CN105186473A - Suppression device for direct-current magnetic bias current of high-voltage winding of transformer - Google Patents
Suppression device for direct-current magnetic bias current of high-voltage winding of transformer Download PDFInfo
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- CN105186473A CN105186473A CN201510287543.0A CN201510287543A CN105186473A CN 105186473 A CN105186473 A CN 105186473A CN 201510287543 A CN201510287543 A CN 201510287543A CN 105186473 A CN105186473 A CN 105186473A
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- 238000004804 winding Methods 0.000 title claims abstract description 9
- 230000001629 suppression Effects 0.000 title abstract description 4
- 230000007935 neutral effect Effects 0.000 claims abstract description 17
- 230000004224 protection Effects 0.000 claims abstract description 12
- 230000000452 restraining effect Effects 0.000 claims description 26
- 238000005259 measurement Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 9
- 230000001012 protector Effects 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The invention provides a suppression device for a direct current magnetic bias current of a high-voltage winding of a transformer, which comprises: the bypass protection device comprises a gap and a bypass switch, wherein the gap and the bypass switch are connected in parallel and then are connected in series to a neutral point of the transformer; measuring means for measuring the voltage across the bypass switch and the current through the bypass switch; a control device which compares the voltage and current measured by the measuring device with a preset operating voltage and operating current; when the current exceeds the action current, the bypass switch is switched off; when the voltage is lower than the action voltage, the bypass switch is closed. The suppression device can effectively suppress the influence of the direct current grounding electrode grounding current on the transformer with the neutral point of the transformer substation directly grounded, and has the advantages of simple structure, small volume, convenient installation, less capital investment, no change of the grounding mode of the transformer during normal operation, no influence on line protection and the like.
Description
Technical field
The present invention relates to a kind of restraining device of the DC magnetic bias current for transformer high-voltage winding.
Background technology
In recent years, along with rapid economic development, energy demand increases fast, and remote, high-capacity direct current power transmission engineering develops rapidly.China's shortage of land resource, DC transmission engineering earth electrode and AC Substation are in a lot of local close proximity, and AC Substation transformer inevitably will be subject to the impact of direct current grounding pole earth current.When DC line one pole take the earth as loop operation, huge direct current is formed loop with the earth, flows through and can have an impact to neighbouring AC system from the earth.One pole or bipolar take the earth as loop when running, potential difference can be formed between AC Substation, direct current will flow through Transformer Winding by transformer neutral point and transmission line, make transformer occur bias phenomenon.The zone of saturation that in AC network, neutral-point solid ground transformer is operated in excitation curve can cause that its vibration is violent, noise poly-ly rises, overheated and ac grid voltage resultant distortion rate significantly raises, and can cause the damage of transformer time serious.
The impact of DC magnetic bias current on transformer comprises: 1, noise increases; 2, on the impact of voltage waveform; Transformer copper loss increases; Transformers Iron Loss increases.
Direct current grounding pole earth current has following features to substation transformer impact: the time uncertain (fault or occur between turn(a)round), action time short (several hours), earth current amplitude large (upper kiloampere), positive-negative polarity is uncertain, affects large feature to transformer.At present, kiowatt has recognized the seriousness that direct current grounding pole earth current affects substation transformer at home.Present stage has the method and apparatus of multiple suppression transformer DC magnetic bias current, mainly contains electric capacity and seals in the method and apparatus such as small resistor, reverse dc, potential compensation every straight, neutral point.
Wherein, whether electric capacity is that isolated DC is relatively more thorough every straight device advantage, by switch control rule by electric capacity and spark gap bypass, also very convenient.Shortcoming is that package unit is comparatively complicated, takes up an area more, cost very high (up to 1,000,000 RMB), realizes difficulty still comparatively large, and for each side such as system overvoltage, insulation coordination to affect X factor more, check difficulty.In addition, seal in electric capacity and also likely cause system resonance.
Between neutral point and earth mat, seal in a resistance is the small resistor of several ohm, and the direct current that neutral point can be made to flow into obviously reduces, and reaches acceptable degree in engineering.Neutral point seals in impedance and creates impact to system zero order parameter, and then also can have influence on adjusting of relaying protection.The shortcoming of this scheme cannot offset direct current completely to flow into from neutral point, but due to its definite conception, be relatively easy to realize, also less on the impact of system.
Reverse dc and the complexity of the device involved by potential compensation method, be difficult to realize, present stage there is no application.
Summary of the invention
For the shortcoming of prior art, the object of this invention is to provide a kind of restraining device of the DC magnetic bias current for transformer high-voltage winding.
To achieve these goals, the invention provides a kind of restraining device of the DC magnetic bias current for transformer high-voltage winding, this restraining device comprises:
Bypass protector, it comprises gap, by-pass switch, is connected in series into transformer neutral point after gap and by-pass switch parallel connection; Gap is formed by two ball electrodes;
Measurement mechanism, for measuring the voltage at by-pass switch two ends and the electric current by by-pass switch;
Control device, the voltage and current measured by measurement mechanism and the operation voltage preset and operating current compare by it; When electric current exceedes operating current, then bypass switch opens; When voltage is lower than operation voltage, then closes bypass switch.
Restraining device of the present invention to be connected in series into transformer neutral point behind gap adjustable for spacing-controllable and by-pass switch parallel connection, reaches the object intercepting the backflow of the earth direct current.Control device, after monitoring transformer neutral point place DC magnetic bias current excessive (being greater than the operating current preset), by bypass switch opens, namely disconnects transformer neutral point grounded circuit, a gap is sealed in loop, cut off DC magnetic bias current.Now, as there is short trouble in circuit, gap both end voltage will sharply increase, thus puncture, fault current of releasing in time, avoids the overvoltage of the damage neutral point occurred thus and the destruction to relaying protection system.When two ends, gap direct voltage is less than the operation voltage preset, illustrate that now DC magnetic bias current is very little, does not affect the operation of transformer, now, by-pass switch closes, and gap is exited, the direct ground connection of transformer neutral point.
In the present invention, by-pass switch is by the electric current of tens amperes.
In the present invention, operating current, the operation voltage of by-pass switch can set according to demand, adjust.
In the present invention, action situation, the transformer operation conditions (ground connection, insulation) of transformer DC magnetic bias current size, restraining device can be sent to grid operating monitoring department in real time, and grid operating monitoring department can grasp Transformer Operation Status in real time.
With electric capacity compared with the straight device, restraining device of the present invention, owing to not having bulky capacitor, takes up an area less, and cost is very low, there is not the impact on each side such as system overvoltage, insulation coordination, relaying protections, also there is not the risk causing system resonance.
Compared with small resistor device, restraining device of the present invention can eliminate DC magnetic bias current completely, and meanwhile, control gap is the input coefficient when D.C. magnetic biasing is larger only, and transformer is direct ground connection under normal circumstances, on transformer operation manners without impact.
Compare with the device involved by potential compensation method with reverse dc; restraining device of the present invention has that structure is simple, volume is very little, easy for installation, fund input is less, does not change earthing mode when transformer normally runs, on route protection without advantages such as impacts, be beneficial in engineering and apply.
According to another embodiment of the present invention, gap is the adjustable gap of spacing-controllable, and the distance namely between the ball electrode of gap two can adjust as required, set.
According to another embodiment of the present invention, the excursion in gap is 1cm-10cm.
According to another embodiment of the present invention, control device regulates the size in gap.
According to another embodiment of the present invention, by-pass switch and control device are equipped with lightning protection device, damage under lightning overvoltage to prevent by-pass switch and control device.
According to another embodiment of the present invention, by-pass switch is vacuum or the closed structure of filling other inert gas, and during to avoid because of drop-out current, the electric spark between switch contacts causes and fires risk.
According to another embodiment of the present invention, the operate time of by-pass switch meets: t≤100ms.
According to another embodiment of the present invention, measurement mechanism comprises: for measuring the instrument of by-pass switch both end voltage (gap voltage); For measuring the instrument of loop current on by-pass switch loop.
According to another embodiment of the present invention, control device comprises logical circuit.
Compared with prior art, the present invention possesses following beneficial effect:
Restraining device of the present invention can effectively suppress direct current grounding pole earth current on the impact of the transformer of transformer station's neutral-point solid ground, its structure is simple, volume is little, easy for installation, fund input is less, do not change earthing mode when transformer normally runs, on route protection without impact etc.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the voltage transformer system of the restraining device of Application Example 1.
Embodiment
Embodiment 1
As shown in Figure 1, the voltage transformer system applying the restraining device of the present embodiment comprises transformer high-voltage winding 1 and the restraining device for DC magnetic bias current.Restraining device comprises bypass protector, measurement mechanism, control device.
Wherein, bypass protector comprises gap 2, by-pass switch T, is connected in series into transformer neutral point after gap 2 and by-pass switch T parallel connection; Gap 2 is formed by two ball electrodes, and its spacing is controllable, and the distance namely between the ball electrode of gap two can adjust as required, set.The excursion in gap 2 is 1cm-10cm.By-pass switch T is vacuum or the closed structure of filling other inert gas, and during to avoid because of drop-out current, the electric spark between switch contacts causes and fires risk, and its operate time meets: t≤100ms.
Measurement mechanism is for measuring the voltage at by-pass switch two ends and the electric current by by-pass switch; It comprises for measuring the instrument of by-pass switch both end voltage (gap voltage) and the instrument for measuring loop current on by-pass switch loop.
Control device comprises logical circuit, and the voltage and current measured by measurement mechanism and the operation voltage preset and operating current compare by it; When electric current exceedes operating current, then bypass switch opens; When voltage is lower than operation voltage, then closes bypass switch.Control device also regulates the size in gap in addition.
By-pass switch and control device are equipped with lightning protection device, damage under lightning overvoltage to prevent by-pass switch and control device.
The operation principle of the restraining device of the present embodiment is as follows:
When transformer receive direct current grounding pole earth current affect time, it is larger that electric current is flow through at by-pass switch T loop place, when electric current is greater than the operating current I of setting, control system sends command switch T and will disconnect in 100ms, transformer is by control gap ground connection, now, transformer does not affect by DC magnetic bias current.Now; as there is short trouble in circuit; gap both end voltage will sharply increase; thus puncture, fault current of releasing in time; effectively avoid the overvoltage of the damage neutral point occurred thus and the destruction to relaying protection system; therefore, this device does not affect transformer insulated coordinated scheme and circuit relay protection system.When by-pass switch T two ends (gap two ends of also can controlling ball) voltage is lower than the operation voltage U set, control system sends command switch T and will close in 100ms, the direct ground connection of transformer, recovers normal operating condition.
Although the present invention discloses as above with preferred embodiment, and is not used to limit scope of the invention process.Any those of ordinary skill in the art, not departing from invention scope of the present invention, when doing a little improvement, namely every equal improvement done according to the present invention, should be scope of the present invention and contained.
Claims (9)
1. for a restraining device for the DC magnetic bias current of transformer high-voltage winding, it is characterized in that, described restraining device comprises:
Bypass protector, it comprises gap, by-pass switch, is connected in series into transformer neutral point after described gap and described by-pass switch parallel connection; Described gap is formed by two ball electrodes;
Measurement mechanism, for measuring the voltage at described by-pass switch two ends and the electric current by described by-pass switch;
Control device, the voltage and current measured by described measurement mechanism and the operation voltage preset and operating current compare by it; When electric current exceedes operating current, then disconnect described by-pass switch; When voltage is lower than operation voltage, then closed described by-pass switch.
2. restraining device according to claim 1, is characterized in that, described gap is the adjustable gap of spacing-controllable.
3. restraining device according to claim 2, is characterized in that, the excursion in described gap is 1cm-10cm.
4. restraining device according to claim 2, is characterized in that, described control device regulates the size in described gap.
5. restraining device according to claim 1, is characterized in that, described by-pass switch and described control device are equipped with lightning protection device.
6. restraining device according to claim 1, is characterized in that, described by-pass switch is vacuum or the closed structure of filling other inert gas.
7. restraining device according to claim 1, is characterized in that, the operate time of described by-pass switch meets: t≤100ms.
8. restraining device according to claim 1, is characterized in that, described measurement mechanism comprises:
For measuring the instrument of described by-pass switch both end voltage;
For measuring the instrument of loop current on described by-pass switch loop.
9. restraining device according to claim 1, is characterized in that, described control device comprises logical circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510287543.0A CN105186473B (en) | 2015-05-29 | 2015-05-29 | Suppression device for direct-current magnetic bias current of high-voltage winding of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510287543.0A CN105186473B (en) | 2015-05-29 | 2015-05-29 | Suppression device for direct-current magnetic bias current of high-voltage winding of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105186473A true CN105186473A (en) | 2015-12-23 |
| CN105186473B CN105186473B (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510287543.0A Active CN105186473B (en) | 2015-05-29 | 2015-05-29 | Suppression device for direct-current magnetic bias current of high-voltage winding of transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107154619A (en) * | 2017-06-13 | 2017-09-12 | 浙江日新电气有限公司 | Automatic switchover earthing mode complexes and its automatic switchover earthing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130026691A (en) * | 2011-09-06 | 2013-03-14 | 한국전력공사 | Device and method for grounding the neutral |
| CN104158166A (en) * | 2014-08-01 | 2014-11-19 | 南方电网科学研究院有限责任公司 | Impedance-adjustable resistance-capacitance series-connection type transformer direct-current magnetic bias limiting device |
| CN104466907A (en) * | 2014-11-19 | 2015-03-25 | 广州高澜节能技术股份有限公司 | Transformer neutral point capacitance type DC blocking device |
| CN204290298U (en) * | 2015-01-06 | 2015-04-22 | 国家电网公司 | A kind of power transformer neutral point direct current current limliting and every stream device |
-
2015
- 2015-05-29 CN CN201510287543.0A patent/CN105186473B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130026691A (en) * | 2011-09-06 | 2013-03-14 | 한국전력공사 | Device and method for grounding the neutral |
| CN104158166A (en) * | 2014-08-01 | 2014-11-19 | 南方电网科学研究院有限责任公司 | Impedance-adjustable resistance-capacitance series-connection type transformer direct-current magnetic bias limiting device |
| CN104466907A (en) * | 2014-11-19 | 2015-03-25 | 广州高澜节能技术股份有限公司 | Transformer neutral point capacitance type DC blocking device |
| CN204290298U (en) * | 2015-01-06 | 2015-04-22 | 国家电网公司 | A kind of power transformer neutral point direct current current limliting and every stream device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107154619A (en) * | 2017-06-13 | 2017-09-12 | 浙江日新电气有限公司 | Automatic switchover earthing mode complexes and its automatic switchover earthing method |
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| CN105186473B (en) | 2018-03-16 |
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