CN111562468B - GIS partial discharge signal measurement system and GIS partial discharge fault diagnosis method - Google Patents
GIS partial discharge signal measurement system and GIS partial discharge fault diagnosis method Download PDFInfo
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- CN111562468B CN111562468B CN202010256528.0A CN202010256528A CN111562468B CN 111562468 B CN111562468 B CN 111562468B CN 202010256528 A CN202010256528 A CN 202010256528A CN 111562468 B CN111562468 B CN 111562468B
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a GIS partial discharge signal measuring system which can synchronously and respectively acquire pulse current partial discharge signals and ultrahigh frequency partial discharge signals inside and outside a metal shielding box of a GIS. Based on the GIS partial discharge signal measurement system, the invention provides a GIS partial discharge fault diagnosis method, which determines the GIS partial discharge fault according to the obtained partial discharge signal and the preset partial discharge fault criterion. The invention adopts the suspension shielding measurement, so that the external interference can be effectively inhibited, and the measured pulse current partial discharge signal and the ultrahigh frequency partial discharge signal are more accurate; the pulse current partial discharge signal and the characteristic value of the ultrahigh frequency partial discharge signal are used as the basis for judging whether the GIS has the partial discharge defect, so that the method has the advantages of strong field operability, accuracy in judgment, sensitive response, quantitative judgment, easiness in implementation and the like, and can be widely applied to diagnosis of GIS partial discharge faults.
Description
Technical Field
The invention relates to the technical field of GIS partial discharge fault diagnosis, in particular to a GIS partial discharge signal measurement system and a GIS partial discharge fault diagnosis method.
Background
A Gas Insulated Switchgear GIS (Gas Insulated Switchgear) is a critical device of a power system, and its main function is to remove a power system fault and change the system operation mode. With the increase of the scale of a power grid in China, GIS faults occur frequently, and in order to guarantee the quality of GIS products, a pulse current partial discharge test needs to be carried out in a factory test to diagnose the partial discharge faults of the GIS.
However, in a GIS partial discharge factory test, due to a complex factory environment, a pulse current partial discharge test is often subject to electrical interference from a power supply and heavy equipment, resulting in low partial discharge measurement sensitivity, and a partial discharge fault of the GIS cannot be effectively detected.
Therefore, a GIS partial discharge fault diagnosis method with strong anti-interference capability and high measurement sensitivity is needed.
Disclosure of Invention
The invention provides a GIS partial discharge signal measurement system and a partial discharge fault diagnosis method, which aim to solve the problem of how to accurately and quickly determine the GIS partial discharge fault.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a GIS partial discharge signal measurement system, the system including: the gas insulated switchgear GIS comprises a voltage source, a transition unit, a gas insulated switchgear GIS and a metal shielding box, wherein the voltage source, the transition unit and the gas insulated switchgear GIS are connected in sequence; the metal shielding box is respectively connected with the transition unit and the ground end; the transition unit is used for communicating the voltage source with a high-voltage conductor of the GIS to realize the sealed connection of the voltage source and the housing of the GIS;
the measurement system further comprises:
the first GIS pulse current partial discharge measurement unit is arranged between the GIS and the metal shielding box and used for acquiring a first GIS pulse current partial discharge signal;
the second GIS pulse current partial discharge measurement unit is arranged at the power distribution capacitor of the voltage source and used for acquiring a second GIS pulse current partial discharge signal;
the first GIS ultrahigh frequency partial discharge measurement unit is arranged between the GIS and the metal shielding box and used for acquiring a first GIS ultrahigh frequency partial discharge signal;
and the second GIS ultrahigh frequency partial discharge measurement unit is arranged outside the metal shielding box and is used for acquiring a second GIS ultrahigh frequency partial discharge signal.
Preferably, the GIS is placed on an insulation sleeper, and the housing of the GIS is insulated and isolated from the ground.
Preferably, the transition unit is connected with the GIS through an epoxy insulation flange and a metal bolt with an insulation sheath, so that the transition unit is insulated and isolated from a housing of the GIS, and the housing potential suspension of the GIS is realized.
Preferably, wherein the voltage source comprises: the power supply and the armored transformer are connected with the transition unit.
According to another aspect of the present invention, there is provided a GIS partial discharge fault diagnosis method based on the GIS partial discharge signal measurement system as described above, the method including:
synchronously acquiring a first GIS pulse current partial discharge signal, a second GIS pulse current partial discharge signal, a first GIS ultrahigh frequency partial discharge signal and a second GIS ultrahigh frequency partial discharge signal in a preset time period;
respectively determining a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity according to the acquired first GIS pulse current partial discharge signal, the acquired second GIS pulse current partial discharge signal, the acquired first GIS ultrahigh frequency partial discharge signal and the acquired second GIS ultrahigh frequency partial discharge signal;
and determining the partial discharge fault of the GIS according to the first partial discharge characteristic quantity, the second partial discharge characteristic quantity, the third partial discharge characteristic quantity and the fourth partial discharge characteristic quantity and a preset partial discharge fault criterion.
Preferably, the determining a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity according to the acquired first GIS pulse current partial discharge signal, second GIS pulse current partial discharge signal, first GIS ultrahigh frequency partial discharge signal and second GIS ultrahigh frequency partial discharge signal respectively includes:
and respectively determining the maximum absolute value of the first GIS pulse current partial discharge signal, the second GIS pulse current partial discharge signal, the first GIS ultrahigh frequency partial discharge signal and the second GIS ultrahigh frequency partial discharge signal as a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity.
Preferably, the preset partial discharge fault criterion includes:
if A is larger than B and A is larger than or equal to a first preset threshold, determining that the GIS has an obvious partial discharge defect;
if A is larger than B, A is larger than a second preset threshold value, and A is smaller than or equal to a first preset threshold value, determining that the GIS has a slight partial discharge defect;
if A is equal to B, C is larger than D, and A is larger than or equal to a first preset threshold, determining that the GIS has an obvious partial discharge defect;
if A is equal to B, C is larger than D, A is larger than a second preset threshold value, and A is smaller than or equal to a first preset threshold value, determining that the GIS has a slight partial discharge defect;
and otherwise, determining that the GIS is in a normal state.
Wherein A is a first local characteristic quantity; b is a second partial discharge characteristic quantity; c is a third partial discharge characteristic quantity; d is a fourth partial discharge characteristic amount.
Preferably, wherein the first preset threshold is 5pC; the second preset threshold is 2pC.
The invention provides a GIS partial discharge signal measuring system which can synchronously and respectively acquire pulse current partial discharge signals and ultrahigh frequency partial discharge signals inside and outside a metal shielding box of a GIS. Based on the GIS partial discharge signal measurement system, the invention provides a GIS partial discharge fault diagnosis method, which determines the GIS partial discharge fault according to the obtained partial discharge signal and a preset partial discharge fault criterion. The invention adopts the suspension shielding measurement, so that the external interference can be effectively inhibited, and the measured pulse current partial discharge signal and the ultrahigh frequency partial discharge signal are more accurate; the characteristic values of the pulse current partial discharge signal and the ultrahigh frequency partial discharge signal are used as the basis for judging whether the GIS has the partial discharge defect, so that the method has the advantages of strong field operability, accurate judgment, sensitive response, quantitative judgment, easiness in implementation and the like, and can be widely applied to diagnosis of the GIS partial discharge fault.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic structural diagram of a GIS partial discharge signal measurement system 100 according to an embodiment of the present invention;
fig. 2 is a flow chart of a GIS partial discharge fault diagnosis method 200 according to an embodiment of the present invention;
fig. 3 is an exemplary diagram of a GIS partial discharge fault diagnosis method according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The embodiment of the invention provides a GIS partial discharge signal measuring system which can respectively obtain pulse current partial discharge signals and ultrahigh frequency partial discharge signals inside and outside a metal shielding box of a GIS. Based on the GIS partial discharge signal measurement system, the embodiment of the invention provides a GIS partial discharge fault diagnosis method, which determines the GIS partial discharge fault according to the obtained partial discharge signal and the preset partial discharge fault criterion. The invention adopts the suspension shielding measurement, so that the external interference can be effectively inhibited, and the measured pulse current partial discharge signal and the ultrahigh frequency partial discharge signal are more accurate; the characteristic values of the pulse current partial discharge signal and the ultrahigh frequency partial discharge signal are used as the basis for judging whether the GIS has the partial discharge defect, so that the method has the advantages of strong field operability, accurate judgment, sensitive response, quantitative judgment, easiness in implementation and the like, and can be widely applied to diagnosis of the GIS partial discharge fault.
Fig. 1 is a schematic structural diagram of a GIS partial discharge signal measurement system 100 according to an embodiment of the present invention. As shown in fig. 1, a GIS partial discharge signal measurement system 100 according to an embodiment of the present invention includes: the device comprises a voltage source 101, a transition unit 102, a Gas Insulated Switchgear (GIS) 103, a metal shielding box 104 arranged outside the GIS, a first GIS pulse current partial discharge measurement unit 105, a second GIS pulse current partial discharge measurement unit 106, a first GIS ultrahigh frequency partial discharge measurement unit 107 and a second GIS ultrahigh frequency partial discharge measurement unit 108 which are connected in sequence; the metal shielding box is respectively connected with the transition unit and the ground end; the transition unit is used for communicating the voltage source with a high-voltage conductor of the GIS, and the voltage source is hermetically connected with a housing of the GIS.
Preferably, the first GIS pulse current partial discharge measurement unit 105 is installed between the GIS and the metal shielding box, and is configured to acquire a first GIS pulse current partial discharge signal.
Preferably, the second GIS pulse current partial discharge measurement unit 106 is installed at a power distribution capacitor of the voltage source, and is configured to acquire a second GIS pulse current partial discharge signal.
Preferably, the first GIS ultrahigh frequency partial discharge measurement unit 107 is installed between the GIS and the metal shielding box, and is configured to acquire a first GIS ultrahigh frequency partial discharge signal.
Preferably, the second GIS ultrahigh frequency partial discharge measurement unit 108 is installed outside the metal shielding box, and is configured to acquire a second GIS ultrahigh frequency partial discharge signal.
Preferably, the GIS is placed on an insulation sleeper, and the housing of the GIS is insulated and isolated from the ground.
Preferably, the transition unit is connected with the GIS through an epoxy insulation flange and a metal bolt with an insulation sheath, so that the transition unit is insulated and isolated from the GIS shell, and the GIS shell potential suspension is realized.
Preferably, wherein the voltage source comprises: the power supply and the armored transformer are connected with the transition unit.
In an embodiment of the invention, a GIS partial discharge signal measurement system includes: the device comprises a power supply, an armored transformer, a transition unit, a GIS, a metal shielding box, a first GIS pulse current partial discharge measurement unit, a second GIS pulse current partial discharge measurement unit, a first GIS ultrahigh frequency partial discharge measurement unit and a second GIS ultrahigh frequency partial discharge measurement unit. The GIS is placed on an insulation sleeper, and the shell is insulated and isolated from the ground; connecting the GIS with an experimental power supply through a transition unit, wherein one end of the transition unit is connected with an armored experimental transformer, and the other end of the transition unit is connected with the GIS; the transition unit is connected with the GIS through an epoxy insulation flange and a metal bolt with an insulation sheath, so that the transition unit is insulated and isolated from the GIS shell, and potential suspension of the GIS shell is realized; installing a metal shielding box outside the GIS, connecting the metal shielding box with the transition unit shell and the ground, insulating the metal shielding box from the GIS, and shielding the GIS through the metal shielding box; a first GIS pulse current partial discharge measurement unit is arranged between the GIS and the metal shielding box and used for measuring a first GIS pulse current partial discharge signal P1; a second GIS pulse current partial discharge measurement unit is arranged at the position of the experimental power supply matching capacitor and used for synchronously measuring a second GIS pulse current partial discharge signal P2; the device comprises a shielding box, a first GIS ultrahigh frequency partial discharge measuring unit, a second GIS ultrahigh frequency partial discharge measuring unit and a second GIS ultrahigh frequency partial discharge measuring unit, wherein the first GIS ultrahigh frequency partial discharge measuring unit is used for mounting the first GIS ultrahigh frequency partial discharge measuring unit in the shielding box, and the second GIS ultrahigh frequency partial discharge measuring unit is used for synchronously measuring the second GIS ultrahigh frequency partial discharge signal U2 outside the shielding box. The transition unit is a switching cavity body and is used for connecting the experiment power supply and the GIS, communicating the experiment power supply with a high-voltage conductor of the GIS and realizing the sealed connection of the power supply and a housing of the GIS.
Fig. 2 is a flowchart of a GIS partial discharge fault diagnosis method 200 according to an embodiment of the present invention. As shown in fig. 2, in the GIS partial discharge fault diagnosis method 100 according to the embodiment of the present invention, starting from step 201, a first GIS pulse current partial discharge signal, a second GIS pulse current partial discharge signal, a first GIS uhf partial discharge signal, and a second GIS uhf partial discharge signal of a preset time period are synchronously obtained in step 201.
In the embodiment of the invention, a first GIS pulse current partial discharge signal, a second GIS pulse current partial discharge signal, a first GIS ultrahigh frequency partial discharge signal and a second GIS ultrahigh frequency partial discharge signal in a preset time period are synchronously acquired; the preset time period is set according to requirements. The system for acquiring the above four signals corresponds to the GIS partial discharge signal measurement system 100 provided in the embodiment of the present invention, and is not described herein again.
In step 202, a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity are respectively determined according to the acquired first GIS pulse current partial discharge signal, the acquired second GIS pulse current partial discharge signal, the acquired first GIS ultrahigh frequency partial discharge signal and the acquired second GIS ultrahigh frequency partial discharge signal.
Preferably, the determining a first local discharge characteristic quantity, a second local discharge characteristic quantity, a third local discharge characteristic quantity and a fourth local discharge characteristic quantity according to the obtained first GIS pulse current partial discharge signal, the obtained second GIS pulse current partial discharge signal, the obtained first GIS ultrahigh frequency partial discharge signal and the obtained second GIS ultrahigh frequency partial discharge signal respectively includes:
and respectively determining the maximum absolute value of the first GIS pulse current partial discharge signal, the second GIS pulse current partial discharge signal, the first GIS ultrahigh frequency partial discharge signal and the second GIS ultrahigh frequency partial discharge signal as a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity.
In an embodiment of the present invention, a method of determining the feature amount is: a = max (abs (P1 (n)); B = max (abs (P2 (n)), C = max (abs (U1 (n)), D = max (abs (U2 (n)), wherein P1, P2, U1 and U2 are respectively a first GIS pulse current partial discharge signal, a second GIS pulse current partial discharge signal, a first GIS ultrahigh frequency partial discharge signal and a second GIS ultrahigh frequency partial discharge signal, A, B, C and D are respectively a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity, the unit of P1 and P2 is pC (Pikura) which is a unit of discharge quantity, the unit of U1 and U2 is voltage (V), and n is the number of discharge signals.
In step 203, a partial discharge fault of the GIS is determined according to a preset partial discharge fault criterion and according to the first partial discharge characteristic quantity, the second partial discharge characteristic quantity, the third partial discharge characteristic quantity and the fourth partial discharge characteristic quantity.
Preferably, the preset partial discharge fault criterion includes:
if A is larger than B and A is larger than or equal to a first preset threshold, determining that the GIS has an obvious partial discharge defect;
if A is larger than B, A is larger than a second preset threshold value, and A is smaller than or equal to a first preset threshold value, determining that the GIS has a slight partial discharge defect;
if A is equal to B, C is larger than D, and A is larger than or equal to a first preset threshold value, determining that the GIS has an obvious partial discharge defect;
if A is equal to B, C is larger than D, A is larger than a second preset threshold value, and A is smaller than or equal to a first preset threshold value, determining that the GIS has a slight partial discharge defect;
and otherwise, determining that the GIS is in a normal state.
Wherein A is a first local characteristic quantity; b is a second partial discharge characteristic quantity; c is a third partial discharge characteristic quantity; d is a fourth partial discharge characteristic amount.
Preferably, wherein the first preset threshold is 5pC; the second preset threshold is 2pC.
In an embodiment of the present invention, the first preset threshold is set to 5pC; the second preset threshold is 2pC. And judging whether the GIS has the partial discharge fault according to the sizes of the A, the B, the C and the D and a preset partial discharge fault criterion. If A is larger than B and A is larger than or equal to 5, the GIS has obvious partial discharge defects; if A is larger than B and A is larger than 2pC and is less than or equal to 5, the GIS has a slight partial discharge defect; if A is equal to B, C is larger than D, and A is larger than or equal to 5, the GIS has obvious partial discharge defect; if A is equal to B, C is larger than D, and A is larger than 2pC and is smaller than or equal to 5, the GIS has a slight partial discharge defect; and the other conditions indicate that the GIS is normal.
Fig. 3 is an exemplary diagram of a GIS partial discharge fault diagnosis method according to an embodiment of the present invention. As shown in fig. 3, the method for diagnosing the partial discharge fault of the GIS includes the following steps:
1) After GIS production is finished, the GIS is placed on an insulation sleeper, and a shell is insulated and isolated from the ground;
2) Connecting the GIS with an experimental power supply through a transition unit, wherein one end of the transition unit is connected with an armored experimental transformer, and the other end of the transition unit is connected with the GIS;
3) The transition unit is connected with the GIS through an epoxy insulation flange and a metal bolt with an insulation sheath, so that the transition unit is insulated and isolated from the GIS shell, and potential suspension of the GIS shell is realized;
4) Installing a metal shielding box outside the GIS, wherein the metal shielding box is connected with the transition unit shell and the ground and insulated from the GIS, and shielding the GIS through the metal shielding box;
5) A pulse current measuring unit 1 is arranged between the GIS and the metal shielding box, and GIS pulse current partial discharge signal data P1 (n) are measured;
6) A pulse current measuring unit 2 is installed at the position of the experimental power supply matching capacitor, and GIS pulse current partial discharge signals P2 (n) are synchronously measured;
7) An ultrahigh frequency partial discharge measurement unit 1 is arranged in a shielding box, and GIS ultrahigh frequency partial discharge signals U1 (n) are synchronously measured;
8) An ultrahigh frequency partial discharge measurement unit 2 is arranged outside the shielding box, and GIS ultrahigh frequency partial discharge signals U2 (n) are synchronously measured;
9) According to the partial discharge characteristic quantities A, B, C and D calculated by the signals P1 (n), P2 (n), U1 (n) and U2 (n), the calculation method comprises the following steps:
A＝max(abs(P1(n))；
B＝max(abs(P2(n))；
C＝max(abs(U1(n))；
D＝max(abs(U2(n))；
10 According to the sizes of A, B, C and D, comparing with a preset partial discharge fault criterion, and judging whether the GIS has a partial discharge fault. If A is larger than B and A is larger than or equal to 5, the GIS has obvious partial discharge defect; if A is larger than B and A is larger than 2pC and is less than or equal to 5, the GIS has a slight partial discharge defect; if A is equal to B, C is larger than D, and A is larger than or equal to 5, the GIS has obvious partial discharge defect; if A is equal to B, C is larger than D, and A is larger than 2pC and is smaller than or equal to 5, the GIS has a slight partial discharge defect; otherwise, the GIS is normal.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A GIS partial discharge signal measurement system, the system comprising: the gas insulated switchgear GIS comprises a voltage source, a transition unit, a gas insulated switchgear GIS and a metal shielding box, wherein the voltage source, the transition unit and the gas insulated switchgear GIS are connected in sequence; the metal shielding box is respectively connected with the transition unit and the ground end; the transition unit is used for communicating the voltage source with a high-voltage conductor of the GIS to realize the sealed connection of the voltage source and the housing of the GIS;
the measurement system further comprises:
the first GIS pulse current partial discharge measurement unit is arranged between the GIS and the metal shielding box and used for acquiring a first GIS pulse current partial discharge signal;
the second GIS pulse current partial discharge measuring unit is arranged at the power distribution capacitor of the voltage source and used for acquiring a second GIS pulse current partial discharge signal;
the first GIS ultrahigh frequency partial discharge measurement unit is arranged between the GIS and the metal shielding box and used for acquiring a first GIS ultrahigh frequency partial discharge signal;
the second GIS ultrahigh frequency partial discharge measurement unit is arranged outside the metal shielding box and used for acquiring a second GIS ultrahigh frequency partial discharge signal;
the transition unit is connected with the GIS through an epoxy insulation flange and a metal bolt with an insulation sheath, so that the transition unit is insulated and isolated from the GIS shell, and the GIS shell potential suspension is realized.
2. The system of claim 1 wherein the GIS is placed on insulation sleepers, the GIS housing being insulated from the earth ground.
3. The system of claim 1, wherein the voltage source comprises: the power supply and the armored transformer are connected with the transition unit.
4. A GIS partial discharge fault diagnosis method based on the system according to any one of claims 1 to 3, characterized in that the method comprises:
synchronously acquiring a first GIS pulse current partial discharge signal, a second GIS pulse current partial discharge signal, a first GIS ultrahigh frequency partial discharge signal and a second GIS ultrahigh frequency partial discharge signal of a preset time period;
respectively determining a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity according to the acquired first GIS pulse current partial discharge signal, the acquired second GIS pulse current partial discharge signal, the acquired first GIS ultrahigh frequency partial discharge signal and the acquired second GIS ultrahigh frequency partial discharge signal;
and determining the partial discharge fault of the GIS according to a preset partial discharge fault criterion according to the first partial discharge characteristic quantity, the second partial discharge characteristic quantity, the third partial discharge characteristic quantity and the fourth partial discharge characteristic quantity.
5. The method according to claim 4, wherein the determining a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity according to the acquired first GIS pulse current partial discharge signal, second GIS pulse current partial discharge signal, first GIS ultrahigh frequency partial discharge signal and second GIS ultrahigh frequency partial discharge signal respectively comprises:
and respectively determining the maximum absolute value of the first GIS pulse current partial discharge signal, the second GIS pulse current partial discharge signal, the first GIS ultrahigh frequency partial discharge signal and the second GIS ultrahigh frequency partial discharge signal as a first partial discharge characteristic quantity, a second partial discharge characteristic quantity, a third partial discharge characteristic quantity and a fourth partial discharge characteristic quantity.
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