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Power distribution transformer monitoring terminal and method for calculating current complex power precision thereof

A technology for distribution transformers and monitoring terminals. It is applied in the direction of electric power measurement, electric variable measurement, and instruments through the application of digital technology. It can solve the problems that cannot fully meet the needs of on-site communication, achieve low maintenance difficulty, reduce investment, and improve accuracy. Effect

Active Publication Date: 2010-06-02
KEDA INTELLIGENT ELECTRICAL TECH +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

There are only one or two asynchronous serial communication interfaces in the digital signal processor DSP chip, which cannot fully meet the needs of on-site communication

Method used

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  • Power distribution transformer monitoring terminal and method for calculating current complex power precision thereof
  • Power distribution transformer monitoring terminal and method for calculating current complex power precision thereof
  • Power distribution transformer monitoring terminal and method for calculating current complex power precision thereof

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Embodiment Construction

[0023] The present invention will be described in detail below with reference to the accompanying drawings.

[0024] figure 1 It is a hardware principle block diagram of the present invention. It includes a digital signal processor DSP (1) and a corresponding power management module (2), an active crystal oscillator module (3) and a watchdog module (4); the three-phase voltage Ua, Ub, Uc passes through the voltage transformer After PT (5) and three-phase current Ia, Ib, Ic pass through current transformer CT (6), enter the analog-to-digital conversion module ADC of described digital signal processor DSP respectively by signal conditioning circuit (7) and sample; The serial communication interface SCI of digital signal processor DSP is connected with the general packet radio service GPRS network communication module (9) that is used for and control main station (8) communication; The internal integrated circuit I of described digital signal processor DSP 2 C bus line is respe...

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Abstract

The invention relates to a power distribution transformer monitoring terminal and a method for calculating the current complex power precision thereof, a three-phase voltage is connected with the signal input end of a signal conditioning circuit by a voltage transformer and a three-phase current is connected with the signal input end of the signal conditioning circuit by a current transformer respectively, the signal output end of the signal conditioning circuit is connected with an analog to digital conversion module in a digital signal processor; the digital signal processor is respectively connected with two asynchronous serial communication interfaces UARTA and UARTB by an external expansion interface chip interactively, the UARTA is interactively connected with an RS485 interface by an electrical level switching chip, and the UARTB is interactively connected with an electric-power line low voltage carrier wave meter reading module. The measuring precision of the three-phase current and the complex power is increased by adopting the fast Fourier transform FFT algorithm. The functions of measuring, monitoring, communication and meter reading are integrated into one body and the precision of calculating the current and the complex power of the power distribution transformer monitoring terminal is increased.

Description

technical field [0001] The invention relates to power system metering, meter reading and monitoring control equipment, that is, a distribution transformer monitoring terminal, which can be used for meter reading and distribution network automation, distribution transformer monitoring, and electric energy management systems, and belongs to the field of distribution network automation. Background technique [0002] With the continuous development of science and technology, the demand for electric energy has put forward higher requirements in terms of quantity and quality. In order to facilitate the management of the power system, usually within a certain area, such as a residential area or an office building, a concentrator is set up to collect the metering data of various metering terminals in the area, and distribution transformers are installed to monitor the operation of the power grid. Monitoring and Control. However, at present, the measurement, monitoring, communicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/25G01R21/133
Inventor 陶维青张巧云李林金冶夫周天兵
Owner KEDA INTELLIGENT ELECTRICAL TECH
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