CN106771922B - A kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge - Google Patents
A kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge Download PDFInfo
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- CN106771922B CN106771922B CN201611235481.XA CN201611235481A CN106771922B CN 106771922 B CN106771922 B CN 106771922B CN 201611235481 A CN201611235481 A CN 201611235481A CN 106771922 B CN106771922 B CN 106771922B
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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
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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
Abstract
The present invention provides a kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge, and partial discharge detecting system structure is that every HFCT is mounted on a high-tension cable ground line, transient state radio wave sensor TEV be mounted on switchgear outer wall；Three HFCT pass through a BNC coaxial cable respectively and are sequentially connected a high-pass filter, a wideband gain amplifier, and are connected to first three channel of data acquisition unit；One TEV is directly connected to the fourth lane of data acquisition unit by another BNC coaxial cable；Phase signal acquiring unit is mounted on high-tension cable, and the external trigger interface of low-pass filter and data acquisition unit is even successively connect by another BNC coaxial cable.Recognition of Partial Discharge includes the recognition methods of the local discharge signal of the recognition methods and the 4th channel to the local discharge signal in first three channel.The present invention, which realizes, judges the synchronous of multi-source head shelf depreciation, improves the accuracy of identification.
Description
Technical field
The present invention relates to a kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge, belong to electricity
Power apparatus local discharge detection technique field.
Background technique
Compared with traditional overhead line, power cable power supply have be not affected by the external environment, save the area, electric property
The advantages that good.With the development of urban distribution network, the utilization rate of power cable is continuously improved, and cable reliability of operation is by electricity
The concern of power department.High-tension cable is due to its intrinsic mounting complexity and long-term high current continuous operation, along with external force is broken
The influence of the composite factors such as bad, water tree invasion, equipment deficiency, equipment deficiency, construction technology, be easy to cause cable operation fault.
Partial Discharge Detection is to improve the powerful measure of medium and high voltage cable and other mesohigh power equipment operational reliabilitys.But at present
Power equipment partial discharge detecting system, by the restriction of two key factors, first, live noise and interference signal are non-
Chang Qianglie mixes with local discharge signal, and it is difficult to automatically extract；Second, shelf depreciation may be from cable body,
The equipment that tag, cable intermediate joint, cable ends connect, the differentiation difficulty of multi-source head shelf depreciation are larger.
Summary of the invention
In order to solve the above-mentioned technical problem, the reliability and judgment accuracy of power equipment Partial Discharge Detection are promoted, this
Invention proposes a kind of high-tension electricity system of detecting partial discharge in equipment Recognition of Partial Discharge.
The technical solution adopted by the present invention is as follows:
High-tension electricity system of detecting partial discharge in equipment includes a set of complete sensing and signal acquiring system and one
Cover novel Recognition of Partial Discharge.
A kind of high-tension electricity system of detecting partial discharge in equipment, including three HF current transformers, transient state it is electric
Wave sensor TEV, a phase signal acquiring unit, three high-pass filters, a low-pass filter, three wideband gains are put
Big device, data acquisition unit, it is characterised in that: every HFCT is mounted on a high-tension cable ground line, transient state electric wave pass
Sensor TEV is mounted on switchgear outer wall；Three HFCT pass through a BNC coaxial cable respectively and are sequentially connected a high-pass filtering
Device, a wideband gain amplifier, and it is connected to first three channel of data acquisition unit；One TEV is same by another BNC
Shaft cable is directly connected to the fourth lane of data acquisition unit；Phase signal acquiring unit is mounted on high-tension cable, and is led to
Cross the external trigger interface that another BNC coaxial cable even successively connects low-pass filter and data acquisition unit.
The data acquisition unit is the HDO4000 series, HDO6000 series or HDO8000 series of LeCroy company
12 high speed digital oscilloscopes.
The high-pass filter is the high-pass filter of 50Hz.
The Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, including the part to first three channel
The identification of the local discharge signal of the identification and the 4th channel of discharge signal, which is characterized in that the part in first three channel
The recognition methods of discharge signal sequentially includes the following steps:
Step 1, burst signal extracts: carrying out raw data acquisition by three HFCT respectively, initial data is
The signal that HFCT (22) is coupled to, using 125MS/s as sample rate, 20ms be sampling time length, external trigger is data acquisition
Trigger source, phase signal acquiring unit obtain 50Hz sinusoidal signal be trigger signal, 10 first three channels of repeated acquisition
Initial data；White noise acoustic evaluation is carried out to the initial data in first three channel, instantaneous arteries and veins is set automatically by white-noise level
The extraction threshold value of signal is rushed, the burst signal for being lower than the threshold value is retained；
Boundary conditions for divided regions is sought: according to type of cable and characteristic parameter, when characteristic parameter is rise time, decline
Between, pulse width, equivalent bandwidth and equivalent time length, the transmission function f (L) that construction local discharge signal is propagated in the cable
=A0Exp (- α L), wherein L is the distance propagated, and α is the attenuation coefficient obtained by the test experiments to cable, A0For distance
The measured value of characteristic parameter when being 0, f (L) are the value of the characteristic parameter after propagation distance L, and according to cable length and electricity
The location parameter of cable transition joint solves in tag, transition joint, cable body and cable ends connection equipment
The up-and-down boundary condition of the characteristic parameter of local discharge signal；
Step 3, subregion determines local discharge signal position, and the level of 4 different phases is divided to judge:
1st stage judgement, judges whether there is the local discharge signal from tag, by comparing instantaneous arteries and veins
The characteristic parameter of signal is rushed whether within the up-and-down boundary of tag shelf depreciation, if nothing, is carried out next
The judgement in stage；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, drafting office
Portion's discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing,
If so, being then judged as the local discharge signal of tag, discharge capacity is calculated, and result is write in database；
2nd stage judgement, judges whether there is the local discharge signal from cable intermediate joint, by comparing instantaneous arteries and veins
Rush signal characteristic parameter whether in the cable between connector shelf depreciation up-and-down boundary within, if nothing, carry out next
The judgement in stage；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, drafting office
Portion's discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing,
If so, being then judged as the local discharge signal of cable intermediate joint, discharge capacity is calculated, and result is write in database；
3rd stage judgement, judges whether there is the local discharge signal from cable body, believes by comparing transient pulse
Number characteristic parameter whether within the up-and-down boundary of cable body shelf depreciation, if nothing, carry out sentencing for next stage
It is disconnected；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, draws shelf depreciation phase
Bitmap spectrum, judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；If so, then
It is judged as the local discharge signal of cable body, calculates discharge capacity, and result is write in database；
4th stage judgement judges whether there is the local discharge signal in cable ends connection equipment, by comparing
The characteristic parameter of burst signal, if nothing, carries out next rank whether except the up-and-down boundary of cable local discharge
The judgement of section；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, draws part
Discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；Such as
Fruit has, then is judged as the local discharge signal of cable ends connection equipment, calculates discharge capacity, and result is write in database.
The Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, including the part to first three channel
The identification of the local discharge signal of the identification and the 4th channel of discharge signal；Knowledge to the local discharge signal in the 4th channel
Other method, which is sequentially included the following steps:, carries out raw data acquisition by TEV, and initial data is the signal that TEV is coupled to, with
125MS/s is sample rate, 20ms is sampling time length, external trigger is data acquisition trigger source, 10 repeated acquisitions open
Close the initial data of cabinet；The extraction threshold value of burst signal is set automatically by white-noise level, retains and is lower than the threshold
The burst signal of value；By the extraction result superposition of 10 initial data, shelf depreciation phase map is drawn, judges whether have
There is apparent phase TuPu method, if nothing, terminate whole identification process, if so, being then judged as the part in switchgear
Discharge signal calculates discharge capacity, and result is write in database.
The present invention judges whether have the method for apparent phase TuPu method using the prior art, specifically describes in document
" based on application of the automatic spectrum recognition of K-Means clustering algorithm in cable local discharge on-line monitoring system ", Zuo Zhejing
Small flat, Peng little Sheng et al., " high-voltage technology ", in September, 2012 the 9th phase of volume 38, page 2437 page -2446.
Compared with prior art, the beneficial effect that the present invention reaches is:
The present invention can be identified by a set of complete sensing and signal acquiring system and a set of novel shelf depreciation
The accuracy of sensitivity and the identification of power equipment Partial Discharge Detection can be greatly improved in method, specific as follows:
(1) pass through the signal detection of first three multi-channel high frequency current transformer HFCT, it can efficient coupling high-tension cable ground connection
Local discharge signal on line, the 50Hz sinusoidal signal obtained by phase signal acquiring unit stablize trigger signal acquisition, and
It is superimposed by 10 acquisitions, obtains more clear shelf depreciation phase map.By 50Hz high-pass filter, it is dry to filter power frequency
Signal is disturbed, the amplification to faint local discharge signal is realized by wideband gain amplifier.Pass through 12 high speed digital oscilloscopes
Data acquisition, realize to the efficiently sampling of original signal.All these hardware combinations, ensure that high speed, high-precision, it is highly sensitive
The acquisition of degree, high duplication shelf depreciation initial data.
(2) according to according to type of cable and characteristic parameter, the transmitting letter that local discharge signal is propagated in the cable is constructed
Number, and according to parameters such as cable length, cable intermediate joint positions, solve tag, transition joint, cable body with
And cable ends connect the up-and-down boundary condition of the characteristic parameter of local discharge signal in equipment, these boundary conditions are sought,
It will inhibit to provide good precondition for interference signal.
(3) according to local discharge signal boundary conditions for divided regions, it is divided into 4 different phases and judges tag, centre
Whether there is local discharge signal in connector, cable body and cable ends connection equipment, will realize to multi-source head shelf depreciation
Synchronous judgement, improve the accuracy of identification.
Detailed description of the invention
Fig. 1 is hardware system schematic diagram and sensor scheme of installation of the invention；
Fig. 2 is shelf depreciation identification process of the present invention to first three channel；
Fig. 3 is shelf depreciation identification process of the present invention to the 4th channel.
Specific embodiment
With reference to the accompanying drawing, the present invention is further elaborated, following instance cannot be used to limit for illustrating the present invention
The scope of the present invention processed.
High-tension electricity system of detecting partial discharge in equipment includes a set of complete sensing and signal acquiring system and one
Cover novel Recognition of Partial Discharge.
As shown in Figure 1, a kind of high-tension electricity system of detecting partial discharge in equipment, including three HF current transformers 22,
One transient state ground radio wave sensor TEV21, a phase signal acquiring unit, three 50Hz high-pass filters, 25, low passes
Filter 24, three wideband gain amplifiers 26, data acquisition units 11, it is characterised in that: every HFCT22 is mounted on one
High-tension cable ground line 33 on, transient state radio wave sensor TEV21 be mounted on 12 outer wall of switchgear；Three HFCT22 lead to respectively
It crosses a BNC coaxial cable 31 and is sequentially connected 25, wideband gain amplifiers 26 of a 50Hz high-pass filter, and be connected to
First three channel of data acquisition unit 11；One TEV21 is directly connected to data acquisition by another BNC coaxial cable 31
The fourth lane of unit 11；Phase signal acquiring unit 23 is mounted on high-tension cable 32, and passes through another BNC coaxial cable
31 even successively connect the external trigger interface of low-pass filter 24 and data acquisition unit 11.The data acquisition unit is
12 high speed digital oscilloscopes of the HDO4000 series of LeCroy company.The HDO6000 system of LeCroy company can certainly be used
12 high speed digital oscilloscopes of column or HDO8000 series.
The Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, including the part to first three channel
The identification of the local discharge signal of the identification and the 4th channel of discharge signal, as shown in Fig. 2, the part to first three channel is put
The recognition methods of electric signal sequentially includes the following steps:
Step 1, burst signal extracts: carrying out raw data acquisition initial data by three HFCT22 respectively is
The signal that HFCT (22) is coupled to, using 125MS/s as sample rate, 20ms be sampling time length, external trigger is data acquisition
Trigger source, phase signal acquiring unit obtain 50Hz sinusoidal signal be trigger signal, 10 first three channels of repeated acquisition
Initial data；White noise acoustic evaluation is carried out to the initial data in first three channel, instantaneous arteries and veins is set automatically by white-noise level
The extraction threshold value of signal is rushed, the burst signal for being lower than the threshold value is retained；
Step 2, boundary conditions for divided regions is sought: according to type of cable and characteristic parameter, characteristic parameter be the rise time, under
Time, pulse width, equivalent bandwidth and equivalent time length, the transmission function that construction local discharge signal is propagated in the cable drop
F (L)=A0Exp (- α L), wherein L is the distance propagated, and α is the attenuation coefficient obtained by the test experiments to cable, A0For
The measured value of characteristic parameter when distance is 0, f (L) are the value of the characteristic parameter after propagation distance L, and according to cable length
With the location parameter of cable intermediate joint, solves tag, transition joint, cable body and cable ends connection and set
The up-and-down boundary condition of the characteristic parameter of standby middle local discharge signal；
Step 3, subregion determines local discharge signal position, and the level of 4 different phases is divided to judge:
1st stage judgement, judges whether there is the local discharge signal from tag, by comparing instantaneous arteries and veins
The characteristic parameter of signal is rushed whether within the up-and-down boundary of tag shelf depreciation, if nothing, is carried out next
The judgement in stage；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, drafting office
Portion's discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing,
If so, being then judged as the local discharge signal of tag, discharge capacity is calculated, and result is write in database；
2nd stage judgement, judges whether there is the local discharge signal from cable intermediate joint, by comparing instantaneous arteries and veins
Rush signal characteristic parameter whether in the cable between connector shelf depreciation up-and-down boundary within, if nothing, carry out next
The judgement in stage；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, drafting office
Portion's discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing,
If so, being then judged as the local discharge signal of cable intermediate joint, discharge capacity is calculated, and result is write in database；
3rd stage judgement, judges whether there is the local discharge signal from cable body, believes by comparing transient pulse
Number characteristic parameter whether within the up-and-down boundary of cable body shelf depreciation, if nothing, carry out sentencing for next stage
It is disconnected；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, draws shelf depreciation phase
Bitmap spectrum, judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；If so, then
It is judged as the local discharge signal of cable body, calculates discharge capacity, and result is write in database；
4th stage judgement judges whether there is the local discharge signal in cable ends connection equipment, by comparing
The characteristic parameter of burst signal, if nothing, carries out next rank whether except the up-and-down boundary of cable local discharge
The judgement of section；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, draws part
Discharge phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；Such as
Fruit has, then is judged as the local discharge signal of cable ends connection equipment, calculates discharge capacity, and result is write in database.
The Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, including the part to first three channel
The identification of the local discharge signal of the identification and the 4th channel of discharge signal.As shown in figure 3, being put to the part in the 4th channel
The recognition methods of electric signal, which is sequentially included the following steps:, carries out raw data acquisition by TEV, and initial data is what TEV was coupled to
Signal, using 125MS/s as sample rate, 20ms be sampling time length, external trigger is the trigger source of data acquisition, 10 repetitions
Acquire the initial data of switchgear；The extraction threshold value of burst signal is set automatically by white-noise level, and reservation is lower than
The burst signal of the threshold value；By the extraction result superposition of 10 initial data, shelf depreciation phase map, judgement are drawn
Whether there is apparent phase TuPu method to terminate whole identification process if nothing, if so, being then judged as in switchgear
Local discharge signal, calculate discharge capacity, and result write in database.
The present invention judges whether have the method for apparent phase TuPu method using the prior art, specifically describes in document
" based on application of the automatic spectrum recognition of K-Means clustering algorithm in cable local discharge on-line monitoring system ", Zuo Zhejing
Small flat, Peng little Sheng et al., " high-voltage technology ", in September, 2012 the 9th phase of volume 38, page 2437 page -2446.
Claims (2)
1. a kind of Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, the high-tension electricity equipment part
Discharging detecting system includes three HF current transformers (22), transient state ground radio wave sensor TEV (21), a phase letter
Number acquiring unit (23), three high-pass filters (25), a low-pass filter (24), three wideband gain amplifiers (26),
Data acquisition unit (11), every HFCT (22) are mounted on high-tension cable ground line (33), transient state ground radio wave sensor
TEV (21) is mounted on switchgear (12) outer wall；Three HFCT (22) are sequentially connected by a BNC coaxial cable (31) respectively
One high-pass filter (25), a wideband gain amplifier (26), and be connected to data acquisition unit (11) first three is logical
Road；One TEV (21) is directly connected to the fourth lane of data acquisition unit (11) by another BNC coaxial cable (31)；
Phase signal acquiring unit (23) is mounted on high-tension cable (32), and is sequentially connected by another BNC coaxial cable (31)
The external trigger interface of low-pass filter (24) and data acquisition unit (11)；Including the local discharge signal to first three channel
Identification and the 4th channel local discharge signal identification, which is characterized in that the local discharge signal in first three channel
Recognition methods sequentially include the following steps:
Step 1, burst signal extracts: carrying out raw data acquisition by three HFCT (22) respectively, initial data is
The signal that HFCT (22) is coupled to, using 125MS/s as sample rate, 20ms be sampling time length, external trigger is data acquisition
Trigger source, phase signal acquiring unit obtain 50Hz sinusoidal signal be trigger signal, 10 first three channels of repeated acquisition
Initial data；White noise acoustic evaluation is carried out to the initial data in first three channel, instantaneous arteries and veins is set automatically by white-noise level
The extraction threshold value of signal is rushed, the burst signal for being lower than threshold value is retained；
Step 2, boundary conditions for divided regions is sought: according to type of cable and characteristic parameter, when characteristic parameter is rise time, decline
Between, pulse width, equivalent bandwidth and equivalent time length, the transmission function f (L) that construction local discharge signal is propagated in the cable
=A0Exp (- α L), wherein L is the distance propagated, and α is the attenuation coefficient obtained by the test experiments to cable, A0For distance
The measured value of characteristic parameter when being 0, f (L) are the value of the characteristic parameter after propagation distance L, and according to cable length and electricity
The location parameter of cable transition joint solves in tag, transition joint, cable body and cable ends connection equipment
The up-and-down boundary condition of the characteristic parameter of local discharge signal；
Step 3, subregion determines local discharge signal position, and the level of 4 different phases is divided to judge:
1st stage judgement, judges whether there is the local discharge signal from tag, believes by comparing transient pulse
Number characteristic parameter whether within the up-and-down boundary of tag shelf depreciation, if nothing, carry out next stage
Judgement；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, part is drawn and puts
Electric phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing, if
Have, be then judged as the local discharge signal of tag, calculates discharge capacity, and result is write in database；
2nd stage judgement, judges whether there is the local discharge signal from cable intermediate joint, believes by comparing transient pulse
Number characteristic parameter whether in the cable between connector shelf depreciation up-and-down boundary within, if nothing, carry out next stage
Judgement；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, part is drawn and puts
Electric phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing, if
Have, be then judged as the local discharge signal of cable intermediate joint, calculates discharge capacity, and result is write in database；
3rd stage judgement, judges whether there is the local discharge signal from cable body, by comparing burst signal
Characteristic parameter, if nothing, carries out the judgement in next stage whether within the up-and-down boundary of cable body shelf depreciation；Such as
Fruit has, then retains these burst signals, and the extraction result of 10 initial data is superimposed, and draws shelf depreciation phase diagram
Spectrum, judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；If so, then judging
For the local discharge signal of cable body, discharge capacity is calculated, and result is write in database；
4th stage judgement judges whether there is the local discharge signal in cable ends connection equipment, by comparing instantaneous
The characteristic parameter of pulse signal, if nothing, carries out next stage whether except the up-and-down boundary of cable local discharge
Judgement；If so, then retaining these burst signals, the extraction result of 10 initial data is superimposed, draws shelf depreciation
Phase map judges whether that there is apparent phase TuPu method to carry out the judgement in next stage if nothing；If so,
Then it is judged as the local discharge signal of cable ends connection equipment, calculates discharge capacity, and result is write in database.
2. according to the Recognition of Partial Discharge of high-tension electricity system of detecting partial discharge in equipment, which is characterized in that the 4th
The recognition methods of the local discharge signal in channel, which is sequentially included the following steps:, carries out raw data acquisition, original number by TEV (21)
According to the signal being coupled to for TEV, using 125MS/s as sample rate, 20ms be sampling time length, external trigger is what data acquired
The initial data of trigger source, 10 repeated acquisition switchgears；The extraction of burst signal is set automatically by white-noise level
Threshold value retains the burst signal for being lower than the threshold value；By the extraction result superposition of 10 initial data, draws part and put
Electric phase map judges whether have apparent phase TuPu method, if nothing, terminate whole identification process, if so, then
The local discharge signal being judged as in switchgear calculates discharge capacity, and result is write in database.
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| CN103969562A (en) * | 2014-05-29 | 2014-08-06 | 广州供电局有限公司 | Simulated partial discharge detection device for switch cabinet |
| CN104865511A (en) * | 2015-06-23 | 2015-08-26 | 国家电网公司 | Partial discharge detection device |
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