CN110082673A - Low-voltage alternating-current switch on and off examines power factor test macro and test method - Google Patents
Low-voltage alternating-current switch on and off examines power factor test macro and test method Download PDFInfo
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- CN110082673A CN110082673A CN201810078211.5A CN201810078211A CN110082673A CN 110082673 A CN110082673 A CN 110082673A CN 201810078211 A CN201810078211 A CN 201810078211A CN 110082673 A CN110082673 A CN 110082673A
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- 238000012360 testing method Methods 0.000 title claims abstract description 93
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims description 17
- 238000002474 experimental method Methods 0.000 claims description 11
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- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention relates to a kind of low-voltage alternating-current switch on and off to examine power factor test macro, it is 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 is electrically connected prime load impedance and IGBT array A, isolating amplifier circuit B electrical connection successive load impedance and IGBT array 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 present invention relates to a kind of low-voltage alternating-current switch on and off to examine power factor test macro and test method.
Background technique
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.On-off 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.
Summary of the invention
To solve the above problems, the present invention provides a kind of low-voltage alternating-current switch on and off inspection power factor test
System and test method acquire test process voltage and current signal by digital signal processor (DSP), by calculation process
After obtain test circuit whole circuit power factor, solve in current on-off checkout procedure that power factor test is difficult, test result
The problems such as precision is low lays the foundation for low-voltage alternating-current switch on and off inspection technology intelligent development.
The technical solution adopted by the present invention to solve the technical problems is: a kind of low-voltage alternating-current switch on and off examine power because
Number test macro, is made of basic circuit and featured circuit, and basic circuit includes being electrically connected first switch by experiment power supply sequence
Cabinet, impact test transformer, prime load impedance and IGBT array A, second switch cabinet, prime accompany examination, are examined low-voltage alternating-current
The low-voltage alternating-current switch on and off check test that switch, rear class accompany examination, successive load impedance and IGBT array B, earthing or grounding means to constitute
Circuit, PLC be 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
Device A electrical connection prime accompanies examination, and relay B electrical connection rear class accompanies examination, and relay C, time detection module are electrically connected examined
Low-voltage alternating-current switch, feature is: featured circuit include PLC be also electrically connected isolating amplifier circuit A, isolating amplifier circuit B,
DSP, isolating amplifier circuit A are electrically connected prime load impedance and IGBT array A, isolating amplifier circuit B are electrically connected successive load resistance
Anti- and IGBT array B, DSP are electrically connected examined low-voltage alternating-current by current detection module, voltage detection module and switch.
Wherein: successive load impedance and IGBT array B structure include that sequence is electrically connected to rear class and 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 passes through B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access, resistance R5 right end respectively
It is connect with the left end resistance R6 by IGBT6, and is accessed by isolating amplifier circuit B signal output end by B6, inductor loop includes
The both ends each 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 end passes through with the left end inductance L6
IGBT22 connection, and accessed by isolating amplifier circuit B signal output end by B22.
Wherein: prime load impedance and IGBT array A structural principle and successive load impedance and IGBT array B structure principle
Identical, prime accompanies examination to accompany examination structure identical with rear class.
Wherein: resistance number in successive load impedance and IGBT array B structure and corresponding IGBT several changeable, electricity
Feel number and corresponding IGBT number also changeable.
Wherein: mainly including switch of the power supply module, first switch cabinet control button, the control of second switch cabinet on control panel
Button, touch screen.
A kind of low-voltage alternating-current switch on and off examines the test method of power factor test macro, including first determines before testing low
It presses the wiring of alternating-current switch correct, feature is: pressing the switch of the power supply module on control panel, be arranged according to experiment type pre-
Phase power factor presses the first switch cabinet control button on control panel, and PLC sends control instruction first switch cabinet and closes a floodgate,
The second switch cabinet control button on control panel is pressed, PLC sends control instruction second switch cabinet and closes a floodgate, point operation control panel
Start button in upper touch screen, it is as follows that software program automatically controls power factor test process, when call through test, closes or when separating brake
Sequence is that prime accompanies examination, rear class to accompany examination, low-voltage alternating-current switch, is opened after the completion of power factor test by second switch cabinet, first
Pass cabinet, power module are sequentially opened, PLC and DSP collecting test system voltage, electric current and time signal in test process, through logical
Module feedback is interrogated to industrial computer, realizes that data show, store, through printer print result.
Wherein: software program automatically controls power factor test, seeks power factor with bidirectional pulse counting method, test starts
Low-voltage alternating-current switch is in an off state, and does not have electric current in circuit, more two neighboring voltage peak reaches steady in floating voltage
After state, M point sends first pulse signal at the time of voltage signal is from negative value to zero point, then in each voltage from negative value
Send pulse signal at the time of to zero point, until loss of voltage it is previous from negative value to zero point at the time of Q point, 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 point, and calculating pulse signal interval T is the test current period, 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 point
To the time corresponding phase angle of Q pointCosine value be the test loop power factorSpecific formula for calculation isIn formula, t1The time between M point and N point, unit ms；t2For M point and Q
Time between point, unit ms；t3The time between P point and N point, unit ms；T is sinusoidal ac period, unit ms；
2 π are sinusoidal ac period angle, π=180 °.
The beneficial effects of the present invention are: the present invention realizes the power factor intelligence of low-voltage alternating-current switch on and off checkout procedure
Test, mainly instead of graphing method, extra power supply or DC component method, test process is simple, test scope is big, measuring accuracy
Height, test result deviation are small, while adjusting test circuit power factor using IGBT array, substitute chopper switch manual switching
Load impedance, it is easy to operate, automatization level is high, highly reliable.
Detailed description of the invention
The present invention will be further described 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 and prime accompany examination control signal sequence diagram；
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 and prime accompany examination control signal sequence diagram；
The impedance of Fig. 5 successive load and IGBT array B schematic diagram；
Fig. 6 bidirectional pulse counting method power factor test schematic diagram.
In figure: 1. first switch cabinets, 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 array 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 embodiment
First embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test macro, 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 array 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 on-off check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT array 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 connection prime accompany examination 12, and relay B21 electrical connection rear class accompanies 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), it is negative that isolating amplifier circuit A30 is electrically connected prime
It carries impedance and IGBT array A4, isolating amplifier circuit B22 is electrically connected successive load impedance and IGBT array 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 macro, 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 array 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 on-off check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT array 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 connection prime accompany examination 12, and relay B21 electrical connection rear class accompanies 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), it is negative that isolating amplifier circuit A30 is electrically connected prime
It carries impedance and IGBT array A4, isolating amplifier circuit B22 is electrically connected successive load impedance and IGBT array 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 structure include that sequence is electrically connected to rear class the resistance of examination 17 is accompanied to return
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 B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access are passed through by isolating amplifier circuit B signal output end respectively,
Resistance R5 right end is connect with the left end resistance R6 by IGBT6, and is accessed by isolating amplifier circuit B22 signal output end by B6,
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 passes through B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 access, inductance L5 right end and electricity respectively
The left end L6 is felt by IGBT22 connection, and is accessed by isolating amplifier circuit B22 signal output end by B22.
3rd embodiment
Referring to Fig. 1, Fig. 5, a kind of low-voltage alternating-current switch on and off inspection power factor test macro, 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 array 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 on-off check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT array 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 connection prime accompany examination 12, and relay B21 electrical connection rear class accompanies 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), it is negative that isolating amplifier circuit A30 is electrically connected prime
It carries impedance and IGBT array A4, isolating amplifier circuit B22 is electrically connected successive load impedance and IGBT array 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 structure include that sequence is electrically connected to rear class the resistance of examination 17 is accompanied to return
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 B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access are passed through by isolating amplifier circuit B signal output end respectively,
Resistance R5 right end is connect with the left end resistance R6 by IGBT6, and is accessed by isolating amplifier circuit B22 signal output end by B6,
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 passes through B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 access, inductance L5 right end and electricity respectively
The left end L6 is felt by IGBT22 connection, and is accessed by isolating amplifier circuit B22 signal output end by B22.
Wherein: prime load impedance and IGBT array A4 structural principle and successive load impedance and IGBT array B16 structure
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 macro, 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 array 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 on-off check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT array 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 connection prime accompany examination 12, and relay B21 electrical connection rear class accompanies 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), it is negative that isolating amplifier circuit A30 is electrically connected prime
It carries impedance and IGBT array A4, isolating amplifier circuit B22 is electrically connected successive load impedance and IGBT array 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 structure include that sequence is electrically connected to rear class the resistance of examination 17 is accompanied to return
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 B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access are passed through by isolating amplifier circuit B signal output end respectively,
Resistance R5 right end is connect with the left end resistance R6 by IGBT6, and is accessed by isolating amplifier circuit B22 signal output end by B6,
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 passes through B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 access, inductance L5 right end and electricity respectively
The left end L6 is felt by IGBT22 connection, and is accessed by isolating amplifier circuit B22 signal output end by B22.
Wherein: prime load impedance and IGBT array A4 structural principle and successive load impedance and IGBT array B16 structure
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 structure and corresponding IGBT several 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 macro, 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 array 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 on-off check test circuit of low-voltage alternating-current switch that grade load impedance and IGBT array 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 connection prime accompany examination 12, and relay B21 electrical connection rear class accompanies 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), it is negative that isolating amplifier circuit A30 is electrically connected prime
It carries impedance and IGBT array A4, isolating amplifier circuit B22 is electrically connected successive load impedance and IGBT array 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 structure include that sequence is electrically connected to rear class the resistance of examination 17 is accompanied to return
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 B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access are passed through by isolating amplifier circuit B signal output end respectively,
Resistance R5 right end is connect with the left end resistance R6 by IGBT6, and is accessed by isolating amplifier circuit B22 signal output end by B6,
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 passes through B12, B13, B14, B15, B16, B17, B18, B19, B20, B21 access, inductance L5 right end and electricity respectively
The left end L6 is felt by IGBT22 connection, and is accessed by isolating amplifier circuit B22 signal output end by B22.
Wherein: prime load impedance and IGBT array A4 structural principle and successive load impedance and IGBT array B16 structure
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 structure and corresponding IGBT several changeable,
Inductance number and corresponding IGBT number also changeable.
Wherein: mainly including 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 macro
Test method, including test before first determine low-voltage alternating-current switch 18 wiring it is correct, feature is: pressing 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 test 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 macro
Test method, including test before first determine low-voltage alternating-current switch 18 wiring it is correct, feature is: pressing 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 test 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, seeks power factor with bidirectional pulse counting method, test starts
Low-voltage alternating-current switch 18 is in an off state, and does not have electric current in circuit, and more two neighboring voltage peak reaches in floating voltage
After stable state, M point sends first pulse signal at the time of voltage signal is from negative value to zero point, then in each voltage from negative
Send pulse signal at the time of being worth zero point, until loss of voltage it is previous from negative value to zero point at the time of Q point, 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
At the time of to zero point N send a pulse signal to moment N+1, calculatings pulse signal interval T be the test current period,
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 point
To the time corresponding phase angle of Q pointCosine value be the test loop power factorSpecific formula for calculation is
In formula, t1The time between M point and N point, unit ms；t2
The time between M point and Q point, unit ms；t3The time between P point and N point, unit ms；T is sinusoidal ac period,
Unit is ms；2 π are sinusoidal ac period angle, π=180 °.
Claims (11)
1. a kind of low-voltage alternating-current switch on and off examines power factor test macro, 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 array
A, second switch cabinet, prime accompany examination, examined low-voltage alternating-current switch, rear class to accompany examination, successive load impedance and IGBT array 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 connection prime accompanies examination, and relay B electrical connection rear class accompanies examination,
Relay C, time detection module are electrically connected examined low-voltage alternating-current switch, and be 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 is electrically connected prime load impedance and IGBT
Array A, isolating amplifier circuit B are electrically connected successive load impedance and IGBT array B, DSP pass through current detection module, voltage detecting
Module 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 test macro, it is characterised in that:
Successive load impedance and IGBT array B structure include sequentially being electrically connected to rear class to accompany the resistance loop of examination, inductor loop, and resistance returns
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 passes through B1, B2, B3, B4, B5, B7, B8, B9, B10, B11 access respectively, and resistance R5 right end and the left end resistance R6 are logical
Cross IGBT6 connection, and accessed by isolating amplifier circuit B signal output end by B6, 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 pass through respectively B12, B13, B14,
B15, B16, B17, B18, B19, B20, B21 access, inductance L5 right end are connect with the left end inductance L6 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 test macro, it is characterised in that:
Prime load impedance and IGBT array A structural principle are identical as successive load impedance and IGBT array B structure principle, 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 test macro, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structure and corresponding IGBT several 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 test macro, it is characterised in that:
Prime load impedance and IGBT array A structural principle are identical as successive load impedance and IGBT array B structure principle, 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 test macro, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structure and corresponding IGBT several 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 test macro, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structure and corresponding IGBT several 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 test macro, it is characterised in that:
Resistance number in successive load impedance and IGBT array B structure and corresponding IGBT several changeable, inductance number with it is corresponding
IGBT number also changeable.
9. any low-voltage alternating-current switch on and off described in -8 examines power factor test macro, feature according to claim 1
It is: mainly includes switch of the power supply module, first switch cabinet control button, second switch cabinet control button, touching on control panel
Touch screen.
10. a kind of low-voltage alternating-current switch on and off examines the test method of power factor test macro, including first determines before testing low
It presses the wiring of alternating-current switch correct, is characterized in that: pressing the switch of the power supply module on control panel, be arranged according to experiment type pre-
Phase power factor presses the first switch cabinet control button on control panel, and PLC sends control instruction first switch cabinet and closes a floodgate,
The second switch cabinet control button on control panel is pressed, PLC sends control instruction second switch cabinet and closes a floodgate, point operation control panel
Start button in upper touch screen, it is as follows that software program automatically controls power factor test process, when call through test, closes or when separating brake
Sequence is that prime accompanies examination, rear class to accompany examination, low-voltage alternating-current switch, is opened after the completion of power factor test by second switch cabinet, first
Pass cabinet, power module are sequentially opened, PLC and DSP collecting test system voltage, electric current and time signal in test process, through logical
Module feedback is interrogated to industrial computer, realizes that data show, store, through printer print result.
11. the test side that a kind of low-voltage alternating-current switch on and off according to claim 10 examines power factor test macro
Method, it is characterised in that: software program automatically controls power factor test, seeks power factor with bidirectional pulse counting method, test is opened
Beginning low-voltage alternating-current switch is in an off state, and does not have electric current in circuit, more two neighboring voltage peak reaches in floating voltage
After stable state, M point sends first pulse signal at the time of voltage signal is from negative value to zero point, then in each voltage from negative
Send pulse signal at the time of being worth zero point, until loss of voltage it is previous from negative value to zero point at the time of Q point, 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
At the time of to zero point N send a pulse signal to moment N+1, calculatings pulse signal interval T be the test current period,
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 point
To the time corresponding phase angle of Q pointCosine value be the test loop power factorSpecific formula for calculation is
In formula, t1The time between M point and N point, unit ms；t2For M point
The time between Q point, unit ms；t3The time between P point and N point, unit ms；T is sinusoidal ac period, and unit is
ms；2 π are sinusoidal ac period angle, π=180 °.
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Cited By (1)
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