CN115774229A - Fault transient voltage traveling wave speed online verification method and system - Google Patents
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Abstract
The invention discloses a fault transient voltage traveling wave speed online checking method and a system, comprising the following steps: acquiring a transient voltage traveling wave signal excited by air gap breakdown between a moving contact and a static contact when a quick grounding switch configured in the long-distance GIL equipment is in a cold standby to overhaul state; 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; according to the time difference that the transient voltage traveling wave signal reaches a second sensor twice, a second transmission speed of the transient voltage in the GIL is obtained; and obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the transient voltage traveling wave. By adopting the technical scheme of the invention, the positioning precision of the long-distance GIL fault positioning online monitoring system is effectively improved.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to an online checking method and system for fault transient voltage traveling wave speed in long-distance GIL equipment.
Background
Gas-insulated transmission lines (GIL) are high-voltage and high-current power transmission equipment insulated by high-pressure gas (such as SF6, SF6 mixed gas and the like), have large transmission capacity, low unit loss, small environmental influence, high operation reliability, land occupation saving and wide application in electric energy sending occasions of large hydropower stations and nuclear power stations. Once insulation breakdown accident happens to the high-voltage GIL with the length of several kilometers, a power transmission channel is blocked, and the power output of a power station and the safety and stability of a large power grid are influenced. Therefore, to reduce the power outage effect, the breakdown location inside the GIL needs to be quickly and accurately located. The insulation fault inside the GIL generates a transient voltage traveling wave, and the fault location is carried out by utilizing the time difference of a transient traveling wave signal reaching measuring points at two ends of the GIL, which is a commonly adopted location means at present. In order to improve the fault location accuracy of the GIL, the influence of the propagation speed error of the transient voltage traveling wave inside the 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 can be conveniently measured through tests. There are a number of epoxy insulators in long distance GIL including basin insulators and three post insulators. The high relative dielectric constant of the epoxy resin affects the propagation velocity of the transient voltage traveling wave, so that the online verification of the wave velocity of the GIL with the installed transient voltage monitoring system is urgently needed at present in order to accurately obtain the transient voltage propagation velocity in the actual GIL engineering.
Disclosure of Invention
The invention aims to provide a fault transient voltage traveling wave speed online verification method and system in long-distance GIL equipment, and effectively provide the positioning accuracy of a long-distance GIL fault positioning online monitoring system.
In order to realize the purpose, the 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 a transient voltage traveling wave signal excited by air gap breakdown between a moving contact and a static contact when a fast grounding switch configured in the long-distance GIL equipment is in a cold standby to overhaul state;
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 and the first sensor and the second sensor;
s3, obtaining a second propagation speed of the transient voltage in the GIL according to the time difference of the transient voltage traveling wave signals reaching a second sensor twice;
and S4, obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the transient voltage traveling wave.
Preferably, the long-distance GIL device is provided with the fast grounding switch within 200 meters of the outgoing line bushing.
Preferably, the first sensor and the second sensor are arranged on the pipe body within 15 meters from the outgoing line casing.
Preferably, the first propagation velocity v of the transient voltage within the GIL 1 I.e. by
Wherein, t 1 The moment when the traveling wave signal line of the transient voltage reaches the first sensor for the first time, t 2 The moment when the traveling wave signal line of the transient voltage reaches the second sensor for the first time, L 1 For the first sensor from the fast earthing switch distance, L 2 Is a firstTwo sensors apart from the fast earthing switch distance, and L 2 Greater than L 1 。
Preferably, the time when the transient voltage traveling wave signal firstly reaches the measuring point of the second sensor is t 2 The refraction and reflection occur at the outgoing line sleeve at the second sensor side, the reflected light propagates to the fault point, then the negative total reflection occurs at the fault point, the reflected light propagates to the outgoing line sleeve at the second sensor side again, and the time of the reflected light reaching the second sensor for the second time is t 3 According to the distance L between the quick grounding switch and the wire outlet sleeve on the side of the second sensor 3 Obtaining a second propagation velocity v of the transient voltage in the GIL 2 That is to say that,
preferably, the transient voltage propagation velocity v in the GIL is:
the invention also provides a fault transient voltage traveling wave speed online checking system, which comprises:
the acquisition device is used for acquiring a transient voltage traveling wave signal excited by breakdown of an air gap between a moving contact and a static contact when the fast grounding switch configured for the long-distance GIL equipment is in a cold standby to overhaul state;
the first calculation device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal and the first sensor;
the second calculating device is used for obtaining a second propagation speed of the transient voltage in the GIL according to the time difference that the transient voltage traveling wave signal reaches the second sensor twice;
and the third calculating device is used for obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the traveling wave of the transient voltage.
Preferably, the fast grounding switch is arranged in the long-distance GIL equipment within 200 meters of the outgoing line sleeve; the first sensor and the second sensor are arranged on the pipe body within 15 meters of the outgoing line 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 positioning system 1 (ii) a Secondly, according to the time difference of the traveling wave signal of the transient voltage reaching the second sensor twice, the second propagation velocity v of the transient voltage in the GIL 2 (ii) a Finally v will be 1 And v 2 And averaging to obtain the propagation velocity v of the transient voltage in the GIL, so that the online verification of the propagation velocity of the transient voltage traveling wave in the actual engineering is realized, and the positioning accuracy of the long-distance GIL fault positioning online monitoring system is effectively improved.
Drawings
FIG. 1 is a schematic diagram of transient voltage based fault double-ended localization in a long-range GIL;
FIG. 2 is a flowchart of a fault transient voltage traveling wave speed online calibration method according to an embodiment of the present invention;
FIG. 3 is a layout diagram of the transient voltage sensor in the long-reach GIL with the fast grounding switch;
FIG. 4 is a schematic diagram of the waveform of the transient voltage excited during closing of the fast grounding switch in the long-distance GIL;
fig. 5 is a schematic diagram of a transient voltage waveform excited when the fast ground switch in the long-distance GIL is closed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
as shown in FIG. 1, when insulation breakdown occurs inside the GIL, a transient voltage with a steep wave head is generated and propagates from a fault point to two ends of the GIL, the distance between two transient voltage sensors is L, and the time of a transient voltage traveling wave reaching a first sensor is t s The time of arrival at the second sensor is t n The distance L between the fault point and the first sensor ss The following equation is used.
Wherein v represents the propagation velocity of the transient voltage in the GIL, L is measured according to the actual GIL, and the error of the propagation velocity v will directly affect the positioning accuracy of the fault point. Generally, during rough calculation, v is 294m/s, and in order to improve positioning accuracy, it is necessary to perform online verification on the propagation velocity of the transient voltage traveling wave in the actual GIL project, as shown in fig. 2, an embodiment of the present invention provides an online verification method for the traveling velocity of the fault transient voltage traveling wave in the long-distance GIL device, including the following steps:
s1, acquiring a transient voltage traveling wave signal excited by air gap breakdown between a moving contact and a static contact when a fast grounding switch configured in the long-distance GIL equipment is in a cold standby to overhaul state;
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 and the first sensor and the second sensor;
s3, according to the time difference that the transient voltage traveling wave signal reaches a second sensor twice, obtaining a second transmission speed of the transient voltage in the GIL;
and S4, obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the transient voltage traveling wave.
As an implementation manner 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 of the outgoing line bushing, which is convenient for the long-distance GIL device to be installedThe GIL facility transitions from a cold standby state to a service state. A first sensor and a second sensor of a GIL fault accurate positioning system based on transient point voltage monitoring are arranged on a pipe body within 15 meters of an outgoing line casing, and the arrangement diagram is shown in figure 3. The distance between the first sensor and the fast grounding switch is L 1 The distance between the second sensor and the fast grounding switch is L 2 And L is 2 Greater than L 1 The distance between the quick grounding switch and the outgoing line sleeve at the side of the second sensor is L 3 . When GIL actual operation overhauls often at that time, equipment changes the maintenance state from cold reserve, and when quick earthing switch closed a floodgate, because there is induced voltage on the GIL, consequently will produce the breakdown electric arc between the sound contact of quick ground connection switching-off, arouse transient voltage. The whole process of the generated transient voltage is shown in fig. 4, it can be seen that an induced voltage with a peak value close to 100kV exists on GIL, when an air gap between a moving contact and a static contact of the fast grounding switch breaks down, the induced voltage drops to zero rapidly, and the excited transient voltage propagates back and forth between the fast grounding switch and the GIL outlet sleeve to form a typical transient voltage traveling wave.
As an implementation manner of the embodiment of the invention, in step S2, a signal of 500us near the first sudden change time of the power frequency voltage is extracted, and as shown in FIG. 5, the transient voltage traveling wave signal at the measuring point of the first sensor is u 1 And 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 synchronization 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, the first propagation velocity v of the transient voltage in the GIL is obtained 1 I.e. by
As an implementation manner of the embodiment of the invention, in step S3, the 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 transient stateThe time when the voltage traveling wave signal reaches a measuring point of a second sensor for the first time is t 2 Then, catadioptric occurs at the outgoing line sleeve at the side of the second sensor, most of the reflected GIL propagates to the fault point, then negative total reflection occurs at the fault point, the reflected GIL propagates to the outgoing line sleeve at the side of the second sensor again, and the time of reaching the second sensor for the second time is t 3 Thus t is t 2 And t 3 The time difference T is twice of the time required for the transient voltage traveling wave signal to propagate from the fault point to the outgoing line bushing on the side of the second sensor, and the distance between the fast grounding switch and the outgoing line bushing on the side of the second sensor is L 3 The second propagation velocity v of the transient voltage in the GIL can be obtained 2 I.e. by
As an implementation manner of the embodiment of the present invention, in step S4, the propagation velocity of the transient voltage in the GIL obtained by the two methods is averaged to obtain the final propagation velocity v of the transient voltage in the GIL, so as to implement online verification of the propagation velocity of the traveling wave of the transient voltage in the actual engineering.
In the embodiment of the invention, a transient voltage signal excited by breakdown of an air gap between a moving contact and a static contact when a quick grounding switch configured in long-distance GIL equipment is in a cold standby to overhaul state is utilized, the time difference between the signal and a first sensor and a second sensor of a fault positioning system is extracted, and a first propagation speed v of the transient voltage in the GIL is obtained 1 (ii) a According to the time difference of the traveling wave signal of the transient voltage reaching the second sensor twice, the second propagation velocity v of the transient voltage in the GIL 2 . Finally v will be 1 And v 2 And averaging to obtain the propagation velocity v of the transient voltage in the GIL, so that the online verification of the propagation velocity of the transient voltage traveling wave in the actual engineering is realized, and the positioning accuracy of the long-distance GIL fault positioning online monitoring system is effectively improved.
Example 2:
the invention also provides a fault transient voltage traveling wave speed online checking system, which comprises:
the acquisition device is used for acquiring a transient voltage traveling wave signal excited by air gap breakdown between a moving contact and a static contact when the fast grounding switch configured in the long-distance GIL equipment is in a cold standby to overhaul state;
the first calculation device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal and the first sensor;
the second calculation 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 calculating device is used for obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the traveling wave of the transient voltage.
As an implementation manner of the embodiment of the present invention, the fast grounding switch is disposed in the long-distance GIL device within 200 meters from the outgoing line casing; the first sensor and the second sensor are arranged on the pipe body within 15 meters of the outgoing line sleeve.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention shall be covered within the scope of the present invention, and therefore, the scope of the present invention shall be subject to the scope of the claims.
Claims (8)
1. A fault transient voltage traveling wave speed online calibration method is characterized by comprising the following steps:
s1, acquiring a transient voltage traveling wave signal excited by breakdown of an air gap between a moving contact and a static contact when a quick grounding switch configured for long-distance GIL equipment is in a cold standby to overhaul state;
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 and the first sensor and the second sensor;
s3, according to the time difference that the transient voltage traveling wave signal reaches a second sensor twice, obtaining a second transmission speed of the transient voltage in the GIL;
and S4, obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the transient voltage traveling wave.
2. The fault transient voltage traveling wave speed on-line verification method of claim 1, wherein the long-range GIL device sets the fast grounding switch within 200 meters of an outgoing line bushing.
3. The method of online verification of fault transient voltage traveling wave velocity of claim 2, wherein the first sensor and the second sensor are disposed on the tubular body within 15 meters of the outgoing tubular casing.
4. The fault transient voltage traveling wave velocity online verification method of claim 3, wherein the first propagation velocity v of the transient voltage within the GIL 1 I.e. by
Wherein, t 1 The moment when the traveling wave signal line of the transient voltage reaches the first sensor for the first time, t 2 The moment when the traveling wave signal line of the transient voltage reaches the second sensor for the first time, L 1 For the first sensor from the fast earthing switch distance, L 2 A second sensor is spaced from the fast earthing switch by a distance of L 2 Greater than L 1 。
5. The fault transient voltage of claim 4The method for on-line calibration of the traveling wave speed is characterized in that 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 refraction and reflection occur at the outgoing line sleeve at the second sensor side, the outgoing line sleeve propagates to the fault point, then the negative total reflection occurs at the fault point, the outgoing line sleeve propagates to the second sensor side again, and the time of the second arrival at the second sensor is t 3 According to the distance L between the quick grounding switch and the wire outlet sleeve on the side of the second sensor 3 Obtaining a second propagation velocity v of the transient voltage in the GIL 2 That is to say that,
6. the fault transient voltage traveling wave velocity online verification method of claim 5, wherein the transient voltage propagation velocity v in the GIL is:
7. a fault transient voltage traveling wave speed online verification system is characterized by comprising:
the acquisition device is used for acquiring a transient voltage traveling wave signal excited by air gap breakdown between a moving contact and a static contact when the fast grounding switch configured in the long-distance GIL equipment is in a cold standby to overhaul state;
the first calculation device is used for obtaining a first propagation speed of the transient voltage in the GIL according to the time difference between the transient voltage traveling wave signal and the first sensor;
the second calculation 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 calculating device is used for obtaining the propagation speed of the transient voltage in the GIL according to the first propagation speed and the second propagation speed, and realizing the online verification of the propagation speed of the traveling wave of the transient voltage.
8. The fault transient voltage traveling wave speed online verification system of claim 7, wherein said long-range GIL device sets said fast grounding switch within 200 meters of an outgoing line casing; the first sensor and the second sensor are arranged on the pipe body within 15 meters of the outgoing line casing.
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