CN211086494U

CN211086494U - GIS built-in partial discharge detector capable of being detached in electrified mode

Info

Publication number: CN211086494U
Application number: CN201921773337.0U
Authority: CN
Inventors: 曹立峰; 叶海峰
Original assignee: Jiangsu Lide Intelligent Monitoring Technology Co ltd
Current assignee: Jiangsu Lide Intelligent Monitoring Technology Co ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-07-24
Anticipated expiration: 2029-10-21

Abstract

The utility model relates to a detector has the effect that can dismantle with electricity. The utility model discloses a built-in partial discharge detector of GIS that can dismantle with electricity, including fixing the flange in GIS's installation hand hole, be provided with the insulating barrier who is used for seal installation hand hole on the flange one, be provided with the sensor that is used for detecting the partial discharge signal in the hand hole, installation hand hole is provided with the mounting flange that is used for fixed sensor outward. With the help of the cooperation of insulating barrier and installation hand hole, realized the operation that can dismantle of sensor under GIS equipment charged state.

Description

GIS built-in partial discharge detector capable of being detached in electrified mode

Technical Field

The utility model relates to a detector, more specifically say that it relates to a built-in partial discharge detector of GIS that can dismantle with electricity.

Background

Partial discharge is the main reason causing the premature failure of the insulation of the power equipment, and also reflects the representation of the insulation degradation of the equipment, and the monitoring of the partial discharge can timely find the insulation defect possibly existing in the power equipment, thereby avoiding the insulation breakdown accident. The Ultra High Frequency (UHF) method has recently become a main means for detecting partial discharge of power equipment due to its advantages of High sensitivity, strong anti-interference capability, capability of identifying and locating a discharge source, and the like.

The precondition for detecting the ultrahigh frequency partial discharge of the power equipment is that the sensor can collect ultrahigh frequency electromagnetic wave signals. For GAS insulated metal enclosed switch (GAS insulated SWITCHGEAR, GIS), transformer, switch cabinet and other equipment, the electric field signal cannot penetrate the metal shell due to the electromagnetic shielding effect of the metal shell. The traditional partial discharge ultrahigh frequency sensor converts an electric field into a voltage signal by inducing the change of a space electric field, and realizes the detection and identification of the partial discharge ultrahigh frequency signal.

At present, for UHF partial discharge detection of the GIS, a sensor is generally arranged outside a basin-type insulator or is pre-arranged inside the GIS. Comparatively speaking, the installation of the former kind of mode is comparatively nimble, but because GIS insulator leaks signal strength comparatively faintly, and receives external electromagnetic interference's influence easily, and the SNR of actual detected signal is difficult to promote, the later kind of mounting means, the sensor is installed in GIS handhole department and is shielded external electromagnetic interference through the metal flange dish, can effectively promote detected signal's SNR, nevertheless because it belongs to the invasive installation, the installation need have a power failure with the maintenance installation, restricted its application, there is the problem that can't dismantle with electricity.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a but built-in partial discharge detector of GIS of electrified dismantlement has the effect that can dismantle with electricity.

In order to achieve the technical purpose, the utility model provides a following technical scheme: the built-in partial discharge detector of GIS capable of being detached in an electrified mode comprises a first flange fixed in a mounting hand hole of the GIS, wherein an insulating partition plate used for sealing the mounting hand hole is arranged on the first flange, a sensor used for detecting a partial discharge signal is arranged in the hand hole, and a mounting flange used for fixing the sensor is arranged outside the mounting hand hole.

Through adopting above-mentioned technical scheme, seal GIS's installation hand hole with the help of insulating barrier, and insulating barrier is the sheet metal that plastics were made, and the UHF electromagnetic wave signal that arouses when GIS internal insulation fault takes place can pass insulating barrier, is fully collected by the sensor, has effectively promoted the SNR of detected signal. When the sensor needs to be disassembled for maintenance, the GIS does not need to be powered off, and the sensor is disassembled in a charged manner.

Preferably, the insulating spacer has a relative dielectric constant of between 2.0 and 13.0.

By adopting the technical scheme, the relative dielectric constant represents the dielectric property or the physical parameter of the polarization property of the dielectric material. The value is equal to the ratio of the capacitance of the capacitor with the same size made by taking the predicted material as the medium and taking the vacuum as the medium, and the value is also the representation of the power storage capacity of the material. The physical sealing and the electromagnetic wave signal non-blocking can be simultaneously realized when the relative dielectric constant is in a specified range, and the material requirement difficulty is reduced.

Preferably, an O-shaped groove is formed in the first flange, a first sealing ring is arranged between the first flange and the mounting hand hole, and the first sealing ring is clamped in the O-shaped groove.

By adopting the technical scheme, after the first flange is fixed on the mounting hand hole, the first sealing ring deforms after being extruded by the first flange and the mounting hand hole, a gap between the first flange and the mounting hand hole is sealed, and the sealing performance of the GIS is guaranteed.

Preferably, a second sealing ring is arranged on the mounting flange, a flange plate matched with the mounting flange through bolts is arranged outside the mounting hand holes, and the second sealing ring is clamped between the mounting flange and the flange plate.

By adopting the technical scheme, the second sealing ring deforms after being extruded by the mounting flange and the flange plate, and a gap between the mounting flange and the flange plate is filled, so that the sealing performance of the detector is further ensured.

Preferably, the sensor is electrically connected to the controller by a coaxial connector having a characteristic impedance of 50 ohms to 75 ohms.

By adopting the above technical solution, the rf coaxial connector is generally considered as a component attached to a cable or mounted on an instrument as a component to which a transmission line is electrically connected or separated. It belongs to a mechatronic product. Simply say that it mainly plays the bridge effect, can guarantee the complete transmission of sensor detection signal, avoid the signal accuracy poor.

To sum up, the utility model discloses following effect has been gained:

1. by means of the matching of the insulating partition plate and the mounting hand hole, the sensor can be detached in a GIS equipment live state;

2. and the sealing performance of the mounting hand hole is ensured by means of the matching of the first sealing ring and the second sealing ring.

Drawings

Fig. 1 is a schematic diagram for showing the overall structure in this embodiment.

In the figure, 1, GIS; 11. mounting hand holes; 12. a flange plate; 2. a first flange; 21. a first sealing ring; 3. an insulating spacer; 4. a sensor; 5. installing a flange; 51. and a second sealing ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Example (b): a GIS1 built-in partial discharge detector capable of being detached in an electrified mode is shown in figure 1 and comprises a flange I2 fixed in a mounting hand hole 11 of a GIS1, an insulating partition plate 3 used for sealing the mounting hand hole 11 is arranged on the flange I2, a sensor 4 used for detecting a partial discharge signal is arranged in the hand hole, and a mounting flange 5 used for fixing the sensor 4 is arranged outside the mounting hand hole 11. The installation hand hole 11 of the GIS1 is sealed by the insulating partition plate 3, the insulating partition plate 3 is a thin plate made of plastic, UHF electromagnetic wave signals excited when insulation fault occurs in the GIS1 can penetrate through the insulating partition plate 3 and are fully collected by the sensor 4, and the signal-to-noise ratio of detection signals is effectively improved. When the sensor 4 needs to be disassembled for maintenance, the GIS1 does not need to be powered off, and the sensor 4 is disassembled in a charged mode.

The insulating spacer 3 has a relative dielectric constant of between 2.0 and 13.0. The relative permittivity characterizes a physical parameter of the dielectric or polarization properties of the dielectric material. The value is equal to the ratio of the capacitance of the capacitor with the same size made by taking the predicted material as the medium and taking the vacuum as the medium, and the value is also the representation of the power storage capacity of the material. The relative dielectric constant is in a specified range, and the physical sealing and the electromagnetic wave signal non-blocking can be simultaneously realized.

As shown in fig. 1, an O-shaped groove is formed in the flange one 2, a first sealing ring 21 is arranged between the flange one 2 and the mounting hand hole 11, the first sealing ring 21 is clamped in the O-shaped groove, and after the flange one 2 is fixed on the mounting hand hole 11, the first sealing ring 21 deforms after being extruded by the flange one 2 and the mounting hand hole 11, so that a gap between the flange one 2 and the mounting hand hole 11 is sealed, and the sealing performance of the GIS1 is guaranteed.

As shown in fig. 1, a second sealing ring 51 is arranged on the mounting flange 5, a flange 12 which is in bolt fit with the mounting flange 5 is arranged outside the mounting hand hole 11, the second sealing ring 51 is clamped between the mounting flange 5 and the flange 12, and the second sealing ring 51 deforms after being squeezed by the mounting flange 5 and the flange 12 to fill a gap between the mounting flange 5 and the flange 12.

The sensor 4 is electrically connected to the controller by a coaxial connector having a characteristic impedance of 50-75 ohms, and the radio frequency coaxial connector is generally considered to be a component attached to a cable or mounted on an instrument as a component to which a transmission line is electrically connected or separated. It belongs to a mechatronic product. Simply, it mainly plays the bridge effect, can guarantee the complete transmission of sensor 4 detected signal, avoids the signal accuracy poor.

Claims

1. The utility model provides a built-in partial discharge detector of GIS that can dismantle with electricity which characterized in that: including fixing flange (2) in the installation hand hole (11) of GIS (1), be provided with insulating barrier (3) that are used for sealed installation hand hole (11) on flange (2), the downthehole sensor (4) that are used for detecting the partial discharge signal that are provided with of hand, installation hand hole (11) are provided with mounting flange (5) that are used for fixed sensor (4) outward.

2. The detachable GIS built-in partial discharge detector according to claim 1, characterized in that: the relative dielectric constant of the insulating spacer (3) is between 2.0 and 13.0.

3. The detachable GIS built-in partial discharge detector according to claim 2, characterized in that: an O-shaped groove is formed in the first flange (2), a first sealing ring (21) is arranged between the first flange (2) and the mounting hand hole (11), and the first sealing ring (21) is clamped in the O-shaped groove.

4. The detachable GIS built-in partial discharge detector according to claim 3, characterized in that: be provided with sealing washer two (51) on mounting flange (5), be provided with flange dish (12) with mounting flange (5) bolt fit outside mounting hand hole (11), sealing washer two (51) clamp is between mounting flange (5) and flange dish (12).

5. The detachable GIS built-in partial discharge detector according to claim 4, wherein: the sensor (4) is electrically connected with the controller through a coaxial connector, and the characteristic impedance of the coaxial connector is 50-75 ohms.