CN202586318U - Abrupt change overvoltage inhibition device for electronic voltage transformer - Google Patents

Abrupt change overvoltage inhibition device for electronic voltage transformer Download PDF

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Publication number
CN202586318U
CN202586318U CN 201220092746 CN201220092746U CN202586318U CN 202586318 U CN202586318 U CN 202586318U CN 201220092746 CN201220092746 CN 201220092746 CN 201220092746 U CN201220092746 U CN 201220092746U CN 202586318 U CN202586318 U CN 202586318U
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CN
China
Prior art keywords
inductance
voltage transformer
sudden change
pressure limiting
electronic type
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
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CN 201220092746
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Chinese (zh)
Inventor
罗明览
林传伟
周健
林崇
汤惠芳
陈思华
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FUJIAN YONG FU PROJECT CONSULTANT Co Ltd
Fujian Electric Power Survey and Design Institute
Original Assignee
FUJIAN YONG FU PROJECT CONSULTANT Co Ltd
Fujian Electric Power Survey and Design Institute
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Application filed by FUJIAN YONG FU PROJECT CONSULTANT Co Ltd, Fujian Electric Power Survey and Design Institute filed Critical FUJIAN YONG FU PROJECT CONSULTANT Co Ltd
Priority to CN 201220092746 priority Critical patent/CN202586318U/en
Application granted granted Critical
Publication of CN202586318U publication Critical patent/CN202586318U/en
Anticipated expiration legal-status Critical
Withdrawn - After Issue legal-status Critical Current

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Abstract

The utility model relates to an electronic voltage transformer, and especially relates to an abrupt change overvoltage inhibition device for an electronic voltage transformer. The device comprises a terminal n1 and a terminal a of a voltage-dividing capacitor C0 of the transformer. The terminal n1 is a grounding terminal and is connected with a first grounding system D1. A ground wire equivalent inductor of the first grounding system D1 is Ld1. The device is characterized by further comprising an inductor Lg1 and an inductor Lg2 which are respectively connection with the terminal a and the terminal n1 in series; an output terminal of the inductor Lg1 is a terminal b, and an output terminal of the inductor Lg2 is a terminal n2; the terminal n2 is connected with a second grounding system D2, and a ground wire equivalent inductor of the second grounding system D2 is Ld2; and the device also comprises a voltage limiting element XYJ, and two ends of the XYJ are respectively connected with the terminal b and the terminal n2. The advantages are that the device of the utility model helps to fundamentally solve problems that the electronic voltage transformer is liable to be damaged by abrupt change overvoltage when the voltage transformer is used on a high-voltage or an ultrahigh-voltage line, enables the transformer to be measured on the high-voltage line in a safe, reliable and highly precise manner, and enables superiority for use of the transformer to be guaranteed.

Description

Electronic type voltage transformer sudden change overvoltage presses down the resistance device
Technical field
The utility model relates to a kind of electronic type voltage transformer, and particularly a kind of electronic type voltage transformer sudden change overvoltage presses down the resistance device.
Background technology
When power plant and electric substation also are in the application simulation amount as the input variable of protection, measurement, signal; Required voltage is to adopt electromagnetic potential transformer, capacitance type potential transformer to obtain, and when requiring input voltage to be digital quantity, then obtains through mould/number conversion.Electromagnetic potential transformer is that the employing transformer principle is that low-voltage (0.1kV) supplies protection, measurement, signal with high-voltage variable.Get in touch through magnetic circuit between its high pressure winding and low pressure winding, do not have contacting directly of electricity, the damage of the overvoltage of burst to the insulation of low pressure secondary circuit can be effectively isolated in the insulation between first and second winding.The intermediate transformer that is connected to capacitance type potential transformer dividing potential drop electric capacity two ends also has same function, and its dielectric strength of first and second is lower than electromagnetic potential transformer.
In recent years; Power plant, electric substation promote intellectuality, digitlization gradually; The corresponding electronic type voltage transformer of releasing on voltage is measured, it can directly export digital quantity, and the electromagnetic potential transformer of above-mentioned relatively output analog quantity or the primary circuit of capacitance type potential transformer are simple in structure, reliable; Cost is lower, good economy performance.But what its secondary circuit was used is the circuit board that electronic loop is formed, and the poor performance of tolerance mutability overvoltage (switching overvoltage, lightning overvoltage) causes circuit board component to puncture easily.In China the accident of a lot of circuit board damage took place once, the reason that causes accident is that because capacitance voltage can not suddenly change, the overvoltage of this burst can only be born by the inductance element in loop when the burst overvoltage took place, and the distribution that is directly proportional by the size of loop inductance.When the inductance of instrument transformer down conductor was big, earth terminal was just bigger to the voltage difference of zero potential, and when greater than the insulation withstand voltage of electronic circuit board, circuit board just can damage, concrete analysis as follows:
With reference to shown in the accompanying drawing 1 The electric key wiring diagram of circuit breaker, G among the figure MThe expression bus isolating switch, CB representes circuit breaker, G SExpression is into and out of the line isolating switch, and ECVT representes electronic type voltage transformer, C GDistributed capacitance when the expression isolating switch breaks off between dynamic and static contact, C CBDistributed capacitance when the expression circuit breaker breaks off between dynamic and static contact, C T0Bonding conductor electric capacity over the ground between indication equipment, C ΣExpression system direct-to-ground capacitance, the part that other do not do to mark among the figure is same as described above.
The burst overvoltage that produces for ease of analysis operation equipment is to the influence of electronic type voltage transformer, can with accompanying drawing 1 abbreviation become shown in accompanying drawing 2 at operation (closing) G (G MOr G S) or the equivalent electric circuit winding diagram during CB (but be similar equivalent electric circuit for winding diagrams such as single busbar connection, double-bus also abbreviation).Wherein, u is the electric power system supply voltage, and Ld is the inductance of electronic type voltage transformer down conductor, and Ls is the total inductance on the equivalent circuit except that Ld, C DFor all the other equipment of not comprising operated equipment (like operation G MThe time, CB and G SBe all the other equipment) Equivalent Distributed electric capacity, C is the main capacitance of electronic type voltage transformer, C 0Be the dividing potential drop electric capacity of electronic type voltage transformer, the meaning of all the other symbolic representations is with shown in the accompanying drawing 1.
During operation, C ΣLast voltage u is by the frequency alternate of electric power system, works as C ΣWhen higher voltage is arranged, C G(or C CB) on voltage U GC(U CBC) also higher, when closing G or CB, U GC(U CBC) will be by short circuit, because C Σ>>C//C 0≈ C (the C of ECVT 0>>C), visual C ΣVoltage is constant, by the voltage U of short circuit GC(U CBC) will change and be added to Ls, Ld, ignore the influence of loop resistance, the voltage that is added on the Ld is:
L=Ls+Ld in the following formula; ; Ud=
Be C D, C, C 0Deng the synthetic electric capacity of the series connection of electric capacity.
Insert the ECVT of three-phase circuit, add to the u of circuit board dTo three-phase ECVT on the same group is inequality, as this phase power supply u dWhen being in higher instantaneous voltage, corresponding C G(C CB) on voltage U GC(U CBC) also higher, it is also bigger to close the Ud that corresponding G (CB) produced, so be not that each operation circuit board all can take place is damaged, the phenomenon that A, B, C three-phase circuit plate damage simultaneously also can not occur.To the influence of system operation overvoltage, lightning overvoltage, also can use above-mentioned analytical method to ECVT.
Only can know from above analysis; Reduce the influence of Ud to circuit board, add isolating transformer if adopt, the promptly former voltage that directly adds to circuit board adds to circuit board after isolating transformer is isolated; Insulation level between first and second winding of this isolating transformer can only with the corresponding raising of its volume size; Therefore its dielectric strength is limited within the specific limits, adds that isolating transformer also can influence the certainty of measurement of ECVT afterwards, compares with capacitance type potential transformer; Just there has not been obvious superiority; Moreover can only prevent the sudden change overvoltage that general operation causes, for the overvoltage that the operation nonloaded line causes, the overvoltage that lightning overvoltage etc. are more serious just has limitation.To consider the power distribution equipment pattern in addition not simultaneously; The sudden change overvoltage that a variety of causes produces is also different; Fully closed combined electric unit power distribution equipment sudden change overvoltage value for all being cable turnover line is the highest; Next is the HGIS power distribution equipment, and air-insulated power distribution equipment (AIS) the sudden change overvoltage value that the turnover line is overhead wire is minimum.
Available technology adopting reduce as far as possible down conductor length, increase earth connection parallel connection radical, use good conductors such as non magnetic copper, suitably strengthen the methods such as sectional area of earth connection; Can reduce the inductance L d value and the corresponding Ud value of earth connection significantly, but still can not be reliably, effectively with the voltage U d restriction (perhaps dropping to) of sudden change numerical value to the ECVT safe enough.
The utility model content
The purpose of the utility model is to provide a kind of overvoltage that reliably, effectively prevents to suddenly change that ECVT is caused damage, guarantees certainty of measurement and uses the electronic type voltage transformer sudden change overvoltage of superiority to press down the resistance device according to the weak point of prior art
The described electronic type voltage transformer sudden change of the utility model overvoltage presses down the resistance device and realizes through following approach:
Electronic type voltage transformer sudden change overvoltage presses down the resistance device, includes instrument transformer dividing potential drop capacitor C 0Two terminals n1 end and a end, the n1 end is ground connection one end, this end connects the first grounding system D1; Its earth connection equivalent inductance is Ld1, and its structural feature is, also includes two inductance L g1 and inductance L g2 that are connected on a end and n1 end respectively; Output with inductance L g1 is the b end, and the output of inductance L g2 is the n2 end, and the n2 end connects the second grounding system D2; Its earth connection equivalent inductance is Ld2, also includes pressure limiting element XYJ, and its two ends are connected with the n2 end with the b end respectively.
The principle that presses down the resistance device is: the dividing potential drop capacitor C when normally moving 0The voltage effective value is only about 1.5V, when the sudden change overvoltage occurring, because of C 0Voltage can not suddenly change, C 0Two ends n1 end and a end mutation voltage over the ground all can be considered Ud1, are serially connected in C this moment 0Inductance L g1 on the lead-out wire and inductance L g2 can intercept the high-frequency harmonic electric current of sudden change effectively; Born most of voltage of mutation voltage Ud1; And the equivalent inductance Ld2 of second grounding system only bears the very mutation voltage of fraction; When more serious overvoltage such as overvoltage that the operation nonloaded line causes or lightning overvoltage occurring; As long as the ratio of inductance L g1 (Lg2)/Ld1 (Ld2) meets the demands, just can guarantee that under the various over-voltage condition, the circuit board of ECVT can not receive high-tension impact and damage.Pressure limiting element XYJ plays the pressure limiting effect to circuit board at this, and the impact of overvoltage to circuit board prevents to suddenly change.Thereby realize safe on high-tension line, reliable, the high-precision measurement of ECVT, realize the use superiority of ECVT.
The utility model can further be specially:
The circuit board that electronic type voltage transformer sudden change overvoltage presses down resistance device and instrument transformer is installed in same casing; But two inductance L g1 in the resistance device and Lg2 coil be mutual vertical distribution in the space; The two is installed on the shell of casing, and perpendicular to this shell surface, simultaneously; Coil is exposed at the corresponding air insulation distance of maximum Ud1 that the length S on the cabinet shell possibly occur greater than institute's connection line outward, and Ud1 is the sudden change overvoltage that is added on the first grounding system equivalent inductance Ld1.
But the air insulation distance reference standard (as being not more than 7kV/cm) that maximum Ud1 is corresponding calculates, for example, just the corresponding air insulation distance of 70,000 volts mutation voltage is more than the 10cm; The just corresponding height of inductance coil on shell is greater than 10cm; Thereby need the overwhelming majority with inductance coil Lg1 and inductance L g2, or all outer being exposed at outside the casing, and install perpendicular to cabinet shell; At first be to avoid the input of inductance coil that cabinet shell is discharged; Thereby influence the operate as normal of electronic component in the casing, secondly, also avoided electricity that the high-frequency harmonic electric current produces, magnetic interference electronic component in the casing in inductance coil.
The utility model can also further be specially:
Pressure limiting element XYJ comprises two parallelly connected pressure limiting loops, and two pressure limiting loops form by diode and voltage-stabiliser tube serial connection, and the diode in the two pressure limiting loops of parallel connection is opposite with voltage-stabiliser tube polarity.
Like this, in AC measurment, can prevent that circuit board from suffering superpotential impact for circuit board provides the voltage that is no more than 3 * 1.5V.
Can also be:
Pressure limiting element XYJ includes two pressure limiting loops of parallel connection, and every pressure limiting loop all has a plurality of diode sequences and composes in series, but the pipe polarity in two pressure limiting loops is opposite.
The utility model can also further be specially:
The inductance value of inductance L g1 and inductance L g2 equates.
Can guarantee to press down the resistance device so can not exert an influence to the use of electronic type voltage transformer.
The said electronic type voltage transformer sudden change of the utility model overvoltage presses down the application of resistance device, comprises the steps:
Provide a kind of aforesaid electronic type voltage transformer sudden change overvoltage to press down the resistance device, the circuit board of itself and instrument transformer is installed in same casing;
During installation, cabinet shell and the aerial insulation distance of electronic type voltage transformer body housing are with inductance L g1/Lg2 input and press down the air distance between the resistance crust of the device, and just coil is exposed at the length S on the cabinet shell outward;
Casing adopts to have with the post insulator of the corresponding insulation level of Ud1 and supports to install on the ground;
By pressing down earth connection that resistance device n2 end draws is the insulated wire that has with post insulator same dielectric level, and the earth connection radical is greater than 2, and parallel connection is switched to the second grounding system D2;
The initial segment line length of being drawn by circuit board is consistent with the Ld2 earth connection length of being drawn by n2, and insulation level is also consistent with the Ld2 earth connection;
By pressing down earth connection that resistance device n1 end draws for greater than 2 copper stranded conductor, and parallel connection is switched to the first grounding system D1;
First grounding system D1 that is connected and the distance of the second grounding system D2 in ground are greater than 10m; Inductance L g1/Lg2 is greater than the Ld1/ Ld2 more than 20 times;
Electronic type voltage transformer is received in the power network line to be measured, closed isolating switch or circuit breaker, measure.
The initial segment circuit that said circuit board is drawn is meant: the junior one section circuit of being drawn by the casing that install to press down resistance device and circuit board.
Being installed in the same casing pressing down the circuit board that hinders device and electronic type voltage transformer, is that this is constructed as a kind of electronic circuit because press down the resistance device, and pressure limiting element wherein is made up of diode or voltage-stabiliser tube especially; Be installed together with the circuit board of instrument transformer; At first be can simplified structure, press down the resistance device and need not to adopt casing to pack in addition, and need not consider to press down the peripheral connection line problem between resistance device and the transformer circuit plate; In addition; Also brought unexpected technique effect, promptly pressed down the resistance device and will be connected to respectively among the second grounding system D2, be installed in that pressing down in the same casing hindered device and circuit board can be drawn earth connection on the tie point of direct-on-line road with circuit board; And need not separately to draw earth connection; And the wiring of separately drawing earth connection is more complicated, and will consider the problem that the leading point current potential is consistent, and is more simple, convenient on feasible the application.
Described tap is meant the copper stranded conductor greater than 2 is connected two different access points in the same grounding system.About the ratio of Lg (Lg1/Lg2) and Ld (Ld1/ Ld2) with reference to following key element: with to the overvoltage Limiting of circuit board at desired safety value; For different electric pressures, different power distribution equipment pattern; Lg is different with the ratio (multiple) of Ld; Electric pressure is high more, and the multiple of requirement is also just big more, and the Lg/Ld value of GIS power distribution equipment is bigger than other power distribution equipment patterns (like HGIS, AIS).During normal the operation, C 0The voltage U at two ends C0The voltage drop Ud1 of the Ld1 earth connection of drawing greater than the n1 end greatly, i.e. U C0>>Ud1 reasonably strengthens the multiple of Lg/Ld, owing to can reduce power supply U after sealing in Lg1, Lg2 C0Equivalent internal resistance anti-, help improving the certainty of measurement of ECVT, thereby realize safe on high-tension line, reliable, the high-precision measurement of electronic type voltage transformer, guarantee the use superiority of electronic type voltage transformer.
In sum; The utility model provides a kind of electronic type voltage transformer sudden change overvoltage to press down the resistance device; Pressing down the resistance device is made up of restriction superpotential two inductance of high frequency and pressure limiting element; Simultaneously, should press down the resistance device and need connect two grounding systems, and require the equivalent inductance value of grounding system more little good more.Like this; Suppressed the high frequency overvoltage from circuit before this; Next adopts the pressure limiting element that circuit board is carried out voltage-limiting protection; At last through reducing the influence of overvoltage that reduce to suddenly change of ground connection inductance to electronic type voltage transformer; Fundamentally solve the problem that runs into the sudden change overvoltage when electronic type voltage transformer uses and damage on the circuit of high pressure, superhigh pressure, thereby realized safe on high-tension line, reliable, the high-precision measurement of electronic type voltage transformer, guaranteed the use superiority of electronic type voltage transformer.
Description of drawings
Shown in Figure 1 is the electric key wiring diagram of circuit breaker described in the utility model background technology.
Shown in Figure 2 for operating (closing) G (G described in the utility model background technology MOr G S) or the equivalent electric circuit winding diagram during CB.
Shown in Figure 3 is the schematic equivalent circuit that the said electronic type voltage transformer sudden change of the utility model overvoltage presses down the resistance device.
Below in conjunction with embodiment the utility model is done and to be further described.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 3; Electronic type voltage transformer sudden change overvoltage presses down the resistance device, includes instrument transformer dividing potential drop capacitor C 0Two terminals n1 end and a end, the n1 end is terminals, and this end connects the first grounding system D1, and its earth connection equivalent inductance is Ld1.Also include two inductance L g1 and inductance L g2 that are connected on a end and n1 end respectively, the inductance value of inductance L g1 and inductance L g2 equates.Output with inductance L g1 is the b end, and the output of inductance L g2 is the n2 end, and the n2 end connects the second grounding system D2, and its earth connection equivalent inductance is Ld2, also includes pressure limiting element XYJ, and its two ends are connected with the n2 end with the b end respectively.
Pressure limiting element XYJ includes two pressure limiting loops of parallel connection, and every pressure limiting loop all has a plurality of diodes (perhaps by diode and voltage-stabiliser tube series connection) and composes in series in proper order, but the pipe polarity in two pressure limiting loops is opposite.
The circuit board that electronic type voltage transformer sudden change overvoltage presses down resistance device and instrument transformer is installed on the same casing; But two inductance L g1 in the resistance device and Lg2 coil be mutual vertical distribution in the space; The two is installed on the shell of casing; And perpendicular to this shell surface, simultaneously, coil is exposed at the corresponding air insulation distance of maximum Ud1 that the length S on the cabinet shell possibly occur greater than institute's connection line outward.
The application process that electronic type voltage transformer sudden change overvoltage presses down the resistance device comprises the steps:
Provide a kind of aforesaid electronic type voltage transformer sudden change overvoltage to press down the resistance device, the circuit board of itself and instrument transformer is installed on the same casing,
During installation, cabinet shell and the aerial insulation distance of electronic type voltage transformer body housing are with inductance L g1/Lg2 input and press down the air distance between the resistance crust of the device, and just coil is exposed at the length S on the cabinet shell outward,
Casing adopts to have with the post insulator of the corresponding insulation level of Ud1 and supports with installation on the ground,
By pressing down earth connection that resistance device n2 end draws is the insulated wire that has with post insulator same dielectric level, and the earth connection radical is greater than 2, and parallel connection is switched to the second grounding system D2;
The initial segment line length of being drawn by circuit board is consistent with the Ld2 earth connection length of being drawn by n2, and insulation level is also consistent with the Ld2 earth connection;
By pressing down earth connection that resistance device n1 end draws for greater than 2 copper stranded conductor, and parallel connection is switched to the first grounding system D1;
First grounding system D1 that is connected and the distance of the second grounding system D2 in ground are greater than 10m; Inductance L g1/Lg2 is greater than the Ld1/ Ld2 more than 20 times;
Electronic type voltage transformer is received in the power network line to be measured, closed isolating switch or circuit breaker, measure.
The distance of the first above-mentioned grounding system D1 and earth connection access point in ground of the second grounding system D2 is 10m-12m; The earth connection that connects the D1 grounding system adopts bare copper stranded wire; The earth connection that connects the D2 grounding system adopts the insulated copper twisted wire, and cross-sectional area is greater than 50 square millimeters; The earth connection radical is tapped into the D1/D2 grounding system greater than 2, to reduce the ground connection inductance, reduces mutation voltage over the ground.The insulation level that connects the insulated copper twisted wire of D2 grounding system should match with the Ud1 voltage under the serious overvoltage (being complementary in other words).
Secondly Lg1 and Lg2 inductance value equate, the loop length s of two inductance is greater than the corresponding air insulation distance of sudden change overvoltage Ud1, and the spatially mutual vertical distribution of two coils, prevents that two inductance magnetic fluxs are mutual.Press down resistance device and ECVT circuit board and be installed in same casing, the air insulation distance on cabinet shell and ECVT body housing, cabinet shell and its installation ground and the insulation level of circuit board lead line all should be complementary with Ud1.
It is identical with prior art that the utility model is not stated part.

Claims (5)

1. electronic type voltage transformer sudden change overvoltage presses down the resistance device, and electronic type voltage transformer sudden change overvoltage presses down the resistance device, includes instrument transformer dividing potential drop capacitor C 0Two terminals n1 end and a end, the n1 end is ground connection one end, this end connects the first grounding system D1; Its earth connection equivalent inductance is Ld1, it is characterized in that, also includes two inductance L g1 and inductance L g2 that are connected on a end and n1 end respectively; Output with inductance L g1 is the b end, and the output of inductance L g2 is the n2 end, and the n2 end connects the second grounding system D2; Its earth connection equivalent inductance is Ld2, also includes pressure limiting element XYJ, and its two ends are connected with the n2 end with the b end respectively.
2. electronic type voltage transformer sudden change overvoltage according to claim 1 presses down the resistance device; It is characterized in that; The circuit board that electronic type voltage transformer sudden change overvoltage presses down resistance device and instrument transformer is installed in same casing, press down the two inductance L g1 that hinder in the device and Lg2 coil in the space mutual vertical distribution, the two is installed on the shell of casing; And perpendicular to this shell surface; Simultaneously, coil is exposed at the corresponding air insulation distance of maximum Ud1 that the length S on the cabinet shell possibly occur greater than institute's connection line outward, and Ud1 is the sudden change overvoltage that is added on the first grounding system equivalent inductance Ld1.
3. electronic type voltage transformer sudden change overvoltage according to claim 1 presses down the resistance device; It is characterized in that; Pressure limiting element XYJ comprises two parallelly connected pressure limiting loops, and two pressure limiting loops form by diode and voltage-stabiliser tube serial connection, and the diode in the two pressure limiting loops of parallel connection is opposite with voltage-stabiliser tube polarity.
4. electronic type voltage transformer sudden change overvoltage according to claim 1 presses down the resistance device; It is characterized in that; Pressure limiting element XYJ includes two pressure limiting loops of parallel connection, and every pressure limiting loop all has a plurality of diode sequences and composes in series, but the pipe polarity in two pressure limiting loops is opposite.
5. electronic type voltage transformer sudden change overvoltage according to claim 1 presses down the resistance device, it is characterized in that the inductance value of inductance L g1 and Lg2 equates.
CN 201220092746 2012-03-13 2012-03-13 Abrupt change overvoltage inhibition device for electronic voltage transformer Withdrawn - After Issue CN202586318U (en)

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Application Number Priority Date Filing Date Title
CN 201220092746 CN202586318U (en) 2012-03-13 2012-03-13 Abrupt change overvoltage inhibition device for electronic voltage transformer

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Application Number Priority Date Filing Date Title
CN 201220092746 CN202586318U (en) 2012-03-13 2012-03-13 Abrupt change overvoltage inhibition device for electronic voltage transformer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611092A (en) * 2012-03-13 2012-07-25 福建省电力勘测设计院 Mutation overvoltage impedance suppression device for electronic voltage transformer and application of device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611092A (en) * 2012-03-13 2012-07-25 福建省电力勘测设计院 Mutation overvoltage impedance suppression device for electronic voltage transformer and application of device
CN102611092B (en) * 2012-03-13 2014-06-04 福建省电力勘测设计院 Mutation overvoltage impedance suppression device for electronic voltage transformer and application of device

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