CN208000362U - Low-voltage alternating-current switch on and off examines power factor to test system - Google Patents
Low-voltage alternating-current switch on and off examines power factor to test system Download PDFInfo
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- CN208000362U CN208000362U CN201820137741.8U CN201820137741U CN208000362U CN 208000362 U CN208000362 U CN 208000362U CN 201820137741 U CN201820137741 U CN 201820137741U CN 208000362 U CN208000362 U CN 208000362U
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Abstract
The utility model is related to a kind of low-voltage alternating-current switch on and off, and power factor to be examined to test system, be made of basic circuit and featured circuit, feature is:Featured circuit includes that PLC is also electrically connected isolating amplifier circuit A, isolating amplifier circuit B, DSP, isolating amplifier circuit A electrical connection prime load impedances and IGBT arrays A, isolating amplifier circuit B electrical connection successive load impedances and IGBT arrays B, DSP are electrically connected examined low-voltage alternating-current by current detection module, voltage detection module and switch.Also disclose its test method.Realize power factor intelligent test, mainly instead of graphing method, extra power supply or DC component method, test process is simple, test scope is big, measuring accuracy is high, test result deviation is small, chopper switch manual switching load impedance is substituted, it is easy to operate, automatization level is high, highly reliable.
Description
Technical field
The utility model is related to a kind of low-voltage alternating-current switch on and off, and power factor to be examined to test system.
Background technology
Low-voltage alternating-current switch is that the equipment such as control device of electric motor, frequency converter, illumination sign protective device are important
Component, play a dual role of control and protection in power grid.Break-make inspection is low-voltage alternating-current switching mode specimen test
Important inspection project, for examining it to connect the ability with breaking current.Existing make-break capacity verifying attachment uses chopper switch
Manual switching load impedance, complicated for operation, automatization level is low, poor reliability, circuit power factor test is by graphing method, attached
Method or DC component method are powered up, test process is complicated, test scope is small, measuring accuracy is low, test result deviation is larger.
Utility model content
Above-mentioned in order to solve the problems, such as, the utility model provides a kind of low-voltage alternating-current switch on and off inspection power factor
Test system and test method acquire experiment process voltage and current signal, by operation by digital signal processor (DSP)
Test circuit whole circuit power factor is obtained after processing, solves power factor test difficulty, test in current break-make checkout procedure
As a result the problems such as precision is low lays the foundation for low-voltage alternating-current switch on and off inspection technology intelligent development.
Technical solution adopted by the utility model to solve its technical problems is:A kind of low-voltage alternating-current switch on and off inspection work(
Rate factor tests system, is made of basic circuit and featured circuit, and basic circuit includes being electrically connected first by experiment power supply sequence
Switchgear, impact test transformer, prime load impedance and IGBT arrays A, second switch cabinet, prime accompany examination, are examined low pressure
The low-voltage alternating-current switch on and off that alternating-current switch, rear class accompany examination, successive load impedance and IGBT arrays B, earthing or grounding means to constitute is examined
Hookup, PLC are electrically connected first switch cabinet, communication module, power module, control panel, programming interface, second switch
Cabinet, relay A, relay C, time detection module, relay B, communication module sequence electrical connection industrial computer, printer,
Relay A electrical connection prime accompanies examination, and relay B is electrically connected rear class and accompanies examination, relay C, time detection module be electrically connected by
Low-voltage alternating-current switch, feature is examined to be:Featured circuit includes that PLC is also electrically connected isolating amplifier circuit A, isolation amplification electricity
Road B, DSP, isolating amplifier circuit A electrical connection prime load impedances and IGBT array A, isolating amplifier circuit B electrical connection rear classes are negative
It carries impedance and IGBT arrays B, DSP is electrically connected examined low-voltage alternating-current by current detection module, voltage detection module and opens
It closes.
Wherein:Successive load impedance and IGBT array B structures include that sequentially being electrically connected to rear class accompanies the resistance loop of examination, electricity
Feel circuit, resistance loop includes that each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, the both ends resistance R6 pass through correspondence
IGBT1, IGBT7, IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 be connected in parallel, and by
Isolating amplifier circuit B signal output end is accessed by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 respectively, resistance R5 right ends
It is connect by IGBT6 with resistance R6 left ends, and is accessed by B6 by isolating amplifier circuit B signal output end, inductor loop includes
Each both ends inductance L1, L2, L3, L4, L5, L6 are by corresponding IGBT12, IGBT17, IGBT13, IGBT18, IGBT14,
IGBT19, IGBT15, IGBT20, IGBT16, IGBT21 are connected in parallel, and are led to respectively by isolating amplifier circuit B signal output end
B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 access are crossed, inductance L5 right ends pass through with inductance L6 left ends
IGBT22 connections, and accessed by B22 by isolating amplifier circuit B signal output end.
Wherein:Prime load impedance and IGBT array A structural principles and successive load impedance and IGBT array B structure principles
Identical, prime accompanies examination to accompany examination structure identical with rear class.
Wherein:Resistance number in successive load impedance and IGBT array B structures and corresponding IGBT number changeable, electricity
Feel number and corresponding IGBT number also changeable.
Wherein:Include mainly switch of the power supply module, first switch cabinet control button, the control of second switch cabinet on control panel
Button, touch screen.
It is easy to understand and introduces a kind of test method that low-voltage alternating-current switch on and off examines power factor to test system, packet
First determine that the wiring of low-voltage alternating-current switch is correct before including test, feature is:Press the switch of the power supply module on control panel, root
Anticipating power factor is arranged in type according to the experiment, presses the first switch cabinet control button on control panel, and PLC sends control instruction
First switch cabinet closes a floodgate, and presses the second switch cabinet control button on control panel, and PLC sends control instruction second switch cabinet and closes
Lock, start button in touch screen on point operation control panel, it is as follows that software program automatically controls power factor test process, connects examination
It when testing, closes or sequence is that prime accompanies examination, rear class to accompany examination, low-voltage alternating-current switch when separating brake, by the after the completion of power factor test
Two switchgears, first switch cabinet, power module are sequentially opened, PLC and DSP collecting tests system voltage, electric current in test process
And time signal, industrial computer is fed back to through communication module, realizes that data show, store, through printer print result.
Wherein:Software program automatically controls power factor test, asks power factor, test to start with bidirectional pulse counting method
Low-voltage alternating-current switch is off, and does not have electric current, more two neighboring voltage peak to reach steady in floating voltage in circuit
After state, M points send first pulse signal at the time of voltage signal is from negative value to zero, then in each voltage from negative value
Send pulse signal at the time of to zero, until loss of voltage it is previous from negative value to zero at the time of Q points, lead in test loop
Enter voltage signal after electric current to disappear, more two neighboring current peak after loop current signals reach stable state electric current from negative value to
N sends a pulse signal to moment N+1 at the time of zero, and it is the test current period to calculate pulse signal interval T, in N
Moment to moment Q point direction, which is simulated using T as the period, calculates pulse signal, until the P moment ends before electric current initial position, P points
To the time corresponding phase angle of Q pointsCosine value be the test loop power factorSpecific formula for calculation is
In formula, t1The time between M points and N points, unit ms;t2
The time between M points and Q points, unit ms;t3The time between P points and N points, unit ms;T is the sinusoidal ac period,
Unit is ms;2 π are sinusoidal ac period angle, π=180 °.
The utility model has the beneficial effects that:The utility model realize low-voltage alternating-current switch on and off checkout procedure power because
Number intelligent test, mainly instead of graphing method, extra power supply or DC component method, test process is simple, test scope is big,
Measuring accuracy is high, test result deviation is small, while adjusting test circuit power factor using IGBT arrays, substitutes chopper switch
Manual switching load impedance, it is easy to operate, automatization level is high, highly reliable.
Description of the drawings
The utility model is described further with reference to the accompanying drawings and detailed description.
Fig. 1 is that low-voltage alternating-current switch on and off examines power factor test system structure figure;
Fig. 2 is that call through test low-voltage alternating-current switch accompanies examination control signal sequence diagram with prime;
Fig. 3 is that low-voltage alternating-current switch is tested in disjunction and prime accompanies examination control signal sequence diagram;
Fig. 4 is that charge passed low-voltage alternating-current switch accompanies examination control signal sequence diagram with prime;
The impedance of Fig. 5 successive loads and IGBT array B schematic diagrams;
Fig. 6 bidirectional pulse counting method power factor test schematic diagrams.
In figure:1. first switch cabinet, 2. impact test transformers, 3. second switch cabinets, 4. prime load impedances and IGBT
Array A, 5. industrial computers, 6. communication modules, 7. power modules, 8. control panels, 9. programming interface, 10. printers,
11.DSP (digital signal processor), 12. primes accompany examination, 13. relay A, 14. current detection modules, 15. earthing or grounding means, and 16.
Successive load impedance and IGBT arrays B, 17. rear classes accompany examination, 18. low-voltage alternating-currents switch, 19. time detection modules, the inspection of 20. voltages
Module is surveyed, 21. relay B, 22. isolating amplifier circuit B, 24. relay C, 25. resistance loops, 26. inductor loops, 30. are isolated
Amplifying circuit A, 100.PLC (programmable controller).
Specific implementation mode
First embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test system, by basic circuit and feature
Circuit is constituted, and basic circuit includes sequentially being electrically connected first switch cabinet 1, impact test transformer 2, prime by experiment power supply 23 to bear
Carry impedance and IGBT arrays A4, second switch cabinet 3, prime accompany examination 12, be examined low-voltage alternating-current switch 18, rear class accompanies examination 17, after
The 18 break-make check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT arrays B16, earthing or grounding means 15 are constituted, PLC100
Be electrically connected first switch cabinet 1, communication module 6, power module 7, control panel 8, programming interface 9, second switch cabinet 3, after
Electric appliance A13, relay C24, time detection module 19, relay B21, communication module 6 are sequentially electrically connected industrial computer 5, beat
Print machine 10, relay A13 electrical connections prime accompany examination 12, relay B21 electrical connections rear class to accompany examination 17, relay C24, time detection
Module 19 is electrically connected examined low-voltage alternating-current switch 18, and feature is:Featured circuit includes that PLC is also electrically connected isolation
Amplifying circuit A30, isolating amplifier circuit B22, DSP11 (digital signal processor), isolating amplifier circuit A30 electrical connection primes are negative
Carry impedance and IGBT array A4, isolating amplifier circuit B22 electrical connection successive load impedances and IGBT arrays B16, DSP11 (number
Signal processor) examined low-voltage alternating-current switch 18 is electrically connected by current detection module 14, voltage detection module 20.
Second embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test system, by basic circuit and feature
Circuit is constituted, and basic circuit includes sequentially being electrically connected first switch cabinet 1, impact test transformer 2, prime by experiment power supply 23 to bear
Carry impedance and IGBT arrays A4, second switch cabinet 3, prime accompany examination 12, be examined low-voltage alternating-current switch 18, rear class accompanies examination 17, after
The 18 break-make check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT arrays B16, earthing or grounding means 15 are constituted, PLC100
Be electrically connected first switch cabinet 1, communication module 6, power module 7, control panel 8, programming interface 9, second switch cabinet 3, after
Electric appliance A13, relay C24, time detection module 19, relay B21, communication module 6 are sequentially electrically connected industrial computer 5, beat
Print machine 10, relay A13 electrical connections prime accompany examination 12, relay B21 electrical connections rear class to accompany examination 17, relay C24, time detection
Module 19 is electrically connected examined low-voltage alternating-current switch 18, and feature is:Featured circuit includes that PLC is also electrically connected isolation
Amplifying circuit A30, isolating amplifier circuit B22, DSP11 (digital signal processor), isolating amplifier circuit A30 electrical connection primes are negative
Carry impedance and IGBT array A4, isolating amplifier circuit B22 electrical connection successive load impedances and IGBT arrays B16, DSP11 (number
Signal processor) examined low-voltage alternating-current switch 18 is electrically connected by current detection module 14, voltage detection module 20.
Wherein:Successive load impedance and IGBT array B16 structures include that sequence is electrically connected to the resistance time that rear class accompanies examination 17
Road 25, inductor loop 26, resistance loop 25 include each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 two
End is by corresponding IGBT1, IGBT7, and IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 are in parallel
Connection, and accessed respectively by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 by isolating amplifier circuit B signal output end,
Resistance R5 right ends are connect with resistance R6 left ends by IGBT6, and are accessed by B6 by isolating amplifier circuit B22 signal output ends,
Inductor loop 26 includes the both ends each inductance L1, L2, L3, L4, L5, L6 by corresponding IGBT12, IGBT17, IGBT13,
IGBT18, IGBT14, IGBT19, IGBT15, IGBT20, IGBT16, IGBT21 are connected in parallel, and by isolating amplifier circuit B22
Signal output end is accessed by B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 respectively, inductance L5 right ends and electricity
Sense L6 left ends are connected by IGBT22, and are accessed by B22 by isolating amplifier circuit B22 signal output ends.
3rd embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test system, by basic circuit and feature
Circuit is constituted, and basic circuit includes sequentially being electrically connected first switch cabinet 1, impact test transformer 2, prime by experiment power supply 23 to bear
Carry impedance and IGBT arrays A4, second switch cabinet 3, prime accompany examination 12, be examined low-voltage alternating-current switch 18, rear class accompanies examination 17, after
The 18 break-make check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT arrays B16, earthing or grounding means 15 are constituted, PLC100
Be electrically connected first switch cabinet 1, communication module 6, power module 7, control panel 8, programming interface 9, second switch cabinet 3, after
Electric appliance A13, relay C24, time detection module 19, relay B21, communication module 6 are sequentially electrically connected industrial computer 5, beat
Print machine 10, relay A13 electrical connections prime accompany examination 12, relay B21 electrical connections rear class to accompany examination 17, relay C24, time detection
Module 19 is electrically connected examined low-voltage alternating-current switch 18, and feature is:Featured circuit includes that PLC is also electrically connected isolation
Amplifying circuit A30, isolating amplifier circuit B22, DSP11 (digital signal processor), isolating amplifier circuit A30 electrical connection primes are negative
Carry impedance and IGBT array A4, isolating amplifier circuit B22 electrical connection successive load impedances and IGBT arrays B16, DSP11 (number
Signal processor) examined low-voltage alternating-current switch 18 is electrically connected by current detection module 14, voltage detection module 20.
Wherein:Successive load impedance and IGBT array B16 structures include that sequence is electrically connected to the resistance time that rear class accompanies examination 17
Road 25, inductor loop 26, resistance loop 25 include each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 two
End is by corresponding IGBT1, IGBT7, and IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 are in parallel
Connection, and accessed respectively by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 by isolating amplifier circuit B signal output end,
Resistance R5 right ends are connect with resistance R6 left ends by IGBT6, and are accessed by B6 by isolating amplifier circuit B22 signal output ends,
Inductor loop 26 includes the both ends each inductance L1, L2, L3, L4, L5, L6 by corresponding IGBT12, IGBT17, IGBT13,
IGBT18, IGBT14, IGBT19, IGBT15, IGBT20, IGBT16, IGBT21 are connected in parallel, and by isolating amplifier circuit B22
Signal output end is accessed by B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 respectively, inductance L5 right ends and electricity
Sense L6 left ends are connected by IGBT22, and are accessed by B22 by isolating amplifier circuit B22 signal output ends.
Wherein:Prime load impedance and IGBT array A4 structural principles and successive load impedance and IGBT array B16 structures
Principle is identical, and prime accompanies examination 12 to accompany 17 structures of examination identical with rear class.
Fourth embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test system, by basic circuit and feature
Circuit is constituted, and basic circuit includes sequentially being electrically connected first switch cabinet 1, impact test transformer 2, prime by experiment power supply 23 to bear
Carry impedance and IGBT arrays A4, second switch cabinet 3, prime accompany examination 12, be examined low-voltage alternating-current switch 18, rear class accompanies examination 17, after
The 18 break-make check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT arrays B16, earthing or grounding means 15 are constituted, PLC100
Be electrically connected first switch cabinet 1, communication module 6, power module 7, control panel 8, programming interface 9, second switch cabinet 3, after
Electric appliance A13, relay C24, time detection module 19, relay B21, communication module 6 are sequentially electrically connected industrial computer 5, beat
Print machine 10, relay A13 electrical connections prime accompany examination 12, relay B21 electrical connections rear class to accompany examination 17, relay C24, time detection
Module 19 is electrically connected examined low-voltage alternating-current switch 18, and feature is:Featured circuit includes that PLC is also electrically connected isolation
Amplifying circuit A30, isolating amplifier circuit B22, DSP11 (digital signal processor), isolating amplifier circuit A30 electrical connection primes are negative
Carry impedance and IGBT array A4, isolating amplifier circuit B22 electrical connection successive load impedances and IGBT arrays B16, DSP11 (number
Signal processor) examined low-voltage alternating-current switch 18 is electrically connected by current detection module 14, voltage detection module 20.
Wherein:Successive load impedance and IGBT array B16 structures include that sequence is electrically connected to the resistance time that rear class accompanies examination 17
Road 25, inductor loop 26, resistance loop 25 include each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 two
End is by corresponding IGBT1, IGBT7, and IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 are in parallel
Connection, and accessed respectively by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 by isolating amplifier circuit B signal output end,
Resistance R5 right ends are connect with resistance R6 left ends by IGBT6, and are accessed by B6 by isolating amplifier circuit B22 signal output ends,
Inductor loop 26 includes the both ends each inductance L1, L2, L3, L4, L5, L6 by corresponding IGBT12, IGBT17, IGBT13,
IGBT18, IGBT14, IGBT19, IGBT15, IGBT20, IGBT16, IGBT21 are connected in parallel, and by isolating amplifier circuit B22
Signal output end is accessed by B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 respectively, inductance L5 right ends and electricity
Sense L6 left ends are connected by IGBT22, and are accessed by B22 by isolating amplifier circuit B22 signal output ends.
Wherein:Prime load impedance and IGBT array A4 structural principles and successive load impedance and IGBT array B16 structures
Principle is identical, and prime accompanies examination 12 to accompany 17 structures of examination identical with rear class.
Wherein:Resistance number in successive load impedance and IGBT array B16 structures and corresponding IGBT number changeable,
Inductance number and corresponding IGBT number also changeable.
5th embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test system, by basic circuit and feature
Circuit is constituted, and basic circuit includes sequentially being electrically connected first switch cabinet 1, impact test transformer 2, prime by experiment power supply 23 to bear
Carry impedance and IGBT arrays A4, second switch cabinet 3, prime accompany examination 12, be examined low-voltage alternating-current switch 18, rear class accompanies examination 17, after
The 18 break-make check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT arrays B16, earthing or grounding means 15 are constituted, PLC100
Be electrically connected first switch cabinet 1, communication module 6, power module 7, control panel 8, programming interface 9, second switch cabinet 3, after
Electric appliance A13, relay C24, time detection module 19, relay B21, communication module 6 are sequentially electrically connected industrial computer 5, beat
Print machine 10, relay A13 electrical connections prime accompany examination 12, relay B21 electrical connections rear class to accompany examination 17, relay C24, time detection
Module 19 is electrically connected examined low-voltage alternating-current switch 18, and feature is:Featured circuit includes that PLC is also electrically connected isolation
Amplifying circuit A30, isolating amplifier circuit B22, DSP11 (digital signal processor), isolating amplifier circuit A30 electrical connection primes are negative
Carry impedance and IGBT array A4, isolating amplifier circuit B22 electrical connection successive load impedances and IGBT arrays B16, DSP11 (number
Signal processor) examined low-voltage alternating-current switch 18 is electrically connected by current detection module 14, voltage detection module 20.
Wherein:Successive load impedance and IGBT array B16 structures include that sequence is electrically connected to the resistance time that rear class accompanies examination 17
Road 25, inductor loop 26, resistance loop 25 include each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 two
End is by corresponding IGBT1, IGBT7, and IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 are in parallel
Connection, and accessed respectively by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 by isolating amplifier circuit B signal output end,
Resistance R5 right ends are connect with resistance R6 left ends by IGBT6, and are accessed by B6 by isolating amplifier circuit B22 signal output ends,
Inductor loop 26 includes the both ends each inductance L1, L2, L3, L4, L5, L6 by corresponding IGBT12, IGBT17, IGBT13,
IGBT18, IGBT14, IGBT19, IGBT15, IGBT20, IGBT16, IGBT21 are connected in parallel, and by isolating amplifier circuit B22
Signal output end is accessed by B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 respectively, inductance L5 right ends and electricity
Sense L6 left ends are connected by IGBT22, and are accessed by B22 by isolating amplifier circuit B22 signal output ends.
Wherein:Prime load impedance and IGBT array A4 structural principles and successive load impedance and IGBT array B16 structures
Principle is identical, and prime accompanies examination 12 to accompany 17 structures of examination identical with rear class.
Wherein:Resistance number in successive load impedance and IGBT array B16 structures and corresponding IGBT number changeable,
Inductance number and corresponding IGBT number also changeable.
Wherein:Include mainly the switch of power module 7,1 control button of first switch cabinet, second switch cabinet 3 on control panel 8
Control button, touch screen.
Sixth embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, a kind of low-voltage alternating-current switch on and off inspection power factor test system
Test method, including first the wiring of determining low-voltage alternating-current switch 18 is correct before test, and feature is:It presses on control panel 8
Power module 7 switch, according to experiment type be arranged anticipating power factor, such as 0.35, press the first switch on control panel 8
1 control button of cabinet, PLC100 send control instruction first switch cabinet 1 and close a floodgate, and the second switch cabinet 3 pressed on control panel 8 is controlled
Button processed, PLC100 send control instruction second switch cabinet 3 and close a floodgate, start button, software in touch screen on point operation control panel 8
Procedure auto-control power factor test process is as follows, when call through test, closes or sequence is that prime accompanies examination 12, rear class when separating brake
Examination 17, low-voltage alternating-current switch 18 are accompanied, it is suitable by second switch cabinet 3, first switch cabinet 1, power module 7 after the completion of power factor test
Sequence disconnects, PLC100 and DSP11 collecting tests system voltage, electric current and time signal in test process are fed back through communication module 6
To industrial computer 5, realize that data show, store, through 10 print result of printer.
7th embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, a kind of low-voltage alternating-current switch on and off inspection power factor test system
Test method, including first the wiring of determining low-voltage alternating-current switch 18 is correct before test, and feature is:It presses on control panel 8
Power module 7 switch, according to experiment type be arranged anticipating power factor, such as 0.38, press the first switch on control panel 8
1 control button of cabinet, PLC100 send control instruction first switch cabinet 1 and close a floodgate, and the second switch cabinet 3 pressed on control panel 8 is controlled
Button processed, PLC100 send control instruction second switch cabinet 3 and close a floodgate, start button, software in touch screen on point operation control panel 8
Procedure auto-control power factor test process is as follows, when call through test, closes or sequence is that prime accompanies examination 12, rear class when separating brake
Examination 17, low-voltage alternating-current switch 18 are accompanied, it is suitable by second switch cabinet 3, first switch cabinet 1, power module 7 after the completion of power factor test
Sequence disconnects, PLC100 and DSP11 collecting tests system voltage, electric current and time signal in test process are fed back through communication module 6
To industrial computer 5, realize that data show, store, through 10 print result of printer.
Wherein:Software program automatically controls power factor test, asks power factor, test to start with bidirectional pulse counting method
Low-voltage alternating-current switch 18 is off, and does not have electric current, more two neighboring voltage peak to reach in floating voltage in circuit
After stable state, M points send first pulse signal at the time of voltage signal is from negative value to zero, then in each voltage from negative
Send pulse signal at the time of being worth zero, until loss of voltage it is previous from negative value to zero at the time of Q points, in test loop
Voltage signal after electric current is passed through to disappear, more two neighboring current peak after loop current signals reach stable state electric current from negative value
A pulse signal is sent to moment N+1 to N at the time of zero, it is the test current period to calculate pulse signal interval T,
N-hour to moment Q point direction, which is simulated using T as the period, calculates pulse signal, until the P moment ends before electric current initial position, P points
To the time corresponding phase angle of Q pointsCosine value be the test loop power factorSpecific formula for calculation is
In formula, t1The time between M points and N points, unit ms;t2
The time between M points and Q points, unit ms;t3The time between P points and N points, unit ms;T is the sinusoidal ac period,
Unit is ms;2 π are sinusoidal ac period angle, π=180 °.
Claims (9)
1. a kind of low-voltage alternating-current switch on and off examines power factor to test system, it is made of basic circuit and featured circuit, substantially
Circuit includes by experiment power supply sequence electrical connection first switch cabinet, impact test transformer, prime load impedance and IGBT arrays
A, second switch cabinet, prime accompany examination, examined low-voltage alternating-current switch, rear class to accompany examination, successive load impedance and IGBT arrays B, connect
The low-voltage alternating-current switch on and off check test circuit that ground device is constituted, PLC are electrically connected first switch cabinet, communication module, electricity
Source module, control panel, programming interface, second switch cabinet, relay A, relay C, time detection module, relay B, communication
Sequence of modules is electrically connected industrial computer, printer, and relay A electrical connections prime accompanies examination, relay B electrical connections rear class to accompany examination,
Relay C, time detection module are electrically connected examined low-voltage alternating-current switch, are characterized in that:Featured circuit includes that PLC also divides
Not electricity Lian Jie isolating amplifier circuit A, isolating amplifier circuit B, DSP, isolating amplifier circuit A electrical connection prime load impedance and IGBT
Array A, isolating amplifier circuit B electrical connection successive load impedances and IGBT arrays B, DSP are examined by current detection module, voltage
It surveys module and is electrically connected examined low-voltage alternating-current switch.
2. a kind of low-voltage alternating-current switch on and off according to claim 1 examines power factor to test system, it is characterised in that:
Successive load impedance and IGBT array B structures include sequentially being electrically connected to rear class the resistance loop of examination, inductor loop, resistance is accompanied to return
Road includes each resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, the both ends resistance R6 by corresponding IGBT1, IGBT7,
IGBT2, IGBT8, IGBT3, IGBT9, IGBT4, IGBT10, IGBT5, IGBT11 are connected in parallel, and are believed by isolating amplifier circuit B
Number output end is accessed by B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 respectively, and resistance R5 right ends are logical with resistance R6 left ends
Cross IGBT6 connections, and accessed by B6 by isolating amplifier circuit B signal output end, inductor loop include each inductance L1, L2,
The both ends L3, L4, L5, L6 are by corresponding IGBT12, IGBT17, IGBT13, IGBT18, IGBT14, IGBT19, IGBT15,
IGBT20, IGBT16, IGBT21 are connected in parallel, and by isolating amplifier circuit B signal output end respectively by B12, B13, B14,
B15, B16, B17, B18, B19, B20, B21 are accessed, and inductance L5 right ends are connect with inductance L6 left ends by IGBT22, and by being isolated
Amplifying circuit B signal output end is accessed by B22.
3. a kind of low-voltage alternating-current switch on and off according to claim 1 examines power factor to test system, it is characterised in that:
Prime load impedance and IGBT array A structural principles are identical as successive load impedance and IGBT array B structure principles, and prime accompanies examination
Accompany examination structure identical with rear class.
4. a kind of low-voltage alternating-current switch on and off according to claim 1 examines power factor to test system, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structures and corresponding IGBT number changeable, inductance number with it is corresponding
IGBT number also changeable.
5. a kind of low-voltage alternating-current switch on and off according to claim 2 examines power factor to test system, it is characterised in that:
Prime load impedance and IGBT array A structural principles are identical as successive load impedance and IGBT array B structure principles, and prime accompanies examination
Accompany examination structure identical with rear class.
6. a kind of low-voltage alternating-current switch on and off according to claim 2 examines power factor to test system, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structures and corresponding IGBT number changeable, inductance number with it is corresponding
IGBT number also changeable.
7. a kind of low-voltage alternating-current switch on and off according to claim 3 examines power factor to test system, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structures and corresponding IGBT number changeable, inductance number with it is corresponding
IGBT number also changeable.
8. a kind of low-voltage alternating-current switch on and off according to claim 5 examines power factor to test system, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structures and corresponding IGBT number changeable, inductance number with it is corresponding
IGBT number also changeable.
9. any low-voltage alternating-current switch on and off according to claim 1-8 examines power factor to test system, feature
It is:Include mainly switch of the power supply module on control panel, first switch cabinet control button, second switch cabinet control button, touch
Touch screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820137741.8U CN208000362U (en) | 2018-01-26 | 2018-01-26 | Low-voltage alternating-current switch on and off examines power factor to test system |
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| CN201820137741.8U CN208000362U (en) | 2018-01-26 | 2018-01-26 | Low-voltage alternating-current switch on and off examines power factor to test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082673A (en) * | 2018-01-26 | 2019-08-02 | 煤科集团沈阳研究院有限公司 | Low-voltage alternating-current switch on and off examines power factor test macro and test method |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082673A (en) * | 2018-01-26 | 2019-08-02 | 煤科集团沈阳研究院有限公司 | Low-voltage alternating-current switch on and off examines power factor test macro and test method |
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Effective date of registration: 20220707 Address after: 113122 No.11 Binhe Road, Shenfu demonstration area, Fushun City, Liaoning Province Patentee after: Fushun China Coal Science & Engineering Testing Center Co.,Ltd. Patentee after: Shenyang Research Institute Co.,Ltd. Address before: 113122 No.11 Binhe Road, Shenfu demonstration area, Fushun City, Liaoning Province Patentee before: Shenyang Research Institute Co.,Ltd. |
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