CN201608508U - Transformer neutral point rod gap protection device - Google Patents
Transformer neutral point rod gap protection device Download PDFInfo
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- CN201608508U CN201608508U CN2010201020298U CN201020102029U CN201608508U CN 201608508 U CN201608508 U CN 201608508U CN 2010201020298 U CN2010201020298 U CN 2010201020298U CN 201020102029 U CN201020102029 U CN 201020102029U CN 201608508 U CN201608508 U CN 201608508U
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- side electrode
- neutral point
- voltage side
- protection device
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Abstract
The utility model discloses a transformer neutral point rod gap protection device comprising a base, wherein a supporting body and a metal grounding upright are arranged on the base; the supporting body is provided with a high-tension side electrode; the metal grounding upright is provided with a low-tension side electrode; the high-tension side electrode and the low-tension side electrode are positioned at the same horizontal straight line and oppositely arranged; a protection gap with adjustable discharge distance is formed between the high-tension side electrode and the low-tension side electrode; and the metal grounding upright is also provided with a current transformer assembly. The transformer neutral point rod gap protection device integrates all functions on the same one base, thus having compact structure, small occupied space, convenient on-site installation; in addition, the discharge distance of the protection gap of the device is convenient for adjustment, thus being capable of ensuring the stability of gap discharge breakdown voltage and further being applicable to various transformer substations.
Description
Technical field
The utility model relates to the power transmission technology category, and is particularly a kind of at 110kV, the gap protection device that 220kV power transformer neutral point is installed.
Background technology
Stipulate according to the power industry standard DL/T620-1997 of the People's Republic of China (PRC) " overvoltage protection of alternating-current electric device and insulation coordination "; 110kV, 220kV network system belong to useful earthing electric network; the necessary effective grounding of the neutral point of electrical network; promptly the voltage of (greatly) over the ground of neutral point of electric network is " 0 " when actual motion; or approach " 0 "; the ground connection of neutral point of electric network is to realize by the ground connection of transformer neutral point in the electrical network; during normal operation in the electrical network neutral point of transformer be earth potential, its three-phase voltage U
A, U
B, U
CVectogram is seen shown in the accompanying drawing 1; Then selectivity ground connection operational modes that adopt during actual motion more, promptly in the electrical network neutral point of part transformer through the direct ground connection of neutral point isolating switch of special use, the then earth-free operation of the neutral point of remaining transformer.In the selectivity ground connection operational mode transformer neutral point ground connection schematic diagram as shown in Figure 2, T1, T2 are transformers, K1, K2 are the neutral point isolating switch, the wherein neutral ground of T1, the isolated neutral of T2.In the actual motion, the general direct ground connection of transformer neutral point of adopting 1/2 quantity in each transformer station, and the operation of the isolated neutral of the transformer of other 1/2 quantity.Why adopt the main cause of selectivity ground connection operational mode to be: if all direct ground connection of the neutral point of all transformers in this type of electrical network, in case generation single phase ground fault, then the active transformer of all opposite sides all will provide earth fault current to the fault point, it is very big that the earth current of fault point will become, therefore the circuit breaker capacity of both sides, fault point circuit must be enough big, could effectively excise this fault point, earth current when reducing single phase ground fault, select Eco-power circuit breaker simultaneously for use, so adopt selectivity ground connection operational mode.
This selectivity earthing electric network is in actual motion; owing to various special reasons; move as protective device; circuit breaker action etc.; might form a local isolated neutral system accidentally; it is made up of one or several transformers; in this accidental local ungrounded electric net work that forms; if generation single phase ground fault; and under the situation that system does not in time excise faulty line; the fault phase-to-ground voltage is with vanishing (or near no-voltage); the voltage of transformer neutral point will be elevated to phase voltage by no-voltage (earth potential), and the voltage to earth of non-fault phase will be elevated to line voltage by phase voltage.Existing assumed fault is the B phase mutually, and the three-phase voltage vectogram is seen shown in the accompanying drawing 3 during fault, and in accompanying drawing 3, the B phase voltage is an earth potential, and the voltage of transformer neutral point is phase voltage.If fault is the single phase intermittent arc grounding, then the highest overvoltage level of system can reach 3.5 times of p.u, the peak value of phase-to-ground voltage when p.u is normal the operation.
Rules DL/T620-1997 makes clearly regulation to the overvoltage protection mode of earth-free transformer neutral point in the selectivity earthing electric network for this reason: the neutral point of earth-free transformer should be installed the gap in 110kV and the 220kV system, and the operation condition to the gap also illustrates simultaneously.So-called " gap " is actually the sparking electrode of being made up of a pair of point rod, and two electrodes are assemblied on the same axis, and electrode head is relative, keeps certain distance, and a lateral electrode connects transformer neutral point, the opposite side electrode grounding.Its operation principle is the volt-second characteristic that utilizes the gap to discharge in atmosphere; promptly the discharge voltage in gap is higher under the lightning wave effect; and discharge voltage hangs down this characteristic under power-frequency voltage, thereby satisfies the needs of transformer neutral point thunder and lightning, two kinds of overvoltage protections of power frequency simultaneously.The essence of gap protection is: when power-frequency overvoltage appears in transformer neutral point; spark-over of gap forms the arc road; with transformer neutral point ground connection, make the accidental local ungrounded electric net work that forms become the effectively earthed system of zero time property by the arc road by low-resistance arc road.Practical operating experiences proved afterwards, and protecting the neutral point of transformer in the mode in installing gap is rational and effective.The transformer neutral point elementary diagram is seen Fig. 4, T transformer, K neutral ground switch, J gap.At some in particular cases, consider the ability to bear of transformer neutral point, also on transformer neutral point and connect neutral point metal oxide arrester, english abbreviation: MOA to Lightning Over-voltage.This moment, the transformer neutral point elementary diagram was seen Fig. 5, T transformer, K neutral ground switch, J gap.
When discharging gap being installed at the scene obtaining actual effect, also exposed some problems and defective, mainly shown as:
1) the neutral point gap is self manufacture at the scene mostly, and outward appearance technology is coarse, and the specification disunity lacks the global design of product.
2) the clearance electrode rod is difficult for changing fast and adjusting after by electrical arc erosion.
3) distance of discharging gap is adjusted and is carried out making things convenient for inadequately when related electric is tested.
4) can not carry out on-the-spot Fast Installation.
The utility model content
At above-mentioned the deficiencies in the prior art, the technical problems to be solved in the utility model is that Optimal Structure Designing is carried out in transformer neutral point rod gap, provide a kind of simple in structure, be easy to the transformer neutral point rod gap protection device safeguarding, be convenient to install.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of transformer neutral point rod gap protection device; it comprises a pedestal; described pedestal is provided with a supporter and a metal ground connection pillar; described supporter is provided with a high voltage side electrode; described metal ground connection pillar is provided with a low-voltage side electrode; described high voltage side electrode and low-voltage side electrode are positioned on the same horizontal linear and are positioned opposite to each other; form the adjustable protection of arcing distance gap between described high voltage side electrode and the low-voltage side electrode, also be provided with a Current Transformer Assembly on the described metal ground connection pillar.
Preferably, described supporter is insulation support column or metal oxide arrester.
Preferably, described high voltage side electrode is connected with described supporter by a high-tension electricity polar arm, between described high voltage side electrode and the described high-tension electricity polar arm for being threaded.
Further, described high voltage side electrode is provided with clearance distance and adjusts nut.
Preferably, described low-voltage side electrode is connected with described metal ground connection pillar by a low tension polar arm, between described low-voltage side electrode and the described low tension polar arm for being threaded.
Further, described low-voltage side electrode is provided with clearance distance and adjusts nut.
The test connection screw that connects big ampere wires when preferably, described metal ground connection pillar top is provided with for test.
Preferably, described Current Transformer Assembly is the straight-through current transformer assembly.
Preferably, also be provided with suspension ring on the described pedestal.
Technique scheme has following beneficial effect: this transformer neutral point rod gap protection device is assemblied in all functors on the same pedestal; compact conformation; it is little to take up room; on-the-spot easy for installation; can effectively increase work efficiency; there is this unit protection gap discharge distance easy to adjust again, can guarantees the stable of gap discharge puncture voltage, therefore be applicable to all kinds of transformer stations.And low-voltage side electrode, high voltage side electrode summation current transformer assembly on this transformer neutral point rod gap protection device all have the dismounting of being easy to, and changes advantage easily.
Description of drawings
Fig. 1: transformer three-phase voltage and neutral point voltage vectogram in the effectively earthed system.
Fig. 2: transformer neutral point ground connection schematic diagram in the selectivity ground connection operational mode.
Fig. 3: when single phase ground fault occurring in the non-effectively earthed system, transformer three-phase voltage and neutral point voltage vectogram.
Fig. 4: transformer neutral point elementary diagram.
Fig. 5: and adorn the transformer neutral point elementary diagram of metal oxide arrester.
Fig. 6: the structural representation of the utility model transformer neutral point rod gap protection device.
Fig. 7: the structural representation of the transformer neutral point rod gap protection device of the utility model assembling metal oxide arrester.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail.
As shown in Figure 6, this transformer neutral point rod gap protection device comprises pedestal 1, and pedestal 1 is provided with as the insulation support column 2 of supporter and metal ground connection pillar 11.The neutral point lead-in wire terminal block 3 of one level is set on the insulation support column 2, neutral point lead-in wire terminal block 3 is connected with high-tension electricity polar arm 4, high-tension electricity polar arm 4 is provided with screwed hole, high voltage side electrode 6 insert in these screwed holes with high-tension electricity polar arm 4 by being threaded, rotation high voltage side electrode 6 can make high voltage side electrode 6 along axially the moving horizontally of high-tension electricity polar arm 4, and makes things convenient for the replacing of high voltage side electrode 6.Clearance distance is adjusted nut 5 and is enclosed within on the high voltage side electrode 6, clearance distance is adjusted nut 5 and high voltage side electrode 6 can be fastened on the high-tension electricity polar arm 4, high-field electrode 6 and high-tension electricity polar arm 4 are remained on the same axis, and neutral point lead-in wire terminal block 3 is connected with conductive bus bar from transformer neutral point N.
On the metal ground connection pillar 11 low tension polar arm 9 is set, low tension polar arm 9 is provided with screwed hole, low-voltage side electrode 7 insert in these screwed holes with low tension polar arm 9 between by being threaded, rotation low-voltage side electrode 7 can make it along axially the moving horizontally of low tension polar arm 9, and makes things convenient for the replacing of low-voltage side electrode 7.Clearance distance is adjusted nut 8 and is enclosed within on the low-voltage side electrode 7, and clearance distance is adjusted nut 8 and low-voltage side electrode 7 can be fastened on the low tension polar arm 9, and low-voltage side electrode 7 and low tension polar arm 9 are remained on the same axis.Metal ground connection pillar 11 tops are provided with test connection screw 10, the bottom of metal ground connection pillar 11 is provided with the Current Transformer Assembly 12 of punching, when carrying out the once big electric current transmission test of Current Transformer Assembly 12, big ampere wires can directly be connected on the test connection screw 10.Current Transformer Assembly 12 comprises Current Transformer Assembly feet 16, and Current Transformer Assembly feet 16 is used to support Current Transformer Assembly 12, and Current Transformer Assembly 12 and its pedestal 1 are firmly linked together.The electrorheological ratio of Current Transformer Assembly, protected level, output capacity can dispose by designing requirement.Adopt the straight-through current transformer assembly can make things convenient for replacement of element and maintenance.
High voltage side electrode 6 and low-voltage side electrode 7 are positioned on the same horizontal linear and are positioned opposite to each other; formation protection gap J spaced apart between high voltage side electrode 6 and the low-voltage side electrode 7; high voltage side electrode 6 is exactly the distance of protection gap J with the space length of low-voltage side electrode 7; the distance size of protection gap J is determining the height of discharge voltage; this distance can require to adjust by rotation high voltage side electrode 6 or low-voltage side electrode 7 according to actual motion, with the size of the stable and discharge voltage that guarantees the gap discharge puncture voltage.
Each parts is metallic conductor owing to be connected with the both sides sparking electrode, therefore high voltage side electrode 6 and the direct conducting of transformer neutral point N in fact, low-voltage side electrode 7 and the direct conducting of ground network E.When transformer neutral point N occurred being higher than the high voltage of excellent gap discharge voltage, gap J was breakdown in protection, breakdown current I
JFlow out by transformer neutral point N, will be successively through water conservancy diversion busbar, neutral point lead-in wire terminal block 3, high-tension electricity polar arm 4, high voltage side electrode 6, electric arc, low-voltage side electrode 7, low tension polar arm 9, metal ground connection pillar 11, pedestal 1, the ground connection band iron 15 last ground network E that flow into.At this moment, the secondary side that is arranged on the Current Transformer Assembly 12 on the metal ground connection pillar 11 will have signal of telecommunication output, and the size of this signal reflection discharging current is for other equipment and system's uses such as measurement in the transformer station, protection, records.
This transformer neutral point rod gap protection device compact overall structure; it is little to take up room; all functors are assemblied on the same pedestal 1; and also be provided with the suspension ring 14 of convenient lifting on the pedestal 1; only need once lifting just this can be installed on the Fast Installation structural column at the scene in place during on-the-spot the installation; can effectively increase work efficiency, and rapidly equipment be come into operation.
In such scheme, when supporter adopted the insulation support column, this device was to overlap independently transformer neutral point rod gap protection device.Again as shown in Figure 7; be another embodiment of the present utility model; the difference of itself and first embodiment is that supporter replaces with metal oxide arrester 13 by the insulation support column; this moment, this device just became transformer neutral point metal oxide arrester (MOA) and excellent combinations of gaps protective device, thereby made this transformer neutral point rod gap protection device have the better protection effect.
In sum, this transformer neutral point rod gap protection device is compared with existing transformer neutral point rod gap protection equipment and is had following advantage:
(1) gap discharge stable breakdown voltage, arcing distance is easy to adjust.
(2) after fault takes place, be easy to change the high voltage side electrode and the low-voltage side electrode of scaling loss.
(3) adopt the straight-through current transformer assembly of low-voltage grade to be easy to change and safeguard.
(4) all functions part is assemblied on the same pedestal, integral structure, and the on-site installation work amount is little.
(5) longitudinal size reduces, and it is little to take up room, and is applicable to all kinds of transformer stations.
More than transformer neutral point rod gap protection device that the utility model embodiment is provided be described in detail; for one of ordinary skill in the art; thought according to the utility model embodiment; part in specific embodiments and applications all can change; in sum; this description should not be construed as restriction of the present utility model, and all any changes of being made according to the utility model design philosophy are all within protection range of the present utility model.
Claims (9)
1. transformer neutral point rod gap protection device; it is characterized in that: it comprises a pedestal; described pedestal is provided with a supporter and a metal ground connection pillar; described supporter is provided with a high voltage side electrode; described metal ground connection pillar is provided with a low-voltage side electrode; described high voltage side electrode and low-voltage side electrode are positioned on the same horizontal linear and are positioned opposite to each other; form the adjustable protection of arcing distance gap between described high voltage side electrode and the low-voltage side electrode, also be provided with a Current Transformer Assembly on the described metal ground connection pillar.
2. transformer neutral point rod gap protection device according to claim 1, it is characterized in that: described supporter is insulation support column or metal oxide arrester.
3. transformer neutral point according to claim 1 rod gap protection device, it is characterized in that: described high voltage side electrode is connected with described supporter by a high-tension electricity polar arm, between described high voltage side electrode and the described high-tension electricity polar arm for being threaded.
4. transformer neutral point rod gap protection device according to claim 3, it is characterized in that: described high voltage side electrode is provided with clearance distance and adjusts nut.
5. transformer neutral point according to claim 1 rod gap protection device, it is characterized in that: described low-voltage side electrode is connected with described metal ground connection pillar by a low tension polar arm, between described low-voltage side electrode and the described low tension polar arm for being threaded.
6. transformer neutral point rod gap protection device according to claim 5, it is characterized in that: described low-voltage side electrode is provided with clearance distance and adjusts nut.
7. transformer neutral point rod gap protection device according to claim 1 is characterized in that: described metal ground connection pillar top connects the test connection screw of big ampere wires when being provided with for test.
8. transformer neutral point rod gap protection device according to claim 1, it is characterized in that: described Current Transformer Assembly is the straight-through current transformer assembly.
9. transformer neutral point rod gap protection device according to claim 1 is characterized in that: also be provided with suspension ring on the described pedestal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201020298U CN201608508U (en) | 2010-01-26 | 2010-01-26 | Transformer neutral point rod gap protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201020298U CN201608508U (en) | 2010-01-26 | 2010-01-26 | Transformer neutral point rod gap protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201608508U true CN201608508U (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201020298U Expired - Fee Related CN201608508U (en) | 2010-01-26 | 2010-01-26 | Transformer neutral point rod gap protection device |
Country Status (1)
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| CN (1) | CN201608508U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323759A (en) * | 2013-06-26 | 2013-09-25 | 深圳供电局有限公司 | Test platform of parallel protective gap of transformer neutral point |
| CN103401145A (en) * | 2013-08-01 | 2013-11-20 | 武汉大学 | Method for changing breakdown characteristics of rod-rod protection gap |
| CN103414158A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Novel bar-plate-bar protective gap device for protecting transformer neutral point |
| WO2015172532A1 (en) * | 2014-05-16 | 2015-11-19 | 齐进 | Compact main transformer neutral point rod gap lightning arrester and grounding whole-set protecting device |
| CN108594152A (en) * | 2018-07-19 | 2018-09-28 | 北京丹华正齐电力技术有限公司 | A kind of two-way controllable arc generator |
| CN111509562A (en) * | 2020-05-28 | 2020-08-07 | 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 | Device and method for quickly adjusting discharge gap |
-
2010
- 2010-01-26 CN CN2010201020298U patent/CN201608508U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323759A (en) * | 2013-06-26 | 2013-09-25 | 深圳供电局有限公司 | Test platform of parallel protective gap of transformer neutral point |
| CN103401145A (en) * | 2013-08-01 | 2013-11-20 | 武汉大学 | Method for changing breakdown characteristics of rod-rod protection gap |
| CN103414158A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Novel bar-plate-bar protective gap device for protecting transformer neutral point |
| CN103414158B (en) * | 2013-08-22 | 2016-09-21 | 深圳供电局有限公司 | A kind of New bar plate rod portable protective gaps device protecting transformer neutral point |
| WO2015172532A1 (en) * | 2014-05-16 | 2015-11-19 | 齐进 | Compact main transformer neutral point rod gap lightning arrester and grounding whole-set protecting device |
| CN108594152A (en) * | 2018-07-19 | 2018-09-28 | 北京丹华正齐电力技术有限公司 | A kind of two-way controllable arc generator |
| CN111509562A (en) * | 2020-05-28 | 2020-08-07 | 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 | Device and method for quickly adjusting discharge gap |
| CN111509562B (en) * | 2020-05-28 | 2024-04-02 | 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 | Device and method for quickly adjusting discharge gap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101013 Termination date: 20170126 |