CN201266218Y

CN201266218Y - Terminal device for monitoring and metering distribution transformer

Info

Publication number: CN201266218Y
Application number: CNU2008201648933U
Authority: CN
Inventors: 周忠祥; 蒙根; 邵柳东
Original assignee: Ningbo Sanxing Electric Co Ltd
Current assignee: Ningbo Sanxing Medical and Electric Co Ltd
Priority date: 2008-09-24
Filing date: 2008-09-24
Publication date: 2009-07-01
Anticipated expiration: 2018-09-24

Abstract

A distribution transformer mentoring and metering terminal device comprises a power control module, a display module, a communication module, a CPU module 1, a memory element and a metering unit 2, wherein the CPU module 1 is electrically connected with the communication module, the display module, the memory element and the power control module; the metering unit 2 comprises a sampling module and an A/D conversion module; the sampling module is electrically connected with a public electric network; the A/D conversion module is electrically connected with the sampling module; and the metering unit 2 also comprises a harmonic analysis module which is respectively electrically connected with the A/D conversion module and the CPU module. The harmonic analysis can be effectively performed by the device and the metering error of the mentoring and metering terminal device can be reduced.

Description

Distributing transformer monitoring measuring terminal device

Technical field

The utility model relates to the transformer control apparatus field, especially relates to the metering and measuring equipment to the 10kv common transformer, specifically is a kind of distributing transformer monitoring measuring terminal device.

Background technology

Substation transformer is meant that voltage is reduced to the transformer of electrical equipment operating voltage.In the life of reality, the transformer of the general indication 10kV of substation transformer electric pressure is a kind of power equipment of high voltage electric energy directly being distributed to low-voltage customer.In urban and rural power grids, along with the raising of resident living level, it is increasing that residential electricity consumption load accounts for the proportion of electric energy total load, and the resident is also more and more higher to the requirement of the stability of power supply quality and power supply.Power supply quality refers generally to the supply voltage quality, and power supply enterprise will consider comprehensively the present situation of resident's load when the planning and design of carrying out the residential block electricity consumption, is the emphasis that power supply enterprise will consider to the supervision of potential device.In the process of reality to transformer control, owing to transformer on every side all is the higher-pressure region, dangerous factor; Particularly around the potential device of commercial power, there is bigger danger.Potential device generally is installed in remote zone, generally all away from residential block or workspace.Before transformer broke down, the staff all can not understand its duty, thereby can not fix a breakdown in real time, even the badly damaged transformer of meeting, caused economic loss.

Along with progress of science and technology, prior art mainly is by a kind of distributing transformer monitoring terminal set to the monitoring of transformer running status, and monitoring terminal is a kind of data acquisition equipment that is installed on the substation transformer outside.Its design feature is: be formed by connecting by CPU module, power supply sampling module, modem module, display module, the input end of CPU module is connected with the output terminal of power supply acquisition module, the input end of display module connects an output terminal of CPU module, and another output terminal of CPU module can be dealt into distribution transforming monitoring backstage by mobile network and wired, radio meter register equipment with service data with data by RS232, RS485 telecommunication circuit, modulator-demodular unit.This type of distributing transformer monitoring terminal set is the conversion of being responsible for whole monitor terminal power supply and outside sampled signal by the power supply sampling module, signal after the conversion is sent to and carries out the A/D sampling processing on the CPU module, signal after the sampling processing is input to display module again, and by three-phase voltage to user side, electric current, sample and obtain the electric current and voltage instantaneous value, just can obtain correspondent voltage by certain algorithm (integral algorithm) again, current effective value, applied power, meritorious, idle, power factor, active energy, the parameter of reactive energy and all kinds of harmonic componentss is monitored the actual loading situation of transformer.By scientific and reasonable reactive-load compensation and distribution management are carried out in the monitoring of transformer actual loading.This distributing transformer monitoring terminal set exists some problems in the application of reality:

In public electric wire net, the harm of harmonic wave is very serious.Distributing transformer monitoring terminal set is by the computational analysis of the DFT in the CPU module (discrete Fourier transformation) circuit to analysis of harmonic in the prior art, harmonic wave belongs to electromagnetic wave, can the monitoring accuracy of distributing transformer monitoring terminal set be impacted, thereby can not carry out frequency analysis effectively, be difficult to grasp the real extent of injury of harmonic wave in the public electric wire net.16 bit processors that adopt A/D, LCD driver module in addition integrated carry out data processing to the data that collect, processing speed is slow, particularly in the processing procedure of carrying out mass data, not only speed is slow in the process that 16 bit processors are handled, and thermal value is big, if the untimely meeting of dispelling the heat makes the inner atomizating phenomenon that produces of the display screen of monitoring terminal.

The utility model content

The technical problems to be solved in the utility model is, overcomes above existing technological deficiency, and a kind of distributing transformer monitoring measuring terminal device is provided, and this device can effectively carry out frequency analysis, reduces monitoring and metering terminal device error in dipping.

Technical solution of the present utility model is, a kind of distributing transformer monitoring measuring terminal device with following structure is provided: it comprises energy supply control module, display module, communication module, the CPU module, storage unit, metering units, described CPU module and communication module, display module, storage unit, energy supply control module is electrically connected, metering units comprises sampling module, the A/D modular converter, described sampling module is electrically connected with public electric wire net, the A/D modular converter is electrically connected with sampling module, described metering units also comprises the frequency analysis module, and described frequency analysis module is electrically connected with A/D modular converter and CPU module respectively.

After adopting above structure, the utility model distributing transformer monitoring measuring terminal device compared with prior art has the following advantages:

The utility model has increased the frequency analysis module newly in metering module, the frequency analysis module is made up of dsp chip, be connected with the A/D modular converter by the SPORT interface that carries, not only the data to the acquisition module collection have very strong handling capacity, in time the real time execution situation of each measurement point of Monitoring Line; And the filter function that has of dsp chip itself, can carry out analysis and filter to harmonic wave effectively, the harmonic wave extent of injury that can accurately reflect user side through the sampling harmonic signal of A/D modular converter conversion, can make the staff take reactive-load compensation in real time, and then reduce the infringement of harmonic wave electric power facility.

As a kind of improvement, the CPU module of the utility model distributing transformer monitoring measuring terminal device comprises host CPU module and secondary CPU module.Adopt two CPU processors can improve distributing transformer monitoring measuring terminal device effectively, realize data processing rapidly and efficiently, the real time monitoring function of distributing transformer monitoring measuring terminal device is further strengthened image data Signal Processing speed.

As further improvement, described frequency analysis module is a dsp chip, and described dsp chip has very strong data throughput capabilities, and is low in energy consumption, and the function of filtering is arranged, and effective filtering signal in the energy analysis and filter electrical network makes monitoring more accurate.

Description of drawings

Accompanying drawing is the circuit side connector block diagram of the utility model distributing transformer monitoring measuring terminal device.

As shown in the figure

1, CPU module, 2, metering units.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

As shown in the figure as can be known, the utility model distributing transformer monitoring measuring terminal device, it comprises energy supply control module, display module, communication module, CPU module 1, storage unit, metering units 2, described CPU module 1 and communication module, display module, storage unit, energy supply control module is electrically connected, metering units 2 comprises sampling module, the A/D modular converter, described sampling module is electrically connected with public electric wire net, the A/D modular converter is electrically connected with sampling module, described metering units 2 also comprises the frequency analysis module, and described frequency analysis module is electrically connected with A/D modular converter and CPU module respectively.

Described sampling module comprises CT sampling and PT sampling.

Described CPU module comprises host CPU module and secondary CPU module, and described frequency analysis module is electrically connected with the CPU module and is meant, the frequency analysis module is electrically connected with the host CPU module.Described host CPU module adopts 32 PowerPc MPC852T processors, and secondary CPU module adopts the ARM7 processor.Described host CPU module comprises and embeds 8XX kernel, CPM module, two communication controller SCCs, SMC, SP1 serial line interface, four 32 bit timing devices, eight external interrupt, display module, Ethernet interface; Described secondary CPU module is made up of the ARM7 processor, can realize that Radio Resource shares, checks meter 485, remote signals monitoring, the cabinet door node that opens the door monitoring.Described host CPU module can realize clock, ferroelectric, network interface, local 232 and the communication operation function.

Described CPU module 1 is electrically connected with storage unit and is meant that the host CPU module in the described CPU module 1 is electrically connected with storage unit.

Described frequency analysis module is a dsp chip.The BF532 that dsp chip adopts Analog company to produce.This DSP have can with the SPORT interface of AD73360LAR seamless link, very strong data throughput capabilities is arranged, low in energy consumption, and the function of filtering is arranged, can the analysis and filter electrical network in effective filtering signal, make monitoring more accurate.

Principle of work of the present utility model is: the each several part annexation as shown in the figure, energy supply control module is converted into direct current output with the electricity of getting by the public electric wire net power taking, to sampling module, display module, CPU module 1, communication module power supply; Sampling module is monitored the each point on the public electric wire net circuit by CT sampling and PT sampling; The voltage and current signal of monitoring is converted to digital signal through the A/D modular converter, digital signal is outputed to the frequency analysis module, by the dsp chip in the frequency analysis module harmonic wave in the circuit is analyzed, filtered, again signal is input to the host CPU module, measure computing, the data after the calculation process are kept in the storage unit.

Claims

1, a kind of distributing transformer monitoring measuring terminal device, it comprises energy supply control module, display module, communication module, CPU module (1), storage unit, metering units (2), described CPU module (1) and communication module, display module, storage unit, energy supply control module is electrically connected, metering units (2) comprises sampling module, the A/D modular converter, described sampling module is electrically connected with public electric wire net, the A/D modular converter is electrically connected with sampling module, it is characterized in that: described metering units (2) also comprises the frequency analysis module, and described frequency analysis module is electrically connected with A/D modular converter and CPU module respectively.

2, distributing transformer monitoring measuring terminal device according to claim 1, it is characterized in that: described CPU module (1) comprises host CPU module and secondary CPU module, described frequency analysis module is electrically connected with the CPU module and is meant, the frequency analysis module is electrically connected with the host CPU module.

3, distributing transformer monitoring measuring terminal device according to claim 1, it is characterized in that: described frequency analysis module is a dsp chip.