CN101915885B - Method for positioning intra-bundle short circuit of stator gelled coil - Google Patents
Method for positioning intra-bundle short circuit of stator gelled coil Download PDFInfo
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- CN101915885B CN101915885B CN2010102189927A CN201010218992A CN101915885B CN 101915885 B CN101915885 B CN 101915885B CN 2010102189927 A CN2010102189927 A CN 2010102189927A CN 201010218992 A CN201010218992 A CN 201010218992A CN 101915885 B CN101915885 B CN 101915885B
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention provides a method for positioning an intra-bundle short circuit of a stator gelled coil. The method is characterized by comprising the following steps of: 1, checking the short circuit of the stator gelled coil; and 2, performing intra-bundle short circuit point positioning of the stator gelled coil by using a GZD-400A cable failure positioning bridge produced by Shanghai Huidong Electric Equipment Co., Ltd. The method has the advantages that: the method is free from the interference of a power-frequency strong magnetic field; the positioning is simple and convenient; and the operation is easy.
Description
Technical field
The present invention relates to the method for testing of short dot between a kind of generator unit stator gelled coil thigh.
Background technology
Stator coil is the heart of generator, and the quality of stator coil directly influences the serviceable life of generator.During generator operation, if stator coil in have strand between the short circuit meeting make coil produce local overheating, even cause the generator operation fault.So, in the manufacture process of stator coil, need carry out short-circuit test between thigh, guarantee that each the root strand in each root coil does not all have short dot between thigh.
The product category of stator coil is a lot, and the used raw-material type of stator coil can be different.If conductive line surfaces has tiny burr, in process,, form short circuit phenomenon between thigh thereby cause the part to contact easily because of damage in insulation, produce short circuit between thigh.Each factory uses homemade short circuit detection instrument that short dot is positioned mostly at present, though this detection instrument can accurately be located short dot, deficiency is arranged also.Be exactly the detected signal of this detection instrument be power frequency, receive the interference of power frequency high-intensity magnetic field on every side easily.In the past, stamper's bit comparison in coil workshop was few, let the station of searching short dot get final product away from the mold pressing station.But along with the continuous increase of stator coil product category and production output, the coil die stamping station has increased many, the south in coil workshop stride with in stride the place that is difficult to find not disturbed by the power frequency high-intensity magnetic field, so, can't accurately locate.
Summary of the invention
The purpose of this invention is to provide a kind of method for positioning intra-bundle short circuit of stator gelled coil that not disturbed by the power frequency high-intensity magnetic field.
In order to achieve the above object, technical scheme of the present invention has provided a kind of method for positioning intra-bundle short circuit of stator gelled coil, it is characterized in that, step is:
Step 1, the short circuit of stator gelled coil school;
Step 2, utilize the GZD-400A cable fault location electric bridge of Shanghai Welldone Electrical Equipment Co., Ltd. to carry out the intra-bundle short circuit of stator gelled coil point location, step is:
Step 2.1, GZD-400A cable fault location electric bridge earth terminal reliably is connected to the on-the-spot grounding body in location; Measure the end that head end is connected on the failure cable core; Ground clamp reliably is connected with the steel band or the copper shield of failure cable core; Measure a terminal end that connects the relief cable core, the other end of failure cable core and relief cable core is through the short circuit of C type folder short-circuit line;
Step 2.2, the 220V AC power is connected on the two ends of failure cable core and relief cable core;
Step 2.3, the cell switch of GZD-400A cable fault location electric bridge is put " opening "; Rotation " zeroing " button makes the galvanometer nulling on the electric bridge of GZD-400A cable fault location, and after this cell switch is in time put " pass "; Before current stabilization, cell switch must be in the off-position;
Step 2.4, just select the suitable voltage scope according to the voltage of failure cable core;
Step 2.5, open " power switch ", power light is bright, " high voltage adjusting " button counterclockwise on earth, zero-bit starts, relay indicating light is bright;
Step 2.6, clockwise slowly rotation " high voltage adjusting " button are observed voltage table and reometer, surpass 10mA up to reometer; If electric current is unstable, can continue boosted voltage, keep a period of time; Form stable arc or conduction region, make the current stabilization of test process;
Step 2.7, " cell switch/sensitivity " button that turns clockwise increase a sensitivity by shelves, obvious deflection are arranged but inexcessive to galvanometer; Rotation " ‰ " index dial; Make the galvanometer nulling, improve sensitivity, needle deflection is got final product the minor adjustments of " ‰ " knob is responsive by shelves;
Step 2.8, write down this moment " ‰ " index dial reading P
1‰, P should be arranged
1≤500;
Step 2.9, fall voltage, close " power switch ", discharge, and confirm that through another people will measure head end and the terminal switch of measurement, repeating step 2.3 to 2.8 obtains another reading P
2, P should be arranged
1+ P
2=A, A is between 990 and 1010;
The position Lx of step 2.10, calculating trouble spot, Lx=L * P
1‰, wherein Lx is the distance of trouble spot apart from failure cable core end, and L is the length of failure cable core.
The invention has the advantages that not disturbed by the power frequency high-intensity magnetic field, and the location is simple, convenient easy operating.
Description of drawings
Fig. 1 is the wiring schematic diagram of a kind of method for positioning intra-bundle short circuit of stator gelled coil provided by the invention.
Embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
The invention provides a kind of method for positioning intra-bundle short circuit of stator gelled coil, the steps include:
Step 1, the short circuit of stator gelled coil school;
The short circuit of stator gelled coil school can have several different methods; Such as pressing the QOA626F110 method that adopts; Instrument and equipment adopts short circuit measuring instrument between 300V/AC (50Hz) strand; Or adopt among the QOA626F130 " HMP (SVPI) stator insulation test specification " short-circuit test method between 4.1 strands, use DC 250V megohmmeter to test the insulation resistance between adjacent strand.Then adopt the bulb method in the present embodiment, stator gelled coil is connected connects the 220V power supply behind the bulb again, when moving according to stator gelled coil between the thigh of needs resistance select the resistance of bulb.
A bulb can be used for judging whether short circuit during bright degree when its 25% rated power, and reduce to 10% when following when power, and bulb has been red basically.When so we can move according to coil needs the thigh between resistance value design satisfactory bulb method, as the criterion of short-circuit test.For example requiring short-circuit resistances as 1,000,000 grades of stator coils is 10K, and just can adopt resistance is that bulb about 5K (about 10W) is tested, and needs only glow and just is judged to be short circuit.
Can prove according to above-mentioned test equally and adopt the reduction voltage method to test short circuit, the sensitivity of school short circuit bulb method has also just reduced.For example adopt 36V voltage, bulb adopts the 36V/15W bulb, and its resistance is 86.4 Ω, has only about short dot resistance is less than 260 Ω and just can test, if the short dot resistance ratio is bigger, bulb power is less than 6% of its rated resistance, and bulb has not worked.
Step 2, utilize the GZD-400A cable fault location electric bridge of Shanghai Welldone Electrical Equipment Co., Ltd. to carry out the intra-bundle short circuit of stator gelled coil point location, step is:
1) use multimeter, megger or other pressure-resistant equipment are confirmed the cable breakdown state, write down the insulation against ground resistance of each core or puncture numerical value such as residual voltage.
2) parameters such as record cable under test length, model, cross section are maked an inspection tour along cable run, at far-end short trouble cable and relief cable outlet terminal, stay a people to guard at far-end, in order to avoid high pressure is hurted sb.'s feelings.
3) by method wiring shown in Figure 1.The instrument ground end reliably is connected to the on-the-spot grounding body in location, is ground rod in the present embodiment.Measure the end that head end 1 is connected on failure cable core AB, ground clamp 2 links to each other with the instrument ground end, should reliably be connected with tested cable steel band (or copper shield), measures the end that end 2 meets relief cable core CD.The other end of failure cable core AB and relief cable core CD is through 3 short circuits of C type folder short-circuit line.Built-in high-voltage power supply output "-" polarity high pressure, the passing ratio potentiometer through two measurement cables, is added on failure cable core AB and the relief cable core CD, flows through breakdown point, flows into the instrument ground end through steel band and metal crocodile clip.It is thus clear that it is very important that metal crocodile clip and steel band (or copper shield) reliably link to each other, otherwise do not have current return, can't locate.
4) power supply is connected on AC220V, the 220V AC power is connected on the two ends of failure cable core AB and relief cable core CD.The supply socket earth point is unsettled in the instrument, therefore, does not require the power lead reliable ground.
5) electric bridge zeroing.Cell switch is put " opening ", rotation " zeroing " button, (if pointer is taken back, turn clockwise, pointer takes over, and is rotated counterclockwise).Make the galvanometer nulling.After this cell switch is in time put " pass ".The affirmation cell switch is put " pass "! When the off-position, not only close the galvanometer amplifier battery, the ratio of short circuit simultaneously potentiometer breaks off galvanometer.The pulse current of arc stage of can avoiding boosting damages electric bridge.Therefore, before current stabilization, cell switch must be in the off-position.
6) select the suitable voltage scope.For the low-voltage cable, choosing " 5kV " shelves can prevent that maloperation from making overtension.
7) boost.Open " power switch ", power light is bright." high voltage adjusting " button counterclockwise on earth, zero-bit starts, relay indicating light is bright.
8) slowly rotate " high voltage adjusting " button clockwise, observe voltage table and reometer, surpass 10mA up to reometer.If electric current is unstable, can continue boosted voltage, keep a period of time, form stable arc or conduction region, make the current stabilization of test process.
9) balance adjustment." cell switch/sensitivity " button that turns clockwise increases a sensitivity by shelves, obvious deflection is arranged but inexcessive to galvanometer, and rotation " ‰ " index dial makes galvanometer nulling (if pointer is taken back, turn clockwise, pointer takes over, and is rotated counterclockwise).Improve sensitivity by shelves, needle deflection is got final product the minor adjustments of " ‰ " knob is responsive.
10) write down the reading P of " ‰ " index dial at this moment
1‰, P should be arranged
1≤500.
11) fall voltage, close " power switch ", discharge, and through another people's affirmation.With the measuring pliers switch.Repeating step 4 to 10 obtains another reading P
2, P should be arranged
1+ P
2=1000.The mistake that this process can avoid reading and measuring pliers to use, P
1+ P
2Needn't pursue and be equal to 1000.Between 990 and 1010, all belong to normal.Close a floodgate at high pressure, no current output, current sensitivity shelves repeat zeroing can obtain ratio more accurately.
12) the position Lx=2 * L * P of calculating trouble spot
1‰, wherein Lx is the distance of trouble spot apart from failure cable core AB end, and L is the length of failure cable core AB.Should be specifically noted that " 2 " in the formula, because relief cable has made the cable extension that participate in to calculate one times.For short dot orientation distance between the stator coil thigh be: Lx=P
1‰ * L.
Claims (2)
1. a method for positioning intra-bundle short circuit of stator gelled coil is characterized in that, step is:
The whether short circuit of step 1, verification stator gelled coil;
Step 2, utilize the GZD-400A cable fault location electric bridge of Shanghai Welldone Electrical Equipment Co., Ltd. to carry out the intra-bundle short circuit of stator gelled coil point location, step is:
Step 2.1, GZD-400A cable fault location electric bridge earth terminal reliably is connected to the on-the-spot grounding body in location; Measure the end that head end (1) is connected on failure cable core (AB); Ground clamp (2) reliably is connected with the steel band or the copper shield of failure cable core (AB); Measure the end that terminal (4) connect relief cable core (CD), failure cable core (AB) presss from both sides short-circuit line (3) short circuit with the other end of relief cable core (CD) through the C type;
Step 2.2, the 220V AC power is connected on the two ends of failure cable core (AB) and relief cable core (CD);
Step 2.3, the cell switch of GZD-400A cable fault location electric bridge is put " opening "; Rotation " zeroing " button makes the galvanometer nulling on the electric bridge of GZD-400A cable fault location, and after this cell switch is in time put " pass "; Before current stabilization, cell switch must be in the off-position;
Step 2.4, just select the suitable voltage scope according to the voltage of failure cable core (AB);
Step 2.5, open " power switch ", power light is bright, " high voltage adjusting " button counterclockwise on earth, zero-bit starts, relay indicating light is bright;
Step 2.6, clockwise slowly rotation " high voltage adjusting " button are observed voltage table and reometer, surpass 10mA up to reometer; If electric current is unstable, can continue boosted voltage, keep a period of time; Form stable arc or conduction region, make the current stabilization of test process;
Step 2.7, " cell switch/sensitivity " button that turns clockwise increase a sensitivity by shelves, obvious deflection are arranged but inexcessive to galvanometer; Rotation " ‰ " index dial; Make the galvanometer nulling, improve sensitivity, needle deflection is got final product the minor adjustments of " ‰ " knob is responsive by shelves;
Step 2.8, write down this moment " ‰ " index dial reading P
1‰, P should be arranged
1≤500;
Step 2.9, fall voltage, close " power switch ", discharge, and confirm that through another people will measure head end (1) and measure end (4) switch, repeating step 2.3 to 2.8 obtains another reading P
2, P should be arranged
1+ P
2=A, A is between 990 and 1010;
The position Lx of step 2.10, calculating trouble spot, Lx=L * P
1‰, wherein Lx is the distance of trouble spot apart from failure cable core (AB) end, and L is the length of failure cable core (AB).
2. a kind of method for positioning intra-bundle short circuit of stator gelled coil as claimed in claim 1; It is characterized in that; The bulb method is adopted in the short circuit of the school of stator gelled coil described in the step 1; Its step connects the 220V power supply for stator gelled coil is connected behind the bulb again, when move according to stator gelled coil needs strand between resistance select the resistance of bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102189927A CN101915885B (en) | 2010-06-30 | 2010-06-30 | Method for positioning intra-bundle short circuit of stator gelled coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102189927A CN101915885B (en) | 2010-06-30 | 2010-06-30 | Method for positioning intra-bundle short circuit of stator gelled coil |
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|---|---|
| CN101915885A CN101915885A (en) | 2010-12-15 |
| CN101915885B true CN101915885B (en) | 2012-07-25 |
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|---|---|---|---|
| CN2010102189927A Active CN101915885B (en) | 2010-06-30 | 2010-06-30 | Method for positioning intra-bundle short circuit of stator gelled coil |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707189A (en) * | 2012-05-31 | 2012-10-03 | 卧龙电气集团股份有限公司 | Method for determining short-circuit position of parallel-wound wires of transformer coil |
| CN103076528B (en) * | 2012-12-27 | 2015-11-11 | 中航(苏州)雷达与电子技术有限公司 | Breakover point of insulation resistance of bifilar parallel wound coil method for rapidly positioning |
| CN103293413B (en) * | 2013-05-19 | 2016-07-06 | 国家电网公司 | A kind of transformer test high pressure special purpose device |
| CN103713231B (en) * | 2013-12-26 | 2016-06-01 | 天津经纬电材股份有限公司 | Multiply combination transposed winding conducting wire integrated short dot detector |
| CN109613387B (en) * | 2018-11-22 | 2021-05-25 | 广西电网有限责任公司电力科学研究院 | Winding intertwist short circuit simulator |
| CN110086533A (en) * | 2019-06-13 | 2019-08-02 | 江苏亨通海洋光网系统有限公司 | A kind of long length has the insulation fault location method of relaying submarine optical fiber cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1164633A1 (en) * | 1983-01-06 | 1985-06-30 | Предприятие П/Я Р-6266 | Transducer for detecting short-circuit turns in stator windings of electric machines |
| CN86200310U (en) * | 1986-01-24 | 1986-12-17 | 单觉初 | Universal detector for detecting the trouble existed between turns of winding of small and medium-sized motor |
| CN2035097U (en) * | 1988-05-23 | 1989-03-29 | 哈尔滨工业大学 | Cable short-circuit position tester |
| CN1540360A (en) * | 2003-04-24 | 2004-10-27 | 新疆特变电工股份有限公司 | Test method for postioning fault point of low resistivity in cable |
| CN101710162A (en) * | 2009-11-27 | 2010-05-19 | 华北电力大学（保定） | Motor rotor winding interturn short-circuit failure diagnosing method based on stator iron core vibration |
-
2010
- 2010-06-30 CN CN2010102189927A patent/CN101915885B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1164633A1 (en) * | 1983-01-06 | 1985-06-30 | Предприятие П/Я Р-6266 | Transducer for detecting short-circuit turns in stator windings of electric machines |
| CN86200310U (en) * | 1986-01-24 | 1986-12-17 | 单觉初 | Universal detector for detecting the trouble existed between turns of winding of small and medium-sized motor |
| CN2035097U (en) * | 1988-05-23 | 1989-03-29 | 哈尔滨工业大学 | Cable short-circuit position tester |
| CN1540360A (en) * | 2003-04-24 | 2004-10-27 | 新疆特变电工股份有限公司 | Test method for postioning fault point of low resistivity in cable |
| CN101710162A (en) * | 2009-11-27 | 2010-05-19 | 华北电力大学（保定） | Motor rotor winding interturn short-circuit failure diagnosing method based on stator iron core vibration |
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|---|---|
| CN101915885A (en) | 2010-12-15 |
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