CN213240384U - Device for measuring insulation of end part of generator stator winding - Google Patents
Device for measuring insulation of end part of generator stator winding Download PDFInfo
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- CN213240384U CN213240384U CN202021668234.0U CN202021668234U CN213240384U CN 213240384 U CN213240384 U CN 213240384U CN 202021668234 U CN202021668234 U CN 202021668234U CN 213240384 U CN213240384 U CN 213240384U
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- 239000011810 insulating material Substances 0.000 description 2
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a measure insulating device of generator stator winding end, including hollow measuring stick, its one end is provided with the measuring probe of flexible conductive rubber material, insulating handle is connected to the other end, inside sets up current-limiting resistor and piezo-resistor, connect ampere meter and voltmeter respectively through the measurement jack on the measuring stick, during the measurement, measuring probe and insulating surface contact, show through ampere meter and voltmeter, thereby measure the electric current and the voltage of insulating defect point, the step of the cellophane cladding has been cancelled, adopt measuring probe to detect narrow and small space simultaneously, realize the comprehensive detection at insulating position, the security of generator operation is improved.
Description
Technical Field
The utility model relates to an electric power detection field specifically is a measure insulating device of generator stator winding tip.
Background
At present, the straight line part of a metal wire bar of a stator winding of a large-scale thermal and hydroelectric generator adopts a hot-press molding system for insulation, so that the reliability is higher, the insulation of the metal wire bar at the end part is finished by adopting an insulating tape of epoxy mica tape soaked in epoxy resin adhesive and manually wrapping the insulating tape in multiple layers, and the problem of partial discharge in air bubbles is caused due to the fact that the manual wrapping insulation is not tight, the compaction of the insulating tape is not uniform, and air bubbles are easily formed between the insulating layers; the method is characterized in that a generator insulating material, particularly an end part of the generator insulating material can be subjected to the effects of vibration, electromagnetic force, chemical corrosion and high temperature during operation, and cracks or invisible cracks are easy to appear.
But the thin soft breakable tin foil paper of hardly making makes the tin foil paper laminate completely on insulating surface, can't wrap up the tin paper by hand at the narrow and small position in some insulation space, thereby can't detect insulating surface voltage and leakage current and lead to producing the measurement blind area, need all clean up the tin paper piece that drops on generator stator coil when measuring finishing, it takes a lot of work and time, in case do not find those remaining tin paper pieces, they flow along with cooling air, the card can reduce insulating strength on generator stator alternate line stick surface, if get into the rotor ventilation hole and can lead to generator rotor winding ground connection or short circuit and cause the accident, threaten generator safety.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a need not wrap up measuring device of tin foil, the purpose improves the insulating defect relevance rate, avoids adopting safe risk, saving cost reduction intensity of labour that the adoption tin foil caused the generator.
The utility model discloses a realize through following technical scheme:
a device for measuring the insulation of the end part of a generator stator winding comprises a measuring probe, a current-limiting resistor, a measuring rod, a piezoresistor and an insulation handle;
the measuring rod is of a hollow structure, the measuring probe is installed at one end of the measuring rod, the insulating handle is located at the other end of the measuring rod, the current-limiting resistor and the piezoresistor are arranged inside the measuring rod, one end of the current-limiting resistor is connected with the measuring probe, the other end of the current-limiting resistor is connected with the ammeter, one end of the piezoresistor is connected with the measuring probe and the voltmeter, and the other end of the piezoresistor is grounded.
Preferably, the measuring rod is provided with a current testing jack, a voltage testing jack and a grounding jack, the current meter and the voltmeter are respectively inserted into the current testing jack and the voltage testing jack, and the grounding jack is grounded.
Preferably, one end of the piezoresistor is connected with the voltage testing jack, the other end of the piezoresistor is connected with the grounding plug, and the voltage testing jack is connected with the measuring probe.
Preferably, the current test jack, the voltage test jack and the grounding jack are all arranged on the hollow epoxy resin measuring rod.
Preferably, the current limiting resistor comprises a plurality of metal film resistors connected in series.
Preferably, the piezoresistor is composed of a plurality of resistors connected in series.
Preferably, the measuring probe is made of conductive rubber.
Preferably, the measuring probe is of a triangular structure, one side of the measuring probe is connected with the measuring rod, and the side, the vertex and the whole surface of the triangle are all working measuring parts.
Preferably, one end of the insulated handle close to the measuring probe is provided with a hand baffle.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a pair of measure insulating device of generator stator winding end, including the measuring stick, its tip is provided with the measuring probe of conductive rubber material, utilize conductive rubber's softness, be rich in elasticity, electrically conductive characteristics, realize the reliable contact with generator insulation surface, because measuring probe designs into triangle-shaped, utilize triangle-shaped's angle, the side, the surface area, can realize the point with generator insulation surface, the line, surface contact, the realization detects the narrow and small space of unable parcel tinfoil, play the efficiency at comprehensive detection no dead angle, lead-in leakage current to the ampere meter through inside current-limiting resistance, lead-in insulation surface potential to the voltmeter through high tension cable, thereby the leakage current and the surface voltage of measuring insulation surface have cancelled the step of tinfoil cladding.
Drawings
FIG. 1 is a schematic structural diagram of the device of the present invention;
fig. 2 is a schematic diagram of the device of the present invention.
In the figure: 1. a measuring probe; 2. a current limiting resistor; 3. a measuring rod; 4. a lead wire; 5. a high voltage cable; 6. a current test jack; 7. a voltage test jack; 8. a ground jack; 9. a hand guard; 10. an insulated handle; 11. an ammeter; 12. a voltmeter; 13. a ground wire; 14. a voltage dependent resistor.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.
Referring to fig. 1 and 2, the device for measuring the insulation of the end part of the stator winding of the generator comprises a measuring probe 1, a current limiting resistor 2, a measuring rod 3, a piezoresistor 14 and an insulation handle 10.
The measuring rod is of a hollow structure, the measuring probe is arranged at the end part of the measuring rod, the insulating handle 10 is positioned at the other end of the measuring rod 3, and the current-limiting resistor 2 and the piezoresistor 14 are arranged inside the measuring rod;
the current limiting resistor 2 is connected with an ammeter through a lead 4, and the piezoresistor 14 is connected with the measuring probe 1 through a high-voltage cable 5.
The measuring probe 1 is of a triangular structure made of conductive rubber, the conductive rubber is arranged at the end part of the measuring rod due to good elasticity and flexibility, the conductive rubber deforms under pressure to be well attached to the insulating surface, and meanwhile, the triangular corners, edges and surface areas of the conductive rubber are utilized to realize point, line, surface and contact with the insulating surface, so that the conductive rubber can be reliably contacted with the insulating surface in various shapes, and the defect of wrapping tin foil paper in the technical background is overcome.
The current-limiting resistor is 100 MOmega, is formed by connecting 5 metal film resistors with the resistance value of 20 MOmega and the power of 2W in series, and aims to prolong the length of the current-limiting resistor body so as to ensure the capability of bearing 4000V voltage at two ends of the resistor.
The measuring rod 3 is provided with a current testing jack 6, one end of the current limiting resistor is connected with the measuring probe 1, the other end of the current limiting resistor is connected with the testing jack 6, the ammeter is inserted in the testing jack 6, and the measuring rod 3 is made of a hollow epoxy resin rod 3 with the diameter of 50 mm.
The ammeter 11 is a microampere ammeter, and adopts a digital ammeter with a measurement range of 0 to 100uA for measuring the leakage current of the insulating surface.
The measuring rod 3 is also provided with a voltage testing jack 7 and a grounding jack 8, the voltage testing jack 7 is connected with the measuring probe through a high-voltage cable 5, a piezoresistor 14 is connected between the voltage testing jack 7 and the grounding jack 8, the grounding jack 8 is grounded through a ground wire 13, and the other ends of the piezoresistor 14, the ammeter 11 and the voltmeter 12 are reliably grounded.
The voltage dependent resistor 14 is formed by connecting 3 resistors in series, the operating voltage of the voltage dependent resistor is 1000V, and the model is MY31 in series.
The high-voltage cable 5 is a silicon rubber insulated high-voltage cable with the electric strength of 30KV and the diameter of 12 mm.
The voltmeter is a kilovolt meter 12, the kilovolt meter 12 is a high input impedance voltmeter, the input impedance of the voltmeter is not less than 10M omega, the measurement range is 0-3000V, and the voltmeter can be a digital voltmeter or a vacuum tube voltmeter.
One end of the insulated handle 10 close to the measuring probe is provided with a hand baffle 9 for ensuring that the hands of the tester can not contact the places except the insulated handle, thereby ensuring the safety.
The current limiting resistor 2, the high-voltage cable 5 and the piezoresistor 14 are all arranged inside the hollow epoxy resin test rod.
The utility model discloses a measure insulating device of generator stator winding tip's working process as follows:
referring to fig. 2, YS in the drawing indicates a generator stator coil water conduit, SB indicates generator end hand-wrapping insulation, and AT, BT and CT indicate three-phase generator outlet bushings.
If the end winding of the generator stator has a defect point, the potential is abnormally increased or the leakage current is abnormally increased at the point, when the conductive rubber probe 1 contacts the point, the leakage current is led into the microammeter through the current limiting resistor 2, the size of the leakage current of the insulation fault point is measured, and the surface potential of the insulation defect point is measured by connecting the conductive rubber probe to the kilovolt ammeter 12 through the high-voltage cable 5.
According to the requirements of DL/T596-1996 electric power preventive test regulation, the potential of the insulation surface of the end winding of the generator stator when grounded through a 100M omega resistor should not be greater than 3000V, and the surface leakage current should not be greater than 30 uA.
The piezoresistor is connected with the conductive rubber through a high-voltage cable in the measuring rod, and the other end of the piezoresistor is grounded through the test jack 8, so that the voltage of the piezoresistor to the ground of the measuring probe is limited to be below 4000V, the ammeter 11 and the kilovolt meter 12 are prevented from being damaged by overvoltage, the personal safety of testers is guaranteed, and particularly, if the insulation is broken down in the measuring process, the piezoresistor can be effectively protected once.
The utility model provides a pair of measure generator stator winding end insulation surface potential and leakage current's device, including the measuring stick, its tip is provided with the measuring probe that conductive rubber material made, and measuring probe is through the contact with generator stator insulation surface, and it is leading-in to microampere meter 11 with insulation surface leakage current through current-limiting resistance 2, and the potential conduction of insulation surface to voltmeter 12 shows through the inside high tension cable 5 of measuring stick, has realized measuring insulation surface's potential and leakage current. The method has the advantages that the step of wrapping the insulating surface with the tinfoil bag is omitted, the measuring time is greatly shortened, the working strength is reduced, the test cost is reduced, the problem that accidents are caused by grounding or short circuit of a generator rotor winding due to the fact that the tinfoil is not cleaned completely when the tinfoil needs to be wrapped in the previous measuring method and the residual tinfoil scraps enter a generator rotor ventilation hole along with cooling hydrogen flow is avoided, secondly, the maximum voltage applied to a meter is limited by a piezoresistor to be not more than 4000V, the safety of operators during insulation breakdown in the testing process is guaranteed, finally, a measuring probe is made of conductive rubber, the flexible deformation characteristic is achieved, the narrow space can be detected, comprehensive detection of an insulating part is achieved, and the safety of operation of a generator is improved.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (9)
1. A device for measuring the insulation of the end part of a generator stator winding is characterized by comprising a measuring probe (1), a current-limiting resistor (2), a measuring rod (3), a piezoresistor (14) and an insulating handle (10);
the measuring rod is of a hollow structure, the measuring probe (1) is installed at one end of the measuring rod, the insulating handle (10) is located at the other end of the measuring rod (3), the current-limiting resistor (2) and the piezoresistor (14) are arranged inside the measuring rod, one end of the current-limiting resistor (2) is connected with the measuring probe, the other end of the current-limiting resistor is connected with the ammeter, one end of the piezoresistor (14) is connected with the measuring probe and the voltmeter, and the other end of the piezoresistor is grounded.
2. The device for measuring the insulation of the end part of the stator winding of the generator as claimed in claim 1, wherein the measuring rod is provided with a current testing jack (6), a voltage testing jack (7) and a grounding jack (8), the current meter and the voltage meter are respectively inserted into the current testing jack (6) and the voltage testing jack (7), and the grounding jack (8) is grounded.
3. A device for measuring the insulation of the end of a stator winding of a generator according to claim 2, characterized in that the piezoresistor (14) is connected at both ends with a voltage test jack (7) and a grounding plug, respectively, the voltage test jack (7) being connected with a measuring probe.
4. Device for measuring the insulation of the end of a winding of a generator stator according to claim 2, characterized in that the current test socket (6), the voltage test socket (7) and the grounding socket (8) are all arranged on the hollow epoxy measuring rod (3).
5. The apparatus of claim 1, wherein the current limiting resistor comprises a plurality of metal film resistors connected in series.
6. The apparatus of claim 1 wherein the varistor is comprised of a plurality of resistors connected in series.
7. The apparatus of claim 1, wherein the measuring probe is made of conductive rubber.
8. The apparatus of claim 7, wherein the measuring probe has a triangular cross-section and one side of the measuring probe is connected to the measuring rod.
9. Device for measuring the insulation of the end of a winding of a stator of an electric generator according to claim 1, characterized in that the end of the insulated handle (10) close to the measuring probe is provided with a finger guard (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021668234.0U CN213240384U (en) | 2020-08-11 | 2020-08-11 | Device for measuring insulation of end part of generator stator winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021668234.0U CN213240384U (en) | 2020-08-11 | 2020-08-11 | Device for measuring insulation of end part of generator stator winding |
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| Publication Number | Publication Date |
|---|---|
| CN213240384U true CN213240384U (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021668234.0U Active CN213240384U (en) | 2020-08-11 | 2020-08-11 | Device for measuring insulation of end part of generator stator winding |
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| Country | Link |
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| CN (1) | CN213240384U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085127A (en) * | 2022-07-29 | 2022-09-20 | 福建永福电力设计股份有限公司 | Novel binding material for line post insulator and insulated wire |
-
2020
- 2020-08-11 CN CN202021668234.0U patent/CN213240384U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085127A (en) * | 2022-07-29 | 2022-09-20 | 福建永福电力设计股份有限公司 | Novel binding material for line post insulator and insulated wire |
| CN115085127B (en) * | 2022-07-29 | 2023-04-14 | 福建永福电力设计股份有限公司 | Binding material for line post insulator and insulated wire |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 714206 8th floor, block B, Xi'an Hongxiang building, No. 90, Xingqing Road, Beilin District, Xi'an City, Shaanxi Province Patentee after: Datang Qinling Power Generation Co.,Ltd. Address before: 714206 Luofu Industrial Park, Huayin City, Weinan City, Shaanxi Province Patentee before: HUANENG SHAANXI QINLING POWER GENERATION CO.,LTD. |