CN202870134U - Three-phase automatic earthing device - Google Patents
Three-phase automatic earthing device Download PDFInfo
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- CN202870134U CN202870134U CN 201220285034 CN201220285034U CN202870134U CN 202870134 U CN202870134 U CN 202870134U CN 201220285034 CN201220285034 CN 201220285034 CN 201220285034 U CN201220285034 U CN 201220285034U CN 202870134 U CN202870134 U CN 202870134U
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Abstract
The utility model provides a three-phase automatic earthing device characterized by comprising three voltage transformers, three capacitive voltage dividers, a vacuum contactor, inductors, resistors, and other parts. The three-phase automatic earthing device is advantaged in that the device can be used for realizing automatic earthing in a power frequency high pressure test system; the work efficiency is substantially increased through the device; and the device is beneficial for the conduction of a test.
Description
Technical field
The utility model relates to a kind of automatic ground protection device for the industrial frequency AC withstand voltage test.
Background technology
Power equipment is in operation, and it is deteriorated that insulation can be occured by the effect of electric field, temperature and mechanical vibration for a long time gradually, and is deteriorated deteriorated with part comprising integral body, forms defective.The industrial frequency AC withstand voltage test is to identify the effective and the most direct method of Electric Power Equipment Insulation intensity, is an important content of preventive trial.In addition, because AC voltage withstand test voltage is generally high than working voltage, therefore by after the test, equipment has larger margin of safety, so AC voltage withstand test is a kind of important means that guarantees the power equipment safety operation.
AC voltage withstand test generally adopts the Power Frequency High Voltage Test system to finish, and it mainly comprises three of microcomputer control cabinets, PLC switch board, three-phase transformer, pressure regulator cabinet etc.But present Power Frequency High Voltage Test system generally all lacks the device that can realize automatic earthing, thereby has reduced the work efficiency of whole system, and is unfavorable for effectively carrying out of industrial frequency AC withstand voltage test.
Summary of the invention
The purpose of this utility model provides a kind of automatic earthing device that can be used in the Power Frequency High Voltage Test system.
In order to achieve the above object, the technical solution of the utility model has provided a kind of three-phase automatic earthing device, it is characterized in that, comprise transformer, the primary coil of transformer connects respectively the A phase, the B phase, the output of C phase voltage regulator, its secondary coil is formed with respectively a pair of A and exports mutually tap pair, a pair of B export mutually tap to and a pair of C export mutually tap pair, A exports tap pair mutually, B export mutually tap to and the C tap of exporting mutually tap centering pass respectively the A phase current mutual inductor, ground connection behind B phase current mutual inductor and the C phase current mutual inductor, parallel resistance R1 and the first discharge tube form the first parallel circuit on the A phase current mutual inductor, parallel resistance R2 and the second discharge tube form the second parallel circuit on the B phase current mutual inductor, parallel resistance R3 and the 3rd discharge tube form the 3rd parallel circuit on the C phase current mutual inductor, the first parallel circuit, one end of the second parallel circuit and the 3rd parallel circuit is drawn respectively A phase current signal end, B phase current signal end and C phase current signal end, the first voltage transformer (VT), one end of the primary coil of second voltage mutual inductor and tertiary voltage mutual inductor respectively with the first parallel circuit, the other end of the second parallel circuit and the 3rd parallel circuit links to each other, A exports tap pair mutually, B exports tap centering is exported in tap mutually to reaching C another tap difference series inductance L1 mutually, inductance L 2 and inductance L 3, the first voltage transformer (VT), the other end of the primary coil of second voltage mutual inductor and tertiary voltage mutual inductor accesses respectively transformer and inductance L 1, between inductance L 2 and the inductance L 3, at the first voltage transformer (VT), the 4th discharge tube respectively in parallel on the secondary coil of second voltage mutual inductor and tertiary voltage mutual inductor, the 5th discharge tube and the 6th discharge tube, also lead to respectively the first voltage signal end thereon, second voltage signal end and tertiary voltage signal end, inductance L 1, inductance L 2 and inductance L 3 connect an end of contactor, the other end of contactor is resistance in series R4 respectively, resistance R 5 and resistance R 6 rear ground connection, in inductance L 1, lead to respectively A phase test product incoming end on the circuit between inductance L 2 and inductance L 3 and the contactor, B phase test product incoming end and C phase test product incoming end, the first capacitive divider, the second capacitive divider and the 3rd capacitive divider access respectively inductance L 1, between inductance L 2 and inductance L 3 and the contactor, at the first capacitive divider, lead to respectively the first breakdown signal end on the second capacitive divider and the 3rd capacitive divider, the second breakdown signal end and the 3rd breakdown signal end.
The utility model has the advantages that provides a kind of device of realizing automatic earthing in the Power Frequency High Voltage Test system that can be used in, and has greatly improved work efficiency by this device, is conducive to the carrying out of testing.
Description of drawings
The circuit diagram of a kind of three-phase automatic earthing device that Fig. 1 provides for the utility model.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and cooperate accompanying drawing to be described in detail below.
As shown in Figure 1, a kind of three-phase automatic earthing device that the utility model provides, it is characterized in that, comprise transformer T4, the primary coil of transformer T4 connects respectively the A phase, the B phase, the output of C phase voltage regulator, its secondary coil is formed with respectively a pair of A and exports mutually tap pair, a pair of B export mutually tap to and a pair of C export mutually tap pair, A exports tap pair mutually, B export mutually tap to and the C tap of exporting mutually tap centering pass respectively A phase current mutual inductor TA4, ground connection behind B phase current mutual inductor TA5 and the C phase current mutual inductor TA6, parallel resistance R1 and the first discharge tube SG1 form the first parallel circuit on A phase current mutual inductor TA4, parallel resistance R2 and the second discharge tube SG2 form the second parallel circuit on B phase current mutual inductor TA5, parallel resistance R3 and the 3rd discharge tube SG3 form the 3rd parallel circuit on C phase current mutual inductor TA6, the first parallel circuit, one end of the second parallel circuit and the 3rd parallel circuit is drawn respectively A phase current signal end 761, B phase current signal end 762 and C phase current signal end 763, the first voltage transformer (VT) TV1, one end of the primary coil of second voltage mutual inductor TV2 and tertiary voltage mutual inductor TV3 respectively with the first parallel circuit, the other end of the second parallel circuit and the 3rd parallel circuit links to each other, A exports tap pair mutually, B exports tap centering is exported in tap mutually to reaching C another tap difference series inductance L1 mutually, inductance L 2 and inductance L 3, the first voltage transformer (VT) TV1, the other end of the primary coil of second voltage mutual inductor TV2 and tertiary voltage mutual inductor TV3 accesses respectively transformer T4 and inductance L 1, between inductance L 2 and the inductance L 3, at the first voltage transformer (VT) TV1, the 4th discharge tube SG4 respectively in parallel on the secondary coil of second voltage mutual inductor TV2 and tertiary voltage mutual inductor TV3, the 5th discharge tube SG5 and the 6th discharge tube SG6, also lead to respectively the first voltage signal end 741 thereon, second voltage signal end 742 and tertiary voltage signal end 743, inductance L 1, inductance L 2 and inductance L 3 connect the end of contactor KM4, the other end of contactor KM4 is resistance in series R4 respectively, resistance R 5 and resistance R 6 rear ground connection, in inductance L 1, lead to respectively A phase test product incoming end A on the circuit between inductance L 2 and inductance L 3 and the contactor KM4, B phase test product incoming end B and C phase test product incoming end C, the first capacitive divider CVDA, the second capacitive divider CVDB and the 3rd capacitive divider CVDC access respectively inductance L 1, between inductance L 2 and inductance L 3 and the contactor KM4, at the first capacitive divider CVDA, lead to respectively the first breakdown signal end 781 on the second capacitive divider CVDB and the 3rd capacitive divider CVDC, the second breakdown signal end 782 and the 3rd breakdown signal end 783.
This automatic ground protection device is by PLC control contactor KM4.As A, B, when C three-phase any closes a floodgate mutually, come the road no power of control contactor KM4 by corresponding relay, this moment, contactor KM4 dead electricity was separated automatically, and automatic earthing device is not worked, and closes a floodgate behind A, B, the C three phase delay 2S.Behind A, B, the whole separating brakes of C three-phase, the a-road-through of control contactor KM4 electricity, the coil electricity work of contactor KM4, the contactor automatic pick, this moment, the automatic earthing protective effect was played in automatic earthing device work.
Claims (1)
1. three-phase automatic earthing device, it is characterized in that, comprise transformer (T4), the primary coil of transformer (T4) connects respectively the A phase, the B phase, the output of C phase voltage regulator, its secondary coil is formed with respectively a pair of A and exports mutually tap pair, a pair of B export mutually tap to and a pair of C export mutually tap pair, A exports tap pair mutually, B export mutually tap to and the C tap of exporting mutually tap centering pass respectively A phase current mutual inductor (TA4), ground connection behind B phase current mutual inductor (TA5) and the C phase current mutual inductor (TA6), form the first parallel circuit at the upper parallel resistance R1 of A phase current mutual inductor (TA4) and the first discharge tube (SG1), form the second parallel circuit at the upper parallel resistance R2 of B phase current mutual inductor (TA5) and the second discharge tube (SG2), form the 3rd parallel circuit at the upper parallel resistance R3 of C phase current mutual inductor (TA6) and the 3rd discharge tube (SG3), the first parallel circuit, one end of the second parallel circuit and the 3rd parallel circuit is drawn respectively A phase current signal end (761), B phase current signal end (762) and C phase current signal end (763), the first voltage transformer (VT) (TV1), one end of the primary coil of second voltage mutual inductor (TV2) and tertiary voltage mutual inductor (TV3) respectively with the first parallel circuit, the other end of the second parallel circuit and the 3rd parallel circuit links to each other, A exports tap pair mutually, B exports tap centering is exported in tap mutually to reaching C another tap difference series inductance L1 mutually, inductance L 2 and inductance L 3, the first voltage transformer (VT) (TV1), the other end of the primary coil of second voltage mutual inductor (TV2) and tertiary voltage mutual inductor (TV3) accesses respectively transformer (T4) and inductance L 1, between inductance L 2 and the inductance L 3, at the first voltage transformer (VT) (TV1), the 4th discharge tube (SG4) respectively in parallel on the secondary coil of second voltage mutual inductor (TV2) and tertiary voltage mutual inductor (TV3), the 5th discharge tube (SG5) and the 6th discharge tube (SG6), also lead to respectively the first voltage signal end (741) thereon, second voltage signal end (742) and tertiary voltage signal end (743), inductance L 1, inductance L 2 and inductance L 3 connect an end of contactor (KM4), the other end of contactor (KM4) is resistance in series R4 respectively, resistance R 5 and resistance R 6 rear ground connection, in inductance L 1, lead to respectively A phase test product incoming end (A) on the circuit between inductance L 2 and inductance L 3 and the contactor (KM4), B phase test product incoming end (B) and C phase test product incoming end (C), the first capacitive divider (CVDA), the second capacitive divider (CVDB) and the 3rd capacitive divider (CVDC) access respectively inductance L 1, between inductance L 2 and inductance L 3 and the contactor (KM4), at the first capacitive divider (CVDA), lead to respectively the first breakdown signal end (781) on the second capacitive divider (CVDB) and the 3rd capacitive divider (CVDC), the second breakdown signal end (782) and the 3rd breakdown signal end (783).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220285034 CN202870134U (en) | 2012-06-15 | 2012-06-15 | Three-phase automatic earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220285034 CN202870134U (en) | 2012-06-15 | 2012-06-15 | Three-phase automatic earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870134U true CN202870134U (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220285034 Expired - Fee Related CN202870134U (en) | 2012-06-15 | 2012-06-15 | Three-phase automatic earthing device |
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| Country | Link |
|---|---|
| CN (1) | CN202870134U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977001A (en) * | 2016-07-19 | 2016-09-28 | 国家电网公司 | 10 kV automatic grounding alternating current transformer |
-
2012
- 2012-06-15 CN CN 201220285034 patent/CN202870134U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977001A (en) * | 2016-07-19 | 2016-09-28 | 国家电网公司 | 10 kV automatic grounding alternating current transformer |
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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 |
Granted publication date: 20130410 Termination date: 20180615 |
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| CF01 | Termination of patent right due to non-payment of annual fee |