CN115774229B - Fault transient voltage traveling wave speed online verification method and system - Google Patents
Fault transient voltage traveling wave speed online verification method and system Download PDFInfo
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- CN115774229B CN115774229B CN202211470786.4A CN202211470786A CN115774229B CN 115774229 B CN115774229 B CN 115774229B CN 202211470786 A CN202211470786 A CN 202211470786A CN 115774229 B CN115774229 B CN 115774229B
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- 230000001052 transient effect Effects 0.000 title claims abstract description 126
- 238000012795 verification Methods 0.000 title claims abstract description 23
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- 230000015556 catabolic process Effects 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000012212 insulator Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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 invention discloses a fault transient voltage traveling wave speed online checking method and system, comprising the following steps: acquiring transient voltage traveling wave signals excited by air gap breakdown between a moving contact and a static contact of a rapid grounding switch configured for long-distance GIL equipment in a cold standby maintenance state; obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal reaching the first sensor and the second sensor; obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice; and obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed. By adopting the technical scheme of the invention, the positioning precision of the long-distance GIL fault positioning on-line monitoring system is effectively provided.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a fault transient voltage traveling wave speed online verification method and system in long-distance GIL equipment.
Background
The gas insulated power transmission line (gas-insulated transmission lines, abbreviated as GIL) is high-voltage and high-current power transmission equipment insulated by high-voltage gas (such as SF6, SF6 mixed gas and the like), has large transmission capacity, low unit loss, small environmental impact, high operation reliability and land occupation saving, and is widely applied to electric energy delivery occasions of large hydropower stations and nuclear power stations. Once a breakdown accident occurs in high-voltage GIL with a length of several kilometers, a transmission channel is blocked, the power output of a power station is affected, and a large power grid is safe and stable. Therefore, to reduce the impact of a power outage, it is desirable to quickly and accurately locate the breakdown location inside the GIL. The internal insulation fault of the GIL generates transient voltage traveling wave, and fault location is carried out by utilizing the time difference of the transient traveling wave signal reaching the measuring points at the two ends of the GIL, so that the fault location is a location means commonly adopted at present. In order to improve the fault localization accuracy of GIL, the influence of propagation speed errors of transient voltage traveling waves inside GIL needs to be eliminated. The propagation speed of the transient voltage traveling wave in SF6 gas is stable, and the transient voltage traveling wave is conveniently measured through a test. There are a large number of epoxy insulators in the long distance GIL including tub insulators and three post insulators. The relative dielectric constant of the epoxy resin is relatively high, and the propagation speed of transient voltage traveling waves is affected, so that in order to accurately obtain the propagation speed of the transient voltage in the actual GIL engineering, online verification of the wave speed of the GIL with the transient voltage monitoring system is urgently needed at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fault transient voltage traveling wave speed on-line verification method and system in long-distance GIL equipment, and effectively provides the positioning accuracy of a long-distance GIL fault positioning on-line monitoring system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a fault transient voltage traveling wave speed online checking method which is characterized by comprising the following steps of:
s1, acquiring transient voltage traveling wave signals excited by air gap breakdown between a moving contact and a fixed contact when a rapid grounding switch configured by long-distance GIL equipment is in a cold standby maintenance state;
step S2, obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal reaching the first sensor and the second sensor;
step S3, obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
and S4, obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed.
Preferably, the long-distance GIL appliance is provided with the fast ground switch within 200 meters from the outlet sleeve.
Preferably, the first and second sensors are arranged on the pipe body within 15 meters of the outlet sleeve.
Preferably, the first propagation velocity v of the transient voltage within GIL 1 I.e.
Wherein t is 1 T is the moment when the transient voltage traveling wave signal line reaches the first sensor for the first time 2 L is the moment when the transient voltage traveling wave signal line reaches the second sensor for the first time 1 Distance L for the fast grounding switch of the first sensor distance 2 Distance of the fast grounding switch for the distance of the second sensor, and L 2 Greater than L 1 。
Preferably, the time for the transient voltage traveling wave signal to reach the second sensor measuring point for the first time is t 2 The refraction and reflection occur at the outlet sleeve at the side of the second sensor, the refraction and reflection occur to the fault point, then the negative total reflection occurs at the fault point, the refraction and reflection occur again to the outlet sleeve at the side of the second sensor, the time when the second time reaches the second sensor is t 3 According to the distance L between the quick grounding switch and the outlet sleeve on the second sensor side 3 Obtaining a second propagation velocity v of the transient voltage in the GIL 2 I.e.,
preferably, the method comprisesThe transient voltage propagation velocity v in GIL is:
the invention also provides a fault transient voltage traveling wave speed online checking system, which comprises the following steps:
the acquisition device is used for acquiring transient voltage traveling wave signals excited by the breakdown of an air gap between the moving contact and the fixed contact when the rapid grounding switch configured by the long-distance GIL equipment is in a cold standby maintenance state;
the first computing device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the arrival of the transient voltage traveling wave signal at the first sensor and the arrival of the transient voltage traveling wave signal at the second sensor;
the second computing device is used for obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
and the third calculation device is used for obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed.
Preferably, the long-distance GIL device is provided with the fast ground switch within 200 meters from the outlet sleeve; the first sensor and the second sensor are arranged on the pipe body within 15 meters from the outlet sleeve.
By adopting the technical scheme of the invention, firstly, the first propagation speed v of the transient voltage in the GIL is obtained according to the time difference between the transient voltage signal reaching the first sensor and the second sensor of the fault locating system 1 The method comprises the steps of carrying out a first treatment on the surface of the Secondly, according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice, the second propagation velocity v of the transient voltage in the GIL 2 The method comprises the steps of carrying out a first treatment on the surface of the Finally v is 1 And v 2 And (3) averaging to obtain the transient voltage propagation speed v in the GIL, so as to realize the online verification of the transient voltage traveling wave propagation speed in the actual engineering, and effectively provide the positioning accuracy of the long-distance GIL fault positioning online monitoring system.
Drawings
FIG. 1 is a schematic diagram of transient voltage based fault double-ended localization in long-range GIL;
FIG. 2 is a flowchart of a fault transient voltage traveling wave speed online verification method according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a transient voltage sensor in a long distance GIL in a fast grounding switch;
FIG. 4 is a schematic diagram showing the waveform of the transient voltage during the switching on of the fast ground switch in the long-distance GIL;
fig. 5 is a schematic diagram of transient voltage waveforms excited when the fast ground switch is closed in the long-distance GIL.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
as shown in FIG. 1, when insulation breakdown occurs in the GIL, transient voltage with steep wave head is transmitted from the fault point to the two ends of the GIL, the distance between the two transient voltage sensors is L, and the time for the transient voltage traveling wave to reach the first sensor is t s The time to reach the second sensor is t n The fault point is at a distance L from the first sensor ss The following formula is used for the calculation.
Wherein v represents the propagation speed of the transient voltage in the GIL, and the error of the propagation speed v, which is obtained by measuring the actual GIL, directly affects the positioning accuracy of the fault point. In general, v is taken as 294m/s in rough calculation, in order to improve positioning accuracy, online verification of the propagation speed of transient voltage traveling waves in actual GIL engineering is required, as shown in fig. 2, the embodiment of the invention provides an online verification method of fault transient voltage traveling wave speed in long-distance GIL equipment, which comprises the following steps:
s1, acquiring transient voltage traveling wave signals excited by air gap breakdown between a moving contact and a fixed contact when a rapid grounding switch configured by long-distance GIL equipment is in a cold standby maintenance state;
step S2, obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal reaching the first sensor and the second sensor;
step S3, obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
and S4, obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed.
As one implementation of the embodiment of the present invention, in step S1, the long-distance GIL device is provided with a fast grounding switch within 200 meters from the outlet sleeve, so as to facilitate the GIL device to change from the cold standby state to the maintenance state. The first sensor and the second sensor of the GIL fault accurate positioning system based on transient point voltage monitoring are arranged on a pipe body within 15 meters from the outlet sleeve, and the arrangement diagram is shown in fig. 3. The distance between the first sensor and the quick grounding switch is L 1 The distance between the second sensor and the quick grounding switch is L 2 And L is 2 Greater than L 1 The distance between the quick grounding switch and the outlet sleeve on the second sensor side is L 3 . When GIL actually operates and overhauls, the equipment is changed from a cold standby state to an overhauling state, and when the quick grounding switch is switched on, because induced voltage exists on the GIL, a breakdown arc is generated between the moving contact and the static contact of the quick grounding switch-on, and transient voltage is excited. The whole process of the generated transient voltage is shown in FIG. 4, in which the induced electricity with the peak value close to 100kV exists on GILWhen the air gap between the movable contact and the fixed contact of the quick grounding switch breaks down, the induced voltage drops to zero quickly, and the excited transient voltage propagates back and forth between the quick grounding switch and the GIL outlet sleeve, so that a typical transient voltage traveling wave is formed.
As one implementation manner of the embodiment of the present invention, in step S2, a signal of 500us near the first abrupt change time of the power frequency voltage is extracted, as shown in FIG. 5, the transient voltage traveling wave signal of the first sensor measuring point is u 1 The transient voltage traveling wave signal of the second sensor measuring point is u 2 . Determining the first arrival time t of the transient voltage traveling wave signal at the first sensor by using a synchronous time setting system 1 And at the second sensor, the first arrival time t of the transient voltage traveling wave signal 2 . According to the distance between the first sensor and the second sensor and the grounding switch, a first propagation speed v of the transient voltage in the GIL is obtained 1 I.e.
In step S3, a transient voltage traveling wave signal u measured at the measuring point of the second sensor is selected 2 As can be seen from fig. 5, the time for the transient voltage traveling wave signal to reach the second sensor measurement point for the first time is t 2 Then, the refraction and reflection occur at the outlet sleeve at the side of the second sensor, most of the reflection GIL propagates to the fault point, then the negative total reflection occurs at the fault point, and propagates to the outlet sleeve at the side of the second sensor again, and the time for reaching the second sensor for the second time is t 3 Thus t 2 And t 3 The time difference T between the two is twice the time required for the transient voltage traveling wave signal to propagate from the fault point to the second sensor side outlet sleeve, and the distance between the fast grounding switch and the second sensor side outlet sleeve is L 3 The second propagation velocity v of the transient voltage in GIL can be obtained 2 I.e.
In step S4, the propagation speed of the transient voltage in the GIL obtained by the two methods is averaged to obtain the final propagation speed v of the transient voltage in the GIL, so as to realize online verification of the propagation speed of the transient voltage traveling wave in the actual engineering.
The embodiment of the invention utilizes a transient voltage signal excited by the breakdown of an air gap between a moving contact and a fixed contact when a quick grounding switch configured by long-distance GIL equipment is in a cold standby maintenance state to extract the time difference between the signal reaching a first sensor and a second sensor of a fault positioning system, and obtains a first propagation speed v of the transient voltage in the GIL 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the time difference of the transient voltage traveling wave signal reaching the second sensor twice, the second propagation velocity v of the transient voltage in the GIL 2 . Finally v is 1 And v 2 And (3) averaging to obtain the transient voltage propagation speed v in the GIL, so as to realize the online verification of the transient voltage traveling wave propagation speed in the actual engineering, and effectively provide the positioning accuracy of the long-distance GIL fault positioning online monitoring system.
Example 2:
the invention also provides a fault transient voltage traveling wave speed online checking system, which comprises the following steps:
the acquisition device is used for acquiring transient voltage traveling wave signals excited by the breakdown of an air gap between the moving contact and the fixed contact when the rapid grounding switch configured by the long-distance GIL equipment is in a cold standby maintenance state;
the first computing device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the arrival of the transient voltage traveling wave signal at the first sensor and the arrival of the transient voltage traveling wave signal at the second sensor;
the second computing device is used for obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
and the third calculation device is used for obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed.
As one implementation of the embodiment of the present invention, the long-distance GIL device is provided with the fast ground switch within 200 meters from the outlet sleeve; the first sensor and the second sensor are arranged on the pipe body within 15 meters from the outlet sleeve.
The above description is merely illustrative 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 should be covered by the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (5)
1. The fault transient voltage traveling wave speed online checking method is characterized by comprising the following steps of:
s1, acquiring transient voltage traveling wave signals excited by air gap breakdown between a moving contact and a fixed contact when a rapid grounding switch configured by long-distance GIL equipment is in a cold standby maintenance state;
step S2, obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal reaching the first sensor and the second sensor;
step S3, obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
step S4, according to the first propagation speed and the second propagation speed, the propagation speed of the transient voltage in the GIL is obtained, and the online verification of the propagation speed of the transient voltage traveling wave is realized;
wherein the time when the transient voltage traveling wave signal reaches the measuring point of the second sensor for the first time is t 2 The second sensor side outlet sleeve is subjected to refraction and reflection, propagates to the fault point, then is subjected to negative total reflection at the fault point, and is subjected to return toThe second sensor side outlet sleeve propagates in the direction, and the second time reaches the second sensor is t 3 According to the distance L between the quick grounding switch and the outlet sleeve on the second sensor side 3 Obtaining a second propagation velocity v of the transient voltage in the GIL 2 I.e. V 2 ＝2L 3 /(t 3 -t 2 )；
First propagation velocity v of the transient voltage within GIL 1 I.e.
Wherein t is 1 T is the moment when the transient voltage traveling wave signal line reaches the first sensor for the first time 2 L is the moment when the transient voltage traveling wave signal line reaches the second sensor for the first time 1 Distance L for the fast grounding switch of the first sensor distance 2 Distance of the fast grounding switch for the distance of the second sensor, and L 2 Greater than L 1 。
2. The fault transient voltage traveling wave velocity online verification method of claim 1, wherein the long-distance GIL device sets the fast ground switch within 200 meters of the outlet sleeve.
3. The fault transient voltage traveling wave velocity on-line verification method of claim 2, wherein the first sensor and the second sensor are disposed on a pipe body within 15 meters from the outlet sleeve.
4. The online fault transient voltage traveling wave velocity verification method of claim 3, wherein the transient voltage propagation velocity v in GIL is:
5. a fault transient voltage traveling wave velocity on-line verification system for implementing the fault transient voltage traveling wave velocity on-line verification method of any one of claims 1 to 4, characterized by comprising:
the acquisition device is used for acquiring transient voltage traveling wave signals excited by the breakdown of an air gap between the moving contact and the fixed contact when the rapid grounding switch configured by the long-distance GIL equipment is in a cold standby maintenance state;
the first computing device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the arrival of the transient voltage traveling wave signal at the first sensor and the arrival of the transient voltage traveling wave signal at the second sensor;
the second computing device is used for obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signal reaching the second sensor twice;
and the third calculation device is used for obtaining the transient voltage propagation speed in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the transient voltage traveling wave propagation speed.
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