CN203689201U - Automatic heavy current stabilization control system for switchgear test - Google Patents
Automatic heavy current stabilization control system for switchgear test Download PDFInfo
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- CN203689201U CN203689201U CN201320820971.1U CN201320820971U CN203689201U CN 203689201 U CN203689201 U CN 203689201U CN 201320820971 U CN201320820971 U CN 201320820971U CN 203689201 U CN203689201 U CN 203689201U
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Abstract
The utility model provides an automatic heavy current stabilization control system for a switchgear test. According to the system, a contact voltage regulator, a heavy current transformer, a transmitter and a high anti-interference electronic circuit form a loop-locked automatic regulation system for automatically tracking set test current, so that automatic stabilization of heavy current for a temperature rise test is achieved, a main performance index of the system complies with the relevant national standard, and a requirement of the temperature rise test is met; the automatic current stabilization system for the temperature rise test achieves the automatic stabilization of the test current, and is convenient to use, simple to operate and complete in function; the labor intensity of test personnel is reduced; the working efficiency is improved; and a negative effect of a human factor on a test result can be limited effectively.
Description
Technical field
The utility model relates to a kind of automatic steady current control field, is specifically related to the large electric current automatic steady current control system of a kind of switchgear 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 the on-the-spot switchgear excess Temperature of part causes Frequent Accidents.This just forces switchgear manufacturer or research institution at laboratory simulation site environment, is passed to the temperature characterisitic of stable electric current research switchgear and is changed whether meet relevant national standard by switching devices.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 control saturable reactor to regulate the method for 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, reduce work efficiency.
Utility model content
The utility model, for problems of the prior art, provides a kind of switchgear test large electric current automatic steady current control system.
Switchgear of the present utility model large electric current automatic steady current control system for test, it comprises the power supply, transformer, current transformer, transmitter, A/D converter and the PLC that connect 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.
This system is not made up of closed loop automatic regulating system contact type voltage regulator, strong current transformer, transmitter and high anti-interference electronic circuit, carries out from motion tracking the test current setting, thereby has realized the autostable of the large electric current of temperature rise test.
The relative prior art of the utility model has the following advantages:
1, the utility model is the autostable that realizes electric current on the basis of simulated field electric current, provide and stablize required electric current by the mode of test, adopt instrument and meter to measure the temperature rise of test product, whether check product meets standard criterion, has improved the stability of electric current.
2, the utility model can effectively limit the negative interference of people to test findings, has avoided because excess Temperature causes Frequent Accidents, and reliability is high.
3, the utility model, 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 close friend, operation is directly perceived simple, multiple functional.
4, the utility model, without synchronizing signal, without phase sequence requirement, becomes system and is easy to debugging.
5, the utility model is simple to operate, can be easily and computing machine or miscellaneous equipment communication.
6, the utility model can be realized on the basis of automatic steady current, also has traditional manual voltage regulation mode.
Accompanying drawing explanation
Fig. 1 is control system schematic diagram of the present utility model;
Fig. 2 is control flow chart of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, switchgear test of the present utility model is described in further detail by large electric current automatic steady current control system.
The large electric current automatic steady current control system for test of switchgear as shown in Figure 1, it comprises the power supply 5, transformer 8, current transformer 9, transmitter 4, A/D converter 3 and the PLC2 that connect 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.
The large electric current automatic steady current control method for test of switchgear as shown in Figure 2, comprises the following steps:
If A1≤X≤A1(1+ △ is X1) be false, PLC sends control signal to coarse adjustment pressure regulator, arrives A1≤X≤A1(1+ △ X1 through the coarse adjustment of coarse adjustment pressure regulator) set up; If A1≤X≤A1(1+ △ is X2) be false, be fine-tuning to A1≤X≤A1(1+ △ X2 through fine setting pressure regulator) 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, when coarse adjustment, in the time of 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, when fine setting, in the time of 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.
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, when 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 coarse adjustment or fine setting transformer current change all separately control error range within, adjustment coarse adjustment error range, make 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 logical order control and all pid loop control of whole system.Constant current control is the input end that the interchange output of unit is fed back to after current transducer 4 converts to PLC2, 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 control, 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.When constant current, control the scan period actual measurement primary current value of press PLC2 instruction, compare with setting 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 the initialization of passage is controlled by 4 hexadecimal digit H0000 in memory buffer BFM#0.1, 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
Read in by BFM#30 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 a little closed-loop system in large closed-loop system and realized coarse adjustment and the fine setting of pressure regulator, 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; starting the auxiliary reclay of little closed loop; little closed loop is started working. the 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; drive fine setting motor forward; fine setting pressure regulator 7 boosts, 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 (3)
1. large electric current automatic steady current control system for switchgear test, 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).
2. switchgear as claimed in claim 1 is tested by large electric current automatic steady current control system, it is characterized in that: described PLC(2) be also connected with man-machine interface (1).
3. switchgear as claimed in claim 1 or 2 is tested by large electric current automatic steady current control system, it is characterized in that: described transmitter (4) Wei San road current transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320820971.1U CN203689201U (en) | 2013-12-15 | 2013-12-15 | Automatic heavy current stabilization control system for switchgear test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320820971.1U CN203689201U (en) | 2013-12-15 | 2013-12-15 | Automatic heavy current stabilization control system for switchgear test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203689201U true CN203689201U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320820971.1U Expired - Fee Related CN203689201U (en) | 2013-12-15 | 2013-12-15 | Automatic heavy current stabilization control system for switchgear test |
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| Country | Link |
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| CN (1) | CN203689201U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-12-15 CN CN201320820971.1U patent/CN203689201U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20191215 |