CN202383182U - High-voltage capacitive divider for optical voltage transformer - Google Patents

Abstract

The utility model discloses a high-voltage capacitive divider for an optical voltage transformer, which belongs to the field of manufacture of a power capacitor and particularly relates to the high-voltage capacitive divider for the optical voltage transformer. In order to solve the problems of the conventional high-voltage capacitive divider, such as poor temperature stability, instable voltage division and poor anti-jamming ability, the high-voltage capacitive divider provided by the utility model comprises a high-voltage terminal, an upper cover, two metal expanders, an upper node coupling capacitor, a lower node coupling capacitor, an upper node insulating sleeve, a lower node insulating sleeve, an insulating umbrella skirt, a grounding terminal, a bottom cover and a base, wherein the upper node coupling capacitor and the lower node coupling capacitor form a capacitor core which comprises m+n capacitor elements; size specifications of the capacitor elements are the same and capacitance values of the capacitor elements are all C0; (m+n)/2 capacitor elements are encapsulated in the upper node coupling capacitor; a first metal expander is overlapped on the upper part; (m+n)/2 capacitor elements are encapsulated in the lower node coupling capacitor; a second metal expander is overlapped on the upper part, and the upper node coupling capacitor and the lower node coupling capacitor are installed on the base after being connected in series and overlapped. The high-voltage capacitive divider is used for a measuring apparatus in an electric power system.

Description

A kind of optical voltage transformer is used high-voltage capacitive divider

Technical field

The utility model belongs to power capacitor and makes the field, is specifically related to the high-voltage capacitive divider that a kind of optical voltage transformer is used.

Background technology

Voltage transformer (VT) is an indispensable measuring equipment in the electric system, development in recent years the novel voltage mutual inductor of various ways.According to the difference of sensing principle, novel voltage mutual inductor can be divided into electronic type voltage transformer and optical voltage transformer.Electronic type voltage transformer generally adopts resistance, electric capacity or Resistor-Capacitor Unit to realize dividing potential drop; Tested voltage signal is taken out from electrical network by voltage divider; Having solved ferroresonance problem and magnetic saturation problem, improved the dynamic response capability of conventional voltage transformer (VT), is its major defect but the voltage divider no-load voltage ratio is unstable, antijamming capability is relatively poor; In addition; Electric resistance partial pressure type electronic type voltage transformer is difficult to actual use because of the restriction that receives resistor power and accuracy in the UHV (ultra-high voltage) AC network, sensing arrangement and electromagnetic screen are complicated, exists the circuit band to be detained the transient state problem that the electric charge reclosing causes and the potential threat of ferroresonance.These key issues make electronic type voltage transformer lose the qualification of contending the desired voltage mutual inductor.Advantages such as optical voltage transformer has that insulation system is simple, dynamic range is big, measuring frequency band is wide, transient response is fast, antijamming capability is strong, no magnetic saturation and ferroresonance, small and light, output digitizing, potential advantages are more obvious.The optical voltage transformer of practical application at present mainly is a capacitance partial pressure type optical voltage transformer, and capacitive divider is its core component.Special at present very few with the research of high-voltage capacitive divider to optical voltage transformer; The way that domestic and international optical voltage transformer researcher takes usually is that capacitance type potential transformer is directly applied in the optical voltage transformer with high-voltage capacitive divider, can bring following problem in actual applications:

(1) the capacitive divider intrinsic standoff ratio is little, and low-pressure side electric capacity output voltage is higher;

(2) receive self and Effect of Environmental, the capacitive divider intrinsic standoff ratio is unstable;

(3) service condition is abominable, and the anti-external electric field interference capability of capacitive divider is relatively poor.

High-voltage capacitive divider shows in the operation practice of transformer station's site of deployment: there is stray capacitance in the high-voltage capacitive divider of actual motion in transformer station between its device body and the earth, the grounded shield; There is alternate coupling capacitance in the capacitive divider of three-phase operation; Environmental baseline (like temperature, filth, sleet) and service condition (like voltage, frequency) etc. can cause the capacitive divider intrinsic standoff ratio to change; Transformer station's electromagnetic environment is complicated, has more serious interphase interference.Therefore when the design capacitance voltage divider, must take into full account the influence of these factors; Yet mutual inductor deviser in the past often only considers the influence factor of capacitive divider body construction; The actual environment that seldom combines mutual inductor in electrical network, to move; There are deviation in its analysis result and actual conditions, and the voltage transformer (VT) product that is up to the standards before causing easily dispatching from the factory is being transported to the but very big situation of site of deployment operation back error.

The utility model content

The utility model is poor for the high-voltage capacitive divider temperature stability that solves existing optical voltage transformer and use; Receive the influence of external condition, the capacitive divider intrinsic standoff ratio is unstable; The problem of anti-external electric field interference performance difference, a kind of optical voltage transformer of proposition is used high-voltage capacitive divider.

A kind of optical voltage transformer of the utility model is used high-voltage capacitive divider, it comprise HV Terminal, loam cake, first metal expander, on save coupling condenser, on save insulating sleeve, insulation full skirt, second metal expander, save insulating sleeve, ground terminal, joint coupling condenser, bottom and base down down, HV Terminal is on the top of high-voltage capacitive divider; Be connected with high voltage bus, the lower end of HV Terminal is provided with loam cake, and loam cake is located at the upper end of joint insulating sleeve; Last joint insulating sleeve is sleeved on the outside of joint coupling condenser; The lower end of saving insulating sleeve down is provided with bottom, and bottom is installed on the base, and following joint insulating sleeve is sleeved on down the outside of joint coupling condenser; Ground terminal is installed on the base; The said joint coupling condenser of going up is formed capacitor core with following joint coupling condenser, and capacitor core comprises m+n capacitor element, and m+n capacitor element size specification is identical; And capacitance equates, is C ₀Wherein, (m+n)/2 a capacitor element is encapsulated in the joint coupling condenser, and (m+n)/2 the upper stack of a capacitor element has first metal expander; (m+n)/2 a capacitor element is encapsulated in down in the joint coupling condenser; (m+n)/2 the upper stack of a capacitor element has second metal expander, on save coupling condenser and the following joint coupling condenser closed assembly of connecting, be installed on the base behind the closed assembly.

A kind of optical voltage transformer of the utility model is used high-voltage capacitive divider, and the secondary capacitor output voltage is reduced in the kilovolt, has improved the temperature stability of optical voltage sensor; Reduce or eliminated of the influence of factors such as stray capacitance and temperature, improved the stability of optical voltage sensor intrinsic standoff ratio the capacitive divider intrinsic standoff ratio; Reduce or eliminated especially interphase interference electric field effects of external interference electric field, further improved the antijamming capability of capacitive divider, improved measuring accuracy.

Description of drawings

Fig. 1 is the structural representation of the utility model; Fig. 2 is the structural representation of capacitor core; Fig. 3 is the circuit model synoptic diagram of capacitive divider; Fig. 4 is the circuit model synoptic diagram of interphase interference; Fig. 5 is equivalent capacity C _{(n+1) p}Counting circuit model synoptic diagram.

Embodiment

Embodiment one, combine Fig. 1 and Fig. 2 that this embodiment is described, a kind of optical voltage transformer use high-voltage capacitive divider, it comprise HV Terminal 1, loam cake 2, first metal expander 3, on save coupling condenser 4, on save insulating sleeve 5, insulation full skirt 6, second metal expander 7, save insulating sleeve 8, ground terminal 9, time joint coupling condenser 10, bottom 11 and base 12 down; HV Terminal 1 is on the top of high-voltage capacitive divider; Be connected with high voltage bus, the lower end of HV Terminal 1 is provided with loam cake 2, and loam cake 2 is located at the upper end of joint insulating sleeve 5; Last joint insulating sleeve 5 is sleeved on the outside of joint coupling condenser 4; The lower end of saving insulating sleeve 8 down is provided with bottom 11, and bottom 11 is installed on the base 12, and following joint insulating sleeve 8 is sleeved on down the outside of joint coupling condenser 10; Ground terminal 9 is installed on the base 12; The said joint coupling condenser 4 of going up is formed capacitor core 13 with following joint coupling condenser 10, and capacitor core 13 comprises m+n capacitor element 16, and m+n capacitor element size specification is identical; And capacitance equates, is C ₀Wherein, (m+n)/2 a capacitor element 16 is encapsulated in the joint coupling condenser 4, and (m+n)/2 the upper stack of a capacitor element 16 has first metal expander 3; (m+n)/2 a capacitor element 16 is encapsulated in down in the joint coupling condenser 10; (m+n)/2 the upper stack of a capacitor element 16 has second metal expander 7, on save coupling condenser 4 and following joint coupling condenser 10 closed assemblies of connecting, be installed in behind the closed assembly on the base 12.

In this embodiment, capacitive divider intrinsic standoff ratio K=1/ (mn+1), irrelevant with the electric capacity of capacitor element, realize adjusting through calculating the quantity m, the n that select capacitor element to intrinsic standoff ratio K.

In this embodiment, said loam cake is for gathering the tetrafluoro loam cake, through screw retention on aluminum base.

In the present embodiment, said upward joint coupling capacitor 4 is identical with the insulation system of following joint coupling capacitor 10, and the diarylethane of employing equivalent insulate and cools off; Said upward joint coupling capacitor 4 and following joint coupling capacitor 10 are independent sealed.

In the present embodiment,, after capacitor core (13) adopted particular structural and encapsulates, the Electric Field Distribution in the capacitive divider was more even, has improved the electro-optic crystal certainty of measurement

Embodiment two, combination Fig. 2 explain this embodiment; This embodiment is with the difference of embodiment one; N capacitor element in the said m+n capacitor adopts and laminates the whole series connection of cascaded structure as high-voltage capacitor 14; The upper end of high-voltage capacitor 14 is connected with high-pressure side, electric capacity C ₁=C ₀/ n.

Embodiment three, combination Fig. 2 explain this embodiment; This embodiment is with the difference of embodiment one; M capacitor element in the said m+n capacitor adopts and laminates the whole parallel connections of parallel-connection structure as secondary capacitor 15; The lower ends of the upper end of secondary capacitor 15 and high-voltage capacitor 14 connects, and the lower end of secondary capacitor 15 is connected with earth terminal, electric capacity C ₂=mC ₀

Embodiment four, this embodiment is that with the difference of embodiment one said first metal expander 3 is identical metal expanders with second metal expander 7.

In this embodiment; In last joint coupling condenser 4 and the following joint coupling condenser 10 identical metal expander is housed; Be respectively first metal expander 3 and second metal expander 7, make and upward save electrical equipment and the symmetrical structure that coupling condenser 4 and following joint coupling condenser 10 have equal number.

Principle of work is: with the 220kV electric pressure is example, and the capacitive divider of the utility model corresponding voltage grade is made up of 176 identical capacity cells (16), m=174 wherein, n=2, the electric capacity C of single capacitor element (16) ₀=0.88 μ F, the electric capacity C of high-voltage capacitor 14 ₁=5057pF, the electric capacity C of secondary capacitor 15 ₂=1.76 μ F, capacitive divider intrinsic standoff ratio K=348, the low pressure end range of nominal tension 360 ± 25V.Experimental result shows that the 220kV optical voltage transformer of being developed has reached designing requirement with high-voltage capacitive divider.

High-voltage capacitive divider places outdoor operation, and when variation of ambient temperature, the electric capacity of its high and low pressure capacitor also can change, and the expression formula of capacitive divider intrinsic standoff ratio K is:

$K=\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{\&Delta;C}}_1}{({\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{\&Delta;C}}_1)+({\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+{\mathrm{\&Delta;C}}_2)}=\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}1}{\mathrm{\&Delta;T}}_{c1}{C}_1}{({\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}1}{\mathrm{\&Delta;T}}_{c1}{C}_1)+({\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}2}{\mathrm{\&Delta;T}}_{c2}{C}_2)}$

(1)

$=\frac{1}{1+\frac{C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}\frac{1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}2}\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="T\; c"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">T</figure-callout>}}_c}{1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}1}{\mathrm{\&Delta;<figure-callout\; id="1"\; label="T\; c"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">T</figure-callout>}}_c}}=\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_2\frac{1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}2}{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T\; c"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">T</figure-callout>}}_c}{1+{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">c</figure-callout>}1}{\mathrm{\&Delta;T}}_{c1}}}\frac{C_1}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000127217540000022.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000127217540000011.png,HDA0000127217540000031.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}=K_T{K}_n$

In the formula, α _C1Be the temperature coefficient of high voltage capacitor (14), α _C2Be the temperature coefficient of low-voltage capacitor (15), Δ T _C1Be the temperature variation of high voltage capacitor (14), Δ T _C2Temperature variation for low-voltage capacitor (15).

The described capacitor element of the utility model (16) adopts film paper composite dielectric structure, can make capacitance temperature factor less relatively; Capacitor core (13) adopts capacitance to equate and the identical capacitor element of size specification (16) combines, and makes the temperature variation of each capacitor element (16) identical; Last joint coupling condenser and the identical insulation system of following joint coupling condenser employing make being heated of voltage divider, electric condition identical.So α _C1=α _C2, Δ T _C1=Δ T _C2, K _T=1, can know the intrinsic standoff ratio of capacitive divider by formula (1)

Remain constant, thereby eliminated the influence of temperature variation to intrinsic standoff ratio.

Take into full account the influence of stray capacitance, corresponding capacitive divider body construction equivalent-circuit model is as shown in Figure 3, and the output voltage mathematics model of the secondary capacitor of capacitive divider (15) is:

${\stackrel{\&CenterDot;}{U}}_{U^{\&prime;}}=\stackrel{\&CenterDot;}{U}\left(X_{U^{\&prime;}}\right)\&ap;(1+\frac{{2C}_H-C_G}{6C_K+C_H+C_G})K_n{\stackrel{\&CenterDot;}{U}}_1=K_c{K}_n{\stackrel{\&CenterDot;}{U}}_1---\left(2\right)$

In the formula, K _cThe voltage divider intrinsic standoff ratio error coefficient that causes for stray capacitance, and

Be tested voltage; L is the capacitive divider length overall; X is the distance apart from the voltage divider bottom of coming into question, and thinks earth terminal x=0, high voltage end x=L, low-voltage end x=X _{U '}C _kFor be uniformly distributed with main capacitance value on the unit of capacity length along total length, its total capacitance value is C _K=C _k/ L, the element capacitance on every dx length is C _k/ dx; C _hFor high-voltage connection and high-pressure side to the distributed capacitance value on the voltage divider body unit length, the total capacitance of this stray capacitance is C _H=C _hL, the capacitance of this stray capacitance on every dx length is C _hDx; C _gFor ground to the distributed capacitance value on the voltage divider body unit length, this stray capacitance total capacitance is C _G=C _gL, the capacitance of this stray capacitance on every dx length is C _gDx.The utility model passes through the design to the body construction of said capacitive divider, makes C _G≈ 2C _HThereby, make the voltage divider intrinsic standoff ratio error coefficient K that stray capacitance causes _c=1, the influence of stray capacitance is dropped to minimum level.

In the actual motion environment, influencing each other between the out of phase high-voltage capacitive divider worked through alternate coupling capacitance.The high-voltage capacitive divider structure of supposing A, B, C three phase optical voltage transformer (VT) is identical.The ground that is without loss of generality is appointed and is got i, and the high-voltage capacitive divider (14) of j (i, j are any two phases in A, B, the C three-phase) two phase optical voltage transformers is as research object, sets up and calculates the mathematical model that interphase interference exerts an influence to the intrinsic standoff ratio of capacitive divider.If the high voltage capacitor of capacitive divider is divided into n capacitor cell along total length, the voltage at division points place is followed successively by to low pressure end from high-pressure side

The electric capacity of each series capacitor element (16) of high voltage capacitor (14) is C _kFor easy analysis, the low-pressure side voltage of voltage divider

Use

Expression, low-voltage capacitor (15) electric capacity is still used C ₂Expression.If C _{(n+1) p}(p=1,2 ..., n, n+1) expression j phase capacitive divider p capacitor element pole plate is to the distribution stray capacitance of i phase capacitive divider and the i equivalent capacitance of the condenser network that constituted of capacitive divider high voltage capacitor mutually.It is as shown in Figure 4 to represent that then j phase capacitive divider produces the circuit model that disturbs to i phase capacitive divider, calculates equivalent capacitance C _{(n+1) p}Circuit model as shown in Figure 5.C in Fig. 5 _H1p, C _H2p..., C _Hnp, C _{H (n+1) p}Represent p capacitor element pole plate of j phase capacitive divider and the i distribution stray capacitance between each capacitor element pole plate of capacitive divider mutually respectively.Make C _1p, C _2p..., C _Np, C _{(n+1) p}Represent the equivalent capacitance of p node of j phase capacitive divider respectively to each node of i phase capacitive divider.Calculate:

$\left\{\begin{array}{cc}{C}_{1p}=C_{h1p}& j=1\\ C_{\mathrm{qp}}=C_{(q-1)p}//C_k+C_{\mathrm{hqp}}& j=\mathrm{2,3},...,n,n+1\end{array}\right.---\left(3\right)$

Because C _H1p, C _H2p..., C _Hnp, C _{H (n+1) p}With respect to C _kFor indivisible, so C _{(n+1) p}Can do approximate processing

According to capacitance partial pressure principle and superposition theorem, the voltage that applies on the j phase capacitive divider always is output as in the interference that i phase capacitive divider secondary capacitor output terminal causes:

${\stackrel{\&CenterDot;}{U}}_{\mathrm{ij}(n+1)}=K_{\mathrm{ij}}{\stackrel{\&CenterDot;}{U}}_j=\underset{p=1}{\overset{n+1}{\mathrm{\&Sigma;}}}{\stackrel{\&CenterDot;}{U}}_{\mathrm{ij}(n+1)p}\&ap;\underset{p=1}{\overset{n+1}{\mathrm{\&Sigma;}}}\frac{C_{(n+1)p}}{C_2}{\stackrel{\&CenterDot;}{U}}_{\mathrm{jp}}$

$=[C_{(n+1)1}+\underset{p=2}{\overset{n}{\mathrm{\&Sigma;}}}\left(\frac{\frac{C_k}{p-1}{C}_{(n+1)p}}{\frac{C_k}{p-1}+\left(\frac{C_k}{n-p+1}\right)//C_2}\right)+\frac{\frac{C_k}{n}{C}_{(n+1)(n+1)}}{\frac{C_k}{n}+C_2}]\frac{{\stackrel{\&CenterDot;}{U}}_j}{C_2}---\left(4\right)$

Visible by formula (4) and since exist alternate coupling capacitance, capacitive divider receive paired running other phase capacitive divider influence and produce amplitude error and phase angle error, K _IjReflected error size.The utility model has taken into full account electromagnetic field environment complicated when voltage transformer (VT) moves at the scene; It is well-designed to combine voltage transformer (VT) actual mathematical model to adopt certain algorithm that structure, quantity, the position of capacitive divider internal capacitor element have been carried out through theoretical analysis, and the body construction that improves said capacitive divider makes K _Ij≈ 1, reduces even eliminated the influence of interphase interference to optical voltage transformer.

In addition, the intrinsic standoff ratio K of capacitor and the electric capacity of capacitor are irrelevant, thereby the designing requirement of capacitor is reduced greatly, make the employing of the capacitor element element that volume is little, price is low become possibility.Under the certain situation of intrinsic standoff ratio K,, can make its quantity m+n minimum through calculating quantity m and the n that selects capacitor element.The capacitive divider that the utility model provides can effectively reduce volume, weight and the production cost of capacitive divider.

Claims (4)

1. an optical voltage transformer is used high-voltage capacitive divider; It comprises HV Terminal (1), loam cake (2), first metal expander (3), on save coupling condenser (4), on save insulating sleeve (5), insulation full skirt (6), second metal expander (7), save insulating sleeve (8), ground terminal (9), joint coupling condenser (10), bottom (11) and base (12) down down; HV Terminal (1) is on the top of high-voltage capacitive divider; Be connected with high voltage bus, the lower end of HV Terminal (1) is provided with loam cake (2), and loam cake (2) is located at the upper end of joint insulating sleeve (5); Last joint insulating sleeve (5) is sleeved on the outside of joint coupling condenser (4); The lower end of saving insulating sleeve (8) down is provided with bottom (11), and bottom (11) is installed on the base (12), and following joint insulating sleeve (8) is sleeved on down the outside of joint coupling condenser (10); Ground terminal (9) is installed on the base (12)

It is characterized in that: said joint coupling condenser (4) and following joint coupling condenser (10) the composition capacitor core (13) gone up, capacitor core (13) comprises m+n capacitor element (16), m+n capacitor element size specification is identical, and capacitance is equal, is C ₀Wherein, (m+n)/2 a capacitor element (16) is encapsulated in the joint coupling condenser (4), and (m+n)/2 the upper stack of a capacitor element (16) has first metal expander (3); (m+n)/2 a capacitor element (16) is encapsulated in down in the joint coupling condenser (10); (m+n)/2 the upper stack of a capacitor element (16) has second metal expander (7), on save coupling condenser (4) and following joint coupling condenser (10) series connection closed assembly, be installed in behind the closed assembly on the base (12).

2. a kind of optical voltage transformer according to claim 1 is used high-voltage capacitive divider; It is characterized in that: n capacitor element in the said m+n capacitor adopts and laminates the whole series connection of cascaded structure as high-voltage capacitor (14); The upper end of high-voltage capacitor (14) is connected electric capacity C with high-pressure side ₁=C ₀/ n.

3. a kind of optical voltage transformer according to claim 1 is used high-voltage capacitive divider; It is characterized in that: m capacitor element in the said m+n capacitor adopts and laminates the whole parallel connections of parallel-connection structure as secondary capacitor (15); The lower ends of the upper end of secondary capacitor (15) and high-voltage capacitor (14) connects; The lower end of secondary capacitor (15) is connected electric capacity C with earth terminal ₂=mC ₀

4. a kind of optical voltage transformer according to claim 1 is used high-voltage capacitive divider, it is characterized in that: said first metal expander (3) is identical metal expander with second metal expander (7).

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