GIS partial discharge on-line monitoring device

Abstract

The utility model relates to the field of electrical technology, in particular to a GIS partial discharge on-line monitoring device, which comprises a flange plate, a built-in UHF partial discharge sensor and an external UHF partial discharge sensor, the built-in UHF partial discharge sensor and the external UHF partial discharge sensor are respectively arranged on the inner side and the outer side of the flange plate, a junction box is arranged on the outer surface of the flange plate, and the junction box is arranged on the outer surface of the flange plate. The external UHF partial discharge sensor is arranged on the junction box, the built-in UHF partial discharge sensor is arranged on the inner surface of the flange plate, and an external coaxial cable connected to the external UHF partial discharge sensor and an internal coaxial cable connected to the built-in UHF partial discharge sensor both penetrate out of the junction box; the flange plate is provided with three layers, the middle layer is a shielding layer, and the outer layers on the two sides are insulating layers. The utility model provides a GIS partial discharge on-line monitoring device, which effectively reduces the influence of external environment discharge and the stability of a sensor on a monitoring result.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a GIS partial discharge online monitoring device. Background Technology

[0002] The GIS partial discharge online monitoring device is an important device used to monitor and analyze the partial discharge signals inside gas-insulated switchgear (GIS) equipment. It monitors the partial discharge signals inside the GIS equipment through partial discharge sensors. After the signals are processed by filtering and amplification, they are transmitted to the data acquisition device (IED) for digital processing. The processed data is uploaded to the data analysis system for centralized analysis, display, and alarm output.

[0003] Currently, GIS partial discharge online monitoring devices using UHF partial discharge sensors are the mainstream trend in the industry, characterized by high sensitivity and strong anti-interference capabilities. Even so, UHF partial discharge sensors are still susceptible to interference from external discharge signals, and long-term operation can affect their stability and reliability.

[0004] Therefore, there is an urgent need for a new type of GIS partial discharge online monitoring device to provide an effective solution to the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a GIS partial discharge online monitoring device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A GIS partial discharge online monitoring device includes a flange, a built-in UHF partial discharge sensor, and an external UHF partial discharge sensor. The built-in and external UHF partial discharge sensors are respectively disposed on the inner and outer sides of the flange. A junction box is provided on the outer surface of the flange, and the external UHF partial discharge sensor is disposed on the junction box. The built-in UHF partial discharge sensor is disposed on the inner surface of the flange. The external coaxial cable connected to the external UHF partial discharge sensor and the internal coaxial cable connected to the built-in UHF partial discharge sensor both pass through the junction box. The flange is configured with three layers: the middle layer is a shielding layer, and the outer layers on both sides are insulating layers.

[0008] Furthermore, the built-in UHF partial discharge sensor has an outwardly protruding central cylinder at its center. The central cylinder is an insulating cylinder, and a discharge electrode is installed inside the central cylinder. The wire at the tail of the discharge electrode also passes through the junction box, and the discharge electrode is connected to the ion generator through the wire.

[0009] Furthermore, the outer side of the discharge electrode is covered with an insulating cover of a hemispherical shell structure, and an insulating cover shielding layer is provided on the inner surface of the insulating cover.

[0010] Furthermore, an openable and closable insulating shielding cover is rotatably mounted on the detection window of the external UHF partial discharge sensor.

[0011] Furthermore, the insulating shielding cover is opened and closed by a servo motor mounted on the outer wall of the external UHF partial discharge sensor.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model effectively eliminates the interference of external discharge signals on the detection values ​​of the built-in UHF partial discharge sensor by setting an external UHF partial discharge sensor and activating it when an abnormal discharge quantity is detected inside the GIS, thereby improving the accuracy of the monitoring data.

[0014] 2. This utility model uses a discharge electrode to perform weak discharge periodically and compares the discharge amount with that detected by the built-in UHF partial discharge sensor. This allows for precise verification of the sensor's sensitivity, ensuring that the built-in UHF partial discharge sensor always remains in optimal working condition. This reduces false alarms or missed alarms caused by sensor malfunctions and improves the operational safety of GIS equipment. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a GIS partial-displacement online monitoring device from the front view;

[0016] Figure 2 This is a structural exploded diagram of a GIS localized online monitoring device from the bottom view.

[0017] Figure 3 This is a schematic diagram of the insulating cover.

[0018] Figure 4 This is a schematic diagram of the flange structure;

[0019] Figure 5 This is a schematic diagram of an external UHF partial discharge sensor.

[0020] In the diagram: 1. Flange; 2. Shielding layer; 3. Insulation layer; 4. Built-in UHF partial discharge sensor; 5. Center cylinder; 6. Discharge electrode; 7. Wire; 9. Insulation cover; 10. Insulation cover shielding layer; 11. Junction box; 13. Coaxial cable; 14. External UHF partial discharge sensor; 15. Insulation shielding cover. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figures 1-5 A GIS partial discharge online monitoring device includes a flange 1, a built-in UHF partial discharge sensor 4, and an external UHF partial discharge sensor 14. The built-in UHF partial discharge sensor 4 and the external UHF partial discharge sensor 14 are respectively disposed on the inner and outer sides of the flange 1. A junction box 11 is provided on the outer surface of the flange 1. The external UHF partial discharge sensor 14 is disposed on the junction box 11, and the built-in UHF partial discharge sensor 4 is disposed on the inner surface of the flange 1. The external coaxial cable 13 connected to the external UHF partial discharge sensor 14 and the internal coaxial cable 13 connected to the built-in UHF partial discharge sensor 4 both pass through the junction box 11. The flange 1 is configured with three layers: the middle layer is a shielding layer 2, and the outer layers on both sides are insulating layers 3.

[0023] An openable and closable insulating shielding cover 15 is rotatably mounted on the detection window of the external UHF partial discharge sensor 14.

[0024] The insulating shielding cover 15 is opened and closed by a servo motor installed on the outer wall of the external UHF partial discharge sensor 14.

[0025] Working principle of this embodiment:

[0026] In this embodiment, the working principle of the GIS partial discharge online monitoring device is based on the coordinated operation of the built-in UHF partial discharge sensor 4 and the external UHF partial discharge sensor 14. During normal monitoring, the built-in UHF partial discharge sensor 4 continuously monitors the partial discharge signal inside the GIS equipment. After filtering and amplification, the signal is transmitted to the data acquisition device (IED) for digital processing via the internal coaxial cable 13. The processed data is uploaded to the data analysis system for centralized analysis and display. When the built-in UHF partial discharge sensor 4 detects that the discharge amount inside the GIS exceeds a preset threshold, the system determines that there may be external discharge interference or an anomaly inside the GIS. At this time, the system activates the external UHF partial discharge sensor 14 for detection. The servo motor controls the opening of the insulating shielding cover 15, exposing the external UHF partial discharge sensor 14 to the external environment. The external UHF partial discharge sensor 14 detects the discharge signal in the external environment and transmits it to the data acquisition device (IED) for processing via the external coaxial cable 13. During non-detection periods, the insulating shielding cover 15 remains closed to protect the external UHF partial discharge sensor 14 from external environmental influences and extend its service life.

[0027] The data analysis system compares the detection data from the built-in UHF partial discharge sensor 4 and the external UHF partial discharge sensor 14 to determine whether the discharge signal originates from inside or outside the GIS. If the discharge signal is determined to originate from outside, interference with the detection values ​​of the built-in sensor is eliminated; if an abnormal discharge is determined to exist inside the GIS, an alarm message is output.

[0028] Flange 1 is designed with a three-layer structure, with the middle layer being a shielding layer 2 and the outer layers on both sides being insulating layers 3. This design effectively prevents external discharge signals from affecting the interior of the GIS and ensures the normal operation of the GIS equipment.

[0029] This embodiment effectively eliminates the interference of external discharge signals on the detection values ​​of the built-in UHF partial discharge sensor 4 by setting an external UHF partial discharge sensor 14 and activating it when an abnormal discharge quantity is detected inside the GIS, thereby improving the accuracy of the monitoring data.

[0030] Example 2: Please refer to Figures 1-2 A GIS partial discharge online monitoring device differs from Embodiment 1 in that the built-in UHF partial discharge sensor 4 has an outwardly protruding central cylinder 5 at its center. The central cylinder 5 is an insulating cylinder, and a discharge electrode 6 is installed inside the central cylinder 5. The wire 7 at the tail of the discharge electrode 6 also passes through the junction box 11, and the discharge electrode 6 is connected to the ion generator through the wire 7.

[0031] The outer side of the discharge electrode 6 is covered with an insulating cover 9 with a hemispherical shell structure, and an insulating cover shielding layer 10 is provided on the inner surface of the insulating cover 9.

[0032] In this embodiment, the central cylinder 5 serves as an insulating cylinder, located at the center of the built-in UHF partial discharge sensor 4 and protruding outwards. The main function of the central cylinder 5 is to provide an insulating environment to protect the internal discharge electrode 6 from interference from external electric fields and ensure the safe operation of the discharge process. Installed inside the central cylinder 5, its tail is connected to the ion generator via a wire 7. The discharge electrode 6 is a key component for generating weak discharges; it performs periodic weak discharges within a safe range according to the instructions of the ion generator. The necessary electrical energy is supplied to the discharge electrode 6 via the wire 7 to trigger the weak discharge. The ion generator operates periodically, ensuring that the discharge quantity remains within a safe range and does not affect the normal operation of the GIS equipment. The insulating cover 9 adopts a hemispherical shell structure, covering the outside of the discharge electrode 6. Its main function is to further isolate the external electric field, protect the discharge electrode 6 from interference, and ensure the stability and safety of the discharge process. Located on the inner surface of the insulating cover 9, it enhances the shielding effect of the insulating cover and further reduces the influence of external electric fields on the discharge electrode 6.

[0033] This embodiment uses periodic weak discharges performed by the discharge electrode 6 and compares the result with the discharge amount detected by the built-in UHF partial discharge sensor 4 to accurately verify the sensor's sensitivity. This method is more direct and accurate than traditional verification methods, and can promptly detect and resolve issues related to decreased sensor sensitivity. Regular verification and maintenance ensure that the built-in UHF partial discharge sensor 4 remains in optimal operating condition, thereby improving its reliability and stability. This helps reduce false alarms or missed alarms caused by sensor failure, improving the operational safety of GIS equipment.

Claims

1. A GIS partial discharge online monitoring device, comprising a flange (1), a built-in UHF partial discharge sensor (4), and an external UHF partial discharge sensor (14), characterized in that: The built-in UHF partial discharge sensor (4) and the external UHF partial discharge sensor (14) are respectively set on the inner and outer sides of the flange (1). A junction box (11) is provided on the outer surface of the flange (1). The external UHF partial discharge sensor (14) is set on the junction box (11). The built-in UHF partial discharge sensor (4) is set on the inner surface of the flange (1). The external coaxial cable (13) connected to the external UHF partial discharge sensor (14) and the internal coaxial cable (13) connected to the built-in UHF partial discharge sensor (4) both pass through the junction box (11). The flange (1) is configured with three layers: the middle layer is a shielding layer (2), and the outer layers on both sides are insulating layers (3).

2. The GIS partial-displacement online monitoring device according to claim 1, characterized in that: The built-in UHF partial discharge sensor (4) has an outwardly protruding central cylinder (5) at its center. The central cylinder (5) is an insulating cylinder. A discharge electrode (6) is installed inside the central cylinder (5). The wire (7) at the tail of the discharge electrode (6) also passes through the junction box (11). The discharge electrode (6) is connected to the ion generator through the wire (7).

3. The GIS partial-displacement online monitoring device according to claim 2, characterized in that: The discharge electrode (6) is covered by an insulating cover (9) with a hemispherical shell structure on its outer side, and an insulating cover shielding layer (10) is provided on the inner surface of the insulating cover (9).

4. The GIS partial-displacement online monitoring device according to claim 1, characterized in that: An openable and closable insulating shielding cover (15) is rotatably mounted on the detection window of the external UHF partial discharge sensor (14).

5. A GIS partial-displacement online monitoring device according to claim 4, characterized in that: The insulating shield cover (15) is opened and closed by a servo motor installed on the outer wall of the external UHF partial discharge sensor (14).

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