CN109444693A - A kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure - Google Patents
A kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure Download PDFInfo
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- CN109444693A CN109444693A CN201811444771.4A CN201811444771A CN109444693A CN 109444693 A CN109444693 A CN 109444693A CN 201811444771 A CN201811444771 A CN 201811444771A CN 109444693 A CN109444693 A CN 109444693A
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- 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
- G01R31/1209—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 using acoustic 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
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- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure that the present invention provides a kind of, it first passes through TEV detection mode and normal cycle inspection is carried out to switchgear, when judging testing result exception, switchgear is carried out using TEV detection mode combining ultrasonic wave detection mode to detect again, if being confirmed as abnormality, interruption maintenance just is carried out to respective switch cabinet.The present invention can carry out the partial discharge inspection of 35kV switchgear by the detection mode that do not have a power failure, and detection mode safety is detected, testing result is reliable using TEV detection mode combining ultrasonic wave detection mode.
Description
Technical field
The invention belongs to power grid detection technique field, in particular to a kind of 35kV switch cabinet partial discharge based on the detection that do not have a power failure
Detection method.
Background technique
Currently, as technology continues to advance, obtaining promoting based on detection techniques that do not have a power failure such as live detection, on-line monitorings and answer
With.With the continuous promotion of this technology, tradition needs the project of the customary detection of switchgear power failure progress, most of to need to stop
Electrometric main state variables can be obtained at present by live state detection mode.Skill is detected using live state
Art, is better able to obtain the nearest quantity of state of equipment, carries out dynamic evaluation to equipment state according to these real-time data, realizes
Equipment state grasped in real time.In addition relative to interruption maintenance, repair based on condition of component can effectively reduce line outage number, reduce
The operation risk of electric system has good economic results in society.Using not having a power failure, detection mode can be found in advance
The latency defect of switchgear, significantly reduces switchgear failure rate, reduces the generation of power outage.Do not have a power failure detection
Repair based on condition of component can effectively find latency defect, improve power grid power supply reliability, checking experiment personnel in test operation more
Add safety, the development trend for adapting to the following service technique will be more capable of in this operation mode.
Summary of the invention
The present invention provides a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure, and can pass through the inspection that do not have a power failure
Survey mode carries out the partial discharge inspection of 35kV switchgear, detection mode safety, using TEV detection mode combining ultrasonic wave detection mode
It is detected, testing result is reliable.
The present invention is specially a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure, the 35kV switchgear
Partial discharge detection method specifically comprises the following steps:
Step (1), power grid transport inspection department door determine the 35kV partial discharge of switchgear patrol and detection period；
The 35kV partial discharge of switchgear patrol and detection period system that step (2), professional room are determined according to power grid transport inspection department door
Determine 35kV partial discharge of switchgear year patrol and detection plan；
Step (3), corresponding teams and groups carry out 35kV switchgear office using TEV detection mode according to patrol and detection period and plan
Discharge patrol and detection in portion；
Step (4), teams and groups record patrol and detection result, are managed to detection data, and work out examining report,
Professional room reports to transport inspection department door after auditing to examining report；
Step (5), teams and groups carry out state according to testing result and tentatively judge that if normal condition, then teams and groups are according to setting
Normal polling period wait inspection next time；If abnormality, then it will test result and abnormal state information be sent to specially
Industry room enters step (6)；
The testing result that step (6), professional room are sent according to teams and groups, carries out state judgement to it again, if normal shape
State then notifies teams and groups to wait inspection next time according to the normal polling period of setting；Decline state if abnormal possibility, then reports
Transport inspection department door is sent, (7) are entered step；If suspicious state or precarious position, then (8) are entered step；
Step (7), transport inspection department door shorten the 35kV partial discharge of switchgear patrol and detection period, return step (2)；
Step (8), teams and groups carry out 35kV switchgear using TEV detection mode combining ultrasonic wave detection mode again and locally put
Electric patrol and detection, and patrol and detection result is recorded；
Step (9), teams and groups are according at the beginning of the patrol and detection result carry out state of TEV detection mode combining ultrasonic wave detection mode
Step judgement, if normal condition, then return step (7)；If abnormality, then (10) are entered step；
Step (10), teams and groups carry out state judgement to testing result again, decline state if abnormal possibility, then return
Step (8)；If precarious position, then (11) are entered step；
Step (11) carries out interruption maintenance to respective switch cabinet, and uses the detection side TEV to the switchgear after the completion of maintenance
Formula carries out Partial Discharge Detection again, after detecting state is normal, carries out testing result record, carries out pipe to detection data
Reason, and examining report is worked out, professional room reports to transport inspection department door after auditing to examining report.
Further, the TEV detection mode, that is, transient state voltage-to-ground detection, using coupled capacitor sensor to transient state pair
Ground voltage is detected.
Further, the Measurement bandwidth of the coupled capacitor sensor is 3MHz~60MHz；Linear module is dB/mV,
1dB/mV=20log (V), wherein V is the transient state voltage-to-ground amplitude measured；When the partial discharge of the inside switch cabinet measured is believed
Number amplitude is greater than 20dB/mV, and the probability for destructive malfunction occur is 75%, when being greater than 30dB/mV, the general of destructive malfunction occurs
Rate is 90%.
Further, the TEV detection carries out the Primary Location of partial discharge point using amplitude positioning method, gets over close to discharge source
Close position Partial discharge signal amplitude is bigger, and being played a game by the Partial discharge signal amplitude difference between switchgear, it is simple preliminary fixed to put a progress
Position.
Further, the TEV detection carries out the accurate positioning of partial discharge point using positioning using TDOA mode, is coupled using two
Capacitance sensor is individually placed to the different position in switchgear surface, and then judges the position of discharge source；If first coupled capacitor
The Partial discharge signal amplitude that second coupled capacitor sensor of Partial discharge signal Amplitude Ration that sensor detects detects is big, then judges
Shelf depreciation is located proximate to first coupled capacitor sensor；If the Partial discharge signal that second coupled capacitor sensor detects
The Partial discharge signal amplitude that first coupled capacitor sensor of Amplitude Ration detects is big, then judge shelf depreciation is located proximate to second
A coupled capacitor sensor；Position by changing coupled capacitor sensor can be accurately positioned out the position of partial discharge point.
Further, the TEV detection carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using multiple couplings
Capacitance sensor is individually placed to the different position in switchgear surface, and then judges the position of discharge source；The Partial discharge signal detected
Position of the coupled capacitor sensor of amplitude maximum from partial discharge point is nearest；Position by changing coupled capacitor sensor being capable of essence
Determine that position goes out the position of partial discharge point.
Further, the ultrasound examination mode uses acoustic pressure formula ultrasonic sensor or piezoelectric-type ultrasonic wave sensor
Reach the measurement purpose to inside switch cabinet Partial discharge signal by the ultrasonic signal within the scope of measurement 20kHz~50kHz.
Further, the Measurement bandwidth of the ultrasonic sensor is 20kHz~50kHz；Linear module is dB/ μ V,
1dB/ μ V=20log (V), wherein V is voltage signal magnitude corresponding to the ultrasonic signal that measures of ultrasonic sensor；When
When the measured ultrasonic signal as caused by partial discharge is greater than 6dB/ μ V, hiss is heard by earphone, shows the switch
There are apparent partial discharge phenomenons for cabinet.
Further, the ultrasound examination carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using two
Ultrasonic sensor is individually placed to the different position in switchgear surface, and then judges the position of discharge source；If first ultrasonic wave
The Partial discharge signal amplitude that second ultrasonic sensor of Partial discharge signal Amplitude Ration that sensor detects detects is big, then judgement office
Portion's electric discharge is located proximate to first ultrasonic sensor；If the Partial discharge signal Amplitude Ration that second ultrasonic sensor detects
The Partial discharge signal amplitude that first ultrasonic sensor detects is big, then judge shelf depreciation is located proximate to second ultrasonic wave
Sensor；Position by changing ultrasonic sensor can be accurately positioned out the position of partial discharge point.
Further, the ultrasound examination carries out the accurate positioning of partial discharge point using positioning using TDOA mode, and use is multiple
Ultrasonic sensor is individually placed to the different position in switchgear surface, and then judges the position of discharge source；The partial discharge letter detected
Position of the ultrasonic sensor from partial discharge point of number amplitude maximum is nearest；Position by changing ultrasonic sensor can be accurate
Orient the position of partial discharge point.
Specific embodiment
Below to a kind of specific embodiment of the 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure of the present invention
It elaborates.
35kV switch cabinet partial discharge detection method of the present invention specifically comprises the following steps:
Step (1), power grid transport inspection department door determine the 35kV partial discharge of switchgear patrol and detection period；
The 35kV partial discharge of switchgear patrol and detection period system that step (2), professional room are determined according to power grid transport inspection department door
Determine 35kV partial discharge of switchgear year patrol and detection plan；
Step (3), corresponding teams and groups carry out 35kV switchgear office using TEV detection mode according to patrol and detection period and plan
Discharge patrol and detection in portion；
Step (4), teams and groups record patrol and detection result, are managed to detection data, and work out examining report,
Professional room reports to transport inspection department door after auditing to examining report；
Step (5), teams and groups carry out state according to testing result and tentatively judge that if normal condition, then teams and groups are according to setting
Normal polling period wait inspection next time；If abnormality, then it will test result and abnormal state information be sent to specially
Industry room enters step (6)；
The testing result that step (6), professional room are sent according to teams and groups, carries out state judgement to it again, if normal shape
State then notifies teams and groups to wait inspection next time according to the normal polling period of setting；Decline state if abnormal possibility, then reports
Transport inspection department door is sent, (7) are entered step；If suspicious state or precarious position, then (8) are entered step；
Step (7), transport inspection department door shorten the 35kV partial discharge of switchgear patrol and detection period, return step (2)；
Step (8), teams and groups carry out 35kV switchgear using TEV detection mode combining ultrasonic wave detection mode again and locally put
Electric patrol and detection, and patrol and detection result is recorded；
Step (9), teams and groups are according at the beginning of the patrol and detection result carry out state of TEV detection mode combining ultrasonic wave detection mode
Step judgement, if normal condition, then return step (7)；If abnormality, then (10) are entered step；
Step (10), teams and groups carry out state judgement to testing result again, decline state if abnormal possibility, then return
Step (8)；If precarious position, then (11) are entered step；
Step (11) carries out interruption maintenance to respective switch cabinet, and uses the detection side TEV to the switchgear after the completion of maintenance
Formula carries out Partial Discharge Detection again, after detecting state is normal, carries out testing result record, carries out pipe to detection data
Reason, and examining report is worked out, professional room reports to transport inspection department door after auditing to examining report.
The TEV detection mode, that is, transient state voltage-to-ground detection, when shelf depreciation occurs, point of discharge generates high-frequency current
Wave, and propagated to both direction.It being influenced by kelvin effect, current wave is focusing only on the propagation of metal cabinet inner surface, without
It is directed through.Junction is disconnected or insulate in metal, current wave is transferred to outer surface, and empty with electromagnetic wave freedom of entry
Between；Electromagnetic wave rising edge encounters outer metallic surface, generates transient state voltage-to-ground (Transient Earth Voltage).TEV's
Measurement is measured by coupled capacitor sensor.The Measurement bandwidth of the coupled capacitor sensor is 3MHz~60MHz；Degree
Amount unit is dB/mV, 1dB/mV=20log (V), and wherein V is the transient state voltage-to-ground amplitude measured；When the switch measured
Partial discharge signal amplitude inside cabinet is greater than 20dB/mV, and the probability for destructive malfunction occur is 75%, when being greater than 30dB/mV, occurs
The probability of destructive malfunction is 90%.The TEV detection carries out the Primary Location of partial discharge point using amplitude positioning method, close to put
The closer position Partial discharge signal amplitude of power supply is bigger, and being played a game by the Partial discharge signal amplitude difference between switchgear, it is simple to put a progress
Primary Location.The TEV detection carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using two or more coupling electricity
Hold sensor and be individually placed to the different position in switchgear surface, and then judges the position of discharge source；The Partial discharge signal width detected
It is nearest to be worth position of the maximum coupled capacitor sensor from partial discharge point；Position by changing coupled capacitor sensor can be accurate
Orient the position of partial discharge point.
The pressure wave propagated in the medium (gas, liquid, solid) is known as sound wave, higher than human ear audible frequency sound wave
Ultrasonic wave.The ultrasound examination of inside switch cabinet shelf depreciation is by the ultrasonic wave letter within the scope of measurement 20k Hz~50k Hz
Number reach the measurement purpose to Partial discharge signal.There are two types of the sensors of ultrasound examination: sound press type sensor, piezoelectric type sensing
Device.The Measurement bandwidth of the ultrasonic sensor is 20kHz~50kHz；Linear module is dB/ μ V, 1dB/ μ V=20log (V),
Voltage signal magnitude corresponding to the ultrasonic signal that wherein V measures for ultrasonic sensor；When measured by partial discharge
When caused ultrasonic signal is greater than 6dB/ μ V, hiss is heard by earphone, showing the switchgear, there are apparent partial discharges
Phenomenon.The ultrasound examination carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using two or more ultrasonic waves
Sensor is individually placed to the different position in switchgear surface, and then judges the position of discharge source；The Partial discharge signal amplitude detected
Position of the maximum ultrasonic sensor from partial discharge point is nearest；Position by changing ultrasonic sensor can be accurately positioned out
The position of partial discharge point.
Finally it should be noted that only illustrating technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair a specific embodiment of the invention
Change or equivalent replacement, but these modifications or change are being applied among pending claims.
Claims (10)
1. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure, which is characterized in that 35kV switchgear office
Detection method is put to specifically comprise the following steps:
Step (1), power grid transport inspection department door determine the 35kV partial discharge of switchgear patrol and detection period；
Step (2), professional room are formulated according to the 35kV partial discharge of switchgear patrol and detection period that power grid transport inspection department door determines
35kV partial discharge of switchgear year patrol and detection plan；
Step (3), corresponding teams and groups carry out 35kV switchgear using TEV detection mode according to patrol and detection period and plan and locally put
Electric patrol and detection；
Step (4), teams and groups record patrol and detection result, are managed to detection data, and work out examining report, profession
Room reports to transport inspection department door after auditing to examining report；
Step (5), teams and groups carry out state according to testing result and tentatively judge, if normal condition, then teams and groups according to setting just
Normal polling period waits inspection next time；If abnormality, then it will test result and abnormal state information be sent to professional room,
Enter step (6)；
The testing result that step (6), professional room are sent according to teams and groups, carries out state judgement to it again, if normal condition, then
Teams and groups are notified to wait inspection next time according to the normal polling period of setting；Decline state if abnormal possibility, then reports and submits fortune
Inspection department enters step (7)；If suspicious state or precarious position, then (8) are entered step；
Step (7), transport inspection department door shorten the 35kV partial discharge of switchgear patrol and detection period, return step (2)；
Step (8), teams and groups carry out 35kV partial discharge of switchgear using TEV detection mode combining ultrasonic wave detection mode again and patrol
Inspection is surveyed, and is recorded to patrol and detection result；
Step (9), teams and groups carry out state according to the patrol and detection result of TEV detection mode combining ultrasonic wave detection mode and tentatively sentence
It is disconnected, if normal condition, then return step (7)；If abnormality, then (10) are entered step；
Step (10), teams and groups carry out state judgement to testing result again, decline state if abnormal possibility, then return step
(8)；If precarious position, then (11) are entered step；
Step (11) carries out interruption maintenance to respective switch cabinet, and uses TEV detection mode again to the switchgear after the completion of maintenance
Secondary carry out Partial Discharge Detection carries out testing result record, is managed to detection data after detecting state is normal, and
Examining report is worked out, professional room reports to transport inspection department door after auditing to examining report.
2. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 1, feature exist
In the TEV detection mode, that is, transient state voltage-to-ground detection examines transient state voltage-to-ground using coupled capacitor sensor
It surveys.
3. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 2, feature exist
In the Measurement bandwidth of the coupled capacitor sensor is 3MHz~60MHz；Linear module is dB/mV, 1dB/mV=20log
(V), wherein V is the transient state voltage-to-ground amplitude measured；When the Partial discharge signal amplitude of the inside switch cabinet measured is greater than
20dB/mV, the probability for destructive malfunction occur is 75%, and when being greater than 30dB/mV, the probability for destructive malfunction occur is 90%.
4. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 3, feature exist
In the TEV detection carries out the Primary Location of partial discharge point using amplitude positioning method, the position partial discharge letter closer close to discharge source
Number amplitude is bigger, and playing a game with putting by the Partial discharge signal amplitude difference between switchgear carries out a simple Primary Location.
5. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 4, feature exist
In the TEV detection carries out the accurate positioning of partial discharge point using positioning using TDOA mode, is distinguished using two coupled capacitor sensors
It is placed on the different position in switchgear surface, and then judges the position of discharge source；What if first coupled capacitor sensor detected
The Partial discharge signal amplitude that second coupled capacitor sensor of Partial discharge signal Amplitude Ration detects is big, then judges the position of shelf depreciation
Close to first coupled capacitor sensor；If first coupling of Partial discharge signal Amplitude Ration that second coupled capacitor sensor detects
The Partial discharge signal amplitude that conjunction capacitance sensor detects is big, then judge shelf depreciation is located proximate to second coupled capacitor sensing
Device；Position by changing coupled capacitor sensor can be accurately positioned out the position of partial discharge point.
6. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 4, feature exist
In the TEV detection carries out the accurate positioning of partial discharge point using positioning using TDOA mode, is distinguished using multiple coupled capacitor sensors
It is placed on the different position in switchgear surface, and then judges the position of discharge source；The coupling of the Partial discharge signal amplitude maximum detected
Position of the capacitance sensor from partial discharge point is nearest；Position by changing coupled capacitor sensor can be accurately positioned out partial discharge point
Position.
7. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 1, feature exist
In the ultrasound examination mode passes through measurement 20kHz using acoustic pressure formula ultrasonic sensor or piezoelectric-type ultrasonic wave sensor
Ultrasonic signal within the scope of~50kHz reaches the measurement purpose to inside switch cabinet Partial discharge signal.
8. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 7, feature exist
In the Measurement bandwidth of the ultrasonic sensor is 20kHz~50kHz；Linear module is dB/ μ V, 1dB/ μ V=20log (V),
Voltage signal magnitude corresponding to the ultrasonic signal that wherein V measures for ultrasonic sensor；When measured by partial discharge
When caused ultrasonic signal is greater than 6dB/ μ V, hiss is heard by earphone, showing the switchgear, there are apparent partial discharges
Phenomenon.
9. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 8, feature exist
In the ultrasound examination carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using two ultrasonic sensors point
It is not placed on the different position in switchgear surface, and then judges the position of discharge source；What if first ultrasonic sensor detected
The Partial discharge signal amplitude that second ultrasonic sensor of Partial discharge signal Amplitude Ration detects is big, then judges that the position of shelf depreciation is leaned on
Nearly first ultrasonic sensor；If first ultrasonic wave of Partial discharge signal Amplitude Ration that second ultrasonic sensor detects passes
The Partial discharge signal amplitude that sensor detects is big, then judge shelf depreciation is located proximate to second ultrasonic sensor；By changing
The position for becoming ultrasonic sensor can be accurately positioned out the position of partial discharge point.
10. a kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure according to claim 8, feature exist
In the ultrasound examination carries out the accurate positioning of partial discharge point using positioning using TDOA mode, using multiple ultrasonic sensors point
It is not placed on the different position in switchgear surface, and then judges the position of discharge source；The Partial discharge signal amplitude maximum detected surpasses
Position of the sonic sensor from partial discharge point is nearest；Position by changing ultrasonic sensor can be accurately positioned out partial discharge point
Position.
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| CN201811444771.4A CN109444693A (en) | 2018-11-29 | 2018-11-29 | A kind of 35kV switch cabinet partial discharge detection method based on the detection that do not have a power failure |
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