The combined monitoring system of moa resistive current and ct capacitive current

A technology of capacitive current and joint monitoring, applied in the direction of measuring current/voltage, measuring device, measuring electric variable, etc.

Active Publication Date: 2016-09-28
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this concept is that the working reliability of the ammeter connected in series should be quite high, otherwise there may be some adverse effects caused by the ammeter disconnection

Method used

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  • The combined monitoring system of moa resistive current and ct capacitive current
  • The combined monitoring system of moa resistive current and ct capacitive current
  • The combined monitoring system of moa resistive current and ct capacitive current

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Experimental program
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Embodiment Construction

[0015] Below in conjunction with the embodiment shown in the accompanying drawings, the present invention is described in detail as follows:

[0016] as attached figure 2 , attached image 3 and attached Figure 4 As shown, a combined monitoring system of MOA resistive current and CT capacitive current, the system includes a system host, a soft magnetic clamp 1 connected to the system host signal, a current transformer connected to the system host signal, and the soft magnetic clamp 1 wears The core is connected to the terminal grounding terminal of the CT test product, and the current transformer is connected in series to the connection circuit of the MOA test product. A data acquisition unit for the output signal of the conditioning unit, and a PC processor for two-way communication with the data acquisition unit.

[0017] Specifically, the soft magnetic pliers 1 is equivalent to a core-through current transformer, which does not change the wiring mode of the capacitive ...

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Abstract

The invention discloses a joint monitoring system of MOA resistive current and CT capacitive current, which includes a system host, a soft magnetic clamp connected to the signal of the system host, a current transformer connected to the signal of the system host, and a soft magnetic clamp connected to the CT through the core. The terminal of the test product is connected to the ground terminal, and the current transformer is connected in series to the connection circuit of the MOA test product. The system host includes a signal conditioning unit for processing the signals received by the soft magnetic clamp and the current transformer, and collecting the output signal of the signal conditioning unit. The data acquisition unit and the PC processor with two-way communication with the data acquisition unit. The capacitive current of the capacitive test product and the resistive current of the arrester can be monitored at the same time, and the ratio of the capacitive current to the full current of the arrester can be monitored in real time to avoid voltage fluctuations. By improving the joint monitoring system and adding current signal acquisition channels, the joint monitoring of more equipment can be expanded, which can effectively solve the disadvantages of the existing single monitoring system, and is suitable for popularization and use in power systems.

Description

technical field [0001] The invention relates to a joint monitoring system of MOA resistive current and CT capacitive current. Background technique [0002] The resistive current live test of the zinc oxide arrester and the capacitive current online monitoring of the capacitive current transformer or bushing are two of the many parameters that focus on the stable and safe operation of the power system. The current practice is to monitor the two types of equipment separately. [0003] Metal oxide surge arresters are widely used in power systems because of their superior nonlinear characteristics and flow capacity. Insulation defects such as internal moisture or long-term exposure to operating voltage and overvoltage of the arrester in operation will cause the resistive component in the AC leakage current of the arrester to increase, thereby accelerating the aging process. It is an important means to ensure the safe and reliable operation of zinc oxide arresters to conduct re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 徐青龙邹铁张曦徐建波周文华侍海军
Owner STATE GRID CORP OF CHINA
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