CN111624453A - Distribution cable partial discharge off-line testing device - Google Patents
Distribution cable partial discharge off-line testing device Download PDFInfo
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- CN111624453A CN111624453A CN202010408520.1A CN202010408520A CN111624453A CN 111624453 A CN111624453 A CN 111624453A CN 202010408520 A CN202010408520 A CN 202010408520A CN 111624453 A CN111624453 A CN 111624453A
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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
- G01R31/16—Construction of testing vessels; Electrodes therefor
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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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention provides a distribution cable partial discharge off-line testing device which comprises a three-phase plum blossom connecting device, a high-voltage measuring bin and a partial discharge detecting device, wherein the three-phase plum blossom connecting device is connected with the high-voltage measuring bin through a flexible three-phase cable, and the high-voltage measuring bin is connected with the partial discharge detecting device. The invention does not need to release the cable from the terminal before testing, can accurately filter the terminal discharge pulse and other interference pulses in the detection process, and improves the efficiency and the anti-interference capability of the offline partial discharge detection of the cable.
Description
Technical Field
The invention relates to the technical field of partial discharge detection, in particular to a distribution cable partial discharge off-line testing device.
Background
The distribution cable is power equipment for realizing long-distance transmission of distribution network energy, and the reliability of the distribution cable directly influences the power utilization condition of an area. Due to the reasons of increased service life, improper construction, external force damage and the like, cable faults and even explosion are often caused, and more than 90% of faults of the cable are insulation faults according to incomplete statistics. Therefore, it is important to perform cable insulation state detection.
Partial discharge detection is currently the most common and effective way of cable insulation state assessment. The partial discharge detection of the cable mainly comprises off-line detection and on-line detection, the off-line detection technology at home and abroad is mature at present, an oscillatory wave partial discharge detection device, an ultralow frequency partial discharge detection device, a cosine square wave partial discharge detection device and the like appear in succession, the high voltage is applied to the cable to further excite the partial discharge in the cable, and the partial discharge detection and positioning are realized by adopting a sensor mode of detecting impedance or HFCT (high frequency computed tomography), and the devices have good application effects by the advantages of good flexibility, high sensitivity and the like. However, these devices also have some disadvantages during use, for example, these off-line detection devices must remove the cable from the terminal for testing when detecting the partial discharge of the cable, mainly because of preventing the circuit breaker from being damaged and preventing the partial discharge of the cable from being affected by non-harmful discharge such as corona discharge of the terminal. However, the cable is detached from the terminal, so that the defects that time and labor are consumed, contact resistance is increased easily due to repeated detachment, and a joint is heated and damaged are caused; in addition, when in-station detection, the site interference noise is very large and is mainly coupled into the cable and the detection device through the switch cabinet, so that the signal-to-noise ratio is obviously reduced.
Disclosure of Invention
The invention aims to overcome the defects that the detection is time-consuming and labor-consuming and is easy to consume, and the signal-to-noise ratio is low due to the influence of coupling interference noise of a switch cabinet caused by the fact that a cable needs to be disconnected in the existing partial discharge offline detection process, and provides a distribution cable partial discharge offline testing device. The invention does not need to release the cable from the terminal before testing, can accurately filter the terminal discharge pulse and other interference pulses in the detection process, and improves the efficiency and the anti-interference capability of the offline partial discharge detection of the cable.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a distribution cable partial discharge off-line testing arrangement, wherein, includes three-phase plum blossom connecting device, high-pressure measurement storehouse and partial discharge detection device, three-phase plum blossom connecting device with the high-pressure measurement storehouse passes through flexible three-phase cable junction, the high-pressure measurement storehouse with partial discharge detection device connects. When carrying out partial discharge detection, need not dismantle the cable from the terminal, only need open the break chamber, pull out the circuit breaker, insert cable terminal with three-phase plum blossom connecting device, the high-pressure measurement storehouse passes through flexible three-phase cable and three-phase plum blossom connecting device access cable, all partial discharge's signal is gathered to partial discharge detection device in the high-pressure measurement storehouse, the signal with all gathers carries out the processing analysis at partial discharge detection device, filtering terminal discharge pulse and other interference pulse, the partial discharge signal on the accurate judgement cable, improve the accuracy that cable off-line partial discharge detected.
Further, three-phase plum blossom connecting device includes that A looks plum blossom contact, A looks spliced pole, B looks plum blossom contact, B looks spliced pole, C looks plum blossom contact, C looks spliced pole and three-phase connect the row, A looks spliced pole, B looks spliced pole and C are connected the post and are located the three-phase connects on the row, A looks plum blossom contact, B looks plum blossom contact and C looks plum blossom contact respectively with A looks spliced pole, B looks spliced pole and C are connected the post and are connected correspondingly, flexible three-phase cable with the three-phase connects the row and connects.
Further, A looks plum blossom contact, B looks plum blossom contact and C looks plum blossom contact all include the copper spring, still including spring copper sheet, magnet, fastening copper sheet and the insulating filler that stacks in proper order, the copper spring will stack in proper order spring copper sheet, magnet, fastening copper sheet and insulating filler are fixed, A looks spliced pole, B looks spliced pole and C looks spliced pole all with the three-phase row of connecing passes through bushing.
Further, the high-voltage measuring bin comprises a three-phase joint, an A-phase copper column, a B-phase copper column, a C-phase copper column, an A-phase single-core cable, a B-phase single-core cable and a C-phase single-core cable, wherein a first A-phase 10kV sleeve and a second A-phase 10kV sleeve are respectively arranged at two ends of the A-phase copper column, one end of the A-phase copper column is connected with the three-phase joint through the first A-phase 10kV sleeve, the other end of the A-phase copper column is connected with the A-phase single-core cable through the second A-phase 10kV sleeve, a first B-phase 10kV sleeve and a second B-phase 10kV sleeve are respectively arranged at two ends of the B-phase copper column, one end of the B-phase copper column is connected with the three-phase joint through the first B-phase 10kV sleeve, the other end of the B-phase copper column is connected with the B-phase single-core cable through the second B-phase 10kV sleeve, a first C-phase 10kV sleeve and a second C-phase 10kV sleeve are respectively arranged at two ends of, one end of the C-phase copper column is connected with the three-phase joint through the first C-phase 10kV sleeve, and the other end of the C-phase copper column is connected with the C-phase single-core cable through the second C-phase 10kV sleeve.
Further, be equipped with an off-line measuring device on the high-pressure measuring storehouse, the high-pressure measuring storehouse passes through A looks single core cable, B looks single core cable and C looks single core cable with off-line detecting device connects, off-line detecting device with partial discharge detecting device connects. This technical scheme can insert high-pressure measuring storehouse with other off-line detection device, off-line detection device inserts the cable through three-phase plum blossom connecting device and high-pressure measuring storehouse, off-line detection device applys high pressure or other specific type's electric current to the cable, partial discharge detection device gathers the feedback signal that the cable produced and inputs off-line detection device again and carries out analysis processes, just so need not dismantle the cable from the terminal, can directly carry out other detections through three-phase plum blossom connecting device, high-pressure measuring storehouse and partial discharge detection device to the cable, wherein off-line detection device can be partial discharge detection equipment such as supporting oscillatory wave, cosine square wave, sine ultra low frequency.
Furthermore, an A-phase HFCT is arranged on the A-phase copper column, a B-phase HFCT is arranged on the B-phase copper column, a C-phase HFCT is arranged on the C-phase copper column, and the A-phase HFCT, the B-phase HFCT and the C-phase HFCT are all connected with the partial discharge detection device. The partial discharge detection device comprises a ground wire HFCT, a filtering amplification unit, a pulse polarity detection module, a data acquisition unit, a micro-processing unit, a WIFI module, a power supply unit and a serial port 485 wire, wherein the ground wire HFCT, an A-phase HFCT, a B-phase HFCT and a C-phase HFCT are all connected with the filtering amplification unit, the filtering amplification unit is connected with the pulse polarity detection module, the pulse polarity detection module is respectively connected with the data acquisition unit and the micro-processing unit, the data acquisition unit, the WIFI module and the serial port 485 wire are all connected with the micro-processing unit, and the power supply unit is connected with the filtering amplification unit, the pulse polarity detection module, the data acquisition unit and the micro-processing unit. The HFCT is a high-frequency current transformer, in the technical scheme, the A-phase HFCT, the B-phase HFCT and the C-phase HFCT can collect all partial discharge signals transmitted in different phases in a distribution cable, the ground wire HFCT is connected to a cable ground wire, all partial discharge signals transmitted in the cable ground wire are collected, signals collected by the A-phase HFCT, the B-phase HFCT and the C-phase HFCT and signals collected by the ground wire HFCT are input into a filtering and amplifying unit for filtering and amplifying, the filtered and amplified signals enter a pulse polarity detection module, the pulse polarity detection module detects the pulse output polarity of each HFCT collected signal, the pulse output polarity is input into a microprocessing unit, meanwhile, the pulse polarity detection module also accesses the filtered and amplified signals into a data collection unit, the data collection unit collects and records each HFCT collected signal, the microprocessing unit compares the pulse output polarity of the three-phase HFCT with the pulse output polarity of the bottom wire HFCT respectively, when the pulse output polarities of the two are the same, the phase partial discharge can be judged to be from the cable; when the pulse output polarities are different, judging that the phase partial discharge comes from the positions of a terminal connector, a switch cabinet (a main mode of interference coupling in a station) and the like; through the WIFI module and the serial port 485 line, the micro-processing unit can output signals collected by the partial discharge detection device, and when the high-voltage measurement bin and the partial discharge detection device are connected with other existing offline detection devices, the partial discharge detection device can feed the measured signals back to the offline detection device through the WIFI module and the serial port 485 line for analysis and processing; for example, a partial discharge detection device supporting oscillation waves, cosine square waves, sine ultralow frequencies and the like is connected between the high-voltage measurement bin and the partial discharge detection device.
Furthermore, a power line is arranged on the power supply unit, and a WIFI antenna is arranged on the WIFI module. The power supply unit supplies power to the filtering amplification unit, the pulse polarity detection module, the data acquisition unit and the micro-processing unit.
Further, the pulse polarity detection module comprises an a-phase HFCT pulse polarity detection unit, a B-phase HFCT pulse polarity detection unit, a C-phase HFCT pulse polarity detection unit, and a ground line HFCT pulse polarity detection unit, wherein the a-phase HFCT is connected with the a-phase HFCT pulse polarity detection unit, the B-phase HFCT is connected with the B-phase HFCT pulse polarity detection unit, the C-phase HFCT is connected with the C-phase HFCT pulse polarity detection unit, and the ground line HFCT is connected with the ground line HFCT pulse polarity detection unit.
Further, the a-phase HFCT pulse polarity detection unit, the B-phase HFCT pulse polarity detection unit, the C-phase HFCT pulse polarity detection unit, and the ground line HFCT pulse polarity detection unit each include a forward comparator, a backward comparator, an enable controller of the forward comparator, a forward peak value holder, an adder, and a follower, the forward comparator is connected to the enable controller of the forward comparator, the backward comparator is connected to the enable controller of the backward comparator, the forward comparator and the backward comparator are connected to the forward peak value holder, and the enable controller of the forward comparator, the enable controller of the backward comparator, and the forward peak value holder are connected to the adder. Signals detected by the HFCTs are input into corresponding HFCT pulse polarity detection units, detection signals enter the HFCT pulse polarity detection units and then simultaneously enter a forward comparator, a reverse comparator and a follower, and the detection signals enter the follower and then are directly output to enter a data acquisition unit; when the pulse polarity of the input detection signal is positive, a forward comparator is triggered to generate a positive pulse, the pulse peak value is kept through a forward peak value keeper and a reverse peak value keeper, the output of the reverse comparator is 0 through an enabling controller of the forward comparator, the reverse comparator fails, and an adder outputs the signal polarity and the peak value to enter a micro-processing unit; when the polarity of the detection signal pulse of the input signal is negative, the polarity is opposite; the micro-processing unit compares the pulse polarity and the peak value output by the A-phase HFCT pulse polarity detection unit, the B-phase HFCT pulse polarity detection unit and the C-phase HFCT pulse polarity detection unit with the pulse polarity and the peak value output by the ground wire HFCT pulse polarity detection unit respectively, when the signal polarities are positive or negative, the micro-processing unit judges that the partial discharge signal of the phase is a signal released by partial discharge of a cable, and when the signal polarities are positive or negative, the micro-processing unit judges that terminal discharge or other coupling interference exists.
Compared with the prior art, the invention has the beneficial effects that:
1. the three-phase plum blossom connecting device is adopted, so that the situation that the cable needs to be detached from the terminal before partial discharge detection is carried out on the cable can be avoided, the problems of time consumption and labor consumption caused by detachment of the cable terminal are solved, and the efficiency of partial discharge detection is improved;
2. according to the invention, through the cooperation of the high-voltage measuring bin and the partial discharge detection device, a closed-loop control circuit is formed, pulse polarity judgment is carried out on a partial discharge signal, the number of sampling channels is reduced, the cost is reduced, and the efficiency is improved;
3. in the partial discharge detection device, accurate distinguishing of cable discharge, terminal discharge and external interference is realized by comparing pulse polarities of the ground wire HFCT and the three-phase HFCT, so that the influence of the terminal discharge on the partial discharge detection of the cable is avoided, and the anti-interference capability of off-line detection equipment is improved;
4. the invention can additionally install other off-line detection devices on the high-voltage detection bin and the partial discharge detection device to perform other partial discharge experiment detection on the cable, and has strong expandability.
Drawings
FIG. 1 is a schematic structural diagram of an off-line testing apparatus for partial discharge of a distribution cable according to the present invention;
FIG. 2 is a schematic structural diagram of a three-phase plum blossom connecting device according to the present invention;
FIG. 3 is a circuit diagram of a filter amplifying unit according to the present invention;
FIG. 4 is a circuit diagram of an A-phase HFCT pulse polarity detection unit according to the present invention;
FIG. 5 is a circuit diagram of a B-phase HFCT pulse polarity detection unit according to the present invention;
FIG. 6 is a circuit diagram of a C-phase HFCT pulse polarity detection unit according to the present invention;
FIG. 7 is a circuit diagram of a ground line HFCT pulse polarity detection unit according to the present invention;
fig. 8 is a schematic diagram illustrating a pulse polarity detection module in the distribution cable partial discharge offline testing apparatus according to the first embodiment for determining a pulse polarity;
fig. 9 is a schematic diagram illustrating a micro-processing unit in an off-line testing apparatus for partial discharge of a distribution cable according to a second embodiment.
The graphic symbols are illustrated as follows:
1-three-phase plum blossom connecting device, 2-high voltage measuring cabin, 3-partial discharge detecting device, 4-A phase plum blossom contact, 401-fastening copper sheet, 402-magnet, 403-spring copper sheet, 404-insulating filler, 405-copper spring, 5-A phase connecting column, 501-bushing, 6-B phase plum blossom contact, 7-B phase connecting column, 8-C phase plum blossom contact, 9-C phase connecting column, 10-three phase connecting row, 11-flexible three-phase cable, 12-three phase joint, 13-A phase copper column, 14-B phase copper column, 15-C phase copper column, 16-A phase HFCT, 17-B phase HFCT, 18-C phase HFCT, 19-A phase monocable cable, 20-B phase monocable cable, 21-C phase monocable cable, 22-ground wire HFCT, 23-filtering amplification unit, 24-pulse polarity detection module, 25-data acquisition unit, 26-power supply unit, 27-microprocessing unit, 28-WIFI module, 29-serial port 485 line, 30-WIFI antenna, 31-power line, 32-first filter circuit, 33-second filter circuit, 34-A phase HFCT pulse polarity detection unit, 35-B phase HFCT pulse polarity detection unit, 36-C phase HFCT pulse polarity detection unit connection, 37-ground wire HFCT pulse polarity detection unit, 38-forward comparator, 39-reverse comparator, 40-forward and reverse peak value holder, 41-enable controller of forward comparator, 42-enable controller of reverse comparator, 43-follower, 44-adder.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
First embodiment
As shown in fig. 1, the three-phase tulip connection device 1 includes an a-phase tulip contact 4, an a-phase connection column 5, a B-phase tulip contact 6, a B-phase connection column 7, a C-phase tulip contact 8, a C-phase connection column 9, and a three-phase connection row 10, wherein the a-phase connection column 5, the B-phase connection column 6, and the C-phase connection column 7 are located on the three-phase connection row 10, the a-phase tulip contact 4, the B-phase tulip contact 6, and the C-phase tulip contact 8 are respectively connected with the a-phase connection column 5, the B-phase connection column 7, and the C-phase connection column 9.
As shown in fig. 2, each of the a-phase tulip contact 4, the B-phase tulip contact 6, and the C-phase tulip contact 8 includes a spring copper sheet 403, a magnet 402, a fastening copper sheet 401, an insulating filler 404, and a copper spring 405, the spring copper sheet 403, the magnet 402, the fastening copper sheet 401, and the insulating filler 404 are sequentially stacked, the copper spring 405 fixes them, the a-phase connection column 5, the B-phase connection column 7, and the C-phase connection column 9 are copper columns, and the copper columns are connected to the three-phase connection row 10 through a bushing 501. The copper spring 405 is diameter 5mm, and the copper wire of line footpath 1mm is coiled, and the diameter 2cm of copper post, length 5cm, sleeve pipe 501 adopt the compound sleeve pipe of silica gel, and small weight is light, and 10kV BTLY flexible cable is selected to flexible three-phase cable 11, and the insulating casing material that the three-phase connects row 10 is ABS insulating material.
In this embodiment, the high voltage measuring chamber 2 includes a three-phase connector 12, an a-phase copper column 13, a B-phase copper column 14, a C-phase copper column 15, an a-phase monocable 19, a B-phase monocable 20, and a C-phase monocable 21, both ends of the a-phase copper column 13 are respectively provided with a first a-phase 10kV bushing and a second a-phase 10kV bushing, one end of the a-phase copper column 13 is connected to the three-phase connector 12 through the first a-phase 10kV bushing, the other end of the a-phase copper column is connected to the a-phase monocable 19 through the second a-phase 10kV bushing, both ends of the B-phase copper column 14 are respectively provided with a first B-phase 10kV bushing and a second B-phase 10kV bushing, one end of the B-phase copper column 14 is connected to the three-phase connector 12 through the first B-phase 10kV bushing, the other end of the B-phase copper column is connected to the B-phase monocable 20 through the second B-phase 10kV bushing, both ends of the C-phase copper column 15 are respectively provided with a first, one end of the C-phase copper column 15 is connected with the three-phase connector 12 through a first C-phase 10kV sleeve, and the other end of the C-phase copper column 15 is connected with the C-phase single-core cable 21 through a second C-phase 10kV sleeve.
The A-phase copper column 13 is provided with an A-phase HFCT16, the B-phase copper column 14 is provided with a B-phase HFCT17, the C-phase copper column 15 is provided with a C-phase HFCT18, and the A-phase HFCT16, the B-phase HFCT17 and the C-phase HFCT18 are all connected with the partial discharge detection device 3.
In this embodiment, the partial discharge detection device 3 includes a ground line HFCT22, a filtering amplification unit 23, a pulse polarity detection module 24, a data acquisition unit 25, a micro-processing unit 27, a WIFI module 28, a power supply unit 26, and a serial port 485 line 29, the ground line HFCT22, an a-phase HFCT16, a B-phase HFCT17, and a C-phase HFCT18 are both connected to the filtering amplification unit 23, the filtering amplification unit 23 is connected to the pulse polarity detection module 24, the pulse polarity detection module 24 is respectively connected to the data acquisition unit 25 and the micro-processing unit 27, the data acquisition unit 25, the WIFI module 28, and the serial port 485 line 29 are both connected to the micro-processing unit 27, the power supply unit 26 is connected to the filtering amplification unit 23, the pulse polarity detection module 24, the data acquisition unit 25, and the micro-processing unit 27. The power supply unit 26 is provided with a power line 31, and the WIFI module 28 is provided with a WIFI antenna 30. Signals acquired by an A-phase HFCT16, a B-phase HFCT17 and a C-phase HFCT18 and signals acquired by a ground wire HFCT22 are input into a filtering and amplifying unit 23, the signals are filtered and amplified, the filtered and amplified signals enter a pulse polarity detection module 24, the pulse polarity detection module 24 detects pulse output polarities of all HFCT acquired signals, the data acquisition unit 25 performs data acquisition and recording on all the HFCT acquired signals, a microprocessing unit 27 compares the pulse output polarities of the three-phase HFCT with pulse output polarities of the ground wire HFCT respectively, when the pulse output polarities of the two HFCT are the same, it is judged that partial discharge comes from a cable, and when the pulse output polarities are different, the partial discharge comes from a terminal connector, a switch cabinet (a main mode of interference coupling in a station) and the like.
The filtering and amplifying unit 23 is shown in fig. 3, the filtering and amplifying unit 23 is formed by connecting a first filtering circuit 32 and a second filtering circuit 33 in series, the filtering and amplifying unit 23 amplifies signals by 20 times, the bandwidth of the filtering and amplifying unit 23 is 1MHz-100MHz, and the core amplifying chip adopts ADA 4899.
As shown in fig. 4-7, the pulse polarity detection module 24 includes an a-phase HFCT pulse polarity detection unit 34, a B-phase HFCT pulse polarity detection unit 35, a C-phase HFCT pulse polarity detection unit 36, and a ground HFCT pulse polarity detection unit 37, the a-phase HFCT16 is connected to the a-phase HFCT pulse polarity detection unit 34, the B-phase HFCT17 is connected to the B-phase HFCT pulse polarity detection unit 35, the C-phase HFCT18 is connected to the C-phase HFCT pulse polarity detection unit 36, and the ground HFCT22 is connected to the ground HFCT pulse polarity detection unit 37.
Wherein, the a-phase HFCT pulse polarity detection unit 34, the B-phase HFCT pulse polarity detection unit 35, the C-phase HFCT pulse polarity detection unit 36, and the ground line HFCT pulse polarity detection unit 37 each include a forward comparator 38, a backward comparator 39, an enable controller 42 of the backward comparator, an enable controller 41 of the forward comparator, a forward peak value holder 40, an adder 44, and a follower 43, as shown in fig. 4, in the a-phase HFCT pulse polarity detection unit 34, the a-phase HFCT16 outputs the collected signal from the filtering amplification unit 23 and then accesses the forward comparator 38, the backward comparator 39, and the follower 43, the forward comparator 38 is connected to the enable controller 41 of the forward comparator, the backward comparator 39 is connected to the enable controller 42 of the backward comparator, the forward comparator 38 and the backward comparator 39 are connected to the forward peak value holder 40, the enable controller 41, the forward comparator 41, the backward comparator 41, and the ground line HFCT pulse polarity detection unit 37 are connected to the forward peak value holder 40, The enable controller 42 of the inverse comparator and the forward and reverse peak keeper 40 are both connected to an adder 44, the follower 43 outputs the a-phase signal and the adder outputs the a-phase signal with polarity. The forward comparator 38 is in a type of TLV3501, the backward comparator 39 is in a type of TLV3501, the enable controller 42 of the backward comparator is ADA4899, the enable controller 41 of the forward comparator is in an ADA4899, the forward peak keeper 40 is in series of 1BH62 and ADA4899, the adder 44 is in an ADA4899, and the follower 43 is in an ADA 4899.
In this embodiment, when the polarity of the input pulse is positive, the forward comparator 38 is triggered to generate a positive pulse with an amplitude of 5V, then the forward pulse peak value is held by the forward and reverse peak value holder 40, the enable controller 41 of the forward comparator enables the output of the reverse comparator 39 to be 0, and the reverse comparator 39 is disabled; when the input pulse polarity is negative, the operation principle is the same as above, however, the positive and negative peak value keeper 40 holds the peak value of the reverse pulse, and the positive comparator 38 is disabled by the enable controller 42 of the reverse comparator, and finally the signal polarity is outputted by the adder 44, as shown in fig. 7.
The working principle of the embodiment is as follows: the breaking room is opened, the breaker is pulled out, the three-phase plum blossom connecting device 1 is connected to a cable terminal, the high-voltage measuring bin 2 is connected to a cable through the flexible three-phase cable 11 and the three-phase plum blossom connecting device 1, and the ground wire HFCT22 is connected to a cable ground wire; the A-phase HFCT16, the B-phase HFCT17, the C-phase HFCT18 and the ground HFCT22 respectively collect and receive all partial discharge signals of three phases and ground, the collected signals are input into a pulse polarity detection module of the partial discharge detection device 3, the collected signals are input into the microprocessing unit 27 after the pulse polarities of the signals are judged, the pulse polarities of the three phases of the signals are respectively compared with the pulse polarities of the ground signal in the microprocessing unit 27, as shown in FIG. 8, when the signal polarities are positive or negative, the microprocessing unit 27 judges that the phase is cable partial discharge, and when the signal polarities are positive or negative, the microprocessing unit 27 judges that terminal discharge or other coupling interference exists. When the cable is subjected to partial discharge, pulse current of the partial discharge enters the partial discharge detection device 3 from the three-phase plum blossom connecting device 1 through the high-voltage measurement bin 2, and then the ground wire of the cable is input from the ground wire of the partial discharge detection device 3 underground, so that the ground wire HFCT22 receives a partial discharge signal and the three-phase HFCT in the high-voltage measurement bin 2 receives the partial discharge signal, the current signal directions of the two signals are the same, and the pulse polarities of the two signals are the same; if the partial discharge signal comes from the terminal connector or the switch cabinet, the pulse current of the partial discharge flows to the cable while flowing to the high-voltage measuring bin, and then flows to the cable grounding wire from the cable, so that the grounding wire HFCT22 receives the partial discharge signal and the three-phase HFCT in the high-voltage measuring bin 2 receives the partial discharge signal, and the pulse polarities of the two signals are opposite because the current signals are opposite; the micro-processing unit 27 can eliminate the influence of terminal discharge or other switch cabinet coupling interference on the cable partial discharge detection from the pulse polarity comparison result, and screen out the cable partial discharge signal, thereby improving the accuracy of the cable partial discharge detection.
Second embodiment
This embodiment is similar to the first embodiment, except that fig. 9 is a matching diagram of the microprocessing unit 27, in which, taking an a-phase test as an example, when the discharge position occurs at different positions, the polarity direction of the high-frequency current is different, on the premise of ensuring that the clamping direction of the ground wire and the HFCT of the a-phase conductor is the same, when the partial discharge is from the cable, the direction of the pulse current in the ground wire and the a-phase conductor is the same, when the partial discharge is from the terminal connector, the switch cabinet (the main mode of interference coupling in the station), etc., the direction of the pulse current in the ground wire and the a-phase conductor is opposite, the determination of the pulse source can be realized by determining the pulse output polarities of the two HFCTs, when the pulse output polarities of the two HFCTs are the same, the pulse is from the cable is determined to be successfully matched, when the pulse output polarities of the two HFCTs are not the same, the pulse is determined to be from the terminal connector, if the matching fails, the microprocessor 27 deletes the data of the pulse from the memory, and only retains the effective data of the cable partial discharge, thereby removing the influence of the terminal discharge or other coupling interference on the cable partial discharge detection and improving the accuracy of the cable partial discharge detection.
Third embodiment
The present embodiment is similar to the first embodiment, except that the partial discharge detection device supporting the sinusoidal ultra low frequency is connected to the high voltage measurement chamber 2 through the a-phase single core cable 19, the B-phase single core cable 20, and the C-phase single core cable 21, and the partial discharge detection device 3 transmits the feedback signal of the cable to the partial discharge detection device supporting the sinusoidal ultra low frequency through the serial port 485 line 29 and the WIFI module 28. It should be noted that other partial discharge detection devices supporting oscillatory waves, cosine square waves and the like can be connected to the high-voltage measurement cabin 2 through the a-phase single-core cable 19, the B-phase single-core cable 20 and the C-phase single-core cable 21 to perform related detection on the cables.
The working principle of the embodiment is as follows: the sinusoidal ultralow frequency partial discharge detection device can send out sinusoidal ultralow frequency current, the sinusoidal ultralow frequency current is input into a cable through the high-voltage test bin 2 and the three-phase plum blossom connecting device 1, the A-phase HFCT16, the B-phase HFCT17, the C-phase HFCT18 and the ground wire HFCT22 collect feedback signals generated by the cable, and the partial discharge detection device 3 transmits the collected feedback signals into the sinusoidal ultralow frequency partial discharge detection device for analysis and processing through the serial port 485 line 29 and the WIFI module 28. Therefore, the cable does not need to be detached from the terminal, and other partial discharge test detection can be directly carried out on the cable through the three-phase plum blossom connecting device 1, the high-voltage measuring bin 2 and the partial discharge detection device 3.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a distribution cable partial discharge off-line testing arrangement which characterized in that: the device comprises a three-phase plum blossom connecting device, a high-voltage measuring bin and a partial discharge detection device, wherein the three-phase plum blossom connecting device is connected with the high-voltage measuring bin through a flexible three-phase cable, and the high-voltage measuring bin is connected with the partial discharge detection device.
2. The distribution cable partial discharge off-line testing device of claim 1, wherein: three-phase plum blossom connecting device includes that A looks plum blossom contact, A looks spliced pole, B looks plum blossom contact, B looks spliced pole, C looks plum blossom contact, C looks spliced pole and three-phase connect the row, A looks spliced pole, B looks spliced pole and C looks spliced pole are located the three-phase connects on the row, A looks plum blossom contact, B looks plum blossom contact and C looks plum blossom contact respectively with A looks spliced pole, B looks spliced pole and C are connected the post and correspond the connection, flexible three-phase cable with the three-phase connects the row and connects.
3. The distribution cable partial discharge off-line testing device of claim 2, wherein: a looks plum blossom contact, B looks plum blossom contact and C looks plum blossom contact all include the copper spring, still including the spring copper sheet, magnet, fastening copper sheet and the insulating filler that stack in proper order, the copper spring will stack in proper order spring copper sheet, magnet, fastening copper sheet and insulating filler are fixed, A looks spliced pole, B looks spliced pole and C looks spliced pole all with the three-phase connects row and passes through bushing.
4. The distribution cable partial discharge off-line testing device of claim 2, wherein: the high-voltage measuring bin comprises a three-phase joint, an A-phase copper column, a B-phase copper column, a C-phase copper column, an A-phase single-core cable, a B-phase single-core cable and a C-phase single-core cable, wherein a first A-phase 10kV sleeve and a second A-phase 10kV sleeve are respectively arranged at two ends of the A-phase copper column, one end of the A-phase copper column is connected with the three-phase joint through the first A-phase 10kV sleeve, the other end of the A-phase copper column is connected with the A-phase single-core cable through the second A-phase 10kV sleeve, a first B-phase 10kV sleeve and a second B-phase 10kV sleeve are respectively arranged at two ends of the B-phase copper column, one end of the B-phase copper column is connected with the three-phase joint through the first B-phase 10kV sleeve, the other end of the B-phase copper column is connected with the B-phase single-core cable through the second B-phase 10kV sleeve, a first C-phase 10kV sleeve and a second C-phase 10kV sleeve are respectively arranged at two, one end of the C-phase copper column is connected with the three-phase joint through the first C-phase 10kV sleeve, and the other end of the C-phase copper column is connected with the C-phase single-core cable through the second C-phase 10kV sleeve.
5. The distribution cable partial discharge off-line testing device of claim 4, wherein: the high-voltage measuring bin is provided with an off-line detection device, the high-voltage measuring bin passes through the A-phase single-core cable, the B-phase single-core cable and the C-phase single-core cable and is connected with the off-line detection device, and the off-line detection device is connected with the partial discharge detection device.
6. The distribution cable partial discharge off-line testing device of claim 4, wherein: and the A-phase copper cylinder is provided with an A-phase HFCT, the B-phase copper cylinder is provided with a B-phase HFCT, the C-phase copper cylinder is provided with a C-phase HFCT, and the A-phase HFCT, the B-phase HFCT and the C-phase HFCT are all connected with the partial discharge detection device.
7. The apparatus of claim 6, wherein the apparatus comprises: the partial discharge detection device comprises a ground wire HFCT, a filtering amplification unit, a pulse polarity detection module, a data acquisition unit, a micro-processing unit, a WIFI module, a power supply unit and a serial port 485 wire, wherein the ground wire HFCT, an A-phase HFCT, a B-phase HFCT and a C-phase HFCT are all connected with the filtering amplification unit, the filtering amplification unit is connected with the pulse polarity detection module, the pulse polarity detection module is respectively connected with the data acquisition unit and the micro-processing unit, the data acquisition unit, the WIFI module and the serial port 485 wire are all connected with the micro-processing unit, and the filtering amplification unit, the pulse polarity detection module, the data acquisition unit and the micro-processing unit are all connected with the power supply unit.
8. The apparatus of claim 7, wherein the apparatus comprises: the power supply unit is provided with a power line, and the WIFI module is provided with a WIFI antenna.
9. The apparatus of claim 7, wherein the apparatus comprises: the pulse polarity detection module comprises an A-phase HFCT pulse polarity detection unit, a B-phase HFCT pulse polarity detection unit, a C-phase HFCT pulse polarity detection unit and a ground wire HFCT pulse polarity detection unit, wherein the A-phase HFCT is connected with the A-phase HFCT pulse polarity detection unit, the B-phase HFCT is connected with the B-phase HFCT pulse polarity detection unit, the C-phase HFCT is connected with the C-phase HFCT pulse polarity detection unit, and the ground wire HFCT is connected with the ground wire HFCT pulse polarity detection unit.
10. The apparatus of claim 9, wherein the apparatus comprises: the detection device comprises an A-phase HFCT pulse polarity detection unit, a B-phase HFCT pulse polarity detection unit, a C-phase HFCT pulse polarity detection unit and a ground wire HFCT pulse polarity detection unit, wherein the A-phase HFCT pulse polarity detection unit, the B-phase HFCT pulse polarity detection unit, the C-phase HFCT pulse polarity detection unit and the ground wire HFCT pulse polarity detection unit respectively comprise a forward comparator, a reverse comparator, an enable controller of the forward comparator, a forward peak value keeper, an adder and a follower, the forward comparator is connected with the enable controller of the forward comparator, the reverse comparator is connected with the enable controller of the reverse comparator, the forward comparator and the reverse peak value are connected with the forward peak value keeper, and the enable controller of the forward comparator, the enable controller of the reverse comparator and the forward peak value keeper are connected with the adder.
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| CN112255510A (en) * | 2020-09-14 | 2021-01-22 | 广东电网有限责任公司 | Device and method for improving detection sensitivity of partial discharge of distribution cable |
| CN113589089A (en) * | 2021-08-27 | 2021-11-02 | 中天集团上海超导技术有限公司 | Cable test equipment |
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