CN107478986A - Method for determining breaker nonuniformity coefficient and correcting divider measurement result - Google Patents

Method for determining breaker nonuniformity coefficient and correcting divider measurement result Download PDF

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CN107478986A
CN107478986A CN201710759947.4A CN201710759947A CN107478986A CN 107478986 A CN107478986 A CN 107478986A CN 201710759947 A CN201710759947 A CN 201710759947A CN 107478986 A CN107478986 A CN 107478986A
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msub
mrow
voltage
breaker
divider
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CN107478986B (en
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杨为
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references

Abstract

The invention discloses a kind of method for being used to determine breaker nonuniformity coefficient and correct divider measurement result, it is related to high-voltage AC breaker technical field, this method includes：Determine the parameter of the circuit element in breaker circuit；Establish breaker and cut-off ac equivalent circuit and pc equivalent circuit after capacitive load；Obtain the transient recovery voltage after alternating current-direct current superposition；The voltage peak of breaker fracture and the offset voltage of divider are obtained according to the transient recovery voltage after superposition；And the nonuniformity coefficient of breaker fracture is determined according to voltage peak, the measurement result of divider is corrected according to offset voltage.Pass through the above method, under the influence of the parameter of circuit element in breaker circuit, it still can accurately and efficiently determine the dynamic change of breaker nonuniformity coefficient, the measurement result of divider is corrected simultaneously, has obtained the transient voltage distribution situation more conformed in engineering with actual condition.

Description

Method for determining breaker nonuniformity coefficient and correcting divider measurement result
Technical field
The present invention relates to high-voltage AC breaker technical field, in particular it relates to for determining breaker nonuniformity coefficient And the method for correction divider measurement result.
Background technology
Breaker is for cutting off the friendship in high voltage direct current transmission project between converter power transformer and AC power The switchgear of wave filter is flowed, alternating current filter can suppress the characteristic harmonics that converter power transformer produces and injects AC system, Reactive power can also be provided to current conversion station.When the power of direct current conveying changes, the reactive power needed for current conversion station It will change, it is therefore desirable to carry out switching filters according to demand.
After breaker surgical filtering device, it will bear alternating current-direct current due to the residual voltage in filter capacity, between fracture and fold The recovery voltage added, the peak value for recovering voltage are up to two times of peak value of alternating voltage.Shunt capacitance when two fractures, simultaneously Join resistance parameter, and the matching of post insulator subparameter is improper or during change, the voltage's distribiutings of two fractures will become uneven It is even, and vary over so that the recovery voltage load that one of fracture is born is excessive, even more than breaker The technical conditions used, so as to cause the fracture of overload to puncture, ultimately result in whole breaker and resume combustion or again occurs Breakdown.
At present, national standard《GB1984-2014 high-voltage AC breakers》The breaker nonuniformity coefficient of middle defined is One fixed value, i.e., do not change with the time, in above-mentioned ginseng when the numerical value is unable in reaction engineering application or experiment station is tested The nonuniformity coefficient of breaker in the case of number change.Therefore, science is established, effective algorithm influences to assess in above-mentioned parameter In the case of, the dynamic change of breaker nonuniformity coefficient is particularly important.
In addition, when high power laboratory station progress breaker cut-offs capacitive load experiment, due to measuring apparatus divider Introduce so that corresponding operating mode produces certain deviation in result of the test and Practical Project.Therefore, it is necessary to result of the test is entered Row correction, so that the transient voltage distribution situation of actual condition must be met.
The content of the invention
It is an object of the invention to provide a kind of for determining breaker nonuniformity coefficient and correcting divider measurement result Method, this method can accurately express the dynamic change of nonuniformity coefficient, and obtain the transient voltage point for meeting actual condition Cloth situation.
To achieve these goals, on the one hand, embodiments of the present invention provide a kind of for determining breaker not The method of coefficient of uniformity, this method comprise the following steps：
The parameter of the circuit element in breaker circuit is determined, cut-offs initial electricity on moment circuit element to obtain electric current Pressure；
Establish breaker and cut-off ac equivalent circuit and pc equivalent circuit after capacitive load；
The transient recovery voltage of the breaker fracture of ac equivalent circuit and pc equivalent circuit is obtained respectively；
By the breaker fracture of the transient recovery voltage of the breaker fracture of ac equivalent circuit and pc equivalent circuit Transient recovery voltage is overlapped, with the transient recovery voltage after being superimposed；
The voltage peak of breaker fracture is obtained according to the transient recovery voltage after superposition；And
The nonuniformity coefficient of breaker fracture is determined according to voltage peak.
Preferably, the initial voltage that electric current cut-offs on moment circuit element is the voltage of the AC power in breaker circuit Peak value.
Preferably, circuit element includes first electric capacity in parallel with two fractures of breaker respectively and first resistor, the Two electric capacity and second resistance and the support insulator between two fractures, parameter include the first capacitance, first resistor Equivalent capacitance value, the equivalent resistance of value, the second capacitance, second resistance value and support insulator.
Preferably, circuit element also includes divider, and divider includes the first divider and the second divider, parameter are also wrapped Include the equivalent capacitance value of the first divider, the equivalent capacitance value of equivalent resistance and the second divider, equivalent resistance.
Preferably, the transient recovery voltage after being superimposed includes：
The first of two fractures of the breaker after superposition in the case of acquisition the first divider of consideration and the second divider Transient recovery voltage and two fractures for not considering the breaker after superposition in the case of the first divider and the second divider The second transient recovery voltage；
First transient recovery voltage of two fractures of breaker is expressed by equation (1) and equation (2) respectively：
Wherein,
Re1For first resistor value, Ce1For the first capacitance, Re2For second resistance value, Ce2For the second capacitance, R0For pillar The equivalent resistance of insulator, C0For the equivalent capacitance value of support insulator, C1For the equivalent of the first divider or the second divider Capacitance, R1The equivalent resistance of first divider or the second divider, CLFor the capacitance of capacitive load, E12(t) it is two First transient recovery voltage of a fracture in individual fracture, E23(t) it is the first transient state of another fracture in two fractures Recover voltage；
Second transient recovery voltage of two fractures of breaker is expressed by equation (3) and equation (4) respectively：
Wherein,
E′12(t) it is the second transient recovery voltage of a fracture in two fractures, E '23(t) in two fractures Second transient recovery voltage of another fracture.
Preferably, the nonuniformity coefficient of the fracture of breaker is expressed by equation (5)：
Wherein, k be fracture nonuniformity coefficient, UpeakFor the voltage peak of fracture, USFor AC power voltage it is effective Value.
On the other hand, embodiments of the present invention provide a kind of method for correcting divider measurement result, should Method comprises the following steps：
The offset voltage of divider is obtained according to the transient recovery voltage after superposition；
The measurement result of divider is corrected according to offset voltage, with the voltage results after being corrected.
Preferably, the offset voltage of divider is obtained according to the transient recovery voltage after superposition to be included according to the disconnected of breaker The first transient recovery voltage and the second transient recovery voltage of mouth obtain the offset voltage of divider, and offset voltage is by equation (7) To express：
Δ u (t)=E ' (t)-E (t) equatioies (7)
Wherein, Δ u (t) is offset voltage, and E (t) is the first transient recovery voltage of fracture, and E ' (t) is the second of fracture Transient recovery voltage；
Voltage results after correction are expressed by equation (8)：
U (t)=u ' (t)+Δ u (t) equatioies (8)
Wherein, u ' (t) is the measurement result of divider, and u (t) is the voltage results after correction.
Pass through above-mentioned technical proposal, under the influence of the parameter of the circuit element in breaker circuit, still can accurately, have Effect ground determines the dynamic change of breaker nonuniformity coefficient, while the measurement result of divider is corrected, and has obtained work The transient voltage distribution situation more conformed in journey with actual condition.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is according to an embodiment of the present invention for determining breaker nonuniformity coefficient and correction divider measurement As a result the flow chart of method；
Fig. 2 shows the circuit diagram of breaker；
Fig. 3 shows that breaker cut-offs the initial voltage distribution map on capacitive load moment circuit element；
Fig. 4 shows that breaker cut-offs the ac equivalent circuit after capacitive load；
Fig. 5 shows that breaker cut-offs the pc equivalent circuit after capacitive load；
Fig. 6 shows that breaker cut-offs another pc equivalent circuit after capacitive load；And
Fig. 7 is the flow chart for being used to select the method for breaker according to an embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Fig. 1 is according to an embodiment of the present invention for determining breaker nonuniformity coefficient and correction divider measurement As a result the flow chart of method.As shown in figure 1, in one embodiment of the present invention, there is provided one kind is used to determine breaker The method of nonuniformity coefficient, this method may comprise steps of：
In step s 11, the parameter of the circuit element in breaker circuit is determined, cut-offs moment circuit elements to obtain electric current Initial voltage on part；
In step s 12, establish breaker and cut-off ac equivalent circuit and pc equivalent circuit (such as figure after capacitive load Shown in 4 to Fig. 6)；
In step s 13, the transient recovery of the breaker fracture of ac equivalent circuit and pc equivalent circuit is obtained respectively Voltage；
In step S14, by the transient recovery voltage of the breaker fracture of ac equivalent circuit and pc equivalent circuit The transient recovery voltage of breaker fracture is overlapped, with the transient recovery voltage after being superimposed；
In step S150, the voltage peak of breaker fracture is obtained according to the transient recovery voltage after superposition；And
In step S160, the nonuniformity coefficient of breaker fracture is determined according to voltage peak.
The initial voltage that electric current is cut-off on moment circuit element may, for example, be the AC power 50 in breaker circuit The peak value of voltage.
Fig. 2 shows the circuit diagram of breaker, and it is first on capacitive load moment circuit element that Fig. 3 shows that breaker cut-offs Beginning voltage distribution graph, as shown in Figures 2 and 3, breaker are double-fracture breaker, and one of fracture 60 is located at AC power 50 Side, another fracture 60 are located at the side of capacitive load 70.Circuit element in breaker circuit can include respectively with breaker Two fractures 60, first electric capacity 10 and first resistor 11 in parallel, the second electric capacity 20 and second resistance 21 and positioned at two fractures Between support insulator 30, the parameter of circuit element can include the first capacitance, first resistor value, the second capacitance, the Two resistance values and the equivalent capacitance value of support insulator, equivalent resistance.
Fig. 4 shows that breaker cut-offs the ac equivalent circuit after capacitive load；Fig. 5 shows that breaker cut-offs capacitive and born A pc equivalent circuit after load；Fig. 6 shows that breaker cut-offs another pc equivalent circuit after capacitive load.Same voltage Shunt capacitance at node can be equivalent to a direct voltage source, and two can be obtained in breaker circuit as shown in Figure 2 Equivalent direct voltage source, therefore breaker cut-offs the circuit structure after capacitive load 70 can be equivalent to an alternating current equivalent electricity Road and two pc equivalent circuits, as shown in Figures 4 to 6.
As shown in figure 1, in one embodiment of the present invention, additionally provide a kind of for correcting divider measurement result Method, this method may comprise steps of：
In step S151, the offset voltage of divider is obtained according to the transient recovery voltage after superposition；
In step S161, the measurement result of divider is corrected according to offset voltage, with the voltage results after being corrected.
As shown in Fig. 2 in one embodiment of the present invention, divider can include the first divider 41 and the second partial pressure Device 42, the parameter of circuit element can also include the equivalent capacitance value of the first divider, equivalent resistance and the second divider Equivalent capacitance value, equivalent resistance.
In a preferred embodiment of the invention, the transient recovery voltage after being superimposed can include：
The first of two fractures of the breaker after superposition in the case of acquisition the first divider of consideration and the second divider Transient recovery voltage and two fractures for not considering the breaker after superposition in the case of the first divider and the second divider The second transient recovery voltage；
First transient recovery voltage of two fractures of breaker is expressed by equation (1) and equation (2) respectively：
Wherein,
Re1For first resistor value, Ce1For the first capacitance, Re2For second resistance value, Ce2For the second capacitance, R0For pillar The equivalent resistance of insulator, C0For the equivalent capacitance value of support insulator, C1For the equivalent of the first divider or the second divider Capacitance, R1The equivalent resistance of first divider or the second divider, CLFor the capacitance of capacitive load, E12(t) it is two First transient recovery voltage of a fracture in individual fracture, E23(t) it is the first transient state of another fracture in two fractures Recover voltage；
Second transient recovery voltage of two fractures of breaker is expressed by equation (3) and equation (4) respectively：
Wherein,
E′12(t) it is the second transient recovery voltage of a fracture in two fractures, E '23(t) in two fractures Second transient recovery voltage of another fracture.
The nonuniformity coefficient of the fracture of breaker can be expressed by equation (5)：
Wherein, k be fracture nonuniformity coefficient, UpeakFor the voltage peak of fracture, USFor AC power voltage it is effective Value.
In embodiments of the present invention, the nonuniformity coefficient of fracture includes dividing according to consideration for two fractures of breaker The first nonuniformity coefficient that the first transient recovery voltage in the case of depressor obtains and according to divider is not considered in the case of The second nonuniformity coefficient that second transient recovery voltage obtains.
First nonuniformity coefficient of two fractures of breaker can be expressed by equation (51)：
Wherein, k1、k2First nonuniformity coefficient of respectively two fractures, U1peak、U2peakThe of respectively two fractures One voltage peak, USFor the virtual value of the voltage of AC power.The first voltage peak value of two fractures can be according to the first transient state Recover voltage to obtain.
Second nonuniformity coefficient of two fractures of breaker can be expressed by equation (52)：
Wherein, k '1、k′2Second nonuniformity coefficient of respectively two fractures, U '1peak、U′2peakRespectively two fractures Second voltage peak value, USFor the virtual value of the voltage of AC power.The second voltage peak value of two fractures can be according to second Transient recovery voltage obtains.
In a preferred embodiment of the invention, the offset voltage of divider is obtained according to the transient recovery voltage after superposition The compensation that divider is obtained according to the first transient recovery voltage of the fracture of breaker and the second transient recovery voltage can be included Voltage, offset voltage can be expressed by equation (7)：
Δ u (t)=E ' (t)-E (t) equatioies (7)
Wherein, Δ u (t) is offset voltage, and E (t) is the first transient recovery voltage of fracture, and E ' (t) is the described of fracture Second transient recovery voltage；
Voltage results after correction can be expressed by equation (8)：
U (t)=u ' (t)+Δ u (t) equatioies (8)
Wherein, u ' (t) is the measurement result of divider, and u (t) is the voltage results after correction.
For double-fracture breaker as shown in Figure 2, divider can include the first divider and the second divider, and first Divider is used to measure the node voltage between two fractures of breaker, and the capacitive that the second divider is used to measure breaker is born Carry the voltage at both ends.The first divider obtained according to the first transient recovery voltage and the second transient recovery voltage and the second partial pressure The offset voltage of device can be expressed by equation (70)：
Wherein, Δ u12(t) it is the offset voltage of the first divider, Δ u23(t) it is the offset voltage of the second divider；
The measurement result of the first divider is corrected according to the offset voltage of the first divider, according to the compensation of the second divider The measurement result of the divider of voltage correction second, voltage results after the correction of the first divider and the second divider can by etc. Formula (80) is expressed：
Wherein, u '12(t)、u'23(t) be respectively the first divider and the second divider measurement result, u12And u (t)23 (t) it is the voltage results after the respectively correction of the first divider and the second divider.
As shown in fig. 7, in the Additional embodiments of the present invention, a kind of method for selecting breaker is additionally provided, This method may comprise steps of：
In the step s 21, the parameter of the circuit element in breaker circuit is determined, cut-offs moment circuit elements to obtain electric current Initial voltage on part；
In step S22, establish breaker and cut-off ac equivalent circuit and pc equivalent circuit after capacitive load；
In step S23, the transient recovery of the breaker fracture of ac equivalent circuit and pc equivalent circuit is obtained respectively Voltage；
In step s 24, by the transient recovery voltage of the breaker fracture of ac equivalent circuit and pc equivalent circuit The transient recovery voltage of breaker fracture is overlapped, with the transient recovery voltage after being superimposed；
In step s 25, the voltage peak of breaker fracture is obtained according to the transient recovery voltage after superposition；
In step S26, the nonuniformity coefficient of breaker fracture is determined according to voltage peak；And
In step s 27, the breaker of requirement of actual working condition is met according to nonuniformity coefficient selection.
, still can be accurately and efficiently under the influence of the parameter of the circuit element in breaker circuit by the above method The dynamic change of breaker nonuniformity coefficient is determined, while the measurement result of divider is corrected, has been obtained in engineering The transient voltage distribution situation more conformed to actual condition.
The nonuniformity coefficient of breaker fracture avoids the disconnected of breaker to provide direct basis from breaker in engineering Mouth is because load is excessive and breakdown, so as to avoid whole breaker that resume combustion or repeated breakdown occurs.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme Monotropic type, these simple variants belong to protection scope of the present invention.It is further to note that in above-mentioned embodiment Described in each particular technique feature, in the case of reconcilable, can by any suitable means be combined, be Unnecessary repetition is avoided, the present invention no longer separately illustrates to various combinations of possible ways.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally The thought of invention, it should equally be considered as content disclosed in this invention.

Claims (7)

  1. A kind of 1. method for being used to determine breaker nonuniformity coefficient and correct divider measurement result, it is characterised in that including Following steps：
    The parameter of the circuit element in breaker circuit is determined, cut-offs initial electricity described in moment on circuit element to obtain electric current Pressure；
    Establish the breaker and cut-off ac equivalent circuit and pc equivalent circuit after capacitive load；
    The transient recovery voltage of the breaker fracture of the ac equivalent circuit and the pc equivalent circuit is obtained respectively；
    By described in the transient recovery voltage of the breaker fracture of the ac equivalent circuit and the pc equivalent circuit The transient recovery voltage of breaker fracture is overlapped, with the transient recovery voltage after being superimposed；
    The voltage peak of the breaker fracture and the offset voltage of divider are obtained according to the transient recovery voltage after superposition；
    The nonuniformity coefficient of the breaker fracture is determined according to the voltage peak；And
    The measurement result of the divider is corrected according to the offset voltage, with the voltage results after being corrected.
  2. 2. according to the method for claim 1, it is characterised in that the electric current cut-offs initial on circuit element described in moment Voltage is the peak value of the voltage of the AC power in the breaker circuit.
  3. 3. according to the method for claim 1, it is characterised in that the circuit element include respectively with the breaker two Individual fracture the first electric capacity and first resistor, the second electric capacity and second resistance and the branch between described two fractures in parallel Post insulator, the parameter include the first capacitance, first resistor value, the second capacitance, second resistance value and the pillar The equivalent capacitance value of insulator, equivalent resistance.
  4. 4. according to the method for claim 3, it is characterised in that the circuit element also includes the divider, described point Depressor includes the first divider and the second divider, the parameter also equivalent capacitance value including first divider, equivalent Resistance value and the equivalent capacitance value of second divider, equivalent resistance.
  5. 5. according to the method for claim 4, it is characterised in that it is described be superimposed after transient recovery voltage include：
    Two fractures of the breaker after superposition in the case of acquisition consideration first divider and the second divider First transient recovery voltage and do not consider the open circuit after superposition in the case of first divider and the second divider Second transient recovery voltage of two fractures of device；
    First transient recovery voltage of two fractures of the breaker is expressed by equation (1) and equation (2) respectively：
    Wherein,
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>a</mi> <mo>=</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>&amp;lsqb;</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>b</mi> <mo>=</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>&amp;lsqb;</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>&amp;lsqb;</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>c</mi> <mo>=</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;lsqb;</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow>
    Re1For the first resistor value, Ce1For first capacitance, Re2For the second resistance value, Ce2For the described second electricity Capacitance, R0For the equivalent resistance of the support insulator, C0For the equivalent capacitance value of the support insulator, C1For described The equivalent capacitance value of one divider or the second divider, R1The equivalent resistance of first divider or the second divider, CL For the capacitance of the capacitive load, E12(t) it is the first transient recovery voltage of a fracture in described two fractures, E23 (t) it is the first transient recovery voltage of another fracture in described two fractures；
    Second transient recovery voltage of two fractures of the breaker is expressed by equation (3) and equation (4) respectively：
    Wherein,
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mi>a</mi> <mo>=</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>&amp;lsqb;</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mo>(</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> <mo>(</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>0</mn> </msub> <mo>)</mo> <mo>&amp;rsqb;</mo> </mtd> </mtr> <mtr> <mtd> <mi>b</mi> <mo>=</mo> <mo>(</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>)</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>(</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> <mo>+</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>(</mo> <msub> <mi>C</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>C</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>L</mi> </msub> <mo>)</mo> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>c</mi> <mo>=</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>.</mo> </mrow>
    E′12(t) it is the second transient recovery voltage of a fracture in described two fractures, E '23(t) it is in described two fractures Another fracture the second transient recovery voltage.
  6. 6. according to the method for claim 5, it is characterised in that the nonuniformity coefficient of the fracture of the breaker is by equation (5) express：
    Wherein, k be the fracture nonuniformity coefficient, UpeakFor the voltage peak of the fracture, USFor the electricity of the AC power The virtual value of pressure.
  7. 7. according to the method for claim 5, it is characterised in that the transient recovery voltage according to after superposition obtains partial pressure The offset voltage of device includes first transient recovery voltage of the fracture according to the breaker and second transient recovery Voltage obtains the offset voltage of divider, and the offset voltage is expressed by equation (7)：
    Δ u (t)=E ' (t)-E (t) equatioies (7)
    Wherein, Δ u (t) is the offset voltage, and E (t) is first transient recovery voltage of the fracture, and E ' (t) is institute State second transient recovery voltage of fracture；
    Voltage results after the correction are expressed by equation (8)：
    U (t)=u ' (t)+Δ u (t) equatioies (8)
    Wherein, u ' (t) is the measurement result of the divider, and u (t) is the voltage results after the correction.
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