CN2844930Y

CN2844930Y - Portable electric power malfunction monitor

Info

Publication number: CN2844930Y
Application number: CN 200520067092
Authority: CN
Inventors: 邓宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-15
Filing date: 2005-11-15
Publication date: 2006-12-06
Anticipated expiration: 2015-11-15

Abstract

The utility model discloses a portable electric power malfunction monitor. The utility model comprises a central processing unit, a data acquisition unit and a memory unit, wherein the data acquisition unit and the memory unit are respectively connected to the central processing unit, and a liquid crystal screen and a short message sending and receiving module which are respectively connected to the central processing unit are arranged in the portable electric power malfunction monitor. The utility model uses the short message sending and receiving module and sends out short messages for alarm through a GSM mobile communication network; thereby, the utility model has the advantages of quick feedback speed and stable work. A liquid crystal display module is used, thereby, the entire information of malfunction waveforms can be directly observed on the monitor. Meanwhile, malfunction files can be transferred to a PC, and software is used for the implementation of further analysis and backup.

Description

The portable power trouble-monitoring instrument

Technical field

The utility model relates to digital electric power fault monitoring device, relates in particular to a kind of portable power trouble-monitoring instrument.

Background technology

The power failure monitor is used for detecting and correct record electricity system exception running status.When system's operation is broken down or big disturbance occurred; fault monitoring device can be according to the record ripple starting conditions of external signal or software set, automatic production record voltage, electric current, frequency, variable power and the protective device at that time and the overall process of switchgear action.

By this record, engineering technical personnel can understand the variation tendency of each electric parameter in the transient state process of electric power system, and find out failure cause and trouble spot.In addition, present fault monitoring device also is used to check the action behavior of protective relaying device and safe automatic system.

Along with the application of the computer technology that begins the eighties in electric system, the power failure monitoring device has obtained developing rapidly, becomes system safety operation indispensable " black box ", has brought into play important effect in the investigation and analysis of many major accidents.

At present, the power failure monitoring device generally includes ingredients such as CPU (central processing unit) (CPU), data acquisition unit, memory cell and fault alarm unit.Its CPU (central processing unit) adopts single-chip microcomputer mostly, and its degree of integration is not high, so unreliable products performance is bulky; Realize that fault warning is to adopt modes such as sound and light signal, LAN (Local Area Network) mostly, though can play the purpose of " sending warning information ", its intuitive and real-time have much room for improvement; Data store dual mode: deposit local hard drive in or be sent to monitoring center by network, this dual mode all is unsuitable for portable set.

The utility model content

At the shortcoming of prior art, the purpose of this utility model provides a kind of portable power trouble-monitoring instrument.

To achieve these goals, the technical solution of the utility model is: a kind of portable power trouble-monitoring instrument, comprise CPU (central processing unit) and the data acquisition unit, the memory cell that are connected with described CPU (central processing unit) respectively, also be provided with the display screen and the sending and receiving short messages module that are connected with described CPU (central processing unit) respectively in the described portable power trouble-monitoring instrument.

Described CPU (central processing unit) is a high speed digital signal processor.

Described memory cell is made up of static data storer of using as metadata cache and the USB flash disk of storing usefulness in support.

Described data acquisition unit comprises analog quantity modulate circuit, switching value isolation sample circuit and time keeping circuit.

Described analog quantity modulate circuit is made up of electric weight isolation sensor and operational amplifier modulate circuit.

Compared with prior art: the utility model is owing to adopt high high-end digital signal processing (DPS) chip of integrated level to carry out the nucleus module design, so its peripheral circuit is simple, overall volume is little, is easy to carry; Send note owing to adopt the sending and receiving short messages module by the GSM mobile communications network and alarm, so its feedback speed is fast, working stability; The USB flash disk that has adopted the USB interface technology is a storage medium, so fault data can carry easily, backs up in good condition on host computer; Adopt LCD MODULE, on monitor, can directly observe the full detail of fault waveform; Simultaneously can be to PC the fault file conversion, utilize software to be further analyzed and back up.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is that electric weight of the present utility model is isolated sensing circuit figure.

Fig. 3 is operational amplifier modulate circuit figure of the present utility model.

Fig. 4 is that switching value of the present utility model is isolated sampling interface circuit figure.

Fig. 5 is real-time clock power supply of the present utility model and interface circuit figure.

Fig. 6 is USB flash disk module for reading and writing interface circuit figure of the present utility model.

Fig. 7 is SRAM interface circuit figure of the present utility model.

Embodiment

See also Fig. 1, the portable power trouble-monitoring instrument of present embodiment comprises CPU (central processing unit) and the data acquisition unit that is connected with CPU (central processing unit) respectively, memory cell, CPU (central processing unit) is high speed digital signal processor (DSP), data acquisition unit comprises the analog quantity modulate circuit, switching value is isolated sample circuit and time keeping circuit, memory cell is made up of static data storer of using as metadata cache and the USB flash disk of storing usefulness in support, also is provided with human-machine interface module and sending and receiving short messages modules such as the keyboard that is connected with CPU (central processing unit) respectively and LCD screen in the portable power trouble-monitoring instrument.The analog quantity modulate circuit is connected with high speed digital signal processor by the I/O interface, and switching value is isolated sample circuit and is connected with high speed digital signal processor by the A/D interface, and the time keeping circuit passes through I ²The C bus is connected with high speed digital signal processor; The sending and receiving short messages module is connected with high speed digital signal processor by the SCI serial port; Human-machine interface module such as keyboard and LCD screen is connected with high speed digital signal processor by data bus; USB flash disk is connected with USB interface by usb bus, and USB interface is connected with high speed digital signal processor by data bus.

CPU (central processing unit) is the core of total system running, so choosing of device also is very fastidious.This part adopts the high-end digital signal processing of TI company (DPS) chip TMS320F2812, and its characteristic and this instrument require comparatively identical:

(1) travelling speed of processing speed height: 30～150M can be carried out high speed acquisition and stores processor to fault data;

(2) 32 bit data width kernels can carry out various high-accuracy digital signal Processing Algorithm;

(3) inner integrated 16 tunnel 12 A/D converters, the demand of suitable electric power system fault monitoring device multi-channel sampling;

(4) 32 digital I/O, and possess the automatic filter function, the shake of filtering switching value effectively;

(5) outside maximum address space reaches 2M * 16b, can connect mass storage (RAM) and carry out the fault data buffer memory, can control LCD MODULE and usb interface module again simultaneously; Dual serial communication port (SCI) is received and dispatched note data.

Owing to need mass data is carried out high speed acquisition during monitor work, and carry out the storage of high precision fault judgement and Wave data, therefore storer should satisfy the while capacious, also will satisfy certain read or write speed, and closes the preservation that the back data can be complete in the monitor working power.Therefore adopt high-speed SRAM to do buffering, high capacity U disc is the reserve memory device.Facts have proved that this kind scheme has bigger advantage on reduction cost of development and raising performance.

As an intelligentized instrument, except that can stable operation, friendly user interface and use-pattern is equally very important easily.The Domestic Electric fault monitoring device mostly existed and used defectives such as complicated, that the interface is not directly perceived in the past, and data must pass to host computer analysis by other means such as LAN (Local Area Network), seldom possessed fault waveform or online data observing function.And external product as the failure wave-recording instrument of Siemens, all has been equipped with big screen LCD (LCD), and this also becomes the key factor that the domestic brand fault monitoring device is lacked competitiveness.For this reason, the author has also done a large amount of effort in this regard when these works of design, realized functions such as online wave shape playback, data presentation.LCD screen adopts the YXD-240128V1 model, and its built-in T6963C controller can directly be articulated in this module on the data bus and control.Keyboard adopts universal scan formula circuit, totally 24 keys.Comprising: numerical key, directionkeys, affirmation and cancel key, and have 8 soft keys, corresponding with the shortcut on the LCD screen.So-called " soft key " is meant that its function is uncertain, determined under certain specific run mode by detector, corresponding to 8 small icons in LCD screen right side.

The sending and receiving short messages module is responsible for sending failure message and is accepted the Remote order.In order to make the instrument working stability, the specific implementation of function has adopted integrated short message transceiving module JB35G.This module can be controlled with the baud rate of 9600b/s by the serial communication port (SCI bus) of dsp chip.Because the work of module must be passed through the particular communication network operation, so adopted the China Mobile GSM network of signal stabilization to communicate.When fault took place, product can send to failure message on the mobile phone that reaches 12 users at once, and notification technique personnel reach the spot and carry out diagnosis and maintenance.Though the remote alarm function is also arranged on the product of some company, but all be that information is beamed back control center by GPRS network, this mode is proper for the network type monitoring, but this product is " portable " equipment, and the direct type of alarm of this kind " instrument is to the technician " is more suitable.This equipment can also be communicated by letter by the GSM network technology, so this product can carry out: mobile phone remote switching on and shutting down, SMS starting detector wave recording and client enjoy functions such as online service by monitor.

See also Fig. 2, for the general 110V of transformer station secondary system rated output voltage, output-current rating is 5A, and this type of strong signal can not directly be handled by dsp system, so the isolation sensing circuit must be arranged.

See also Fig. 3, the signal that is sent by sensor is the AC signal of 4V for the bipolarity effective value, and the A/D converter input voltage range of dsp chip is 0～3V signal.For solving this contradiction, must carry out work such as voltage bias, range ability conversion to sensor signal through operational amplifier.

See also Fig. 4, so-called switching value is meant in the transformer station location status and the situation of change of a large amount of element contacts of using such as isolating switch, disconnector and relay.Therefore can adopt " 0 " of logical signal and " 1 " to represent.But the position of the switch is generally far away apart from the workplace of monitor, therefore need to improve logic level (this instrument adopts the 12V logic level) and could guarantee the antijamming capability of switching signal in transmission, and each deciliter appearance that all is accompanied by big electric current or electric arc of switch.Based on above factor, in order to make the I/O level match of logic level and DSP, and prevent that big electric current from damaging the light current working portion, must with the switching value signal in addition photoelectricity isolate.In the specific implementation, adopted the TLP521-4 photoelectricity coupling chip of TI company.

See also Fig. 5, as the part of fault raw data, the moment that fault takes place is also very important.Because this relates to the correct analysis and the time reckoning of fault data afterwards.As the real-time clock of this instrument, should meet the following conditions:

1. the time adjustable is convenient to corresponding with the time zone of workplace;

2. after the instrument working power was closed, clock still can continue operation.

Therefore, the PCF8563 chip of having selected Philps company is a real-time timepiece chip, and its access interface is I ²The C bus, and adopt the I/O interface of dsp chip to copy this interface sequence to control.For guaranteeing after the instrument working power is closed still can reliability service, having adopted silver oxide cell (button cell) is back-up source.

See also Fig. 6, this part adopts the integrated USB flash disk module for reading and writing of CH375 that the USB flash disk file is managed, it is integrated USB1.1 agreement and USB flash disk file system protocol, and price is cheap, good reliability.

See also Fig. 7, on the type selecting of chip, having adopted IS61LV25616-10T is buffer RAM, and its memory space is 256K * 16b, and it only is 10nS that read-write postpones, and therefore can satisfy the requirement of high speed acquisition, high speed storing.

Claims

1, a kind of portable power trouble-monitoring instrument, it comprises CPU (central processing unit) and the data acquisition unit, the memory cell that are connected with described CPU (central processing unit) respectively, it is characterized in that, also be provided with the liquid crystal display and the sending and receiving short messages module that are connected with described CPU (central processing unit) respectively in the described portable power trouble-monitoring instrument.

2, portable power trouble-monitoring instrument as claimed in claim 1 is characterized in that, described CPU (central processing unit) is a high speed digital signal processor.

3, portable power trouble-monitoring instrument as claimed in claim 1 is characterized in that, described memory cell is made up of static data storer of using as metadata cache and the USB flash disk of storing usefulness in support.

4, portable power trouble-monitoring instrument as claimed in claim 1 is characterized in that, described data acquisition unit comprises analog quantity modulate circuit, switching value isolation sample circuit and time keeping circuit.

5, portable power trouble-monitoring instrument as claimed in claim 4 is characterized in that, described analog quantity modulate circuit is made up of electric weight isolation sensor and operational amplifier modulate circuit.