CN201207564Y - Protection device for transformer earthing - Google Patents
Protection device for transformer earthing Download PDFInfo
- Publication number
- CN201207564Y CN201207564Y CNU2008200289204U CN200820028920U CN201207564Y CN 201207564 Y CN201207564 Y CN 201207564Y CN U2008200289204 U CNU2008200289204 U CN U2008200289204U CN 200820028920 U CN200820028920 U CN 200820028920U CN 201207564 Y CN201207564 Y CN 201207564Y
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- transformer
- lightning arrester
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- grounding
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Abstract
The utility model relates to a transformer grounding unit protector. A zinc oxide linear resistor is connected with a ground connector and a lightning arrester in parallel through leading wires, and a discharging gap is arranged among the leading wires. The other end of the leading wire is connected with a current transformer, and the current transformer, the lightning arrester, the ground connector and the zinc oxide linear resistor are fixed on an upper lever and an upright post respectively. The upright post is connected with a pedestal which is embedded in the ground, and a ground loop current transformer is connected with the ground connector through the leading wire. A function lever is connected with an actuating mechanism which is connected with the upright post through an anchor ear, and the lightning arrester is connected with a double-current on-line monitor through a bonding conductor. The other end of the ground loop current transformer is fixed on the upper lever. The utility model has simple structure and convenient use. The lightning arrester realizes non-maintaining and non-detection, and the zinc oxide linear resistor has small volume and good sealing performance for washing with electrification. The insulation distance between the discharging gap and the transformer is big, so the current can completely pass the transformer to ensure the normal action of relay protection.
Description
Technical field
The utility model relates to the power supply device, is specifically related to the complete protective device of a kind of transformer grounding.
Background technology
In the electric power system, 110KV and above electrical network belong to heavy current grounding system, require neutral-point solid ground.But in the electrical network actual motion; in order to guarantee that system operation mode is when changing; it is constant substantially that zero-sequence network keeps; reach the purpose that makes the ground protection scope constant substantially; and in order to reduce the earth short circuit current level of whole electric power system; usually take part transformer neutral point ground connection, the earth-free operational mode of another part transformer neutral point, promptly the earthing mode of transformer neutral point is relevant with the running status of electrical network.Along with the continuation development of electrical network, transmission capacity enlarges, and circuit is apart from increase, and electric pressure raises, and produces very big earthing capacitance current in the fault point when making circuit generation single-phase fault, destroys transformer turn-to-turn insulation.Transformer for the isolated neutral operation can produce the higher power-frequency overvoltage of amplitude at transformer neutral point when system single-phase earth fault or open-phase operation; When lightning wave when circuit is invaded, can produce the higher lightning overvoltage of amplitude in the transformer neutral point reflection.Homemade in addition transformer neutral point generally all adopts the graded insulation structure, and neutral point insulation is relatively weaker, therefore must rational overvoltage protection mode be set in neutral point circuit, to guarantee the transformer safe operation.
The product that existing market has pair transformer neutral point to protect, comprising lightning arrester, discharging gap, current transformer, earthed switch etc., but there is following shortcoming in this structure:
1, the insulation distance in the middle of gap and the instrument transformer is too short, as will be when the gap discharge, higher because of the neutral point overvoltage amplitude, overvoltage can be by iron directly to being equipped with the iron case discharge ground connection of instrument transformer, and without instrument transformer, instrument transformer does not just have due effect like this.
2, lightning arrester defective: a, because of most of product uses the porcelain coat lightning arrester, if lightning arrester damages, lightning arrester can be blasted, the safety of personnel and miscellaneous equipment around the harm.Do not blast if the B lightning arrester damages or crackle appears in shell, so just be not easy to find that the result can make the direct ground connection of transformer neutral point.Lightning arrester does not have protective effect.And will often lightning arrester be safeguarded and detect, to guarantee the normal operation of lightning arrester, workload is big.
3, lightning arrester is only joined discharge counter or monitor, can only monitor the action frequency and the total current that flows through lightning arrester of lightning arrester, accurate response goes out the operating state of lightning arrester in real time.
4, present most of gap is vertical installation, and rainwater can greatly reduce the discharge parameter in excellent gap like this.
5, resistance device during existing product is not all joined, if any middle resistance device, major part is that metal material is made, volume is big, and weight is big, and needs independent the installation, workload is big, and floor space is big, and the discharge voltage of the parameter of middle resistance device and lightning arrester and discharging gap all will accurately cooperate.
6, the grounded circuit current transformer is not installed in the grounding device lower end, when the direct ground connection of earthed switch, can not reflect the earth current size and supply the secondary used for relay protection.
7, do not install additional in the resistance device, if when single phase ground fault takes place, transformer neutral point can produce very big earthing capacitance current, destroys transformer turn-to-turn insulation.
By the above, there is the defective that does not also have very ripe, the safe complete protective device of transformer grounding at present.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, and is easy to use, and lightning arrester is realized the complete protective device of transformer grounding non-maintaining, inspection-free survey.
In order to overcome the deficiency that exists in the back of the body technology; the technical solution of the utility model is to solve like this: the complete protective device of a kind of transformer grounding; comprise and be connected with the V-type grounding device on the horizontal support respectively; lightning arrester; current transformer; connect the ground connection action bars on its V-type grounding device; ground connection action bars bottom is connected with operating mechanism; operating mechanism is connected with column; V-type grounding device top is wired to the lightning arrester top; be provided with discharging gap between the extended end of current transformer top by the lead that connects and lead; its special character is also to comprise that the zinc oxide linear resistor top that connects on the horizontal support is connected in parallel by lead and V-type grounding device top; V-type grounding device top also is connected with the top of grounded circuit current transformer on being connected horizontal support by lead; described lightning arrester bottom inner chamber is connected with a heat explosion type disconnector; described current transformer; be connected with protector on the grounded circuit current transformer respectively; the heat explosion type disconnector connects a double-current on-line monitoring device by lead; the double-current on-line monitoring device other end is connected on the column; the column bottom connects a mounting seat, and its mounting seat is imbedded the earth.
The utility model compared with prior art has following characteristics:
1, the utility model combines zinc oxide linear resistor, discharging gap, lightning arrester and grounding device; constitute integrative-structure; before protector dispatches from the factory; discharging gap is just debugged fully, and discharging gap is an adjustable clearance, and size is controlled easily; the dome-type gap can be pulled down; the gap can become the clavate gap, the smooth no burr of dome-type clearance surface, and Electric Field Distribution is even.Transformer neutral point can reduce the neutral ground capacitance current, thereby better protection transformer turn-to-turn insulation is not damaged by zinc oxide linear resistor ground connection.Zinc oxide linear resistor volume is little, good seal performance, temperature rise are low, 30 years non-maintaining, can chargedly wash, protective value is better.
2, insulation distance is big between discharging gap and the instrument transformer, makes electric current pass through instrument transformer fully, guarantees the relaying protection regular event.
3, lightning arrester is realized non-maintaining, inspection-free survey.The lightning arrester lower end has heat explosion type disconnector and double-current on-line monitoring device, as long as disconnector does not come off, proves that the lightning arrester operation is normal, and non-maintaining, inspection-free survey reduces workload.The ruuning situation of double-current on-line monitoring device energy real time reaction lightning arrester, for example: the internal leakage electric current of lightning arrester, external leaks electric current and action frequency.
4, the loop, gap directly is fixed on the base plate and separates fully with lightning arrester, helps detection, maintenance and the replacing of lightning arrester like this.
5, the grounded circuit current transformer is equipped with in the grounding device lower end, when the direct ground connection of earthed switch, can reflect the earth current size and supply the secondary used for relay protection.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Accompanying drawing is embodiment of the present utility model.
Below in conjunction with accompanying drawing summary of the invention is described further:
With reference to shown in Figure 1; comprise and be connected with V-type grounding device 4 on the horizontal support 14 respectively; lightning arrester 7; current transformer 8; connect ground connection action bars 11 on the V-type grounding device 4; ground connection action bars 11 bottoms are connected with operating mechanism 12; operating mechanism 12 is connected with column 15; V-type grounding device 4 tops are connected to lightning arrester 7 tops by lead 5; be provided with discharging gap 6 between the extended end of current transformer 8 tops by the lead 13 that connects and lead 5; zinc oxide linear resistor 1 top that connects on its horizontal support 14 is connected in parallel by lead 3 and V-type grounding device 4 tops; V-type grounding device 4 tops also are connected with the top of grounded circuit current transformer 2 on being connected horizontal support 14 by lead 17; described lightning arrester 7 bottom inner chambers are connected with a heat explosion type disconnector 19; described current transformer 8; be connected with protector 18 on the grounded circuit current transformer 2 respectively; heat explosion type disconnector 19 connects a double-current on-line monitoring device 10 by lead 9; double-current on-line monitoring device 10 other ends are connected on the column 15; column 15 bottoms connect a mounting seat 16, and its mounting seat 16 is imbedded the earth.
Described V-type grounding device is connected with operating mechanism with plug-in strip, steering spindle and pull bar respectively, and described plug-in strip and lightning arrester, grounded circuit current transformer are in parallel, and described operating mechanism is connected with plug-in strip with steering spindle by pull bar.
Described discharging gap lower end is connected to current transformer and protector.
Described band disconnector lightning arrester is circumscribed with the on-line monitoring device.
Described discharging gap, current transformer, composite sheath band disconnector lightning arrester, double-current on-line monitoring device, zinc oxide linear resistor and V-type grounding device all are provided with and are installed on the type horizontal shore.
Described discharging gap is ball-type gap, excellent type gap or goat's horn gap.
Described current transformer is high pressure dry, oil-immersed current transformer or low-voltage current mutual inductor.
Described double-current on-line monitoring device is JCQ-CI, JCQ-C6 double-current monitor or JSQ-1,000 digit counters.
Described operating mechanism is CS8-5 type man-operating mechanism or CJ6 type motor drive mechanism.
The neutral resistance sheet of described zinc oxide linear resistor is a zinc oxide linear resistance sheet, and shell is seamless steel pipe and does antirust processing.
Wherein: discharging gap 6 is exclusively used in protection lightning arrester 7, and improves the selectivity of relaying protection action, matches with lightning arrester 7, guarantees lightning arrester 7 action earlier, gap breakdown before lightning arrester 7 damages, and lightning arrester 7 short circuits, thus protection lightning arrester 7.Ball-type gap, excellent type gap or goat's horn gap can be adopted in the gap.
Current transformer 8 is exclusively used in the electric current that flows through neutral point when measurement clearance punctures; can adopt high pressure dry, oil-immersed current transformer or low-voltage current mutual inductor; the mutual device 8 of electric current can install 18 pairs of current transformers of protector additional to be protected, and described protector is a surge protector.
Lightning arrester 7 is exclusively used in the level of limiting transformer neutral point overvoltage, realizes that effectively the insulation of protection transformer neutral point is not encroached on.Double-current on-line monitoring device 10 is exclusively used in the action frequency of record lightning arrester and monitors the leakage current of lightning arrester inside and outside so that understand the running status of lightning arrester immediately.
Described heat explosion type disconnector 19 is mainly used in whether detect lightning arrester 7 intact, if heat explosion type disconnector 19 is dragged out lightning arrester 7 away from, proves that lightning arrester 7 has damaged, needs the user to change lightning arrester 7.
Grounded circuit current transformer 2 and earthed switch parallel connection, special monitoring is by the earth current of neutral point when the direct ground connection of earthed switch.
Grounding device is realized direct ground connection of transformer or the operation of earth-free dual mode.Comprise operating mechanism, action bars can adopt man-operating mechanism or motor drive mechanism.
Dynamic process:
When operation,, can realize the operation of transformer neutral point ground connection and earth-free dual mode by operating mechanism 12 and action bars 11 control V-type grounding devices.
Claims (10)
1; the complete protective device of a kind of transformer grounding; comprise and be connected with V-type grounding device (4) on the horizontal support (14) respectively; lightning arrester (7); current transformer (8); V-type grounding device (4) is gone up and is connected ground connection action bars (11); ground connection action bars (11) bottom is connected with operating mechanism (12); operating mechanism (12) is connected with column (15); V-type grounding device (4) top is connected to lightning arrester (7) top by lead (5); be provided with discharging gap (6) between the extended end of current transformer (8) top by the lead (13) that connects and lead (5); it is characterized in that also comprising that zinc oxide linear resistor (1) top that horizontal support (14) upward connects is connected in parallel by lead (3) and V-type grounding device (4) top; V-type grounding device (4) top also is connected with the top of grounded circuit current transformer (2) on being connected horizontal support (14) by lead (17); described lightning arrester (7) bottom inner chamber is connected with a heat explosion type disconnector (19); described current transformer (8); be connected with protector (18) on the grounded circuit current transformer (2) respectively; heat explosion type disconnector (19) connects a double-current on-line monitoring device (10) by lead (9); double-current on-line monitoring device (10) other end is connected on the column (15); column (15) bottom connects a mounting seat (16), and its mounting seat (16) is imbedded the earth.
2, the complete protective device of transformer grounding according to claim 1; it is characterized in that described V-type grounding device is connected with operating mechanism with plug-in strip, steering spindle and pull bar respectively; described plug-in strip and lightning arrester, grounded circuit current transformer are in parallel, and described operating mechanism is connected with plug-in strip with steering spindle by pull bar.
3, the complete protective device of transformer grounding according to claim 1 and 2 is characterized in that described discharging gap lower end is connected to current transformer and protector.
4,, it is characterized in that described band disconnector lightning arrester is circumscribed with the on-line monitoring device according to the complete protective device of the described transformer grounding of claim 3.
5, the complete protective device of transformer grounding according to claim 4 is characterized in that: described discharging gap, current transformer, composite sheath band disconnector lightning arrester, double-current on-line monitoring device, zinc oxide linear resistor and V-type grounding device all are provided with and are installed on the type horizontal shore.
6, the complete protective device of transformer grounding according to claim 1 is characterized in that described discharging gap is ball-type gap, excellent type gap or goat's horn gap.
7, the complete protective device of transformer grounding according to claim 3 is characterized in that: described current transformer is high pressure dry, oil-immersed current transformer or low-voltage current mutual inductor.
8, the complete protective device of transformer grounding according to claim 4 is characterized in that: described double-current on-line monitoring device is JCQ-CI, JCQ-C6 double-current monitor or JSQ-1,000 digit counters.
9, the complete protector of transformer grounding according to claim 2 is characterized in that: described operating mechanism is CS8-5 type man-operating mechanism or CJ6 type motor drive mechanism.
10, according to the complete protector of claims 1 described transformer grounding, the neutral resistance sheet that it is characterized in that described zinc oxide linear resistor is a zinc oxide linear resistance sheet, and shell is seamless steel pipe and does antirust processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200289204U CN201207564Y (en) | 2008-04-23 | 2008-04-23 | Protection device for transformer earthing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200289204U CN201207564Y (en) | 2008-04-23 | 2008-04-23 | Protection device for transformer earthing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207564Y true CN201207564Y (en) | 2009-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200289204U Expired - Lifetime CN201207564Y (en) | 2008-04-23 | 2008-04-23 | Protection device for transformer earthing |
Country Status (1)
| Country | Link |
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| CN (1) | CN201207564Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697399A (en) * | 2009-10-21 | 2010-04-21 | 西安安捷迅电气有限公司 | Gap type lightning protector with releasing device |
| CN103414158A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Novel rod-plate-rod protection gap device for protecting transformer neutral point |
| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for protecting gap action of transformer neutral point |
| CN106533133A (en) * | 2016-12-01 | 2017-03-22 | 南通沃特光电科技有限公司 | Packaging method of high-voltage frequency converter power unit |
| CN107861057A (en) * | 2017-10-09 | 2018-03-30 | 国网江西省电力公司电力科学研究院 | A kind of determination method of the key parameter of separator used for lightning protector |
| CN111968824A (en) * | 2020-07-17 | 2020-11-20 | 湖南长高高压开关集团股份公司 | Transformer neutral point complete protection device |
-
2008
- 2008-04-23 CN CNU2008200289204U patent/CN201207564Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697399A (en) * | 2009-10-21 | 2010-04-21 | 西安安捷迅电气有限公司 | Gap type lightning protector with releasing device |
| CN101697399B (en) * | 2009-10-21 | 2014-01-22 | 西安安捷迅电气有限公司 | Gap type lightning protector with releasing device |
| CN103414158A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Novel rod-plate-rod protection gap device for protecting transformer neutral point |
| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for protecting gap action of transformer neutral point |
| CN103414157B (en) * | 2013-08-22 | 2016-06-08 | 深圳供电局有限公司 | Device for protecting gap action of transformer neutral point |
| CN103414158B (en) * | 2013-08-22 | 2016-09-21 | 深圳供电局有限公司 | Novel rod-plate-rod protection gap device for protecting transformer neutral point |
| CN106533133A (en) * | 2016-12-01 | 2017-03-22 | 南通沃特光电科技有限公司 | Packaging method of high-voltage frequency converter power unit |
| CN107861057A (en) * | 2017-10-09 | 2018-03-30 | 国网江西省电力公司电力科学研究院 | A kind of determination method of the key parameter of separator used for lightning protector |
| CN111968824A (en) * | 2020-07-17 | 2020-11-20 | 湖南长高高压开关集团股份公司 | Transformer neutral point complete protection device |
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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: 20090311 |
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| CX01 | Expiry of patent term |