CN201682272U

CN201682272U - Filter capacitor monitoring protection device

Info

Publication number: CN201682272U
Application number: CN2010201764791U
Authority: CN
Inventors: 黄新波; 李小博
Original assignee: Xian Polytechnic University
Priority date: 2010-04-30
Filing date: 2010-04-30
Publication date: 2010-12-22
Anticipated expiration: 2020-04-30

Abstract

The utility model discloses a filter capacitor monitoring protection device which comprises a DSP, wherein the DSP is connected with a data acquisition module, a relay, an LCD, a wireless module, keys and a GPS; an inverter power supply is respectively connected with the DSP, the GPS, the data acquisition module, the LCD and the wireless module. The filter capacitor monitoring protection device can realize various relay protection functions, modularization and intellectualization, also can make rapid and accurate response and action towards each fault. The filter capacitor monitoring protection device not only can realize conventional protections, but also can realize certain additional functions, such as fault recording, unified time checking, and timely uploads data to professional software for data preparation and processing. The filter capacitor monitoring protection device adopts wireless communication technology to communicate with computer, is not limited by physical space, is protected against electromagnetic field interference in high voltage environment, and well solves the wireless communication problem of the monitoring protection device and the computer.

Description

The filtering capacitor monitoring and protecting device

Technical field

The utility model belongs to the Microcomputer Protection technical field, is specifically related to a kind of filtering capacitor monitoring and protecting device.

Background technology

In constituting the electric power system series of key techniques, filter occupies crucial status.Harmonic wave is one of public hazards of electric power system, and the existence of harmonic wave in electrical network can make generator, transformer produce supplementary load loss, vibration and noise, and shell is overheated with some securing member, and might be caused that the transformer part is seriously overheated.Also overvoltage might occur, cause device damage.In addition, harmonic wave can make induction motor, compensation condenser and overhead wire, cable produce additional thermal effect; Also can make some electric equipments produce mechanical oscillation, cause relay misoperation work, interfere with communications etc.The filtering capacitor purpose is for the filtering harmonic wave, and then in order to guarantee the operate as normal of filtering capacitor.

In digital microcomputer protecting device; at first will be converted into digital signal for various types of input signals (generally including the signal of types such as analog quantity, switching value, pulsed quantity), realize monitoring and relaying protection function in real time by processing then these digital signals.Digital protection equipment not only can be realized complicated protection principle that other protective devices are difficult to realize, improve the performance of relaying protection; and can provide such as simplify debugging and adjust, senior miscellaneous functions such as self operating state supervision, accident record and analysis; can also finish the tasks such as various intelligent measurings, control, communication and management of power automation requirement, also have good cost performance simultaneously.

Summary of the invention

The purpose of this utility model provides a kind of filtering capacitor monitoring and protecting device, has solved in the existing electric power system because the existence of harmonic wave, causes the problem of device damage, interfere with communications.

The technical scheme that the utility model adopted is; a kind of filtering capacitor monitoring and protecting device; comprise DSP; be connected with data acquisition module, relay, LCD, wireless module, button and GPS on the DSP, inverter is connected with DSP, GPS, data acquisition module, LCD, wireless module respectively.

Characteristics of the present utility model also are,

Data acquisition module wherein has the input of 14 road signals, the multiplexer of A/D converter using 16 bit resolutions wherein.

DSP wherein adopts TMS320C54X.

The beneficial effects of the utility model are,

(1) adopts combining of software and hardware, realize intelligent.Realize multiple relaying protection function by various algorithms, modularization, intellectuality etc. wait each fault made and react fast and accurately and move.

(2) utilize program that hardware is implemented monitoring, note abnormalities, in time make corresponding processing, to the unusual of software with disturb etc., make identification and get rid of (as house dog).Adopted Anti-Jamming Technique, in order to improve the reliability of device.Adopt the multi-layer sheet technology in the hardware designs, power supply, ground wire are arranged in the different brush board layers of answering, the same original paper of the module of the same function on the printed circuit board of answering is concentrated in together ground connection; Adopt photoelectricity isolation, relay to isolate; Hardware self-resetting circuit etc.Adopt in the software design various memories among the DSP are detected, the detection of switching value input, output circuit, the detection of data acquisition system, watchdog technique etc.

(3) not only can realize GPF (General Protection False, and can realize some additional functions that as the record of fault, the check and correction of unified time by communication network, is uploaded to expert software timely with data, carries out the arrangement and the processing of data.

(4) adopt wireless communication technology and computer to communicate.Be not subjected to the restriction of physical space, be not subjected to the interference of electromagnetic field of hyperbaric environment, well solved the wireless communication problems between monitoring and protecting device and the computer.

(5) adopt the gps clock signal to realize synchronous acquisition.Because monitoring and protection and computer are radio communications, so will realize synchronous acquisition a unified clock signal must be arranged.Native system adopts the unified clock of gps clock signal as each tester, can realize the transmission of synchronous acquisition and data in the permissible accuracy scope.

Description of drawings

Fig. 1 is the structural representation of the utility model filtering capacitor monitoring and protecting device;

Fig. 2 is the data acquisition block diagram of the utility model filtering capacitor monitoring and protecting device;

Fig. 3 is the differential pressure protection philosophy block diagram of the utility model filtering capacitor monitoring and protecting device;

Fig. 4 is the difference stream protection philosophy block diagram of the utility model filtering capacitor monitoring and protecting device;

Fig. 5 is the total current protection philosophy block diagram of the utility model filtering capacitor monitoring and protecting device;

Fig. 6 is the Microcomputer Protection software general flow chart of the utility model filtering capacitor monitoring and protecting device;

Fig. 7 is the monitoring program flow chart of the utility model filtering capacitor monitoring and protecting device;

Fig. 8 is the defencive function program flow diagram of the utility model filtering capacitor monitoring and protecting device;

Fig. 9 is the switch value input interface circuit of the utility model filtering capacitor monitoring and protecting device photoelectric coupled device;

Figure 10 is the switching value output and the control relay circuit of the utility model filtering capacitor monitoring and protecting device photoelectric coupled device.

Among the figure, 1.DSP, 2. data acquisition module, 3. relay, 4.LCD, 5. inverter, 6. wireless module, 7. button, 8.GPS.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

The structure of the utility model filtering capacitor monitoring and protecting device; as shown in Figure 1; comprise DSP1; be connected with data acquisition module 2, relay 3, LCD4, wireless module 6, button 7 and GPS8 on the DSP1; inverter 5 is connected with DSP1, GPS8, data acquisition module 2, LCD4, wireless module 6 respectively; adopt two-way communication between DSP1 and data acquisition module 2, relay 3, the wireless module 6,, can show and setup parameter by LCD4 and button 7.Give each system module power supply by inverter 5.

The course of work of the utility model filtering capacitor monitoring and protecting device is; DSP1 gives an order; control data acquisition module 2 is sampled in each unification constantly to the digital collection sequence of each passage, converts these sampled values to digital quantity again, and reads in internal memory; allocate and transport program then; carry out computing, the result of computing and the parameter of setting are compared, make corresponding response; by the LCD4 liquid crystal display, be uploaded to the computer of far-end by wireless module 6.

As shown in Figure 2, wherein data acquisition module 2 has the input of 14 road signals, (voltage transformer TV summation current transformer TA) is converted into secondary singal (alternating voltage by power sensor, alternating current, direct voltage, direct current), pass through analog quantity channel, for voltage, electric current, residual voltage and electric current and direct voltage and electric current etc. have kept conversion ratio unanimity (changing identical as the amplitude proportion between the three-phase electricity or between the three-phase current) between temporal simultaneity (being equivalent to keep between each passage original phase relation constant for AC signal) and the connatural passage.Be input as the signal flow of example with interchange: input conversion and voltage form loop, preposition simulation low-pass filter, sampling hold circuit, analog to digital conversion circuit.In this flow process, adopt electrical isolation and electromagnetic shielding,, reduce from the interference of high-tension apparatus to weak current part to ensure the safety of weak current part.As Fig. 3, Fig. 4 and shown in Figure 5, the function of relaying protection realizes all realizing by algorithm that the differential pressure protection can connect the three-phase differential pressure of capacitor, also can connect a phase differential pressure, when arbitrary phase differential pressure is protected predetermined value greater than differential pressure, and delayed startup.Difference stream defencive function, when the detected difference of device flows greater than difference stream protection definite value, delay start.The total current fast tripping protection when arbitrary phase current during greater than setting value, moves in outlet, but the fast shut-off short trouble.

As Fig. 6, Fig. 7, shown in Figure 8, basic procedure for software function, power on or hardware reset after, system initialization, initialization have to be established etc. the conversion of the definition of the setting of the distribution in each memory appropriate address space, input/output port, timer function, interrupt control unit, setting value and loading, each controlled flag first; Self check then; find the defective of protective device rapidly by self check; send alarm signal and latch-up protection outlet, self check wherein has program self check, definite value self check, input channel self check, output loop self check, wireless communication module self check, working power self check etc.If by self check; then enter monitoring program; carry out the data acquisition initialization and start timing sampling and interrupt; timer begins to produce the interrupt requests of once sampling every a sampling period circulation; after enough sampled datas; entering major cycle, is an Infinite Cyclic in the numerical protection normal course of operation, only judges to stagger the time in reset operation and self check and just can end.

In this software section; carry out the radio communication task in addition; for the data preparation is carried out in the transmission and the acceptance of information; data sending request according to defence program is accepted related data; communicate finish message and packing according to communication protocol; and be placed on data transmission buffering area, go out by antenna transmission.

As Fig. 9, shown in Figure 10, the switch value input interface circuit adopts photoelectricity to isolate, and guarantees the safety of inner light current element, reduces external disturbance.This in fact operating voltage is exactly having or not of a kind of signal, controls the light on and off of light-emitting diode, makes the triode conducting, the output high-low level, and this high-low level can directly be read by DSP as digital quantity.Switching value output circuit and control relay circuit, control signal from DSP, high-low level " 1 ", " 0 " drive relay work, and the R in the circuit, the series connection of C and V parallel connection are the damages that causes related elements for fear of the current break higher reverse voltage of generation.

Claims

1. filtering capacitor monitoring and protecting device; it is characterized in that; comprise DSP(1); DSP(1) be connected with data acquisition module (2), relay (3), LCD(4 on), wireless module (6), button (7) and GPS(8), inverter (5) respectively with DSP(1), GPS(8), data acquisition module (2), LCD(4), wireless module (6) is connected.

2. filtering capacitor monitoring and protecting device according to claim 1 is characterized in that, described data acquisition module (2) has the input of 14 road signals, the multiplexer of A/D converter using 16 bit resolutions wherein.

3. filtering capacitor monitoring and protecting device according to claim 1 is characterized in that, described DSP(1) employing TMS320C54X.