CN212989429U - Power transformer high-voltage lead switching system - Google Patents
Power transformer high-voltage lead switching system Download PDFInfo
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- CN212989429U CN212989429U CN202021660108.0U CN202021660108U CN212989429U CN 212989429 U CN212989429 U CN 212989429U CN 202021660108 U CN202021660108 U CN 202021660108U CN 212989429 U CN212989429 U CN 212989429U
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Abstract
The utility model discloses a power transformer high-voltage lead switching system, which comprises at least four groups of leads, wherein one end of each lead is used for connecting a power transformer, and the other end of each lead is used for connecting a lead switching unit through a sleeve end screen wire collecting box and a test main clamp; the lead conversion unit comprises at least four groups of terminal modules, each terminal module corresponds to each group of leads, and each terminal module comprises a plurality of rows of plug terminals; the copper bars are used for the terminal modules, and each copper bar comprises strip-shaped plugging copper sheets which are communicated with the multiple rows of plugging terminals of each terminal module and form short circuits; wherein the line number of the strip-shaped plugging copper sheet is less than that of the plugging terminal. The device improves the experimental work efficiency of power transformer, saves test time, makes things convenient for the experimenter to change experimental wiring, reduces the safety risk of experimenter in the process of the test.
Description
Technical Field
The utility model relates to an electrical test equipment auxiliary device processing operation field especially relates to a power transformer high voltage lead wire switching system.
Background
The power transformer is one of the most important devices in the power grid, and the reliable operation of the transformer is directly related to the safe and stable operation of the power grid. Power transformer routines and handover tests require many test items, such as winding insulation resistance tests, bushing insulation resistance tests, winding dielectric loss and capacitance tests, winding dc resistance tests, on-load tap changer characteristic tests, bushing dielectric loss and capacitance tests, short circuit impedance tests, etc. Different test wiring needs to be replaced in different tests, test wiring needs to be replaced by a tester for a transformer to go up and down continuously, particularly, a high-voltage power transformer of 220kV or above is large in size, a wire outlet sleeve is as long as more than 2m, and a test lead can be replaced by an insulating bucket arm vehicle. The test time of the power transformer is greatly prolonged, and the safety risk of the test personnel in the climbing operation is increased.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a power transformer high voltage lead wire switching system to it is long to solve power transformer test time, problem that the experimenter operation risk is high.
In order to solve the above problem, the embodiment of the utility model discloses a power transformer high voltage lead wire switching system, include: one end of each group of lead wires is connected with a power transformer, and the other end of each group of lead wires is connected with a lead wire conversion unit through a sleeve end screen wire collecting box and a test main clamp respectively; the lead conversion unit comprises at least four groups of terminal modules, each terminal module is correspondingly connected with each group of leads, and each terminal module converts each group of leads into a plurality of rows of plug terminals for connecting electronic analysis equipment; the copper bars are used for the terminal modules, and each copper bar comprises strip-shaped plugging copper sheets which are communicated with the multiple rows of plugging terminals of each terminal module and form short circuits; wherein the line number of the strip-shaped plugging copper sheet is less than that of the plugging terminal.
Further, the at least four sets of terminal modules include: four groups of terminal modules which are respectively and correspondingly connected with a high-voltage winding, a medium-voltage winding, a low-voltage winding and a sleeve end screen of the power transformer.
Furthermore, the bushing end screen concentrator comprises a row of plug terminals for connecting the high-voltage bushing end screen of the power transformer and a row of plug terminals for connecting the medium-voltage bushing end screen of the power transformer; and the two rows of plug terminals are connected with the terminal modules of the sleeve pipe end screen of the lead conversion unit through leads.
Further, the types of the plurality of copper bars at least comprise: the first copper bar is used for realizing all short circuit of the plug wire terminal; or, a second copper bar with a row of non-short-circuit terminals is arranged on the plug wire terminal.
The utility model discloses a power transformer high voltage lead wire switching system, can realize the wiring of transformer, when carrying out multiple test, change wiring connected mode through the copper bar, it is experimental to accomplish power transformer's winding and sleeve pipe insulation resistance, winding dielectric loss and capacitance are experimental, the winding direct current resistance is experimental, it is experimental to have the tapping switch characteristic, sleeve pipe dielectric loss and capacitance are experimental, power transformer routine and the experimental conventional test project of handing-over such as short-circuit impedance test, need not personnel and go up the transformer many times, through the low efficiency test that uses the high altitude construction car to change experimental wiring, tester has been made things convenient for, and the operating efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic overall wiring diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of a lead conversion unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a bushing end screen cluster box according to an embodiment of the present invention;
fig. 4 is a schematic view of a copper bar according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a short circuit of a copper bar in a direct resistance test, a transformation ratio test and a short resistance test;
FIG. 6 is a schematic diagram of a short circuit of an on-load test copper bar;
FIG. 7 is a schematic diagram of a short circuit of a copper bar for dielectric loss test of a high-voltage phase-A casing;
FIG. 8 is a schematic diagram of a short circuit of a copper bar for the dielectric loss test of the high-voltage phase-B casing;
FIG. 9 is a schematic diagram of a short circuit of a copper bar for testing the insulation resistance of a high-voltage C-phase sleeve end screen to the ground;
FIG. 10 is a schematic diagram of a short circuit of a copper bar for testing the insulation resistance of a high-voltage N-phase sleeve end screen to the ground.
In the figure: 1. the device comprises a lead, 2, a power transformer, 3, a bushing end screen wire collecting box, 4, a test main clamp, 5, a lead conversion unit, 6, a terminal module, 7, a first copper bar and 8, a second copper bar.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a power transformer high voltage lead switching system. As shown in fig. 1 to 4, the apparatus includes: one end of each group of lead wires 1 is connected with a power transformer 2, and the other end of each group of lead wires 1 is connected with a lead wire conversion unit 5 through a sleeve end screen wire collecting box 3 and a test main clamp 4 respectively; the lead conversion unit 5 comprises at least four groups of terminal modules 6, each terminal module 6 is correspondingly connected with each group of leads 1, and each terminal module converts each group of leads 1 into a plurality of rows of plug terminals for connecting electronic analysis equipment; a plurality of copper bars for the terminal modules 6, each copper bar comprising strip-shaped plug copper sheets which are conducted with the rows of plug terminals of each terminal module 6 and form short circuits; wherein the line number of the strip-shaped plugging copper sheet is less than or equal to the line number of the plugging terminal.
Each terminal module corresponds to a plurality of different strip-shaped inserted copper sheets so as to meet the short-circuit requirements of different tests. And the contact pin of every group lead wire is converted into the plug wire terminal, is convenient for connect electronic analysis equipment.
The test main clamp 4 is divided into two types, namely a short-circuit structure and a short-circuit mechanism. Specifically, the three-core main clamp without the short-circuit mechanism is a high-voltage winding test main clamp, and the four-core test main clamp with the short-circuit mechanism is a middle-voltage winding test main clamp and a low-voltage winding test main clamp; the short circuit mechanism mainly carries out the short circuit between the winding when short resistance tests, only needs to screw in the screw rod to the end when using and accomplishes the short circuit, except short resistance, unscrews the screw rod during other experimental items, does not carry out the short circuit.
The lead 1 is divided into a main test lead, a sleeve test branch and a tail screen test line. Specifically, the test main leads are four in number and comprise a high-voltage winding, a medium-voltage winding, a low-voltage winding and a sleeve end screen test main line, wherein the test main line is connected into a main clamp and correspondingly connected into A phases of the high-voltage winding, the medium-voltage winding and the low-voltage winding of the transformer respectively; when the design of the main lead is tested, the fact that the shielding with the outer layer can not be contacted with the high-voltage part of the sleeve to be too close to the high-voltage part of the sleeve to generate breakdown is considered, so that a section of shielding without the outer layer is arranged at one end close to the clamp connector, the connector can be upwards connected during wiring, and the main lead with the outer shielding is far away from the high-voltage part. The sleeve testing branch line and the slave clamp are respectively provided with three cores and four cores and are matched with the master clamp for use, and the three-core branch line is connected with the high-voltage winding testing master clamp and the three-core slave clamp and is connected with each phase of high-voltage winding; the four-core branch line is connected with a middle (low) winding test main clamp and a four-core slave clamp and is connected with middle (low) voltage windings of all phases; when the test branch is connected with each phase winding, attention needs to be paid to keeping the distance to the ground; when the bushing test branching connection is carried out, the appropriate length of branching is selected according to the distance between the bushings, if the branching is too long, the branching can be wound on the clamp, and the branching can be far away from the body and other grounding parts as far as possible, so that errors and other discharge hidden troubles caused by data can be avoided. The red clamp of end screen test wire is measuring terminal, inserts transformer bushing end screen lead-out wire during the use, and black shielded wire inserts the clip and connects transformer body ground connection can.
The at least four sets of terminal modules 6 include: and four groups of terminal modules which are respectively and correspondingly connected with a high-voltage winding, a medium-voltage winding, a low-voltage winding and a sleeve end screen of the power transformer 2.
The bushing end screen concentrator 3 comprises a row of plug terminals for connecting the high-voltage bushing end screen of the power transformer 2 and a row of plug terminals for connecting the medium-voltage bushing end screen of the power transformer 2; two rows of plug terminals are connected with the terminal module 6 of the sleeve end screen of the lead conversion unit 5 through leads. Specifically, the end screen wire collecting box has eight access terminals, the upper row is a high-voltage end screen terminal, and the lower row is a medium-voltage end screen terminal; when in use, the end screen test lines are respectively connected with the end screens of the transformers; when the junction box is used for wiring, the terminal outer ring spring nut is pressed down, the end screen test wire is inserted, and then the terminal outer ring spring nut is loosened, and the nut is restored to be flat, namely, the connection is reliable.
The types of the plurality of copper bars at least comprise: the first copper bar 7 for realizing all short circuit of the plug wire terminal comprises an A/B/C/N phase and a grounding end; or, the second copper bar 8 with one row of non-short-circuit plug wire terminals is used for short-circuit of the A/B/C/N phase and the partial row terminals in each row of the grounding terminal. Specifically, the short circuit copper bars mainly realize the connection state of each winding of the transformer during measurement, and the short circuit state of the transformer during experiment can be completed by connecting different short circuit copper bars with the terminal of the switching unit.
The lead conversion unit 5 is a high-voltage lead conversion unit of the power transformer, the shell structure is made of stainless steel, the length of the shell is 500mm, the width of the shell is 400mm, the height of the shell is 500mm, the height of the box cover is 100mm, the length of the box cover is 500mm, and the width of the box cover is 400 mm. The plug pin of mainly used every group lead wire converts the plug wire terminal into, is convenient for connect electronic analysis equipment.
When the power transformer short circuit testing device is used, after the wiring is carried out in the mode shown in figure 1, the conventional test items of routine and handover tests of the power transformer such as winding and sleeve insulation resistance tests, winding dielectric loss and capacitance tests, winding direct current resistance tests, on-load tap-changer characteristic tests, sleeve dielectric loss and capacitance tests, short-circuit impedance tests and the like can be completed only by short-circuiting various different copper bars and connecting corresponding leads and terminals.
To sum up, the utility model discloses power transformer high voltage lead wire switching system can realize the last wiring of transformer, need not personnel and upper and lower transformer many times, has improved the operating efficiency, has guaranteed personnel's safety.
The embodiments described above may implement a variety of tests, including: direct resistance testing, transformation ratio testing, load testing, short resistance testing, dielectric loss testing, insulation resistance testing and the like.
The connection mode of some tests and how to realize various tests through different copper bars are explained in detail according to the attached drawings.
And (3) direct resistance testing: as shown in fig. 5, the sleeve end screen and the shield thereof are short-circuited by a copper bar 1, and then grounded by a short-circuit wire, and the direct resistance instrument is connected to the corresponding terminal according to the test requirement during the direct resistance test.
And (3) transformation ratio testing: as shown in figure 5, the sleeve end screen and the shielding thereof are in short circuit through a copper bar 1, then the short circuit is grounded, and the transformation ratio test connects the transformation ratio instrument to the corresponding terminal according to the test requirement.
And (3) carrying test: as shown in fig. 6, the medium-voltage winding, the low-voltage winding and the bushing end screen are all in short circuit with the copper plate 1, then are grounded through the short-circuit wires, and the on-load test connects the on-load switch tester to the corresponding terminal according to the test requirement.
Short resistance test: as shown in fig. 5, the bushing end screen and the shielding thereof are short-circuited by a copper bar 1, then the short-circuit line is grounded, the short-circuit test connects the measuring instrument to the corresponding terminal according to the test requirement, and meanwhile, the short-circuit clamp on the transformer is short-circuited, for example, the high-to-low short-circuit test is carried out, the low-voltage clamp is screwed into the short-circuit, and the medium voltage is unchanged.
The dielectric loss test only introduces two connection modes for testing, and other connection modes for the dielectric loss test can be referred to; the method comprises the following steps:
and (3) dielectric loss test of the high-voltage phase-A casing: as shown in fig. 7, the high voltage winding is shorted in copper bar 2; the medium-voltage winding and the low-voltage winding are all in short circuit with the shielding by a copper bar 1, the sleeve end screen is in short circuit with the shielding by a copper bar 3 except the A phase, the dielectric loss instrument high-voltage wire is connected to a high-voltage short circuit terminal through a short circuit wire for grounding (note that the grounding short circuit wire cannot touch the high-voltage wire and the shell), the shielding wire is connected to the shielding terminal, and the Cx signal wire is connected to the sleeve end screen A phase;
and (3) dielectric loss test of the high-voltage phase-B casing: as shown in fig. 8, the high voltage winding is shorted in copper bar 2; the medium-voltage winding and the low-voltage winding are all in short circuit with the shielding by the copper bar 1, the sleeve end screen is in short circuit with the shielding by the copper bar 4 except the B phase, the dielectric loss instrument high-voltage wire is connected to the high-voltage short circuit terminal through the short circuit wire for grounding (note that the grounding short circuit wire cannot touch the high-voltage wire and the shell), the shielding wire is connected to the shielding terminal, and the Cx signal wire is connected to the sleeve end screen B phase.
Insulation resistance test only introduces two connection modes for testing, and other connection modes for insulation resistance test can be referred to;
testing the insulation resistance of the high-voltage C-phase sleeve end screen to the ground: as shown in fig. 9, the high-voltage winding, the medium-voltage winding, the low-voltage winding and the shield are all in short circuit by a copper bar 1 and are grounded through a short-circuit wire (the grounded short-circuit wire cannot touch the high-voltage wire and the shell); the sleeve end screen is in short circuit by a copper bar 5 except for the C phase, the L end (high voltage end) of the insulation ohmmeter is connected with a sleeve end screen short circuit terminal, the E end is grounded, and the G end is connected with a shielding terminal;
testing the insulation resistance of the high-voltage N-phase sleeve end screen to the ground: as shown in fig. 10, the high-voltage winding, the medium-voltage winding, the low-voltage winding and the shield are all in short circuit by a copper bar 1 and are grounded by a short-circuit wire (the grounded short-circuit wire cannot touch the high-voltage wire and the shell); the sleeve end screen is in short circuit by a copper bar 6 except for N phases, the L end (high-voltage end) of the insulation ohmmeter is connected with the sleeve end screen short circuit terminal, the E end is grounded, and the G end is connected with the shielding terminal.
Besides the above, the method can be used for testing low-high middle and ground winding dielectric loss, middle-high low and ground winding dielectric loss, high-middle and low-ground winding dielectric loss, medium-voltage Am phase sleeve dielectric loss, medium-voltage Bm phase sleeve dielectric loss, medium-voltage Cm phase sleeve dielectric loss, medium-voltage Nm phase sleeve dielectric loss and the like, and particularly can select strip copper sheets to carry out short circuit according to the testing requirements.
Preferably, insulation resistance tests can also be carried out, such as low-high middle and ground winding insulation resistance, middle-high low ground winding insulation resistance, high-middle and low ground winding insulation resistance, high-voltage A phase sleeve end screen to ground insulation resistance, high-voltage B phase sleeve end screen to ground insulation resistance, high-voltage C phase sleeve end screen to ground insulation resistance, high-voltage N phase sleeve end screen to ground insulation resistance, medium-voltage Am phase sleeve end screen to ground insulation resistance, medium-voltage Bm phase sleeve end screen to ground insulation resistance, medium-voltage Cm phase sleeve end screen to ground insulation resistance, high-voltage Nm phase sleeve end screen to ground insulation resistance and the like.
The utility model discloses a power transformer high voltage lead wire switching system, can realize the wiring of transformer, when carrying out multiple test, change wiring connected mode through the copper bar, it is experimental to accomplish power transformer's winding and sleeve pipe insulation resistance, winding dielectric loss and capacitance are experimental, the winding direct current resistance is experimental, it is experimental to have the tapping switch characteristic, sleeve pipe dielectric loss and capacitance are experimental, power transformer routine and the experimental conventional test project of handing-over such as short-circuit impedance test, need not personnel and go up the transformer many times, through the low efficiency test that uses the high altitude construction car to change experimental wiring, tester has been made things convenient for, and the operating efficiency is improved.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A power transformer high voltage lead switching system, comprising:
the device comprises at least four groups of leads (1), wherein one end of each group of leads (1) is connected with a power transformer (2), and the other end of each group of leads (1) is connected with a lead conversion unit (5) through a sleeve end screen wire collecting box (3) and a test main clamp (4) respectively;
the lead conversion unit (5) comprises at least four groups of terminal modules (6), each terminal module (6) is correspondingly connected with each group of leads (1), and each terminal module converts each group of leads (1) into a plurality of rows of plug terminals for connecting electronic analysis equipment;
the copper bars are used for the terminal modules (6), and each copper bar comprises strip-shaped plugging copper sheets which are communicated with the multiple rows of plugging terminals of each terminal module (6) and form short circuits; wherein the line number of the strip-shaped plugging copper sheet is less than that of the plugging terminal.
2. A power transformer high voltage lead transition system according to claim 1, characterized in that said at least four sets of terminal modules (6) comprise: four groups of terminal modules which are respectively and correspondingly connected with a high-voltage winding, a medium-voltage winding, a low-voltage winding and a sleeve end screen of the power transformer (2).
3. A power transformer high voltage lead switching system according to claim 2, wherein said bushing shield terminal block (3) comprises a row of plug terminals for connection to a high voltage bushing shield of a power transformer (2), a row of plug terminals for connection to a medium voltage bushing shield of a power transformer (2);
two rows of plug terminals are connected with the terminal module (6) of the sleeve end screen of the lead conversion unit (5) through leads.
4. The power transformer high voltage lead switching system according to claim 2, wherein the plurality of copper bars are of a type including at least:
a first copper bar (7) for realizing all short circuit of the plug wire terminal;
or, a row of non-short-circuit second copper bars (8) exist in the wire plugging terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021660108.0U CN212989429U (en) | 2020-08-11 | 2020-08-11 | Power transformer high-voltage lead switching system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021660108.0U CN212989429U (en) | 2020-08-11 | 2020-08-11 | Power transformer high-voltage lead switching system |
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| CN212989429U true CN212989429U (en) | 2021-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062734A (en) * | 2021-12-09 | 2022-02-18 | 天威保变(合肥)变压器有限公司 | Wire sealing device for load short circuit test |
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2020
- 2020-08-11 CN CN202021660108.0U patent/CN212989429U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062734A (en) * | 2021-12-09 | 2022-02-18 | 天威保变(合肥)变压器有限公司 | Wire sealing device for load short circuit test |
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