CN210720633U - GIS partial discharge detection device based on flange bolt - Google Patents

Abstract

The utility model relates to a GIS partial discharge detection device based on flange bolts. The interconnected GIS shell, flanges arranged at both ends of the GIS shell, flange bolts, gaskets, nuts, and pot-type insulators and busbar guide rods respectively arranged inside the GIS shell and connected to each other, the GIS shell The body and the basin insulator are connected to each other through the flange and flange bolts. The gasket and the nut are respectively arranged on both ends of the flange bolt. The pulse current sensor is installed on the side of the flange through the flange bolt. GIS The shell, the flange, the nut, the gasket, the flange bolt and the metal shell of the pulse current sensor form a pulse current flow path. Compared with the prior art, the utility model has the advantages of being suitable for multi-point grounding GIS equipment and the like.

Description

A GIS partial discharge detection device based on flange bolts

technical field

The utility model relates to the field of partial discharge detection of GIS equipment, in particular to a GIS partial discharge detection device based on flange bolts.

Background technique

GIS, namely gas-insulated metal-enclosed switchgear, is a high-voltage electrical equipment with high operational reliability, small maintenance workload, and long maintenance cycle. The power system is very important.

GIS equipment includes functional units such as busbars, circuit breakers, isolating switches, grounding switches, current transformers, voltage transformers and arresters. The GIS equipment adopts SF ₆ gas with high dielectric strength as the insulating medium and the arc extinguishing medium of the circuit breaker, and seals all the high-voltage components in the casing to realize the compactness of the GIS equipment. However, due to the leakage of SF ₆ gas, the infiltration of external moisture, the existence of conductive impurities, and the aging of insulators, internal flashover failures may occur, reducing the insulation performance of GIS equipment.

Operational experience shows that GIS equipment failures caused by reduced insulation performance account for a large proportion of GIS equipment failures. Therefore, in order to prevent system failures due to reduced insulation performance, in actual operation, insulation detection of GIS equipment and real-time monitoring of GIS equipment are carried out. The insulation condition inside the equipment is very necessary. Various potential defects in GIS equipment may lead to different degrees of partial discharge, and long-term discharge will deteriorate the insulation and gradually expand, and even cause the entire insulation breakdown or flashover along the surface, thus posing a great threat to the safe operation of the equipment. , and even system power outages caused by operating failures, resulting in huge losses.

At present, the test of GIS equipment in the power industry mainly focuses on how to find its internal insulation defects, including the AC withstand voltage factory test and the on-site handover AC withstand voltage test, both of which are based on the partial discharge pulse current detection technology of offline GIS equipment. Discharge will cause a pulse current signal to be generated inside it. The pulse current method is the only partial discharge detection technology with international and national standards. The pulse current measured at the neutral point or ground point of the device can be used to obtain information such as the discharge amount, discharge phase, and discharge frequency of the pulse current. The detection technique is shown in Figure 1. This detection technology requires GIS equipment to build a coupling capacitor voltage divider before installation and operation in the laboratory or field, and perform single-point grounding, so that the partial discharge pulse current signal is coupled from the grounding line. However, most of the GIS equipment running live on site is grounded at multiple points, so the partial discharge pulse current detection of GIS equipment cannot be performed using the technology shown in Figure 1.

Utility model content

The purpose of this utility model is to provide a GIS partial discharge detection device based on flange bolts in order to overcome the above-mentioned defects of the prior art.

The purpose of the present utility model can be achieved through the following technical solutions:

A GIS partial discharge detection device based on flange bolts, comprising GIS equipment, a pulse current sensor interconnected with the GIS equipment, and a measurer interconnected with the pulse current sensor, and the GIS equipment includes a plurality of interconnected GIS devices The shell, flanges arranged at both ends of the GIS shell, flange bolts, gaskets, nuts, and basin-type insulators and busbar guide rods respectively arranged inside the GIS shell and connected to each other, the GIS shell and the basin-type insulators are connected to each other through flanges and flange bolts, the gaskets and nuts are respectively arranged at both ends of the flange bolts, and the pulse current sensor is installed on the flange through flange bolts On the side of the disk, the GIS shell, the flange, the nut, the gasket, the flange bolt and the metal casing of the pulse current sensor form a pulse current flow path.

Preferably, the gasket is arranged between the nut and the outer side of the flange, and the pulse current sensor is installed between the outer side of the flange and the gasket.

Preferably, the pulse current flow path sequentially passes through the GIS shell, the flange, the gasket, the nut and the flange bolt on one side of the flange bolt, and then passes through the other side of the flange bolt in sequence. Nuts, gaskets, flanges, the metal shell of the pulse current sensor and the GIS shell, when a partial discharge occurs inside the GIS equipment and a pulse current signal is generated on the GIS shell, the pulse current signal flows along the pulse current flow path, Flow from the GIS shell on one side to the GIS shell on the other side.

Preferably, when the pulse current signal flows from one end of the flange bolt to the other end along the pulse current flow path, it simultaneously passes through the pulse current sensor.

Preferably, one pulse current sensor is provided and installed on one end of a flange bolt.

Preferably, the pulse current sensor is a Rogowski coil HFCT.

Compared with the prior art, the utility model has the following advantages:

1) According to the multi-point grounding GIS equipment of the present invention, there is no insulation between the flanges of the two shells in series with each other, and the Rogowski coil is installed between the flanges and the gasket through the characteristics of the conduction through the fixing bolts. HFCT uses the pulse current flow path of the two GIS shells at the flange connection to directly measure the pulse current without single-point grounding. The problem that the pulse current detection of partial discharge of GIS equipment cannot be carried out;

2) The present utility model installs the Rogowski coil HFCT based on flange bolts, and the installed Rogowski coil HFCT is an external type, which is easy to install and does not destroy the original sealing structure and internal insulation design of the GIS equipment, and can be used in existing systems. Installed under the operation and maintenance guidelines;

3) The measuring device in the present utility model can select live detection equipment or online monitoring equipment. When online detection equipment is selected, by maintaining the connection between the coaxial cable and the Rogowski coil HFCT, real-time monitoring of the pulse current flow path in the GIS equipment is performed. The pulse current signal is generated without affecting the normal operation of the GIS equipment, and the adaptability and practicability of the device of the present invention are improved.

Description of drawings

1 is a schematic diagram of an existing off-line GIS partial discharge pulse current detection device;

Fig. 2 is the principle schematic diagram of the utility model;

Fig. 3 is the single pulse current waveform generated by the partial discharge of the burr defect at the tip of the GIS guide rod collected by the utility model;

FIG. 4 is a PRPD spectrum generated by the partial discharge of the burr defect at the tip of the GIS guide rod collected by the utility model.

Among them, 1, pulse current sensor (Rogowski coil HFCT), 2, gasket, 3, nut, 4, flange bolt, 5, GIS shell, 6, pulse current flow path, 7, basin insulator, 8 , Bus guide rod, 9, coaxial cable, 10, measuring instrument, 11, flange.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in FIG. 2, the present utility model provides a GIS partial discharge detection device based on flange bolts, generally including a flange 10, a pulse current sensor (Rogowski coil HFCT) 1, a gasket 2, a nut 3, a bolt , GIS shell 5, basin insulator 7, bus bar guide rod 8, coaxial cable 9 and measuring instrument 10, GIS shell 5, flange 10, nut 3, gasket 2 and flange bolt 4 are formed together For the pulse current flow path 6, the specific positions and connections of each component are described below:

A plurality of GIS shells 5 are connected in series with each other, flanges 11 are provided at both ends of the GIS shell 5, the basin insulator 7 and the busbar guide rod 8 are arranged in the GIS shell 5 and are connected to each other, and the basin insulator 7 passes through the flange. The plate 10 and the flange bolts 4 are connected to the GIS shell 5, and the gaskets 2 and nuts 3 are respectively arranged on both ends of the flange bolts 4 to ensure the sealing performance of the GIS equipment, thus forming the GIS equipment, the Rogowski coil HFCT As the pulse current sensor 1, it is installed on the outer side of the flange 10 through the flange bolts 4. After the installation is completed, the positional relationship between the flange 10, the gasket 2, the Rogowski coil HFCT 1 and the nut 3 is: nut 3 A gasket 2 is arranged between the gasket 2 and the flange 10 , and a pulse current sensor 1 is arranged between the gasket 2 and the flange 10 . Make the pulse current flow path 6 formed by the GIS shell 5, the flange 10, the nut 3, the gasket 2, the metal shell of the pulse current sensor 1 and the flange bolt 4 pass through the pulse current sensor 1, and the pulse current sensor 1 is connected to the measuring device 10 through the coaxial cable 9.

In this embodiment, only one pulse current sensor 1 is provided at one end of one of the flange bolts 4 .

The pulse current flow path 6 passes through the GIS shell 5, the flange 10, the gasket 2, the nut 3 and the flange bolt 4 on one side of the flange bolt 4 in sequence, and then passes through the flange bolt 4 on the other side. The nut 3, the gasket 2, the flange 10, the metal shell of the pulse current sensor 1 and the GIS shell 5, when a partial discharge occurs inside the GIS equipment and a pulse current signal is generated on the GIS shell 5, the pulse current The signal flows along the pulse current flow path 6 and flows from the GIS shell 5 on one side to the GIS shell 5 on the other side. When the pulse current signal flows along the pulse current flow path 6 from one end of the flange bolt 4 to the other. At one end, it passes through the pulse current sensor 1 at the same time, and the pulse current sensor 1 converts the pulse current signal into a voltage signal.

The working characteristics of the pulse current sensor 1 meet the requirements of the partial discharge pulse current method: when the detection frequency band is less than 1M, the conventional pulse current method is used; when the detection frequency band is 3MHz-30MHz, the high-frequency pulse current method is used. The size parameters of the pulse current sensor 1 are matched with the size of the gasket 2, the nut 3 and the bolt.

The single-point grounding method is that one end of each segment of the GIS shell is insulated, and the other end is grounded at a single point. Generally, structurally, the two shells in series are insulated at the flange, and the shell and the ground are insulated. Insulation is provided between the housing supports. The multi-point grounding method is to use more than two points of multi-point grounding conductors to connect the shell and the earth in a certain segment of the GIS shell. Generally, in terms of structure, the shell support is not insulated, and the two shells connected in series There is no insulation between the flanges, and the fixing bolts are used for conduction.

The main principle of the present utility model is: the partial discharge generated by the internal defects of the GIS equipment will pass through the capacitance existing between the bus bar guide rod 8 and the casing, and generate a weak pulse current signal on the GIS shell 5, and the pulse current signal will pass through the After the GIS shell 5, the flange 10, the gasket 2, the nut 3 and the flange bolt 4 on one side of the flange bolt 4, pass through the nut 3 and the gasket on the other side of the flange bolt 4 in turn. The sheet 2 finally flows to the GIS housing 5 on the other side of the flange 10, thereby forming a passage. Therefore, if the pulse current sensor 1 is installed on the bolt, the pulse current signal can be converted into a voltage signal, and then transmitted to the measuring device 10 to form a partial discharge pulse current charging detection and online monitoring device for GIS equipment based on the flange bolt 4 .

The working principle of the utility model is as follows:

1) The partial discharge inside the GIS equipment generates a pulse current signal on the GIS shell 5;

2) The pulse current signal flows from the GIS shell 5 on one side to the GIS shell 5 on the other side along the pulse current flow path 6, and flows through the pulse current sensor 1, which converts the pulse current signal into a voltage Signal;

4) The voltage signal is transmitted to the measuring device 10 through the coaxial cable 9;

5) The measuring device 10 measures the parameters of the received voltage signal, and detects the partial discharge in the GIS equipment according to the parameters of the voltage signal.

In this embodiment, the measuring device 10 is a live detection device, which is used to perform patrol detection on the partial discharge pulse current signal of the GIS equipment. During the patrol inspection, the measuring device 10 is connected to the pulse current sensor 1 through the coaxial cable 9 to collect pulses. The current sensor 1 converts the pulse current signal into a voltage signal, and when the operation ends, the coaxial cable 9 is disconnected from the pulse current sensor 1 .

Example 2

In this embodiment, the measuring device 10 is an online monitoring device, which is used for online monitoring of the partial discharge pulse current signal of the GIS equipment. The measuring device 10 is always connected to the pulse current sensor 1 through the coaxial cable 9, and the pulse current sensor is monitored in real time. 1 Convert the pulsed current signal into a voltage signal.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person familiar with the technical field can easily think of various Equivalent modifications or replacements should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (6)

1. a GIS partial discharge detection device based on flange bolts, comprising GIS equipment, a pulse current sensor interconnected with the GIS equipment and a measuring device (10) interconnected with the pulse current sensor, and the GIS equipment includes multiple a GIS shell (5) connected to each other, flanges (11) arranged at both ends of the GIS shell (5), flange bolts (4), gaskets (2), nuts (3), and flanges (11) arranged at both ends of the GIS shell (5), respectively. The pot-type insulator (7) and the busbar guide rod (8) are connected to each other inside the GIS shell (5), and the GIS shell (5) and the pot-type insulator (7) pass through the flange (11) and The flange bolts (4) are connected to each other, and the gasket (2) and the nut (3) are respectively arranged on both ends of the flange bolt (4). The flange bolt (4) is installed on the side of the flange (11), the GIS shell (5), the flange (11), the nut (3), the gasket (2), the flange bolt (4) and the metal casing of the pulse current sensor (1) form a pulse current flow path (6). 2. A GIS partial discharge detection device based on flange bolts according to claim 1, wherein the gasket (2) is arranged outside the nut (3) and the flange (11) Between the side surfaces, the pulse current sensor (1) is installed between the outer side surface of the flange (11) and the gasket (2). 3. a kind of GIS partial discharge detection device based on flange bolts according to claim 2, is characterized in that, described pulse current flow path (6) passes through the GIS on one side of flange bolts (4) successively After the shell (5), the flange (11), the gasket (2), the nut (3) and the flange bolt (4), pass the nut on the other side of the flange bolt (4) in turn. (3), the gasket (2), the flange (11), the metal casing of the pulse current sensor (1) and the GIS casing (5), when partial discharge occurs inside the GIS equipment, the GIS casing (5) will generate When a pulse current signal is used, the pulse current signal flows along the pulse current flow path (6), and flows from the GIS casing (5) on one side to the GIS casing (5) on the other side. 4. a kind of GIS partial discharge detection device based on flange bolts according to claim 3, is characterized in that, described pulse current signal is along the pulse current flow path (6) from the flange bolt (4) When one end flows to the other end, it passes through the pulse current sensor (1) at the same time. 5. a kind of GIS partial discharge detection device based on flange bolts according to claim 4, is characterized in that, described pulse current sensor (1) is provided with one, is installed on the flange bolt (4) one end. 6 . The GIS partial discharge detection device based on flange bolts according to claim 5 , wherein the pulse current sensor ( 1 ) is a Rogowski coil HFCT. 7 .

Images