CN103778831A - Standard current transformer simulator - Google Patents
Standard current transformer simulator Download PDFInfo
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- CN103778831A CN103778831A CN201410009677.1A CN201410009677A CN103778831A CN 103778831 A CN103778831 A CN 103778831A CN 201410009677 A CN201410009677 A CN 201410009677A CN 103778831 A CN103778831 A CN 103778831A
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Abstract
The invention provides a standard current transformer simulator which includes an upper computer, a control machine, a shell, a current transformer disposed in the shell, and a plurality of simulation wiring terminals disposed outside the shell, wherein the upper computer and the control machine are connected in a communication mode, and the control machine is connected with the simulation wiring terminals. According to the standard current transformer simulator, real-time simulation is carried out by the use of a computer to simulate the on-site working condition to the greatest extent, and under the condition that the appearance and functions of equipment are completely simulative, the input and output voltages are small, and reliable security guarantee can be provided for students in standard current transformer training examination under safe working voltage.
Description
Technical field
The present invention relates to electric energy mutual-inductor field, relate in particular to a kind of standard current transformer simulator.
Background technology
Current domestic electric energy metering verification mobility of people is large, the renewal of knowledge is slow, professional knowledge and working level uneven, inter-disciplinary talent is on the low side, the technician who grasps mutual inductor field detecting technology is less, affect normal testing, mainly because training set lags behind, be with first-class training method mainly with concentration theory training, lecture experiment, written exam and with on-the-spot one at present, all have significant limitation, training efficiency is very low.
And training in actual environment, because electric energy measuring equipment has high voltage, large electric current, can produce potential safety hazard to the person and equipment, limit quality and the efficiency of training.
Can under the condition of low pressure, little electric current, operate if can provide a kind of, and function and complete standard current transformer that is virtually reality like reality in appearance, so, the safe operation during to this equipment of electric energy metering verification staff training will be very favourable.
Summary of the invention
For addressing the above problem, the invention provides a kind of standard current transformer simulator, comprise host computer, controller, housing, be positioned at housing current transformer, be positioned at some simulation connection terminals of housing outside; Described host computer and controller communication connection, controller is connected with described some simulation connection terminals; Wherein
Simulation connection terminal is for analog current mutual inductor primary line input terminal, secondary line input terminal;
Controller is used for each simulation connection terminal connections situation to carry out signals collecting, and is uploaded to host computer;
Host computer is for uploading signal, and whether line is correctly judged, shows in real time each simulation connection terminal line situation controller sending controling instruction information, the parameter of setting described simulator, reception controller.
Further, described simulation connection terminal part comprises three primary line input terminals, three secondary line input terminals.
Further, the simulation no-load voltage ratio value that described simulator is realized is 100/5A, 1000/5A.
Further, described current transformer is straight-through current transformer.
Further, the parameter of described standard current transformer simulator comprises simulation no-load voltage ratio value, polarity, rated power factor, rated load, rated frequency, accuracy grade.
Further, the standard current transformer simulation page setup of host computer has wiring situation viewing area, the data that monitoring controller sends are monitored with entrusting in region, described wiring situation viewing area, with the Split(of string) method decomposition data, and with according to the break-make Relationship Comparison of standard, show in real time the every single line connecing.
Further, controller comprises a terminals driver output module, tail terminals Gather and input module, polarity and signal discrimination module, RS232 transceiver module, MCU module and power supply unit module; MCU module is connected with signal discrimination module is unidirectional with a terminals driver output module, tail terminals Gather and input module, polarity, is connected with RS232 transceiver module is two-way.Wherein,
Terminals driver output module, for receiving the drive control signal that MCU module is sent, applies low level to wiring the end of a thread to be judged;
The tail terminals Gather and input module line tail end signal scanning that is used for achieving a butt joint, inquiry judge the wiring level state of other wiring tail ends unexpectedly except band one by one;
Polarity and signal discrimination module are used for realizing the amplification of signal, and realize the analog to digital conversion of signal;
RS232 transceiver module for the signal of tail terminals Gather and input module is transferred to host computer or by the steering order communication of host computer to controller;
MCU module is used for control head terminals driver output module drive terminal stud to be judged, and constantly scans the logic level signal of tail terminals Gather and input module, judges the break-make relation of wiring between each simulation connection terminal;
Power supply unit module is used for to other each module for power supply.
Further, described terminals driver output module adopts 74HC374 or 8 latch integrated circuit; Described terminals driver output module adopts 74HC374 or 8 latch integrated circuit; Described polarity and signal discrimination module are made up of trsanscondutance amplifier and zero cross detection circuit; Described RS232 transceiver module SP3232 transceiver; Described MCU module adopts the MPC82G 516A singlechip chip of PQFP44 encapsulation.
Further, described host computer is connected by serial ports with controller.
Beneficial effect of the present invention is:
The present invention adopts Computer real time simulation, simulated field working environment to greatest extent, under the condition of equipment appearance, function complete simulation, input and output voltage is little, can realize under trouble free service voltage and to provide the training of the standard current transformer reliable safety guarantee of taking an examination for student.
Controller of the present invention meets the technical requirement of standard current transformer calibrating wiring simulation system or other similar simulation training systems completely, can realize all electronic, judge in real time, exactly the on off operating mode of simulation connection, and in time, constantly result data is uploaded to host computer and does wiring misinterpretation etc. is further processed.
Host computer can be by wiring point test connection judgements (actual tests wiring situation can be shown on computers) such as the simulation connection terminal L1 of housing, L2, L3, K1, K2, K3, excite to greatest extent comprehension and the actual operational capacity of student to work on the spot, improve rapidly student's operative skill, there is stronger production practical significance.
accompanying drawing explanation:
Fig. 1 is principle of the invention block diagram.
Fig. 2 is controller principle module map.
Fig. 3 is the software principle block diagram of controller.
embodiment:
The present invention includes as host computer (being generally computing machine), controller, housing, be positioned at the current transformer of housing, be positioned at the some simulation connection terminals outside housing.
As shown in Figure 1: host computer is connected by RS232 serial ports with controller, each simulation connection terminal is connected with the connector socket of controller mainboard, described housing current transformer casing that is virtually reality like reality, and housing the inside is provided with current transformer.
Describe in detail respectively below.
1. current transformer
The described current transformer that is positioned at housing is made up of winding, Secondary Winding, iron core and a framework, the connection terminal etc. of mutually insulated.Its principle of work is substantially identical with transformer, and the number of turn (N1) of a winding is less, is directly series in power circuit a load current (I
1) when the winding, the alternating flux induction of generation produces the secondary current (I reducing in proportion
2); The number of turn (the N of Secondary Winding
2) more, connect and form closed-loop path with the secondary load (Z) of the current coil such as instrument, relay, transmitter, winding has with Secondary Winding the ampere-turn equating due to one time, I
1n
1=I
2n
2, in current transformer rated transformation ratio current transformer actual motion, load impedance is very little, and Secondary Winding, close to short-circuit condition, is equivalent to the transformer of a short circuit operation.
Described mutual inductor can use straight-through current transformer, and itself structure is not established winding one time, and current-carrying (load current) wire is by L
1to L
2play a winding effect through rolled circle (or other shapes) iron core rolling into by siliconized plate.Be wrapped on circular iron core Secondary Winding Direct Uniform, connect and form closed-loop path with the secondary load of the current coil such as instrument, relay, transmitter, because straight-through current transformer is not established winding one time, its no-load voltage ratio is determined through the number of turn in mutual inductor iron core according to a winding, the punching number of turn is more, and no-load voltage ratio is less; Otherwise the punching number of turn is fewer, no-load voltage ratio is larger.
By this Current Transformer Secondary current/voltage of sampling, thereby calculate polarity positive and negative of its primary line passing.
The primary line input terminal of current transformer is L1, L2, and secondary line input terminal is K1, K2.Extraneous power supply accesses to secondary line input terminal K1, the K2 of current transformer after isolating transformer.
The secondary line terminal part of current transformer is connected to power supply by isolating transformer
2. simulation connection terminal
Simulation connection terminal is arranged on housing appearance.As shown in fig. 1: simulator primary line input terminal is masked as L1, L2, L3; Secondary line input terminal is masked as K1, K2, K3, and described six input terminals are directly connected with the mainboard of controller.As required, controller can be identified the state that interconnects of L1, L2, L3, K1, this six roots of sensation wiring of K2, K3.The head end of 6 wiring is respectively: 1a, and 2a ... .5a, 6a.The tail end of 6 wiring is respectively: 1b, 2b ... 5b, 6b.Namely, host computer by controller to identify timely and accurately each end number and other 5 ends number relation (conducting or disconnection).Know method for distinguishing and adopt scan-type.
It should be noted that, it is 100/5A, 1000/5A that the present invention can realize simulation no-load voltage ratio value, simulation highest ranking 0.02S level, overload capacity 120%.
3. controller
Controller, under the management of embedded software, can be realized all electronic, the fast wiring situation of criterion current transformer simulation connection terminal, and can expand to the more interconnected relationship of multiple conducting wires, and constantly, in real time result is uploaded to host computer.
A. the hardware of controller is realized
Figure 2 shows that controller theory diagram.Controller is made up of a terminals driver output module, tail terminals Gather and input module, polarity and signal discrimination module, RS232 transceiver module, MCU module and power supply unit module, MCU module is connected with signal discrimination module is unidirectional with a terminals driver output module, tail terminals Gather and input module, polarity, is connected with RS232 transceiver module is two-way.Below each module is introduced:
Terminals driver output module: adopt 74HC374 or 8 latch integrated circuit.Receive the drive control signal that MCU module is sent, apply low level to wiring the end of a thread to be judged.
Tail terminals Gather and input module: adopt 75HC244 or 83 state door integrated circuit.The line tail end signal scanning that achieves a butt joint, inquiry judge the wiring level state of other wiring tail ends unexpectedly except band one by one.
Polarity and signal discrimination module: formed by trsanscondutance amplifier and zero cross detection circuit.The effect of trsanscondutance amplifier is that signal is fully amplified, and with the sensitivity that guarantees to detect, the effect of zero cross detection circuit is that sinusoidal wave simulating signal is become to digital signal, is convenient to MCU and processes.MCU obtains after these signals, according to certain algorithm, can judge polarity just with instead.
RS232 transceiver module: adopt SP3232 transceiver or similar integration module, the communication interface by RS232 standard by the continuous real-time Transmission of data gathering to host computer or by the steering order communication of host computer to controller.
MCU module: the MPC82G 516A singlechip chip that adopts PQFP44 encapsulation.The scanning sequence that MCU module is loaded according to single-chip microcomputer is by the logic level signal of continuous scanning collection terminals tail Gather and input module, judge the break-make relation of each lead wiring terminal, MCU module is also responsible for controlling terminal stud driver output module and is specifically driven which root terminal stud simultaneously.MPC82G516 A is the single-chip microprocessor of the efficient 1-T structure based on 80C51, and every instruction needs 1 ~ 7 clock signal (than fast 6 ~ 7 times of standard 8051), with 8051 instruction set compatibilities.Therefore in the case of having same processing power with standard 8051, MPC82G516A only needs low-down travelling speed, can reduce significantly thus power consumption simultaneously.
Power supply unit module: provide other each modules required working power.
B. the software of controller is realized
Fig. 3 is the software principle block diagram of this controller.Mainly be divided into 3 steps: program timing scanning and initialization, wiring state Real-time Collection, data are uploaded in real time.
Described program timing Scan Architecture and initialization step are mainly realized the timing cycle scanning of program, be convenient to realize multiple task management and synchronize accurately, have guaranteed like this reliability of data acquisition, communication.
Wiring state Real-time Collection step mainly realizes the whole Real-time Collection process that scan-type drives terminal stud, gathers all conducting of terminals tail.
It is by application layer communications protocol that real time data is uploaded step, and the wiring situation that wiring state Real-time Collection functional module is collected is converted to the data of upper function identification, and sends to host computer.
C. controller wiring determination methods
Concrete grammar and the step of controller wiring judgement are as follows:
Step 1: after program scanning structure initialization, MCU module is sent drive control signal, produce the end of a thread end of a certain wire of logic low driving by a terminals driver module, present with low level to the end of a thread end of identification, and other the end of a thread ends are all presented with high level;
Step 2:MCU module adopts the mode of program scanning, scan period is less than 100ms, by tail terminals Gather and input module, inquire about one by one the level state of other wire tail ends, if the level measuring in terminal tails corresponding to tail terminals Gather and input module is low level, illustrate that this point is communicated with the end of a thread, if the level measuring is high level, illustrate that this point and the end of a thread disconnect, MCU module all gathers tail terminals Gather and input module terminals tail level state one time, judges like this break-make connection relationship that is driven wire and other wires;
Step 3: by this process circulation, the wiring head end that drives fast all the other analog conducting wires of terminals driver module scan-type, after the head end of whole lines is completed by driving one by one, MCU module just can collect the break-make situation of all conducting in real time, obtains the annexation between all conducting;
Step 4:MCU module is uploaded to host computer by RS232 transceiver module by the result of wire break-make annexation according to communication protocol after completing the collection of break-make situation of all conducting, the actual connection relationship comparison that host computer is sent here according to the break-make relation of standard and RS232 transceiver module again, carries out wiring relation to wrong judgement.So far, whole wiring deterministic process result.Send whole cycle of completing of data from collecting, be not more than 100ms, Real-time Collection the mutual annexation of all conducting.
4. host computer
Described host computer can be used in the parameter of established standards current transformer simulator, as no-load voltage ratio (being rated primary current/rated secondary current), rated power factor, rated load (containing lower limited load), rated frequency, accuracy grade, and there is region, viewing area display standard circuit diagram mutual inductor interstar connection figure.6 connection terminals of display simulation wiring part in wiring diagram, when operating personnel carry out after line terminal, even if meeting shows on viewing area.
The job step of host computer is:
1. host computer loads the standard current transformer simulation page, and operating personnel set no-load voltage ratio, the parameters such as rated power factor, nominal load, rated frequency, accuracy grade.
2. the data that monitoring controller sends are monitored with entrusting in region, viewing area, and with the Split(of string) method decomposition data, can intelligentized every single line that real-time demonstration student connects in time by the mode of analyzing data line,
3. the actual connection relationship comparison that host computer is sent here according to the break-make relation of standard and RS232 transceiver module, carries out wiring relation to wrong judgement.What wiring was correct represents with black line, and the red line of use of wiring error represents.
Beneficial effect of the present invention is:
The present invention adopts Computer real time simulation, simulated field working environment to greatest extent, under the condition of equipment appearance, function complete simulation, simulation connection, makes wiring voltage become very low (generally only have about 10V), can realize under trouble free service voltage and to provide the training of the standard current transformer reliable safety guarantee of taking an examination for student.
Controller of the present invention meets the technical requirement of standard current transformer calibrating wiring simulation system or other similar simulation training systems completely, can simulate mutual inductor punching function, can realize all electronic, judge in real time, exactly the on off operating mode of simulation connection, and in time, constantly result data is uploaded to host computer and does wiring misinterpretation etc. is further processed.
Host computer can be by wiring point test connection judgements (actual tests wiring situation can be shown on computers) such as the simulation connection part connection terminal L1 of housing, L2, L3, K1, K2, K3, excite to greatest extent comprehension and the actual operational capacity of student to work on the spot, improve rapidly student's operative skill, there is stronger production practical significance.
Simulator has communication import, can with the sub-computer interconnection of simulation calibrating device, can be by computer installation no-load voltage ratio and polarity.
Reality simulation standard current transformer outward appearance, standard current transformer simulator outward appearance and true standard current transformer outward appearance are in full accord, and wherein the binding post on standard current transformer simulator panel is also the same with true standard current transformer.Reach the effect consistent with on-the-spot test environment.
Claims (9)
1. standard current transformer simulator, is characterized in that, comprise host computer, controller, housing, be positioned at housing current transformer, be positioned at some simulation connection terminals of housing outside; Described host computer and controller communication connection, controller is connected with described some simulation connection terminals; Wherein
Simulation connection terminal is for analog current mutual inductor primary line input terminal, secondary line input terminal;
Controller is used for each simulation connection terminal connections situation to carry out signals collecting, and is uploaded to host computer;
Host computer is for uploading signal, and whether line is correctly judged, shows in real time each simulation connection terminal line situation controller sending controling instruction information, the parameter of setting described simulator, reception controller.
2. standard current transformer simulator as claimed in claim 1, is characterized in that, described simulation connection terminal comprises three primary line input terminals, three secondary line input terminals.
3. standard current transformer simulator as claimed in claim 2, is characterized in that, the simulation no-load voltage ratio value that described simulator is realized is 100/5A, 1000/5A.
4. standard current transformer simulator as claimed in claim 1, is characterized in that, described current transformer is straight-through current transformer.
5. standard current transformer simulator as claimed in claim 1, is characterized in that, the parameter of described standard current transformer simulator comprises simulation no-load voltage ratio value, polarity, rated power factor, rated load, rated frequency, accuracy grade.
6. standard current transformer simulator as claimed in claim 5, it is characterized in that, the standard current transformer simulation page setup of host computer has wiring situation viewing area, the data that monitoring controller sends are monitored with entrusting in region, described wiring situation viewing area, with the Split(of string) method decomposition data, and with according to the break-make Relationship Comparison of standard, show in real time the every single line connecing.
7. the standard current transformer simulator as described in any one in claim 1～6, it is characterized in that, described controller comprises a terminals driver output module, tail terminals Gather and input module, polarity and signal discrimination module, RS232 transceiver module, MCU module and power supply unit module; MCU module is connected with signal discrimination module is unidirectional with a terminals driver output module, tail terminals Gather and input module, polarity, is connected with RS232 transceiver module is two-way.Wherein,
Terminals driver output module, for receiving the drive control signal that MCU module is sent, applies low level to wiring the end of a thread to be judged;
The tail terminals Gather and input module line tail end signal scanning that is used for achieving a butt joint, inquiry judge the wiring level state of other wiring tail ends unexpectedly except band one by one;
Polarity and signal discrimination module are used for realizing the amplification of signal, and realize the analog to digital conversion of signal;
RS232 transceiver module for the signal of tail terminals Gather and input module is transferred to host computer or by the steering order communication of host computer to controller;
MCU module is used for control head terminals driver output module drive terminal stud to be judged, and constantly scans the logic level signal of tail terminals Gather and input module, judges the break-make relation of wiring between each simulation connection terminal;
Power supply unit module is used for to other each module for power supply.
8. standard current transformer simulator as claimed in claim 6, is characterized in that, described terminals driver output module adopts 74HC374 or 8 latch integrated circuit; Described terminals driver output module adopts 74HC374 or 8 latch integrated circuit; Described polarity and signal discrimination module are made up of trsanscondutance amplifier and zero cross detection circuit; Described RS232 transceiver module SP3232 transceiver; Described MCU module adopts the MPC82G 516A singlechip chip of PQFP44 encapsulation.
9. standard current transformer simulator as claimed in claim 6, is characterized in that, described host computer is connected by serial ports with controller.
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|---|---|---|---|
| CN201410009677.1A CN103778831A (en) | 2014-01-09 | 2014-01-09 | Standard current transformer simulator |
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|---|---|---|---|
| CN201410009677.1A CN103778831A (en) | 2014-01-09 | 2014-01-09 | Standard current transformer simulator |
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Cited By (1)
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| CN108389453A (en) * | 2017-08-16 | 2018-08-10 | 苏州华电电气股份有限公司 | A kind of high-potting analogue system display platform |
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Application publication date: 20140507 |