CN204179655U - For the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer - Google Patents
For the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer Download PDFInfo
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- CN204179655U CN204179655U CN201420703786.9U CN201420703786U CN204179655U CN 204179655 U CN204179655 U CN 204179655U CN 201420703786 U CN201420703786 U CN 201420703786U CN 204179655 U CN204179655 U CN 204179655U
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- Prior art keywords
- potential transformer
- rectification circuit
- electromagnetic potential
- switching device
- control switching
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- 230000008030 elimination Effects 0.000 title claims abstract description 15
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of secondary direct current harmonic elimination apparatus for electromagnetic potential transformer, comprise rectification circuit, full control switching device and discharge resistance, the AC link of described rectification circuit is connected with the link of the open-triangular winding of electromagnetic potential transformer, the DC side link of described rectification circuit, entirely control switching device, discharge resistance three connects and forms loop; Described full control switching device is the one in insulated gate bipolar translator power tube IGBT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO; Described rectification circuit is the single-phase uncontrollable rectifier bridge be made up of four rectifier diodes.The ferro-resonance over-voltage that the utility model can not only fast and effeciently suppress electromagnetic potential transformer to cause, also can not have influence on the normal of system and asymmetric operation mode simultaneously, thus effectively improving the security and stability of power system operation, structure is simple.
Description
Technical field
The utility model relates to voltage transformer harmonic elimination technology, is specifically related to a kind of secondary direct current harmonic elimination apparatus for electromagnetic potential transformer.
Background technology
In isolated neutral distribution network systems; in order to surveillance three phase-to-ground voltage, carry out watt metering or protection; the electromagnetic potential transformer that bus is installed adopts the Y0/ Y0/ open delta mode of connection usually, and a winding is connected into star, neutral-point solid ground.But, when occurring in circuit that single-phase arc grounding disappears automatically, bus-tie circuit breaker closing operation or system loading acute variation time, the transient state impact process produced can excite ferro resonance phenomenon between electromagnetic potential transformer and three-phase conducting wire direct-to-ground capacitance.Electromagnetic potential transformer generation ferro resonance phenomenon is maximum a kind of internal cause overvoltage phenomenon that the most frequently occurs in power distribution network and cause the accident, it not only can cause system overvoltage, and the accidents such as voltage transformer overcurrent, fuse melting, even blast can be caused, badly influence the safe operation of power distribution network.
At present, the secondary harmonic elimination method of ferromagnetic resonance for electromagnetic voltage transformer is suppressed to be mainly the less damping resistance of electromagnetic potential transformer open-triangular winding two ends access.Although this method can suppress voltage transformer generation ferro resonance preferably; but also bring certain negative effect to system, as: larger circulation can be produced during system single-phase earthing on open-triangular winding, the regular event of relaying protection also can be affected.
Utility model content
The technical problems to be solved in the utility model is: for the above-mentioned defect of prior art, a kind of ferro-resonance over-voltage that can not only fast and effeciently suppress electromagnetic potential transformer to cause is provided, also can not have influence on the normal of system and asymmetric operation mode simultaneously, thus effectively improving the security and stability of power system operation, structure is simply for the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of secondary direct current harmonic elimination apparatus for electromagnetic potential transformer, comprise rectification circuit, full control switching device and discharge resistance, AC two links of described rectification circuit are connected with two links of the open-triangular winding of electromagnetic potential transformer, DC side two links of described rectification circuit, entirely control switching device, discharge resistance three connects and forms loop.
Described full control switching device is the one in insulated gate bipolar translator power tube IGBT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO.
Described rectification circuit is the single-phase uncontrollable rectifier bridge be made up of four rectifier diodes.
The secondary direct current harmonic elimination apparatus that the utility model is used for electromagnetic potential transformer has following advantage:
1, the utility model comprises rectification circuit, full control switching device and discharge resistance, AC two links of rectification circuit are connected with two links of the open-triangular winding of electromagnetic potential transformer, DC side two links of rectification circuit, entirely control switching device, discharge resistance three connects and forms loop; When electromagnetic potential transformer generation ferro resonance, control entirely to control switch device conductive, can resonant energy be absorbed and eliminate rapidly ferro resonance; When open-triangular winding both end voltage is lower than limit value, controls full control switching device and recover off state rapidly; When system asymmetric operation, return to off state after controlling full control switching device alternate conduction/shutoff 3 ~ 9 times and provide ground signalling, the ferro-resonance over-voltage that can not only fast and effeciently suppress electromagnetic potential transformer to cause like this, also can not have influence on the normal of system and asymmetric operation mode simultaneously, thus effectively improve the security and stability of power system operation.
2, prior art may occur blocking failure phenomenon based on the secondary harmonic elimination system that silicon controlled microcomputer resonance eliminator is formed, and the utility model adopts the secondary direct current harmonic elimination system formed based on full control switching device, direct current can be turned off and there will not be blocking-up failure phenomenon, improve the reliability of system.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the utility model embodiment.
Marginal data: 1, rectification circuit; 2, fly-wheel diode; 3, full switching device is controlled; 4, discharge resistance; 5, three-phase winding; 6, three-phase secondary winding; 7, open-triangular winding; 8, electrical network three-phase bus.
Embodiment
As shown in Figure 1, the secondary direct current harmonic elimination apparatus that the present embodiment is used for electromagnetic potential transformer comprises rectification circuit 1, full control switching device 3 and discharge resistance 4, AC two link a of rectification circuit 1 are connected with two link b of the open-triangular winding 7 of electromagnetic potential transformer, and DC side two link c of rectification circuit 1, full control switching device 3, discharge resistance 4 three connect and form loop.
As shown in Figure 1, electromagnetic potential transformer is made up of three-phase winding 5, three-phase secondary winding 6 and open-triangular winding 7, and the outlet of its three-phase winding 5 is connected to electrical network three-phase bus 8 respectively, and the direct ground connection of neutral point n of a three-phase winding 5; AC two link a of rectification circuit 1 are connected with two link b of the open-triangular winding 7 of electromagnetic potential transformer.
In the present embodiment, full control switching device 3 controls switching device entirely for being with fly-wheel diode 2, is specially insulated gate bipolar translator power tube IGBT.In addition, full control switching device 3 also can select integrated gate commutated thyristor IGCT or turn-off thyristor GTO as required.
In the present embodiment, rectification circuit 1 is the single-phase uncontrollable rectifier bridge be made up of four rectifier diodes.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1. the secondary direct current harmonic elimination apparatus for electromagnetic potential transformer, it is characterized in that: comprise rectification circuit (1), entirely control switching device (3) and discharge resistance (4), AC two links of described rectification circuit (1) are connected with two links of the open-triangular winding (7) of electromagnetic potential transformer, DC side two links of described rectification circuit (1), entirely control switching device (3), discharge resistance (4) three connects and forms loop.
2. the secondary direct current harmonic elimination apparatus for electromagnetic potential transformer according to claim 1, is characterized in that: described full control switching device (3) is insulated gate bipolar translator power tube IGBT, one in integrated gate commutated thyristor IGCT and turn-off thyristor GTO.
3. the secondary direct current harmonic elimination apparatus for electromagnetic potential transformer according to claim 1 and 2, is characterized in that: described rectification circuit (1) is the single-phase uncontrollable rectifier bridge be made up of four rectifier diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420703786.9U CN204179655U (en) | 2014-11-21 | 2014-11-21 | For the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420703786.9U CN204179655U (en) | 2014-11-21 | 2014-11-21 | For the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204179655U true CN204179655U (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420703786.9U Expired - Fee Related CN204179655U (en) | 2014-11-21 | 2014-11-21 | For the secondary direct current harmonic elimination apparatus of electromagnetic potential transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN204179655U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377679A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary direct-current resonance elimination device used for electromagnetic type voltage transformer |
-
2014
- 2014-11-21 CN CN201420703786.9U patent/CN204179655U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377679A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Secondary direct-current resonance elimination device used for electromagnetic type voltage 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: 20150225 Termination date: 20201121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |