CN203232129U - Test platform for middle pressure switch cabinet partial discharge detection - Google Patents
Test platform for middle pressure switch cabinet partial discharge detection Download PDFInfo
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- CN203232129U CN203232129U CN 201320061895 CN201320061895U CN203232129U CN 203232129 U CN203232129 U CN 203232129U CN 201320061895 CN201320061895 CN 201320061895 CN 201320061895 U CN201320061895 U CN 201320061895U CN 203232129 U CN203232129 U CN 203232129U
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Abstract
Disclosed is a test platform for middle pressure switch cabinet partial discharge detection. The test platform includes: a metal cabinet body, a fault model, a signal detection unit, three conductive rods, and a power frequency high voltage power source. The conductive rods stand vertically in the metal cabinet in a symmetrical way, and each of the conductive rods includes an upper conductive rod and a lower conductive rod, wherein the upper end of the upper conductive rod goes through the top part of the metal cabinet and is connected with a terminal, the lower end of the upper conductive rod is connected with the fault model, the upper end of the lower conductive rod is connected with the fault model, and the lower end of the lower conductive rod is connected with the cabinet body. The signal detection unit includes: an ultrasonic sensor, an ultrahigh frequency sensor, a first digital oscilloscope, a second digital oscilloscope, a TEV sensor, a Rogowski coil, and a high voltage probe, wherein the ultrasonic sensor and the ultrahigh frequency sensor are arranged near a square hole of the metal cabinet and are connected with the first digital oscilloscope and the second digital oscilloscope respectively, the TEV sensor is adhered to an external surface of the metal cabinet and is connected with the second digital oscilloscope, the Rogowski coil is winded around the lower conductive rod, the high voltage probe is disposed on a high voltage input line of a terminal of a insulator, the Rogowski coil and the high voltage probe are connected with the first digital oscilloscope, and the power frequency high voltage power source is connected to a terminal. The test platform for middle pressure switch cabinet partial discharge detection has advantages of being capable of simulating partial discharge of a switch cabinet, being convenient to move and operate, being good in safety performance by fully considering insulation distance.
Description
Technical field
The utility model relates to a kind of test platform, especially relates to a kind of for Partial Discharge Detection test platform in the Medium Voltage Switchgear.
Background technology
Medium Voltage Switchgear is to the most direct equipment of user's power supply.Electrical network requires switch cubicle to work steadily in the long term, but switch cubicle unavoidably stays the manufacturability defective on the one hand during fabrication, be subjected to electromagnetic heating on the other hand, factor such as ambient humidity, dust, special coastland, the southeast in China, humidity is very big under some particular weather situation, will seriously weaken dielectric strength.A survey according to 1989 to 1997 shows that in the fault of switch cubicle, insulation fault and current-carrying fault have accounted for 40%～50% greatly.In development early stage in insulation current-carrying fault, generally show as local faint paradoxical discharge, i.e. shelf depreciation.This moment, paradoxical discharge did not cause fatal influence to switch cubicle as yet.Catch the signal of shelf depreciation in this stage by different monitoring meanss, with the order of severity of failure judgement, determine whether need to shut down maintenance.The failure mode that produces shelf depreciation is various, but can simulate under laboratory environment with several typical fault models basically, i.e. pin-plate fault model, insulation void collapse model, floating potential fault model and surface filth fault model.The method that detects shelf depreciation is also a lot, and is common as pulse current method, supercritical ultrasonics technology, ultrahigh frequency method, transient state voltage-to-ground (TEV) method etc.Different detection methods is not quite similar to the sensitivity of different fault types, therefore can contrast confirmation mutually between the multiple detection method.China's utility model patent " a kind of switch cubicle local discharge detection device " (application publication number CN102749557A) discloses a kind of uhf sensor, calibrate AE sensor, High Frequency Current Sensor and TEV sensor of utilizing and has detected the method for local discharge signal, but only relates to detection method and do not have concrete fault model and test parameters; Chinese patent " a kind of 10kV switch cubicle partial discharge detecting system " (Granted publication CN202471902) discloses a kind of transient state voltage-to-ground (TEV) technology of utilizing the pin in the switch cubicle-plate discharge, insulation space and floating potential fault model has been carried out the system that local discharge signal detects, this system also has been equipped with auxiliary detection equipment such as Photoelectric Detection and sonic detection, but shelf depreciation initial stage signal is generally very faint, light can not appear, detection effect with photomultiplier may be undesirable, and this system does not consider the influence of humidity on the other hand.
The utility model content
Technical problem to be solved in the utility model, just provide a kind of Medium Voltage Switchgear Partial Discharge Detection test platform of frame-type, it considers the diversity of fault type and detection method, can provide to improve and experiment condition easily, and the switch cubicle Characteristics of Partial Discharge is launched synthetic study.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
A kind of Medium Voltage Switchgear Partial Discharge Detection test platform is characterized in that: comprise metal cabinet, fault model, conducting rod, detecting signal unit and power frequency high voltage source;
Described metal cabinet left and right side has a plurality of square holes, and right side square hole area is the twice of left side square hole area, and the square hole top is coated with the magnetic baffle plate; Metal cabinet inside is provided with small-sized humidifier, the inwall upper and lower side respectively is equipped with a Hygrothermograph;
Described fault model comprises model and stationary installation, and stationary installation is made up of the upper and lower screw rod quick chuck of symmetry, and model is pin-plate fault model, insulation void collapse model and floating potential fault model, is fixed between the upper and lower screw rod quick chuck;
Described conducting rod has three and be symmetrically distributed and erect in described metal cabinet, every is made of upper and lower conducting rod, the upper end of last conducting rod pass metal cabinet top and be connected with the insulator binding post, the lower end is connected with the last screw rod quick chuck of the stationary installation of fault model, following screw rod quick chuck, lower end that the upper end of following conducting rod connects the stationary installation of fault model are connected with the metal cabinet;
Described detecting signal unit comprises ultrasonic sensor, uhf sensor, TEV sensor, Luo-coil, high-voltage probe and first, second digital oscilloscope, ultrasonic sensor is arranged near the square hole of metal cabinet left and right side, is connected with first digital oscilloscope by the shielding coaxial cable; Uhf sensor is arranged near the square hole of metal cabinet left and right side, is connected with second digital oscilloscope by the shielding coaxial cable; The TEV sensor sticks on the metal cabinet outside surface, is connected with second digital oscilloscope by the shielding coaxial cable; Luo-coil is looped around on the conducting rod of lower end, is connected with first digital oscilloscope by the shielding coaxial cable; High-voltage probe is located on the high pressure inlet wire of insulator binding post, is connected with first digital oscilloscope by the shielding coaxial cable;
The insulator binding post is inserted in described power frequency high voltage source.
On the basis of the above, the utility model can also be done further to improve and improve:
Described metal cabinet is located on the brace table, and brace table comprises table top and 4 support columns, and the support column bottom is equipped with lockable pulley, is convenient to mobile;
The needle point curvature of described pin-plate fault model is 30 microns, and pin and plate are separately fixed at two parts up and down of aforementioned fixation device, and spacing is adjustable;
Described insulation space is bonded by two-layer transparent organic glass, and cylindrical electrode and organic glass closely cooperate, and the shortest insulation distance in electrode and space is 2mm.
Described floating potential fault model comprises two cylindrical electrodes, plexiglass block and suspension pin electrode; Described cylindrical electrode two ends are semisphere, embed the 10mm degree of depth in the plexiglass block, and both closely cooperate; Described plexiglass block upper surface has a diameter 1mm, the aperture of degree of depth 20mm every 90 ° around cylindrical electrode; The bee-line of described aperture and cylindrical surface is respectively 1mm, 1.5mm, 2mm, 2.5mm; Pin electrode can be placed on any one in aforementioned 4 apertures.
The beneficial effects of the utility model are:
(1) this test platform can be simulated the shelf depreciation in the true switch cubicle, is convenient to mobile and operation, and has taken into full account insulation distance, and security is good;
(2) symmetrical three-phase inlet wire post can carry three-phase alternating-current supply or single phase poaer supply, can simulate three faults at most simultaneously, also can test a certain fault and detect at the local discharge signal of diverse location;
(3) the stationary installation that adopts can replacing fault model for convenience detach, greatly promote conventional efficient;
(4) this platform is suitable for various partial discharges fault models, can carry out comprehensive experimental study to the shelf depreciation in the Medium Voltage Switchgear;
(5) this platform is suitable for multiple detection means, can obtain perfect fault model discharge information, and different detection methods is laterally contrasted;
(6) can adjust the humidity of experimental enviroment, research humidity is to the influence of shelf depreciation.
Description of drawings
Fig. 1 is vertical view of the present utility model;
Fig. 2 is cut-open view of the present utility model;
Fig. 3 is left view of the present utility model;
Fig. 4 is right view of the present utility model;
Fig. 5 is insulation void collapse model synoptic diagram of the present utility model;
Fig. 6 is pin of the present utility model-plate fault model synoptic diagram;
Fig. 7 looks synoptic diagram for floating potential fault model master of the present utility model;
Fig. 8 is floating potential fault model schematic top plan view of the present utility model;
Fig. 9 is the electric field emulation distribution plan of insulation void collapse model;
Figure 10 is the electric field emulation distribution plan of pin-plate fault model;
Figure 11 is the electric field emulation distribution plan of floating potential fault model.
Among the figure, 1 is metal cabinet wall, and 2 is the sub-inlet wire post of symmetrical three phase isolated, 3 is humidifier, and 4 is high-voltage probe, and 5 is Hygrothermograph, 6 is conducting rod, and 7 is the fault model fixed chuck, and 8 is fault model, 9 support platforms, 10 is earthing cable, and 11 is Luo-coil, and 12 is digital oscilloscope, 13 are the ultrahigh frequency probe, 14 is ultrasonic probe, and 15 are the TEV probe, and 16 is one times of area square hole, 17 is twice area square hole, 18 is the fault model electrode, and 19 is two-layer bonding poly (methyl methacrylate) plate, and 20 is the space that processes between the layer glass plate, 21 is pin electrode, 22 is plate electrode, and 23 is poly (methyl methacrylate) plate, and 24 is cylindrical aperture, 25 is the pin suspension electrode, and 26 is the baffle plate on the square hole.
Embodiment
Below in conjunction with accompanying drawing Medium Voltage Switchgear Partial Discharge Detection test platform provided by the utility model is further explained explanation.
As shown in Figure 2, Medium Voltage Switchgear Partial Discharge Detection test platform of the present utility model comprises brace table 9, metal cabinet 1, detecting signal unit, fault model 8 and power frequency high voltage source.
Have three symmetrical distributions and erect conducting rod 6 in the metal cabinet, every conducting rod 6 is made of upper and lower conducting rod 6 (a), 6 (b), the upper end of last conducting rod pass metal cabinet top and be connected with insulator binding post 2, the lower end is connected with the last screw rod quick chuck 7 (a) of the stationary installation 7 of fault model, following screw rod quick chuck 7 (b), lower end that the upper end of following conducting rod connects the stationary installation of fault model are connected with the metal cabinet.
Conducting rod 6 (a) is connected by the long fine thread of 100mm with stationary installation 7 (a) the first half, and conducting rod 6 (b) is connected by the long fine thread of 100mm with stationary installation 7 (b), is used for regulating the spacing of stationary installation 7 (a) and 7 (b);
The front end of stationary installation 7 is quick chuck, and maximum application diameter is 20mm.
High-voltage probe 4 is connected first digital oscilloscope, 12 (1), first digital oscilloscope 12 (1) and also links to each other with ultrasonic probe 14 with Luo-coil 11; Ultrahigh frequency probe 13 and TEV probe 15 link to each other with second digital oscilloscope 12 (2).
High-voltage probe 4 is used for reading the voltage waveform of inlet wire, and Luo-coil 11 is used for obtaining the current waveform of shelf depreciation;
Ultrasonic probe 14 sticks near square hole 16 or the square hole 17, by the ultrasound examination local discharge signal of induction shelf depreciation generation;
Place metal cabinet inside during humidifier 3 work, for increasing the humidity of experimental enviroment;
Hygrothermograph 5 (a) and 5 (b) are separately positioned on the top and bottom of metal cabinet 1 inwall, and temperature, the humidity in the cabinet is got the mean value of two Hygrothermographs.
As shown in Figure 3 and Figure 4, square hole 16 and square hole 17 respectively comprise 5 equidistant homalographic square holes, and the interior sectional dimension of square hole 16 is 100*6mm
2, the interior sectional dimension of square hole 17 is 100*12mm
2, for probing into the influence to input of perforate size and position.
As shown in Figure 3, baffle plate 26 is one group of 10 blocks of magnetic side's plate, and sectional dimension is 120mm*20mm, can stick to the top of square hole 16 and 17 as required or removes, and is used for electromagnetic screen and dustproof.
As shown in Figure 5, insulation void collapse model is bonded in space 20 up and down by poly (methyl methacrylate) plate 19 and symmetry about symmetrical upper/lower electrode 18, the symmetry.Electrode 18 diameter 16mm, length 60mm, two ends are semisphere, surface finish; Poly (methyl methacrylate) plate 19 diameter 100mm, thickness in monolayer 30mm; Electrode 18 embeds in the poly (methyl methacrylate) plate, and the fixed distance in top and cylindrical space 20 is 2mm.
As shown in Figure 6, the pin electrode 21 length 50mm of pin-plate fault model, 30 microns of needle point curvature; Plate electrode 22 diameter 100mm, drift angle place chamfering, surface finish; When testing this fault model pin electrode is fixed in upper grip 7 (a), plate electrode is fixed in lower chuck 7 (b), changes electrode separation by the matching thread of regulating conducting rod and stationary installation.
As shown in Figure 7 and Figure 8, the poly (methyl methacrylate) plate 23 diameter 100mm of floating potential fault model, thickness 60mm; Electrode 18 embeds 10mm in the poly (methyl methacrylate) plates 23, around high-field electrode every 90 degree, successively with 1mm, 1.5mm, the bee-line of 2mm and 2.5mm 4 the diameter 1mm that distribute, the aperture 24 of degree of depth 20mm; Suspension electrode 25 is daily draw point, is placed in the aperture 24.
As Fig. 9, Figure 10 and shown in Figure 11, the electric field of insulation void collapse model concentrates in the hole 20, so hole 20 will preferentially puncture respectively; The electric field of pin-plate fault model mainly concentrates on the needle point place of pin electrode 21, forms corona discharge; The floating potential fault model is responded to strong electric field around suspension electrode 25, and the highest with the needle point electric field, brings out corona discharge even puncture easily.
The job step of Medium Voltage Switchgear Partial Discharge Detection test platform provided by the utility model is as follows:
The fault model 8 of needs test is fixed on the stationary installation 7, can tests 3 set of fault models at most simultaneously.Can be by regulating conducting rod 6 and the matching thread change pin electrode 21 of stationary installation 7 and the spacing of plate electrode 22 for pin-plate fault model.According to Fig. 1, arrange ultrasonic probe 14 on square hole 16 or square hole 17, ultrahigh frequency probe 13 is placed near square hole 16 or the square hole 17, and TEV probe 15 sticks on the metal cabinet outer wall, Luo-coil 11 is looped around on the ground connection conducting rod 6 (b), and high-voltage probe 4 is connected with insulator inlet wire post 2.
If test need to change ambient humidity, system's front opening humidifier 3 of not switching on increases humidity, stops to read after 3 minutes the reading of two Hygrothermographs 5; Open the channel of digital oscilloscope of each sensor; Inlet wire post 2 is inserted in the power frequency high voltage source, the regulation voltage amplitude, each sensor carries out the local discharge signal information acquisition.
Claims (3)
1. a Medium Voltage Switchgear Partial Discharge Detection test platform is characterized in that: comprise metal cabinet, fault model, conducting rod, detecting signal unit and power frequency high voltage source;
Described metal cabinet left and right side has a plurality of square holes, and right side square hole area is the twice of left side square hole area, and the square hole top is coated with the magnetic baffle plate; The inside of metal cabinet is provided with small-sized humidifier, inwall Hygrothermograph respectively is installed up and down;
Described fault model comprises model and stationary installation, and stationary installation is made up of the upper and lower screw rod quick chuck of symmetry, and model is pin-plate fault model, insulation void collapse model and floating potential fault model, is fixed between the upper and lower screw rod quick chuck;
Described conducting rod has three and be symmetrically distributed and erect in described metal cabinet, every is made of upper and lower conducting rod, the upper end of last conducting rod pass metal cabinet top and connect the insulator binding post, the lower end is connected with the last screw rod quick chuck of the stationary installation of fault model, following screw rod quick chuck, lower end that the upper end of following conducting rod connects the stationary installation of fault model are connected with the metal cabinet;
Described detecting signal unit comprises ultrasonic sensor, uhf sensor, TEV sensor, Luo-coil, high-voltage probe and the one the second digital oscilloscopes, ultrasonic sensor is arranged near the square hole of metal cabinet left and right side, is connected with first digital oscilloscope by the shielding coaxial cable; Uhf sensor is arranged near the square hole of metal cabinet left and right side, is connected with second digital oscilloscope by the shielding coaxial cable; The TEV sensor sticks on the metal cabinet outside surface, is connected with second digital oscilloscope by the shielding coaxial cable; Luo-coil is looped around on the conducting rod of lower end, is connected with first digital oscilloscope by the shielding coaxial cable; High-voltage probe is located on the high pressure inlet wire of insulator binding post, is connected with first digital oscilloscope by the shielding coaxial cable;
The insulator binding post is inserted in described power frequency high voltage source.
2. Medium Voltage Switchgear Partial Discharge Detection test platform according to claim 1, it is characterized in that: the pin electrode length 50mm of described pin-plate fault model, needle point curvature are 30 microns, plate electrode diameter 100mm, pin electrode and plate electrode are separately fixed at the upper and lower screw rod quick chuck part of described stationary installation, and spacing is adjustable;
Described insulation void collapse model is bonded by the upper/lower electrode of symmetry, the poly (methyl methacrylate) plate up and down of symmetry and the space up and down of symmetry, electrode diameter 16mm, and length 60mm, two ends are semisphere, surface finish; Organic glass board diameter 100mm, thickness in monolayer 30mm; Electrode embeds in the poly (methyl methacrylate) plate, and the fixed distance in top and cylindrical space is 2mm;
Described floating potential fault model comprises two cylindrical electrodes, plexiglass block and suspension pin electrode; Described cylindrical electrode two ends are semisphere, embed the 10mm degree of depth in the plexiglass block, and both closely cooperate; Described plexiglass block upper surface has a diameter 1mm, the aperture of degree of depth 20mm every 90 ° around cylindrical electrode; The bee-line of described aperture and cylindrical surface is respectively 1mm, 1.5mm, 2mm, 2.5mm; Pin electrode is placed on any one in aforementioned 4 apertures.
3. Medium Voltage Switchgear Partial Discharge Detection test platform according to claim 1 and 2, it is characterized in that: described metal cabinet is located on the brace table, and brace table comprises table top and 4 support columns, and the support column bottom is equipped with lockable pulley, is convenient to mobile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320061895 CN203232129U (en) | 2013-02-01 | 2013-02-01 | Test platform for middle pressure switch cabinet partial discharge detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320061895 CN203232129U (en) | 2013-02-01 | 2013-02-01 | Test platform for middle pressure switch cabinet partial discharge detection |
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| CN203232129U true CN203232129U (en) | 2013-10-09 |
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| CN 201320061895 Withdrawn - After Issue CN203232129U (en) | 2013-02-01 | 2013-02-01 | Test platform for middle pressure switch cabinet partial discharge detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176110A (en) * | 2013-02-01 | 2013-06-26 | 广东电网公司电力科学研究院 | Partial discharge detection test platform of medium-voltage switch cabinet |
| CN111462599A (en) * | 2020-03-10 | 2020-07-28 | 合肥工业大学 | Gas discharge tube discharge experiment simulation device |
| CN114487686A (en) * | 2022-04-02 | 2022-05-13 | 济南博佳特物联科技有限公司 | Power-on detection equipment of low-voltage power distribution cabinet |
-
2013
- 2013-02-01 CN CN 201320061895 patent/CN203232129U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176110A (en) * | 2013-02-01 | 2013-06-26 | 广东电网公司电力科学研究院 | Partial discharge detection test platform of medium-voltage switch cabinet |
| CN103176110B (en) * | 2013-02-01 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | A kind of partial discharge detection test platform of medium-voltage switch cabinet |
| CN111462599A (en) * | 2020-03-10 | 2020-07-28 | 合肥工业大学 | Gas discharge tube discharge experiment simulation device |
| CN114487686A (en) * | 2022-04-02 | 2022-05-13 | 济南博佳特物联科技有限公司 | Power-on detection equipment of low-voltage power distribution cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131009 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |