CN206450785U - The sensor of monitoring switch cabinet local discharging level - Google Patents

Abstract

The utility model discloses a sensor for monitoring the partial discharge level of a switch cabinet, which comprises a bottom plate used for connecting with the switch cabinet and an insulating medium layer integrally connected with the bottom plate; A horizontal UHF detection module and a transient ground voltage detection module, the UHF detection module and the transient ground voltage detection module are fixed in the dielectric layer and electrically connected to the outside through lead wires. The sensor of the utility model has the functions of ultra-high frequency detection and transient ground voltage detection at the same time. Compared with the hand-held method, since it is fixedly installed on the switch cabinet, it has good stability, high data collection accuracy, and safe and reliable performance. The sensor is fixedly installed on the switch cabinet, and the monitoring result is transmitted to the external monitoring instrument by the lead wire, which reduces manpower and avoids the personal danger of the tester.

Description

Sensors for Monitoring Partial Discharge Levels in Switchgear

technical field

The utility model relates to the technical field of partial discharge monitoring of a switch cabinet, in particular to a sensor for monitoring the partial discharge level of a switch cabinet.

Background technique

When there are insulation defects inside the switchgear, partial discharge will be generated, and the insulation state of the switchgear can be effectively judged by detecting the partial discharge.

Among the current detection methods for partial discharge signals inside switchgear, the ultra-high frequency method combined with the transient ground voltage method is currently a more practical and feasible method for realizing on-line partial discharge monitoring of switchgear. The ultra-high frequency method judges the level of partial discharge by detecting the ultra-high frequency signal generated by the discharge, which has the advantage of being less interfered by adjacent cabinets; the transient ground voltage method has the characteristics of less external interference signals, so the detection system is subject to external interference The impact is small, and the partial discharge detection of electrical equipment can be greatly improved, especially the reliability and sensitivity of online monitoring. These two methods can refer to "Application of Transient Ground Voltage Method and UHF Method in Partial Discharge Detection" by Ma Feiyue et al., published in "Ningxia Electric Power", Issue 4, 2016, pages 34-36.

In the prior art, the UHF method and the transient ground voltage method are used for on-site inspections. The usual operation method is: one or more workers hold the sensors and place them at different positions on the switchgear body. The inspectors need to hold the sensors Put the sensor close to the casing of the device to be detected. Another worker observes testing instruments such as oscilloscopes, spectrum analyzers, or portable testing equipment. The problem existing in the prior art is that since the sensor is held manually by hand, it is easy to affect the detection result due to the shaking of the human hand, thus affecting the validity and accuracy of the detection. In addition, in this detection method, the body of the inspector may directly touch the equipment itself, which has certain potential safety hazards; the distance between the sensor and the detection instrument is far away during the detection, requiring multiple operators to work together, which increases the maintenance cost. workload.

Utility model content

One of the technical problems to be solved by the utility model is to provide a safe and reliable UHF and transient ground voltage two-in-one sensor in long-term operation to ensure detection accuracy and repeatability.

Another technical problem solved by the utility model is to provide a safe sensor, which avoids the potential safety hazards of traditional hand-held sensors. It provides effective protection for equipment and personal safety.

In order to solve the above technical problems, the utility model takes the following technical solutions:

A sensor for monitoring the partial discharge level of a switch cabinet is characterized in that it includes a bottom plate used to connect with the switch cabinet and an insulating dielectric layer integrally connected with the bottom plate; the sensor also includes a sensor for detecting the discharge level The ultra-high frequency detection module and the transient ground voltage detection module are fixed in the dielectric layer and electrically connected to the outside through lead-out lines.

The preferred technical solution of the utility model is that the air probe of the UHF detection module protrudes from the medium layer and faces the cable compartment of the switch cabinet.

The preferred technical solution of the present invention is that the transient ground voltage detection module is attached to the base plate for detecting the transient ground voltage signal.

The preferred technical solution of the present invention is that the dielectric layer is formed by pouring insulators around the UHF detection module and the transient ground voltage detection module.

The preferred technical solution of the present invention is that the lead-out wires include communication wires and power wires, which are respectively fixed by the dielectric layer.

The sensor of the utility model has the following beneficial effects:

The sensor of the utility model has the functions of UHF detection and transient ground voltage detection at the same time. Since it is fixedly installed on the switch cabinet, compared with the hand-held method, it has good stability, high data collection accuracy, and safe and reliable performance. The sensor of the utility model is fixedly installed on the switch cabinet, and the monitoring signal is transmitted to the external monitoring instrument through the lead wire, which reduces manpower and avoids the personal danger of the testing personnel.

In addition, the sensor in one embodiment adopts an insulating material for overall insulation covering casting, so as to improve the overall insulation level and sealing performance of the sensor.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the specific implementation or the prior art.

Fig. 1 is a schematic perspective view of the three-dimensional structure of the sensor for monitoring the partial discharge level of the switchgear provided by this embodiment.

FIG. 2 is a structural block diagram of the sensor shown in FIG. 1 .

detailed description

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

As shown in Figure 1, a sensor for monitoring the partial discharge level of a switch cabinet provided by this embodiment is characterized in that it includes a bottom plate 5 used to connect with the switch cabinet and an insulated body connected integrally with the bottom plate 5 Dielectric layer 3; the sensor also includes a UHF detection module 1 and a transient ground voltage detection module 2 for detecting the discharge level, and the UHF detection module 1 and the transient ground voltage detection module 2 are fixed on the The inside of the dielectric layer 3 is electrically connected to the outside through lead wires 4 . The utility model pair sensor is fixedly installed on the switch cabinet through the screw hole on the bottom plate 5, so that the sensor can be reliably fixed inside the cable compartment of the switch cabinet, and the monitoring result is transmitted to the external monitoring instrument by the lead wire 4, which reduces manpower and avoids testing personal danger to personnel. The sensor of the utility model has the functions of ultra-high frequency detection and transient ground voltage detection at the same time. Compared with the hand-held method, since it is fixedly installed on the switch cabinet, it has good stability, high data collection accuracy, and safe and reliable performance. For the sensor of the utility model, an insulating material is used for overall insulation covering casting, so as to improve the overall insulation level and sealing performance of the sensor.

As a preferred mode, as shown in Figure 1, the air probe 11 of the UHF detection module 1 protrudes from the dielectric layer 12, and faces the cable compartment of the switch cabinet to measure the UHF in the switch cabinet. frequency signal.

As shown in Figure 1, the transient ground voltage detection module 1 is attached on the base plate 5 for detecting the transient ground voltage signal, and the purpose of attaching the transient ground voltage detection module 1 on the base plate 5 is Because the base plate 5 is connected to the switch cabinet, it is convenient for the transient ground voltage detection module 1 to measure the transient ground voltage signal generated during partial discharge.

As a preferred manner, the dielectric layer 3 is formed by pouring insulators around the UHF detection module 1 and the transient ground voltage detection module 2 to provide support for internal components. The lead wires 4 include communication wires and power wires, which are respectively fixed by the dielectric layer 3 . The sensor in this embodiment is covered and casted with insulation as a whole, which improves the overall insulation level and sealing performance of the sensor, and ensures the personal safety of the testers.

The assembly process of the sensor for monitoring the partial discharge level of the switchgear provided in this embodiment is as follows: the base plate 5 is used as the base to play an integral supporting role, and the UHF detection module 1, the transient ground voltage detection module 2 and the lead wires 4, etc. can be fixed in advance by means of screw fixing and other methods to fix the placement orientation. Then an insulating material is used to insulate and cover and cast as a whole to form a dielectric layer 3 integrally connected with the bottom plate 5, and the dielectric layer 3 is a three-dimensional structure. During the test, the measurement signal is output from the lead wire, and the ultra-high frequency signal and transient ground voltage signal generated by the partial discharge in the switchgear detected by the ultra-high frequency sensor and the transient ground voltage sensor are collected.

It should be pointed out that both the ultra-high frequency detection module 1 and the transient ground voltage detection module 2 are the measurement modules in the prior art, and will not be repeated here. For details, please refer to the following documents: Document 1: "GIS Partial Discharge Measurement and Analysis Based on UHF Method" by Sun Shuguang et al., published in "Electrical Measurement and Instrumentation" Issue 4, 2012; Document 2: "Partial Discharge in Switchgear" by Xu Yan Transient Ground Voltage Detection Technology", contained in "Power Supply and Utilization", No. 2, 2011.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (5)

1. A sensor for monitoring the partial discharge level of a switch cabinet, characterized in that, comprising a base plate connected to the switch cabinet and an insulating dielectric layer connected as one with the base plate; The sensor also includes a UHF detection module and a transient ground voltage detection module for detecting the discharge level. Electrically connected to the outside world. 2. The sensor for monitoring the partial discharge level of the switch cabinet according to claim 1, wherein the air probe of the UHF detection module protrudes from the medium layer and faces the cable compartment of the switch cabinet . 3. The sensor for monitoring the partial discharge level of the switchgear according to claim 1 or 2, wherein the transient ground voltage detection module is attached to the base plate for detecting the transient ground voltage signal. 4. The sensor for monitoring the partial discharge level of switchgear as claimed in claim 3, characterized in that, the dielectric layer is formed by pouring insulators around the UHF detection module and the transient ground voltage detection module . 5. The sensor for monitoring the partial discharge level of a switchgear according to claim 3, wherein the lead-out wires include communication wires and power wires, which are respectively fixed by the dielectric layer.