CN103677033A - High-current automatic-stabilization control method and system for switching device test - Google Patents
High-current automatic-stabilization control method and system for switching device test Download PDFInfo
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- CN103677033A CN103677033A CN201310679851.9A CN201310679851A CN103677033A CN 103677033 A CN103677033 A CN 103677033A CN 201310679851 A CN201310679851 A CN 201310679851A CN 103677033 A CN103677033 A CN 103677033A
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Abstract
The invention provides a high-current automatic-stabilization control method and system for a switching device test. The high-current automatic-stabilization control system is a closed-loop automatic adjustment control system which is composed of a contact type voltage regulator, a high-current transformer, a transmitter and a high-interference-resistance electronic circuit. By the adoption of the high-current automatic-stabilization control system, a set test current is automatically tracked, and therefore automatic stabilization of the high current in a temperature-rise test is achieved. The main performance index of the high-current automatic-stabilization control system meets the stipulation of a related national standard and meets the requirement of the temperature-rise test. The high-current automatic-stabilization control system for the temperature-rise test achieves automatic stabilization of the test current and is convenient to use, easy to operate, and capable of achieving complete functions, relieving the labor intensity of test personnel, improving work efficiency, and effectively restraining the negative influence caused by human factors on a test result.
Description
Technical field
The present invention relates to a kind of automatic steady current control field, be specifically related to a kind of switchgear large electric current automatic steady current control method and system thereof for test.
Background technology
Along with China's electric power and the manufacturing develop rapidly of switchgear, switchgear application is in recent years more and more, because on-the-spot switchgear excess Temperature partly causes Frequent Accidents.This just forces switchgear manufacturer or research institution at laboratory simulation site environment, by switching devices, is passed to the temperature characterisitic of stable electric current research switchgear and is changed whether meet relevant national standard.In laboratory switching devices heavy current warming development test process due to the fluctuation of electrical network or near the variation of load switching in environment, cause the test current of test product not stablize.Original current stabilization has adopted mimic channel to control the method that saturable reactor regulates electric current, main dependence regulates and controls, measures test parameters manually, cause control accuracy low, debugging work load is large, the phenomenons such as data sheet does not conform to the actual conditions, staff is very large to the negative interference of test findings, and reliability is not high, and increased labour intensity, reduced work efficiency.
Summary of the invention
The present invention is directed to problems of the prior art, a kind of switchgear large electric current automatic steady current control method and system thereof for test are provided.
Switchgear of the present invention large electric current automatic steady current control method for test, comprises the following steps:
If A1≤X≤A1(1+ △ is X1) be false, PLC sends control signal to coarse adjustment pressure regulator, through the coarse adjustment of coarse adjustment pressure regulator, arrives A1≤X≤A1(1+ △ X1) set up; If A1≤X≤A1(1+ △ is X2) be false, through fine setting pressure regulator, be fine-tuning to A1≤X≤A1(1+ △ X2) set up;
Wherein, △ X1 is the large percentage error of rated current parameter A 1, and △ X2 is the little percentage error of rated current parameter A 1.
Described step
large percentage error △ X1≤5% of middle rated current parameter A 1; Little percentage error △ X2≤2% of rated current parameter A 1.
Described step
the method of work of middle PLC is that, during coarse adjustment, when X<A1, PLC drives the motor forward of coarse adjustment pressure regulator, as X> A1(1+ △ X1) time, PLC drives the motor reversal of coarse adjustment pressure regulator.
Described step
the method of work of middle PLC is that, during fine setting, when X<A1, PLC drives the motor forward of fine setting pressure regulator, as X> A1(1+ △ X2) time, PLC drives the motor reversal of fine setting pressure regulator.
Realize the system of large electric current automatic steady current control method for above-mentioned switchgear test, it comprises power supply, transformer, current transformer, transmitter, A/D converter and the PLC connecting successively, wherein between PLC and power supply, is respectively equipped with coarse adjustment pressure regulator and fine setting pressure regulator.
For handled easily, control, described PLC is also connected with man-machine interface.
In order to make the current balance type between every phase using every as a little closed loop, described transmitter Wei San road current transducer.
The method consists of respectively the automatic regulating system of closed loop contact type voltage regulator, strong current transformer, transmitter and high anti-interference electronic circuit, the test current setting is carried out from motion tracking, thereby realized the autostable of the large electric current of temperature rise test.
The present invention is relative, and prior art has the following advantages:
1, the present invention realizes the autostable of electric current on the basis of simulated field electric current, by the mode of testing, is provided and is stablized required electric current, adopts instrument and meter to measure the temperature rise of test product, and whether check product meets standard criterion, has improved the stability of electric current.
2, the present invention can effectively limit the negative interference of people to test findings, for research and development of products and the delivery test of switchgear provides important platform, has avoided operating in on-the-spot switchgear because excess Temperature causes Frequent Accidents.
3, the present invention, because PID regulator is realized by Programmable Logic Controller software, makes the wiring of whole system simple, is easy to install, and maintenance reduces, and has alleviated the labour intensity of testing crew, has improved work efficiency; Large current stabilization observing and controlling man-machine interface is friendly, and operation is directly perceived simple, multiple functional.
4, the present invention, without synchronizing signal, without phase sequence requirement, becomes system and is easy to debugging.
5, the control characteristic of the saturable reactor in power supply of the present invention is nonlinear, and Programmable Logic Controller can be identified its working range automatically, thereby automatically changes and control parameter, has improved the precision of steady current of output current.
6, the present invention is simple to operate, can be easily and computing machine or miscellaneous equipment communication.
7, the present invention can realize on the basis of automatic steady current, also has traditional manual voltage regulation mode.
Accompanying drawing explanation
Fig. 1 is control method process flow diagram of the present invention;
Fig. 2 is control system schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, switchgear test of the present invention is described in further detail by large electric current automatic steady current control method and system thereof.
The large electric current automatic steady current control method for test of switchgear as shown in Figure 1, comprises the following steps:
If A1≤X≤A1(1+ △ is X1) be false, PLC sends control signal to coarse adjustment pressure regulator, through the coarse adjustment of coarse adjustment pressure regulator, arrives A1≤X≤A1(1+ △ X1) set up; If A1≤X≤A1(1+ △ is X2) be false, through fine setting pressure regulator, be fine-tuning to A1≤X≤A1(1+ △ X2) set up;
Wherein, △ X1 is the large percentage error of rated current parameter A 1, and △ X2 is the little percentage error of rated current parameter A 1.
Described step
large percentage error △ X1≤5% of middle rated current parameter A 1; Little percentage error △ X2≤2% of rated current parameter A 1.
Described step
the method of work of middle PLC is that, during coarse adjustment, when X<A1, PLC drives the motor forward of coarse adjustment pressure regulator, as X> A1(1+ △ X1) time, PLC drives the motor reversal of coarse adjustment pressure regulator.
Described step
the method of work of middle PLC is that, during fine setting, when X<A1, PLC drives the motor forward of fine setting pressure regulator, as X> A1(1+ △ X2) time, PLC drives the motor reversal of fine setting pressure regulator.
The system of large electric current automatic steady current control method for switchgear test that realizes as shown in Figure 2, it comprises power supply 5, transformer 8, current transformer 9, transmitter 4, A/D converter 3 and the PLC2 connecting successively, wherein between PLC2 and power supply 5, is respectively equipped with coarse adjustment pressure regulator 6 and fine setting pressure regulator 7; PLC2 is also connected with man-machine interface 1; Transmitter 4 Wei San road current transducers.
System is that different parameter configuration adopts different loaded impedances; Rated current is proposed by user, three-phase and four-line power supply, and each phase load steady current is unified to be set, regulates and controls respectively, and its output waveform is followed input waveform; Autostable range of current determines by loaded impedance, rated current, and its principle is: magnitude of voltage more than pressure regulator output 5V, corresponding complete equipment load current value is all the steady currents within the scope of automatic control.
Select the pressure regulator that precision is higher, during the actual crawl of coarse adjustment pressure regulator 6 one time, Voltage-output changes 2V; The actual crawl primary voltage of fine setting pressure regulator 7 exporting change 0.045V.According to ratio, calculate no matter be that coarse adjustment or fine setting transformer current change all within the error range of controlling separately, the error range of adjustment coarse adjustment, makes range of regulation within " vibration flex point ".
System close-loop feedback signal is taken at AC signal one time, through transmitter 4, small-signal is reached to total tune PLC2, and the total output current of system is set by communication modes by the touch-screen of man-machine interface 1.Control function in automatic stabilizing electric current system, PLC2 mainly completes the logical order of whole system and controls and the control of all pid loops.It is the interchange output of system to be fed back to after current transducer 4 conversion to the input end of PLC2 that constant current is controlled, and gives pi regulator control with given signal after making comparisons.Control results conversion and become corresponding switching value, go drive motor to change the control voltage of saturable reactor, thereby reach the object of unit current stabilization.Balance is controlled because the characteristic of saturable reactor is inconsistent, often causes output current between phase to have difference, therefore, using every as a little closed loop, so just can make current balance type between every phase.During constant current, control the scan period actual measurement primary current value press PLC2 instruction, compare with calculated value in real time, automatically adjust actual current, the object of the automatic control of deviation when reaching constant current.
Concrete operating process is: native system adopts the current transformer 9 of 3 0.2S levels, and no-load voltage ratio is respectively 1200:5; 1500:5; 1600:5; 2000; 5, wherein input and output electric current is linear relationship, and 4 the hexadecimal digit H0000s of the initialization of passage in memory buffer BFM#0 control.1, the four character control channel 4 of first character control channel, the mode that each character is set is as follows:
O=0: preset range (10 to 10V) O=2: preset range (arrive+20mA of 20mA)
O=1: preset range (arrive+20mA of+4mA) O=3: pathway closure OFF
Reading in BFM#30 for No. ID of the special functional module of 0 position, and be kept in the D4 of master unit, relatively whether this value is affiliated host CPU with checking module, and M1 becomes NO in this way.H3111 writes the BFM#0 of host CPU, sets up analog input channel (CH1, CH2, CH3), actual acquisition to CH1, CH2, the numerical value of CH3 passage be placed on respectively D0, D1, in D2 register.The comparison order in PLC has been applied in this invention cleverly, makes to comprise coarse adjustment and the fine setting that a little closed-loop system has realized pressure regulator in large closed-loop system, makes electric current autostable.1.05 times that in channel C H1, CH2, CH3, first carry out respectively measured value and current setting value, setting value compare, if measured value is less than setting value, and drive motor forward, coarse adjustment pressure regulator 6 boosts, and transformer 8 output currents increase; If measured value is greater than setting value, drive motor reversion, 6 step-downs of coarse adjustment pressure regulator, transformer 8 output currents reduce; If measured value is more than or equal to setting value and is less than or equal to 1.05 times of setting value, start the auxiliary reclay of little closed loop, little closed loop is started working.Measured value in CH1, CH2, CH3 passage compares with current setting value, setting value 1.02 times respectively again afterwards, if measured value is less than setting value, drives fine setting motor forward, and fine setting pressure regulator 7 boosts, and transformer 8 output currents increase; If measured value is greater than 1.02 times of setting value, drive fine setting motor reversal, 7 step-downs of fine setting pressure regulator, transformer 8 output currents reduce; If when measured value is more than or equal to setting value and is less than or equal to 1.02 times of setting value, system realizes current stabilization.
Claims (7)
1. large electric current automatic steady current control method for switchgear test, comprises the following steps:
electric power outputting current is through rising current transformer transformation, and the current signal of current transformer collection is given transmitter and is converted to simulating signal, and A/D converter is converted to simulating signal the digital signal of PLC, i.e. real-time sampling X;
pLC compares above-mentioned real-time sampling X with pre-set rated current parameter A 1, first judge A1≤X≤A1(1+ △ X1) whether set up, if set up, continue to judge A1≤X≤A1(1+ △ X2) whether set up, if set up, return to step
, carry out the collection of next data;
If A1≤X≤A1(1+ △ is X1) be false, PLC sends control signal to coarse adjustment pressure regulator, through the coarse adjustment of coarse adjustment pressure regulator, arrives A1≤X≤A1(1+ △ X1) set up; If A1≤X≤A1(1+ △ is X2) be false, through fine setting pressure regulator, be fine-tuning to A1≤X≤A1(1+ △ X2) set up;
Wherein, △ X1 is the large percentage error of rated current parameter A 1, and △ X2 is the little percentage error of rated current parameter A 1.
2. switchgear test as claimed in claim 1, by large electric current automatic steady current control method, is characterized in that: described step
large percentage error △ X1≤5% of middle rated current parameter A 1; Little percentage error △ X2≤2% of rated current parameter A 1.
3. the test of the switchgear described in claim 1 or 2, by large electric current automatic steady current control method, is characterized in that: described step
the method of work of middle PLC is that, during coarse adjustment, when X<A1, PLC drives the motor forward of coarse adjustment pressure regulator, as X> A1(1+ △ X1) time, PLC drives the motor reversal of coarse adjustment pressure regulator.
4. the test of the switchgear described in claim 1 or 2, by large electric current automatic steady current control method, is characterized in that: described step
the method of work of middle PLC is that, during fine setting, when X<A1, PLC drives the motor forward of fine setting pressure regulator, as X> A1(1+ △ X2) time, PLC drives the motor reversal of fine setting pressure regulator.
5. realize the system of large electric current automatic steady current control method for switchgear test as claimed in claim 1, it is characterized in that: comprise successively the power supply (5) that connects, transformer (8), current transformer (9), transmitter (4), A/D converter (3) and PLC(2), wherein PLC(2) with power supply (5) between be respectively equipped with coarse adjustment pressure regulator (6) and finely tune pressure regulator (7).
6. system as claimed in claim 5, is characterized in that: described PLC(2) be also connected with man-machine interface (1).
7. the system as described in claim 5 or 6, is characterized in that: described transmitter (4) Wei San road current transducer.
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Cited By (2)
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| CN105204500A (en) * | 2015-10-19 | 2015-12-30 | 陕西宝成航空仪表有限责任公司 | Method for debugging front wheel steering control box |
| CN106443096A (en) * | 2016-11-23 | 2017-02-22 | 国网辽宁省电力有限公司电力科学研究院 | Full automatic temperature rise test low-voltage big-current generator and control method thereof |
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