CN205353172U - Manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means - Google Patents

Manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means Download PDF

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Publication number
CN205353172U
CN205353172U CN201521030906.4U CN201521030906U CN205353172U CN 205353172 U CN205353172 U CN 205353172U CN 201521030906 U CN201521030906 U CN 201521030906U CN 205353172 U CN205353172 U CN 205353172U
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CN
China
Prior art keywords
transformer
high voltage
electromagnetic type
voltage
tension electricity
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Expired - Fee Related
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CN201521030906.4U
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Chinese (zh)
Inventor
叶光平
苏炜
李怀迁
徐洪
谢谆
芮德荣
张明
吴卫华
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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Priority to CN201521030906.4U priority Critical patent/CN205353172U/en
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Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means, including house transformer and three -phase reducing transformer, three -phase reducing transformer is connected through the vacant switch of used change feed switch formula to the house transformer, and with the incoming wire terminal of three -phase reducing transformer secondary winding lug connection to PT cabinet high voltage potential transformer bang -bang control room, twice step -down of house transformer and three -phase reducing transformer is the same with high -tension electricity magnetic -type voltage transformer's once step -down scope. Utilize house transformer and voltage measurement transformer to replace electromagnetic type high voltage potential transformer, solved the ferroresonance overvoltage problem that exists during electromagnetic type high voltage potential transformer uses.

Description

The substituted device of factory's high-tension electricity electromagnetic type voltage transformer
Technical field
This utility model belongs to high-voltage electrical apparatus field of measuring technique, is specifically related to substituted device and the method for a kind of factory high-tension electricity electromagnetic type voltage transformer.
Background technology
Factory's high voltage supply generally adopts 3,6,10KV isolated neutral electric power system; namely level of factory electric substation provide 3 by Secondary Winding isolated neutral transformator to factory high-tension switch cabinet, 6,10KV high voltage power supply; and for isolated neutral system; being everlasting on bus and being connected to a winding is Y-connection; the electromagnetic type high voltage potential transformer (being often placed in high pressure P T cabinet) of its neutral ground, is mainly used in high voltage bus voltage measurement and relay protection (such as high voltage bus insulation, overvoltage, under-voltage, prepared auto restart condition etc.).But, the load of electromagnetic type high voltage potential transformer low-pressure side is only small, close to unloaded, high-pressure side has significantly high excitation impedance, when some grid switching operation (such as non-Switching Synchronization), or after earth fault disappears, form special three-phase or single-phase resonant tank between it and the stray capacitance of wire direct-to-ground capacitance or other equipment, and the ferro-resonance over-voltage of various harmonic wave can have been excited.Difference due to loop parameter and extraneous shooting condition, it is possible to cause frequency dividing, power frequency or high frequency ferro-resonance over-voltage.Although the form of overvoltage is diversified, the generation of overvoltage is all owing to property point occurs in that displacement voltage in the supply.In the electrical network of China 3~10KV; the ferro-resonance over-voltage caused because of electromagnetic type high voltage potential transformer is comparatively general; this fault is once occur; light then high voltage potential transformer protection fuse failure high voltage potential transformer burns, and the high pressure P T cabinet that heavy then high voltage potential transformer disposes causes generation high voltage short circuit to blow out.Ferro-resonance over-voltage problem existing in using for electromagnetic type high voltage potential transformer, so far both at home and abroad also without a simple effective and reliable solution (i.e. suppression measures).Equally, for horse steel, damaging even high voltage short circuit blows out Shuo Qi level of factory electric substation and factory's high pressure P T cabinet all to be occurred to occur because of ferro-resonance over-voltage every year, causes that factory powers and interrupts suddenly and cause long-time power failure, has a strong impact on the stable smooth operation of production.
It is difficult to avoid that in actual use in view of the fault that even high voltage short circuit blows out occurs damaging because of ferro-resonance over-voltage in factory's high-tension electricity electromagnetic type voltage transformer, to this, we have invented the alternative method of a kind of factory high-tension electricity electromagnetic type voltage transformer, adopt the method can realize, when not using factory's high-tension electricity electromagnetic type voltage transformer, the function that this transformer is main, so, problem existing during factory's high-tension electricity electromagnetic type voltage transformer uses is avoided up hill and dale.
Summary of the invention
According to above the deficiencies in the prior art, technical problem to be solved in the utility model is the substituted device proposing a kind of factory high-tension electricity electromagnetic type voltage transformer, utilize house transformer and voltage measurement transformator to replace electromagnetic type high voltage potential transformer, solve ferro-resonance over-voltage problem existing during electromagnetic type high voltage potential transformer uses.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is: the substituted device of a kind of factory high-tension electricity electromagnetic type voltage transformer, including house transformer and triphase step-down transformer, described house transformer connects triphase step-down transformer by the vacant switch of its feeding switch formula, triphase step-down transformer Secondary Winding is directly connected to the input terminal of PT cabinet high voltage potential transformer relay control room, house transformer and twice blood pressure lowering of triphase step-down transformer identical with high-tension electricity electromagnetic type voltage transformer blood pressure lowering scope.Described triphase step-down transformer has identical wiring group with PT cabinet high voltage potential transformer.Described house transformer is 10kV/380V step-down transformer, and described triphase step-down transformer is 380V/100V step-down transformer.
This utility model provides the benefit that: in June, 2015, and the alternative method of a kind of factory high-tension electricity electromagnetic type voltage transformer that we are designed is rolled in II section of 10KV high pressure P T cabinet of big H profile steel at Ma Gangsan steel and put into use, and practical effect is fine.This technological achievement can be promoted in factory's high tension distribution system in full company or even the whole nation, the use of this technological achievement is possible not only to cancel the electromagnetic type high voltage potential transformer in factory's high pressure P T cabinet, considerable spare part expense can be saved with this, but also avoid factory high pressure P T cabinet fault and cause whole factory electric power system fault.So, if this technological achievement can be promoted in full company, then can create the economic benefit of millions of unit.
Accompanying drawing explanation
Below the content expressed by this specification accompanying drawing and the labelling in figure are briefly described:
Fig. 1 (a) is that the TV of the isolated neutral system of detailed description of the invention of the present utility model is with the Yn three-phase circuit wiring diagram connected.
Fig. 1 (b) is the TV equivalent circuit diagram with the Yn three-phase circuit wiring diagram connected of isolated neutral system.
Fig. 2 is the electromagnetic type high voltage potential transformer wiring schematic diagram with its relay control room of detailed description of the invention of the present utility model.
Fig. 3 is the voltage measurement transformator wiring schematic diagram with electromagnetic type high voltage potential transformer relay control room of detailed description of the invention of the present utility model.
Detailed description of the invention
Below against accompanying drawing, by the description to embodiment, mutual alignment between the such as involved shape of each component of detailed description of the invention of the present utility model, structure, each several part and annexation, effect and operation principle, the manufacturing process of each several part and operate with method etc., it is described in further detail, to help those skilled in the art that inventive concept of the present utility model, technical scheme are had more complete, accurate and deep understanding.
The TV of isolated neutral system is with shown in Yn three-phase circuit wiring diagram below figure 1 (a) connected, in isolated neutral electric power system, being everlasting on bus and being connected to a winding is Y-connection, electromagnetic type high voltage potential transformer TV, Fig. 1 (b) of its neutral ground is its equivalent circuit diagram.In figureFor three-phase symmetrical power electromotive force, LA、LB、LCFor each phase magnetizing inductance of TV, C0Direct-to-ground capacitance for each phase conductor and bus etc..Make C0Admittance respectively Y after in parallel with each phase magnetizing inductanceA、YB、YC, when properly functioning, the magnetizing inductance of transformer TV is relatively big, X when iron core is unsaturatedL> XC.It is an equivalent capacitance, i.e. Y after both parallel connectionsA=YB=YC=j ω C, therefore overvoltage will not be produced.
When the interference that system jam or operation etc. are extraneous, as TV close a floodgate suddenly, circuit single-phase earthing etc., the winding of TV is saturated by exciting of excitation, again owing to degree saturated for three-phase windings L is different, therefore, YA≠YB≠YC.Therefore, necessarily causing neutral point displacement voltage, it can be power-frequency voltage, it is also possible to be frequency dividing or high frequency voltage.
By the saturated mechanism causing harmonic wave overvoltage (i.e. ferro-resonance over-voltage) of above-mentioned electromagnetic type high voltage potential transformer TV it can be seen that install electromagnetic type high voltage potential transformer PT cabinet be easy in practical work process occur occur damaging the fault that even high voltage short circuit is blown out because of ferro-resonance over-voltage.But, for the saturated problem causing ferro-resonance over-voltage of electromagnetic type high voltage potential transformer, so far both at home and abroad also without a simple effective and reliable solution (i.e. suppression measures).
From the structure (as Suo Shi figure 1 above (a)) of electromagnetic type high voltage potential transformer TV in conventional use of PT cabinet, electromagnetic type high voltage potential transformer is actually the three-winding transformer of a ribbon core, Circuit Fault on Secondary Transformer has two three-phase windings, one is used for the three-phase windings of bus voltage measurement (being called for short voltage measurement winding) for Y-connection, due to the essentially no variation of connect load of this winding, so, there is higher voltage measurement accuracy;Another connects the three-phase windings for bus insulation monitoring (being called for short insulating monitoring winding) for triangle and is open-circuit condition, form the three-phase windings that a triangle having opening connects, when system three-phase is normal, three-phase voltage vector sum is zero, and open side output voltage is 0;When certain phase ground connection, three-phase voltage disequilibrium, in triangle open mouth side, residual voltage occurs.Open delta output termination voltage relay or other testing circuit, thus send system earth signal.In short, the major function of the electromagnetic type high voltage potential transformer of routine is exactly voltage measurement and the insulating monitoring of power supply buses.And for the insulating monitoring winding of factory's electromagnetic type high voltage potential transformer, when there is earth fault in factory section high voltage supply bus, the voltage of this section of bus-bar potential transformer insulating monitoring winding open delta outfan will be not zero, thus make this section of busbar grounding detection voltage relay action, and on factory's high voltage supply state display, send this section of high voltage supply busbar grounding fault alarm.When earth fault occurring in view of high voltage supply circuit, even if factory's high pressure P T cabinet sends high voltage bus earth fault and reports to the police, due to the seriality produced, it is impossible to for the inspection of high voltage bus earth fault, factory's high voltage supply circuit is carried out power failure operation at short notice.But, when factory's correspondent section high voltage supply circuit not power-off, factory plant maintenance personnel cannot determine whether high voltage bus earth point is on the high voltage supply circuit in this factory;Additionally, the earth fault of factory's high voltage supply circuit be generally all moment occur and the persistent period very short, and when earth fault occurs in high voltage supply circuit, upper level electric substation and the high pressure P T cabinet of each factory on same high voltage supply circuit all can send high voltage bus earth fault and report to the police.It follows that the insulation-monitoring function of factory's electromagnetic type high voltage potential transformer is without practical significance, the insulating monitoring of high voltage supply bus can be completed by the PT cabinet of the upper level electric substation on factory's high voltage supply circuit completely;And for the voltage measurement winding of factory's electromagnetic type high voltage potential transformer; generally the three-phase output of this winding is connected to voltmeter (indicating for busbar voltage), bus overvoltage and low-voltage protection unit (for relay protection), kilowatt-hour meter (wattful power messurement for nonquantitative) and high voltage supply loop reactive compensation control system (detecting for busbar voltage), and these equipment or device that transformer voltage measurement winding connects are not required for high-precision bus voltage measurement.Accordingly, only from the angle of factory's high voltage bus voltage measurement, in view of the provisioned house transformer (being called for short used change) on factory every section high voltage bus is generally of stable load, so, the change used (10KV/380V) of factory every section high voltage bus and the triphase step-down transformer of a low capacity can be utilized completely to substitute the electromagnetic type high voltage potential transformer installed in this section of high voltage bus PT cabinet.
For factory's high pressure P T cabinet, voltage measurement winding outfan and the bus insulation monitoring winding outfan of its electromagnetic type high voltage potential transformer usual are connected to high voltage potential transformer relay control room by controlling cable, thus realizing the measurement of bus three-phase voltage, relay control and bus insulation monitoring etc., the wiring schematic diagram of electromagnetic type high voltage potential transformer and its relay control room is illustrated in fig. 2 shown below.As it has been described above, when being left out factory high pressure P T cabinet bus insulation monitoring function, it is possible to join house transformer by factory's height and a measuring transformer substitutes electromagnetic type high voltage potential transformer in factory's high pressure P T cabinet.For this, triphase step-down transformer (the 3KVA of a low capacity is connected under a certain vacant switch of factory's house transformer feeding switch room, 380V/100V) (it is called for short voltage measurement transformator), this voltage measurement transformator and electromagnetic type high voltage potential transformer have identical wiring group (i.e. y/y-0), then, this three-phase voltage measuring transformer Secondary Winding is directly connected on the input terminal of PT cabinet high voltage potential transformer relay control room, directly replace former electromagnetic type high voltage potential transformer three-phase voltage and measure the connecting line of winding outfan, the wiring schematic diagram of voltage measurement transformator and electromagnetic type high voltage potential transformer relay control room is illustrated in fig. 3 shown below.
Above in conjunction with accompanying drawing, this utility model is exemplarily described; obvious this utility model implements and is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model design carries out with technical scheme; or not improved design of the present utility model and technical scheme are directly applied to other occasion, all within protection domain of the present utility model.Protection domain of the present utility model should be as the criterion with claims protection defined.

Claims (4)

1. the substituted device of factory's high-tension electricity electromagnetic type voltage transformer, it is characterized in that, this device includes house transformer, feeding switch and triphase step-down transformer, described house transformer connects triphase step-down transformer by the vacant feeding switch of its feeding switch room, triphase step-down transformer Secondary Winding is directly connected to the input terminal of PT cabinet high voltage potential transformer relay control room, the house transformer of every section of high voltage bus, feeding switch triphase step-down transformer one_to_one corresponding.
2. the substituted device of factory according to claim 1 high-tension electricity electromagnetic type voltage transformer, it is characterised in that house transformer is identical with high-tension electricity electromagnetic type voltage transformer blood pressure lowering scope with twice blood pressure lowering of triphase step-down transformer.
3. the substituted device of factory according to claim 1 high-tension electricity electromagnetic type voltage transformer, it is characterised in that described triphase step-down transformer has identical wiring group with PT cabinet inner high voltage voltage transformer.
4. the substituted device of factory according to claim 1 high-tension electricity electromagnetic type voltage transformer, it is characterised in that described house transformer is 10kV/380V step-down transformer, and described triphase step-down transformer is 380V/100V step-down transformer.
CN201521030906.4U 2015-12-09 2015-12-09 Manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means Expired - Fee Related CN205353172U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201521030906.4U CN205353172U (en) 2015-12-09 2015-12-09 Manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201521030906.4U CN205353172U (en) 2015-12-09 2015-12-09 Manufacturing plant high -tension electricity magnetic -type voltage transformer's substitute means

Publications (1)

Publication Number Publication Date
CN205353172U true CN205353172U (en) 2016-06-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105425005A (en) * 2015-12-09 2016-03-23 马鞍山钢铁股份有限公司 Substitution device of manufacturing-plant high-voltage electromagnetic voltage transformer and method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105425005A (en) * 2015-12-09 2016-03-23 马鞍山钢铁股份有限公司 Substitution device of manufacturing-plant high-voltage electromagnetic voltage transformer and method thereof
CN105425005B (en) * 2015-12-09 2018-03-30 马鞍山钢铁股份有限公司 The replacement device and method of factory's high-tension electricity electromagnetic type voltage transformer

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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province

Patentee after: Ma'anshan Iron and Steel Co., Ltd.

Address before: 243003 Hunan Anhui West Road, No. 8 technology center, Intellectual Property Department

Patentee before: Ma'anshan Iron and Steel Co., Ltd.

CP02 Change in the address of a patent holder
CP02 Change in the address of a patent holder

Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui

Patentee after: Ma'anshan Iron and Steel Co., Ltd.

Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui

Patentee before: Ma'anshan Iron and Steel Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160629

Termination date: 20201209