CN106226564B - Routine test transfer box for high-voltage capacitance type voltage transformer without disassembling lead - Google Patents
Routine test transfer box for high-voltage capacitance type voltage transformer without disassembling lead Download PDFInfo
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- CN106226564B CN106226564B CN201610673250.0A CN201610673250A CN106226564B CN 106226564 B CN106226564 B CN 106226564B CN 201610673250 A CN201610673250 A CN 201610673250A CN 106226564 B CN106226564 B CN 106226564B
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- 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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- 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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Abstract
The invention discloses a high-voltage capacitance type voltage transformer routine test transfer box without disassembling a lead, and relates to the technical field of power voltage transformer tests. The switching box comprises a box body and a main panel on the upper surface of the box body, wherein equipment binding posts of the main panel are connected with tested equipment through insulated wires, and instrument binding posts are connected with a tester through test wires matched with the tester. The change-over switch of the main panel operation area can switch the wire connection mode of the inner space of the box body, thereby realizing the purpose of completing two test modes without disconnecting the wire. The switching box has the advantages of convenience in carrying, simplicity in operation, reliability and safety, so that the ascending and wiring times of operators are reduced, and the routine test efficiency of the CVT is improved.
Description
Technical Field
The invention relates to the technical field of power voltage transformer tests.
Background
In a power system with the voltage class of 110kV and above, the traditional electromagnetic voltage transformer is easy to generate resonance overvoltage with a breaker fracture voltage-sharing capacitor, so that a Capacitive Voltage Transformer (CVT) is adopted for a newly-built or modified open type transformer substation according to regulations. The working principle of the capacitive voltage transformer is that the series capacitor is used for voltage division firstly, and then the voltage is reduced and isolated through the electromagnetic voltage transformer. To ensure safe and normal operation of the CVT, routine tests are regularly performed on the CVT, and the routine test items mainly include measurement of insulation resistance of each internal part and measurement of capacitance and dielectric loss. The measurement of capacitance and dielectric loss is one of important parameters for judging the insulating state of CVT, and can effectively reflect a series of defects of water inlet wetting, insulating aging and the like of equipment. Since the CVT has both a capacitive voltage dividing unit and an electromagnetic unit inside, the structure is complex, which determines that two steps are required for measuring CVT capacitance and dielectric loss.
In a transformer substation test site, a tester needs to wear a safety belt ladder to ascend, a safety belt hook or rope is hung on a CVT supporting framework, then the CVT secondary panel is detached and tested, and after the operator gets off the ladder and transfers to a safety position, the tester performs a first step of test. After the first step of test operation is completed, the operator needs to ascend the ladder again to ascend a height to switch the test line, and then descend the ladder after the operation is completed to perform the second step of test. After the second step is completed, the climber needs to get up again to remove the test wiring, and the CVT secondary panel is restored to the initial state.
The operators in the first step and the second step of the test step need to ascend the ladder, fix the safety belt and switch test wiring, and in addition, according to relevant regulations, the operation of ascending the height by using the ladder needs to ascend the height by one person. Therefore, the conventional CVT routine test is low in efficiency, and the working progress of the overall routine test of the transformer substation is affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-voltage capacitor type voltage transformer routine test switching box without disassembling the lead, which has the effects of convenient carrying, simple operation, reliability and safety, thereby reducing the ascending and wiring times of operators and improving the CVT routine test efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme: the high-voltage capacitance type voltage transformer routine test switching box is characterized by comprising a box body and a main panel, wherein the box body is made of insulating materials;
the main panel is provided with an operation area, an equipment area and an instrument area; the operation area comprises an alternating current ammeter and a change-over switch for switching the connection mode in the box body; four device binding posts used for connecting tested devices are arranged in the device area, namely a first device binding post, a second device binding post, a third device binding post and a fourth device binding post; four instrument binding posts used for connecting a testing instrument are arranged in the instrument area, namely a first instrument binding post, a second instrument binding post, a third instrument binding post and a fourth instrument binding post;
the inner space of the box body is provided with a wire for connecting the equipment binding post, the instrument binding post, the alternating current meter and the change-over switch: the first instrument binding post is connected with the first equipment binding post, the second instrument binding post is connected with one end of the alternating current meter, the other end of the alternating current meter is connected with the third equipment binding post, and the third instrument binding post is connected with the fourth equipment binding post;
the change-over switch comprises a first gear, a second gear and a third gear, and the first gear connects the first equipment binding post with the second equipment binding post; the second gear connects the second equipment binding post with the fourth instrument binding post; the third gear is a closing gear.
Preferably, the high voltage is 220kV or more.
Preferably, the withstand voltage level of the equipment terminal and the instrument terminal reaches 3kV; the voltage withstand level of the lead wire connected with the first instrument binding post and the first equipment binding post reaches 3kV; the voltage-resistant level of the lead wire connected with the first equipment binding post and the second equipment binding post reaches 3kV.
Preferably, the alternating current ammeter is a mechanical pointer type ammeter with a measuring range of 50A.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the equipment binding post of the main panel is connected with the tested equipment through an insulated wire, and the instrument binding post is connected with the tester through a test wire matched with the tester. The change-over switch of the main panel operation area can change the wire connection mode of the inner space of the box body, thereby realizing the purpose of completing two test modes without disconnecting the wire. The switching box is convenient to carry, simple to operate, practical and safe, reduces ascending and ascending times and wiring times of testers, optimizes the whole test flow, and improves routine test efficiency of the CVT.
Drawings
FIG. 1 is a schematic view of a main panel structure of an upper surface of a case according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the wiring pattern of the space wires in the case of the embodiment of fig. 1.
In the figure: 1. an operation region; 2. an equipment area; 3. an instrument area; 4. an alternating current ammeter; 5. a change-over switch; 51. a first gear; 52. a second gear; 53. a third gear; 6. a device terminal; 61. a first device terminal; 62. a second device terminal; 63. a third device terminal; 64. a fourth device terminal; 7. an instrument binding post; 71. a first instrument post; 72. a second instrument post; 73. a third instrument post; 74. and a fourth instrument binding post.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an embodiment of a routine test switching box for a high-voltage capacitive voltage transformer according to the present invention is shown. In this embodiment, the adapter box includes a box body and a main panel, and the box body is made of an insulating material. The main panel is provided with three areas of an operation area 1, an equipment area 2 and an instrument area 3. The operation area 1 includes an ac ammeter 4 and a change-over switch 5 for switching the connection mode in the case. Four device binding posts 6 for connecting the tested device are arranged in the device area 2, namely a first device binding post 61, a second device binding post 62, a third device binding post 63 and a fourth device binding post 64; four instrument terminals for connecting the test instrument are provided in the instrument area, namely a first instrument terminal 71, a second instrument terminal 72, a third instrument terminal 73 and a fourth instrument terminal 74.
In one embodiment, the box body is a hollow cuboid, and six sides are insulators. As shown in fig. 1, four device binding posts 6 in the device area 2 on the left side of the main panel are respectively named as "N", "X", "da" and "dn", and are respectively connected with the same name end of the secondary terminal of the tested device by insulated wires when in use. Four instrument binding posts 7 in the equipment area 3 on the right side of the main panel are respectively named as 'Cx', 'CVT+', 'CVT-' and a grounding end in sequence, and are connected with terminals with the same name of the tester through test wires matched with the tester when the tester is used. The withstand voltage level of the equipment terminal 6 and the instrument area terminal 7 reaches 3kV, and the eight terminals are required to be conventional terminals capable of withstanding 3kV ac voltage for a long time. The ac ammeter 4 in the main panel operating area 1 is a mechanical pointer type, and the measuring range is 50A, which is used for monitoring the current condition of the wire in the second test step, so as to avoid burning the testing instrument due to overlarge current in the second test step. The adapter box is particularly suitable for routine tests of capacitance type voltage transformers of 220kV and above power line voltage levels of 220kV, 330kV, 500kV and the like.
As shown in fig. 2, the wire connection mode of the space in the box body in the embodiment of fig. 1 is shown. The lead wire connection mode of the inner space of the box body is that the first instrument binding post 71 is connected with the first equipment binding post 61; the second instrument binding post 72 is connected with one end of an alternating current ammeter, and the other end of the alternating current ammeter is connected with the third equipment binding post 63; the third instrument post 73 is connected to the fourth device post 64. Wherein the wire withstand voltage level between the first instrument post 71 and the first device post 61 reaches 3kV. And the wire withstand voltage level between the first device terminal 61 and the second device terminal 62 reaches 3kV. The rest of the internal wires are common insulated wires. Ac ammeter 4 is coupled in series between the "da" and "cvt+" terminals.
The change-over switch 5 for switching the connection mode inside the case includes a first gear 51, a second gear 52, and a third gear 53, the first gear 51 connecting the first device terminal 61 and the second device terminal 62. The second gear 52 connects the second device post 62 with the fourth instrument post 74. The third gear 53 is a closing gear. As shown in fig. 2, the three gear names of the change-over switch 5 are "a" gear 51, "B" gear 52 and "OFF" gear 53, respectively, for realizing the wire conversion between the two test steps: when the change-over switch 5 is switched to the "a" gear 51, a first step "shielding method" test of the test can be performed; when the change-over switch 5 is switched to the "B" gear 52, a second step "self-excitation method" test of the test can be performed; when the change-over switch 5 is switched to the "OFF" gear 53, no test is performed.
At the routine test site of the transformer substation high-voltage CVT, a tester firstly ascends to ascend, removes the CVT secondary panel and safely and firmly connects all secondary terminals used in the test to the equipment area 2 of the test transfer box by using customized leads. The tester is connected to the instrument area 3 of the junction box using test wires that are complementary to the tester itself. The first test of the test is performed by switching the knob of the change-over switch 5 from the "OFF" gear 53 to the "a" gear 51. After completion, the knob of the change-over switch 5 is switched from the "a" gear 51 to the "B" gear 52, and a second test of the test is performed. And finally, switching the knob of the change-over switch 5 from the 'B' gear 52 to the 'OFF' gear 53, removing the connection between the change-over box and the CVT and the connection between the change-over box and the testing instrument, and lifting by a tester to restore the CVT secondary panel to an initial state to complete the whole test.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the equipment binding post of the main panel is connected with the tested equipment through an insulated wire, and the instrument binding post is connected with the tester through a test wire matched with the tester. The change-over switch of the main panel operation area can change the wire connection mode of the inner space of the box body, thereby realizing the purpose of completing two test modes without disconnecting the wire. The switching box is convenient to carry, easy to operate, practical and safe, reduces the ascending and wiring times of experimenters, optimizes the whole test flow, and improves the routine test efficiency of the CVT.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. The high-voltage capacitance type voltage transformer routine test switching box is characterized by comprising a box body and a main panel, wherein the box body is made of insulating materials;
the main panel is provided with three areas, namely an operation area (1), an equipment area (2) and an instrument area (3); the operation area (1) comprises an alternating current ammeter (4) and a change-over switch (5) for switching the connection mode in the box body; four device binding posts (6) for connecting tested devices are arranged in the device area (2), namely a first device binding post (61), a second device binding post (62), a third device binding post (63) and a fourth device binding post (64); four instrument binding posts (7) for connecting a testing instrument are arranged in the instrument area (3), namely a first instrument binding post (71), a second instrument binding post (72), a third instrument binding post (73) and a fourth instrument binding post (74); the names of the first equipment binding post (61), the second equipment binding post (62), the third equipment binding post (63) and the fourth equipment binding post (64) are respectively N, X, da and dn in sequence, and are respectively connected with the same name end of the secondary terminal of the tested equipment by insulated wires when in use; the names of the first instrument binding post (71), the second instrument binding post (72), the third instrument binding post (73) and the fourth instrument binding post (74) are respectively Cx, CVT+, "CVT-" and a grounding end in sequence, and the first instrument binding post, the second instrument binding post (72), the third instrument binding post and the fourth instrument binding post (74) are connected with terminals with the same name as the testing instrument through test wires matched with the testing instrument during use;
the inner space of the box body is provided with a wire for connecting the equipment binding post (6), the instrument binding post (7), the alternating current ammeter (4) and the change-over switch (5): the first instrument binding post (71) is connected with the first equipment binding post (61), the second instrument binding post (72) is connected with one end of the alternating current ammeter (4), the other end of the alternating current ammeter (4) is connected with the third equipment binding post (63), and the third instrument binding post (73) is connected with the fourth equipment binding post (64);
the change-over switch (5) comprises a first gear (51), a second gear (52) and a third gear (53), wherein the first gear (51) connects a first equipment binding post (61) and a second equipment binding post (62); a second gear (52) connects the second device terminal (62) and the fourth instrument terminal (74); the third gear (53) is a closing gear;
the voltage withstand level of the equipment binding post (6) and the instrument binding post (7) reaches 3kV; the voltage withstand level of the lead wire connected with the first instrument binding post (71) and the first equipment binding post (61) reaches 3kV; the voltage withstand level of the lead wire connected with the first equipment binding post (61) and the second equipment binding post (62) reaches 3kV.
2. The high voltage capacitive voltage transformer no-lead disassembly routine test transfer box of claim 1, wherein the high voltage is 220kV or more.
3. The high-voltage capacitive voltage transformer routine test switching box without disassembling leads according to claim 1, wherein the alternating current meter (4) is a mechanical pointer type, and the measuring range is 50A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673250.0A CN106226564B (en) | 2016-08-16 | 2016-08-16 | Routine test transfer box for high-voltage capacitance type voltage transformer without disassembling lead |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673250.0A CN106226564B (en) | 2016-08-16 | 2016-08-16 | Routine test transfer box for high-voltage capacitance type voltage transformer without disassembling lead |
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| Publication Number | Publication Date |
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| CN106226564A CN106226564A (en) | 2016-12-14 |
| CN106226564B true CN106226564B (en) | 2023-07-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706970B (en) * | 2017-01-16 | 2023-11-24 | 国家电网公司 | Wiring conversion box for DC resistance test of transformer |
| CN108414796B (en) * | 2018-02-10 | 2020-02-11 | 国家电网公司 | Portable universal adapter box for high-voltage test of transformer |
| CN110488068A (en) * | 2019-08-07 | 2019-11-22 | 国网河北省电力有限公司 | A kind of sampling unit on capacitance type potential transformer |
| CN111239671A (en) * | 2020-03-12 | 2020-06-05 | 国电大渡河检修安装有限公司 | Method for measuring capacitance and dielectric loss value of upper-node coupling capacitor of CVT (constant-Voltage Transformer) |
| CN112710873B (en) * | 2020-11-25 | 2023-03-03 | 深圳供电局有限公司 | Wiring device and testing device |
| CN113759159B (en) * | 2021-09-29 | 2023-12-29 | 国网陕西省电力公司电力科学研究院 | Capacitive voltage transformer with function of outputting capacitive current signals |
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| JP2008216161A (en) * | 2007-03-07 | 2008-09-18 | Tokyo Electric Power Co Inc:The | High pressure terminal block for transformation apparatus test |
| CN203849288U (en) * | 2014-04-30 | 2014-09-24 | 国家电网公司 | Wiring conversion device for electrical routine tests of transformer |
| CN104865415A (en) * | 2015-03-26 | 2015-08-26 | 国网辽宁省电力有限公司抚顺供电公司 | Portable test wiring bench for high-voltage test |
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| CN102095954A (en) * | 2010-12-17 | 2011-06-15 | 青海电力科学试验研究院 | Preventive test method for capacitance voltage transformer free from dismounting lead |
| CN203117297U (en) * | 2013-01-05 | 2013-08-07 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system |
| CN205941623U (en) * | 2016-08-16 | 2017-02-08 | 国家电网公司 | High pressure electric capacity type voltage transformer does not tear open and draws line method routine test switching box |
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2016
- 2016-08-16 CN CN201610673250.0A patent/CN106226564B/en active Active
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| JP2008216161A (en) * | 2007-03-07 | 2008-09-18 | Tokyo Electric Power Co Inc:The | High pressure terminal block for transformation apparatus test |
| CN203849288U (en) * | 2014-04-30 | 2014-09-24 | 国家电网公司 | Wiring conversion device for electrical routine tests of transformer |
| CN104865415A (en) * | 2015-03-26 | 2015-08-26 | 国网辽宁省电力有限公司抚顺供电公司 | Portable test wiring bench for high-voltage test |
Non-Patent Citations (1)
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