CN112881807B - Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor - Google Patents
Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor Download PDFInfo
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- CN112881807B CN112881807B CN202110022283.XA CN202110022283A CN112881807B CN 112881807 B CN112881807 B CN 112881807B CN 202110022283 A CN202110022283 A CN 202110022283A CN 112881807 B CN112881807 B CN 112881807B
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 124
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 82
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000012937 correction Methods 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 abstract description 11
- 230000008439 repair process Effects 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
The application relates to a tool and a method for measuring the loop resistance and the carbon brush loop resistance of a generator rotor, wherein the measuring tool comprises an insulating protective cover, a voltage probe and a current probe. The application relates to a method for measuring the resistance of a generator rotor loop, which comprises the following steps: the resistance of the generator rotor loop is measured using a microohm resistance measuring instrument. The carbon brush loop resistance measuring method of the application comprises the following steps: measuring the resistance between two adjacent carbon brush collecting rings as a correction resistance for correcting a measurement result; measuring the sum of the carbon brush loop resistance and the correction resistance; and subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain the carbon brush loop resistance value. The measuring tool for the loop resistance and the carbon brush loop resistance of the generator rotor can realize that the current of a microohm resistance measuring instrument forms a loop in the rotor and the voltage of the voltage drop of the rotor loop is picked up correctly. The application can conveniently and rapidly realize the resistance measurement of the generator rotor loop and the carbon brush loop.
Description
Technical Field
The application relates to the field of electricity, in particular to a tool and a method for measuring loop resistance and carbon brush loop resistance of a generator rotor.
Technical Field
The measurement of the resistance of the rotor loop of the generator can judge the health state of the rotor loop, and particularly can accurately judge the degradation trend of the resistance of the rotor loop of the generator by comparing with historical data, comprising the following steps: the contact resistance of each contact surface varies, for example: the problems of good contact of the conductive screw, turn-to-turn short circuit and the like can be judged by the change of the contact resistance of the conductive screw and the direct current resistance of the rotor winding. The Power Equipment preventive test protocol (DL/T596-2005) requires: the period of measurement of the dc resistance of the rotor windings is "at overhaul" and typically differs by no more than 2% from the initial (cross-over or overhaul) measurement. The general overhaul period of the generator is 5-6 years, and it is obvious that the rotor loop resistance is measured 5-6 times in the whole life period of the generator for 30 years according to the measurement period, most of the time is in a tube-off state, the overlong measurement period and the discrete measurement data of each time are too long, and even if the comparison data are not more than 2%, the degradation trend cannot be judged correctly. For example, in 10 months and 31 days 2009, after a certain power plant is overhauled, the unit is started to loosen the conductive screw of the outgoing line of the rotor loop of the generator, so that the contact resistance is increased, and the heating and burning loss events are caused. The company strictly performs the measurement work of the rotor loop resistance according to the requirements of the electrical equipment preventive test procedure (DL/T5962005), 3 times of overhaul records are shared in 2009, the ratio of the rotor loop resistance measurement result to the factory during the overhaul in 2007 is 1.2%, the jump of the other two times of measurement data occurs, the discrete type is large, the measurement data is too few and has no rule, and the deterioration trend is not judged. The actual situation is: although not exceeding 2% of standard requirements, there has been a growing trend that has not received enough attention, resulting in 110 ten thousand yuan of tragic training of direct economic loss of rotor return to service repair once because of increased contact resistance and burnout of the conductive screws. After that, the group company issues specially "measures for preventing the conductive bolts of the generator rotor winding from burning your anti-accident" in this regard, which requires: the unit is overhauled, the direct current resistance of the generator rotor winding is measured, and the mutual difference between the direct current resistance and the measured data in the past is converted to the same temperature and cannot be more than 2 percent, and the cause is to be found out by more than 1 percent. In practice, it is technically difficult to measure the resistance of the generator rotor circuit during minor repairs, which is why the electrical equipment preventive test procedure (DL/T5962005) does not require a measure during minor repairs.
The method for measuring the resistance of the rotor loop of the generator is generally as follows: when the rotor is overhauled, after the rotor is pulled out, annealed copper wires are wound on the positive electrode collector ring and the negative electrode collector ring, and the force and the method for winding the annealed copper wires are used as measuring terminals connected with a measuring instrument, so that different contact resistances can be generated, the contact resistances can be counted in the rotor loop resistance, and have great influence on the test result, so that the discrete test result is easy to appear, namely, the simple one-time test data is not more than 2%, and the analysis of the degradation trend is not practical. What is the technical difficulty of measuring rotor loop resistance during minor repairs? Because the rotor is not drawn during minor repair, and the brush holder and the excitation bus of the rotor are not removed, annealed copper wires cannot be wound, and even if the force is not enough to be wound, a large contact resistance exists, the measured data has no statistical significance, and the measured data is completely garbage data. Therefore, the current contradiction is how to solve the problem of how to reliably connect the measuring instrument with the collecting ring during the maintenance.
The carbon brush is the only current path between the collecting ring of the generator rotor loop and the exciting loop, and the current of thousands of amperes is connected with the collecting ring through the carbon brush, so that the rotor is excited through the rotor winding. The ignition and the uneven current distribution in the carbon brush operation are common problems in the operation and are also serious threatens to the operation of the generator. When such problems generally occur, maintenance personnel can adjust the carbon brush pressure and replace the carbon brush in a charged mode, and when the carbon brush is adjusted, the carbon brush is padded with insulating pads and wearing insulating gloves, but the charged operation always has safety risks. The important reasons for generating the pressure unevenness and the current distribution unevenness are differences of carbon brush loop resistances (comprising carbon brush lead resistances, carbon brush body resistances and carbon brush and collector ring contact resistances), the current regulation of carbon brush loop resistances is not explicitly required, and the main reasons for the non-requirements are that measuring tools, measuring methods and regulations for carbon brush loop resistances are not available in static state (in a stop state), and only the observation of the running state in running can be adopted for adjustment.
In reality, tools capable of conveniently measuring the loop resistance of the generator rotor and the loop resistance of the carbon brush and a corresponding measuring method are lacking.
Disclosure of Invention
The application aims to provide a tool and a method for measuring the loop resistance of a generator rotor and the loop resistance of a carbon brush, which are convenient to use.
The application relates to a measuring tool for loop resistance and carbon brush loop resistance of a generator rotor, which comprises an insulating protective cover, and a voltage probe and a current probe which extend out of the insulating protective cover.
The application relates to a measuring tool for loop resistance of a generator rotor and loop resistance of a carbon brush, wherein an insulating protective cover is cuboid, a voltage probe and a current probe extend out of the front end face of the insulating protective cover, and a voltage wiring terminal and a current wiring terminal are arranged below the bottom face of the insulating protective cover.
The application relates to a measuring tool for loop resistance and carbon brush loop resistance of a generator rotor, wherein a plurality of current probes are arranged, each current probe comprises a current needle head, an outer tube and a spring arranged between the current needle head and the outer tube, the current needle heads of the plurality of current probes are connected with a current bus bar, and the current bus bar is connected with a current wiring terminal, so that the current probes can stretch and retract along with the radian of the surface of a collecting ring, and good contact between the current probes and the collecting ring is ensured.
The application relates to a measuring tool for loop resistance and carbon brush loop resistance of a generator rotor, wherein a plurality of voltage probes are arranged, each voltage probe comprises a voltage needle head, an outer tube and a spring arranged between the voltage needle head and the outer tube, the voltage needle heads of the voltage probes are connected with a voltage bus, and the voltage bus is connected with a voltage wiring terminal, so that the voltage probes can stretch and retract along with the radian of the surface of a collecting ring, and good contact between the voltage probes and the collecting ring is ensured.
According to the measuring tool for the loop resistance of the generator rotor and the loop resistance of the carbon brush, the contact surfaces of the front ends of the voltage needle head and the current needle head are hemispherical, so that seamless contact with an arc-shaped collecting ring is ensured.
The application relates to a method for measuring the loop resistance of a generator rotor, which comprises the following steps of:
respectively detaching a carbon brush from a positive collecting ring and a negative collecting ring of the generator, respectively contacting a voltage probe and a current probe of a measuring tool with the positive collecting ring and the negative collecting ring at the position of the original carbon brush, and connecting a current wire of a microohm resistance measuring instrument to a current connecting terminal of the measuring tool to form a current loop; connecting a voltage line of the microohm resistance measuring instrument to a voltage wiring terminal of the measuring tool to form a voltage loop;
the resistance of the generator rotor loop is measured using a microohm resistance measuring instrument.
The carbon brush loop resistance measuring method of the application, utilizing the generator rotor loop resistance and carbon brush loop resistance measuring tool of the application, comprises:
the first step: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the positions of the original carbon brushes, respectively contacting voltage probes and current probes of the measuring tools with carbon brush collecting rings, respectively connecting current wires of a microohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage wires of the microohm resistance measuring instrument with the voltage connecting terminals of the two measuring tools, measuring the resistance between the two adjacent carbon brush collecting rings, and using the resistance as a correction resistance for correcting a measuring result;
and a second step of: reserving one measuring tool, removing the other measuring tool, installing an original carbon brush, connecting a current wire of a microohm resistance measuring instrument with a carbon brush lead and a current wiring terminal of the measuring tool respectively, connecting a voltage wire of the microohm resistance measuring instrument with a carbon brush lead and a voltage wiring terminal of the measuring tool respectively, and measuring the sum of a carbon brush loop resistance and a correction resistance;
and a third step of: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain a carbon brush loop resistance value;
fourth step: and repeating the first step, the second step and the third step, and measuring the resistance values of all carbon brush loops.
The measuring tool for the loop resistance and the carbon brush loop resistance of the generator rotor can ensure that a microohm resistance measuring instrument is reliably connected with a collector ring of the generator rotor loop, and realizes correct pickup of voltage of loop formed by current of the microohm resistance measuring instrument in the rotor and voltage drop of the rotor loop. According to the technical scheme, the resistance measurement of the generator rotor loop and the carbon brush loop can be conveniently and quickly realized.
Drawings
FIG. 1 is an exploded view of a schematic diagram of a measuring tool for the resistance of a generator rotor and the resistance of a carbon brush circuit according to the present application;
FIG. 2 is a perspective view of a schematic structural diagram of a tool for measuring the resistance of a generator rotor and the resistance of a carbon brush circuit according to the present application;
FIG. 3 is a schematic diagram of a method of measuring generator rotor loop resistance according to the present application;
FIG. 4 is a schematic diagram of a carbon brush loop resistor;
FIG. 5 is a schematic diagram of measuring the sum of the correction resistances in the carbon brush loop resistance measuring method according to the present application;
FIG. 6 is a schematic diagram illustrating a carbon brush loop resistance measurement method according to the present application;
fig. 7 is an exploded view of the schematic of the structure of the current needle.
Wherein:
1-an insulating protective cover; 2-voltage connection terminals; 3-a current connection terminal; 4-voltage probes; 5-current probe; 6-voltage buss; 7-a current bus; 10-a measuring tool for the loop resistance of a generator rotor and the loop resistance of a carbon brush; 301-rotor circuit; 302-positive collector ring; 303-negative slip ring; 401-carbon brush lead resistance; 402-carbon brush body resistance; 403-carbon brush contact resistance; 404-carbon brush loop resistance; 501-correcting resistance; 601-carbon brush lead wire; 701-current needle; 702-a spring; 703-outer tube.
Detailed Description
As shown in fig. 1, 2 and 7, the tool 10 for measuring the resistance of the rotor loop and the resistance of the carbon brush loop of the generator comprises an insulation protection cover 1, and a voltage probe 4 and a current probe 5 which extend out of the insulation protection cover, wherein the voltage probe 4 is connected with a voltage wiring terminal 2 through a voltage bus bar 6, the current probe 5 is connected with a current wiring terminal 3 through a current bus bar 7, the voltage bus bar and the current bus bar are both arranged in the insulation protection cover, and the voltage wiring terminal and the current wiring terminal are both arranged outside the insulation protection cover.
The application relates to a measuring tool for loop resistance of a generator rotor and loop resistance of a carbon brush, wherein an insulating protective cover is cuboid, a voltage probe and a current probe extend out of the front end face of the insulating protective cover, and a voltage wiring terminal and a current wiring terminal are arranged below the bottom face of the insulating protective cover.
The application relates to a measuring tool 10 for the loop resistance of a generator rotor and the loop resistance of a carbon brush, wherein a plurality of current probes are provided, each current probe comprises a current needle 701, an outer tube 703 and a spring 702 arranged between the current needle and the outer tube, the current needles of the plurality of current probes are connected with a current bus bar, and the current bus bar is connected with a current wiring terminal, so that the current probes can stretch and retract along the radian of the surface of a collecting ring, and the current probes are ensured to be in good contact with the collecting ring.
The voltage probe and the current probe have the same structure.
The application relates to a measuring tool 10 for loop resistance and carbon brush loop resistance of a generator rotor, wherein a plurality of voltage probes are provided, each voltage probe comprises a voltage needle head, an outer tube and a spring arranged between the voltage needle head and the outer tube, the voltage needle heads of the plurality of voltage probes are connected with a voltage bus, and the voltage bus is connected with a voltage wiring terminal, so that the voltage probes can stretch and retract along with the radian of the surface of a collecting ring, and good contact between the voltage probes and the collecting ring is ensured.
The measuring tool 10 for the loop resistance of the generator rotor and the loop resistance of the carbon brush ensures seamless contact with the arc-shaped collecting ring, wherein the contact surfaces of the front ends of the voltage needle head and the current needle head are hemispherical.
Referring to fig. 3, the method for measuring the resistance of the generator rotor circuit according to the present application, using the tool for measuring the resistance of the generator rotor circuit and the carbon brush circuit according to the present application, comprises:
a carbon brush is detached from a positive collecting ring 302 and a negative collecting ring 303 of the generator, a voltage probe and a current probe of a measuring tool are respectively contacted with the positive collecting ring and the negative collecting ring at the original carbon brush positions, and a current wire of a microohm resistance measuring instrument is connected to a current connecting terminal of the measuring tool to form a current loop; connecting a voltage line of the microohm resistance measuring instrument to a voltage wiring terminal of the measuring tool to form a voltage loop;
the resistance of the generator rotor loop is measured using a microohm resistance measuring instrument.
Referring to fig. 4 and 5, the carbon brush loop resistance measuring method according to the present application includes:
the first step: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the positions of the original carbon brushes, respectively contacting voltage probes and current probes of the measuring tools with carbon brush collecting rings, respectively connecting current wires of a microohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage wires of the microohm resistance measuring instrument with the voltage connecting terminals of the two measuring tools, measuring the resistance between the two adjacent carbon brush collecting rings, and using the resistance as a correction resistance for correcting a measuring result;
and a second step of: reserving one measuring tool, removing the other measuring tool, installing an original carbon brush, connecting a current wire of a microohm resistance measuring instrument with a carbon brush lead and a current wiring terminal of the measuring tool respectively, connecting a voltage wire of the microohm resistance measuring instrument with a carbon brush lead and a voltage wiring terminal of the measuring tool respectively, and measuring the sum of a carbon brush loop resistance and a correction resistance;
and a third step of: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain a carbon brush loop resistance value;
fourth step: and repeating the first step, the second step and the third step, and measuring the resistance values of all carbon brush loops.
The measuring tool for the loop resistance and the carbon brush loop resistance of the generator rotor can ensure that a microohm resistance measuring instrument is reliably connected with a collector ring of the generator rotor loop, and realizes correct pickup of voltage of loop formed by current of the microohm resistance measuring instrument in the rotor and voltage drop of the rotor loop.
The measuring tool for the loop resistance of the generator rotor and the loop resistance of the carbon brush has the external dimension consistent with that of a common carbon brush, and can be inserted into a brush holder like the common carbon brush.
The current probes bear the heavy current injection task of the microohm resistance measuring instrument and are connected together by the bus bars, each probe is provided with an independent built-in spring, and the contact pressure of the probes and the collector ring can be adjusted along with the radian of the surface of the collector ring, so that the current probes are ensured to be in good contact with the collector ring.
The voltage probes are used for carrying the voltage pickup task of the micro-ohm resistance measuring instrument and are connected together through the bus bars, each small probe is provided with an independent built-in spring, and the contact pressure of the probes and the collector rings can be adjusted along with the radian of the surfaces of the collector rings, so that the voltage probes are ensured to be in good contact with the collector rings.
The current probe bears the task of large current transmission, at least the current carrying capacity of 100A is ensured, so the number of the probes is selected according to the current carrying capacity of the small probes, and the contact surface of the probes is hemispherical, thereby ensuring seamless contact with the arc-shaped collecting ring.
The voltage probes are subjected to a voltage pickup task, so that the number of small probes is enough to ensure reliable pickup voltage, and the contact surface of each probe is hemispherical, so that seamless contact with an arc-shaped collecting ring is ensured.
The current probe is connected with the current bus bar and the current wiring terminal, and can be connected with the current output of the micro-ohm resistance measuring instrument.
The voltage probe is connected with the voltage busbar and the voltage wiring terminal, and can be connected with the voltage pick-up of the micro-ohm resistance measuring instrument.
The current probe and the voltage probe are protected by an insulating protective cover and cannot be connected with the carbon brush holder.
The measuring tool provided by the embodiment of the application is a channel for communicating a current path and a voltage pickup between the microohm resistance measuring instrument and the collecting ring, so that the measuring of the loop resistance of the generator rotor is possible under the condition that the brush holder and the excitation busbar are not removed, namely, the measuring during minor repair, and the measuring of the loop resistance of the carbon brush is also possible.
The specific method for measuring the resistance of the generator rotor loop 301 is as follows:
as shown in fig. 3, one carbon brush is removed from each of the positive collector ring 302 and the negative collector ring 303 of the generator, the generator rotor loop resistance and carbon brush loop resistance measuring tool of the present application is replaced, and the current wire of the microohm resistance measuring instrument is connected to the current connecting terminal 3 of the generator rotor loop resistance and carbon brush loop resistance measuring tool 10 of the present application to form a current loop; the voltage line of the microohm resistance measuring instrument is connected to the voltage connection terminal 2 of the measuring tool 10 to form a voltage loop. The resistance of the generator rotor circuit 301 can be measured according to the measuring method of the microohm resistance measuring instrument without manually winding soft wiring, disassembling the brush holder and the excitation bus, and the resistance of the generator rotor circuit 301 can be conveniently measured during minor repair.
The specific method for measuring the carbon brush loop resistance 404 is as follows:
as shown in fig. 4, the carbon brush loop resistance 404 is composed of a carbon brush lead resistance 401, a carbon brush body resistance 402 and a contact resistance 403 of the contact surface of the carbon brush and the collecting ring, and the sum of the three resistances is measured. The carbon brush lead resistance 401 is generally unchanged, and the carbon brush body resistance 402 is changed along with shortening of the carbon brush in operation, and the carbon brush contact resistance 403 is related to the carbon brush pressure, the material and the contact area of the carbon brush and the contact surface of the collecting ring. The measuring resistance needs to have a current loop and a voltage loop, and it can be seen from the figure that the carbon brush is in contact with the surface of the collecting ring, and the collecting ring cannot be connected with a current wire and a voltage wire of the microohm resistance measuring instrument, so that the carbon brush loop resistance 404 cannot be directly measured, and the carbon brush loop resistance 404 can be measured by an indirect method by using the measuring tool 10 for the rotor loop resistance and the carbon brush loop resistance of the generator.
In the first step, two adjacent carbon brushes are replaced with the tool 10 for measuring the rotor loop resistance and the carbon brush loop resistance of the present application, as shown in fig. 5, the current wires of the microohm resistance measuring instrument are respectively connected to the current connecting terminals 3 of the two measuring tools 10 for measuring the rotor loop resistance and the carbon brush loop resistance of the present application, the voltage wires of the microohm resistance measuring instrument are respectively connected to the two measuring tool voltage connecting terminals 2, and the resistance between the two adjacent carbon brush collecting rings is measured as a correction resistor 501 for correcting the measurement result.
In the second step, a carbon brush and a measuring tool are reserved, as shown in fig. 6, the current wire of the microohm resistance measuring instrument is connected to the carbon brush lead 601 and the current connecting terminal 3 of the measuring tool, the voltage wire of the microohm resistance measuring instrument is connected to the carbon brush lead 601 and the voltage connecting terminal 2 of the measuring tool, and the measured result is the sum of the carbon brush loop resistance 404 and the correction resistance 501.
In the third step, the result of subtracting the corrected resistance 501 measured in the first step from the measured result in the second step is the carbon brush loop resistance 404 that we want to measure.
Fourth, repeating the first to third steps, and measuring all carbon brush loop resistances 404.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (1)
1. The utility model provides a generator rotor loop resistance and carbon brush loop resistance measuring tool which is characterized in that, including insulating safety cover and by stretching out voltage probe, the current probe in the insulating safety cover, voltage probe is connected with voltage binding post through the voltage busbar, and the current probe is connected with current binding post through the current busbar, and voltage busbar and current busbar all set up in insulating safety cover, voltage binding post, current binding post all set up outside insulating safety cover;
the insulation protection cover is cuboid, the voltage probe and the current probe extend out from the front end face of the insulation protection cover, and the voltage wiring terminal and the current wiring terminal are arranged below the bottom face of the insulation protection cover;
the plurality of current probes are arranged, each current probe comprises a current needle head, an outer tube and a spring arranged between the current needle head and the outer tube, the current needle heads of the plurality of current probes are connected with a current bus bar, and the current bus bar is connected with a current wiring terminal, so that the current probes can stretch and retract along with the radian of the surface of the collecting ring, and good contact between the current probes and the collecting ring is ensured;
the voltage probes comprise voltage needles, an outer tube and springs arranged between the voltage needles and the outer tube, the voltage needles of the voltage probes are connected with voltage bus bars, and the voltage bus bars are connected with voltage wiring terminals, so that the voltage probes can stretch and retract along with the radian of the surface of the collecting ring, and good contact between the voltage probes and the collecting ring is ensured;
the front end contact surfaces of the voltage needle head and the current needle head are hemispherical, so that seamless contact with the arc-shaped collecting ring is ensured;
the method for measuring the resistance of the rotor loop of the generator by using the tool comprises the following steps:
respectively detaching a carbon brush from a positive collecting ring and a negative collecting ring of the generator, respectively contacting a voltage probe and a current probe of a measuring tool with the positive collecting ring and the negative collecting ring at the position of the original carbon brush, and connecting a current wire of a microohm resistance measuring instrument to a current connecting terminal of the measuring tool to form a current loop; connecting a voltage line of the microohm resistance measuring instrument to a voltage wiring terminal of the measuring tool to form a voltage loop;
measuring the resistance of a rotor loop of the generator by using a microohm resistance measuring instrument;
the method for measuring the carbon brush loop resistance by using the tool comprises the following steps:
the first step: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the positions of the original carbon brushes, respectively contacting voltage probes and current probes of the measuring tools with carbon brush collecting rings, respectively connecting current wires of a microohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage wires of the microohm resistance measuring instrument with the voltage connecting terminals of the two measuring tools, measuring the resistance between the two adjacent carbon brush collecting rings, and using the resistance as a correction resistance for correcting a measuring result;
and a second step of: reserving one measuring tool, removing the other measuring tool, installing an original carbon brush, connecting a current wire of a microohm resistance measuring instrument with a carbon brush lead and a current wiring terminal of the measuring tool respectively, connecting a voltage wire of the microohm resistance measuring instrument with a carbon brush lead and a voltage wiring terminal of the measuring tool respectively, and measuring the sum of a carbon brush loop resistance and a correction resistance;
and a third step of: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain a carbon brush loop resistance value;
fourth step: and repeating the first step, the second step and the third step, and measuring the resistance values of all carbon brush loops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110022283.XA CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110022283.XA CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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| Publication Number | Publication Date |
|---|---|
| CN112881807A CN112881807A (en) | 2021-06-01 |
| CN112881807B true CN112881807B (en) | 2023-11-14 |
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| CN202110022283.XA Active CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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| CN114421249B (en) * | 2022-01-04 | 2024-07-12 | 大唐长春第二热电有限责任公司 | Carbon brush and brush holder device with intelligent measurement and control function |
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