CN203617104U - Lightning arrester structure for balancing winding grounding - Google Patents
Lightning arrester structure for balancing winding grounding Download PDFInfo
- Publication number
- CN203617104U CN203617104U CN201320861970.1U CN201320861970U CN203617104U CN 203617104 U CN203617104 U CN 203617104U CN 201320861970 U CN201320861970 U CN 201320861970U CN 203617104 U CN203617104 U CN 203617104U
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- Prior art keywords
- lightning arrester
- balancing
- earth
- cable
- transformer
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- 238000004804 winding Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Abstract
The utility model relates to a lightning arrester structure for balancing winding grounding, which belongs to the technical field of transformer equipment. According to the technical scheme, a lightning arrester (1) is arranged outside a balancing sleeve (9) and arranged on the outer wall of a balancing lifting base (10) through a first fixed plate (4), the balancing sleeve (9) is provided with two sleeve terminals (12) which are connected with the upper terminal of the lightning arrester (1) through a cable (3) after being short-circuited by a short-circuiting plate (2), and the lower terminal of the lightning arrester (1) is connected with a discharge counter (5) through a cable and then connected with the ground through a grounding lead (6) and a grounding bolt (7). The lightning arrester structure is light and small, solves the problems once for all, cannot bring excessive additional cost and alteration cost, and provides convenience for the later operation of a transformer; the lightning arrester structure solves the problem of voltage shift in the low-voltage neutral point of a Y/Y-Delta connected transformer, thus eliminating potential hazards in the safe operation of a power system and enhancing the stability of the system, and the effect is good.
Description
Technical field
The utility model relates to a kind of lightning arrester structure for balance winding earth, belongs to transformer equipment technical field.
Background technology
Along with the development of electric power system, the capacity of transformer is increasing, and its structure is also increasingly sophisticated, and former 500kV threephase generator transformer mostly is Y/ delta connection, and low-pressure side adopts delta connection, both can electric energy transmitting, also can eliminate triple-frequency harmonics.But the full star of present many 500kV threephase generator transformer adopting high and low pressure sides connects the connection that adds again balance winding, its objective is that the voltage-phase in order to make the output of 500kV 35 kV-side of transformer is identical with 220kV 35 kV-side of transformer output voltage phase place, thereby be convenient to dispatching of power netwoks, improve the stability of system.Balance winding adopts delta connection, is specifically designed to elimination triple-frequency harmonics.
But when the operation of this type of transformer, if the direct one point earth of balance winding, can bring impact to other winding operation of transformer, in the time that low-pressure side does not connect load, low pressure neutral point voltage is mainly produced by interwinding capacity inductive coupling by other winding voltage.When adopting direct grounding way after balancing sleeve terminal N1, N2 short circuit, as at high voltage supply, when low-pressure side is unloaded, due to low pressure isolated neutral, cause low pressure winding three-phase capacitive unbalance to earth, thereby occur the displacement of low pressure neutral point voltage, be i.e. low pressure winding three-phase voltage to earth imbalance when zero load, when serious, can make the neutral point displacement voltage of low pressure winding exceed the value of rules regulation, bring hidden danger to the safe operation of system.
Utility model content
The utility model object is to provide a kind of lightning arrester structure for balance winding earth, meeting under the prerequisite of product insulation safety reliability, three-phase equilibrium winding completes corner connection and draws after short circuit by two sleeve pipes in transformer inside, pass through again a gapless metal-oxide lighting arrester by balancing sleeve ground connection nearby, thereby control neutral point displacement voltage within the allowed band of rules, reduce the impact of the direct ground connection of balance winding on low pressure winding, solved the problems referred to above that exist in background technology.
The technical solution of the utility model is: a kind of lightning arrester structure for balance winding earth, comprise lightning arrester, short-circuit board, cable, fixed head one, discharge counter, ground lead, earth stud and fixed head two, described lightning arrester is arranged on the outside of balancing sleeve, be arranged on by fixed head one on the outer wall of balance rising seat, balancing sleeve is provided with two conduit connection terminals, upper end binding post by cable and lightning arrester after short-circuit board short circuit is connected to each other, the lower end binding post of lightning arrester is connected to each other by cable and discharge counter, then pass through ground lead, earth stud is communicated with the earth.
The material of described lightning arrester is gapless metal-oxide.
Described discharge counter is arranged on the position of being convenient to observation in the outer limit of tank wall reinforcement iron by fixed head two.
The beneficial effects of the utility model are: simple in structure, be convenient to install and operation; After the corner connection of balance winding, by arrester ground, low pressure end voltage to earth unbalance factor is greatly improved, has dropped to 2.3% from 18.4%, make interwinding capacity three-phase basic identical, low pressure neutral point position no longer produces larger movement; The utility model light small and exquisite, put things right once and for all, thoroughly solved problem, can not bring too much fringe cost and improvement cost yet, the operation later for transformer provides convenience; Solve the problem of Y/Y-△ connection transformer low pressure neutral point voltage displacement, eliminated the hidden danger that affects safe operation of power system, improved the stability of system, respond well.
Accompanying drawing explanation
Fig. 1 is lightning arrester and sleeve pipe connection diagram;
Fig. 2 is arrester ground and discharge counter schematic diagram;
Fig. 3 is elementary diagram of the present utility model;
In figure: lightning arrester 1; Short-circuit board 2; Cable 3; Fixed head 1; Discharge counter 5; Ground lead 6; Earth stud 7; Fixed head 28; Balancing sleeve 9; Balance rising seat 10; Tank wall is strengthened the outer limit 11 of iron; Conduit connection terminal 12; The outer limit 13 of tank wall.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.
A kind of lightning arrester structure for balance winding earth, comprise lightning arrester 1, short-circuit board 2, cable 3, fixed head 1, discharge counter 5, ground lead 6, earth stud 7 and fixed head 28, described lightning arrester 1 is arranged on the outside of balancing sleeve 9, be arranged on by fixed head 1 on the outer wall of balance rising seat 10, balancing sleeve 9 is provided with two conduit connection terminals 12, after short-circuit board 2 short circuits, be connected to each other by cable 3 and the upper end binding post of lightning arrester 1, the lower end binding post of lightning arrester 1 is connected to each other by cable 3 and discharge counter 5, then by ground lead 6, earth stud 7 is communicated with the earth.
The material of described lightning arrester 1 is gapless metal-oxide.
Described discharge counter 5 is arranged on the position of being convenient to observation in the outer limit of tank wall reinforcement iron by fixed head 28.
For solving low voltage three-phase voltage to earth energy imbalance, balancing sleeve is drawn after short circuit again by gapless metal-oxide lighting arrester ground connection nearby.Gapless metal-oxide lighting arrester is a kind of using non-linear metal oxide resistor as its groundwork element, and does not use the lightning arrester of any discharging gap.This resistance has good non-linear voltage-current characteristic, under normal working voltage, is high resistance.At high voltage supply, when low-pressure side is unloaded, balancing sleeve ground connection is equivalent to be in disconnection suspended state, and therefore the electric capacity three-phase between winding is basic identical, no longer occurs the displacement of low pressure neutral point voltage.
Table 1
From the appearance, the utility model is simple in structure, is convenient to install and operation; From effect, through the checking of table 1 Experimental Comparison, after the corner connection of balance winding, by arrester ground, low pressure end voltage to earth unbalance factor is greatly improved, drop to 2.3% from 18.4%, make interwinding capacity three-phase basic identical, low pressure neutral point position no longer produces larger movement; From economic benefit, the utility model light small and exquisite, put things right once and for all, thoroughly solved problem, can not bring too much fringe cost and improvement cost yet, the operation later for transformer provides convenience; The utility model has solved the problem of Y/Y-△ connection transformer low pressure neutral point voltage displacement, has eliminated the hidden danger that affects safe operation of power system, has improved the stability of system, respond well.
Claims (3)
1. the lightning arrester structure for balance winding earth, it is characterized in that: comprise lightning arrester (1), short-circuit board (2), cable (3), fixed head one (4), discharge counter (5), ground lead (6), earth stud (7) and fixed head two (8), described lightning arrester (1) is arranged on the outside of balancing sleeve (9), be arranged on by fixed head one (4) on the outer wall of balance rising seat (10), balancing sleeve (9) is provided with two conduit connection terminals (12), after short-circuit board (2) short circuit, be connected to each other by cable (3) and the upper end binding post of lightning arrester (1), the lower end binding post of lightning arrester (1) is connected to each other by cable (3) and discharge counter (5), then by ground lead (6), earth stud (7) is communicated with the earth.
2. a kind of lightning arrester structure for balance winding earth according to claim 1, is characterized in that: the material of described lightning arrester (1) is gapless metal-oxide.
3. a kind of lightning arrester structure for balance winding earth according to claim 1, is characterized in that: described discharge counter (5) is arranged on tank wall reinforcement iron by fixed head two (8) and limits the position of being convenient to observation on (11) outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320861970.1U CN203617104U (en) | 2013-12-25 | 2013-12-25 | Lightning arrester structure for balancing winding grounding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320861970.1U CN203617104U (en) | 2013-12-25 | 2013-12-25 | Lightning arrester structure for balancing winding grounding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203617104U true CN203617104U (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320861970.1U Expired - Lifetime CN203617104U (en) | 2013-12-25 | 2013-12-25 | Lightning arrester structure for balancing winding grounding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203617104U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104112574A (en) * | 2014-06-29 | 2014-10-22 | 国家电网公司 | Low-voltage lightning arrester installation support of amorphous alloy transformer |
| CN108899178A (en) * | 2018-06-13 | 2018-11-27 | 卧龙电气银川变压器有限公司 | A kind of outgoing line device of power transformer balance winding |
| CN108988365A (en) * | 2018-07-25 | 2018-12-11 | 国家电投集团黄河上游水电开发有限责任公司 | A kind of large capacity split-phase type Three-Phase Transformer balance winding outside staggered connection method |
-
2013
- 2013-12-25 CN CN201320861970.1U patent/CN203617104U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104112574A (en) * | 2014-06-29 | 2014-10-22 | 国家电网公司 | Low-voltage lightning arrester installation support of amorphous alloy transformer |
| CN108899178A (en) * | 2018-06-13 | 2018-11-27 | 卧龙电气银川变压器有限公司 | A kind of outgoing line device of power transformer balance winding |
| CN108988365A (en) * | 2018-07-25 | 2018-12-11 | 国家电投集团黄河上游水电开发有限责任公司 | A kind of large capacity split-phase type Three-Phase Transformer balance winding outside staggered connection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140528 |
|
| CX01 | Expiry of patent term |