distance more high power capacity electric energy, being beneficial to that distributed power generation is grid-connected can advantage and developing gradually, wherein, flexible DC power transmission compares interchange in island with power, urban distribution network are powered etc. greater advantage, usually carries out electric energy conveying by direct current cables.Shelf depreciation test is proved to be one of effective ways that can find ac cable and annex insulation defect, existing associated recommendation detection method in GB.And the direct current cables shelf depreciation Site Detection standard that present stage not yet has the normal structures such as IEC to issue, industry appears on the scene for direct current cables, on-the-spot detection method for local discharge does not reach unification yet, and the Partial Discharge Detection for direct current cables scene does not have corresponding method of testing.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of high voltage direct current cable partial discharge test circuit and method, this circuit and method can carry out the test of high voltage direct current cable shelf depreciation.
For achieving the above object, high voltage direct current cable partial discharge test circuit of the present invention comprises Partial discharge detector's device, high voltage direct current potential source, high-voltage quick switch, air reactor, the first resistance, the second resistance, the first electric capacity, the second electric capacity and Partial Discharge Detection impedance;
The output terminal of Partial discharge detector's device is connected with the control end in the control end of high voltage direct current potential source and high-voltage quick switch, the output terminal of high voltage direct current potential source is connected with one end of one end of air reactor and high-voltage quick switch, the other end ground connection of high-voltage quick switch, the other end of air reactor and one end of the first resistance, one end and the tested high voltage direct current cable of the first electric capacity are connected, the other end of the first resistance and the other end of the first electric capacity, one end of second resistance, one end of second electric capacity and the input end of partial discharge detector are connected, the other end of the second electric capacity and the other end of the second resistance are all connected with one end of Partial Discharge Detection impedance, the other end of Partial Discharge Detection impedance is connected with the input end of partial discharge detector.
High voltage direct current potential source is connected with air reactor and high-voltage quick switch by protective resistance.
Partial Discharge Detection impedance is connected with the input end of Partial discharge detector device by wave filter.
The earthing of casing of Partial Discharge Detection impedance.
High voltage direct current cable local discharge measuring method of the present invention comprises the following steps:
High-voltage quick switch is in open mode, the DC voltage that high voltage direct current potential source U exports is applied on tested high voltage direct current cable, complete DC voltage withstand test, after DC voltage withstand test terminates, if the output voltage of high voltage direct current potential source is predeterminated voltage, close high-voltage quick switch, now high voltage direct current potential source is shorted, the high-pressure conductor shorted to earth of tested high voltage direct current cable, tested high voltage direct current cable and air reactor form LC resonant tank, and discharged by air reactor, thus produce the resonance potential of some continuous decay;
Partial discharge detector's device judges whether Partial Discharge Detection impedance has electric signal, simultaneously by measuring resonant voltage waveforms between the first resistance and the first electric capacity and the second resistance and the second electric capacity, when Partial Discharge Detection impedance there being electric signal, then there is insulation defect in tested high voltage direct current cable, and Partial discharge detector's device shows described electric signal; When Partial Discharge Detection impedance not having electric signal, then there is not insulation defect in tested high voltage direct current cable.
The expression formula of resonance frequency f is:
Wherein, C is the equivalent capacity of tested high voltage direct current cable, and L is the equivalent inductance of air reactor.
The present invention has following beneficial effect:
High voltage direct current cable partial discharge test circuit of the present invention and method are when concrete operations, DC voltage is provided by high voltage direct current potential source, when high-pressure conductor shorted to earth in tested high voltage direct current cable, tested high voltage direct current cable and air reactor form LC resonant tank, thus produce the resonance potential of decay continuously, whether Partial discharge detector's device observes tested high voltage direct current cable discharge, thus realize the test of high voltage direct current cable shelf depreciation, structure is simple, easy to operate, without the need to additionally increasing high-voltage test electric power, operability and convenience stronger, action time is short, effectively can detect the various defects in XLPE cable, and any infringement can not be caused to cable.
Accompanying drawing explanation
Fig. 1 is that in the present invention, DC voltage carries out Partial Discharge Detection schematic diagram to high voltage direct current cable after cutting off;
Fig. 2 is tested electric cable stoppage schematic diagram in embodiment one;
Fig. 3 is that in embodiment one, tested cable carries out office and puts detection schematic diagram under the wave of oscillation.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, high voltage direct current cable partial discharge test circuit of the present invention comprises Partial discharge detector's device, high voltage direct current potential source U, high-voltage quick switch K, air reactor L, the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2 and Partial Discharge Detection impedance Z m, the output terminal of Partial discharge detector's device is connected with the control end in the control end of high voltage direct current potential source U and high-voltage quick switch K, the output terminal of high voltage direct current potential source U is connected with one end of one end of air reactor L and high-voltage quick switch K, the other end ground connection of high-voltage quick switch K, the other end of air reactor L and one end of the first resistance R1, one end and the tested high voltage direct current cable Cx of the first electric capacity C1 are connected, the other end of the first resistance R1 and the other end of the first electric capacity C1, one end of second resistance R2, one end of second electric capacity C2 and the input end of partial discharge detector are connected, the other end of the second electric capacity C2 and the other end of the second resistance R2 are all connected with one end of Partial Discharge Detection impedance Z m, the other end of Partial Discharge Detection impedance Z m is connected with the input end of partial discharge detector.
It should be noted that; high voltage direct current potential source U is connected with air reactor L and high-voltage quick switch K by protective resistance Ro; Partial Discharge Detection impedance Z m is connected with the input end of Partial discharge detector device by wave filter F, the earthing of casing of Partial Discharge Detection impedance Z m.
High voltage direct current cable local discharge measuring method of the present invention comprises the following steps:
High-voltage quick switch K is in open mode, the DC voltage that high voltage direct current potential source U exports is applied on tested high voltage direct current cable Cx, complete DC voltage withstand test, after DC voltage withstand test terminates, if the output voltage of high voltage direct current potential source U is predeterminated voltage U, close high-voltage quick switch K, now high voltage direct current potential source U is shorted, the high-pressure conductor shorted to earth of tested high voltage direct current cable Cx, tested high voltage direct current cable Cx and air reactor L forms LC resonant tank, and discharged by air reactor L, thus produce the resonance potential of some continuous decay; Partial discharge detector's device judges whether Partial Discharge Detection impedance Z m has electric signal, simultaneously by measuring resonant voltage waveforms between the first resistance R1 and the first electric capacity C1 and the second resistance R2 and the second electric capacity C2, when Partial Discharge Detection impedance Z m there being electric signal, then there is insulation defect in tested high voltage direct current cable Cx, and Partial discharge detector's device shows described electric signal; When Partial Discharge Detection impedance Z m not having electric signal, then there is not insulation defect in tested high voltage direct current cable Cx.
Wherein, the expression formula of resonance frequency f is:
Wherein, C is the equivalent capacity of tested high voltage direct current cable Cx, and L is the equivalent inductance of air reactor L.
Embodiment one
XLPE cable section 10kV being about to 3m carries out applied voltage test, simulate tested high voltage direct current cable Cx, this cable metal conductor is aluminium core, diameter 8.4mm, in order to prevent cable two ends from having end to discharge, the end of cable needs through good process, and access lubricating cup terminal, with the high oily medium of dielectric strength for medium, improve the dielectric strength around the creeping discharge intensity of cable socket insulation and core, screen layer, make cable two ends shelf depreciation not occur under experimental voltage.Make cable discharge model, this modeling XLPE cable annex inner insulating layer has metal sundries or wears out semi-conductive layer due to exterior protrusions and enters into the insulation defect that causes in XLPE insulation, and there are the electric discharge phenomena because non-uniform electric field causes on its surface, as shown in Figure 2.Select the stainless pin of high rigidity in cable discharge model, draw point length L=30mm, diameter D=1mm, needle point radius-of-curvature r=5 μm, needle point taper angle theta=30 °, penetrating the insulation course degree of depth is 4.6mm.
Because stub cable electric capacity is less, therefore increase by compensation condenser is needed, compensation condenser is put without office by 4 50kV, electric capacity is that the high-voltage capacitor of 2 μ F is in series formation, test product is compensation condenser and stub cable is in parallel, and the High voltage output of damped oscillation wave producer is terminated on high-voltage capacitor and cable core, the shielding layer grounding of one end, test schematic as shown in Figure 3, high voltage direct current potential source U is boosted to 8kV voltage, a period of time is kept to make tested cable and compensation condenser charging completely, after closed high high-speed switch K, the shelf depreciation of defective cable under the wave of oscillation is detected.
Claims (6)
1. a high voltage direct current cable partial discharge test circuit, it is characterized in that, comprise Partial discharge detector's device, high voltage direct current potential source (U), high-voltage quick switch (K), air reactor (L), the first resistance (R1), the second resistance (R2), the first electric capacity (C1), the second electric capacity (C2) and Partial Discharge Detection impedance (Zm);
The output terminal of Partial discharge detector's device is connected with the control end in the control end of high voltage direct current potential source (U) and high-voltage quick switch (K), the output terminal of high voltage direct current potential source (U) is connected with one end of one end of air reactor (L) and high-voltage quick switch (K), the other end ground connection of high-voltage quick switch (K), the other end of air reactor (L) and the first resistance (one end of R1, (one end and the tested high voltage direct current cable (Cx) of C1 are connected first electric capacity, the other end of the first resistance (R1) and the other end of the first electric capacity (C1), one end of second resistance (R2), one end of second electric capacity (C2) and the input end of partial discharge detector are connected, the other end of the second electric capacity (C2) and the other end of the second resistance (R2) are all connected with one end of Partial Discharge Detection impedance (Zm), the other end of Partial Discharge Detection impedance (Zm) is connected with the input end of partial discharge detector.
2. high voltage direct current cable partial discharge test circuit according to claim 1; it is characterized in that, high voltage direct current potential source (U) is connected with air reactor (L) and high-voltage quick switch (K) by protective resistance (Ro).
3. high voltage direct current cable partial discharge test circuit according to claim 1, is characterized in that, Partial Discharge Detection impedance (Zm) is connected with the input end of Partial discharge detector device by wave filter (F).
4. high voltage direct current cable partial discharge test circuit according to claim 1, is characterized in that, the earthing of casing of Partial Discharge Detection impedance (Zm).
5. a high voltage direct current cable local discharge measuring method, is characterized in that, based on high voltage direct current cable partial discharge test circuit according to claim 1, comprises the following steps:
High-voltage quick switch (K) is in open mode, the DC voltage that high voltage direct current potential source (U) exports is applied on tested high voltage direct current cable (Cx), complete DC voltage withstand test, after DC voltage withstand test terminates, if the output voltage of high voltage direct current potential source (U) is predeterminated voltage U, close high-voltage quick switch (K), now high voltage direct current potential source (U) is shorted, the high-pressure conductor shorted to earth of tested high voltage direct current cable (Cx), tested high voltage direct current cable (Cx) and air reactor (L) form LC resonant tank, and by air reactor (L) electric discharge, thus produce the resonance potential of some continuous decay,
Partial discharge detector's device judges whether Partial Discharge Detection impedance (Zm) has electric signal, simultaneously by measuring resonant voltage waveforms between the first resistance (R1) and the first electric capacity (C1) and the second resistance (R2) and the second electric capacity (C2), when Partial Discharge Detection impedance (Zm) there being electric signal, then there is insulation defect in tested high voltage direct current cable (Cx), and Partial discharge detector's device shows described electric signal; When Partial Discharge Detection impedance (Zm) not having electric signal, then there is not insulation defect in tested high voltage direct current cable (Cx).
6. high voltage direct current cable local discharge measuring method according to claim 1, is characterized in that, the expression formula of resonance frequency f is:
Wherein, C is the equivalent capacity of tested high voltage direct current cable (Cx), and L is the equivalent inductance of air reactor (L).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610093264.5A CN105548849A (en) | 2016-02-19 | 2016-02-19 | Local discharge testing circuit and method for high-voltage direct current cable |
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| CN201610093264.5A CN105548849A (en) | 2016-02-19 | 2016-02-19 | Local discharge testing circuit and method for high-voltage direct current cable |
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Cited By (9)
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| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN106353657A (en) * | 2016-11-28 | 2017-01-25 | 国网福建省电力有限公司 | High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method |
| CN106771939A (en) * | 2017-01-22 | 2017-05-31 | 西安交通大学 | A kind of high voltage direct current cable partial discharge test circuit and method |
| CN107505550A (en) * | 2017-09-07 | 2017-12-22 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
| CN110133374A (en) * | 2018-02-09 | 2019-08-16 | 华为技术有限公司 | A kind of detection circuit and power supply circuit |
| 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 |
| CN111830382A (en) * | 2020-07-28 | 2020-10-27 | 红相股份有限公司 | Metal shielding layer spike discharging model for cable |
| CN111862746A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Manufacturing method of metal shielding layer spike discharge model for cable |
| CN113922659A (en) * | 2021-10-12 | 2022-01-11 | 中国北方车辆研究所 | Active EMI filter capable of self-supplying power |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974290B (en) * | 2016-07-22 | 2018-12-04 | 国网河南省电力公司电力科学研究院 | A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method |
| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN106353657A (en) * | 2016-11-28 | 2017-01-25 | 国网福建省电力有限公司 | High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method |
| CN106771939A (en) * | 2017-01-22 | 2017-05-31 | 西安交通大学 | A kind of high voltage direct current cable partial discharge test circuit and method |
| CN107505550A (en) * | 2017-09-07 | 2017-12-22 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
| CN107505550B (en) * | 2017-09-07 | 2019-12-06 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
| CN110133374B (en) * | 2018-02-09 | 2020-08-07 | 华为技术有限公司 | Detection circuit and power supply circuit |
| CN110133374A (en) * | 2018-02-09 | 2019-08-16 | 华为技术有限公司 | A kind of detection circuit and power supply circuit |
| 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 |
| CN111830382A (en) * | 2020-07-28 | 2020-10-27 | 红相股份有限公司 | Metal shielding layer spike discharging model for cable |
| CN111862746A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Manufacturing method of metal shielding layer spike discharge model for cable |
| CN113922659A (en) * | 2021-10-12 | 2022-01-11 | 中国北方车辆研究所 | Active EMI filter capable of self-supplying power |
| CN113922659B (en) * | 2021-10-12 | 2024-03-15 | 中国北方车辆研究所 | Active EMI filter capable of self-supplying power |
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