CN109787430B - Installation method of polarity reversing device box - Google Patents
Installation method of polarity reversing device box Download PDFInfo
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- CN109787430B CN109787430B CN201811618016.3A CN201811618016A CN109787430B CN 109787430 B CN109787430 B CN 109787430B CN 201811618016 A CN201811618016 A CN 201811618016A CN 109787430 B CN109787430 B CN 109787430B
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- busbar
- copper bar
- device box
- box body
- polarity reversing
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Abstract
The invention discloses an installation method of a polarity reversing device box, which comprises the following steps of dismantling an excitation lead transfer terminal box in a wind tunnel of a hydraulic generator, and transforming the terminal box into a polarity reversing device box body; installing a polarity reversing device box body on the position of the transfer terminal box through a box body drilling hole, and clamping and then threading a U-shaped sealing rubber strip at a wire inlet and outlet hole; opening a polarity reversing device box body, and installing a first converging copper bar and a second converging copper bar which enter and exit two positive and negative poles in the polarity reversing device box body; the positive and negative electrodes of the first busbar are connected with the positive and negative electrodes of the rotor coil; the positive and negative electrodes of the second busbar are connected with the positive and negative electrodes at the lower end of the de-excitation switch; installing isolation switches 1QS and 2QS on the two confluence copper bars; after the connection of the polarity reversing device box body is completed, a sealing adhesive tape is embedded in the box door to fasten the box door. Through the scheme, the purpose of uniform abrasion of the positive electrode and the negative electrode of the slip ring is achieved, and the slip ring has high practical value and popularization value.
Description
Technical Field
The invention belongs to the field of power stations, and particularly relates to an installation method of a polarity reversing device box.
Background
The 4X 190MW unit of the main workshop of the purple plateau hydroelectric power plant is produced by eastern electric machinery corporation. The exciting current of the generator is transmitted to the rotating slip ring and the rotor coil through the static parts such as the conducting ring and the carbon brush, the slip ring is in dynamic and static contact with the carbon brush, and the abrasion of the contact surface between the slip ring and the carbon brush has two conditions of electrical and mechanical abrasion under the action of current and mechanical abrasion under the action of no current. Under the action of 'anode evaporation' and 'cathode pulverization', the wear of the positive electrode of the slip ring is small, the wear of the negative electrode of the slip ring is large, so that the polarity of the slip ring needs to be periodically switched to keep balance, but the situation is not considered in the design of the factory, so that the polarity cannot be switched due to the limitation of cables on site. After the production, the collector ring of the slip ring chamber of the unit is burnt to cause accident shutdown, the slip rings of other three units are checked afterwards, and the fact that the surfaces (positive and negative electrodes) of the slip rings are uneven, have grooves and the surface oxide films are worn out, the negative electrode is more serious than the positive electrode, and needs to be returned to a factory for treatment is found. Therefore, how to realize the purpose of periodically switching the disconnecting link to switch the polarity of the excitation cable so that the wear of the positive and negative electrode surfaces of the slip ring is uniform and the service life of the slip ring is prolonged is a problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a method for installing a polarity reversing device box, which mainly solves the problem that in the prior art, the abrasion of a positive electrode and a negative electrode of a collecting ring is uneven because the polarity of an excitation cable cannot be changed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for installing a polarity reversing device box comprises a polarity reversing device box body, a first confluence copper bar and a second confluence copper bar which are installed inside the polarity reversing device box body, a rotor coil of which the positive pole and the negative pole are respectively connected with the positive pole and the negative pole of the first confluence copper bar, and a demagnetization switch of which the positive pole and the negative pole are respectively connected with the positive pole and the negative pole of the second confluence copper bar, wherein the polarity reversing from a slip ring to the rotor coil is realized by the first confluence copper bar and the second confluence copper bar through two double-blade isolation switches 1QS and 2 QS;
the installation method comprises the following steps:
1) dismantling an excitation lead transfer terminal box in a wind tunnel of the hydraulic generator, and transforming the terminal box into a polarity reversing device box body with a polarity reversing function;
2) welding a support arm on the position of the original excitation lead transfer terminal box through a box body drilling hole to install a polarity switching device box body, clamping the openings of an incoming wire and an outgoing wire of the polarity switching device box body by using a U-shaped sealing rubber strip, then threading, and fixing an insulating pressing plate by using a bolt after threading is finished;
3) opening a polarity reversing device box body, and installing a first bus copper bar and a second bus copper bar which are provided with positive and negative electrodes in the polarity reversing device box body;
4) four cables are led out from the positive electrode of the first busbar copper bar to the slip ring chamber and then to the positive electrode of the rotor coil, and four cables are led out from the negative electrode of the busbar copper bar to the slip ring chamber and then to the negative electrode of the rotor coil;
5) the positive pole of the second busbar copper bar is led in by four positive cables at the lower end of the de-excitation switch, and the negative pole of the busbar copper bar is led in by four negative cables at the lower end of the de-excitation switch (the de-excitation switch is equivalent to a circuit breaker, the de-excitation switch is turned on when voltage is built, the de-excitation resistor is turned on when the de-excitation switch is turned off, and a de-excitation loop is put into the de-excitation loop to prevent overvoltage, so that the over-voltage is avoided;
6) two isolating knife switches 1QS and 2QS are arranged at the central positions of a first busbar copper bar and a second busbar copper bar which have positive and negative poles;
7) after the connection of the electrical equipment in the polarity reversing device box body is completed, a sealing adhesive tape is embedded in the box door of the polarity reversing device box body to buckle the box door.
Further, in the step 3), when the first bus bar and the second bus bar are installed, drilling is needed and then tin coating treatment is performed, then the connection positions of the first bus bar and the second bus bar and the drilling are coated with conductive paste, and then fastening is performed through bolts.
Further, the second busbar in step 3) is transversely installed 140mm away from the bottom of the polarity reversing device box body, the first busbar is transversely installed above the second busbar at a longitudinal distance of 240mm, the lengths of the first busbar and the second busbar are 80mm, and the row spacing between the anode and the cathode of each busbar is 80 mm.
Further, in step 6), the isolation switches 1QS and 2QS fix two isolation switches at a position 40mm away from the bottom plate of the polarity reversing device box body through an RF-4 epoxy insulating plate, and the transverse distance between the isolation switches 1QS and 2QS is 100 mm.
Further, in the step 6), the isolation switch 1QS and the isolation switch 2QS are double isolation switches, two ends of one switch of the isolation switch 1QS are respectively connected with anodes of the first busbar and the second busbar, and the other switch of the isolation switch 1QS is respectively connected with cathodes of the first busbar and the second busbar; two ends of one knife of the isolation knife switch 2QS are respectively connected with the anode of the first confluence copper bar and the cathode of the second confluence copper bar, and the other knife of the isolation knife switch 2QS is respectively connected with the cathode of the first confluence copper bar and the anode of the second confluence copper bar.
Furthermore, the first busbar and the second busbar are transversely installed in the polarity reversing device box body.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention utilizes the position of the excitation lead transfer terminal box in the wind tunnel of the hydraulic generator to arrange the polarity reversing device, integrates the functions of terminal transfer and polarity reversing, meets the requirements of regulations and specifications, saves a large amount of space, simultaneously, the box body inlet and outlet holes of the box body of the polarity reversing device are opened according to the actual site positions, new cables are replaced to be wired according to the trend of the original excitation cables and the original cable polarity connection, two isolating disconnecting switches are respectively connected with two bus copper bars in different modes, the polarity switching can be realized, the abrasion of the anode and the cathode of the slip ring is relatively uniform, the service life of the slip ring can be prolonged, and the operation safety of a unit is ensured.
(2) The isolation switch installed in the polarity reversing device box body is installed behind the shunt below the field suppression switch FMK, the polarity of the measuring meter is not required to be reversed after the polarity of the slip ring is reversed, and the isolation switch is reasonable in layout in the device, convenient to operate and control and beneficial to maintenance.
(3) The polarity reversing device box body is firmly and stably installed; the capacity, the performance and the mechanical strength of the isolation disconnecting link all meet the design specification requirements, and the stability of the operation equipment is powerfully guaranteed.
Drawings
FIG. 1 is a schematic view of the flow structure of the present invention.
Fig. 2 is a schematic diagram of the polarity reversing device box body of the present invention.
Fig. 3 is a schematic diagram of a conventional excitation lead switching device.
Detailed Description
The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.
Examples
As shown in fig. 1 to 3, a method for installing a polarity reversing device box includes a polarity reversing device box body 1, a first busbar 2 and a second busbar 3 installed inside the polarity reversing device box body 1, a rotor coil 4 having an anode and a cathode respectively connected to the anode and the cathode of the first busbar, and a field-suppression switch 5 having an anode and a cathode respectively connected to the anode and the cathode of the second busbar, where the polarity reversing from a slip ring to the rotor coil is implemented by the first busbar 2 and the second busbar 3 through two double-blade isolation switches 1QS6 and 2QS 7.
The specific installation mode is as follows:
and (4) dismantling the generator excitation cable adapter terminal box in the wind tunnel. The polarity switching device box body is installed on the position of the original switching terminal box through drilling, and the U-shaped sealing rubber strips are clamped in the wire inlet and outlet openings of the polarity switching device box body for threading and then fastened by insulating pressing plate bolts. Opening the polarity switching device box body, installing a first confluence copper bar and a second confluence copper bar with positive and negative poles in the polarity switching device box body, installing the first confluence copper bar and the second confluence copper bar and connecting the copper bars with the isolation disconnecting link, drilling, coating tin, coating conductive paste in a matching way, and fastening by using bolts. The second copper bar that converges transversely installs, and apart from polarity switching device case body bottom 140mm department, with isolation switch lower extreme longitudinal distance 240mm department, the first copper bar that converges transversely installs, apart from polarity switching device case body top 140mm department, with isolation switch upper end longitudinal distance 240mm department, the first copper bar that converges, second converge copper bar length and be 800mm, converge the anodal 80mm with the negative pole interval of copper bar. Four cables are led out from the positive electrode of the first confluence copper bar to the slip ring chamber and then to the positive electrode of the rotor coil, and four cables are led out from the negative electrode of the confluence copper bar to the slip ring chamber and then to the negative electrode of the rotor coil. The positive pole of the second confluence copper bar is led in by four positive cables at the lower end of the de-excitation switch, and the negative pole of the confluence copper bar is led in by four negative cables at the lower end of the de-excitation switch. Two isolating switches 1QS and 2QS are installed in the center of the two inlet and outlet confluence copper bars, the isolating switches 1QS and 2QS are fastened on an RF-4 epoxy insulating plate through bolts, the distance between the isolating switches and a back plate of a polarity switching device box body is 40mm, the RF-4 epoxy insulating plate is tightly attached to the back plate of the polarity switching device box body through bolts in a fastening mode, and the transverse distance between the isolating switches 1QS and 2QS is 100 mm. The isolation knife switches 1QS and 2QS are double-knife-shaped isolation knife switches, and two ends of a knife of the isolation knife switch 1QS are respectively connected with the anodes of the first confluence copper bar and the second confluence copper bar; the other knife is respectively connected with the cathodes of the first busbar and the second busbar; two ends of the QS knife are respectively connected with the positive electrode of the first busbar and the negative electrode of the second busbar; the other knife is respectively connected with the cathode of the first busbar and the anode of the second busbar. After the connection of the electrical equipment in the device is completed, a sealing rubber strip is embedded into the box door of the polarity switching device box body to lock the box door.
During operation, the isolating switch 1QS is put into a switching-on working state, and the isolating switch 2QS is in a switching-off working state; on the contrary, switching 2QS is put into a switching-on working state, and isolating switch 1QS is in a switching-off state, so that power failure is required when the isolating switch is switched.
Wherein, the working principle of fig. 2 is as follows: the isolating switch 1QS is put into a switching-on working state, at the moment, the current of a positive ring of the slip ring flows to the slip ring from the carbon brush, the carbon brush (a de-excitation switch) is positive, the slip ring is negative, the wear of the positive ring is small and the wear of the negative ring is large under the actions of anode evaporation and cathode pulverization; on the contrary, when the 2QS is switched into a switching-on working state, current flows to the carbon brush from the slip ring, the carbon brush is a negative electrode, the slip ring is a positive electrode, and the negative ring is less worn and the positive ring is more worn under the actions of anode evaporation and cathode pulverization; the polarity of the isolation switch is switched by the equipment according to the operation time of half a year or 1 year, and the current direction is changed through the polarity switching, so that the abrasion of the anode and the cathode of the slip ring is uniform. Although fig. 3 can realize the exchange of the excitation leads, the positive and negative poles of the connected power supply are not changed due to the isolation switch, and the positive and negative poles of the power supply of different isolation switches are not exchanged when the isolation switch is switched as in the present invention, wherein PA in fig. 3 is a current shunt for measurement and protection.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but all changes that can be made by applying the principles of the present invention and performing non-inventive work on the basis of the principles shall fall within the scope of the present invention.
Claims (6)
1. The installation method of the polarity reversing device box is characterized in that the polarity reversing device box comprises a polarity reversing device box body (1), a first confluence copper bar (2) and a second confluence copper bar (3) which are installed inside the polarity reversing device box body (1), a rotor coil (4) of which the positive pole and the negative pole are respectively connected with the positive pole and the negative pole of the first confluence copper bar, and a de-excitation switch (5) of which the positive pole and the negative pole are respectively connected with the positive pole and the negative pole of the second confluence copper bar, wherein the polarity reversing of a slip ring to the rotor coil is realized by the first confluence copper bar (2) and the second confluence copper bar (3) through two double-knife-shaped isolation switches 1QS (6) and 2QS (7);
the installation method comprises the following steps:
1) dismantling an excitation lead transfer terminal box in a wind tunnel of the hydraulic generator, and transforming the terminal box into a polarity reversing device box body with a polarity reversing function;
2) welding a support arm on the position of the original excitation lead transfer terminal box through a box body drilling hole to install a polarity switching device box body, clamping the openings of an incoming wire and an outgoing wire of the polarity switching device box body by using a U-shaped sealing rubber strip, then threading, and fixing an insulating pressing plate by using a bolt after threading is finished;
3) opening a polarity reversing device box body, and installing a first bus copper bar and a second bus copper bar which are provided with positive and negative electrodes in the polarity reversing device box body;
4) four cables are led out from the positive electrode of the first busbar copper bar to the slip ring chamber and then to the positive electrode of the rotor coil, and four cables are led out from the negative electrode of the busbar copper bar to the slip ring chamber and then to the negative electrode of the rotor coil;
5) the positive pole of the second confluence copper bar is led in by four positive cables at the lower end of the de-excitation switch, and the negative pole of the second confluence copper bar is led in by four negative cables at the lower end of the de-excitation switch;
6) two isolating knife switches 1QS and 2QS are arranged at the central positions of a first busbar copper bar and a second busbar copper bar which have positive and negative poles;
7) after the connection of the electrical equipment in the polarity reversing device box body is completed, a sealing adhesive tape is embedded in the box door of the polarity reversing device box body to buckle the box door.
2. The method as claimed in claim 1, wherein in step 3), drilling is performed during installation of the first busbar and the second busbar, and then tin plating is performed, and then conductive paste is applied to the joints between the first busbar and the second busbar and the drilled holes, and then the first busbar and the second busbar are fastened by bolts.
3. The method as claimed in claim 2, wherein the second busbar assembly in step 3) is transversely installed 140mm away from the bottom of the polarity reversing device box, the first busbar assembly is transversely installed above the second busbar assembly by 240mm in longitudinal direction, the lengths of the first and second busbar assemblies are 80mm, and the row spacing between the positive and negative poles of each busbar assembly is 80 mm.
4. The method as claimed in claim 3, wherein in step 6), the isolation switches 1QS and 2QS fix two isolation switches at a distance of 40mm from the bottom plate of the polarity switching device box body through an RF-4 epoxy insulating plate, and the lateral distance between the isolation switches 1QS and 2QS is 100 mm.
5. The method according to claim 4, wherein in step 6), the isolation switch 1QS and the isolation switch 2QS are double isolation switches, two ends of a knife of the isolation switch 1QS are respectively connected to anodes of the first busbar and the second busbar, and the other knife of the isolation switch 1QS is respectively connected to cathodes of the first busbar and the second busbar; two ends of one knife of the isolation knife switch 2QS are respectively connected with the anode of the first confluence copper bar and the cathode of the second confluence copper bar, and the other knife of the isolation knife switch 2QS is respectively connected with the cathode of the first confluence copper bar and the anode of the second confluence copper bar.
6. The installation method of the polarity reversing device box according to claim 5, wherein the first busbar (2) and the second busbar (3) are installed transversely in the polarity reversing device box body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811618016.3A CN109787430B (en) | 2018-12-28 | 2018-12-28 | Installation method of polarity reversing device box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811618016.3A CN109787430B (en) | 2018-12-28 | 2018-12-28 | Installation method of polarity reversing device box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109787430A CN109787430A (en) | 2019-05-21 |
| CN109787430B true CN109787430B (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811618016.3A Expired - Fee Related CN109787430B (en) | 2018-12-28 | 2018-12-28 | Installation method of polarity reversing device box |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282490A (en) * | 2006-04-06 | 2007-10-25 | Hilti Ag | Reversible rotary electric motor |
| CN203233282U (en) * | 2013-05-27 | 2013-10-09 | 福建大唐国际宁德发电有限责任公司 | Generator with excitation bus commutation device |
| CN204103681U (en) * | 2014-10-20 | 2015-01-14 | 中国长江电力股份有限公司 | A kind of multipair excitation slip ring |
| CN204859052U (en) * | 2015-08-25 | 2015-12-09 | 南京化学工业园热电有限公司 | Female heat -extraction system of excitation sliding ring |
| CN206820610U (en) * | 2017-05-10 | 2017-12-29 | 国家电网公司 | Pole inversing device |
| KR20180014512A (en) * | 2016-08-01 | 2018-02-09 | 현대자동차주식회사 | System and method for start power generation of vehicle |
-
2018
- 2018-12-28 CN CN201811618016.3A patent/CN109787430B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282490A (en) * | 2006-04-06 | 2007-10-25 | Hilti Ag | Reversible rotary electric motor |
| CN203233282U (en) * | 2013-05-27 | 2013-10-09 | 福建大唐国际宁德发电有限责任公司 | Generator with excitation bus commutation device |
| CN204103681U (en) * | 2014-10-20 | 2015-01-14 | 中国长江电力股份有限公司 | A kind of multipair excitation slip ring |
| CN204859052U (en) * | 2015-08-25 | 2015-12-09 | 南京化学工业园热电有限公司 | Female heat -extraction system of excitation sliding ring |
| KR20180014512A (en) * | 2016-08-01 | 2018-02-09 | 현대자동차주식회사 | System and method for start power generation of vehicle |
| CN206820610U (en) * | 2017-05-10 | 2017-12-29 | 国家电网公司 | Pole inversing device |
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| CN109787430A (en) | 2019-05-21 |
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Granted publication date: 20201222 Termination date: 20211228 |