CN202956482U - Small current system single-phase grounding fault detection verifying device - Google Patents
Small current system single-phase grounding fault detection verifying device Download PDFInfo
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- CN202956482U CN202956482U CN201220626503.6U CN201220626503U CN202956482U CN 202956482 U CN202956482 U CN 202956482U CN 201220626503 U CN201220626503 U CN 201220626503U CN 202956482 U CN202956482 U CN 202956482U
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- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 238000004088 simulation Methods 0.000 claims abstract description 15
- 230000007935 neutral effect Effects 0.000 claims abstract description 14
- 230000001629 suppression Effects 0.000 claims abstract description 5
- 230000003278 mimic effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 abstract description 7
- 239000003990 capacitor Substances 0.000 abstract description 3
- 238000012806 monitoring device Methods 0.000 abstract description 3
- 230000006855 networking Effects 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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Abstract
The utility model discloses a small current system single-phase grounding fault detection verifying device, which comprises a transformer which is connected with a power distribution network, and is characterized by further comprising a plurality of groups of single-phase grounding fault simulation circuits, wherein the single-phase grounding fault simulation circuits which are formed by connecting an auto-transformer with a bus through a current transformer, connecting the bus and a branch line, and connecting the branch line and a simulated branch circuit capacitor and load, the auto-transformer of the single-phase grounding fault simulation circuits is connected with a the transformer, and the bus is connected with a voltage transformer. The auto-transformer is connected with a neutral grounding resistance and a neutral arc suppression coil. The small current system single-phase grounding fault detection verifying device has the advantages of reasonable structure and reliable performance and the like, and can verify a direct current insulation monitoring device before entering the network, thereby guaranteeing safety, and meeting requirement of network access standard.
Description
Technical field
The utility model relates to the distribution network system detection equipment, is a kind of small current system single-phase earth fault detection check device.
Background technology
Distribution network is being undertaken the Link role of user and transmission line of electricity.At present, the ground connection residual voltage alarming value of small current system power distribution network is 30V, when residual voltage is greater than 30V, the uneven level of distribution network voltage has reached more than 50%, this has an infringement for apparatus insulated, therefore, reduces the residual voltage alarming value less to the insulation breakdown that reduces fault and equipment.
The function of power distribution network small current system single-phase earth fault detection check device is the standard-required that safety in order to guarantee system and equipment network.Analog bus voltage is got 1000V with per unit value the same terms simulation, and voltage transformer (VT) is 1000/100, current transformer is 5/1 ampere, is exactly that the secondary side Signals & Systems are identical.Simulation 10.5KV, its system insulation alarming value is zero sequence phase voltage 30V, can arrange 0 to full scale line voltage 100V.Detect and differentiate the new scope of proposition verification, voltage can be 66KV, 33KV, 10.5KV.Detect and differentiate the scope proposed, adjustable at 0V-100V according to different electric pressures, can meet the system phenomenon.The simulation of 0uf-300uf tunable capacitor is set, can meets the phenomenon of system capacity current.Also comprise and can simulate various neutral by arc extinction coil grounding, low resistance grounding, large resistance earthing and change system operation mode.Up to now, there is not yet relevant bibliographical information and practical application.
Summary of the invention
The purpose of this utility model is, provides a kind of rational in infrastructure, and dependable performance is carried out verification before can networking to direct-current insulation monitoring device, with the security that guarantees system and the small current system single-phase earth fault detection check device that meets the networking standard-required.
The purpose of this utility model is realized by following technical scheme: a kind of small current system single-phase earth fault detection check device, comprise the transformer be connected with power distribution network, it is characterized in that, also comprise that some groups are connected with bus by current transformer by auto-transformer, bus and branch line connection, be connected with the singlephase earth fault mimic channel that simulation branch road electric capacity and load form on the branch line circuit, the auto-transformer of singlephase earth fault mimic channel is connected with transformer, is connected with voltage transformer (VT) on bus.
Described auto-transformer is connected with neutral resistance, neutral point arc suppression coil in parallel.
The advantage applies of small current system single-phase earth fault detection check device of the present utility model exists:
1, in the time of can simulating small current system single-phase earthing barrier, residual voltage 0 to 57.7V alerting signal is adjustable;
2, simulation branch road ground holds adjustable;
3, grounding mode of transformer neutral-point is adjustable;
4, the method for operation of branch line circuit is adjustable;
5, load is adjustable;
6, voltage, laod unbalance is adjustable;
7, the parameter that breaks down can change as requested;
8, it is rational in infrastructure, and dependable performance is carried out verification before can networking to direct-current insulation monitoring device, with the security that guarantees system and meet the networking standard-required.
The accompanying drawing explanation
Fig. 1 is small current system single-phase earth fault detection check device circuit schematic diagram.
In figure: 1 transformer, 2 neutral resistances, 3 neutral point arc suppression coils, 4 auto-transformers, 5 buses,
6-1,6-2,6-3 simulation branch road electric capacity, 7 branch line circuits, 8 current transformers, 9 voltage transformer (VT), 10 loads.
Embodiment
The utility model is described in further detail below to utilize drawings and Examples.
With reference to figure, the small current system single-phase earth fault detection check device of the present embodiment is the application at the fault line selection of 10.5KV power distribution network small current system branch road insulation decline.Comprise the transformer 1 be connected with power distribution network, three groups are connected with bus 5 by current transformer 8 by auto-transformer 4, bus 5 is connected with branch line circuit 7, be connected with the singlephase earth fault mimic channel that simulation branch road electric capacity 6-1 or 6-2 or 6-3 and load 10 form on branch line circuit 7, the auto-transformer 4 of singlephase earth fault mimic channel is connected with transformer 1, is connected with voltage transformer (VT) 9 on bus 5.Auto-transformer 4 is connected with neutral resistance 2, neutral point arc suppression coil 3 in parallel.
When a certain branch line circuit 7 branch road generation earth faults, detected device is by residual voltage real-time acquisition system and voltage transformer (VT) 9, detected device is connected with current transformer 8 by the electric current real-time acquisition system, detected device is connected and carries out physical simulation experiment with auto-transformer 4 by the neutral point signals collecting, guarantees the safety of system and the standard-required that equipment networks; Analog bus voltage is got 1000V with per unit value the same terms simulation, and voltage transformer (VT) is 1000/100, current transformer is 5/1 ampere, is exactly that the secondary side Signals & Systems are identical; Simulation 10.5KV, its system insulation alarming value is zero sequence phase voltage 30V, can arrange 0 to full scale line voltage 100V, detecting the voltage of differentiating the verification scope can be 66KV, 33KV, 10.5KV.Detect the scope of differentiating adjustable at 0V-100V according to different electric pressures, can meet the system phenomenon, the simulation of 0uf-300uf tunable capacitor is set, can meet the phenomenon of system capacity current, also comprise and can simulate various neutral by arc extinction coil grounding, low resistance grounding, large resistance earthing and change system operation mode.The product that the detected connected residual voltage real-time acquisition system of device, electric current real-time acquisition system and neutral point signal acquiring system are commercially available prior art.
Claims (2)
1. a small current system single-phase earth fault detection check device, comprise the transformer be connected with power distribution network, it is characterized in that, also comprise that some groups are connected with bus by current transformer by auto-transformer, bus and branch line connection, be connected with the singlephase earth fault mimic channel that simulation branch road electric capacity and load form on the branch line circuit, the auto-transformer of singlephase earth fault mimic channel is connected with transformer, is connected with voltage transformer (VT) on bus.
2. small current system single-phase earth fault detection check device according to claim 1, is characterized in that, described auto-transformer is connected with neutral resistance, neutral point arc suppression coil in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220626503.6U CN202956482U (en) | 2012-11-23 | 2012-11-23 | Small current system single-phase grounding fault detection verifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220626503.6U CN202956482U (en) | 2012-11-23 | 2012-11-23 | Small current system single-phase grounding fault detection verifying device |
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| Publication Number | Publication Date |
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| CN202956482U true CN202956482U (en) | 2013-05-29 |
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| CN201220626503.6U Expired - Lifetime CN202956482U (en) | 2012-11-23 | 2012-11-23 | Small current system single-phase grounding fault detection verifying device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792505A (en) * | 2014-01-16 | 2014-05-14 | 国家电网公司 | Ground fault simulation device for electric power direct current system |
| CN103840438A (en) * | 2014-03-25 | 2014-06-04 | 浙江巨力电气有限公司 | Intelligent detecting system for detecting single phase grounding protection function of intelligent switch device based on 10kV neutral non-grounding distribution network system |
| CN110146763A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device test method and device and storage medium |
| CN113169544A (en) * | 2018-10-22 | 2021-07-23 | 西门子歌美飒可再生能源创新与技术有限公司 | Detection device and method for detecting a fault in a transformer of a wind turbine |
-
2012
- 2012-11-23 CN CN201220626503.6U patent/CN202956482U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792505A (en) * | 2014-01-16 | 2014-05-14 | 国家电网公司 | Ground fault simulation device for electric power direct current system |
| CN103792505B (en) * | 2014-01-16 | 2016-08-17 | 国家电网公司 | A kind of electric power DC system earth fault analog |
| CN103840438A (en) * | 2014-03-25 | 2014-06-04 | 浙江巨力电气有限公司 | Intelligent detecting system for detecting single phase grounding protection function of intelligent switch device based on 10kV neutral non-grounding distribution network system |
| CN103840438B (en) * | 2014-03-25 | 2017-12-26 | 浙江巨力电气有限公司 | The detecting system of the intellectualized switchgear ground protection function of distribution network systems |
| CN113169544A (en) * | 2018-10-22 | 2021-07-23 | 西门子歌美飒可再生能源创新与技术有限公司 | Detection device and method for detecting a fault in a transformer of a wind turbine |
| CN110146763A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device test method and device and storage medium |
| CN110146763B (en) * | 2019-06-05 | 2021-04-02 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device test method and device and storage medium |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130529 Effective date of abandoning: 20210913 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130529 Effective date of abandoning: 20210913 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |