CN217112579U - GIL equipment fault positioning system based on transient ground potential rise measurement - Google Patents
GIL equipment fault positioning system based on transient ground potential rise measurement Download PDFInfo
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Abstract
The utility model provides a GIL equipment fault positioning system based on transient state earth potential rises measurement relates to electrical equipment technical field. The system comprises a transient ground potential sensor, a monitoring terminal, an on-site power supply unit and an upper control system, wherein the transient ground potential sensor is used for being installed on a flange at the end part of a bushing outlet wire of the GIL equipment; the monitoring terminal is connected with the transient ground potential sensor; the local power supply unit is connected with the monitoring terminal and used for taking power on site and supplying power to the monitoring terminal; and the upper control system is connected with the monitoring terminal. According to the system, the transient ground potential sensor is additionally arranged at the flange at the end part of the bushing outlet of the GIL equipment, the upper control system collects transient ground potential data of a measuring point by using the transient ground potential sensor to form a transient ground potential waveform, and the fault point of the GIL equipment can be quickly and accurately positioned by combining the characteristic moment of the transient ground potential waveform, so that the installation is convenient and fast.
Description
Technical Field
The utility model relates to an electrical equipment technical field particularly, relates to a GIL equipment fault location system based on transient state earth potential rise is measured.
Background
Gas-insulated transmission lines (GIL) are high-voltage and high-current power transmission equipment insulated by high-voltage gas (such as mixed gas of SF6 and SF 6), and metal shells and conductors are coaxially arranged, so that the gas-insulated transmission line is widely applied to electric energy sending occasions of large-scale hydropower stations and nuclear power stations. 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.
In the field voltage withstanding and operation process of the high-voltage GIL equipment, insulation breakdown faults are often caused due to defects of production or installation processes. Once insulation breakdown occurs in the high-voltage GIL, a power transmission channel is blocked, and power output of a power station is influenced. In order to reduce the influence of power failure, after the high-voltage GIL equipment has insulation breakdown failure, the breakdown position needs to be quickly and accurately positioned. As most faults of the overhead lines are directly visible, most cable fault positions are distributed at the joints and the terminals, and the troubleshooting time is short. However, the GIL equipment is not convenient to quickly locate the fault position due to the totally closed structure. Because the GIL is long in length and multiple in gas chambers, the conventional gas decomposition product detection method is directly adopted to locate the fault gas chamber, the required time cost is too large, and the practicability is not high. Therefore, there is an urgent need to develop a fast and accurate positioning method for high voltage GIL devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a GIL equipment fault location system based on transient state ground potential rises measurement, its characteristic that can combine transient state ground potential waveform is constantly, realizes the accurate positioning of the fault point of GIL equipment.
The embodiment of the utility model discloses a can realize like this:
in a first aspect, the utility model provides a GIL equipment fault location system based on transient state earth potential rise is measured, the system includes:
the transient ground potential sensor is used for being installed at a flange at the end part of a bushing outlet wire of the GIL equipment;
the monitoring terminal is connected with the transient ground potential sensor;
the local power supply unit is connected with the monitoring terminal and used for taking power on site and supplying power to the monitoring terminal;
and the upper control system is connected with the monitoring terminal.
In an alternative embodiment, the high-voltage terminal of the transient ground potential sensor is used for connecting to the flange, and the ground terminal of the transient ground potential sensor is connected to the monitoring terminal.
In an optional embodiment, the monitoring terminal includes:
and the transient state ground potential sensor is directly connected with the N-type cable transition head on the surface of the shielding box.
In an optional embodiment, the monitoring terminal further includes:
the acquisition unit is arranged in the shielding box and is connected with the transient state ground potential sensor and the upper control system;
the power supply module is arranged in the shielding box and is connected with the acquisition unit;
and the depth isolation transformer is arranged in the shielding box and is connected between the power supply module and the local power supply unit.
In an alternative embodiment, the master control system comprises:
the optical switch is connected with the monitoring terminal through a single-mode optical fiber;
and the control host is connected with the optical switch.
In a second aspect, the utility model provides a GIL equipment fault location method based on transient state ground potential rise measurement, the method includes:
installing a transient ground potential sensor at a flange at the end of a bushing outlet of the GIL equipment;
transient ground potential data of the measuring points are collected by using a transient ground potential sensor to form a transient ground potential waveform;
and calculating the distance L from the fault point to the end part of the GIL equipment according to the transient ground potential waveform.
In an alternative embodiment, the step of calculating the distance L of the fault point from the end of the GIL device based on the transient ground potential waveform comprises:
analyzing the transient ground potential waveform to obtain a characteristic time t1 and a characteristic time t2 of the transient ground potential;
calculating the propagation time T from the fault point to the end part of the GIL equipment according to the characteristic time T1 and the characteristic time T2;
and calculating the distance L according to the propagation time T and the propagation speed v of the electromagnetic wave in the GIL equipment.
In an alternative embodiment, the propagation time T is calculated as:
T＝(t2-t1)/2。
in an alternative embodiment, the distance L is calculated as:
L＝T*v。
in an alternative embodiment, the maximum measurement voltage of the transient earth potential sensor is not lower than 40kV, the capacitance of the high-voltage arm is 50pF, the capacitance of the low-voltage arm is 100nF, and the voltage division ratio is 20000: 1, the frequency response bandwidth is 200 Hz-40 MHz.
The embodiment of the utility model provides a GIL equipment fault positioning system based on transient state earth potential rises and measures's beneficial effect includes:
the method is characterized in that a transient ground potential sensor is additionally arranged at a flange at the end part of a bushing outlet of the GIL equipment, transient ground potential data of a measuring point are collected by the transient ground potential sensor to form a transient ground potential waveform, and the fault point of the GIL equipment can be accurately positioned by combining the characteristic moment of the transient ground potential waveform.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 an application scenario schematic diagram of a GIL device fault location system based on transient ground potential rise measurement according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a transient ground waveform;
fig. 3 is a flowchart of a GIL device fault location method based on transient ground potential rise measurement according to a second embodiment of the present invention.
Icon: 100-a fault location system of the GIL equipment based on transient earth potential rise measurement; 110-transient ground potential sensor; 120-a monitoring terminal; 121-an acquisition unit; 122-a power supply module; 123-deep isolation transformer; 130-local power supply unit; 140-upper control system; 200-GIL equipment; 210-a cannula; 220-flange.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of 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.
First embodiment
Referring to fig. 1, the present embodiment provides a system 100 for locating a fault of a GIL device based on transient ground potential rise measurement (hereinafter, referred to as a system), which includes a transient ground potential sensor 110, a monitoring terminal 120, a local power supply unit 130, and an upper control system 140.
The transient ground potential sensor 110 is mounted on the flange 220 at the end of the bushing 210 of the GIL device 200 by using a capacitance voltage division principle, the high-voltage end of the transient ground potential sensor 110 may be fixed to the flange 220 by bolts, and the ground end of the transient ground potential sensor 110 is connected to the monitoring terminal 120. The transient ground potential sensor 110 is configured to collect transient ground data of the measurement point to form a transient ground potential waveform. The highest measurement voltage of transient state ground potential sensor 110 is not lower than 40kV, the high voltage arm capacitance is 50pF, the low voltage arm capacitance is 100nF, and the voltage division ratio is 20000: 1, the frequency response bandwidth is 200 Hz-40 MHz.
The monitoring terminal 120 includes a shielding box (not shown in the figure), and an acquisition unit 121, a power module 122 and a depth isolation transformer 123 installed in the shielding box, wherein the shielding box may be made of stainless steel, and the transient ground potential sensor 110 is directly connected to an N-type cable transition head on the surface of the shielding box. The acquisition unit 121 is connected with the transient earth potential sensor 110 and the upper control system 140; the power module 122 is connected with the acquisition unit 121; the deep isolation transformer 123 is connected between the power module 122 and the on-site power supply unit 130.
The local power supply unit 130 provides 220V ac power to the monitoring terminal 120, and the ac power passes through the deep isolation transformer 123 and is converted into dc power by the power module 122 to supply power to the acquisition unit 121. The sampling rate of the acquisition unit 121 is 200MS/s, the sampling analog bandwidth is 50MHz, and a FIFO mode of continuous acquisition and storage is supported. The acquisition unit 121 has a gradient triggering mode, and once the waveform of the monitored transient ground potential exceeds a set gradient, the acquisition card is triggered immediately for long-term recording.
The local power supply unit 130 can get power from a 220V power supply near the GIL site, and has at least 3-path output capacity, and the power supply power is not lower than 90W.
The upper control system 140 includes an optical switch (not shown), a control host (not shown), a display (not shown), a keyboard (not shown), and other devices, and may be disposed in a cubicle in the substation relay protection room. The optical switch is connected with the monitoring terminal 120 through a single mode fiber; and the control host computer stores and analyzes the transient earth potential data of each measuring point and extracts the characteristic moment of the transient earth potential waveform.
Referring to fig. 2, the control host obtains a characteristic time t1 and a characteristic time t2 of the transient ground potential by analyzing the waveform of the transient ground potential; calculating the propagation time T from the fault point to the end of the GIL device 200 according to the characteristic time T1 and the characteristic time T2; the distance L is calculated from the propagation time T and the propagation velocity v of the electromagnetic wave in the GIL apparatus 200.
The calculation formula of the propagation time T is as follows:
T＝(t2-t1)/2。
the distance L is calculated as:
L＝T*v。
in this embodiment, the propagation velocity v is 294 m/us.
The beneficial effects of the GIL equipment fault location system 100 based on the transient ground potential rise measurement provided by the embodiment include:
the transient ground potential sensor 110 is additionally arranged at a flange 220 at the outlet end of the sleeve 210 of the GIL equipment 200, the transient ground potential rise generated at the end of the sleeve 210 when the high-voltage GIL equipment 200 has insulation breakdown accidents during voltage resistance and operation is monitored, and the accurate positioning of the insulation breakdown faults inside the high-voltage GIL equipment 200 is realized by utilizing the characteristic moment of the waveform of the transient ground potential and finally combining the propagation speed of electromagnetic waves in the GIL equipment 200, so that the installation is convenient and fast, and powerful support is provided for improving the GIL fault processing efficiency.
Second embodiment
Referring to fig. 3, the present embodiment provides a fault location method (hereinafter, referred to as "method") for GIL equipment based on transient ground voltage rise measurement, which can be implemented by using the system provided in the first embodiment, and the method includes the following steps:
s1: the transient ground potential sensor 110 is mounted at the flange 220 at the outlet end of the bushing 210 of the GIL device 200.
Specifically, the transient ground potential sensor 110 is installed at the flange 220 at the end of the outlet of the bushing 210 of the GIL device 200 by using a capacitance voltage division principle, the high-voltage end of the transient ground potential sensor 110 may be fixed to the bolt at the flange 220, and the ground end of the transient ground potential sensor 110 is connected to the monitoring terminal 120.
S2: transient ground potential data of the measuring point is collected by using the transient ground potential sensor 110 to form a transient ground potential waveform.
The transient ground potential sensor 110 is configured to collect transient ground data of the measurement point to form a transient ground potential waveform. The highest measurement voltage of the transient earth potential sensor 110 is not lower than 40kV, the capacitance of the high-voltage arm is 50pF, the capacitance of the low-voltage arm is 100nF, and the voltage division ratio is 20000: 1, the frequency response bandwidth is 200 Hz-40 MHz.
S3: from the transient ground potential waveform, the distance L of the fault point from the end of the GIL device 200 is calculated.
Specifically, referring to fig. 2, first, the waveform of the transient ground potential is analyzed to obtain a characteristic time t1 and a characteristic time t2 of the transient ground potential.
Then, based on the characteristic time T1 and the characteristic time T2, a propagation time T from the fault point to the end of the GIL facility 200 is calculated, wherein the propagation time T is calculated by the formula:
T＝(t2-t1)/2。
finally, the distance L is calculated according to the propagation time T and the propagation velocity v of the electromagnetic wave in the GIL device 200, and the calculation formula of the distance L is as follows:
L＝T*v。
in this embodiment, the propagation velocity v is 294 m/us.
S2 can be implemented by the monitoring terminal 120 of the system in the first embodiment, and S3 can be implemented by the upper control system 140 of the system in the first embodiment.
The method for positioning the fault of the GIL equipment based on the transient ground potential rise measurement has the beneficial effects that:
the transient ground potential sensor 110 is additionally arranged at a flange 220 at the outlet end of the sleeve 210 of the GIL equipment 200, the transient ground potential rise generated at the end of the sleeve 210 when the high-voltage GIL equipment 200 has insulation breakdown accidents during voltage resistance and operation is monitored, and the accurate positioning of the insulation breakdown faults inside the high-voltage GIL equipment 200 is realized by utilizing the characteristic moment of the waveform of the transient ground potential and finally combining the propagation speed of electromagnetic waves in the GIL equipment 200, so that the installation is convenient and fast, and powerful support is provided for improving the GIL fault processing efficiency.
The above embodiments are only 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 should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A GIL device fault location system based on transient ground potential rise measurements, the system comprising:
a transient ground potential sensor (110) for mounting at a flange (220) at an outlet end of a bushing (210) of a GIL facility (200);
a monitoring terminal (120) connected to the transient ground potential sensor (110);
the local power supply unit (130) is connected with the monitoring terminal (120), and the local power supply unit (130) is used for locally taking power and supplying power to the monitoring terminal (120);
and the upper control system (140) is connected with the monitoring terminal (120).
2. The GIL facility fault location system based on transient ground potential rise measurement according to claim 1, wherein a high voltage terminal of said transient ground potential sensor (110) is used for connecting said flange (220), and a ground terminal of said transient ground potential sensor (110) is connected with said monitoring terminal (120).
3. The GIL facility fault location system based on transient ground potential rise measurement according to claim 1, wherein said monitor terminal (120) comprises:
a shielded enclosure, the transient ground potential sensor (110) being in direct communication with the shielded enclosure.
4. The GIL facility fault location system based on transient ground potential rise measurement according to claim 3, wherein said transient ground potential sensor (110) is directly connected to an N-type cable transition head of said shielded enclosure surface.
5. The GIL facility fault location system based on transient ground potential rise measurement according to claim 3, wherein said monitor terminal (120) further comprises:
the acquisition unit (121) is installed in the shielding box, and the acquisition unit (121) is connected with the transient ground potential sensor (110) and the upper control system (140);
the power supply module (122) is installed in the shielding box, and the power supply module (122) is connected with the acquisition unit (121);
a deep isolation transformer (123) mounted within the shielded enclosure, the deep isolation transformer (123) connected between the power module (122) and the local power supply unit (130).
6. The GIL facility fault location system based on transient ground potential rise measurement according to claim 3, wherein said shielding box is made of stainless steel.
7. The GIL facility fault location system based on transient ground potential rise measurements as claimed in claim 1, wherein said upper control system (140) comprises:
the optical switch is connected with the monitoring terminal (120);
and the control host is connected with the optical switch.
8. The GIL facility fault location system based on transient ground potential rise measurement according to claim 7, wherein said optical switch is connected to said monitoring terminal (120) by a single mode fiber.
9. The GIL equipment fault localization system based on transient ground potential rise measurement, according to claim 7, wherein the superordinate control system (140) further comprises:
and the display is used for displaying the transient ground potential waveform and the calculation result of the control host.
10. The GIL facility fault location system based on transient ground potential rise measurement according to claim 1, wherein said transient ground potential sensors (110) are adapted to be mounted at bolts of said flange (220).
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| CN114217190A (en) * | 2022-01-25 | 2022-03-22 | 四川省菁蓉和欣科技有限公司 | GIL equipment fault positioning system and method based on transient ground potential rise measurement |
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| CN114217190A (en) * | 2022-01-25 | 2022-03-22 | 四川省菁蓉和欣科技有限公司 | GIL equipment fault positioning system and method based on transient ground potential rise measurement |
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