CN105182019A - Device and system for reducing number of fusing times of fuse protector - Google Patents
Device and system for reducing number of fusing times of fuse protector Download PDFInfo
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- CN105182019A CN105182019A CN201510543508.0A CN201510543508A CN105182019A CN 105182019 A CN105182019 A CN 105182019A CN 201510543508 A CN201510543508 A CN 201510543508A CN 105182019 A CN105182019 A CN 105182019A
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Abstract
The invention discloses a device and a system for reducing number of fusing times of a fuse protector, which is applicable to the fuse protector which is connected to the three-phase bus and is applicable in the three-phase type voltage mutual inductor. A primary side winding of a three-phase type voltage transformer is correspondingly connected to a three-phase bus; secondary side windings of the three-phase type voltage transformer are an astroid structure and an opened triangle structure. The device disclosed by the invention comprises a zero sequence voltage mutual inductor and a harmonic elimination resistor, and the device can effectively overcome the fusing caused by the capacitor discharging impact flow after the recovery of the single-phase grounding fault through accessing the zero sequence voltage mutual inductor to a neutral point of the primary side of the voltage mutual inductor and accessing the harmonic elimination resistor to the open triangle of the secondary side of the voltage mutual inductor . As a result, the number of fusing times of the fuse protector is reduced. Furthermore, the device is simple in structure, low in cost, easy in operation, high in reliability and good in stability. Besides, the invention also discloses a system containing the device.
Description
Technical field
The present invention relates to technical field of electric power, particularly relate to a kind of Apparatus and system reducing the fusing number of times of fuse.
Background technology
In prior art, the primary side of the voltage transformer (VT) be connected with substation bus bar is connected to resonance eliminator, and one end of voltage transformer (VT) is connected with bus, and the other end (neutral point) is by resonance eliminator ground connection.Resonance eliminator is the damping device of protection voltage transformer (VT) primary side, the resonance be used in harmonic elimination electrical network.In the web frame of city; because supply line is shorter; therefore resonance eliminator effectively can reduce the failure rate of voltage transformer (VT) primary side fuse blows; but in rural power network framework; because supply line is concentrated not; circuit is long, even if there is the protection of resonance eliminator that the fault of voltage transformer (VT) primary side fuse blows also often occurs.
Therefore, the number of times how reducing voltage transformer (VT) primary side fuse blows is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
The object of this invention is to provide a kind of device reducing the fusing number of times of fuse, for reducing the number of times of voltage transformer (VT) primary side fuse blows.In addition, object of the present invention also provides a kind of system comprising this device.
For solving the problems of the technologies described above, the invention provides a kind of device reducing the fusing number of times of fuse, be applied in the system of fuse and the three-phase type voltage transformer (VT) be connected with three-phase bus, the first side winding of described three-phase type voltage transformer (VT) is corresponding with described three-phase bus to be connected, the secondary side winding of described three-phase type voltage transformer (VT) is respectively star structure and open-delta structure, comprising:
The zero sequential potential transformer be connected with neutral point and the earth terminal of described three-phase type voltage transformer (VT) primary side;
The harmonic elimination resistance be connected with the described open-delta of described three-phase type voltage transformer secondary side.
Preferably, the line voltage of described three-phase type voltage transformer (VT) primary side is 10KV.
Preferably, the line voltage of described three-phase type voltage transformer secondary side is 100V.
Preferably, the resistance value of described harmonic elimination resistance is 200 ohm, and power is 200 watts.
Preferably, the support for fixing described zero sequential potential transformer is also comprised.
Preferably, the watch-dog of the voltage of the secondary side for gathering described zero sequential potential transformer is also comprised.
Reduce a system for the fusing number of times of fuse, comprise the device of the fusing number of times of reduction fuse described above, the three-phase type voltage transformer (VT) also comprising described fuse and be connected with described fuse.
The device of the fusing number of times of reduction fuse provided by the present invention, by the neutral point access zero sequential potential transformer at voltage transformer (VT) primary side and the open-delta access harmonic elimination resistance at voltage transformer secondary side, effectively can overcome the fusing that the capacitor discharge dash current after singlephase earth fault recovery causes, therefore, the fusing number of times of fuse is reduced.In addition, this apparatus structure is simple, and advantage of lower cost, easily operates, and reliability is high, good stability.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural drawing reducing the device of the fusing number of times of fuse provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisite, and the every other embodiment obtained, all belongs to scope.
Core of the present invention is to provide a kind of Apparatus and system reducing the fusing number of times of fuse.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Voltage transformer (VT) is one of protective device important between connection bus and user, once voltage transformer (VT) breaks down, then must carry out elimination work immediately according to Electric Power Generating Equipment operating standard, otherwise affect the ruuning situation of whole electrical network.If frequently fused at the fuse of voltage transformer (VT) primary side, not only have a strong impact on the accuracy of watt metering, and impact be also result on system safety operation.Therefore, in concrete enforcement, the fusing number of times of less fuse is as far as possible needed.
Embodiment one
In 10kV neutral point ungrounded electric network, the problem of the voltage transformer (VT) primary side fuse blows caused due to system single-phase earth fault happens occasionally, and even causes PT to explode, the safe operation of serious threat electrical network time serious.Voltage transformer (VT) primary side fuse blows is inevitable be there occurs enough long excess current because of voltage transformer (VT) primary side or has occurred stronger moment impact electric current.The main cause of voltage transformer (VT) primary side fuse blows causes superpotential due to system generation ferroresonance, and finally result in fuse blows, but when line length is greater than certain value, the main cause of fuse blows is not ferroresonance, but the capacitor discharge dash current after being recovered by singlephase earth fault causes.Therefore, for the purpose of the capacitor discharge dash current of the present invention after reducing singlephase earth fault recovery, a kind of device reducing the fusing number of times of fuse is provided, be applied in the system of fuse and the three-phase type voltage transformer (VT) be connected with three-phase bus, the first side winding of three-phase type voltage transformer (VT) is corresponding with described three-phase bus to be connected, the secondary side winding of described three-phase type voltage transformer (VT) is respectively star structure and open-delta structure, and this device comprises:
The zero sequential potential transformer be connected with neutral point and the earth terminal of described three-phase type voltage transformer (VT) primary side;
The harmonic elimination resistance be connected with the described open-delta of described three-phase type voltage transformer secondary side.
Fig. 1 is a kind of structural drawing reducing the device of the fusing number of times of fuse provided by the invention.This device comprises zero sequential potential transformer 10 and harmonic elimination resistance R.The two application scenarios is in the system of fuse and the three-phase type voltage transformer (VT) be connected with three-phase bus A, B and C.As shown in Figure 1, the first side winding of three-phase type voltage transformer (VT) is corresponding with three-phase bus A, B and C to be connected, and the secondary side winding of three-phase type voltage transformer (VT) has two, adopts Y-connection mode and open-delta connected mode respectively.The common point ground connection of winding a, b and c of Y-connection mode, a tie point ground connection of the winding of open-delta connected mode, to connect a harmonic elimination resistance R at opening part m and n.Wherein, the line voltage of three-phase type voltage transformer (VT) primary side described above can be 10KV.The line voltage of three-phase type voltage transformer secondary side described above can be 100V.The resistance value of described harmonic elimination resistance can be 200 ohm, and power is 200 watts.
On the basis of said structure, when system generation singlephase earth fault, voltage transformer (VT) neutral point has phase voltage to produce over the ground, the voltage of ungrounded phase is elevated to line voltage, capacitance current can be flow through in trouble spot, its ground capacitance keeps the electric charge corresponding to line voltage, and during earth fault, capacitance current circulates between power supply-wire-the earth.When after system earth failure vanishes, the current path be equivalent to wire electric charge leads to the earth with earth point cuts off, now the voltage of healthy phases will return to normal phase voltage, therefore the ungrounded electric charge accumulated mutually is only had and is discharged over the ground by voltage transformer (VT), this process will produce very large ultra-low frequency oscillation electric current, due to the feature of rural power grids electric network composition, if adopt resonance eliminator to be not enough to eliminate this capacitance current, only have the high reactance by the harmonic elimination resistance of zero sequential potential transformer and secondary side and damping resistance, ultra-low frequency oscillation current amplitude just can be made to obtain maximum suppression.Therefore, it is possible to reduce the number of times of the fusing that the capacitor discharge dash current after due to one-way earth fault recovery causes.
The device of the fusing number of times of the reduction fuse that the present embodiment provides, by the neutral point access zero sequential potential transformer at voltage transformer (VT) primary side and the open-delta access harmonic elimination resistance at voltage transformer secondary side, effectively can overcome the fusing that the capacitor discharge dash current after singlephase earth fault recovery causes, therefore, the fusing number of times of fuse is reduced.In addition, this apparatus structure is simple, and advantage of lower cost, easily operates, and reliability is high, good stability.
In order to the effect of this device is described, when the present invention provides the fusing number of times (see table 1) of fuse when not adopting this device and adopts this device, the fusing number of times (see table 2) of fuse compares.
Table 1
Table 2
Clearly can learn that the device that the application of the invention provides can reduce the number of times of fuse blows effectively by table 1 and table 2.
As one preferred embodiment, the support for fixing described zero sequential potential transformer is also comprised.
In order to make this device comparatively stable and firmly, therefore, the present invention provides special stand, for fixing for zero sequential potential transformer.
As one preferred embodiment, the watch-dog of the voltage of the secondary side for gathering described zero sequential potential transformer is also comprised.
Conveniently gather the voltage of zero sequential potential transformer secondary side, to monitor, the invention provides and the voltage of zero sequential potential transformer secondary side is uploaded to watch-dog, so that staff's surveillance equipment Grounding.
Embodiment two
The present invention also provides a kind of system of device of fusing number of times of the reduction fuse comprised in embodiment one, the three-phase type voltage transformer (VT) also comprising described fuse in this system and be connected with described fuse.
Because the device of the fusing number of times reducing fuse is described in detail in embodiment one, therefore, wouldn't repeat here.
The system of the fusing number of times of the reduction fuse that the present embodiment provides comprises the device of the fusing number of times reducing fuse, this device is by the neutral point access zero sequential potential transformer at voltage transformer (VT) primary side and the open-delta access harmonic elimination resistance at voltage transformer secondary side, effectively can overcome the fusing that the capacitor discharge dash current after singlephase earth fault recovery causes, therefore, the fusing number of times of fuse is reduced.In addition, this apparatus structure is simple, and advantage of lower cost, easily operates, and reliability is high, good stability.
Above the Apparatus and system of the fusing number of times of reduction fuse provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (7)
1. one kind reduces the device of the fusing number of times of fuse, be applied in the system of fuse and the three-phase type voltage transformer (VT) be connected with three-phase bus, it is characterized in that, the first side winding of described three-phase type voltage transformer (VT) is corresponding with described three-phase bus to be connected, the secondary side winding of described three-phase type voltage transformer (VT) is respectively star structure and open-delta structure, comprising:
The zero sequential potential transformer be connected with neutral point and the earth terminal of described three-phase type voltage transformer (VT) primary side;
The harmonic elimination resistance be connected with the described open-delta of described three-phase type voltage transformer secondary side.
2. the device of the fusing number of times of reduction fuse according to claim 1, is characterized in that, the line voltage of described three-phase type voltage transformer (VT) primary side is 10KV.
3. the device of the fusing number of times of reduction fuse according to claim 2, is characterized in that, the line voltage of described three-phase type voltage transformer secondary side is 100V.
4. the device of the fusing number of times of reduction fuse according to claim 1, is characterized in that, the resistance value of described harmonic elimination resistance is 200 ohm, and power is 200 watts.
5. the device of the fusing number of times of reduction fuse according to claim 1, is characterized in that, also comprises the support for fixing described zero sequential potential transformer.
6. the device of the fusing number of times of reduction fuse according to claim 1, is characterized in that, also comprises the watch-dog of the voltage of the secondary side for gathering described zero sequential potential transformer.
7. reduce a system for the fusing number of times of fuse, it is characterized in that, comprise the device of the fusing number of times of the reduction fuse described in claim 1 to 6 any one, the three-phase type voltage transformer (VT) also comprising described fuse and be connected with described fuse.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510543508.0A CN105182019A (en) | 2015-08-28 | 2015-08-28 | Device and system for reducing number of fusing times of fuse protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510543508.0A CN105182019A (en) | 2015-08-28 | 2015-08-28 | Device and system for reducing number of fusing times of fuse protector |
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| CN105182019A true CN105182019A (en) | 2015-12-23 |
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| CN201510543508.0A Pending CN105182019A (en) | 2015-08-28 | 2015-08-28 | Device and system for reducing number of fusing times of fuse protector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN112332391A (en) * | 2020-11-24 | 2021-02-05 | 国网北京市电力公司 | Harmonic elimination method, system and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN108767815B (en) * | 2018-07-17 | 2024-02-02 | 云南电网有限责任公司红河供电局 | Automatic bypass resonance elimination device of electromagnetic voltage transformer |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN110007261B (en) * | 2019-03-14 | 2024-03-19 | 国网新疆电力有限公司昌吉供电公司 | Device and method for judging fusing of primary side high-voltage fuse of voltage transformer |
| CN112332391A (en) * | 2020-11-24 | 2021-02-05 | 国网北京市电力公司 | Harmonic elimination method, system and device |
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