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MOA resistive current and CT capacitive current joint monitoring system

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: 2014-02-19
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • MOA resistive current and CT capacitive current joint monitoring system
  • MOA resistive current and CT capacitive current joint monitoring system
  • MOA resistive current and CT capacitive current joint monitoring system

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Embodiment Construction

[0015] The present invention is described in detail below in conjunction with the embodiments shown in the accompanying drawings:

[0016] as attached figure 2 , attached image 3 and attached Figure 4 As shown, a combined MOA resistive current and CT capacitive current monitoring system includes a system host, a soft magnetic clamp 1 connected to the system host signal, and a current transformer connected to the system host signal. The core is connected to the ground terminal of the CT test product, and the current transformer is connected in series with 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 bidirectional communication with the data acquisition unit.

[0017] Specifically, the soft magnetic clamp 1 is equivalent to a through-core current transformer, which does not change the wiring mode of the capacitive test product, but only obtains the capacitive current through t...

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Abstract

The invention discloses an MOA resistive current and CT capacitive current joint monitoring system which comprises a system host, a pair of soft magnetic tweezers in signal connection with the system host and a current transformer in signal connection with the system host, wherein the a penetrating core of the soft magnetic tweezers is connected to the grounding end of an end screen of a CT sample, the current transformer is connected onto a connecting circuit of an MOA sample in series, and the system host comprises a signal conditioning unit for processing signals received by the soft magnetic tweezers and the current transformer, a data acquiring unit for acquiring an output signal of the signal conditioning unit and a PC processor in both-way communication with the data acquiring unit. The MOA resistive current and CT capacitive current joint monitoring system can simultaneously monitor capacitive current of the capacitive sample and resistive current of a lightning arrester, monitor a specific value of the capacitive current to total current of the lightning arrester in real time and avoid fluctuation of voltage values. The multiple-device joint monitoring can be opened up by improving the joint monitoring system and adding a current signal acquiring channel, the shortcomings existing in an existing single monitoring system are effectively overcome, and the joint monitoring system is suitable for popularization and usage in a electric power system.

Description

technical field [0001] The invention relates to a combined monitoring system for MOA resistive current and CT capacitive current. Background technique [0002] Zinc oxide arrester resistive current live test and capacitive current transformer or bushing capacitive current on-line monitoring are two of the many parameters that focus on stable and safe operation of power systems. The current practice is to monitor the two types of equipment separately. [0003] Metal oxide arresters are widely used in power systems because of their superior nonlinear characteristics and current-carrying capacity. Insulation defects such as aging caused by internal damping or long-term exposure to operating voltage and overvoltage of the arrester in operation will lead to an increase in the resistive component of the AC leakage current of the arrester, thereby accelerating the aging process. The resistive current test of the arrester before the thunderstorm season is an important means to ens...

Claims

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Application Information

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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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