CN113376563A - Transformer lifting seat structure with current transformer test wire and test method - Google Patents
Transformer lifting seat structure with current transformer test wire and test method Download PDFInfo
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- CN113376563A CN113376563A CN202110636308.5A CN202110636308A CN113376563A CN 113376563 A CN113376563 A CN 113376563A CN 202110636308 A CN202110636308 A CN 202110636308A CN 113376563 A CN113376563 A CN 113376563A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a transformer lifting seat structure with a current transformer test wire and a test method, belonging to the technical field of transformer manufacturing. The technical scheme is as follows: the test wire (5) is led out from the upper end face of the multiple bushing type current transformer through the inner diameter side (12) of the transformer and from the lower end face of the bushing type current transformer, namely the test wire (5) penetrates through the inside of all the bushing type current transformers, and the two ends of the test wire (5) are led out of the lifting seat wall (8) through the small bushing I (3) and the small bushing II (11) respectively to form two test wiring ends, so that wiring is facilitated. The invention has the beneficial effects that: the problem that the test of the bushing type current transformer is difficult and the test error is large after the transformer is assembled is well solved, whether the bushing type current transformer is qualified or not can be well judged, the bushing type current transformer is prevented from being directly lifted out for inspection, and if the bushing type current transformer body is qualified, a large amount of manpower, material resources and financial resources can be saved.
Description
Technical Field
The invention relates to a transformer lifting seat structure with a current transformer test wire and a test method, in particular to a novel transformer lifting seat structure, which is convenient for testing a sleeve type current transformer in a transformer lifting seat on site and belongs to the technical field of transformer manufacturing.
Background
At present, a large power transformer generally adopts a split transportation and field assembly mode due to overlarge size, wherein a lifting seat is also transported separately from a transformer main body and assembled on the field. The sleeve type current transformers are generally arranged in the lifting seats, the sleeve type current transformers are likely to be damaged and unqualified in the field assembly process, tests including error tests are difficult to carry out on the sleeve type current transformers after the field assembly of the transformers and after the field assembly of the transformers are carried out, the primary conductors of the sleeve type current transformers are transformer sleeves, the transformer sleeves are connected with transformer windings, the rated primary currents of the sleeve type current transformers are still large, high power is needed for reaching the rated currents, and the testing system cannot provide the high power. Generally, small-power test equipment such as a CT analyzer and the like is adopted to carry out field test by adopting an indirect method, when error test is carried out, the error of a test system body is large, a test result cannot prove whether the error of the current transformer is qualified, and meanwhile, some defects can not be found due to small primary current. If the bushing type current transformer body is damaged, a series of complex operations such as oil drainage, lifting out of a bushing of the transformer, opening of a lifting seat of the transformer, lifting out of the bushing type current transformer and the like are needed to be carried out on the transformer when repairing or replacing the bushing type current transformer body, a large amount of manpower, material resources and financial resources are needed, and if the bushing type current transformer body is not damaged, the bushing type current transformer body does not need to be repaired or replaced, so that a large amount of manpower, material resources and financial resources are saved.
Disclosure of Invention
The invention aims to provide a transformer lifting seat structure with a current transformer test lead and a test method, which are convenient for testing a sleeve type current transformer in a transformer lifting seat on site, can conveniently carry out tests such as errors and the like on the sleeve type current transformer by applying primary current to two leading-out terminals of the test lead, judge whether the sleeve type current transformer is qualified or not, avoid directly hanging the sleeve type current transformer out for inspection, save a large amount of manpower, material resources and financial resources and solve the problems in the background technology.
The technical scheme of the invention is as follows:
a transformer lifting seat structure with a current transformer test wire comprises an upper flange, a small sleeve I, a sleeve type current transformer, a test wire, a grounding bolt, a lifting seat wall, a lower flange, a secondary outlet box and a small sleeve II; the sleeve type current transformers are arranged in the lifting seat wall between the upper flange and the lower flange, and the plurality of sleeve type current transformers are concentrically arranged up and down in the lifting seat wall; a small sleeve I, a small sleeve II, a secondary outlet box and a grounding bolt are arranged on the wall of the lifting seat, and the secondary outlet box is connected with a secondary outlet wire of the sleeve type current transformer; the test lead is led out from the upper end face of the multiple sleeve type current transformers through the inner diameter side of the transformers, namely the test lead passes through the inner parts of all the sleeve type current transformers, and two ends of the test lead are led out of the lifting seat wall through the small sleeve I and the small sleeve II respectively to form two test wiring terminals; two protective covers are arranged outside the wall of the lifting seat, and the exposed parts of the small sleeve I and the small sleeve II on the wall of the lifting seat are positioned in the respective protective covers; when the transformer normally operates, one of the test terminals on the small sleeve I and the small sleeve II is connected with the grounding bolt through a lead wire and is grounded.
The test wire is a copper or aluminum wire with an insulating layer, has the current interception capability and is used for passing once large current when performing tests such as current transformer errors.
The small bushing is much smaller than the transformer bushing size.
The inner diameter side of the mutual inductor of the plurality of sleeve type current mutual inductors is provided with an assembling space of the test lead, and the assembling space of the test lead needs to be reserved by considering the inner diameter size during design. An assembling space of the small sleeve I and the small sleeve II is arranged in the wall of the lifting seat, and the assembling space of the small sleeve I and the small sleeve II is reserved when the lifting seat is designed.
The exposed parts of the first small sleeve and the second small sleeve are provided with protective covers for protecting against sunshine and rain, and the lengths of the wires are tested and cut and fixed; and the secondary outlet box is used for leading out a secondary wire of the sleeve type current transformer.
The upper flange is connected with the transformer bushing flange to play a role in supporting and fixing the transformer bushing; the lower flange is connected with the transformer oil tank.
A method for testing a bushing type current transformer in a transformer lifting seat on site adopts the transformer lifting seat structure, and comprises the following steps:
after the transformer is installed or in the process of maintenance after operation, when the bushing type current transformer needs to be tested, a lead wire connected with a grounding bolt is opened, and secondary outgoing wires of the other bushing type current transformers except one bushing type current transformer needing to be tested are in short circuit; connecting two testing terminals of a testing wire into a testing system, loading specified primary current, and performing error test and turn-to-turn overvoltage test on the sleeve type current transformer without short circuit of a secondary outgoing line; completing error tests and turn-to-turn overvoltage tests of all sleeve type current transformers in sequence; analyzing the test results of all the bushing type current transformers to judge whether the bodies of the bushing type current transformers are qualified or not and whether the bodies of the bushing type current transformers are damaged or not; if the current transformer is unqualified or damaged, the sleeve type current transformer needs to be lifted out for repair and replacement; if the sleeve type current transformer is not damaged, the sleeve type current transformer does not need to be hung out for repair and replacement; after the test is finished, any one of the test terminals on the small sleeve I and the small sleeve II is connected with the grounding bolt through the lead wire to be grounded, and the transformer can normally run.
When the transformer normally operates, one of the test terminals on the first small sleeve and the second small sleeve is connected with the grounding bolt through the lead wire to be grounded, so that the test lead is prevented from inducing voltage and generating discharge phenomena at positions of a raised seat wall and the like.
The invention has the beneficial effects that: set up a bushing type current transformer in advance inside transformer rising seat and experimental with a test wire (take the insulating layer), through applying a current to two leading-out terminals of test wire, can conveniently carry out error test and interturn overvoltage test to bushing type current transformer, the problem that bushing type current transformer is experimental difficult and test error is big after the transformer assembly is accomplished has been solved well, can judge well whether bushing type current transformer is qualified, avoid directly hanging out bushing type current transformer and inspect, if bushing type current transformer body is qualified, can save a large amount of manpowers, material resources and financial resources.
Drawings
FIG. 1 is a structural overall view of the present invention;
in the figure: the device comprises an upper flange 1, a protective cover 2, a small bushing I3, a bushing type current transformer 4, a test lead 5, a lead 6, a grounding bolt 7, a lifting seat wall 8, a lower flange 9, a secondary outlet box 10, a small bushing II 11 and a transformer inner diameter side 12.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A transformer lifting seat structure with a current transformer test wire comprises an upper flange 1, a small sleeve I3, a sleeve type current transformer 4, a test wire 5, a grounding bolt 7, a lifting seat wall 8, a lower flange 9, a secondary outlet box 10 and a small sleeve II 11; the sleeve type current transformers 4 are arranged inside a lifting seat wall 8 between the upper flange 1 and the lower flange 9, and the plurality of sleeve type current transformers 4 are concentrically arranged in the lifting seat wall 8 from top to bottom; a small sleeve I3, a small sleeve II 11, a secondary outlet box 10 and a grounding bolt 7 are arranged on the lifting seat wall 8, and the secondary outlet box 10 is connected with a secondary leading line of the sleeve type current transformer 4; the test lead 5 is led out from the upper end face of a plurality of sleeve type current transformers through the inner diameter side 12 of the transformer and from the lower end face of the sleeve type current transformers, namely the test lead 5 passes through the inner parts of all the sleeve type current transformers, and two ends of the test lead 5 are led out to the outside of the lifting seat wall 8 through the small sleeve I3 and the small sleeve II 11 respectively to form two test terminals; two protective covers 2 are arranged outside the lifting seat wall 8, and the small sleeve I3 and the small sleeve II 11 are positioned in the respective protective covers at the exposed part of the lifting seat wall 8; when the transformer operates normally, one of the test terminals on the small sleeve I3 and the small sleeve II 11 is connected with the grounding bolt 7 through the lead 6 to be grounded.
The test wire 5 is a copper or aluminum wire with an insulating layer, has the current-intercepting capability and is used for passing once large current when a current transformer error test and an inter-turn overvoltage test are carried out.
The inner diameter side 12 of the plurality of bushing type current transformers 4 is provided with an assembling space of the test lead 5, and the assembling space of the test lead 5 needs to be reserved by considering the inner diameter size during design. The inner part of the lifting seat wall 8 is provided with an assembly space of the small sleeve I3 and the small sleeve II 11, and the assembly space of the small sleeve I3 and the small sleeve II 11 is reserved when the lifting seat is designed.
The exposed parts of the small sleeve I3 and the small sleeve II 11 are provided with a protective cover for protecting against sunshine and rain, and the length of the test lead is matched, cut and fixed; and the secondary outlet box is used for leading out a secondary wire of the sleeve type current transformer.
The upper flange 1 is connected with a transformer bushing flange and plays a role in supporting and fixing a transformer bushing; the lower flange 9 is connected with the transformer oil tank.
A method for testing a bushing type current transformer in a transformer lifting seat on site adopts the transformer lifting seat structure, and comprises the following steps:
after the transformer is installed or in the process of maintenance after operation, when the bushing type current transformer needs to be tested, the lead 6 connected with the grounding bolt 7 is opened, and the secondary outgoing lines of the rest bushing type current transformers except for one bushing type current transformer needing to be tested are in short circuit; connecting two testing terminals of a testing wire 5 into a testing system, loading specified primary current, and performing error test and turn-to-turn overvoltage test on the sleeve type current transformer without short circuit of a secondary outgoing line; completing error tests and turn-to-turn overvoltage tests of all sleeve type current transformers in sequence; analyzing the test results of all the bushing type current transformers 4 to judge whether the bodies of the bushing type current transformers 4 are qualified or damaged; if the current transformer is unqualified or damaged, the sleeve type current transformer 4 needs to be lifted out for repair and replacement; if the sleeve type current transformer 4 is not damaged, the sleeve type current transformer 4 does not need to be hung out for repair and replacement; after the test is finished, one of the test terminals on the first small sleeve 3 and the second small sleeve 11 is connected with the grounding bolt 7 through the lead 6 to be grounded, and the transformer can normally operate.
When the transformer normally operates, one of the test terminals on the first small sleeve 3 and the second small sleeve 11 is connected with the grounding bolt 7 through the lead 6 to be grounded, so that the test lead 5 is prevented from inducing voltage and generating discharge phenomena at the positions of a raised seat wall and the like.
In the embodiment, the test wire 5 is a copper or aluminum wire with an insulating layer, and the wire hasA certain current-cut-off capacity, when a large current passes through the test wire for testing the error of the current transformer, and the like, if the rated primary current of the sleeve-type current transformer 4 is 2500A, the cross section area of the test wire 5 can be 100mm2And 3mm of insulating thickness on each side of the paper-covered flexible copper cable, the diameter of the paper-covered flexible copper cable is 21.7mm, and the length of the test lead 5 is matched, cut and fixed. The bushing type current transformer 4 needs to be designed with the inner diameter size taken into consideration to leave an assembly space for the test lead 5. And a small sleeve I3 and a small sleeve II 11 are arranged in the lifting seat. And the exposed parts of the small sleeve I3 and the small sleeve II 11 are provided with a protective cover 2 for protecting against sunshine and rain. One of the small sleeve 3 and the small sleeve 11 is connected with the grounding bolt 7 by a lead 6 and is used for grounding, so that the test lead 5 is prevented from inducing voltage and generating discharge phenomena at the positions of a raised seat wall and the like. The upper flange 1 is connected with a transformer bushing flange to play a role in supporting and fixing the transformer bushing. The bushing type current transformer 4 converts a large current on a high-voltage side into a small current on a low-voltage side for measurement or protection. The secondary outlet box 10 is used for leading out a secondary wire of the bushing type current transformer 4. The lower flange 9 is used for mounting with a transformer tank. When the bushing type current transformer 4 needs to be tested, the lead 6 is disconnected with the first small bushing 3 and the second small bushing 11, the test lead 5 is connected into a test system to apply a specified primary current, tests such as errors are conducted, and the lead 6 is connected with one of the first small bushing 3 and the second small bushing 11 and then grounded after the tests are completed. Through analyzing the test result of the bushing type current transformer 4, whether the body of the bushing type current transformer 4 is qualified or damaged can be judged, if the body is unqualified or damaged, the bushing type current transformer 4 needs to be lifted out for repairing and replacing, if the body is not damaged, the bushing type current transformer 4 does not need to be lifted out for repairing and replacing, and a large amount of manpower, material resources and financial resources are saved.
Claims (4)
1. The utility model provides a take transformer of current transformer test wire to rise a structure which characterized in that: the device comprises an upper flange (1), a small bushing I (3), a bushing type current transformer (4), a test lead (5), a grounding bolt (7), a lifting seat wall (8), a lower flange (9), a secondary outlet box (10) and a small bushing II (11); the sleeve type current transformers (4) are arranged in the lifting seat wall (8) between the upper flange (1) and the lower flange (9), and the plurality of sleeve type current transformers (4) are concentrically arranged in the lifting seat wall (8) from top to bottom; a small sleeve I (3), a small sleeve II (11), a secondary outlet box (10) and a grounding bolt (7) are arranged on the lifting seat wall (8), and the secondary outlet box (10) is connected with a secondary outlet wire of the sleeve type current transformer (4); the test lead (5) is led out from the upper end face of a plurality of bushing type current transformers through the inner diameter side (12) of the transformer and from the lower end face of the bushing type current transformer, namely the test lead (5) penetrates through the interiors of all the bushing type current transformers, and two ends of the test lead (5) are led out of the lifting seat wall (8) through the small bushing I (3) and the small bushing II (11) respectively to form two test terminals; two protective covers (2) are arranged outside the lifting seat wall (8), and the small sleeve I (3) and the small sleeve II (11) are positioned in the respective protective covers at the exposed part of the lifting seat wall (8); when the transformer normally operates, any one of the test terminals on the small sleeve I (3) and the small sleeve II (11) is connected with the grounding bolt (7) through the lead (6) and grounded.
2. The transformer lifting seat structure with the current transformer test wire according to claim 1, characterized in that: the test lead (5) is a copper or aluminum lead with an insulating layer, has the current interception capability and is used for passing primary current when a current transformer error test and an inter-turn insulation test are carried out.
3. The transformer lifting seat structure with the current transformer test wire according to claim 1, characterized in that: the inner diameter side (12) of the sleeve type current transformers (4) is provided with an assembly space for testing the lead (5), and the inner part of the lifting seat wall (8) is provided with an assembly space for a small sleeve I (3) and a small sleeve II (11).
4. A method of field testing a bushing-type current transformer in a transformer riser, using the transformer riser structure as defined in any one of claims 1-3, comprising the steps of:
after the transformer is installed or in the process of maintenance after operation, when the bushing type current transformer needs to be tested, a lead (6) connected with a grounding bolt (7) is opened, and secondary outgoing lines of the other bushing type current transformers except one bushing type current transformer needing to be tested are in short circuit connection; connecting two testing terminals of a testing wire (5) into a testing system, loading specified primary current, and performing error test and turn-to-turn overvoltage test on the sleeve type current transformer without short circuit of a secondary outgoing line; completing error tests and turn-to-turn overvoltage tests of all sleeve type current transformers in sequence; analyzing the test results of all the bushing type current transformers (4) to judge whether the bodies of the bushing type current transformers (4) are qualified or not and whether the bodies of the bushing type current transformers (4) are damaged or not; if the current transformer is unqualified or damaged, the sleeve type current transformer (4) needs to be lifted out for repair and replacement; if the current transformer is not damaged, the sleeve type current transformer (4) does not need to be hung out for repair and replacement; after the test is finished, any one of the test terminals on the small sleeve I (3) and the small sleeve II (11) is connected with the grounding bolt (7) through the lead (6) to be grounded, and the transformer can normally operate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110636308.5A CN113376563B (en) | 2021-06-08 | 2021-06-08 | Transformer lifting seat structure with current transformer test wire and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110636308.5A CN113376563B (en) | 2021-06-08 | 2021-06-08 | Transformer lifting seat structure with current transformer test wire and test method |
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| CN113376563A true CN113376563A (en) | 2021-09-10 |
| CN113376563B CN113376563B (en) | 2022-08-12 |
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| CN103809146A (en) * | 2013-12-02 | 2014-05-21 | 国家电网公司 | Test method of main transformer CT (Current Transformer) |
| CN105319478A (en) * | 2014-06-30 | 2016-02-10 | 国家电网公司 | Un-disassembly polarity and transformation ratio testing method for transformer bushing |
| CN105548847A (en) * | 2016-02-03 | 2016-05-04 | 国网电力科学研究院武汉南瑞有限责任公司 | Multi-structure high voltage bushing performance examination detection platform and a test method |
| CN205487670U (en) * | 2016-01-08 | 2016-08-17 | 中国南方电网有限责任公司超高压输电公司 | Converter transformer iron core ground structure |
| CN110676012A (en) * | 2019-09-19 | 2020-01-10 | 南方电网科学研究院有限责任公司 | Sleeve wire outlet device, transformer, reactor and sleeve fault judgment method |
| CN112526412A (en) * | 2020-11-17 | 2021-03-19 | 国网湖南省电力有限公司 | Method and system for testing polarity of current transformer of transformer lifting seat |
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2021
- 2021-06-08 CN CN202110636308.5A patent/CN113376563B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692115A (en) * | 2009-09-23 | 2010-04-07 | 河南省电力公司商丘供电公司 | Polarity tester for current transformer at transformer neutral point |
| CN101944719A (en) * | 2010-08-20 | 2011-01-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Detection system and detection method of capacitance sleeve pipe and current transformer |
| CN103809146A (en) * | 2013-12-02 | 2014-05-21 | 国家电网公司 | Test method of main transformer CT (Current Transformer) |
| CN105319478A (en) * | 2014-06-30 | 2016-02-10 | 国家电网公司 | Un-disassembly polarity and transformation ratio testing method for transformer bushing |
| CN205487670U (en) * | 2016-01-08 | 2016-08-17 | 中国南方电网有限责任公司超高压输电公司 | Converter transformer iron core ground structure |
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| CN113376563B (en) | 2022-08-12 |
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