CN-121997541-A - Design method of process-adaptive gas-insulated substation inductive coupling clamp

CN121997541ACN 121997541 ACN121997541 ACN 121997541ACN-121997541-A

Abstract

The invention relates to the technical field of transformer substation inductive coupling pliers, and particularly discloses a process-adaptive gas-insulated transformer substation inductive coupling pliers design method, which comprises the steps of establishing a quantitative model of process constraint and a process and electrical performance association relation, and determining the working frequency range and parameter constraint of the coupling pliers by combining the test requirement and the field installation condition of a gas-insulated transformer substation; according to the high-frequency transient characteristic of the gas-insulated substation, on the premise of meeting the magnetic saturation requirement, the magnetic core material is selected by taking the cost and the process suitability as optimization targets, the problems that the traditional coupling pliers have narrow frequency range coverage and cannot adapt to the detection of the transient electromagnetic disturbance of the wide frequency band specific to the GIS are solved, and the transient common-mode current of the secondary circuit and the surface current signal of the shell can be effectively coupled.

Inventors

WANG YU
LI BOWEN
XU CHANGBAO
XIN MINGYONG
HE YUMIN
ZHU JIANYANG
Qiu Keyue
GAO JIPU
ZHANG YUELANG
ZHANG HOUYI

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260508
Application Date: 20251218

Claims (10)

1. A design method of an inductance coupling clamp of a gas insulated substation with process adaptation is characterized by comprising the steps of, Establishing a quantitative model of process constraint and a correlation relation between process and electrical performance, and determining the working frequency range and parameter constraint of the coupling clamp by combining the test requirement of the gas-insulated substation and the field installation condition; Constructing an electromagnetic simulation model of the coupling clamp, acquiring key design parameters through simulation, and setting parameter allowance by combining production process deviation and material batch fluctuation; According to the high-frequency transient characteristic of the gas-insulated substation, on the premise of meeting the magnetic saturation requirement, selecting a magnetic core material by taking cost and process suitability as optimization targets; Performing magnetic permeability test on the magnetic core, outputting magnetic circuit parameters when the test passes, and reselecting the magnetic core material when the test fails; Determining magnetic structure parameters based on magnetic circuit parameters and machining errors, and determining shell design parameters by combining machining difficulty, light weight, electromagnetic shielding and heat dissipation requirements; The design parameters of the magnetic group and the shell are corrected by combining the practical use environment limit parameters, material batch data and aging coefficients; And (3) verifying the frequency working performance of the coupling pliers after the parameters are corrected, finishing the design if the frequency working performance is verified, and reselecting the magnetic core or optimizing the parameters of the magnetic group or the shell if the frequency working performance is verified to be passed.
2. The process-adaptive gas-insulated substation inductive coupling clamp design method is characterized in that a process constraint quantization model comprises a capability boundary quantization library of a processing core process, the process and electrical performance association relation is a mapping rule of core process parameters and coupling clamp electrical performance, a low-frequency end of the working frequency band covers target transient current fundamental waves and low-frequency harmonic waves, and a high-frequency end reserves spectrum redundancy, and the parameter constraint at least comprises jaw size suitability, magnetic circuit leakage rate, withstand voltage, frequency response flatness and output impedance matching constraint.
3. The design method of the gas-insulated substation inductive coupling clamp with the process adaptation according to claim 2 is characterized in that the electromagnetic simulation model is a three-dimensional model and at least comprises a magnetic core, a clamp body shell, a winding and an equivalent module of a tested cable, and can simulate the electromagnetic environment of a substation site, the acquisition process of the key design parameters comprises the steps of determining the coupling coefficient, the number of turns of a coil, a winding mode, a magnetic circuit air gap and shell shielding structure parameters through simulation, and the setting basis of parameter allowance is a simulation result of the influence of process errors and material fluctuation on the electromagnetic performance of the coupling clamp.
4. The process-adaptive gas-insulated substation inductive coupling clamp design method according to claim 3 is characterized in that the primary selection basis of the magnetic core material is high-frequency magnetic performance, mechanical performance and environmental resistance of the material, the evaluation index of the process suitability comprises magnetic performance stability and batch processing yield after the material is processed, and the judgment basis of the magnetic saturation requirement is the comparison result of critical saturated magnetic flux density of the magnetic core and actual working magnetic flux density and the saturation inflection point characteristic of a hysteresis loop.
5. The process-adaptive gas-insulated substation inductive coupling clamp design method is characterized in that the critical saturation magnetic flux density of the magnetic core is calculated according to the maximum transient current of the substation and the magnetic circuit structure parameters of the coupling clamp, and the actual working magnetic flux density is obtained by applying an equivalent transient excitation signal to the magnetic core and detecting by a hysteresis loop tester.
6. The design method of the process-adaptive gas-insulated substation inductive coupling clamp is characterized in that the magnetic permeability test mode is to wind a test coil on a magnetic core and connect impedance test equipment, inductance values are obtained through scanning in a preset frequency band to calculate magnetic permeability, and the judging conditions of the passing of the test comprise that the magnetic permeability value reaches the standard, and the magnetic permeability deviation of the magnetic cores in the same batch is within a preset threshold.
7. The method for designing the inductance coupling clamp of the gas-insulated substation with the process adaptation as set forth in claim 6, wherein the magnetic group structural parameters at least comprise magnetic core selection, magnetic core geometric dimensions, jaw structural dimensions and magnetic core protective coating parameters, and the shell design parameters at least comprise shell materials, structural dimensions, high-frequency signal interface specifications and heat dissipation structural forms.
8. The process-adaptive design method of the gas-insulated substation inductive coupling clamp according to claim 7 is characterized in that the practical use environment limit parameter at least comprises an extreme temperature and humidity parameter, the material aging coefficient at least comprises performance attenuation coefficients of a magnetic core protective coating and a shell protective material, and the modification mode is to carry out redundancy compensation or performance calibration on the original design parameter according to the parameter.
9. The design method of the inductance coupling clamp of the gas-insulated substation with the process adaptation according to claim 8, wherein the frequency working performance verification mode is to connect the coupling clamp into a standard test cable, and obtain a frequency response curve of the coupling clamp through signal generating and collecting equipment, and the verification passing judgment standard is that full-band signal response is normal, amplitude fluctuation meets requirements and interference suppression capability meets standards.
10. The method for designing the inductance coupling clamp of the gas-insulated substation with the process adaptation according to claim 9, wherein the testing requirement of the gas-insulated substation is a coupling acquisition requirement for transient common-mode current of a secondary circuit and surface current of a shell, and the field installation condition comprises secondary cable specification and outdoor electromagnetic and temperature and humidity environment conditions.

Description

Design method of process-adaptive gas-insulated substation inductive coupling clamp Technical Field The invention relates to the technical field of transformer substation inductive coupling pliers, in particular to a process-adaptive gas-insulated transformer substation inductive coupling pliers design method. Background For Gas Insulated Substations (GIS), high frequency transients may propagate within the metal housing with SF6 gas. In theory, the high frequency transients are confined within the housing due to skin effects, causing no problems. However, the discontinuity of the housing causes a part of the transient to propagate to the outer surface of the housing, resulting in an increase of the housing potential, and the current flowing on the outer surface of the housing generates a radiated electromagnetic field in the environment of the transformer substation, which not only affects the surrounding electromagnetic environment of the transformer substation, but may also interfere with the normal operation of nearby electronic equipment. The rise in transient ground potential is a direct source of transient common mode current on the secondary circuit. The radiated electromagnetic field also induces a common mode current on the secondary circuit. Measurement shows that the maximum frequency of the frequency spectrum density significant component of the current can reach 30 MHz-50 MHz, and the problems of secondary equipment sampling error increase, communication interruption and the like can be caused, so that the safe and stable operation of the transformer substation is affected. The extremely rapid transient overvoltage (VFTO) related to high-frequency transient can cause uneven electric field distribution, aggravate dielectric loss of an insulating material, enable the basin-type insulator to reduce the flashover voltage along the surface, increase the discharge probability of an air gap inside the insulating material, reduce the insulating performance of equipment and present insulation breakdown risks. Due to the reduction of the size of the transformer substation, the use of a Gas Insulated Substation (GIS) and the installation position of the electronic equipment are closer to the switching device, so that the distance between the two devices is reduced, and therefore the frequency environment of the high-voltage transformer substation (GS, including AIS) becomes more severe than the past, which makes the secondary equipment face more complex electromagnetic interference, and the current damped oscillatory wave immunity and damped oscillatory magnetic field immunity standard test is difficult to effectively check the immunity of the on-site secondary equipment of the transformer substation to relevant transient electromagnetic disturbances. Disclosure of Invention Therefore, the technical problem to be solved by the invention is that the existing coupling pliers have the defects of frequency band coverage, anti-saturation capability, anti-interference performance and process suitability. The technical problem is solved by the following technical scheme that the invention provides a design method of an inductance coupling clamp of a gas-insulated substation, which is adaptive to a process, and comprises the steps of establishing a quantitative model of process constraint and a correlation relationship between process and electrical performance, and determining the working frequency range and parameter constraint of the coupling clamp by combining the test requirement of the gas-insulated substation and the field installation condition; Constructing an electromagnetic simulation model of the coupling clamp, acquiring key design parameters through simulation, and setting parameter allowance by combining production process deviation and material batch fluctuation; According to the high-frequency transient characteristic of the gas-insulated substation, on the premise of meeting the magnetic saturation requirement, selecting a magnetic core material by taking cost and process suitability as optimization targets; Performing magnetic permeability test on the magnetic core, outputting magnetic circuit parameters when the test passes, and reselecting the magnetic core material when the test fails; Determining magnetic structure parameters based on magnetic circuit parameters and machining errors, and determining shell design parameters by combining machining difficulty, light weight, electromagnetic shielding and heat dissipation requirements; The design parameters of the magnetic group and the shell are corrected by combining the practical use environment limit parameters, material batch data and aging coefficients; And (3) verifying the frequency working performance of the coupling pliers after the parameters are corrected, finishing the design if the frequency working performance is verified, and reselecting the magnetic core or optimizing the parameters of the magnetic group or the shell if the fre