Secondary voltage drop/secondary load on-line monitoring device and system and monitoring method thereof

Abstract

The invention discloses a secondary voltage drop / secondary load on-line monitoring device and system and a monitoring method thereof. The on-line monitoring device comprises a first communication unit which is used for receiving measurement data, a microprocessor which is used for calculation processing and overall control, a multipath selection unit which is used for selecting access signals which need measurement and sending the access signals to a signal conditioning unit, the signal conditioning unit which is used for conditioning the access signals and carrying out sending to a first frequency multiplication unit, the first frequency multiplication unit which is used for carrying out frequency multiplication on conditioned signals and sending the conditioned signals after frequency multiplication to an analog-to-digital conversion unit, the analog-to-digital conversion unit which is used for sampling the signals to acquire sampling signals, a second communication unit which is used for receiving a control instruction of a front-end processor and sending test data to the front-end processor and a keyboard input unit which is used for inputting a field control instruction into the microprocessor. According to the invention, real-time on-line monitoring can be carried out on load, error and other main parameters of a metering device; manual field measurement is not needed; the workload is reduced; and the work efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage power grid measurement, in particular to a secondary voltage drop / secondary load online monitoring device and system and a monitoring method thereof. Background technique [0002] High-voltage electric energy metering devices in power plants and substations are related to the interests of power generation, transmission, and distribution. High-voltage electric energy metering devices are usually composed of voltage transformers (PTs), current transformers (CTs) and electric energy meters. The comprehensive error of meter metering device is composed of PT error, CT error, error caused by PT secondary voltage drop and error of electric energy meter. In order to ensure accurate measurement, it is very necessary to verify each error link of substation. [0003] At present, the verification of each error link of the electric energy metering device in the substation generally uses various portable o...

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Problems solved by technology

[0003] At present, the verification of each error link of the electric energy metering device in the substation generally uses various portable on-site error testers for periodic verification. This method cannot monitor the errors of each link of the electric energy metering device in operation in real time. If a problem occurs, the measurement will lose its fairness and cause the loss of electricity. Moreover, when the traditional portable on-site tester tests the errors of each link of the electric energy metering device on the spot, each error is measured in time-sharing and isolated and irrelevant, so it is impossible to measure the electric energy in real time. The comprehensive error of the metering device, and the manual on-site measurement workload is large, the work efficiency is low, and the real-time performance is poor

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