CN110579689A - Device and method for accurately positioning fault of high-voltage GIL equipment - Google Patents
Device and method for accurately positioning fault of high-voltage GIL equipment Download PDFInfo
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- CN110579689A CN110579689A CN201910972415.8A CN201910972415A CN110579689A CN 110579689 A CN110579689 A CN 110579689A CN 201910972415 A CN201910972415 A CN 201910972415A CN 110579689 A CN110579689 A CN 110579689A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001052 transient effect Effects 0.000 claims abstract description 172
- 238000012544 monitoring process Methods 0.000 claims abstract description 142
- 238000005070 sampling Methods 0.000 claims description 30
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- 230000005540 biological transmission Effects 0.000 abstract description 19
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- 229920006362 Teflon® Polymers 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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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
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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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Abstract
The embodiment of the invention provides a device and a method for accurately positioning faults of high-voltage GIL equipment, and relates to the technical field of electrical equipment. According to the device and the method for accurately positioning the fault of the high-voltage GIL equipment, which are provided by the embodiment of the invention, the monitoring units are arranged at the two ends of the GIL equipment, the transient voltage when the GIL equipment is in fault is monitored, and the time when the transient voltage reaches the monitoring units is recorded, so that the time delay of the transient voltage transmitted to the monitoring units at the two ends of the GIL equipment is obtained, and the quick positioning of the fault occurrence position of the GIL equipment can be realized according to the time delay of the transient voltage transmission and the transmission speed of the transient voltage in the GIL equipment.
Description
Technical Field
the invention relates to the technical field of electrical equipment, in particular to a fault accurate positioning device and method for high-voltage GIL equipment.
Background
Gas-insulated transmission lines (GIL) are high-voltage and high-current power transmission equipment which adopts high-voltage gas (such as mixed gas of SF6 and SF 6) for insulation and coaxial arrangement of a metal shell and a conductor. Compared with the traditional overhead line, the GIL equipment has the advantages of large transmission capacity, low unit loss, small environmental influence, high operation reliability and land occupation saving, and is widely applied to electric energy sending-out occasions of large hydropower stations and nuclear power stations.
in the operation process of the high-voltage GIL equipment, insulation breakdown faults are often caused due to defects of production processes and poor control of the installation process. Once insulation breakdown accident happens to the high-voltage GIL equipment, a power transmission channel is blocked, and power output of a power station and safety and stability of a large power grid are affected. After the high-voltage GIL equipment has an insulation breakdown fault, the breakdown position needs to be quickly and accurately positioned to reduce the influence of power failure, so that how to quickly and accurately position the fault position of the high-voltage GIL equipment is a problem which needs to be solved at present.
Disclosure of Invention
based on the research, the invention provides a device and a method for accurately positioning the fault of the high-voltage GIL equipment.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a device for accurately positioning a fault of a high-voltage GIL apparatus, including a control unit and two monitoring units; the control unit is connected with each monitoring unit, and each monitoring unit is respectively arranged at two ends of the GIL equipment;
each monitoring unit is used for monitoring the transient voltage when the GIL equipment fails, recording the time when the transient voltage reaches the monitoring unit, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring unit to the control unit;
The control unit is used for storing the transient voltage, obtaining the time delay of the transient voltage according to the time when the transient voltage reaches each monitoring unit, and positioning the fault occurrence position according to the time delay.
in an optional embodiment, the monitoring unit comprises a voltage sensor and a monitoring terminal; the voltage sensor is arranged in the gas chamber of the GIL equipment and is electrically connected with the monitoring terminal, and the monitoring terminal is connected with the control unit;
The voltage sensor is used for monitoring the transient voltage when the GIL equipment fails and transmitting the transient voltage when the GIL equipment fails to the monitoring terminal;
the monitoring terminal is used for recording the transient voltage, recording the time when the transient voltage reaches the monitoring terminal, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring terminal to the control unit.
In an alternative embodiment, the voltage sensor includes a bus bar, a plenum housing, a hand hole, an inductive electrode, and a hand hole cover plate;
the bus is arranged in the air chamber, the hand hole is arranged in the air chamber shell, the induction electrode is arranged in the hand hole, and the hand hole cover plate covers the hand hole;
The monitoring terminal is electrically connected with the hand hole cover plate and used for recording the transient voltage of the induction electrode relative to the hand hole cover plate.
In an optional embodiment, the voltage sensor further includes a connector, the connector is disposed on the hand hole cover plate and electrically connected to the sensing electrode and the monitoring terminal, respectively, and the connector is configured to transmit the transient voltage of the sensing electrode relative to the hand hole cover plate to the monitoring terminal.
In an alternative embodiment, the voltage sensor further includes an insulating film disposed between the sensing electrode and the hand hole cover plate.
In an optional embodiment, the monitoring terminal comprises a sampling unit and a GPS module;
the GPS module is electrically connected with the sampling unit and used for recording the moment when the transient voltage reaches the monitoring terminal;
The sampling unit is respectively connected with the voltage sensor and the control unit and is used for recording the transient voltage of the GIL equipment when the GIL equipment fails, which is monitored by the voltage sensor, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring terminal to the control unit.
in an optional embodiment, the monitoring terminal further includes a transformer and a power supply module;
the transformer is respectively electrically connected with an external power supply and the power module and is used for transforming the alternating current power supply provided by the external power supply and then transmitting the transformed alternating current power supply to the power module;
The power module is respectively electrically connected with the sampling unit and the GPS module and is used for converting an alternating current power supply transmitted by the transformer into a direct current power supply and then supplying power to the sampling unit and the GPS module.
In an optional implementation manner, the device for accurately positioning the fault of the high-voltage GIL equipment further comprises a shielding box, wherein the monitoring terminal is arranged in the shielding box, and the shielding box is fixedly arranged outside the air chamber.
In an alternative embodiment, the control unit comprises a switch and a server connected to the switch;
The switch is connected with the monitoring terminals through optical fibers and is used for transmitting the moment when the transient voltage reaches each monitoring terminal and the transient voltage transmitted by each monitoring terminal to the server;
The server is used for storing the transient voltage, judging whether the transient voltage exceeds a preset threshold value, alarming the transient voltage exceeding the preset threshold value, obtaining the time delay of the transient voltage according to the moment when the transient voltage reaches each monitoring terminal, and positioning the fault occurrence position according to the time delay.
In a second aspect, an embodiment of the present invention provides a method for accurately positioning a fault of a high-voltage GIL device, which is applied to the apparatus for accurately positioning a fault of a high-voltage GIL device described in any one of the foregoing embodiments, and the method includes:
Each monitoring unit monitors transient voltage when GIL equipment fails, records the time when the transient voltage reaches the monitoring unit, and transmits the transient voltage and the time when the transient voltage reaches the monitoring unit to a control unit;
the control unit stores the transient voltage, obtains the time delay of the transient voltage according to the time when the transient voltage respectively reaches each monitoring unit, and positions the fault occurrence position according to the time delay.
According to the device and the method for accurately positioning the fault of the high-voltage GIL equipment, which are provided by the embodiment of the invention, the monitoring units are arranged at the two ends of the GIL equipment, the transient voltage when the GIL equipment is in fault is monitored, and the time when the transient voltage reaches the monitoring units is recorded, so that the time delay of the transient voltage transmitted to the monitoring units at the two ends of the GIL equipment is obtained, and the quick positioning of the fault occurrence position of the GIL equipment can be realized according to the time delay of the transient voltage transmission and the transmission speed of the transient voltage in the GIL equipment.
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 embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
fig. 1 is a schematic structural diagram of a device for accurately positioning a fault of a high-voltage GIL apparatus according to an embodiment of the present invention.
Fig. 2 is another schematic structural diagram of the device for accurately positioning the fault of the high-voltage GIL equipment according to the embodiment of the invention.
Fig. 3 is a schematic structural diagram of a voltage sensor according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an apparatus for accurately positioning a fault of a high-voltage GIL device according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart of a method for accurately positioning a fault of a high-voltage GIL device according to an embodiment of the present invention.
Icon: 100-a fault accurate positioning device for high-voltage GIL equipment; 10-a monitoring unit; 11-a voltage sensor; 111-bus bar; 112-a gas chamber housing; 113-hand hole; 114-a sensing electrode; 115-hand hole cover plate; 116 — an insulating film; 117-linker; 12-a monitoring terminal; 121-a sampling unit; 122-a GPS module; 123-a power supply module; 124-a transformer; 125-GPS antenna; 20-a control unit; 21-a switch; 22-server.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Although compared with traditional overhead lines and cables, the high-voltage GIL equipment has many advantages, the troubleshooting time of traditional overhead lines and cables is shorter than that of the high-voltage GIL equipment, most of faults of traditional overhead lines are directly visible, cable fault positions are mostly distributed at joints and terminals, the high-voltage GIL equipment is longer in length and is in a fully closed state, and therefore the fault positions are difficult to locate quickly.
At present, most fault positioning of high-voltage GIL equipment directly adopts a conventional gas decomposition product detection method to position a fault air chamber, and the time cost required for directly adopting the conventional gas decomposition product detection method to position the fault air chamber is too large, so that the method is not practical. Therefore, how to quickly and accurately locate the fault location of the high voltage GIL device is a problem that needs to be solved at present.
Based on the above research, the embodiment of the present invention provides a device for accurately positioning a fault of a high-voltage GIL device, so as to improve the above problems.
Referring to fig. 1, the present embodiment provides a fault pinpointing device 100 for high voltage GIL equipment, wherein the fault pinpointing device 100 for high voltage GIL equipment comprises a control unit 20 and two monitoring units 10; the control unit 20 is connected to each monitoring unit 10, and each monitoring unit 10 is respectively disposed at two ends of the GIL device.
Each of the monitoring units 10 is configured to monitor a transient voltage when the GIL device fails, record a time when the transient voltage reaches the monitoring unit 10, and transmit the transient voltage and the time when the transient voltage reaches the monitoring unit 10 to the control unit 20.
The control unit 20 is configured to store the transient voltage, obtain a time delay of the transient voltage according to a time when the transient voltage reaches each monitoring unit 10, and position a fault occurrence position according to the time delay.
Wherein, each monitoring unit 10 sets up respectively in the both ends of GIL equipment, transient voltage that produces when malfunctioning to GIL equipment monitors, every monitoring unit 10 all records the moment that transient voltage arrived, and transmit transient voltage and the moment that transient voltage arrived to control unit 20, control unit 20 is after receiving transient voltage and the moment that transient voltage arrived each monitoring unit 10, store transient voltage, and reach the moment of each monitoring unit 10 according to transient voltage, calculate the time delay that obtains transient voltage transmission to GIL equipment both ends, according to this time delay, combine the speed of transient voltage transmission in GIL equipment, the speed of transient voltage signal transmission in GIL equipment promptly, can the trouble emergence position fix a position. For example, the monitoring unit a is located at an a-terminal (whose position is known) of the GIL device, the monitoring unit B is located at a B-terminal (whose position is known) of the GIL device, when a certain point c in the GIL device fails, and the transient voltage at the point c is transmitted to the a-terminal, the monitoring unit a records that the arrival time is T1, and when the transient voltage at the point c is transmitted to the B-terminal, the monitoring unit B records that the arrival time is T2, and the time delay of the transient voltage transmitted to both ends of the GIL device is T1-T2, where the speed of the transient voltage transmitted in the GIL device is v, the line length of the GIL device is L, the transmission distance s from the point c to the point a is (L + (T1-T2) × v)/2, and after the distance from the point c to the point a is calculated, the location where the failure occurs can be located, and the speed is fast and accurate.
according to the accurate positioning device 100 for the high-voltage GIL equipment fault, which is provided by the embodiment of the invention, the monitoring units 10 are arranged at the two ends of the GIL equipment, and the time when the transient voltage reaches the monitoring units 10 is recorded, so that the time delay of the transient voltage transmitted to the monitoring units 10 at the two ends of the GIL equipment is obtained, and according to the time delay of the transient voltage transmission, the quick and accurate positioning of the fault occurrence position of the GIL equipment can be realized by combining the transmission speed of the transient voltage in the GIL equipment, so that the important significance is realized for shortening the insulation fault rush-repair time of the GIL equipment, improving the GIL fault processing efficiency and ensuring the power supply reliability.
Referring to fig. 2, in a further embodiment, the monitoring unit 10 includes a voltage sensor 11 and a monitoring terminal 12; the voltage sensor 11 is arranged in the air chamber of the GIL device and is electrically connected with the monitoring terminal 12, and the monitoring terminal 12 is connected with the control unit 20.
The voltage sensor 11 is configured to monitor a transient voltage when the GIL device fails, and transmit the transient voltage when the GIL device fails to the monitoring terminal 12.
The monitoring terminal 12 is configured to record the transient voltage, record a time when the transient voltage reaches the monitoring terminal 12, and transmit the transient voltage and the time when the transient voltage reaches the monitoring terminal 12 to the control unit 20.
The voltage sensor 11 is disposed in an air chamber of the GIL device, monitors a transient voltage of the GIL device, and transmits the monitored transient voltage to the monitoring terminal 12. When the GIL device fails, the voltage sensor 11 transmits the transient voltage generated by the failure to the monitoring terminal 12, the monitoring terminal 12 records the waveform of the transient voltage after receiving the transient voltage generated by the failure, records the time when the transient voltage reaches the monitoring terminal 12, that is, records the time when the transient voltage is transmitted from the failure occurrence position to the monitoring terminal 12, and transmits the recorded transient voltage and the time when the transient voltage reaches the monitoring terminal 12 to the control unit 20.
Optionally, in this embodiment, the effective measurement frequency band of the voltage sensor 11 is 2.1Hz to 230 MHz.
As an alternative embodiment, the voltage sensor 11 provided in this embodiment is a capacitive voltage dividing sensor, and converts the transient voltage of the GIL device into a low voltage to be transmitted to the monitoring terminal 12. Referring to fig. 3, the voltage sensor 11 of the present embodiment includes a bus 111, a gas chamber housing 112, a hand hole 113, an inductive electrode 114, and a hand hole cover plate 115.
The bus 111 is arranged in the air chamber, the hand hole 113 is arranged in the air chamber shell 112, the induction electrode 114 is arranged in the hand hole 113, and the hand hole cover plate 115 covers the hand hole 113.
a high-voltage arm capacitor is formed between the sensing electrode 114 and the bus bar 111, a low-voltage arm capacitor is formed between the sensing electrode 114 and the hand hole cover plate 115, and the monitoring terminal 12 is electrically connected with the hand hole cover plate 115 and is used for recording the transient voltage of the sensing electrode 114 relative to the hand hole cover plate 115.
The capacitance between the sensing electrode 114 and the hand hole cover plate 115 forms a low-voltage arm capacitance, and the stray capacitance between the sensing electrode 114 and the bus 111 forms a high-voltage arm capacitance, so that capacitance voltage division is formed, the transient voltage of the GIL device is subjected to voltage division, and the divided low voltage is transmitted to the monitoring terminal 12, that is, the transient voltage of the sensing electrode 114 relative to the hand hole cover plate 115.
Optionally, in this embodiment, the low-voltage arm capacitance formed by the sensing electrode 114 and the manhole cover 115 is of order nF, and the high-voltage arm capacitance formed by the sensing electrode 114 and the bus 111 is of order 0.001 pF.
Optionally, in this embodiment, the inner diameter of the hand hole 113 disposed in the air chamber housing 112 is 110mm, and the diameter of the sensing electrode 114 is 100 mm.
In a further embodiment, the voltage sensor 11 further includes an insulating film 116, and the insulating film 116 is disposed between the sensing electrode 114 and the hand hole cover 115.
The insulating film 116 is disposed between the sensing electrode 114 and the hand hole cover 115, and serves as an insulating medium between the sensing electrode 114 and the hand hole cover 115. Optionally, in this embodiment, a teflon film is used as an insulating medium between the sensing electrode 114 and the hand hole cover plate 115, and the thickness of the teflon film may be 100 μm.
as an optional embodiment, in order to facilitate the transmission of the voltage, the voltage sensor 11 further includes a connector 117, the connector 117 is disposed on the hand hole cover 115 and electrically connected to the sensing electrode 114 and the monitoring terminal 12, respectively, and the connector 117 is used for transmitting the transient voltage of the sensing electrode 114 relative to the hand hole cover 115 to the monitoring terminal 12.
Wherein, be provided with the cable conductor in the joint 117, be connected with sensing electrode 114, monitor terminal 12 electricity respectively through the cable conductor, and then transmit the transient voltage of sensing electrode 114 for handhole cover plate 115 to monitor terminal 12.
Optionally, the joint 117 provided in this embodiment may be an N-type joint.
In a further embodiment, referring to fig. 4, the monitoring terminal 12 includes a sampling unit 121 and a GPS module 122.
The GPS module 122 is electrically connected to the sampling unit 121, and is configured to record a time when the transient voltage reaches the monitoring terminal 12.
the sampling unit 121 is connected to the voltage sensor 11 and the control unit 20, and configured to record a transient voltage of the GIL device during a fault, which is monitored by the voltage sensor 11, and transmit the transient voltage and a time when the transient voltage reaches the monitoring terminal 12 to the control unit 20.
the sampling unit 121 is electrically connected to the voltage sensor 11 through the connector 117, so as to record the waveform of the transient voltage transmitted by the voltage sensor 11. In this embodiment, the sampling unit 121 has a gradient triggering mode, when the GIL device fails, once the waveform of the transient voltage collected by the sampling unit 121 exceeds a set gradient, the sampling unit 121 is triggered to record for a long time, and record the transient voltage generated due to the failure, and at the same time, the GPS module 122 is used to record the triggering time, so as to record the time when the transient voltage generated due to the failure reaches the monitoring unit 10.
When the waveform of the transient voltage collected by the sampling unit 121 exceeds the set gradient, it indicates that the GIL device has a fault, and the transient voltage generated by the fault is transmitted to the monitoring terminal 12, at this time, the GPS module 122 is used to record the time when the sampling unit 121 is triggered to record for a long time, and then record the time when the transient voltage generated by the fault reaches the monitoring unit 10.
Optionally, in the present embodiment, the time error of the GPS module 122 is less than 20 ns.
As an optional implementation manner, the monitoring terminal 12 provided in this embodiment may further include a GPS antenna 125, the GPS antenna 125 is connected to the GPS module 122, and the GPS module 122 receives a satellite signal through the GPS antenna 125 to record a time when a transient voltage generated by a fault reaches the monitoring unit 10.
Optionally, in this embodiment, the time precision of the GPS module 122 is not less than 20ns, and the model thereof may be selected according to actual needs, for example, the SKG12DT module, the SKG17A, and the like, which is not limited herein.
As an optional implementation manner, the sampling unit 121 provided in this embodiment may be an acquisition card, and has a flexible acquisition triggering mechanism, and supports a FIFO mode of continuous acquisition and storage, where the sampling rate may be 250MS/s, the sampling analog bandwidth may be 100MHz, and the model thereof may be selected according to actual needs, for example, an ATS860 acquisition card, an ATS9625 acquisition card, and the like, which is not limited herein.
As an optional embodiment, the monitoring terminal 12 further includes a transformer 124 and a power module 123.
The transformer 124 is electrically connected to an external power source and the power module 123, and is configured to transform an ac power provided by the external power source and transmit the transformed ac power to the power module 123.
The power module 123 is electrically connected to the sampling unit 121 and the GPS module 122, and is configured to convert an ac power transmitted by the transformer 124 into a dc power and supply power to the sampling unit 121 and the GPS module 122.
The transformer 124 may be connected to an external power supply near the GIL device through a cable, and transforms a 220V ac power provided by the external power supply, and transmits the transformed ac power to the power module 123, and the power module 123 converts the transformed ac power into a dc power to supply power to the sampling unit 121 and the GPS module 122.
As an alternative implementation, the transformer 124 provided in this embodiment may be a deep isolation transformer, and the type of the deep isolation transformer may refer to the prior art, which is not limited herein, and only needs to perform transformation processing on an ac power provided by an external power source.
as an optional implementation manner, the power module 123 provided in this embodiment may be a rectifier, and the type thereof may refer to the prior art, which is not limited herein, and only needs to convert an ac power into a dc power.
In order to facilitate the installation of the monitoring unit 10, the device 100 for accurately positioning the fault of the high-voltage GIL equipment provided by this embodiment may further include a shielding box, wherein the monitoring terminal 12 is disposed in the shielding box, and the shielding box is fixedly disposed outside the air chamber.
the shielding box provided in this embodiment may be made of stainless steel, and the sampling unit 121, the GPS module 122, the transformer 124, and the power module 123 included in the monitoring terminal 12 are all installed in the shielding box.
optionally, the shielding box provided in this embodiment may be fixed outside the air chamber by screws or welding, and a through hole through which the joint 117 can pass is provided on the shielding box, and the through hole is used to electrically connect the monitoring terminal 12 and the voltage sensor 11.
With reference to fig. 4, the control unit 20 provided in the present embodiment includes a switch 21 and a server 22 connected to the switch 21.
The switch 21 is connected to the monitoring terminals 12 through optical fibers, and is configured to transmit the time when the transient voltage reaches each monitoring terminal 12 and the transient voltage transmitted by each monitoring terminal 12 to the server 22.
the server 22 is configured to store the transient voltage, determine whether the transient voltage exceeds a preset threshold, alarm the transient voltage exceeding the preset threshold, obtain a time delay of the transient voltage according to a time when the transient voltage reaches each monitoring terminal 12, and position a fault occurrence location according to the time delay.
The sampling unit 121 is connected to the switch 21 through a single-mode fiber, the switch 21 is connected to the server 22 through an ethernet cable, so that the sampling unit 121 transmits the time when the transient voltage reaches each monitoring terminal 12 and the transient voltage transmitted by each monitoring terminal 12 to the switch 21 through the single-mode fiber, and the switch 21 transmits the time when the transient voltage transmitted by the sampling unit 121 reaches each monitoring terminal 12 and the transient voltage transmitted by each monitoring terminal 12 to the server 22 through the ethernet cable.
after receiving the transient voltage transmitted by the switch 21, the server 22 (control host) stores the transient voltage, extracts a transient voltage amplitude, analyzes a time-frequency characteristic thereof, judges whether the transient voltage exceeds a preset threshold, gives an alarm for the transient voltage exceeding the preset threshold, obtains a time delay of the transient voltage transmitted to both ends of the GIL according to a time when the transient voltage reaches each monitoring terminal 12, and then positions a fault occurrence position according to the time delay and a speed of the transient voltage transmitted in the GIL device.
As an optional implementation manner, after the server 22 alarms the transient voltage exceeding the preset threshold and locates the fault occurrence position, the alarm information and the location information of the fault occurrence position may be sent to the server through the network, so that after receiving the alarm information and the location information, a worker at the server executes corresponding operations according to the location information and the alarm information to maintain the GIL device, optionally, the server provided in this embodiment may be a master control end of the substation.
As an alternative implementation, the switch 21 provided in this embodiment may be a fiber switch, and the model thereof may refer to the prior art, and is not limited herein, and only needs to be capable of implementing data transmission.
As an alternative embodiment, the server 22 provided in this embodiment may be a host with data processing capability, and its model may refer to the prior art, such as DL388 Gen 8E 5-2620, PowerEdge R740, and so on, which is not limited herein, and only needs to implement data processing.
As an optional implementation manner, the control unit 20 provided in this embodiment may further include a display, a keyboard, and other devices, and the control unit 20 provided in this embodiment may be disposed in a screen cabinet in a substation relay protection room.
According to the fault accurate positioning device 100 for the high-voltage GIL equipment, which is provided by the embodiment of the invention, the monitoring units 10 are arranged at the two ends of the GIL equipment, so that the transient voltage when the GIL equipment is in fault is monitored, and the time when the transient voltage reaches the monitoring units 10 is recorded, so that the time delay of the transient voltage transmitted to the monitoring units 10 at the two ends of the GIL equipment is obtained, according to the time delay of the transient voltage transmission, the quick positioning of the fault occurrence position of the GIL equipment can be realized by combining the transmission speed of the transient voltage in the GIL equipment, the fault positioning precision is within 20 meters, the precision is high, and the fault accurate positioning device has great significance for shortening the insulation fault emergency repair time of the GIL equipment, improving the GIL fault processing efficiency and.
On the basis, please refer to fig. 5 in combination, an embodiment of the present invention further provides a method for accurately positioning a fault of a high voltage GIL device, which is applied to the apparatus 100 for accurately positioning a fault of a high voltage GIL device, and the method includes:
Step S10: each monitoring unit 10 monitors the transient voltage when the GIL device fails, records the time when the transient voltage reaches the monitoring unit 10, and transmits the transient voltage and the time when the transient voltage reaches the monitoring unit 10 to the control unit 20.
Step S20: the control unit 20 stores the transient voltage, obtains a time delay of the transient voltage according to the time when the transient voltage reaches each monitoring unit 10, and positions the fault occurrence position according to the time delay.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific implementation process of the method described above may refer to the corresponding process in the foregoing apparatus, and will not be described in detail herein.
In summary, according to the apparatus and method for accurately positioning a fault of a high-voltage GIL device provided by the embodiments of the present invention, the monitoring units are disposed at the two ends of the GIL device, so as to monitor the transient voltage when the GIL device is in fault, and record the time when the transient voltage reaches the monitoring units, so as to obtain the time delay of the transient voltage transmitted to the monitoring units at the two ends of the GIL device, and according to the time delay of the transient voltage transmission, the quick positioning of the fault occurrence position of the GIL device can be realized by combining the transmission speed of the transient voltage in the GIL device, and the accuracy is high.
the above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The device for accurately positioning the fault of the high-voltage GIL equipment is characterized by comprising a control unit and two monitoring units; the control unit is connected with each monitoring unit, and each monitoring unit is respectively arranged at two ends of the GIL equipment;
Each monitoring unit is used for monitoring the transient voltage when the GIL equipment fails, recording the time when the transient voltage reaches the monitoring unit, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring unit to the control unit;
The control unit is used for storing the transient voltage, obtaining the time delay of the transient voltage according to the time when the transient voltage reaches each monitoring unit, and positioning the fault occurrence position according to the time delay.
2. The apparatus for accurately positioning the fault of the high voltage GIL device as claimed in claim 1, wherein the monitoring unit comprises a voltage sensor and a monitoring terminal; the voltage sensor is arranged in the gas chamber of the GIL equipment and is electrically connected with the monitoring terminal, and the monitoring terminal is connected with the control unit;
The voltage sensor is used for monitoring the transient voltage when the GIL equipment fails and transmitting the transient voltage when the GIL equipment fails to the monitoring terminal;
the monitoring terminal is used for recording the transient voltage, recording the time when the transient voltage reaches the monitoring terminal, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring terminal to the control unit.
3. The apparatus for precise fault location of high voltage GIL devices of claim 2, wherein the voltage sensor comprises a bus bar, a plenum housing, a hand hole, an induction electrode, and a hand hole cover plate;
The bus is arranged in the air chamber, the hand hole is arranged in the air chamber shell, the induction electrode is arranged in the hand hole, and the hand hole cover plate covers the hand hole;
The monitoring terminal is electrically connected with the hand hole cover plate and used for recording the transient voltage of the induction electrode relative to the hand hole cover plate.
4. The apparatus as claimed in claim 3, wherein the voltage sensor further comprises a connector disposed on the hand hole cover plate and electrically connected to the sensing electrode and the monitoring terminal, respectively, the connector being adapted to transmit the transient voltage of the sensing electrode with respect to the hand hole cover plate to the monitoring terminal.
5. The apparatus of claim 3, wherein the voltage sensor further comprises an insulating film disposed between the sensing electrode and the hand hole cover plate.
6. The apparatus for accurately positioning the fault of the high voltage GIL device as claimed in claim 2, wherein said monitoring terminal comprises a sampling unit and a GPS module;
The GPS module is electrically connected with the sampling unit and used for recording the moment when the transient voltage reaches the monitoring terminal;
The sampling unit is respectively connected with the voltage sensor and the control unit and is used for recording the transient voltage of the GIL equipment when the GIL equipment fails, which is monitored by the voltage sensor, and transmitting the transient voltage and the time when the transient voltage reaches the monitoring terminal to the control unit.
7. The apparatus for accurately locating the fault in the high voltage GIL device as claimed in claim 6, wherein said monitor terminal further comprises a transformer and a power supply module;
the transformer is respectively electrically connected with an external power supply and the power module and is used for transforming the alternating current power supply provided by the external power supply and then transmitting the transformed alternating current power supply to the power module;
The power module is respectively electrically connected with the sampling unit and the GPS module and is used for converting an alternating current power supply transmitted by the transformer into a direct current power supply and then supplying power to the sampling unit and the GPS module.
8. the apparatus as claimed in claim 2, wherein the apparatus further comprises a shielding box, the monitoring terminal is disposed in the shielding box, and the shielding box is fixedly disposed outside the gas chamber.
9. the apparatus for accurately positioning the fault of the high voltage GIL device as claimed in claim 2, wherein the control unit comprises a switch and a server connected to the switch;
the switch is connected with the monitoring terminals through optical fibers and is used for transmitting the moment when the transient voltage reaches each monitoring terminal and the transient voltage transmitted by each monitoring terminal to the server;
The server is used for storing the transient voltage, judging whether the transient voltage exceeds a preset threshold value, alarming the transient voltage exceeding the preset threshold value, obtaining the time delay of the transient voltage according to the moment when the transient voltage reaches each monitoring terminal, and positioning the fault occurrence position according to the time delay.
10. A fault pinpointing method for high-voltage GIL equipment, applied to the fault pinpointing apparatus for high-voltage GIL equipment of any of claims 1 to 9, comprising:
Each monitoring unit monitors transient voltage when GIL equipment fails, records the time when the transient voltage reaches the monitoring unit, and transmits the transient voltage and the time when the transient voltage reaches the monitoring unit to a control unit;
The control unit stores the transient voltage, obtains the time delay of the transient voltage according to the time when the transient voltage respectively reaches each monitoring unit, and positions the fault occurrence position according to the time delay.
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| CN111077391A (en) * | 2019-12-20 | 2020-04-28 | 中国能源建设集团江苏省电力设计院有限公司 | Real-time monitoring system for GIL (Gate in line) |
| CN111562463A (en) * | 2020-05-11 | 2020-08-21 | 云南电网有限责任公司电力科学研究院 | GIL fault positioning system and method based on optical fiber communication |
| CN111830313A (en) * | 2020-07-07 | 2020-10-27 | 国网福建省电力有限公司电力科学研究院 | Transient overvoltage broadband monitoring system for modular multilevel converter |
| CN111965493A (en) * | 2020-08-31 | 2020-11-20 | 广东电网有限责任公司广州供电局 | Cable fault point positioning system |
| CN114167220A (en) * | 2021-12-10 | 2022-03-11 | 国网江苏省电力有限公司南通供电分公司 | GIL equipment fault positioning system and method for connecting with cable |
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