CN110907768A - Breakdown positioning method and system for GIS equipment impact voltage withstand test - Google Patents
Breakdown positioning method and system for GIS equipment impact voltage withstand test Download PDFInfo
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- CN110907768A CN110907768A CN201911089844.7A CN201911089844A CN110907768A CN 110907768 A CN110907768 A CN 110907768A CN 201911089844 A CN201911089844 A CN 201911089844A CN 110907768 A CN110907768 A CN 110907768A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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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
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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
- G01R31/3275—Fault detection or status indication
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Abstract
The embodiment of the invention discloses a breakdown positioning method and system for a GIS (gas insulated switchgear) equipment impulse withstand voltage test. The breakdown positioning method comprises the following steps: carrying out an impact voltage withstand test on the GIS equipment under a preset voltage; if the GIS equipment breaks down, acquiring the waveform of the grounding current at a component of the GIS equipment, wherein the component comprises: the device comprises a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch; and according to the waveform of the grounding current, determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down. The embodiment of the invention is used for positioning the breakdown fault of the on-site impulse withstand voltage test of the GIS equipment, can accurately, stably and quickly determine the broken gas chamber of the GIS equipment in the impulse withstand voltage test, has strong practicability and has very important scientific research and practical value.
Description
Technical Field
The invention relates to the technical field of GIS equipment, in particular to a breakdown positioning method and system for a GIS equipment impact voltage withstand test.
Background
Gas-insulated totally-enclosed Switchgear (GIS) has been widely used in substations and power plants of various voltage levels due to its advantages of small floor space, convenient maintenance, low failure rate, etc. In order to ensure safe and reliable operation after commissioning, the design, materials, process, manufacture and main accessories of the equipment are vital, and the equipment needs to be examined in a type test and a factory test, however, unpredictable defects can be introduced in later transportation, installation and debugging, so that the equipment is in failure or even accident after commissioning, and therefore, a handover test before commissioning is indispensable. In recent years, with the continuous and deep research and the continuous upgrading of test equipment, the field operation impulse withstand voltage test gradually becomes an important means for examining the insulation condition of the GIS equipment. Because the defects in the equipment have different influences on gas insulation under different voltage waveforms, the safety requirements of the equipment cannot be met only by carrying out a power frequency voltage withstand test on site, and particularly, the defects on the surface of an insulating basin cause the situation that a plurality of power frequency voltage withstand tests are qualified but are flashover during an impulse voltage withstand test. When the field operation impact pressure resistance test is normalized, the corresponding matched test also needs to be further implemented, wherein the breakdown positioning is an important auxiliary means.
At present, conventional breakdown positioning technologies for GIS equipment include a manual monitoring method, a vibration monitoring method, an ultrasonic monitoring method, a gas decomposition product detection method, an ultrahigh frequency (UHF) detection method, a non-contact sound wave detection method, a built-in optical detection method and the like, but the conventional breakdown positioning technologies are generally applied to power frequency voltage resistance, and due to the particularity of an impact oscillation waveform, the positioning methods have limitations in field impact voltage resistance tests.
Disclosure of Invention
The embodiment of the invention provides a breakdown positioning method and a breakdown positioning system for a GIS (geographic information System) equipment impulse withstand voltage test, which aim to solve the problem that the breakdown positioning method in the prior art has limitation in the field impulse withstand voltage test.
In a first aspect, a breakdown positioning method for a GIS equipment impulse withstand voltage test is provided, which includes:
carrying out an impact voltage withstand test on the GIS equipment under a preset voltage;
if the GIS equipment breaks down, acquiring the waveform of the grounding current at a component of the GIS equipment, wherein the component comprises: the device comprises a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch;
and according to the waveform of the grounding current, determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down.
In a second aspect, a breakdown positioning system for a surge withstand voltage test of GIS equipment is provided, which includes:
the test module is used for carrying out an impact voltage withstand test on the GIS equipment under a preset voltage;
an obtaining module, configured to obtain a waveform of a ground current at a component of the GIS device if the GIS device is broken down, where the component includes: the device comprises a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch;
the first determining module is used for determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down according to the waveform of the grounding current.
Therefore, the embodiment of the invention can be used for breakdown fault positioning of the on-site impulse withstand voltage test of the GIS equipment, can accurately, stably and quickly determine the broken gas chamber of the GIS equipment in the impulse withstand voltage test, has strong practicability and has very important scientific research and practical value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced 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 these drawings without inventive labor.
Fig. 1 is a flowchart of a breakdown positioning method for a GIS device impulse withstand voltage test according to a first embodiment of the present invention;
fig. 2 is a flowchart of a breakdown positioning method for a GIS device impulse withstand voltage test according to a second embodiment of the present invention;
fig. 3 is a flowchart of a breakdown positioning method for a GIS device impulse withstand voltage test according to a third embodiment of the present invention;
fig. 4 is a flowchart of a breakdown positioning method for a GIS device impulse withstand voltage test according to a fourth embodiment of the present invention;
FIG. 5 is a block diagram of a breakdown positioning system for a GIS device impulse withstand voltage test according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the waveform of the ground current with breakdown of the gas chamber of the bushing branch bus in accordance with a preferred embodiment of the present invention;
fig. 7 is a schematic diagram of a waveform of a ground current with breakdown of a gas chamber of an outlet side isolator according to a preferred embodiment of the present invention;
fig. 8 is a schematic view of a waveform of a ground current with breakdown of a gas chamber of a circuit breaker according to a preferred embodiment of the present invention;
FIG. 9 is a schematic diagram of the waveform of the ground current with breakdown of the gas cell of the bus side disconnector according to a preferred embodiment of the present invention;
fig. 10 is a schematic distribution diagram of high-frequency current sensors of the GIS device according to a preferred 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 some, not all, embodiments of the present invention. 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.
Example one
The embodiment of the invention discloses a breakdown positioning method for a GIS equipment impact voltage withstand test. The method is based on the following principle:
when the GIS equipment is subjected to an on-site impact voltage-withstanding test and grounding flashover occurs, breakdown current can be transmitted to two sides of the breakdown point through a shell of the GIS equipment, certain shunting is carried out on the grounding point passing through the shell, branch current flows into a grounding network through a grounding flat iron (grounding down line), and the amplitude of the grounding branch current is related to the grounding impedance at the position. Because the tank body of the GIS equipment can be regarded as a distributed parameter model of capacitance and conductance, the distances from the breakdown point are different, and the waveform and the initial edge of the high-frequency grounding current are different. If the sensors are connected to the grounding downleads before the test, high-frequency grounding current is measured during breakdown, the grounding downlead close to the grounding flashover part can be estimated by comparing the current waveform difference of the grounding downleads, and then the gas chamber with the breakdown flashover is estimated.
Specifically, as shown in fig. 1, the method according to the first embodiment of the present invention includes the following steps:
step S101: and carrying out an impact voltage withstand test on the GIS equipment under a preset voltage.
Generally, the problem of overvoltage can be caused by the fact that the integral bus is subjected to impact voltage resistance on site, so that in order to avoid the problem of overvoltage, the integral bus is not subjected to impact voltage resistance but only subjected to work frequency voltage resistance, and only the air chamber of a non-main bus is examined.
Step S102: and if the GIS equipment is broken down, acquiring the waveform of the grounding current at the component of the GIS equipment.
Wherein, this subassembly includes: the device comprises a sleeve branch bus, a wire outlet side isolating switch, a breaker and a bus side isolating switch. The waveform of the grounding current can be acquired by a high-frequency current sensor. The measuring frequency of the high-frequency current sensor is 5-50 MHz. The high-frequency current sensor can be respectively arranged on a bushing branch bus, an outlet side disconnecting switch, a breaker and a grounding bar of the bus side disconnecting switch or a metal support. It should be understood that the metal support according to the embodiment of the present invention refers to a metal bracket that ensures a fixed position between a housing of the GIS device and a foundation, and a ground bar is disposed at the tail end of the metal bracket for grounding, so that the high-frequency current sensor disposed on the metal support can also collect a ground current. Generally, four channels are provided for testing, one for each component.
Step S103: and determining the breakdown of the air chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge according to the waveform of the grounding current.
Here, the rising edge refers to a waveform of the ground current at a time when the ground current abruptly changes from 0.
The inventors of the present invention summarized the following rules by conducting a number of tests in the field:
(1) the higher the transient oscillation amplitude of the grounding current is, the closer the grounding current is to a breakdown point;
(2) the earlier the transient rising edge of the grounding current is, the closer the grounding current is to the breakdown point;
(3) the steady state amplitude of the ground current is independent of the breakdown point distance.
In an on-site impulse withstand voltage test, if breakdown flashover occurs in GIS equipment, the voltage at the place can be suddenly reduced, a steep front current wave is introduced into a fault grounding point in the process, and huge energy is discharged from the grounding position closest to the fault point, so that the earlier the transient rising edge of grounding current is, the closer the transient rising edge of the grounding current is to the breakdown point; and the steep front current wave can be refracted and reflected on the branch bus and each switch air chamber, so that the grounding position closest to the fault point is superposed with multiple waveforms, and the transient oscillation amplitude of the grounding current close to the breakdown point is higher. When the grounding current goes to a stable state from a transient state, the amplitude of the grounding current is related to the grounding impedance, the grounding impedance is the self value of a grounding system of GIS equipment and is unrelated to breakdown, so that the stable amplitude of the grounding current is unrelated to the distance of a breakdown point, the prior art considers that the stable amplitude of the grounding current is related to the breakdown point, and therefore, the rule summarized by the invention also breaks through the technical prejudice.
As shown in fig. 6 to 9, waveforms of the ground current obtained when breakdown occurs in the bushing branch bus, the outlet-side disconnecting switch, the circuit breaker, and the bus-side disconnecting switch are respectively shown, and it can be seen that breakdown occurs in the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge, which indicates that the breakdown positioning method can accurately determine the gas chamber in which breakdown occurs.
In summary, the breakdown positioning method for the impulse withstand voltage test of the GIS equipment, provided by the embodiment of the invention, is used for breakdown fault positioning of the field impulse withstand voltage test of the GIS equipment, can accurately, stably and quickly determine a broken gas chamber of the GIS equipment in the impulse withstand voltage test, is strong in practicability, and has very important scientific research and practical values.
Example two
The embodiment of the invention discloses a breakdown positioning method for a GIS equipment impact voltage withstand test. The GIS equipment is three-phase common box type GIS equipment. The three phases of the three-phase common box type GIS equipment share a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch.
As shown in fig. 2, the breakdown positioning method for the impulse withstand voltage test of the GIS device in the second embodiment of the present invention specifically includes the following steps:
step S201: a high-frequency current sensor for acquiring the waveform of the grounding current is arranged on a grounding bar or a metal support of a component of the GIS device.
The assembly includes: the high-frequency current sensor is arranged on the grounding bar or the metal support of the bushing branch bus, the outgoing line side disconnecting switch, the circuit breaker and the bus side disconnecting switch. By arranging the high-frequency current sensor on the grounding bar or the metal support of the assemblies, grounding current of the gas chamber corresponding to each assembly, which has a shunting effect on the ground, can be detected. The high-frequency current sensor is adopted, so that the waveform is not seriously distorted, and the transient oscillation amplitude of the waveform of the grounding current can be detected. The measuring frequency of the high-frequency current sensor is 5-50 MHz. Fig. 10 is a schematic distribution diagram of the high-frequency current sensor, in which LCP represents a sink cabinet, DS/ES represents a disconnecting/grounding switch, GCB represents a circuit breaker, VD represents a live display, CT represents a current transformer, and HES represents a fast grounding switch.
Step S202: and simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment under a preset voltage.
Generally, the problem of overvoltage can be caused by the fact that the integral bus is subjected to impact voltage resistance on site, so that in order to avoid the problem of overvoltage, the integral bus is not subjected to impact voltage resistance but only subjected to work frequency voltage resistance, and only the air chamber of a non-main bus is examined.
Step S203: and if the waveform of the voltage applied to the GIS equipment is detected to have a chopping, determining that the GIS equipment breaks down.
Specifically, the voltage divider of the on-site impulse withstand voltage test equipment can be used for detecting, and if the chopping wave is detected, flashover breakdown is indicated. The clip refers to a voltage wave with a steep wave front.
Step S204: and if the GIS equipment is broken down, acquiring the waveform of the grounding current at the component of the GIS equipment.
Specifically, the waveforms of the ground current at the respective components are acquired by the high-frequency current sensor set in step S201. Generally, four channels are provided for testing, one for each component.
Step S205: and determining the breakdown of the air chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge according to the waveform of the grounding current.
Based on the discussion of step S103, it may be determined that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down, and will not be described herein again.
In summary, the breakdown positioning method for the impulse withstand voltage test of the GIS equipment in the second embodiment of the invention is used for breakdown fault positioning of the field impulse withstand voltage test of the three-phase common-box type GIS equipment, can simultaneously perform the withstand voltage test on the three phases, can accurately, stably and quickly determine the broken gas chamber of the GIS equipment in the impulse withstand voltage test, has strong practicability, and has very important scientific research and practical values.
EXAMPLE III
The third embodiment of the invention discloses a breakdown positioning method for a GIS equipment impact voltage withstand test. The GIS equipment is three-phase box-separated GIS equipment. Three phases of the three-phase box-separated GIS equipment respectively use a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch.
Specifically, as shown in fig. 3, the breakdown positioning method for the impulse withstand voltage test of the GIS device in the third embodiment of the present invention specifically includes the following steps:
step S301: a high-frequency current sensor for acquiring the waveform of the grounding current is arranged on a grounding bar or a metal support of a component of the GIS device.
The assembly includes: the high-frequency current sensor is arranged on the grounding bar or the metal support of the bushing branch bus, the outgoing line side disconnecting switch, the circuit breaker and the bus side disconnecting switch of each phase. By arranging the high-frequency current sensor on the grounding bar or the metal support of the assemblies, grounding current of the gas chamber corresponding to each assembly, which has a shunting effect on the ground, can be detected. The high-frequency current sensor is adopted, so that the waveform is not seriously distorted, and the transient oscillation amplitude of the waveform of the grounding current can be detected. The measuring frequency of the high-frequency current sensor is 5-50 MHz.
Step S302: and carrying out an impact withstand voltage test on one phase of the GIS equipment under a preset voltage.
The embodiment only carries out the impulse withstand voltage test to one phase of three-phase box-separated GIS equipment. Generally, the problem of overvoltage can be caused by the fact that the integral bus is subjected to impact voltage resistance on site, so that in order to avoid the problem of overvoltage, the integral bus is not subjected to impact voltage resistance but only subjected to work frequency voltage resistance, and only the air chamber of a non-main bus is examined.
Step S303: and if the waveform of the voltage applied to the GIS equipment is detected to have a chopping, determining that the GIS equipment breaks down.
Specifically, the voltage divider of the on-site impulse withstand voltage test equipment can be used for detecting, and if the waveform of the voltage is chopped, it is indicated that one phase of the GIS equipment for carrying out the impulse withstand voltage test is broken down. The clip refers to a voltage wave with a steep wave front.
Step S304: and if one phase of the GIS equipment is broken down, acquiring the waveform of the grounding current at the component of the broken-down phase of the GIS equipment.
Specifically, the waveforms of the ground currents at the respective components of the breakdown phase are acquired and acquired by the high-frequency current sensor provided in step S301. Generally, four channels are provided for detection, each channel corresponding to each device of the breakdown phase.
Step S305: and determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down according to the waveform of the grounding current.
Based on the discussion of step S103, it may be determined that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down, and details are not repeated herein.
In summary, the breakdown positioning method for the impulse withstand voltage test of the GIS equipment in the third embodiment of the present invention is used for breakdown fault positioning of the field impulse withstand voltage test of the three-phase split-box type GIS equipment, can perform the withstand voltage test on one phase, can accurately, stably and quickly determine a broken gas chamber of the GIS equipment in the impulse withstand voltage test, and has strong practicability and very important scientific research and practical values.
Example four
The fourth embodiment of the invention discloses a breakdown positioning method for a GIS equipment impact voltage withstand test. The GIS equipment is three-phase box-separated GIS equipment. Three phases of the three-phase box-separated GIS equipment respectively use a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch.
Specifically, as shown in fig. 4, the breakdown positioning method for the impulse withstand voltage test of the GIS device in the fourth embodiment of the present invention specifically includes the following steps:
step S401: a high-frequency current sensor for acquiring the waveform of the grounding current is arranged on a grounding bar or a metal support of a component of the GIS device.
The assembly includes: the high-frequency current sensor is arranged on the grounding bar or the metal support of the bushing branch bus, the outgoing line side disconnecting switch, the circuit breaker and the bus side disconnecting switch of each phase. By arranging the high-frequency current sensor on the grounding bar or the metal support of the assemblies, grounding current of the gas chamber corresponding to each assembly, which has a shunting effect on the ground, can be detected. The high-frequency current sensor is adopted, so that the waveform is not seriously distorted, and the transient oscillation amplitude of the waveform of the grounding current can be detected. The measuring frequency of the high-frequency current sensor is 5-50 MHz.
Step S402: and simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment under a preset voltage.
This embodiment is to the three-phase withstand voltage test that strikes of three-phase box-splitting GIS equipment simultaneously. Generally, the problem of overvoltage can be caused by the fact that the integral bus is subjected to impact voltage resistance on site, so that in order to avoid the problem of overvoltage, the integral bus is not subjected to impact voltage resistance but only subjected to work frequency voltage resistance, and only the air chamber of a non-main bus is examined.
Step S403: and if the GIS equipment is broken down, determining the breakdown phase of the GIS equipment.
Whether the GIS equipment breaks down or not can be determined by detecting whether the waveform of the voltage applied to the GIS equipment is chopped or not. And if the carrier occurs, the GIS equipment breaks down. The clip refers to a voltage wave with a steep wave front. Specifically, the detection can be performed through a voltage divider of the field impulse withstand voltage test equipment.
Specifically, the breakdown phase of the GIS equipment is determined through the following steps:
(1) and if the GIS equipment breaks down, detecting whether the ground potential voltage of the GIS equipment rises.
Generally, four channels can be set for detection, and one channel is selected as a trigger channel to detect the ground potential voltage rising condition.
(2) And if the ground potential voltage rises, acquiring the waveform of the ground current at the circuit breaker of each phase of the GIS equipment.
And the waveforms of the grounding currents on the grounding bars or the metal supporting pieces of the three-phase circuit breakers of the GIS equipment are detected by the high-frequency current sensors arranged in the step S401 in the remaining three channels respectively.
(3) And determining one phase of the grounding current with the highest amplitude as a breakdown phase of the GIS device.
The waveform of the grounding current of the breakdown phase is high-amplitude oscillation current wave, and the waveform of the grounding current of the non-breakdown phase does not have obvious high-amplitude current wave, so that one phase of the grounding current with the highest amplitude can be determined as the breakdown phase of the GIS equipment.
Step S404: and under the preset voltage, performing the impulse withstand voltage test on the breakdown phase of the GIS equipment again.
It should be understood that the preset voltages of step S401 and step S404 are equal. Similarly, the problem of overvoltage can be caused by the fact that the integral bus is subjected to impact voltage resistance on site, so that in order to avoid the problem of overvoltage, the integral bus is not subjected to impact voltage resistance but only subjected to work frequency voltage resistance, and only the air chamber of the non-main bus is examined.
Step S405: and if the waveform of the voltage applied to the GIS equipment is detected to have a chopping, determining that the GIS equipment breaks down.
Specifically, the voltage divider of the on-site impulse withstand voltage test equipment can be used for detecting, and if the waveform of the voltage is chopped, it is indicated that the breakdown phase of the GIS equipment for impulse withstand voltage test still breaks down. The clip refers to a voltage wave with a steep wave front.
Step S406: and if the breakdown phase of the GIS equipment still breaks down, acquiring the waveform of the grounding current at the component of the breakdown phase of the GIS equipment.
Specifically, the waveforms of the ground currents at the respective components of the breakdown phase are acquired and acquired by the high-frequency current sensor provided in step S401. Generally, four channels are provided for detection, each channel corresponding to each device of the breakdown phase.
Step S407: and determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down.
Based on the discussion of step S103, it may be determined that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down, and details are not repeated herein.
To sum up, the breakdown positioning method for the impulse withstand voltage test of the GIS equipment in the fourth embodiment of the invention is used for breakdown fault positioning of the field impulse withstand voltage test of the three-phase split-box type GIS equipment, can simultaneously perform the withstand voltage test on three phases, can accurately, stably and quickly determine a broken gas chamber of the GIS equipment in the impulse withstand voltage test, and has strong practicability and very important scientific research and practical values.
The embodiment of the invention also discloses a breakdown positioning system for the GIS equipment impact voltage withstand test. As shown in fig. 5, the system includes the following modules:
the test module 501 is used for performing an impulse withstand voltage test on the GIS equipment under a preset voltage.
The obtaining module 502 is configured to obtain a waveform of a ground current at a component of the GIS device if the GIS device is broken down.
Wherein, the subassembly includes: the device comprises a sleeve branch bus, a wire outlet side isolating switch, a breaker and a bus side isolating switch.
The first determining module 503 is configured to determine, according to the waveform of the ground current, that a gas chamber of a component corresponding to a waveform with a highest transient oscillation amplitude and an earliest rising edge is broken down.
Preferably, the system further comprises:
and the setting module is used for setting a high-frequency current sensor for acquiring the waveform of the grounding current on a grounding bar or a metal support of the assembly of the GIS equipment before the step of carrying out the impulse withstand voltage test on the GIS equipment.
Preferably, the system further comprises:
and the second determining module is used for determining that the GIS equipment breaks down if the waveform of the voltage applied to the GIS equipment is detected to have a chopping wave after the step of carrying out the impulse withstand voltage test on the GIS equipment.
Preferably, when the GIS device is a three-phase common box type GIS device, the test module 501 includes:
and the first test submodule is used for simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment under the preset voltage.
Preferably, when the GIS device is a three-phase box-split GIS device, the test module 501 includes:
and the second test submodule is used for carrying out an impact voltage withstand test on one phase of the GIS equipment under the preset voltage.
The obtaining module 502 includes:
the first acquisition submodule is used for acquiring the waveform of the grounding current at the component of the breakdown phase of the GIS equipment if one phase of the GIS equipment breaks down.
The first determination module 503 includes:
and the first determining submodule is used for determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down according to the waveform of the grounding current.
When the GIS equipment is three-phase box-separated GIS equipment, the test module 501 further includes:
and the third test submodule is used for simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment under the preset voltage.
And the second determining submodule is used for determining the breakdown phase of the GIS equipment if the GIS equipment breaks down.
And the fourth test submodule is used for carrying out the impulse withstand voltage test on the breakdown phase of the GIS equipment again under the preset voltage.
The obtaining module 502 further includes:
and the second acquisition submodule is used for acquiring the waveform of the grounding current at the component of the breakdown phase of the GIS equipment if the breakdown phase of the GIS equipment still breaks down.
The first determination module 503 further includes:
and the third determining submodule is used for determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down.
Preferably, the second determination submodule includes:
and the detection unit is used for detecting whether the ground potential voltage of the GIS equipment is increased or not if the GIS equipment is broken down.
And the acquisition unit is used for acquiring the waveform of the ground current at the circuit breaker of each phase of the GIS equipment if the ground potential voltage is increased.
And the determining unit is used for determining one phase of the grounding current with the highest amplitude as a breakdown phase of the GIS equipment.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
In summary, the breakdown positioning system for the GIS equipment impulse withstand voltage test is used for breakdown fault positioning of the GIS equipment on-site impulse withstand voltage test, can accurately, stably and quickly determine a broken gas chamber of the GIS equipment in the impulse withstand voltage test, has strong practicability, and has very important scientific research and practical values.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A breakdown positioning method for a GIS equipment impulse withstand voltage test is characterized by comprising the following steps:
carrying out an impact voltage withstand test on the GIS equipment under a preset voltage;
if the GIS equipment breaks down, acquiring the waveform of the grounding current at a component of the GIS equipment, wherein the component comprises: the device comprises a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch;
and according to the waveform of the grounding current, determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down.
2. The method of claim 1, wherein prior to the step of performing the impulse withstand voltage test on the GIS device, the method further comprises:
and arranging a high-frequency current sensor for acquiring the waveform of the grounding current on a grounding bar or a metal support of the assembly of the GIS equipment.
3. The method of claim 1, wherein after the step of performing the impulse withstand voltage test on the GIS device, the method further comprises:
and if the waveform of the voltage applied to the GIS equipment is detected to have a chopping, determining that the GIS equipment breaks down.
4. The method of claim 1, wherein when the GIS device is a three-phase common box GIS device, the step of performing the impulse withstand voltage test on the GIS device comprises:
and under the preset voltage, simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment.
5. The method according to claim 1, wherein when the GIS device is a three-phase split-box GIS device, the step of performing the impulse withstand voltage test on the GIS device comprises:
and under the preset voltage, carrying out an impact withstand voltage test on one phase of the GIS equipment.
6. The method of claim 5,
the step of obtaining a waveform of ground current at a component of the GIS device includes:
if one phase of the GIS equipment is broken down, acquiring the waveform of the grounding current at the component of the broken-down phase of the GIS equipment;
the step of determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down includes:
and according to the waveform of the grounding current, determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down.
7. The method according to claim 1, wherein when the GIS device is a three-phase split-box GIS device, the step of performing the impulse withstand voltage test on the GIS device comprises:
under the preset voltage, simultaneously carrying out an impact voltage withstand test on three phases of the GIS equipment;
if the GIS equipment is broken down, determining the breakdown phase of the GIS equipment;
and under the preset voltage, performing the impulse withstand voltage test on the breakdown phase of the GIS equipment again.
8. The method of claim 7, wherein the step of determining the breakdown phase of the GIS device comprises:
if the GIS equipment is broken down, detecting whether the ground potential voltage of the GIS equipment is increased;
if the ground potential voltage rises, acquiring the waveform of the ground current at the circuit breaker of each phase of the GIS equipment;
and determining one phase of the grounding current with the highest amplitude as a breakdown phase of the GIS device.
9. The method of claim 7,
the step of obtaining a waveform of ground current at a component of the GIS device includes:
if the breakdown phase of the GIS equipment still breaks down, acquiring the waveform of the grounding current at the component of the breakdown phase of the GIS equipment;
the step of determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge is broken down includes:
determining that the gas chamber of the component of the breakdown phase corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down.
10. The utility model provides a puncture positioning system for GIS equipment surge withstand voltage test which characterized in that includes:
the test module is used for carrying out an impact voltage withstand test on the GIS equipment under a preset voltage;
an obtaining module, configured to obtain a waveform of a ground current at a component of the GIS device if the GIS device is broken down, where the component includes: the device comprises a sleeve branch bus, an outlet side disconnecting switch, a breaker and a bus side disconnecting switch;
the first determining module is used for determining that the gas chamber of the component corresponding to the waveform with the highest transient oscillation amplitude and the earliest rising edge breaks down according to the waveform of the grounding current.
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| CN201911089844.7A CN110907768A (en) | 2019-11-08 | 2019-11-08 | Breakdown positioning method and system for GIS equipment impact voltage withstand test |
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| CN201911089844.7A CN110907768A (en) | 2019-11-08 | 2019-11-08 | Breakdown positioning method and system for GIS equipment impact voltage withstand test |
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