CN202856318U - Lightning protection structure for counterattack current division of transformer - Google Patents
Lightning protection structure for counterattack current division of transformer Download PDFInfo
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- CN202856318U CN202856318U CN 201220548665 CN201220548665U CN202856318U CN 202856318 U CN202856318 U CN 202856318U CN 201220548665 CN201220548665 CN 201220548665 CN 201220548665 U CN201220548665 U CN 201220548665U CN 202856318 U CN202856318 U CN 202856318U
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- control unit
- impedance control
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Abstract
The utility model discloses a lightning protection structure for counterattack current division of a transformer, which comprises a transformer and a primary winding high-voltage lightning arrester connected with an input end of the transformer, wherein a neutral line and a shell of the transformer are connected to a grounding grid, and the transformer and an output end thereof are connected to a transformer lightning protection box. The transformer lightning protection box further comprises a lightning current frequency impedance control unit and a TSPD lightning protection module, wherein one end of the lightning current frequency impedance control unit is connected to the transformer, and the other end is connected to the grounding grid; and one end of the TSPD lightning protection module is connected to the output end of the transformer, and the other end is grounded. The lightning protection structure for the counterattack current division of the transformer can effectively protect the transformer from being burned down by lightning attack, and is widely applied to isolation type lightning protection devices of various 10KV/400V transformers.
Description
Technical field
The utility model has related to a kind of lightning protection device, has related in particular to the lightning protection structure of transformer counterattack shunting.
Background technology
Abominable along with climate change, the lightning hazards accident occurs more and more frequent and serious, and people's lives and properties are caused grave danger.In electrical power transmission system, because cable adopts built on stilts transmission, the as easy as rolling off a log lightning ingress that suffers damages power equipment, and is especially serious to the damage of high-low pressure transformer; According to the IEC thunder-strike prevention standard, require generally in the primary side of transformer (zinc oxide) high-voltage arrester to be installed, adopt line protected mode over the ground; Require the 10KV/400V transformer secondary output to adopt star (Y) and triangle (△) sending and receiving according to electric power system, be divided into the standards such as TT, IT, TN, wherein the transformer secondary output winding adopts the transformer neutral earthing of Y connection, and and the shared earth mat of high-tension transformer.But in face of thunderstorm, transformer still cannot withstand a single blow, and Lightning Fault occurs again and again.
Owing to setting up a complete electric power system and lightning protection system, need different industries to finish, and power industry is served a lot of industries, and each industry has the standards and norms of oneself, has so just occurred between industry and the industry, has occurred incompatible between system and the system and conflict even occurs protecting the dead angle, protect leak.For example power industry and the communications industry, the communications industry need to be built a mobile base station on the highest point mountain in suburb, in order to reduce input cost, Utilities Electric Co. is installed in the foot of the hill with the 10KV/400V transformer, and do a primary lightning protection (line is installed valve type 10KV lightning protection device over the ground, and protection is shunted, shifted to the power circuit of 10KV end); The communication common carrier then transformer by at the foot of the hill obtains power supply, and the logical built on stilts mode of power supply is guided in the machine room of mountain top, and is requiring to take lightning protection measures in the power of computer room porch according to corresponding.
Above this installation connected mode ignored the lightning protection of transformer, have following hidden danger:
Although the armature winding of 1 transformer has been installed the high pressure lightning protection device, owing to being subjected to the impact of earth resistance, therefore can't resolve the damage that thunder and lightning invasion transformer causes.
2, because the shell of the 10KV/400V transformer neutral line and protection ground wire needs ground connection; can produce the danger of high pressure counterattack; when the 10KV high-pressure side has lightning current when the high pressure lightning protection device discharges over the ground; then again enter the transformer secondary output winding and conduct to the shell of transformer through the neutral line, cause the damage of transformer.
3, when thunder and lightning is introduced from transformer secondary output, lightning current can intrude into the winding of transformer through over the ground earial drainage, discharge of the neutral line, causes like this lightning current to form over the ground the loop through secondary winding, raises transformer-secondary voltage, and counterattack causes damage to high-pressure side.
The utility model content
The technical problems to be solved in the utility model is in order to overcome technological deficiency recited above, a kind of lightning protection structure of transformer counterattack shunting to be provided.
In order to solve technical problem recited above, the utility model is taked following technical scheme:
A kind of lightning protection structure of transformer counterattack shunting, include the armature winding high-voltage arrester of transformer, connection transformer input, the neutral line of described transformer and earthing of casing net, described transformer and output thereof are connected with the transformer lightning protection box, and described transformer lightning protection box further includes lightning current frequency impedance control unit and TSPD lightning protection module; One end connection transformer of described lightning current frequency impedance control unit, the other end connects earth mat; The output of one end connection transformer of described TSPD lightning protection module, other end ground connection.
Described lightning current frequency impedance control unit further includes the first lightning current frequency impedance control unit and the second lightning current frequency impedance control unit; The shell of one end connection transformer of described the second lightning current frequency impedance control unit, the other end connects earth mat; The neutral line of one end connection transformer of described the first lightning current frequency impedance control unit, the other end connects earth mat.
Lightning current frequency impedance control unit (hereinafter to be referred as ALFB) is a kind of special perceptual device, the meeting characteristic that impedance changes with the rising of thunder and lightning frequency.Be connected on respectively transformer the neutral line and the protection ground wire shell on; ALFB moment is high impedance status and Transformer Winding forms the tandem impedance when having thunder and lightning to intrude into earth terminal; because the impedance in this loop is very high, force lightning current to release over the ground according to current characteristics (electric current drop resistance loop).Make it can't raise the transformer secondary output winding voltage and hull return circuit conducts, discharges.
Described TSPD lightning protection module is comprised of at least 3 TSPD lightning protection unit.
The the second Thermal Cutoffs FU ' that is used for the heat monitoring that described TSPD lightning protection unit further includes the first Thermal Cutoffs FU, the varistor MOV that connects with the first Thermal Cutoffs FU and is arranged at varistor MOV side.
The discharge capacity of described the first Thermal Cutoffs FU is 40KA, and the discharge capacity of described varistor MOV is identical with the first Thermal Cutoffs FU.
The temperature coefficient of described the second Thermal Cutoffs FU ' is less than the temperature coefficient of the first Thermal Cutoffs FU.
When transformer output (being the low-voltage line terminal) has the thunder and lightning invasion, ALFB on the neutral line and TSPD lightning protection module respond simultaneously, ALFB and transformer secondary output winding form the tandem high impedance, cut off the propagation of lightning current, and can relax the earth resistance of transformer station to 100 ohm (because when ALFB had the thunder and lightning invasion, the impedance that presents was far longer than 100 ohm); And TSPD lightning protection module instant response conducting (being short-circuit condition) with lightning current shunt over the ground, the voltage of transfer, the range of decrease, voltage stabilizing transformer secondary winding, protection transformer and reduce the thunderbolt energy of follow-up load equipment.
The utility model has been avoided thunder-strike current by the phenomenon generation of ground anti-channeling to transformer, thereby has been protected transformer by at the lightning current frequency impedance control unit of connect between transformer and the earth mat; Simultaneously by the cooperating of ALFB and TSPD lightning protection module, prevented that thunder-strike current from occuring by the output invasion of transformer and the phenomenon that burns out transformer.
The lightning protection structure of a kind of transformer counterattack shunting that the utility model provides can protect transformer not burnt by thunderbolt effectively, is widely used in the separation thunder-prevention protective device of all kinds of 10KV/400V transformers.
Description of drawings
Fig. 1 is structure chart of the present utility model.
Fig. 2 is the structure chart of TSPD lightning protection unit
Among the figure, 1. transformer, 2. transformer lightning protection box, 3. armature winding high-voltage arrester, 4. earth mat, 21. lightning current frequency impedance control units, 211. first lightning current frequency impedance control units, 212. second lightning current frequency impedance control units, 22.TSPD lightning protection module, 221.TSPD lightning protection unit.
Embodiment
See also Fig. 1, as shown in the figure, a kind of lightning protection structure of transformer counterattack shunting, include the armature winding high-voltage arrester 3 of transformer 1, connection transformer 1 input, the neutral line of transformer 1 and earthing of casing net 4, transformer 1 and output thereof are connected with transformer lightning protection box 2, and transformer lightning protection box 2 further includes lightning current frequency impedance control unit 21 and TSPD lightning protection module 22; One end connection transformer 1 of lightning current frequency impedance control unit 21, the other end connects earth mat 4; TSPD lightning protection module 22 is comprised of at least 3 TSPD lightning protection unit 221; The output of one end connection transformer 1 of TSPD lightning protection module 22, other end ground connection.Lightning current frequency impedance control unit 21 further includes the first lightning current frequency impedance control unit 211 and the second lightning current frequency impedance control unit 212; The shell of one end connection transformer 1 of the second lightning current frequency impedance control unit 212, the other end connects earth mat 4; The neutral line of one end connection transformer 1 of the first lightning current frequency impedance control unit 211, the other end connects earth mat 4.Among the figure, lines a, b, c are representing respectively the track route of thunder-strike current.
See also Fig. 2; as shown in the figure, TSPD lightning protection unit 221 the second Thermal Cutoffs FU ' that is used for the heat monitoring that further includes the first Thermal Cutoffs FU, the varistor MOV that connects with the first Thermal Cutoffs FU and be arranged at varistor MOV side.The discharge capacity of the first Thermal Cutoffs FU is 40KA, and the discharge capacity of varistor MOV is identical with the first Thermal Cutoffs FU, and the temperature coefficient of the second Thermal Cutoffs FU ' is less than the temperature coefficient of the first Thermal Cutoffs FU.
The utlity model has following characteristics:
1, isolates the high-pressure side lightning current and after earth potential is to the conduction of the transformer neutral line, protection ground wire, counterattack, raised voltage in the transformer secondary output winding, caused boost damage of counterattack.
2, isolated lightning current and introduced from low-pressure end, the path that is formed over the ground by the neutral line after entering from the transformer secondary output winding, the counterattack that the causes damage of boosting.
3, provide transformer secondary output by-pass shunt device, install at the transformer secondary output end have the electronic type overcurrent, overvoltage, overheated TSPD lightning protection module, with the thunderbolt of transformer secondary output end shunt, transfer, the range of decrease, voltage stabilizing, and satisfy energy conservation principle.
4, the TSPD lightning protection module in the device possesses the normally closed switch loop, behind the series LED, has realized the monitoring to the operating state of TSPD lightning protection module, reduces maintenance difficulties and cost.Possess fault indication function is arranged, the attendant according to the state of indicator light, need not dismantle at the scene, need not open (machine) case, need not carry operating state and performance that the professional test instrument test just can accurately be judged the transformer lightning protection, maintains easily.
Claims (6)
1. a transformer is strikeed back the lightning protection structure of shunting, include the armature winding high-voltage arrester of transformer, connection transformer input, the neutral line of described transformer and earthing of casing net, it is characterized in that: described transformer and output thereof are connected with the transformer lightning protection box, and described transformer lightning protection box further includes lightning current frequency impedance control unit and TSPD lightning protection module; One end connection transformer of described lightning current frequency impedance control unit, the other end connects earth mat; The output of one end connection transformer of described TSPD lightning protection module, other end ground connection.
2. lightning protection structure as claimed in claim 1, it is characterized in that: described lightning current frequency impedance control unit further includes the first lightning current frequency impedance control unit and the second lightning current frequency impedance control unit; The shell of one end connection transformer of described the second lightning current frequency impedance control unit, the other end connects earth mat; The neutral line of one end connection transformer of described the first lightning current frequency impedance control unit, the other end connects earth mat.
3. lightning protection structure as claimed in claim 1, it is characterized in that: described TSPD lightning protection module is comprised of at least 3 TSPD lightning protection unit.
4. transformer lightning protection structure as claimed in claim 3 is characterized in that: the second Thermal Cutoffs FU ' that is used for the heat monitoring that described TSPD lightning protection unit further includes the first Thermal Cutoffs FU, the varistor MOV that connects with the first Thermal Cutoffs FU and is arranged at varistor MOV side.
5. lightning protection structure as claimed in claim 4, it is characterized in that: the discharge capacity of described the first Thermal Cutoffs FU is 40KA, the discharge capacity of described varistor MOV is identical with the first Thermal Cutoffs FU.
6. such as claim 4 or 5 described lightning protection structures, it is characterized in that: the temperature coefficient of described the second Thermal Cutoffs FU ' is less than the temperature coefficient of the first Thermal Cutoffs FU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548665 CN202856318U (en) | 2012-10-24 | 2012-10-24 | Lightning protection structure for counterattack current division of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548665 CN202856318U (en) | 2012-10-24 | 2012-10-24 | Lightning protection structure for counterattack current division of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202856318U true CN202856318U (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220548665 Withdrawn - After Issue CN202856318U (en) | 2012-10-24 | 2012-10-24 | Lightning protection structure for counterattack current division of transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN202856318U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904213A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Lightning protection structure for counterattack shunting of transformer |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
| CN112470241A (en) * | 2020-05-06 | 2021-03-09 | 深圳欣锐科技股份有限公司 | Transformer and method for manufacturing transformer |
| CN113012913A (en) * | 2021-02-22 | 2021-06-22 | 融科能源***(广东)有限公司 | Lightning protection method and system for transformer |
| CN118091326A (en) * | 2024-04-17 | 2024-05-28 | 国网辽宁省电力有限公司丹东供电公司 | Ground fault judging method and system based on current change characteristics |
-
2012
- 2012-10-24 CN CN 201220548665 patent/CN202856318U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904213A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Lightning protection structure for counterattack shunting of transformer |
| CN102904213B (en) * | 2012-10-24 | 2016-06-29 | 深圳市雷博斯科技有限公司 | A kind of lightning protection structure of transformator counterattack shunting |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
| CN112470241A (en) * | 2020-05-06 | 2021-03-09 | 深圳欣锐科技股份有限公司 | Transformer and method for manufacturing transformer |
| WO2021223114A1 (en) * | 2020-05-06 | 2021-11-11 | 深圳欣锐科技股份有限公司 | Transformer and manufacturing method for transformer |
| CN112470241B (en) * | 2020-05-06 | 2024-02-13 | 深圳欣锐科技股份有限公司 | Transformer and method for manufacturing the same |
| CN113012913A (en) * | 2021-02-22 | 2021-06-22 | 融科能源***(广东)有限公司 | Lightning protection method and system for transformer |
| CN118091326A (en) * | 2024-04-17 | 2024-05-28 | 国网辽宁省电力有限公司丹东供电公司 | Ground fault judging method and system based on current change characteristics |
| CN118091326B (en) * | 2024-04-17 | 2024-06-21 | 国网辽宁省电力有限公司丹东供电公司 | Ground fault judging method and system based on current change characteristics |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130403 Effective date of abandoning: 20160629 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |