CN101435850A - Balance type circuit of pulse current method for measuring three-phase electric power apparatus local discharge - Google Patents
Balance type circuit of pulse current method for measuring three-phase electric power apparatus local discharge Download PDFInfo
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- CN101435850A CN101435850A CNA2008102407784A CN200810240778A CN101435850A CN 101435850 A CN101435850 A CN 101435850A CN A2008102407784 A CNA2008102407784 A CN A2008102407784A CN 200810240778 A CN200810240778 A CN 200810240778A CN 101435850 A CN101435850 A CN 101435850A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009413 insulation Methods 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims description 20
- 238000004382 potting Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 abstract 6
- 238000012360 testing method Methods 0.000 description 59
- 238000004804 winding Methods 0.000 description 18
- 239000003990 capacitor Substances 0.000 description 17
- 230000007547 defect Effects 0.000 description 10
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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Abstract
The invention provides a balanced type circuit used in a pulse current method for measuring the local discharging of three-phase power equipment, and belongs to the technical field of power equipment local discharging detection. The circuit is characterized in that the local discharging of any two phase-to-ground insulation or any two phase-to-phase insulation of three-phase power equipment is measured at the same time, two phase-to-ground capacitances or two phase-to-phase capacitances are mutually used as balance capacitances, and two high potentials to detect impedance are adopted to form the balanced type detection circuit. The local discharging signal detecting the impedance at the high potentials can depend on light signal or electromagnetic wave signal to be transferred to the measuring equipment at the ground potential. The local discharging detection circuit can improve anti-power supply interference capability, and lower the requirement on the local discharging detection equipment.
Description
Technical field
The invention belongs to three-phase electric power apparatus local discharge detection technique field.
Technical background
The puncture that repeats of defect area under the alternating voltage effect, takes place in the local defect in the insulating medium, is called shelf depreciation.
Shelf depreciation is the performance of insulation defect, also is the reason that insulation defect further develops.The medium-term and long-term shelf depreciation of power equipment insulation can make insulation defect constantly enlarge, and finally causes integral insulation to puncture, and causes insulation fault.Therefore, in manufacturing, installation, operation and the maintenance of power equipment, often need carry out Partial Discharge Detection, to guarantee insulation quality.
The conventional method of existing measurement of partial discharge is a pulse current method, and testing apparatus and test environment are had strict requirement.Under a lot of practical matter, be difficult to satisfy equipment and environment requirement, influence the measurement sensitivity of shelf depreciation.
The present invention proposes a kind of pulse current method of improved measurement of partial discharge, be characterized in adopting noble potential to detect impedance, constitute the test circuit of balance mode with each electric capacity or each alternate electric capacity balancing capacitance each other relatively of three-phase electric power apparatus.This method can overcome some restrictions that existing pulse current method is faced in actual applications, realizes sensitiveer measurement.
The pulse current method of measurement of partial discharge belongs to the off-line measurement method, withdraws under Operation of Electric Systems and the special test condition at power equipment and carries out.By measuring and demarcating the pulse current that shelf depreciation produced, determine the apparent discharge capacity of shelf depreciation.
Shown in Figure 1 is three capacitor models of describing the power equipment shelf depreciation, wherein 11 and 12 high voltage end and the earth terminals that are respectively tested power equipment; 13 is tested power equipment insulation; 14 is the local defect in the tested power equipment insulation; C
DElectric capacity for local defect in the insulation; C
AFor between high voltage end and the earth terminal with the defective capacitor C
DThe partition capacitance that is in series; C
EFor removing the C of series connection between high voltage end and the earth terminal
DAnd C
ABack rest parts electric capacity.Total capacitance between tested power equipment high voltage end and the earth terminal is C
X, have:
When shelf depreciation took place, the local defect 14 in the insulation was breakdown, capacitor C
DBy short circuit, discharge quantity of electric charge Q
DQ
DDepend on electric capacity C
DWith defective voltage breakdown U
DB, Q is arranged
D=C
DU
DB, Q
DThe true discharge capacity that is called shelf depreciation.Because C
DAnd U
DBCan not survey in the reality, so the true discharge capacity Q of shelf depreciation
DAlso can not survey.
Capacitor C
DPuncture and quantity of electric charge Q
DDisappear, cause the electric charge redistribution in the tested power equipment, the device port capacitor C
XA charge variation Δ of last appearance Q
X, be called the apparent discharge capacity of shelf depreciation.What the pulse current method of conventional Partial Discharge Detection was measured is exactly the apparent discharge capacity of shelf depreciation.The apparent discharge capacity is not equal to true discharge capacity.
Shown in Figure 2 is the hookup of the pulse current method of measurement of partial discharge, and Fig. 2-(a) is the parallel way test circuit, and Fig. 2-(b) is the series system test circuit, and Fig. 2-(c) is the balance mode test circuit.
In the test circuit of the series system of the parallel way of Fig. 2-(a) and Fig. 2-(b), U
SBe the high-voltage test power supply; Z
SBe blocked impedance; C
XElectric capacity for tested power equipment; C
MBe coupling capacitance; Z
MFor detecting impedance.In parallel way, detect impedance Z
MBe connected on coupling capacitance C
MGround wire in; In series system, detect impedance Z
MBe connected on tested power equipment C
XGround wire in.
By high-voltage test power supply U
STo tested power equipment C
XMaking alive, in when, in the equipment under test insulation shelf depreciation taking place when, C
XΔ Q of last appearance
XCharge variation (apparent discharge capacity), coupling capacitance C
MImmediately to device capacitances C
XOn charge variation replenish, in the loop, produce pulse current, and detecting impedance Z
MLast output pulse signal.This pulse signal is demarcated, can be obtained the apparent discharge capacity of shelf depreciation.The method of demarcating is, injects the known quantity of electric charge with demarcating Charge Source on equipment under test, measures the pulse signal of generation, determines the relation of the pulse signal amplitude and the quantity of electric charge.In order to guarantee the sensitivity of measurement of partial discharge, coupling capacitance C
MShould be significantly greater than the equipment under test capacitor C
X, blocked impedance Z
SShould stop effectively that pulse current passes through power supply U
SBranch road.
In the test circuit of the series system of the parallel way of Fig. 2-(a) and Fig. 2-(b), if power supply U
sSelf there is shelf depreciation or has electromagnetic pulse, then measurement of partial discharge is constituted serious the interference.Therefore, measurement of partial discharge requires special test condition, comprising: the experimental enviroment of shielding; The high-voltage test power supply of no shelf depreciation and corona free; The coupling capacitance of no shelf depreciation; Power supply isolation and filtering etc.
In order to suppress the interference from high-voltage power supply, people have proposed the balancing method hookup shown in Fig. 2-(c), wherein: U
SBe the high-voltage test power supply; Z
SBe blocked impedance; C
X1Electric capacity for tested power equipment; C
X2Be balancing capacitance, satisfy C
X2=C
X1Z
M1And Z
M2For detecting impedance, satisfy Z
M2=Z
M1When there is undesired signal in the high-voltage test power supply, the parallel C that passes through of this undesired signal
X1And C
X2, detecting impedance Z
M1And Z
M2Last generation waveform, the signal that amplitude is identical with polarity make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2.When having shelf depreciation in the equipment under test, C is passed through in this local discharge signal serial
X1And C
X2, detecting impedance Z
M1And Z
M2Last generation waveform but opposite polarity signal identical with amplitude makes that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Thus, between P1 and P2, can effectively obtain the local discharge signal in the tested power equipment at 2, suppress undesired signal from power supply.
More than be three kinds of test circuits of pulse current method, they all face restriction in actual use:
(1) in parallel way and series system, if existing significantly, disturbs the high-voltage test power supply, will have a strong impact on the sensitivity of measurement of partial discharge.Guarantee the sensitivity of Partial Discharge Detection, must improve the performance of testing equipment, comprising: the high-potting power supply does not have shelf depreciation, corona free; Power supply is effectively isolated and filtering.
(2) in parallel way and series system, need coupling condenser, require coupling condenser not have shelf depreciation, corona free.
(3) use balance mode can suppress interference from the high-voltage test power supply, do not need coupling condenser, but need the equipment of another and the same or analogous no shelf depreciation of equipment under test, corona free, this condition is difficult to realize under many circumstances.
Summary of the invention
The invention provides a kind of neutrodyne circuit of pulse current method of new measurement three-phase electric power apparatus local discharge, it is with each electric capacity balancing capacitance each other relatively of three-phase electric power apparatus, or with each alternate electric capacity balancing capacitance each other, decoupling capacitance can be economized, interference can be effectively overcome from the high-voltage test power supply.
One of feature of the present invention is, be the neutrodyne circuit of the shelf depreciation of insulation relatively that is used to measure any two-phase of three-phase electric power apparatus: two identical detection impedance parallel connections at a high-potting power supply process noble potential place act on any two insulation relatively of three-phase electric power apparatus, and the output signal between two end points that described two detection impedances are connected with three-phase electric power apparatus is exactly these two local discharge signals of insulation relatively.
Two of feature of the present invention is, be the neutrodyne circuit that is used to measure the shelf depreciation of any two phase insulations of three-phase electric power apparatus: high-potting power supply acts on any two phase insulations of three-phase electric power apparatus through two identical detection impedance parallel connections at noble potential place, and described two output signals that detect between two end points that impedances are connected with three-phase electric power apparatus are exactly the local discharge signal of these two phase insulations.
Detect between the impedances blocked impedance is arranged the high-pressure side of described high-potting power supply and described two.
The local discharge signal of exporting in the impedance is sent to the earth potential place by radio communication or optical-fibre communications surveying instrument is detected at described noble potential place.
The neutrodyne circuit of the pulse current method of measurement three-phase electric power apparatus local discharge of the present invention can improve anti-power supply interference capability, reduces the requirement to partial discharge test equipment, realizes the sensitiveer measurement of partial discharge under the field condition.
Description of drawings
Fig. 1: three capacitor models of power equipment shelf depreciation.11 and 12 are respectively the high voltage end and the earth terminal of tested power equipment; 13 is tested power equipment insulation; 14 is the local defect in the tested power equipment insulation; C
DThe electric capacity of local defect for this reason; C
AFor between high voltage end and the earth terminal with the defective capacitor C
DThe partition capacitance that is in series; C
EFor removing the C of series connection between high voltage end and the earth terminal
DAnd C
ABack rest parts electric capacity.
Fig. 2: the hookup that partial discharge pulse's current method is measured.Fig. 2-(a) is a parallel way, detects impedance Z
MBe connected coupling capacitance C
MEarth terminal; Fig. 2-(b) is a series system, detects impedance Z
MBe connected equipment under test C
XEarth terminal; Fig. 2-(c) is a balance mode, balancing capacitance C
X2With the equipment under test capacitor C
X1Same or similar, detect impedance Z
M1And Z
M2Identical.The undesired signal of high-voltage power supply is parallel by the equipment under test capacitor C
X1With the balance capacitor C
X2, make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2.The local discharge signal serial of equipment under test is by the equipment under test capacitor C
X1With the balance capacitor C
X2, make that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Can effectively detect the local discharge signal of equipment under test thus, suppress the undesired signal of power supply.
Fig. 3: measure three-phase electric power apparatus A phase and the B balance mode test circuit of the shelf depreciation of insulation relatively mutually.A is capacitor C relatively
XAWith B capacitor C relatively
XBBalancing capacitance detects impedance Z each other
M1And Z
M2Be installed in C
XBAnd C
XANoble potential.When there was undesired signal in high-voltage power supply, undesired signal was parallel by detecting impedance Z
M1And Z
M2, make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2; When equipment under test A relatively insulate or B when having shelf depreciation in relatively insulating, the local discharge signal serial is by detecting impedance Z
M1And Z
M2, make that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Can effectively detect the shelf depreciation that equipment under test A insulate mutually and insulate mutually with B thus, suppress the undesired signal of power supply.
Fig. 4: the balance mode test circuit of measuring the shelf depreciation of three-phase electric power apparatus AC phase insulation and BC phase insulation.The alternate capacitor C of AC
XCAAlternate capacitor C with BC
XBCBalancing capacitance detects impedance Z each other
M1And Z
M2Be installed in C
XBCAnd C
XCANoble potential.When there was undesired signal in high-voltage power supply, undesired signal was parallel by detecting impedance Z
M1And Z
M2, make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2; When having shelf depreciation in equipment under test AC phase insulation or the BC phase insulation, the local discharge signal serial is by detecting impedance Z
M1And Z
M2, make that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Can effectively detect the shelf depreciation of equipment under test AC phase insulation and BC phase insulation thus, suppress the undesired signal of power supply.
Fig. 5 a: embodiment of the neutrodyne circuit of the pulse current method of measurement three-phase electric power apparatus local discharge.Detect impedance based on transformer principle, 61 is the magnetic core of transformer; 62 is the I section of the former limit of transformer winding, as detecting impedance Z
M163 is the II section of the former limit of transformer winding, as detecting impedance Z
M264 is the secondary winding of transformer; 65 are high potential signal processing and transmitting element (powered battery); 66 are the noble potential shielding; 67 are reception of earth potential signal and processing unit; 68 for the high voltage isolation signals transmits, and optical fiber transmits or radio transmits.The port one of the former limit of transformer winding is connected to the high-voltage test power supply, and port 2 and port 3 are connected to two high-pressure sides mutually of tested power equipment respectively.When there was undesired signal in high-voltage power supply, undesired signal was entered by port one, the I section and the II section of the former limit of parallel passes transformer winding, reach port 2 and port 3, the flow direction that produces in magnetic core of transformer is opposite, and counteracting is zero, so transformer secondary winding 64 output signal not.When having shelf depreciation in the equipment under test, local discharge signal is process between port 2 and port 3, and serial is through the I section and the II section of the former limit of transformer winding, and the magnetic flux in the magnetic core of transformer is superimposed, so transformer secondary winding 64 output signals.The local discharge signal of transformer secondary winding output is handled by high potential signal and transmitting element 65 amplifies, filtering and sampling, changes radio signal into again or light signal sends.The earth potential signal receives and processing unit 67 receives 65 local discharge signals that send, and further handles, and finishes measurement of partial discharge.
Embodiment
Power equipment comprises A, B, C three-phase, and the shelf depreciation test need relatively be insulated and each phase insulation at each.The structure of power equipment three-phase is symmetry substantially, and relatively electric capacity is very approaching for each, and each alternate electric capacity is also very approaching.Therefore, when detecting one of them shelf depreciation that relatively insulate, can with another relatively electric capacity as balancing capacitance; When detecting the shelf depreciation of one of them phase insulation, can constitute the balance mode test circuit that partial discharge pulse's current method is measured thus with another alternate electric capacity as balancing capacitance.
When measuring the shelf depreciation that power equipment relatively insulate, carry out the test of two-phase insulation at every turn, two is symmetrical, and two relatively electric capacity is approaching, each other balancing capacitance.Shown in Figure 3 is the balance mode test circuit of measuring A phase and B insulated local discharge relatively mutually, wherein: U
SBe the high-voltage test power supply; Z
SBe blocked impedance; C
XA, C
XBAnd C
XCBe each electric capacity relatively of equipment under test; Z
M1And Z
M2For detecting impedance.When there was undesired signal in the high-voltage test power supply, this undesired signal was parallel by detecting impedance Z
M1And Z
M2, detecting impedance Z
M1And Z
M2Last generation waveform, the signal that amplitude is identical with polarity make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2.When equipment under test A mutually or B when having shelf depreciation mutually, the local discharge signal serial is by detecting impedance Z
M1And Z
M2, detecting impedance Z
M1And Z
M2Last generation shape but opposite polarity signal identical with amplitude makes that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Thus, between P1 and P2, can effectively obtain the local discharge signal that A in the tested power equipment insulate mutually and insulate mutually with B at 2, suppress undesired signal, realize that A mutually and the B measurement of partial discharge that relatively insulate mutually from power supply.Can measure the shelf depreciation of insulation relatively of C phase with quadrat method.
When measuring the shelf depreciation of power equipment phase insulation, carry out the test of two phase insulations, two alternate symmetries at every turn, two alternate electric capacity are approaching, balancing capacitance each other, shown in Figure 4 is the balance mode test circuit of measuring AC and BC phase insulation shelf depreciation, wherein: U
SBe the high-voltage test power supply; Z
SBe blocked impedance; C
XAB, C
XBCAnd C
XCABe each alternate electric capacity of equipment under test; Z
M1And Z
M2For detecting impedance.When there was undesired signal in the high-voltage test power supply, this undesired signal was parallel by detecting impedance Z
M1And Z
M2, detecting impedance Z
M1And Z
M2Last generation waveform, the signal that amplitude is identical with polarity make that output signal between P1 and the P2 is two to detect the reversed polarity stack of impedance signals, is close to zero at 2.Alternate or BC is alternate when having shelf depreciation as equipment under test AC, the local discharge signal serial is by detecting impedance Z
M1And Z
M2, detecting impedance Z
M1And Z
M2Last generation shape but opposite polarity signal identical with amplitude makes that output signal between P1 and the P2 is two to detect the same polarities stack of impedance signals at 2.Thus, between P1 and P2, can effectively obtain the local discharge signal of AC phase insulation and BC phase insulation in the tested power equipment at 2, suppress undesired signal, realize the measurement of partial discharge of the alternate and BC phase insulation of AC from power supply.Can measure the shelf depreciation of AB phase insulation with quadrat method.
In Fig. 3 and Fig. 4 circuit, detect impedance Z
M1And Z
M2Be installed in the high potential position of hookup, do not have the earth potential position that is installed in hookup like that shown in the image pattern 2.For most power equipment, can't separately obtain the earth terminal of each phase, therefore can't be in the installation and measuring impedance of the earth potential position of each phase.Because this restriction, so adopt in high potential position installation and measuring impedance.
Detect impedance Z
M1And Z
M2Be in high potential position, but scope need be in the earth potential position, the high voltage that needs between this to solve signal is isolated transmission.Can be at the noble potential place to local discharge signal amplify, processing such as filtering and sampling, be sent to earthy scope by radio or optical-fibre communications then, the signal processing circuit at noble potential place adopts powered battery.Sort signal transmits at present existing mature technology.
The invention is characterized in, the high-voltage test power supply acts in any two insulation relatively of three-phase electric power apparatus through two identical detection impedance parallel connections, or on any two phase insulations, two electric capacity or two alternate electric capacity balancing capacitances each other relatively, constitute the balance mode test circuit that partial discharge pulse's current method is measured, the Partial Discharge Detection impedance is installed in high potential position.The method can improve the antijamming capability of Partial Discharge Detection, reduces the requirement to the test condition of Partial Discharge Detection.
One embodiment of the present of invention as shown in Figure 5.Detect impedance based on transformer principle, wherein 61 is the magnetic core of transformer; 62 is the I section of the former limit of transformer winding, as detecting impedance Z
M163 is the II section of the former limit of transformer winding, as detecting impedance Z
M264 is the secondary winding of transformer; 65 are high potential signal processing and transmitting element; 66 are the noble potential shielding; 67 are reception of earth potential signal and processing unit; 68 for the high voltage isolation signals transmits, and optical fiber transmits or wireless transmission.
In the embodiment of Fig. 5, the port one of the former limit of transformer winding is connected to the high-voltage test power supply, and port 2 and port 3 are connected to two high-pressure sides mutually of tested power equipment respectively, as shown in Figure 3 and Figure 4.When there was undesired signal in high-voltage power supply, undesired signal was entered by port one, the I section and the II section of the former limit of parallel passes transformer winding, reach port 2 and port 3, the flow direction that produces in magnetic core of transformer is opposite, and counteracting is zero, so transformer secondary winding 64 output signal not.When having shelf depreciation in the equipment under test, local discharge signal is process between port 2 and port 3, and serial is through the I section and the II section of the former limit of transformer winding, and the magnetic flux in the magnetic core of transformer is superimposed, so transformer secondary winding 64 output signals.The local discharge signal of transformer secondary winding output is handled by high potential signal and transmitting element 65 amplifies, filtering and sampling, changes radio signal into again or light signal sends.The earth potential signal receives and processing unit 67 receives 65 local discharge signals that send, and further handles, and finishes measurement of partial discharge.The noble potential device adopts powered battery, adopts 66 shieldings anti-interference.
Claims (4)
1. measure the neutrodyne circuit of the pulse current method of three-phase electric power apparatus local discharge, it is characterized in that, be the neutrodyne circuit of the shelf depreciation of insulation relatively that is used to measure any two-phase of three-phase electric power apparatus: two identical detection impedance parallel connections at a high-potting power supply process noble potential place act on any two insulation relatively of three-phase electric power apparatus, and the output signal between two end points that described two detection impedances are connected with three-phase electric power apparatus is exactly these two local discharge signals of insulation relatively.
2. measure the neutrodyne circuit of the pulse current method of three-phase electric power apparatus local discharge, it is characterized in that, be the neutrodyne circuit that is used to measure the shelf depreciation of any two phase insulations of three-phase electric power apparatus: high-potting power supply acts on any two phase insulations of three-phase electric power apparatus through two identical detection impedance parallel connections at noble potential place, and described two output signals that detect between two end points that impedances are connected with three-phase electric power apparatus are exactly the local discharge signal of these two phase insulations.
3. according to the neutrodyne circuit of the pulse current method of any described measurement three-phase electric power apparatus local discharge of claim in claim 1 or the claim 2, it is characterized in that, detect between the impedances blocked impedance is arranged the high-pressure side of described high-potting power supply and described two.
4. according to the neutrodyne circuit of the pulse current method of any described measurement three-phase electric power apparatus local discharge of claim in claim 1 or the claim 2, it is characterized in that the local discharge signal of exporting in the impedance is sent to the earth potential place by radio communication or optical-fibre communications surveying instrument is detected at described noble potential place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102407784A CN101435850A (en) | 2008-12-25 | 2008-12-25 | Balance type circuit of pulse current method for measuring three-phase electric power apparatus local discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102407784A CN101435850A (en) | 2008-12-25 | 2008-12-25 | Balance type circuit of pulse current method for measuring three-phase electric power apparatus local discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101435850A true CN101435850A (en) | 2009-05-20 |
Family
ID=40710388
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102407784A Pending CN101435850A (en) | 2008-12-25 | 2008-12-25 | Balance type circuit of pulse current method for measuring three-phase electric power apparatus local discharge |
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|---|---|
| CN (1) | CN101435850A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702003B (en) * | 2009-09-10 | 2012-02-22 | 保定天威集团有限公司 | Detection circuit for partial discharge of capacitor |
| CN103630811A (en) * | 2013-11-29 | 2014-03-12 | 广州供电局有限公司 | Digital partial discharge detecting system |
| CN106353659A (en) * | 2016-11-30 | 2017-01-25 | 浙江舟山海洋输电研究院有限公司 | Dynamic balance anti-interference device of cable partial discharge and working method of dynamic balance anti-interference device |
| CN108051716A (en) * | 2018-02-01 | 2018-05-18 | 清华大学 | A kind of detection method for local discharge based on frequency dividing sampling |
| CN114200257A (en) * | 2021-11-19 | 2022-03-18 | 山东电工配网科技发展有限公司 | Online monitor is put in ring net case office |
-
2008
- 2008-12-25 CN CNA2008102407784A patent/CN101435850A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702003B (en) * | 2009-09-10 | 2012-02-22 | 保定天威集团有限公司 | Detection circuit for partial discharge of capacitor |
| CN103630811A (en) * | 2013-11-29 | 2014-03-12 | 广州供电局有限公司 | Digital partial discharge detecting system |
| CN106353659A (en) * | 2016-11-30 | 2017-01-25 | 浙江舟山海洋输电研究院有限公司 | Dynamic balance anti-interference device of cable partial discharge and working method of dynamic balance anti-interference device |
| CN108051716A (en) * | 2018-02-01 | 2018-05-18 | 清华大学 | A kind of detection method for local discharge based on frequency dividing sampling |
| CN114200257A (en) * | 2021-11-19 | 2022-03-18 | 山东电工配网科技发展有限公司 | Online monitor is put in ring net case office |
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