CN113391255A - Fault detection method, device, equipment and medium for capacitor voltage transformer - Google Patents

Fault detection method, device, equipment and medium for capacitor voltage transformer Download PDF

Info

Publication number
CN113391255A
CN113391255A CN202110872278.8A CN202110872278A CN113391255A CN 113391255 A CN113391255 A CN 113391255A CN 202110872278 A CN202110872278 A CN 202110872278A CN 113391255 A CN113391255 A CN 113391255A
Authority
CN
China
Prior art keywords
voltage transformer
capacitor voltage
port
transfer function
fault
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.)
Pending
Application number
CN202110872278.8A
Other languages
Chinese (zh)
Inventor
舒想
周原
杨贤
马志钦
邰彬
林春耀
蔡玲珑
靳宇晖
周丹
姜烁
司马文霞
杨鸣
张耀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
Original Assignee
Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong Power Grid Co Ltd, Electric Power Research Institute of Guangdong Power Grid Co Ltd filed Critical Guangdong Power Grid Co Ltd
Priority to CN202110872278.8A priority Critical patent/CN113391255A/en
Publication of CN113391255A publication Critical patent/CN113391255A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/15—Correlation function computation including computation of convolution operations

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Algebra (AREA)
  • Power Engineering (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention discloses a fault detection method, a fault detection device, terminal equipment and a medium for a capacitor voltage transformer, wherein the method comprises the following steps: acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state; respectively constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state, and taking the voltage transfer functions as a first transfer function and a second transfer function; respectively acquiring frequency response characteristic curves of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve; and comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer. Compared with the conventional method for judging whether the capacitor voltage transformer fails according to the secondary voltage signal, the method provided by the invention can effectively judge the failure type of the capacitor voltage transformer, and has the advantages of easiness in operation and high accuracy.

Description

Fault detection method, device, equipment and medium for capacitor voltage transformer
Technical Field
The invention relates to the technical field of power equipment fault detection, in particular to a method, a device, equipment and a medium for detecting faults of a capacitor voltage transformer.
Background
The capacitor voltage transformer (capacitive voltage transformer) is an important voltage signal acquisition device for metering, controlling and protecting a power grid, and is widely used in a high-voltage line. Because the internal elements of the capacitor voltage transformer are complex and are easily influenced by external environmental factors, the frequency of faults is high. In actual operation, the short circuit fault of the capacitive voltage transformer port can cause the residual port to generate error or distorted signals, thereby seriously threatening the safe operation of a power grid.
At present, for the short-circuit fault condition of a port of a capacitor voltage transformer, judgment is mainly performed from the change of a secondary voltage signal, but the influence factors causing the change of the secondary voltage are numerous, the relation between the short-circuit fault of the port of the capacitor voltage transformer and the output signal of the capacitor voltage transformer cannot be accurately reflected only by taking the parameter as a judgment index, and meanwhile, the fault type of the capacitor voltage transformer is difficult to judge.
Disclosure of Invention
The invention aims to provide a fault detection method, a fault detection device, equipment and a fault detection medium for a capacitor voltage transformer, and aims to solve the problems that in the prior art, the accuracy is low and the fault type is difficult to determine when the capacitor voltage transformer is judged to be in fault according to the change condition of a secondary voltage signal.
In order to achieve the above object, the present invention provides a method for detecting a fault of a capacitive voltage transformer, comprising:
acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state;
respectively constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state, and taking the voltage transfer functions as a first transfer function and a second transfer function;
respectively acquiring frequency response characteristic curves of H parameters of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve;
and comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
Further, the acquiring scattering parameters of the capacitor voltage transformer in a fault operation state includes:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
Further, the constructing the corresponding voltage transfer function by using the scattering parameters in the healthy operation state and the fault operation state respectively includes:
obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure BDA0003189219130000021
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
constructing a transfer function matrix T of the capacitor voltage transformer:
Figure BDA0003189219130000022
Figure BDA0003189219130000023
Figure BDA0003189219130000024
Figure BDA0003189219130000031
Figure BDA0003189219130000032
wherein A is a reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
constructing a voltage transfer function H of the capacitor voltage transformer:
Figure BDA0003189219130000033
further, scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state are obtained by using a vector network analyzer.
The invention also provides a fault detection device for the capacitor voltage transformer, which comprises the following components:
the parameter acquisition unit is used for acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state;
the transfer function construction unit is used for constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state respectively as a first transfer function and a second transfer function;
a characteristic curve acquiring unit, configured to acquire frequency response characteristic curves of H parameters of the first transfer function and the second transfer function respectively as a first characteristic curve and a second characteristic curve;
and the fault detection unit is used for comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
Further, the parameter obtaining unit is further configured to:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
Further, the transfer function constructing unit is further configured to:
obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure BDA0003189219130000041
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
constructing a transfer function matrix T of the capacitor voltage transformer:
Figure BDA0003189219130000042
Figure BDA0003189219130000043
Figure BDA0003189219130000044
Figure BDA0003189219130000045
Figure BDA0003189219130000046
wherein A is a reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
constructing a voltage transfer function H of the capacitor voltage transformer:
Figure BDA0003189219130000047
further, the parameter obtaining unit is further configured to obtain scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state by using a vector network analyzer.
The present invention also provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of capacitive voltage transformer fault detection as described in any one of the above.
The present invention also provides a computer-readable storage medium having stored thereon a computer program for execution by a processor to implement the capacitive voltage transformer fault detection method as defined in any one of the above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a fault detection method of a capacitor voltage transformer, which comprises the steps of obtaining scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state; respectively constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state, and taking the voltage transfer functions as a first transfer function and a second transfer function; respectively acquiring frequency response characteristic curves of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve; and comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer. Compared with the conventional method for judging whether the capacitor voltage transformer fails according to the secondary voltage signal, the method provided by the invention can effectively judge the failure type of the capacitor voltage transformer, and has the advantages of easiness in operation and high accuracy.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for detecting a fault of a capacitor voltage transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a network analyzer for measuring scattering parameters of a capacitor voltage transformer in different operating states according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a frequency response curve of an H parameter of a capacitor voltage transformer in different operating states according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fault detection apparatus for a capacitor voltage transformer according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a method for detecting a fault of a capacitive voltage transformer, including the following steps:
and S10, acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state.
In the step, scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state are mainly obtained.
In one embodiment, a vector network analyzer is used for acquiring scattering parameters of the capacitor voltage transformer in different operating states. As shown in fig. 2, the network analyzer used in this embodiment is E5061B, and during measurement, one end of the network analyzer is mainly connected to one end of a capacitive voltage divider in the capacitive voltage transformer, and the other end is connected to a short-circuit point position of a port of the intermediate transformer, and then a corresponding scattering parameter is obtained.
In one embodiment, acquiring scattering parameters of the capacitor voltage transformer in a fault operation state includes:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
S20, constructing corresponding voltage transfer functions as a first transfer function and a second transfer function by using scattering parameters in a healthy operation state and a fault operation state respectively;
in this step, the scattering parameters in the healthy operation state and the scattering parameters in the three fault operation states of the capacitor voltage transformer obtained in step S10 are mainly used to construct a corresponding voltage transfer function.
In one embodiment, the procedure for constructing the voltage transfer function using scattering parameters is as follows:
1) obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure BDA0003189219130000071
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
2) constructing a transfer function matrix T of the capacitor voltage transformer:
Figure BDA0003189219130000072
Figure BDA0003189219130000073
Figure BDA0003189219130000074
Figure BDA0003189219130000081
Figure BDA0003189219130000082
wherein A is a reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
3) constructing a voltage transfer function H of the capacitor voltage transformer:
Figure BDA0003189219130000083
s30, respectively acquiring frequency response characteristic curves of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve;
in this step, according to the voltage transmission parameter H obtained in step S20, a variation curve of the amplitude of the H parameter with the frequency in the normal state and the port short-circuit fault state of the capacitive voltage transformer is drawn, as shown in fig. 3. As can be seen from fig. 3, there is only one frequency response characteristic curve, i.e., the first characteristic curve, of the capacitor voltage transformer in the normal (healthy) operating state; and the frequency response characteristic curve in the fault operation state, namely the second characteristic curve has three. At the same frequency, the H parameter value is highest in normal (healthy) operating conditions, i.e. the value of the H parameter decreases when the ports are short circuited.
And S40, comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
In the step, the H parameters of the capacitive voltage transformer in different states are compared and analyzed, so that the change rule of the voltage transfer function of the capacitive voltage transformer in the frequency domain when the port of the capacitive voltage transformer is in short circuit fault is obtained, and the fault detection result of the port of the capacitive voltage transformer is obtained.
Compared with the conventional method for judging whether the capacitor voltage transformer fails according to the secondary voltage signal, the fault detection method for the capacitor voltage transformer provided by the embodiment of the invention can effectively judge the fault type of the capacitor voltage transformer, and has the advantages of easiness in operation and high accuracy.
Referring to fig. 4, an embodiment of the present invention further provides a device for detecting a fault of a capacitive voltage transformer, including:
the parameter acquisition unit 01 is used for acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state;
a transfer function constructing unit 02 for constructing corresponding voltage transfer functions as a first transfer function and a second transfer function by using scattering parameters in a healthy operation state and a fault operation state, respectively;
a characteristic curve obtaining unit 03, configured to obtain frequency response characteristic curves of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve, respectively;
and the fault detection unit 04 is used for comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
In an embodiment, the parameter obtaining unit 01 is further configured to:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
In an embodiment, the transfer function constructing unit 02 is further configured to:
obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure BDA0003189219130000091
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
constructing a transfer function matrix T of the capacitor voltage transformer:
Figure BDA0003189219130000092
Figure BDA0003189219130000101
Figure BDA0003189219130000102
Figure BDA0003189219130000103
Figure BDA0003189219130000104
in the formula, A isA reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
constructing a voltage transfer function H of the capacitor voltage transformer:
Figure BDA0003189219130000105
in a certain embodiment, the parameter obtaining unit 01 is further configured to obtain scattering parameters of the capacitor voltage transformer in a healthy operating state and a fault operating state by using a vector network analyzer.
Compared with the existing method for judging whether the capacitor voltage transformer has a fault according to the secondary voltage signal, the fault type of the capacitor voltage transformer can be effectively judged, and the method has the advantages of easiness in operation and high accuracy.
Referring to fig. 5, an embodiment of the present invention further provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a capacitive voltage transformer fault detection method as described above.
The processor is used for controlling the overall operation of the terminal equipment so as to complete all or part of the steps of the capacitor voltage transformer fault detection method. The memory is used to store various types of data to support operation at the terminal device, and these data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to perform the method for detecting the fault of the capacitive voltage transformer according to any one of the above embodiments, and achieve the technical effects consistent with the above method.
In another exemplary embodiment, a computer readable storage medium is also provided, which includes program instructions, which when executed by a processor, implement the steps of the capacitor voltage transformer fault detection method according to any one of the above embodiments. For example, the computer readable storage medium may be the above memory including program instructions, which are executable by a processor of a terminal device to implement the method for detecting a fault of a capacitor voltage transformer according to any one of the above embodiments, and achieve the technical effects consistent with the above method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A fault detection method for a capacitor voltage transformer is characterized by comprising the following steps:
acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state;
respectively constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state, and taking the voltage transfer functions as a first transfer function and a second transfer function;
respectively acquiring frequency response characteristic curves of H parameters of the first transfer function and the second transfer function as a first characteristic curve and a second characteristic curve;
and comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
2. The method for detecting the fault of the capacitor voltage transformer according to claim 1, wherein the obtaining scattering parameters of the capacitor voltage transformer in the fault operation state comprises:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
3. The method for detecting the fault of the capacitor voltage transformer according to claim 2, wherein the step of constructing the corresponding voltage transfer function by using the scattering parameters in the healthy operation state and the fault operation state respectively comprises the following steps:
obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure FDA0003189219120000011
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
constructing a transfer function matrix T of the capacitor voltage transformer:
Figure FDA0003189219120000021
Figure FDA0003189219120000022
Figure FDA0003189219120000023
Figure FDA0003189219120000024
Figure FDA0003189219120000025
wherein A is a reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
constructing a voltage transfer function H of the capacitor voltage transformer:
Figure FDA0003189219120000026
4. the method for detecting the fault of the capacitor voltage transformer according to any one of claims 1 to 3, wherein a vector network analyzer is used for acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state.
5. A capacitive voltage transformer fault detection device, comprising:
the parameter acquisition unit is used for acquiring scattering parameters of the capacitor voltage transformer in a healthy operation state and a fault operation state;
the transfer function construction unit is used for constructing corresponding voltage transfer functions by using scattering parameters in a healthy operation state and a fault operation state respectively as a first transfer function and a second transfer function;
a characteristic curve acquiring unit, configured to acquire frequency response characteristic curves of H parameters of the first transfer function and the second transfer function respectively as a first characteristic curve and a second characteristic curve;
and the fault detection unit is used for comparing the amplitudes of the first characteristic curve and the second characteristic curve to obtain a fault detection result of the capacitor voltage transformer.
6. The capacitive voltage transformer fault detection device according to claim 5, wherein the parameter obtaining unit is further configured to:
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
short-circuiting the secondary side ports 1a-1n of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain scattering parameters at the moment;
and short-circuiting the secondary side port da-dn of the capacitor voltage transformer, and taking the high-voltage side and the 2a-2n ports as a two-port network to obtain the scattering parameters at the moment.
7. The capacitive voltage transformer fault detection device according to claim 6, wherein the transfer function constructing unit is further configured to:
obtaining a scattering parameter matrix of a two-port network of the capacitor voltage transformer:
Figure FDA0003189219120000031
in the formula, a1、a2Normalized incident scattering variable for capacitive voltage transformer port, b1、b2Is a normalized reflection scattering variable, S, of a port of a capacitive voltage transformer11、S12、S21、S22The two-port network is respectively used for reflecting the refraction and reflection characteristics of the two-port network of the capacitor voltage transformer;
constructing a transfer function matrix T of the capacitor voltage transformer:
Figure FDA0003189219120000032
Figure FDA0003189219120000033
Figure FDA0003189219120000041
Figure FDA0003189219120000042
Figure FDA0003189219120000043
wherein A is a reverse voltage gain; b is reverse transfer impedance; c is a reverse transfer admittance; d is the reverse current gain, Z0Is the reference impedance of the port; v1、V2Is the port voltage; i is1、I2Is the port current;
constructing a voltage transfer function H of the capacitor voltage transformer:
Figure FDA0003189219120000044
8. the device for detecting the fault of the capacitor voltage transformer according to any one of claims 5 to 7, wherein the parameter acquiring unit is further configured to acquire the scattering parameters of the capacitor voltage transformer in the healthy operating state and the fault operating state by using a vector network analyzer.
9. A terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of capacitive voltage transformer fault detection as claimed in any one of claims 1-4.
10. A computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the capacitive voltage transformer fault detection method according to any one of claims 1 to 4.
CN202110872278.8A 2021-07-30 2021-07-30 Fault detection method, device, equipment and medium for capacitor voltage transformer Pending CN113391255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110872278.8A CN113391255A (en) 2021-07-30 2021-07-30 Fault detection method, device, equipment and medium for capacitor voltage transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110872278.8A CN113391255A (en) 2021-07-30 2021-07-30 Fault detection method, device, equipment and medium for capacitor voltage transformer

Publications (1)

Publication Number Publication Date
CN113391255A true CN113391255A (en) 2021-09-14

Family

ID=77622407

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110872278.8A Pending CN113391255A (en) 2021-07-30 2021-07-30 Fault detection method, device, equipment and medium for capacitor voltage transformer

Country Status (1)

Country Link
CN (1) CN113391255A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103344936A (en) * 2013-07-08 2013-10-09 广东电网公司佛山供电局 Method for fault simulation test of capacitor voltage transformer
CN110361686A (en) * 2019-08-28 2019-10-22 华北电力大学（保定） Capacitance type potential transformer fault detection method based on multi-parameter
CN113075473A (en) * 2021-03-23 2021-07-06 广东电网有限责任公司电力科学研究院 Method and device for detecting breakdown of capacitive element of capacitive voltage transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103344936A (en) * 2013-07-08 2013-10-09 广东电网公司佛山供电局 Method for fault simulation test of capacitor voltage transformer
CN110361686A (en) * 2019-08-28 2019-10-22 华北电力大学（保定） Capacitance type potential transformer fault detection method based on multi-parameter
CN113075473A (en) * 2021-03-23 2021-07-06 广东电网有限责任公司电力科学研究院 Method and device for detecting breakdown of capacitive element of capacitive voltage transformer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ZHANG ZHONGYUAN ET AL.: "A High-Frequency Circuit Model of a Potential Transformer for the Very Fast Transient Simulation in GIS", 《IEEE TRANSACTIONS ON POWER DELIVERY》 *
张广勇: "1000kV电容式电压互感器宽频等效电路建模和应用研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 *

Similar Documents

Publication Publication Date Title
CN113075473B (en) Method and device for detecting breakdown of capacitive element of capacitive voltage transformer
US11243259B2 (en) Insulation resistance detection circuit, detection method, and detection apparatus
US20050093554A1 (en) System and method for determining S-parameters using a load
CN109373883B (en) Power cable length measuring method, computer readable storage medium and electronic terminal
CN109443669B (en) Water leakage detection method and device
CN116500339A (en) BMS insulation resistance detection circuit and method, storage medium and electronic equipment
CN113391255A (en) Fault detection method, device, equipment and medium for capacitor voltage transformer
CN110208596A (en) Load current monitoring circuit and method
CN113866504A (en) Detection circuit, detection device and detection method for insulation impedance
EP3779474A1 (en) Measuring electrical energy consumption
CN116256601A (en) Sensing method and sensing device for single-phase earth fault of power distribution network and power distribution network
CN108828316B (en) Line parameter measuring method and device and electronic equipment
CN115754879A (en) Wiring fault detection circuit of current transformer and detection method thereof
CN116148719A (en) Lightning arrester state monitoring method, device, equipment and storage medium
CN116125163A (en) Resistance testing device and resistance testing method
US11150308B2 (en) Battery management device, method and chip
CN112098891A (en) Repetitive pulse parameter optimization method and device for generator rotor turn-to-turn short circuit diagnosis
CN109407042B (en) Intelligent electric meter calibration method
CN109713641B (en) Generator stator grounding protection system and parameter measurement method
CN112014685A (en) Intelligent cable detection device
CN111596115B (en) Method for measuring output current by resistance compensation and conversion circuit thereof
CN211928149U (en) On-spot checking device of current type on-line monitoring equipment
CN115224674B (en) Differential protection method, device and medium for power distribution network with inversion type distributed power supply
CN113447537B (en) Method and device for measuring dielectric spectrum of oilpaper insulating frequency domain, storage medium and terminal
CN102033158B (en) Method and device for measuring prospective short-circuit current

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210914

RJ01 Rejection of invention patent application after publication