CN211426687U

CN211426687U - Partial discharge monitoring device

Info

Publication number: CN211426687U
Application number: CN201922097655.6U
Authority: CN
Inventors: 钟守平; 郭自刚; 张琦雪; 王光; 陈俊; 陈佳胜
Original assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Current assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-09-04
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a partial discharge monitoring device, which comprises a power supply module, a CPU module, a DSP module, a partial discharge signal module, a power frequency current signal module and a GPS time tick signal module, wherein the modules are all connected with a bus; the power frequency current signal module comprises a first conditioning circuit and a second conditioning circuit, and the first conditioning circuit and the second conditioning circuit are connected with the zero-crossing detection circuit through a first control switch; the partial discharge signal module comprises a third conditioning circuit, a fourth conditioning circuit and a fifth conditioning circuit; the third conditioning circuit, the second conditioning circuit, the third conditioning circuit, the fourth conditioning circuit and the fifth conditioning circuit are connected with the AD sampling chip through a second control switch; zero crossing detection circuitry and AD sampling chip connect, the utility model discloses can monitor the partial discharge type of difference.

Description

Partial discharge monitoring device

Technical Field

The utility model belongs to the technical field of discharge monitoring, especially, relate to a partial discharge monitoring devices.

Background

Partial discharge is a strong field effect in insulating media and is of great importance in the fields of dielectric phenomena and electrical insulation. The dielectric can cause the aging and the breakdown of the electrical performance under the action of partial discharge, and the influence on the insulation is not negligible. The local discharge capacity of the equipment is monitored in real time, the abnormal condition of the equipment is discovered as soon as possible, the maintenance is foreseen, the running time of the equipment can be effectively prolonged, and the power failure fault loss is reduced. A large number of studies have shown that different partial discharge types have a large difference in the degree of insulation damage. The method has the advantages that effective mode recognition is carried out on the local discharge signals, the insulation defect types in the cable can be further accurately known, and a basis is provided for making a proper maintenance plan and timely eliminating faults. The monitoring of the partial discharge signal and the identification of the fault mode both depend on the acquisition of a partial discharge signal and a power frequency current phase signal of equipment, the types of the partial discharge signals to be monitored in different application occasions are different, the partial discharge signals can be one or more of high-frequency CT sensor signals, ultrahigh-frequency sensor signals and ultrasonic sensor displacement signals, different peripheral circuits need to be matched for monitoring different partial discharge signal types, the peripheral circuits corresponding to the partial discharge signal types have larger difference, and the actual operation is very inconvenient.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a partial discharge monitoring devices can insert the current signal of different partial discharge types.

The utility model provides a partial discharge monitoring devices, include: the system comprises a power supply module, a CPU module, a DSP module, a partial discharge signal module, a power frequency current signal module and a GPS time tick signal module, wherein the power supply module, the CPU module, the DSP module, the partial discharge signal module, the power frequency current signal module and the GPS time tick signal module are all connected with a bus; the power frequency current signal module comprises a first conditioning circuit and a second conditioning circuit, and the first conditioning circuit and the second conditioning circuit are connected with the zero-crossing detection circuit through a first control switch; the partial discharge signal module comprises a third conditioning circuit, a fourth conditioning circuit and a fifth conditioning circuit; the third conditioning circuit, the second conditioning circuit, the third conditioning circuit, the fourth conditioning circuit and the fifth conditioning circuit are connected with the AD sampling chip through a second control switch; the zero crossing point detection circuit is connected with the AD sampling chip.

Further, the CPU module includes a CPU and an ethernet controller, which are electrically connected.

Furthermore, an optical port is arranged on the ethernet controller, and the two partial discharge monitoring devices are connected through the optical port.

Furthermore, two partial discharge monitoring devices complete clock synchronization by adopting an IEEE1588 protocol through an optical port.

Furthermore, a sealing cover is arranged outside the device, and the waterproof grade is IP 68.

Furthermore, the partial discharge signal module, the power frequency current signal module and the GPS time tick signal module are integrated into a plug-in unit.

Has the advantages that: the utility model discloses a set up a plurality of conditioning circuit and make monitoring devices can compatible acquire the current signal of multiple sensors such as high frequency CT sensor signal, superfrequency sensor signal and ultrasonic sensor, only need to switch through control switch can to the current signal of difference.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is the structure schematic diagram of the middle partial discharge module and the power frequency current module of the present invention.

Detailed Description

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

As shown in fig. 1-2, the utility model provides a partial discharge monitoring device, include: the system comprises a power supply module, a CPU module, a DSP module, a partial discharge signal module, a power frequency current signal module and a GPS time tick signal module, wherein the power supply module, the CPU module, the DSP module, the partial discharge signal module, the power frequency current signal module and the GPS time tick signal module are all connected with a bus; the power frequency current signal module comprises a first conditioning circuit and a second conditioning circuit, and the first conditioning circuit and the second conditioning circuit are connected with the zero-crossing detection circuit through a first control switch; the partial discharge signal module comprises a third conditioning circuit, a fourth conditioning circuit and a fifth conditioning circuit; the third conditioning circuit, the second conditioning circuit, the third conditioning circuit, the fourth conditioning circuit and the fifth conditioning circuit are connected with the AD sampling chip through a second control switch; the zero crossing point detection circuit is connected with the AD sampling chip.

In order to prevent the device from being filled with water, a sealing cover is arranged outside the device, and the waterproof grade is IP 68.

For convenience of installation, the partial discharge signal module, the power frequency current signal module and the GPS time tick signal module are integrated into a plug-in unit.

When the local discharge monitoring device is used, the power supply plug-in supplies power to each module, and due to the fact that the frequency spectrum of the local discharge telecommunication signals is wide, different signal sensors can be adopted according to different monitoring scenes and requirements (different local discharge types), for example, ultrahigh frequency sensors are usually used in GIS and transformer local discharge, and the signals are not easily interfered; aiming at the partial discharge of the cable, monitoring by adopting high-frequency CT; in GIS and transformer partial discharge monitoring with higher fault positioning accuracy requirements, an ultrasonic sensor is generally adopted for monitoring. Aiming at the different partial discharge types, the partial discharge monitoring device selects a corresponding conditioning circuit through the second control switch, selects the third conditioning circuit through the second control switch (jumper) when the sensor accessed by the device is an ultrahigh frequency sensor, selects the fourth conditioning circuit through the second control switch when the device is accessed by a high frequency CT, and selects the fifth conditioning circuit through the control switch when the device is accessed by an ultrasonic sensor. The partial discharge signal is sent to an AD sampling chip after being processed by a conditioning circuit (a third conditioning circuit to a fifth conditioning circuit), the device simultaneously collects a power frequency current signal, the power frequency current signal is a power current signal of the device or a current signal of a Rogowski coil (the Rogowski coil is directly arranged on monitored equipment, power frequency current flows through the Rogowski coil, the current signal of the monitoring equipment is collected on some sites without passing through the Rogowski coil, and the device collects the current signal of the device at the moment). Selecting a corresponding conditioning circuit according to the collected different current signals through a first control switch (jumper); when the current signal is a power supply current signal of the device, the control switch is switched and connected with the first conditioning circuit, when the current signal is a current signal of the Rogowski coil, the control switch is switched and connected with the second conditioning circuit, the current passes through the zero crossing point monitoring circuit, the original sine wave signal is converted into a square wave signal, the jumping edge of the square wave signal is 0 degree of the current signal, and the AD acquisition of the partial discharge signal is triggered at the moment. The first to fifth conditioning circuits and the zero crossing point detection circuit adopted in the device are all in the prior art. The DSP module processes the partial discharge signals collected within a period of time to form a PRPD partial discharge map for fault diagnosis, in addition, more than two partial discharge monitoring devices are usually installed for positioning in order to facilitate fault troubleshooting of a user, and the distance difference between a partial discharge position and different discharge devices can be determined by monitoring the time difference of partial discharge monitored by different devices, so that the position of partial discharge is finally determined.

Fault location usually needs two monitoring devices (location actually is the distance of pointing out different partial discharge devices of fault point distance), and two partial discharge monitoring devices need to carry out the time setting of high accuracy, mainly have two kinds of modes: 1. the Ethernet controllers of the two partial discharge monitoring devices are provided with optical ports, the two monitoring devices are connected through the optical ports, and high-precision clock synchronization is completed through an IEEE1588 protocol; 2. the two partial discharge monitoring devices synchronize the time source through the GPS.

The embodiment is only for explaining the technical thought of the utility model, can not limit with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.

Claims

1. A partial discharge monitoring device is characterized by comprising a CPU module, a DSP module, a partial discharge signal module, a power frequency current signal module and a GPS time tick signal module, wherein the modules are all connected with a bus; the power frequency current signal module comprises a first conditioning circuit and a second conditioning circuit, and the first conditioning circuit and the second conditioning circuit are connected with the zero-crossing detection circuit through a first control switch; the partial discharge signal module comprises a third conditioning circuit, a fourth conditioning circuit and a fifth conditioning circuit; the third conditioning circuit, the second conditioning circuit, the third conditioning circuit, the fourth conditioning circuit and the fifth conditioning circuit are connected with the AD sampling chip through a second control switch; the zero crossing point detection circuit is connected with the AD sampling chip.

2. The partial discharge monitoring device of claim 1 wherein the CPU module comprises a CPU and an ethernet controller electrically connected to each other.

3. The partial discharge monitoring device according to claim 2, wherein the ethernet controller is provided with an optical port, and two partial discharge monitoring devices are connected through the optical port.

4. The partial discharge monitoring device of claim 3, wherein the two partial discharge monitoring devices use IEEE1588 protocol to complete clock synchronization through the optical port.

5. The partial discharge monitoring device of claim 2, wherein a sealing cover is arranged outside the device, and the waterproof grade is IP 68.

6. The partial discharge monitoring device of claim 1, wherein the partial discharge signal module, the power frequency current signal module and the GPS time tick signal module are integrated into a plug-in unit.