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Distributed ring main unit monitor terminal

A monitoring terminal and ring network cabinet technology, applied in program control, computer control, comprehensive factory control, etc., can solve the problems of inability to achieve synchronous sampling, inability to achieve synchronous sampling, and a small number of sampling channels, and achieve good built-in anti-aliasing. The effect of stacking performance, compact structure, and simple measurement

Inactive Publication Date: 2009-11-11
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The former has low sampling accuracy and fewer sampling channels, and cannot achieve synchronous sampling, which brings more calculations to the calculation of power, zero-sequence voltage and current; the latter has slightly higher sampling accuracy, but currently the AD sampling of the parallel port is generally used Chip, when there are many measurement channels and multiple ADs need to be cascaded, this solution cannot achieve synchronous sampling

Method used

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  • Distributed ring main unit monitor terminal
  • Distributed ring main unit monitor terminal
  • Distributed ring main unit monitor terminal

Examples

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Embodiment Construction

[0029] see figure 1 , set the microprocessor MCU as DSP digital signal processor 1, and its peripheral settings include CAN communication interface 2, RS232 communication interface 3, RS485 communication interface 4, data storage circuit 9, AC sampling circuit 5, DC sampling circuit 6, digital quantity Input circuit 7, digital output circuit 8 and power supply circuit 10; AC sampling circuit 5 is a signal collector with each current transformer and voltage transformer coupled with the power grid; the monitored signal sampled by the signal collector passes through the filter circuit in turn 1. The capacitive voltage divider circuit inputs multiple cascaded AD sampling chips in differential mode for sampling.

[0030] see figure 2, in the present embodiment, digital signal processor 1 adopts the DSP chip TMS320F2812 that has powerful data processing ability, in order to satisfy the RMU remote measurement data calculation amount is large, the high real-time requirement; Built-...

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Abstract

A distributed ring main unit monitor terminal is characterized in that: a microprocessor MCU is set to be a digital signal processor (DSP), peripherals are composed of a CAN communication interface, an RS 232 communication interface, an RS 485 communication interface, an information storage circuit, an alternating current sample circuit, a direct current sample circuit, a digital input circuit, a digital output circuit and a power supply circuit; wherein, the alternating current sample circuit is provided with a signal acquisition unit which comprises each current transformer(CT) and each pressure transformator(PT), which are coupled with a network; a monitor signal sampled by the signal acquisition unit is transferred in a filter circuit and a capacitance divider circuit and output in a multi-chip cascade AD sampler chip in a differential mode for sampling. A multipath real-time monitoring of the ring main unit monitor terminal can be realized by the invention.

Description

technical field [0001] The invention relates to a monitoring terminal of a ring network cabinet of a power supply system. Background technique [0002] The ring main unit is used in the ring network power supply unit for the distribution and measurement of electric energy, and completes the distribution network fault isolation and restoration of power supply, network optimization, etc. together with the intelligent controller. With the maturity of the ring network power supply technology, the ring network cabinet is widely used due to its small size, compact structure, convenient installation, simple maintenance, safety and reliability, and convenient power supply. In order to meet the needs of different users, the structure and functions of the ring main unit tend to be diversified. With the continuous and rapid development of my country's electric power industry, especially the modernization and transformation of urban and rural power grids, new requirements are put forwar...

Claims

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Application Information

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IPC IPC(8): G05B19/048G05B19/042G05B19/418
CPCY02P90/02
Inventor 陶维青陈雄周俭节
Owner HEFEI UNIV OF TECH
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