CN114167220A - GIL equipment fault positioning system and method for connecting with cable - Google Patents
GIL equipment fault positioning system and method for connecting with cable Download PDFInfo
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- CN114167220A CN114167220A CN202111507975.XA CN202111507975A CN114167220A CN 114167220 A CN114167220 A CN 114167220A CN 202111507975 A CN202111507975 A CN 202111507975A CN 114167220 A CN114167220 A CN 114167220A
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- 238000000034 method Methods 0.000 title claims description 15
- 230000001052 transient effect Effects 0.000 claims abstract description 93
- 238000012544 monitoring process Methods 0.000 claims abstract description 35
- 230000015556 catabolic process Effects 0.000 claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000008439 repair process Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 238000009421 internal insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The system comprises a transient current sensor, a monitoring terminal and an upper control module, wherein the transient current sensor and the monitoring terminal are respectively used for sensing and monitoring the transient current at a shielding grounding wire outside a cable terminal connected with the GIL equipment; and the upper control module is used for analyzing the transient current, extracting the characteristic moment of the transient current waveform, and positioning the insulation breakdown fault inside the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL. The invention can realize the quick and accurate positioning of the high-voltage GIL equipment, is convenient and fast to install, is beneficial to shortening the first-aid repair time of the GIL fault and improving the treatment efficiency of the GIL fault.
Description
Technical Field
The invention belongs to the technical field of electrical equipment detection, and relates to a GIL equipment fault positioning system and method for connecting with a cable.
Background
The gas-insulated transmission lines (GIL) are coaxial arranged, are high-voltage and high-current power transmission equipment insulated by high-pressure gas such as SF6 and SF6 mixed gas, and are widely applied to electric energy sending occasions of large hydropower stations and nuclear power stations.
The GIL equipment has low unit loss, large transmission capacity, high operation reliability, small environmental influence and land occupation saving. During operation of high voltage GIL equipment, insulation breakdown failures are often caused due to manufacturing or installation process defects. Once insulation breakdown occurs in the high-voltage GIL, a power transmission channel is blocked, and power output of a power station is influenced.
In order to reduce the influence of power failure, the breakdown position needs to be quickly and accurately positioned after the high-voltage GIL equipment has insulation breakdown fault. Because the GIL equipment is totally closed, the fault position is inconvenient to be quickly positioned. And the GIL is longer, the number of gas chambers is more, the time needed for positioning the fault gas chamber by adopting the conventional gas decomposition product is longer, and the sensitivity is poorer. Therefore, there is an urgent need to develop a fast and accurate positioning method for high voltage GIL devices.
GIL equipment is mostly connected with overhead lines through sleeves, wave impedance is increased, and a typical traveling wave process can be formed in a GIL pipeline. However, in some piping lane scenarios, the GIL device may also be coupled to a high voltage cable, the wave impedance of which becomes small, and significant transient processes will occur at the junction of the GIL and the cable, especially at the ground line of the outer shielding of the cable termination.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a GIL equipment fault positioning system and method for connecting with a cable, which can realize the quick and accurate positioning of high-voltage GIL equipment, are convenient to install, are beneficial to shortening the GIL fault first-aid repair time and improving the GIL fault processing efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a GIL equipment fault positioning system for being connected with a cable comprises a transient current sensor, a monitoring terminal and an upper control module;
the transient current sensor and the monitoring terminal are respectively used for sensing and monitoring the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
and the upper control module is used for analyzing the transient current, extracting the characteristic moment of the transient current waveform, and positioning the insulation breakdown fault inside the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
The invention further comprises the following preferred embodiments:
preferably, the transient current sensor is arranged at a cable terminal external shielding grounding bar connected with the GIL device and is used for transient current sensing based on a core-through high-frequency electromagnetic coupling principle.
Preferably, the transient current sensor is mounted in an open clamp manner.
Preferably, the transient current sensor is an ultrahigh frequency transient current sensor, the iron core is made of alloy ferromagnetic materials, transient current signals in a frequency band range of 30MHz to 250MHz are sensed, the average equivalent impedance is larger than 30 ohms, and an inner diameter opening is not smaller than 50 mm.
Preferably, the transient current sensor is connected with the monitoring terminal through a coaxial cable.
Preferably, the monitoring terminal comprises an acquisition unit, a power module and a deep isolation transformer which are all arranged in a shielding box made of stainless steel;
the monitoring terminal acquires an alternating current power supply from the local power supply unit, transforms the voltage after passing through the deep isolation transformer, and converts the voltage into a direct current power supply by the power supply module to supply power to the acquisition unit;
the acquisition unit monitors and samples transient current generated at a shielding ground wire of a cable terminal when insulation breakdown accidents occur during the operation of the GIL equipment.
Preferably, the sampling rate of the acquisition unit is 500MS/s, the sampling analog bandwidth is 250MHz, and a FIFO mode of continuous acquisition and storage is adopted.
Preferably, the acquisition unit adopts a gradient triggering mode, once the mutation amount of the current waveform within 12us reaches more than 1kA, the insulation breakdown accident is considered to occur, and the acquisition card is triggered immediately for long-term recording.
Preferably, the monitoring terminal is directly connected with the transient current sensor through an N-type cable transition head arranged on the surface of the shielding box.
Preferably, the upper control module comprises an optical switch and a control host, and is arranged in a screen cabinet in a substation relay protection room;
the optical switch is connected with the monitoring terminal through a single mode fiber to acquire transient current data;
and the control host stores and analyzes the transient current data of each measuring point, extracts the characteristic moment of the transient current waveform, and locates the insulation breakdown fault inside the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
Preferably, the control host is obtained by analysisCharacteristic time t of adjacent transient current1And t2Obtaining the propagation time T of the transient current signal from the fault point to the cable terminal according to the formula (1);
and (3) obtaining the distance L between the fault point and the cable terminal according to a formula (2) by combining the propagation speed v of the electromagnetic wave in the GIL, and realizing the positioning of the insulation breakdown fault inside the GIL equipment:
L＝T×v (2)。
the invention also discloses a GIL equipment fault positioning method for connecting with the cable, which comprises the following steps:
step 1: the transient current sensor and the monitoring terminal respectively sense and monitor the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
step 2: and the upper control module analyzes the transient current, extracts the characteristic moment of the transient current waveform, and performs insulation breakdown fault location in the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
The beneficial effect that this application reached:
according to the invention, the feedthrough transient current sensor is additionally arranged at the external shielding ground wire of the cable terminal connected with the GIL equipment, the sampling rate is 500MS/s, and the sampling simulation bandwidth is 250MHz, so that the waveform of the transient current entering the ground is monitored, the online monitoring of the transient process based on the transient current is realized, the accurate positioning of the internal fault of the GIL equipment is realized based on the characteristic moment of the transient current waveform and the propagation speed of electromagnetic waves in the GIL, the installation is convenient and fast, the GIL fault first-aid repair time is favorably shortened, and the GIL fault processing efficiency is improved.
The transient current sensor adopted by the invention has a sensing frequency band far higher than that of the currently adopted sensor, and the anti-interference capability of the monitoring system can be effectively improved. Meanwhile, the sampling rate and the simulation bandwidth of the monitoring system provided by the invention are far higher than those of the existing monitoring system, and the time resolution of the transient current waveform can be obviously improved, so that the characteristic moment extraction effect is improved, and the GIL fault positioning accuracy is effectively improved.
Drawings
FIG. 1 is a block diagram of a GIL facility fault location system for connection to a cable in accordance with the present invention;
FIG. 2 is a graph of equivalent impedance of a high frequency transient current sensor according to an embodiment of the present invention;
fig. 3 is a transient current waveform at the outer shielded ground of a cable termination connected to a GIL device at the time of an insulation fault in an embodiment of the invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, a fault location system for a GIL device connected to a cable according to the present invention includes a transient current sensor, a monitoring terminal, and an upper control module;
the transient current sensor and the monitoring terminal are respectively used for sensing and monitoring the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
in specific implementation, the transient current sensor is arranged at a cable terminal external shielding grounding bar connected with the GIL equipment and is used for transient current sensing based on a core-through high-frequency electromagnetic coupling principle.
The transient current sensor is installed in an open clamp mode, and is convenient and fast.
The transient current sensor is an ultrahigh frequency transient current sensor, an iron core is made of alloy ferromagnetic materials, transient current signals in a frequency band range of 30MHz to 250MHz can be well sensed, the average equivalent impedance is larger than 30 ohms, an equivalent impedance curve is shown in figure 2, and an inner diameter opening of the transient current sensor is not smaller than 50 mm.
The transient current sensor is connected with the monitoring terminal through a high-frequency coaxial cable.
In specific implementation, the monitoring terminal comprises an acquisition unit, a power supply module and a deep isolation transformer which are all arranged in a shielding box made of stainless steel;
the monitoring terminal acquires a 220V alternating current power supply from the local power supply unit, transforms the voltage after customizing the deep isolation transformer, and converts the voltage into a direct current power supply by the power supply module to supply power to the acquisition unit;
furthermore, the input voltage range of the acquisition unit is-5V.
The local power supply unit can get power from a 220V power supply nearby a GIL site, at least has 3-path output capacity, and the power supply power is not lower than 90W.
The acquisition unit monitors and samples high-frequency transient current generated at a shielding ground wire of a cable terminal when an insulation breakdown accident occurs during the operation of the high-voltage GIL equipment.
The sampling rate of the acquisition unit is 500MS/s, the sampling analog bandwidth is 250MHz, and a FIFO mode of continuous acquisition and storage is adopted.
The acquisition unit adopts a gradient triggering mode, and once the mutation amount of the current waveform within 12us reaches more than 1kA, the acquisition card is immediately triggered to record for a long time after an insulation breakdown accident is considered to occur.
And the monitoring terminal is directly connected with the transient current sensor through an N-type cable transition head arranged on the surface of the shielding box.
And the upper control module is used for analyzing the transient current, extracting the characteristic moment of the transient current waveform, and positioning the insulation breakdown fault inside the high-voltage GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
In specific implementation, the upper control module comprises an optical switch, a control host (server), a display, a keyboard and other equipment, and can be arranged in a screen cabinet in a relay protection room of a transformer substation;
the optical switch is connected with the monitoring terminal through a single mode fiber to acquire transient current data;
and the control host stores and analyzes the transient current data of each measuring point. When the transient current values at a certain moment are all smaller than or larger than the current values within 50ns before and after the moment, and the absolute value of the amplitude is not lower than 20% of the maximum value of the absolute value of the transient current, the moment is called as the characteristic moment of the transient current. By using the method to extract the characteristic moment of the transient current waveform, as shown in fig. 3, the internal insulation breakdown fault location of the high-voltage GIL equipment is carried out by combining the propagation speed of electromagnetic waves in the GIL, specifically:
analyzing to obtain the adjacent characteristic time t of the transient current1And t2Obtaining the propagation time T of the transient current signal from the fault point to the cable terminal according to the formula (1);
further, in combination with the propagation velocity v of the electromagnetic wave in the GIL, when the method is implemented specifically, v can be 294m/us, the distance L between the fault point and the cable terminal is obtained according to the formula (2), and the positioning of the insulation breakdown fault inside the high-voltage GIL equipment is realized:
L＝T×v (2)。
the invention discloses a GIL equipment fault positioning method for connecting with a cable, which comprises the following steps:
step 1: the transient current sensor and the monitoring terminal respectively sense and monitor the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
step 2: and the upper control module analyzes the transient current, extracts the characteristic moment of the transient current waveform, and performs insulation breakdown fault location in the high-voltage GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
According to the invention, the feedthrough transient current sensor is additionally arranged at the external shielding ground wire of the cable terminal connected with the GIL equipment, the sampling rate is 500MS/s, and the acquisition unit with the sampling simulation bandwidth of 250MHz is used for monitoring the waveform of the transient current entering the ground, so that the online monitoring of the transient process based on the transient current is realized, the accurate positioning of the internal fault of the GIL equipment is realized based on the characteristic moment of the transient current waveform and the propagation speed of electromagnetic waves in the GIL, the rapid and accurate positioning of the high-voltage GIL equipment can be realized, the installation is convenient, the shortening of the emergency repair time of the GIL fault is facilitated, and the GIL fault processing efficiency is improved.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (12)
1. The utility model provides a GIL equipment fault location system for with cable junction, includes transient current sensor, monitor terminal and upper control module, its characterized in that:
the transient current sensor and the monitoring terminal are respectively used for sensing and monitoring the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
and the upper control module is used for analyzing the transient current, extracting the characteristic moment of the transient current waveform, and positioning the insulation breakdown fault inside the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
2. A GIL equipment fault location system for cabling according to claim 1, wherein:
the transient current sensor is arranged at a cable terminal external shielding grounding bar connected with the GIL equipment and is used for sensing transient current based on a core-through high-frequency electromagnetic coupling principle.
3. A GIL equipment fault location system for cabling according to claim 1, wherein:
the transient current sensor is installed in an open clamp mode.
4. A GIL equipment fault location system for cabling according to claim 1, wherein:
the transient current sensor is an ultrahigh frequency transient current sensor, an iron core is made of alloy ferromagnetic materials, transient current signals in a frequency band range of 30MHz to 250MHz are sensed, the average equivalent impedance is larger than 30 ohms, and an inner diameter opening is not smaller than 50 mm.
5. A GIL equipment fault location system for cabling according to claim 1, wherein:
the transient current sensor is connected with the monitoring terminal through a coaxial cable.
6. A GIL equipment fault location system for cabling according to claim 1, wherein:
the monitoring terminal comprises an acquisition unit, a power supply module and a deep isolation transformer which are all arranged in a shielding box made of stainless steel;
the monitoring terminal acquires an alternating current power supply from the local power supply unit, transforms the voltage after passing through the deep isolation transformer, and converts the voltage into a direct current power supply by the power supply module to supply power to the acquisition unit;
the acquisition unit monitors and samples transient current generated at a shielding ground wire of a cable terminal when insulation breakdown accidents occur during the operation of the GIL equipment.
7. The GIL facility fault location system for cabling according to claim 6, wherein:
the sampling rate of the acquisition unit is 500MS/s, the sampling analog bandwidth is 250MHz, and a FIFO mode of continuous acquisition and storage is adopted.
8. The GIL facility fault location system for cabling according to claim 6, wherein:
the acquisition unit adopts a gradient triggering mode, and once the mutation amount of the current waveform within 12us reaches more than 1kA, the acquisition card is immediately triggered to record for a long time after an insulation breakdown accident is considered to occur.
9. A GIL equipment fault location system for cabling according to claim 1, wherein:
and the monitoring terminal is directly connected with the transient current sensor through an N-type cable transition head arranged on the surface of the shielding box.
10. A GIL equipment fault location system for cabling according to claim 1, wherein:
the upper control module comprises an optical switch and a control host and is arranged in a screen cabinet in a relay protection room of the transformer substation;
the optical switch is connected with the monitoring terminal through a single mode fiber to acquire transient current data;
and the control host stores and analyzes the transient current data of each measuring point, extracts the characteristic moment of the transient current waveform, and locates the insulation breakdown fault inside the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
11. A GIL equipment fault location system for connection with cables as claimed in claim 10 wherein:
the control host obtains the adjacent characteristic time t of the transient current through analysis1And t2Obtaining the propagation time T of the transient current signal from the fault point to the cable terminal according to the formula (1);
and (3) obtaining the distance L between the fault point and the cable terminal according to a formula (2) by combining the propagation speed v of the electromagnetic wave in the GIL, and realizing the positioning of the insulation breakdown fault inside the GIL equipment:
L＝T×v (2)。
12. a GIL equipment fault location method for cable connection based on GIL equipment fault location system for cable connection according to any of claims 1 to 11, characterized by:
the method comprises the following steps:
step 1: the transient current sensor and the monitoring terminal respectively sense and monitor the transient current at the external shielding grounding wire of the cable terminal connected with the GIL equipment;
step 2: and the upper control module analyzes the transient current, extracts the characteristic moment of the transient current waveform, and performs insulation breakdown fault location in the GIL equipment by combining the propagation speed of the electromagnetic wave in the GIL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111507975.XA CN114167220A (en) | 2021-12-10 | 2021-12-10 | GIL equipment fault positioning system and method for connecting with cable |
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| CN202111507975.XA CN114167220A (en) | 2021-12-10 | 2021-12-10 | GIL equipment fault positioning system and method for connecting with cable |
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| CN114167220A true CN114167220A (en) | 2022-03-11 |
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2021
- 2021-12-10 CN CN202111507975.XA patent/CN114167220A/en active Pending
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