CN203289080U - Rotor one-point-ground protection device - Google Patents
Rotor one-point-ground protection device Download PDFInfo
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- CN203289080U CN203289080U CN2013202378148U CN201320237814U CN203289080U CN 203289080 U CN203289080 U CN 203289080U CN 2013202378148 U CN2013202378148 U CN 2013202378148U CN 201320237814 U CN201320237814 U CN 201320237814U CN 203289080 U CN203289080 U CN 203289080U
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- controllable silicon
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Abstract
The utility model discloses a rotor one-point-ground protection device which comprises a DC exciting transformer, and a first loop and a second loop which are connected with an output terminal of the DC exciting transformer; an input terminal of the DC exciting transformer is connected with an output circuit of a generator; the first loop comprises a ground circuit and a measurement circuit; one end of the ground circuit is connected with the output terminal of the DC exciting transformer, and the other end of the ground circuit is grounded; and one end of the measurement circuit is connected with the ground circuit, and the other end of the measurement circuit is grounded. The measurement circuit comprises an over-current relay, a superposed power supply and a blocking capacitor, wherein one end of the over-current relay is connected with a first wiring terminal of a first rotor, and the other end of the over-current relay is connected with one end of the superposed power supply; and the other end of the superposed power supply is connected with one end of the blocking capacitor, and the other end of the blocking capacitor is grounded. The rotor one-point-ground protection device has the advantages that safety production operation level of the generator can be effectively increased, losses caused by misunderstand can be mainly eliminated, and the rotor one-point-ground protection device is easy in reconstruction and low in cost.
Description
Technical field
The utility model relates to a kind of earth protective device, is specifically related to the 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 normal operation and the quality of power supply that guarantees electric power system; generator itself is also very valuable electric elements simultaneously; therefore; should be for various fault and irregular operating state, the protective relaying device of installing perfect performance.In prior art; the 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 the shunt excitation device; rotor one-point grounding protection frequently occurs miss the phenomenon of posting a letter; cause the generator rotor one-point grounding protection failure of apparatus, need to make improvements.
The utility model content
The purpose of this utility model is to provide a kind of rotor one-point grounding protection device, and it can effectively improve the safety in production operation level of generator, the loss that basic elimination causes because of the mistake letter, and transformation is convenient, with low cost.
In order to achieve the above object, the utility model is achieved through the following technical solutions: the rotor one-point grounding protection device is characterized in the first loop and the second servo loop that comprise the DC excitation transformer and with DC excitation transformer output, be connected;
Above-mentioned DC excitation transformer input 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 is controlled the utmost point and is connected with the second terminals of the first rotor;
The first terminals of above-mentioned the first rotor connect measuring circuit;
The coil of above-mentioned the first rotor connects an 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, stack 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 an end of stack power supply;
The other end of above-mentioned stack power supply connects an 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 the first terminals;
The second above-mentioned silicon controlled is controlled the utmost point and is connected with bitrochanteric the second terminals;
Above-mentioned bitrochanteric coil connects an 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.
The utility model rotor one-point grounding protection device compared with prior art has the following advantages: it can effectively improve the safety in production operation level of generator, the basic elimination because the loss that the mistake letter causes; Transformation is convenient, with low cost.
Description of drawings
Fig. 1 is the utility model rotor one-point grounding protection device overall structure schematic diagram.
Embodiment
, below in conjunction with accompanying drawing, by describing a better specific embodiment in detail, the utility model is further elaborated.
As shown in 1, rotor one-point grounding protection device, the first loop 10 and second servo loop 20 that comprises DC excitation transformer T and with DC excitation transformer T output, be connected; DC excitation transformer T input connects the output circuit of generator; The first loop 10 comprises earthed circuit 11 and measuring circuit 12; Earthed circuit 11 1 ends connect the output of DC excitation transformer T, its other end ground connection; Measuring circuit 12 1 ends connect earthed circuit 11, its other end ground connection.Earthed circuit 11 comprises the first controllable silicon VT1, the first rotor 111 and the first capacitor C 1; 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 utmost point of the first controllable silicon VT1 is connected with the second terminals 1112 of the first rotor 111; The first terminals 1111 of the first rotor 111 connect measuring circuit 12; The coil 1113 of the first rotor 111 connects an end of the first capacitor C 1; The other end ground connection of the first capacitor C 1.Measuring circuit 12 comprises overcurrent relay K, stack power supply U and capacitance C3; The end of overcurrent relay K connects the first terminals 1111 of the first rotor 111; The other end of overcurrent relay K connects the end of stack power supply U; The other end of stack power supply U connects the 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 capacitor C 2; 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 utmost point 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 an end of the second capacitor C 2; The other end ground connection of the second capacitor C 2.The capacitance of capacitance C3 is 2 microfarads, and capacitance C3 is the solid aluminum electrochemical capacitor, uses welding manner to fix.
In formula: I
jDetect the electric current that flows through in loop for ground connection;
Z
cCapacitance;
Z
dThe rotor earth impedance;
Z
jThe relay internal resistance;
According to formula (1), Z
dReduce I
jIncrease, as seen, when the first controllable silicon VT1 and the second controllable silicon VT2 conducting simultaneously, impedance ground is in parallel, and the 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 utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute will be all apparent.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (5)
1. the rotor one-point grounding protection device, is characterized in that, comprises: DC excitation transformer (T) and the first loop (10) and second servo loop (20) that are connected with DC excitation transformer (T) output;
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 ends connect the output of DC excitation transformer (T), its other end ground connection;
Described measuring circuit (12) one ends connect earthed circuit (11), its other end ground connection.
2. rotor one-point grounding protection device as claimed in claim 1, is characterized in that, 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 utmost point 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 an end of the first electric capacity (C1);
The other end ground connection of described the first electric capacity (C1).
3. rotor one-point grounding protection device as claimed in claim 1, is characterized in that, described measuring circuit (12) comprises overcurrent relay (K), stack 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 an end of stack power supply (U);
The other end of described stack power supply (U) connects an end of capacitance (C3);
The other end ground connection of described capacitance (C3).
4. rotor one-point grounding protection device as claimed in claim 1, is characterized in that, 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 utmost point 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 an end of the second electric capacity (C2);
The other end ground connection of described the second electric capacity (C2).
5. rotor one-point grounding protection device as claimed in claim 3, is characterized in that, the capacitance of described capacitance (C3) is 2 microfarads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202378148U CN203289080U (en) | 2013-05-06 | 2013-05-06 | Rotor one-point-ground protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202378148U CN203289080U (en) | 2013-05-06 | 2013-05-06 | Rotor one-point-ground protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289080U true CN203289080U (en) | 2013-11-13 |
Family
ID=49545424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202378148U Expired - Lifetime CN203289080U (en) | 2013-05-06 | 2013-05-06 | Rotor one-point-ground protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203289080U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236681A (en) * | 2013-05-06 | 2013-08-07 | 国家电网公司 | Rotor one-point grounding protection device |
| CN103630837A (en) * | 2013-12-07 | 2014-03-12 | 大唐鸡西第二热电有限公司 | Generator rotor grounding detection circuit |
-
2013
- 2013-05-06 CN CN2013202378148U patent/CN203289080U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236681A (en) * | 2013-05-06 | 2013-08-07 | 国家电网公司 | Rotor one-point grounding protection device |
| CN103236681B (en) * | 2013-05-06 | 2016-04-27 | 国家电网公司 | Rotor one-point grounding protection device |
| CN103630837A (en) * | 2013-12-07 | 2014-03-12 | 大唐鸡西第二热电有限公司 | Generator rotor grounding detection circuit |
| CN103630837B (en) * | 2013-12-07 | 2017-01-04 | 大唐鸡西第二热电有限公司 | Generator rotor ground testing circuit |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |