CN201667535U - Electric power system line protection observe and control apparatus - Google Patents

Abstract

A direction line protection observe and control apparatus which is used for a non-direct neutral grounding system under 35 K voltage grade and is composed of a sampling part, a CPU, an input/output part, an operation part, a man-machine conversation part and a power supply module, the sampling part isolates and transforms a secondary AC signal into a small current or small voltage signal, then is connected with the CPU by the A/D. The CPU as the main part can complete the acquisition and the processing of the analog value and the switching value. The human-machine interaction part can be connected with the CPU by a parallel port to implementing the functions of browsing the measured data, modifying the fixed value and channel coefficients and in situ operating. The power supply module can output three sets of voltages through the anti-jamming filtering loop by adopting the 220V AC/DC switch power supply to provide the power supply for the CPU, the A/D acquisition part and the input/output part. The hardware circuit design adopts the switching value output detection circuit to improve the stability of the apparatus. The apparatus of the utility model has characteristics of reliability, safety, economy and practicality.

Description

Circuit on power system protection measure and control device

Technical field

The utility model relates to the protecting electrical power system and the measure and control device of the following electric pressure of a kind of 35KV of being applicable to, is mainly used in direction route protection and observing and controlling in the non-direct ground system of electric power system.

Background technology

Along with Chinese economic development, power network is constantly complicated, and is also more and more higher to the requirement of the protection of electrical network, in case erroneous judgement appears in protective device, serious consequence will appear in malfunction.Exist strong electromagnetic around the operational environment of microcomputer protective relay device, these interference signal frequency height, amplitude are big, are easy to successfully enter the inside of microcomputer protective relay device by inductance coupling high; On the other hand, the duration of these interference signals is shorter.Because high speed operation under the clock control of portion within it of the microcomputer in the microcomputer protective relay device; can not escape interference signal with simple delay circuit; after interference signal enters microcomputer protective relay device inside; not only influential to the accuracy of each aanalogvoltage and current sampling data; but also will damage some components and parts in the device; if when having damaged the EPROM of the program that is equipped with or internal memory RAM that control program flows to pointer; microcomputer can't normally move; the generation program is overstepped the limit or is caused that problems such as dysfunction appear in device, directly influences the microcomputer protective relay device correct operation.In the measure and control device of electric power system computer line below 35KV protection at present; the routine techniquess that use aspect stable more; though these technology are simple in structure; but but there is defective on the function; along with the continuous development of microcomputer technology,, often to be equipped with special chip and reach such effect for stability and the anti-interference that improves device; tend to make volume to increase but do like this, use cost increases.In the last few years, the continuous application on Microcomputer Protection of the communication technology and Intelligent Control Theory, though stability is further promoted, the cost of paying is also in continuous increase.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned weak point, and what provide is a kind of stable, safety, and circuit is simple, a kind of cheaply protecting electrical power system and measure and control device that is applicable to the following electric pressure of 35KV.

The technical scheme that its technical problem that solves the utility model adopts is: i.e. the computer line protective device of a kind of electric power system; it is characterized in that it comprises: sampling plug-in, CPU card, open into leaving and operate plug-in unit, human-computer dialogue plug-in unit and power module, wherein:

Described sampling plug-in comprises that several are installed in voltage transformer summation current transformer and low pass filter on the transmission line, voltage transformer pt and current transformer CT become big electric current on the transmission line of gathering or big voltage signal into the secondary AC signal, through the low pass filter isolated variable is little electric current or small voltage signal, is input to CPU card through A/D converter;

Described CPU card comprises holder, A/D converter, cpu chip and watchdog circuit, it becomes digital signal by A/D converter with the analog signal conversion of importing, handle by cpu chip again, and by control signal output ends, be connected with the signal input end of opening into leaving and operate plug-in unit, also receive by opening simultaneously into leaving and operate the signal that the plug-in unit feedback is come by the feedback signal input;

Described opening into leaving and operate plug-in unit comprises the switching value output detection circuit, leaves driving, opens into optocoupler, and finishes the execution relay of tripping operation, closing operation; Accept the operational order that the CPU card control signal output ends is sent here through the switching value output detection circuit, finish combined floodgate, tripping operation through leaving the drive controlling relay; Simultaneously, open into the input of optocoupler and close a position/jumping signal directly or by the sensor acquisition relay, and the pressure signal of redlay spring, these signals are through opening into optocoupler, after the interference-shielded, send into and be sent to human-computer dialogue plug-in unit closing the position, jump the position situation and pressure anomaly, alarm and pressure reduce locking breaker tripping and closing function after CPU card is handled by the liquid crystal display relay.

Described human-computer dialogue plug-in unit is made up of liquid crystal and keyboard, is connected with CPU card by drive circuit;

Described power module is exported 3 groups of voltages, and wherein+5V is used for cpu chip, ± 12V is used for A/D converter, and 24V is used to open into amount and drives the positive supply of relay.

The utility model route protection supervising device is to be used for the non-direct ground system of the following electric pressure of 35KV or the control of traverse line drive test and the protective device of low resistance grounding system, and system adopts standard-sized sheet to put, the modular construction design; can realize protection, measure, control; telemechanical, signal, communication; accident record, fault filtering and 5 functions such as anti-have adopted current advanced technology and device; satisfy reliably safety, economy; practicality, advanced technology and be convenient to basic principle such as expansion.And solved microcomputer device not as the reliable problem of conventional apparatus, can operation reliably and with long-term under adverse circumstances.

The beneficial effects of the utility model are:

1. system adopts modularized design, that is to say the protection for complete Microcomputer Protection, various circuit and electric main equipment, all press the modularized circuit composition of above-mentioned five parts.Different use occasions constitutes by different modular combination modes.Complete microcomputer protecting device like this can bring great convenience for design, operation and maintenance, debugging.

2. the deadlock phenomenon by adopting two house dogs effectively to avoid single house dog to occur adopts high performance single-chip microcomputer and extensive programmable logic chip obviously to improve circuit stability with adopting compensation technique.

3. by adopting the switching value output detection circuit, improve the faulty action preventing ability of outlet loop, guaranteed that malfunction does not take place device when component wear, and can send alarm signal, guarantee to take measures in time to repair.

Description of drawings

Fig. 1 is a composition structure principle chart of the present utility model;

Fig. 2 is a switching value output detection circuit schematic diagram.

Among the figure: 1. sampling plug-in, 2.CPU plug-in unit, 3. open into leaving and operate plug-in unit, 4. human-computer dialogue plug-in unit, 5. power insert.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in detail:

As shown in Figure 1, the utility model mainly by

The computer line protective device of electric power system is characterized in that it comprises: sampling plug-in 1,CPU card 2, open into leaving and operate plug-inunit 3, human-computer dialogue plug-in unit 4 andpower module 5, wherein:

Described sampling plug-in 1 comprises that several are installed in voltage transformer summation current transformer and low pass filter on the transmission line, voltage transformer pt and current transformer CT become big electric current on the transmission line of gathering or big voltage signal into the secondary AC signal, through the low pass filter isolated variable is little electric current or small voltage signal, is input toCPU card 2 through A/D converter;

DescribedCPU card 2 comprises holder, A/D converter, communication interface, cpu chip and watchdog circuit, it becomes digital signal by A/D converter with the analog signal conversion of importing, handle by cpu chip again, and finish the computing and the judgement of various protection criterions, pass through control signal output ends then, be connected with the signal input end of opening into leaving and operate plug-in unit, also receive by opening simultaneously, comprise that relay closes the bit per minute position into leaving and operate the signal that the plug-in unit feedback is come by the feedback signal input, the pressure signal of spring, and carry out judgment processing; Described communication interface comprises independent CAN, RS485, and the RS232 interface can couple together by these communication interfaces and printer or communication manager, constitutes Automation of Electric Systems.

CPU card 2 is cores of whole device, finish the processing of analog quantity, switching value, the computing of various protection criterions, judgement, adopt high performance Mitsubishi dsp chip to constitute simple and high-efficient data acquisition and processing (DAP) system, unique design and advanced surface mounting technology and multilayer board technology have improved the reliability and the antijamming capability of system greatly; The cyberdog circuit adopts two watchdog reset circuits, and the assurance system can in time reset when unusual; Perfect software and hardware self check can also make when system is assorted to be moved and guarantee that various parameters are intact; Preserve definite value, coefficient and configuration with serial EEPROM, guarantee that these parameters are not revised by mistake and can power down keep with multiple write-protect function; Analog to digital converter adopts high-speed a/d.

Described opening into leaving and operate plug-inunit 3 comprises the switching value output detection circuit, leaves driving, opens into optocoupler, and finishes the execution relay of tripping operation, closing operation; Accept the operational order thatCPU card 2 control signal output ends are sent here through the switching value output detection circuit, finish combined floodgate, tripping operation through leaving the drive controlling relay, it is wherein, described that to leave the model that driving can adopt Mitsubishi to sell be the PA1A-12V drive circuit; Simultaneously, open into the input of optocoupler and close a position/jumping signal directly or by the sensor acquisition relay, and the pressure signal of redlay spring, these signals are through opening into optocoupler, after the interference-shielded, send into and be sent to human-computer dialogue plug-in unit closing the position, jump the position situation and pressure anomaly, alarm and pressure reduce locking breaker tripping and closing function after CPU card is handled by the liquid crystal display relay.

Described human-computer dialogue plug-in unit is made up of liquid crystal and keyboard, is connected with CPU card by drive circuit; Its receive CPU card measurement data, switching value data, and various fault warning information on LCD screen, show for the user and browse, it has designed keyboard operation easily and Chinesizing liquid crystal display, for the user provides friendly use interface.Can browse measurement data easily, revise definite value and passage coefficient, carry out local operation by this interface.System provides detailed fault warning information and the function of recollecting SOE, helps the user to handle problems timely and accurately.

It is the Switching Power Supply of the 220V interchange commentaries on classics direct current of XRA05/110S24 that describedpower module 5 adopts star source Feng Tai company model, it exports 3 groups of voltages behind the anti-interference filtration loop, wherein+and 5V is used for cpu chip, and ± 12V is used for A/D converter, and 24V is used to open into amount and drives the positive supply of relay.

Switching value output detection circuit as shown in Figure 2 comprises two optical coupler T1 and T2, and wherein the light current end of optical coupler T1 is connected withCPU card 2 control signal output ends by the parallel port, and its output termination is left driving; The input of optical coupler T2 is connected with the collector electrode of a triode, and the base stage by this triode connects the output that is connected on optical coupler T1 behind resistance and the diode again; The output of optical coupler T2 is connected withCPU card 2 detection signal inputs by the parallel port;CPU card 2 is at first sent a signal by control signal output ends, receives by the detection signal input again, if CPU detects optical coupler (T1) conducting, illustrate that output channel is normal, if detection less than, just send alarm signal.

Because above-mentioned testing process is extremely short,, can not make the actuating of relay so when the execution relay ofparallel interface 1 output switching value passage does not also move, drive digital code and be retracted.If in official hour, microprocessor can not receive the signal of T2 conducting, then shows the component wear of this switching value output channel, and microprocessor CPU is also recalled the driving digital code that is sent toparallel interface 1 simultaneously.In microcomputer protective relay; more than one of switching value output channel; in order to give full play to the effect of self check hardware circuit; public one of this self check hardware circuit carries out self check for a plurality of switching value output channels, promptly the coupling element of each switching value output channel is introduced on the public self-checking circuit by isolating diode.

Claims (3)

1. circuit on power system protection measure and control device is characterized in that it comprises: sampling plug-in (1), CPU card (2), open into leaving and operate plug-in unit (3), human-computer dialogue plug-in unit (4) and power module (5), wherein:

Described sampling plug-in (1) comprises that several are installed in voltage transformer summation current transformer and low pass filter on the transmission line, voltage transformer pt and current transformer CT become big electric current on the transmission line of gathering or big voltage signal into the secondary AC signal, through the low pass filter isolated variable is little electric current or small voltage signal, is input to CPU card (2) through A/D converter;

Described CPU card (2) comprises holder, A/D converter, communication interface, cpu chip and watchdog circuit, it becomes digital signal by A/D converter with the analog signal conversion of importing, and is handled by cpu chip, and passes through control signal output ends, be connected with the signal input end of opening into leaving and operate plug-in unit, also receive by opening simultaneously into leaving and operate the signal that the plug-in unit feedback is come by the feedback signal input;

Described opening into leaving and operate plug-in unit (3) comprises the switching value output detection circuit, leaves driving, opens into optocoupler, and finishes the execution relay of tripping operation, closing operation; Accept the operational order that CPU card (2) control signal output ends is sent here through the switching value output detection circuit, finish combined floodgate, tripping operation through leaving the drive controlling relay; Simultaneously, open into the input of optocoupler and close a position/jumping signal directly or by the sensor acquisition relay, and the pressure signal of redlay spring, these signals are through opening into optocoupler, after the interference-shielded, send into and be sent to human-computer dialogue plug-in unit closing the position, jump the position situation and pressure anomaly, alarm and pressure reduce locking breaker tripping and closing function after CPU card is handled by the liquid crystal display relay.

Described human-computer dialogue plug-in unit (4) comprises LCD LED and keyboard, is connected with CPU card by drive circuit;

3 groups of voltages of described power module (5) output, wherein+5V is used for cpu chip, ± 12V is used for A/D converter, and 24V is used to open into amount and drives the positive supply of relay.

2. circuit on power system protection measure and control device according to claim 1, it is characterized in that: the described switching value output detection circuit of leaving and operating in the plug-in unit comprises two optical couplers, wherein the light current end of an optical coupler (T1) is connected with CPU card (2) control signal output ends by the parallel port, and its output termination is left driving; The input of optical coupler T2 is connected with the collector electrode of a triode, and the base stage by this triode connects the output that is connected on optical coupler T1 behind resistance and the diode again; The output of optical coupler (T2) is connected with CPU card (2) detection signal input by the parallel port; CPU card (2) is at first sent a signal by control signal output ends, receives by the detection signal input again, if CPU detects optical coupler (T1) conducting, illustrate that output channel is normal, if detection less than, just send alarm signal.

3. circuit on power system protection measure and control device according to claim 1, it is characterized in that: the watchdog circuit in the described CUP plug-in unit (2) adopts two watchdog reset circuits.

Images