Six-column full-phase voltage limiting device online monitor

Abstract

The utility model relates to the technical field of power grid monitoring, and discloses an online monitor for a six-column full-phase voltage limiting device, which comprises a high-precision digital collector and an intelligent display unit, and is characterized in that the high-precision digital collector is mounted on a grounding wire of a six-column overvoltage protector in series and used for collecting leakage current signals and discharge current signals; the high-precision digital collector is connected in series with a grounding wire of the six-column overvoltage protector, then collected current signals are transmitted to the central processing unit through the isolation conversion unit, the central processing unit records and transmits processed data to the intelligent display unit, and the high-precision digital collector is connected in series with the grounding wire of the six-column overvoltage protector to dynamically monitor leakage current and discharge times of the six-column overvoltage protector. According to different phase relations of six-phase leakage currents of the six-column type overvoltage protector, six-phase center point imbalance (phase-to-phase and phase-to-ground) leakage currents are measured, and early faults of the six-column type overvoltage protector can be judged through sensitive characteristics of neutral point currents.

Description

Technical Field

[0001] This utility model relates to the field of power grid monitoring technology, specifically to an online monitoring instrument for a six-column full-phase voltage limiting device. Background Technology

[0002] For the power supply system of industrial and mining enterprises, it is necessary to effectively monitor the number of surge arrester operations, predict abnormal situations before accidents, provide a basis for enterprises to reasonably arrange equipment maintenance and repair, reduce equipment failure rate, and ensure normal power supply to production equipment.

[0003] Existing enterprises generally use ordinary passive discharge counters (active discharge counters), which are electrical devices connected in series below the surge arrester to record the number of times the surge arrester operates. When the lightning current passes through the surge arrester and enters the discharge counter, part of the current flows to ground through a nonlinear resistor, and the other part charges the capacitor through another nonlinear resistor. After the surge current passes, the capacitor discharges to the counter, causing the counter to operate.

[0004] Typical passive discharge counters have limited data storage capacity and relatively simple data query methods. Data can usually only be obtained by viewing the counter display on-site. They cannot monitor multiple electrical parameters such as three-phase voltage and current in real time, cannot achieve remote data transmission and centralized management, are not convenient for comprehensive analysis and management of data from multiple counters, and are not suitable for use in intelligent substations.

[0005] To address the aforementioned issues, there is an urgent need to design an innovative online monitoring instrument to solve the technical problems. Utility Model Content

[0006] To address the existing technical problems of being unable to monitor multiple electrical parameters such as three-phase voltage and current in real time, being unable to achieve remote data transmission and centralized management, and being inconvenient for comprehensive analysis and management of data from multiple counters, this utility model provides an online monitoring instrument for a six-column full-phase voltage limiting device.

[0007] This utility model is achieved using the following technical solution: an online monitoring instrument for a six-column full-phase voltage limiting device, comprising a high-precision digital acquisition unit and an intelligent display unit. The high-precision digital acquisition unit is connected in series on the grounding wire of the six-column overvoltage protector. The high-precision digital acquisition unit is used to acquire the leakage current signal and discharge current signal of the six-column overvoltage protector. The current signal acquired by the high-precision digital acquisition unit is transmitted to the central processing unit via an isolation conversion unit. The central processing unit is used to record the number of times the six-column overvoltage protector operates and the leakage current. The central processing unit is electrically connected to the intelligent display unit, and the central processing unit records the processed data and transmits it to the intelligent display unit.

[0008] Preferably, the number of high-precision digital acquisition devices is set to six, and the six high-precision digital acquisition devices are respectively installed on the valve plates of the six-column overvoltage protector that are grounded for phases A, B, C, AB, AC and BC.

[0009] Preferably, the intelligent display unit can measure the unbalanced leakage current at the center point of the six phases based on the different phase relationships of the six-phase leakage currents of the six-column overvoltage protector.

[0010] Preferably, the intelligent display unit is used to display the leakage current of the six-column overvoltage protector.

[0011] Preferably, when the current value measured by the intelligent display unit exceeds the threshold, the intelligent display unit outputs an alarm signal.

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

[0013] In use, this invention connects a high-precision digital acquisition unit in series with the grounding wire of a six-column overvoltage protector. The intelligent display unit dynamically monitors the leakage current of the six-column overvoltage protector and records the number of discharges. Based on the different phase relationships of the six-phase leakage currents of the six-column overvoltage protector, the unbalanced leakage current at the six-phase center point (measured separately between phases and between phase and ground) is measured. The sensitive characteristics of the neutral point current can be used to determine early faults in the six-column overvoltage protector. It is also equipped with an RS485 communication interface, which facilitates the integration of a comprehensive automation system and is suitable for use in intelligent substations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall process of this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0016] Example 1: Please refer to Figure 1 This embodiment of an online monitoring instrument for a six-column full-phase voltage limiting device includes a high-precision digital acquisition unit and an intelligent display unit. The high-precision digital acquisition unit is connected in series on the grounding wire of the six-column overvoltage protector. The high-precision digital acquisition unit is used to acquire the leakage current signal and discharge current signal of the six-column overvoltage protector. The current signal acquired by the high-precision digital acquisition unit is transmitted to the central processing unit through an isolation conversion unit to record the number of times the six-column overvoltage protector operates and the leakage current. The central processing unit is electrically connected to the intelligent display unit, and the central processing unit records and processes the data and transmits it to the intelligent display unit.

[0017] Furthermore, the number of high-precision digital acquisition devices is set to six, and the six high-precision digital acquisition devices are respectively installed on the grounded valve plates of the six-column overvoltage protector A phase, B phase, C phase, AB phase, AC phase and BC phase.

[0018] Furthermore, the intelligent display unit can measure the unbalanced leakage current at the six-phase center point based on the different phase relationships of the six-phase leakage current of the six-column overvoltage protector. Through the sensitive characteristics of the neutral point current, it can determine the early fault of the six-column overvoltage protector.

[0019] Furthermore, the intelligent display unit is used to display the leakage current of the six-column overvoltage protector. When the current value measured by the intelligent display unit exceeds the threshold, the intelligent display unit triggers an alarm. The current has extremely high alarm sensitivity. For example, if an early fault occurs in a certain phase of the six-column overvoltage protector, the leakage current will increase. Therefore, it can very sensitively determine whether the six-column overvoltage protector is working properly.

[0020] The intelligent display unit allows for real-time monitoring of leakage current, viewing of discharge counts and discharge times, and setting of alarm thresholds via its panel.

[0021] The online monitoring instrument for the six-column full-phase voltage limiting device of the present invention can sensitively and accurately measure the leakage current and discharge count of the six-column overvoltage protector. The monitor has accurate counting, large storage capacity, and intelligent query capability. Through the RS485 communication interface, it can realize multi-machine communication or communication with a host computer, making it suitable for use in intelligent substations.

[0022] Working principle: By connecting a high-precision digital acquisition unit in series with the grounding wire of the six-column overvoltage protector, the intelligent display unit dynamically monitors the leakage current of the six-column overvoltage protector and records the number of discharges. Based on the different phase relationships of the six-phase leakage current of the six-column overvoltage protector, the unbalanced leakage current at the six-phase center point is measured. The sensitive characteristics of the neutral point current can be used to determine the early fault of the six-column overvoltage protector. It is also equipped with an RS485 communication interface, which facilitates the integration of a comprehensive automation system and is suitable for use in intelligent substations.

[0023] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An online monitoring instrument for a six-column full-phase pressure limiting device, comprising a high-precision digital data acquisition unit and an intelligent display unit, characterized in that, The high-precision digital acquisition unit is connected in series on the grounding wire of the six-column overvoltage protector. The high-precision digital acquisition unit is used to acquire the leakage current signal and discharge current signal of the six-column overvoltage protector. The current signal acquired by the high-precision digital acquisition unit is transmitted to the central processing unit through the isolation conversion unit. The central processing unit is used to record the number of times the six-column overvoltage protector operates and the leakage current. The central processing unit is electrically connected to the intelligent display unit. The central processing unit records the processed data and transmits it to the intelligent display unit.

2. The online monitoring instrument for a six-column full-phase pressure limiting device according to claim 1, characterized in that, The number of high-precision digital acquisition devices is set to six, and the six high-precision digital acquisition devices are respectively installed on the grounded valve plates of the six-column overvoltage protector A phase, B phase, C phase, AB phase, AC phase and BC phase.

3. The online monitoring instrument for a six-column full-phase pressure limiting device according to claim 2, characterized in that, The intelligent display unit can measure the unbalanced leakage current at the center point of the six phases based on the different phase relationships of the six-phase leakage currents of the six-column overvoltage protector.

4. The online monitoring instrument for a six-column full-phase pressure limiting device according to claim 3, characterized in that, The intelligent display unit is used to display the leakage current of the six-column overvoltage protector.

5. The online monitoring instrument for a six-column full-phase pressure limiting device according to claim 3, characterized in that, When the current value measured by the intelligent display unit exceeds the threshold, the intelligent display unit outputs an alarm signal.

Images