CN103236681B - Rotor one-point grounding protection device - Google Patents
Rotor one-point grounding protection device Download PDFInfo
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- CN103236681B CN103236681B CN201310161963.5A CN201310161963A CN103236681B CN 103236681 B CN103236681 B CN 103236681B CN 201310161963 A CN201310161963 A CN 201310161963A CN 103236681 B CN103236681 B CN 103236681B
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- rotor
- connects
- capacitance
- excitation transformer
- ground connection
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Links
- 230000005284 excitation Effects 0.000 claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 32
- 229910052710 silicon Inorganic materials 0.000 claims description 26
- 239000010703 silicon Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Control Of Eletrric Generators (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses rotor one-point grounding protection device, comprise DC excitation transformer and the first loop of being connected with DC excitation transformer output and second servo loop; DC excitation transformer inputs connects the output circuit of generator; First loop comprises earthed circuit and measuring circuit; Earthed circuit one end connects the output of DC excitation transformer, its other end ground connection; Measuring circuit one end connects earthed circuit, its other end ground connection.Measuring circuit comprises overcurrent relay, superposition power supply and capacitance; One end of overcurrent relay connects the first terminals of the first rotor; The other end of overcurrent relay connects one end of superposition power supply; The other end of superposition power supply connects one end of capacitance; The other end ground connection of capacitance.The present invention effectively can improve the safety in production operation level of generator, basic eliminates because the loss that causes of letter by mistake, transformation conveniently, with low cost.
Description
Technical field
The present invention relates to a kind of earth protective device, be specifically related to rotor one-point grounding protection device.
Background technology
Generator, as stand-by power supply, is widely used in social all trades and professions.Generator generally comprises peripheral stator and rotating rotor in stator.The safe operation of generator plays conclusive effect to the normal operation and the quality of power supply that ensure electric power system; simultaneously generator itself is also very valuable electric elements; therefore; should for various different fault and irregular operating state, the protective relaying device of installing perfect performance.In prior art; generator rotor one-point grounding protection device is exactly a kind of common protective relaying device; the machine end of generator connected with computer type is after shunt excitation device; there is rotor one-point grounding protection frequently and transmit phenomenon by mistake; cause generator rotor one-point grounding protection failure of apparatus, need to make improvements.
Summary of the invention
The object of the present invention is to provide a kind of rotor one-point grounding protection device, it effectively can improve the safety in production operation level of generator, basic eliminates because the loss that causes of letter by mistake, transformation conveniently, with low cost.
In order to achieve the above object, the present invention is achieved through the following technical solutions: rotor one-point grounding protection device, is characterized in, comprises DC excitation transformer and the first loop of being connected with DC excitation transformer output and second servo loop;
Above-mentioned DC excitation transformer inputs connects the output circuit of generator;
The first above-mentioned loop comprises earthed circuit and measuring circuit;
Above-mentioned earthed circuit one end connects the output of DC excitation transformer, its other end ground connection;
Above-mentioned measuring circuit one end connects earthed circuit, its other end ground connection.
Above-mentioned earthed circuit comprises the first controllable silicon, the first rotor and the first electric capacity;
The first above-mentioned silicon controlled anode is connected with the output of DC excitation transformer;
The first above-mentioned silicon controlled negative electrode is connected with the first terminals of the first rotor;
The first above-mentioned silicon controlled controls pole and is connected with the second terminals of the first rotor;
First terminals of above-mentioned the first rotor connect measuring circuit;
The coil of above-mentioned the first rotor connects one end of the first electric capacity;
The other end ground connection of the first above-mentioned electric capacity.
Above-mentioned measuring circuit comprises overcurrent relay, superposition power supply and capacitance;
One end of above-mentioned overcurrent relay connects the first terminals of the first rotor;
The other end of above-mentioned overcurrent relay connects one end of superposition power supply;
The other end of above-mentioned superposition power supply connects one end of capacitance;
The other end ground connection of above-mentioned capacitance.
Above-mentioned second servo loop comprises the second controllable silicon, the second rotor and the second electric capacity;
The second above-mentioned silicon controlled anode is connected with the output of DC excitation transformer;
The second above-mentioned silicon controlled negative electrode is connected with bitrochanteric first terminals;
The second above-mentioned silicon controlled controls pole and is connected with bitrochanteric second terminals;
Above-mentioned bitrochanteric coil connects one end of the second electric capacity;
The other end ground connection of the second above-mentioned electric capacity.
The capacitance of above-mentioned capacitance is 2 microfarads.
Rotor one-point grounding protection device of the present invention compared with prior art has the following advantages: it effectively can improve the safety in production operation level of generator, the loss that basic elimination causes because of mistake letter; Transformation is convenient, with low cost.
Accompanying drawing explanation
Fig. 1 is rotor one-point grounding protection device overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As indicated with 1, rotor one-point grounding protection device, comprises DC excitation transformer T and the first loop 10 of being connected with DC excitation transformer T output and second servo loop 20; DC excitation transformer T input connects the output circuit of generator; First loop 10 comprises earthed circuit 11 and measuring circuit 12; Earthed circuit 11 one end connects the output of DC excitation transformer T, its other end ground connection; Measuring circuit 12 one end connects earthed circuit 11, its other end ground connection.Earthed circuit 11 comprises the first controllable silicon VT1, the first rotor 111 and the first electric capacity C1; The anode of the first controllable silicon VT1 is connected with the output of DC excitation transformer T; The negative electrode of the first controllable silicon VT1 is connected with the first terminals 1111 of the first rotor 111; The control pole of the first controllable silicon VT1 is connected with the second terminals 1112 of the first rotor 111; First terminals 1111 of the first rotor 111 connect measuring circuit 12; The coil 1113 of the first rotor 111 connects one end of the first electric capacity C1; The other end ground connection of the first electric capacity C1.Measuring circuit 12 comprises overcurrent relay K, superposition power supply U and capacitance C3; One end of overcurrent relay K connects the first terminals 1111 of the first rotor 111; The other end of overcurrent relay K connects one end of superposition power supply U; The other end of superposition power supply U connects one end of capacitance C3; The other end ground connection of capacitance C3.Second servo loop 20 comprises the second controllable silicon VT2, the second rotor 21 and the second electric capacity C2; The anode of the second controllable silicon VT2 is connected with the output of DC excitation transformer T; The negative electrode of the second controllable silicon VT2 is connected with the first terminals 211 of the second rotor 21; The control pole of the second controllable silicon VT2 is connected with the second terminals 212 of the second rotor 21; The coil 213 of the second rotor 21 connects one end of the second electric capacity C2; The other end ground connection of the second electric capacity C2.The capacitance of capacitance C3 is 2 microfarads, and capacitance C3 is solid aluminum electrochemical capacitor, uses welding manner to fix.
In formula: I
jfor the electric current flow through in earthing detection loop;
Z
ccapacitance;
Z
drotor earth impedance;
Z
jrelay internal resistance;
According to formula (1), Z
dreduce, I
jincrease, visible, when the first controllable silicon VT1 and the second controllable silicon VT2 conducting simultaneously, impedance ground is in parallel, and measurement impedance is diminished, and therefore by changing capacitance C3, the resistance value of measuring circuit 12 is increased to 3.15 kilohms.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (3)
1. rotor one-point grounding protection device, is characterized in that, comprises: DC excitation transformer (T) and the first loop (10) of being connected with DC excitation transformer (T) output and second servo loop (20);
Described DC excitation transformer (T) input connects the output circuit of generator;
Described the first loop (10) comprises earthed circuit (11) and measuring circuit (12);
Described earthed circuit (11) one end connects the output of DC excitation transformer (T), its other end ground connection;
Described measuring circuit (12) one end connects earthed circuit (11), its other end ground connection;
Described earthed circuit (11) comprises the first controllable silicon (VT1), the first rotor (111) and the first electric capacity (C1);
The anode of described the first controllable silicon (VT1) is connected with the output of DC excitation transformer (T);
The negative electrode of described the first controllable silicon (VT1) is connected with first terminals (1111) of the first rotor (111);
The control pole of described the first controllable silicon (VT1) is connected with second terminals (1112) of the first rotor (111);
First terminals (1111) of described the first rotor (111) connect measuring circuit (12);
The coil (1113) of described the first rotor (111) connects one end of the first electric capacity (C1);
The other end ground connection of described the first electric capacity (C1);
Described second servo loop (20) comprises the second controllable silicon (VT2), the second rotor (21) and the second electric capacity (C2);
The anode of described the second controllable silicon (VT2) is connected with the output of DC excitation transformer (T);
The negative electrode of described the second controllable silicon (VT2) is connected with first terminals (211) of the second rotor (21);
The control pole of described the second controllable silicon (VT2) is connected with second terminals (212) of the second rotor (21);
The coil (213) of described the second rotor (21) connects one end of the second electric capacity (C2);
The other end ground connection of described the second electric capacity (C2).
2. rotor one-point grounding protection device as claimed in claim 1, is characterized in that, described measuring circuit (12) comprises overcurrent relay (K), superposition power supply (U) and capacitance (C3);
One end of described overcurrent relay (K) connects first terminals (1111) of the first rotor (111);
The other end of described overcurrent relay (K) connects one end of superposition power supply (U);
The other end of described superposition power supply (U) connects one end of capacitance (C3);
The other end ground connection of described capacitance (C3).
3. rotor one-point grounding protection device as claimed in claim 2, it is characterized in that, the capacitance of described capacitance (C3) is 2 microfarads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310161963.5A CN103236681B (en) | 2013-05-06 | 2013-05-06 | Rotor one-point grounding protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310161963.5A CN103236681B (en) | 2013-05-06 | 2013-05-06 | Rotor one-point grounding protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103236681A CN103236681A (en) | 2013-08-07 |
| CN103236681B true CN103236681B (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310161963.5A Active CN103236681B (en) | 2013-05-06 | 2013-05-06 | Rotor one-point grounding protection device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741063A (en) * | 2010-03-04 | 2010-06-16 | 国电南瑞科技股份有限公司 | Redundancy sampling calculation-based superposed square-wave voltage type rotor earth-fault protection method |
| CN201774234U (en) * | 2010-08-27 | 2011-03-23 | 常州大道机械有限公司 | Grounding fault protector for generator rotor |
| CN102891474A (en) * | 2012-11-02 | 2013-01-23 | 南京国电南自美卓控制系统有限公司 | One-point grounding protective device of alternating-current and direct-current injection type rotors and protection method thereof |
| CN203289080U (en) * | 2013-05-06 | 2013-11-13 | 国家电网公司 | Rotor one-point-ground protection device |
-
2013
- 2013-05-06 CN CN201310161963.5A patent/CN103236681B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741063A (en) * | 2010-03-04 | 2010-06-16 | 国电南瑞科技股份有限公司 | Redundancy sampling calculation-based superposed square-wave voltage type rotor earth-fault protection method |
| CN201774234U (en) * | 2010-08-27 | 2011-03-23 | 常州大道机械有限公司 | Grounding fault protector for generator rotor |
| CN102891474A (en) * | 2012-11-02 | 2013-01-23 | 南京国电南自美卓控制系统有限公司 | One-point grounding protective device of alternating-current and direct-current injection type rotors and protection method thereof |
| CN203289080U (en) * | 2013-05-06 | 2013-11-13 | 国家电网公司 | Rotor one-point-ground protection device |
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| CN103236681A (en) | 2013-08-07 |
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