CN111812540A - Load cabinet for harmonic wave and scintillation test - Google Patents
Load cabinet for harmonic wave and scintillation test Download PDFInfo
- Publication number
- CN111812540A CN111812540A CN202010706011.7A CN202010706011A CN111812540A CN 111812540 A CN111812540 A CN 111812540A CN 202010706011 A CN202010706011 A CN 202010706011A CN 111812540 A CN111812540 A CN 111812540A
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- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 230000010363 phase shift Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- G01R31/40—Testing power supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
Abstract
The invention discloses a load cabinet for harmonic wave and flicker tests.A phase output end of a three-phase voltage input end is connected with an alternating-current phase-shifting voltage regulating module and an air circuit breaker; the air circuit breaker is correspondingly connected with one contact of the output end of the solid-state relay, the other contact of the output end of the solid-state relay is connected with the wiring end of the corresponding test terminal, a flicker control air switch is arranged between the output end of the solid-state relay and the test terminal, the alternating current phase-shifting voltage regulating module is connected with the wiring end of the corresponding test terminal, and harmonic switches are arranged between the alternating current phase-shifting voltage regulating module and the wiring end of the test terminal; the alternating current phase-shifting voltage regulating module is provided with a potentiometer for outputting harmonic components; a harmonic control contactor is further arranged between the three-phase voltage input end and the alternating-current phase-shifting voltage regulating module, two ends of a contact switch of the harmonic control contactor are respectively connected with the three-phase voltage input end and the alternating-current phase-shifting voltage regulating module, and the PLC is respectively connected with the input end of the solid-state relay and the coil power-on input end of the harmonic control contactor.
Description
Technical Field
The invention is used in the technical field of electromagnetic compatibility, and particularly relates to a load cabinet for harmonic wave and flicker tests.
Background
The traditional load cabinet is mainly used for simulating an actual use environment and detecting the load capacity and the load characteristic of the power supply equipment, the voltage characteristic, the frequency characteristic, the current characteristic, the temperature rise and other data of the power supply equipment can be detected through the load cabinet, and whether the power supply equipment is qualified or not can be judged according to a test result, or the improvement is further carried out. The traditional load cabinet has the working principle that loads are put into or cut off timely according to the test requirements of user power supply equipment, corresponding electrical parameters are recorded automatically, corresponding data results are calculated according to corresponding national or industrial standards, data report curves are printed automatically, and the load test requirements are met. The method has the defects that two test items of harmonic waves and flicker output by tested equipment cannot be simulated for testing, so that the testing stability is poor, the tested harmonic waves are easily influenced by the temperature of the tested equipment, and the linear output cannot be achieved after the tested equipment works for a long time under high power.
Disclosure of Invention
The invention aims to provide a load cabinet for harmonic wave and flicker tests, which has stable harmonic wave and flicker output.
The load cabinet for the harmonic wave and flicker test comprises three-phase voltage input ends, wherein each phase output end of the three-phase voltage input ends is connected with an alternating current phase-shifting voltage regulating module and an air circuit breaker;
the air circuit breaker connected with the output end of each phase is correspondingly connected with a contact of the output end of the solid-state relay of the corresponding phase, the other contact of the output end of the solid-state relay of each phase is correspondingly connected with a wiring end corresponding to the test terminal, a flicker control air switch is arranged between the output end of the solid-state relay of each phase and the test terminal, and the input end of the solid-state relay of each phase is connected with the PLC;
the alternating current phase-shifting voltage regulating module connected with the output end of each phase is correspondingly connected with the wiring end corresponding to the test terminal, and a harmonic switch is arranged between the alternating current phase-shifting voltage regulating module and the wiring end corresponding to the test terminal;
the alternating current phase-shifting voltage regulating module is provided with a potentiometer which controls the conversion of input standard sine wave alternating voltage into output harmonic component with distorted sine wave;
still be equipped with harmonic control contactor between three-phase voltage input and the interchange phase shift voltage regulation module, this harmonic control contactor's contact switch's one end with three-phase voltage input connects, this harmonic control contactor's contact switch's the other end respectively with interchange phase shift voltage regulation module connects, and this harmonic control contactor's coil power-on input end and PLC controller are connected.
When a single-phase flicker linear load test is required, a corresponding air circuit breaker of A, B, C three-phase voltage is switched on, a solid-state relay of one phase is switched on through a PLC (programmable logic controller), the solid-state relay is switched on to a flicker control air switch, and the function of the single-phase flicker linear test is realized after the flicker control air switch is switched on; when a three-phase flicker linear load test is required, each air circuit breaker corresponding to A, B, C three-phase voltage is switched on simultaneously, all the solid-state relays are switched on through the PLC, the solid-state relays are switched on to the flicker control air switch, and the function of the three-phase flicker linear load test is realized after the flicker control air switch is closed. Through the setting of single phase and three phases of the flickering state, the flickering display is visual and clear. The PLC is used for controlling the closing of a contact switch of the harmonic control contactor, A, B, C three-phase voltage at a three-phase voltage input end respectively passes through an alternating-current phase-shifting voltage regulating module corresponding to each phase output end, when a single-phase harmonic load test is required, a corresponding harmonic switch of A, B, C three-phase voltage is switched on, a potentiometer is used for controlling the size of a conduction angle through the alternating-current phase-shifting voltage regulating module, standard sine wave alternating current at an input side is converted into sine waves with distortion, harmonic components appear at an output side and are transmitted to a terminal corresponding to a test terminal, and therefore the single-phase harmonic load test is achieved; when a three-phase harmonic load test is required, each harmonic switch corresponding to A, B, C three-phase voltage is switched on, the potentiometer controls the size of a conduction angle through the alternating-current phase-shifting voltage regulating module, standard sine wave alternating current on the input side is converted into sine waves with distortion, harmonic components appear on the output side and are transmitted to a terminal corresponding to a test terminal, so that the three-phase harmonic load test is realized, the potentiometer controls the conduction angle of the alternating-current phase-shifting voltage regulating module to form stable control of the opening degree of a single-phase or three-phase load, stable harmonic output is generated, the voltage waveform output side can be guaranteed to be consistent with the input end according to a linear relation (under the condition that the harmonic function is not started), the voltage waveform output side is not influenced by the change of working time and temperature coefficient, and the stability is good.
Drawings
FIG. 1 is an electrical schematic of the flicker test of the present invention;
FIG. 2 is an electrical schematic of the harmonic generation test of the present invention;
FIG. 3 is an electrical schematic diagram of a PLC controller control circuit in the harmonic test of the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, the load cabinet for harmonic wave and flicker tests comprises three-phase voltage input ends, wherein each phase output end of the three-phase voltage input ends is connected with an alternating-current phase-shifting voltage regulating module and an air circuit breaker;
the air circuit breaker connected with the output end of each phase is correspondingly connected with a contact of the output end of the solid-state relay of the corresponding phase, the other contact of the output end of the solid-state relay of each phase is correspondingly connected with a wiring end corresponding to the test terminal, a flicker control air switch is arranged between the output end of the solid-state relay of each phase and the test terminal, and the input end of the solid-state relay of each phase is connected with the PLC;
the alternating current phase-shifting voltage regulating module connected with the output end of each phase is correspondingly connected with the wiring end corresponding to the test terminal, and a harmonic switch is arranged between the alternating current phase-shifting voltage regulating module and the wiring end corresponding to the test terminal;
the alternating current phase-shifting voltage regulating module is provided with a potentiometer which controls the conversion of input standard sine wave alternating voltage into output harmonic component with distorted sine wave;
still be equipped with harmonic control contactor J2 between three-phase voltage input end and the interchange phase shift voltage regulation module, this harmonic control contactor J2's contact switch's one end with three-phase voltage input end connects, this harmonic control contactor J2's contact switch's the other end respectively with interchange phase shift voltage regulation module connects, and this harmonic control contactor J2's coil is electrified input and is connected with the PLC controller.
When the single-phase flicker linear load test is required, a corresponding air circuit breaker of A, B, C three-phase voltages is switched on, a solid-state relay of one phase is switched on through a PLC (programmable logic controller), the solid-state relay is switched on to a flicker control air switch, and the function of the single-phase flicker linear test is realized after the flicker control air switch is switched on; when a three-phase flicker linear load test is required, each air circuit breaker corresponding to A, B, C three-phase voltage is switched on simultaneously, all the solid-state relays are switched on through the PLC, the solid-state relays are switched on to the flicker control air switch, and the function of the three-phase flicker linear load test is realized after the flicker control air switch is closed. Through the setting of single phase and three phases of the flickering state, the flickering display is visual and clear. The PLC is used for controlling the closing of a contact switch of the harmonic control contactor, A, B, C three-phase voltage at a three-phase voltage input end respectively passes through an alternating-current phase-shifting voltage regulating module corresponding to each phase output end, when a single-phase harmonic load test is required, a corresponding harmonic switch of A, B, C three-phase voltage is switched on, a potentiometer is used for controlling the size of a conduction angle through the alternating-current phase-shifting voltage regulating module, standard sine wave alternating current at an input side is converted into sine waves with distortion, harmonic components appear at an output side and are transmitted to a terminal corresponding to a test terminal, and therefore the single-phase harmonic load test is achieved; when a three-phase harmonic load test is required, each harmonic switch corresponding to A, B, C three-phase voltage is switched on, the potentiometer controls the size of a conduction angle through the alternating-current phase-shifting voltage regulating module, standard sine wave alternating current on the input side is converted into sine waves with distortion, harmonic components appear on the output side and are transmitted to a terminal corresponding to a test terminal, so that the three-phase harmonic load test is realized, the potentiometer controls the conduction angle of the alternating-current phase-shifting voltage regulating module to form stable control of the opening degree of a single-phase or three-phase load, stable harmonic output is generated, the voltage waveform output side can be guaranteed to be consistent with the input end according to a linear relation (under the condition that the harmonic function is not started), the voltage waveform output side is not influenced by the change of working time and temperature coefficient, and the stability is good.
A first current limiting resistor R1 is connected in series between the harmonic switch and the test terminal, the first current limiting resistor R1 is also connected in parallel with a harmonic intensity control contactor J3 and a second current limiting resistor R2, a contact switch of the harmonic control contactor J2 and a three-phase voltage input end are provided with a third current limiting resistor R3 and a fourth current limiting resistor R4, the third current limiting resistor R3 and the fourth current limiting resistor R4 are connected in series, meanwhile, an air circuit breaker and the three-phase voltage input end are provided with a fifth current limiting resistor R5 and a sixth current limiting resistor R6, a seventh current limiting resistor R7 is arranged between the air circuit breaker and the solid state relay, the resistance values of the first current limiting resistor R1, the second current limiting resistor R2, the third current limiting resistor R3, the fourth current limiting resistor R4, the fifth current limiting resistor R5, the sixth current limiting resistor R6 and the seventh current limiting resistor R7 are 2000 ohms, a high-power resistor is adopted, so that the high-power-resistance is, the stability is better.
The first current-limiting resistor R1 is also connected in parallel with a harmonic intensity control contactor J3 and a second current-limiting resistor R2, one end of a contact switch of the harmonic intensity control contactor J3 is connected with the harmonic switch and one end of the first current-limiting resistor R1, the other end of the contact switch is connected with one end of the second current-limiting resistor R2, and the power-on input end of a coil of the harmonic intensity control contactor J3 is connected with the PLC; the other end of the second current limiting resistor R2 is connected with the test terminal and the other end of the first current limiting resistor R1. After the harmonic intensity control contactor J3 is closed, the second current-limiting resistor R2 and the first current-limiting resistor R1 are connected in parallel for output of harmonic signals of the test terminal is stronger, and the later-stage test is facilitated.
A flicker control contactor J1 is further arranged between the three-phase voltage input end and the air circuit breaker, one end of a contact switch of the flicker control contactor J1 is connected with the three-phase voltage input end, the other end of the contact switch of the flicker control contactor J1 is respectively connected with the air circuit breaker, and the power-on input end of a coil of the flicker control contactor J1 is connected with the PLC; a flicker solid-state relay is arranged between the coil power-on input end of the flicker control contactor J1 and the PLC, the input end of the flicker solid-state relay is connected with the output end of the PLC, and the output end of the flicker solid-state relay is connected with the coil power-on input end of the flicker control contactor J1; harmonic solid-state relays are arranged between the coil power-on input end of the harmonic control contactor J2, the coil power-on input end of the harmonic intensity control contactor J3 and the PLC, the input ends of the harmonic solid-state relays are connected with the output end of the PLC, and the output ends of the harmonic solid-state relays are connected with the coil power-on input end of the harmonic control contactor J2 and the coil power-on input end of the harmonic intensity control contactor J3. Adopt PLC controller control, scintillation control contactor J1, harmonic control contactor J2, harmonic intensity control contactor J3, scintillation solid state relay, harmonic solid state relay, exchange and shift the pressure regulating module with shifting, it does not have mechanical contact, consequently does not have the problem of contact wearing and tearing for life is longer, realizes that the speed of control function switching is faster.
The PLC is also connected with the touch display screen through a communication line, so that the numerical value setting of time and test times, the setting of harmonic waves or flicker states and the display of test states are realized. The parameters are set conveniently and quickly, and the state display is visual and clear.
As shown in FIG. 1, the resistance of the potentiometer is in the range of 2-10k Ω, and 5000 ohms is selected in this embodiment. The potentiometer is manually controlled, the middle end of the potentiometer is connected with the cont end of the alternating-current phase-shifting voltage regulating module, and the other two ends of the potentiometer are respectively connected with the com end and the +5V end of the alternating-current phase-shifting voltage regulating module. The +5V voltage is generated in the alternating-current phase-shifting voltage regulating module, external supply is not needed, the voltage is only matched with a manual control potentiometer and is not used for other purposes, when the control end cont changes from 0-5Vdc, the voltage on the alternating-current load can be linearly adjusted from 0V to the maximum value, and the higher the voltage of the cont terminal is, the larger the output of the alternating-current phase-shifting voltage regulating module is. Therefore, the voltage waveform output end is kept consistent with the input end according to the linear relation, the influence of the working time and the temperature coefficient change is avoided, and the stability is good.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A load cabinet for harmonic wave and scintillation test, its characterized in that: the device comprises three-phase voltage input ends, wherein each phase output end of the three-phase voltage input ends is connected with an alternating current phase-shifting voltage regulating module and an air circuit breaker;
the air circuit breaker connected with the output end of each phase is correspondingly connected with a contact of the output end of the solid-state relay of the corresponding phase, the other contact of the output end of the solid-state relay of each phase is correspondingly connected with a wiring end corresponding to the test terminal, a flicker control air switch is arranged between the output end of the solid-state relay of each phase and the test terminal, and the input end of the solid-state relay of each phase is connected with the PLC;
the alternating current phase-shifting voltage regulating module connected with the output end of each phase is correspondingly connected with the wiring end corresponding to the test terminal, and a harmonic switch is arranged between the alternating current phase-shifting voltage regulating module and the wiring end corresponding to the test terminal;
the alternating current phase-shifting voltage regulating module is provided with a potentiometer which controls the conversion of input standard sine wave alternating voltage into output harmonic component with distorted sine wave;
still be equipped with harmonic control contactor (J2) between three-phase voltage input end and the interchange phase shift voltage regulation module, the one end of the contact switch of this harmonic control contactor (J2) with three-phase voltage input end connects, the other end of the contact switch of this harmonic control contactor (J2) respectively with interchange phase shift voltage regulation module connects, and the electricity input end is connected with the PLC controller on the coil of this harmonic control contactor (J2).
2. The load cabinet for harmonic and flicker testing of claim 1, wherein: still be equipped with scintillation control contactor (J1) between three-phase voltage input end and the air circuit breaker, the one end of the contact switch of this scintillation control contactor (J1) with three-phase voltage input end connects, the other end of the contact switch of this scintillation control contactor (J1) respectively with the air circuit breaker connects, and the electricity input and the PLC controller are connected on the coil of this scintillation control contactor (J1).
3. The load cabinet for harmonic and flicker testing of claim 2, wherein: and a flicker solid-state relay is arranged between the coil power-on input end of the flicker control contactor (J1) and the PLC, the input end of the flicker solid-state relay is connected with the output end of the PLC, and the output end of the flicker solid-state relay is connected with the coil power-on input end of the flicker control contactor (J1).
4. The load cabinet for harmonic and flicker testing of claim 1, wherein: a first current limiting resistor (R1) is connected in series between the harmonic switch and the test terminal.
5. The load cabinet for harmonic and flicker testing of claim 4, wherein: the first current-limiting resistor (R1) is also connected with a harmonic intensity control contactor (J3) and a second current-limiting resistor (R2) in parallel, one end of a contact switch of the harmonic intensity control contactor (J3) is connected with the harmonic switch and one end of the first current-limiting resistor (R1), the other end of the contact switch is connected with one end of a second current-limiting resistor (R2), and the coil power-on input end of the harmonic intensity control contactor (J3) is connected with the PLC;
the other end of the second current limiting resistor (R2) is connected with the test terminal and the other end of the first current limiting resistor (R1).
6. The load cabinet for harmonic and flicker testing of claim 5, wherein: the contact switch and the three-phase voltage input end of the harmonic control contactor (J2) are provided with a third current limiting resistor (R3) and a fourth current limiting resistor (R4), and the third current limiting resistor (R3) and the fourth current limiting resistor (R4) are connected in series.
7. The load cabinet for harmonic and flicker testing of claim 6, wherein: the resistance values of the first current limiting resistor (R1), the second current limiting resistor (R2), the third current limiting resistor (R3) and the fourth current limiting resistor (R4) are 2000 ohms.
8. The load cabinet for harmonic and flicker testing of claim 1, wherein: harmonic solid-state relays are arranged among coil electrifying input ends of the harmonic control contactors (J2), coil electrifying input ends of the harmonic intensity control contactors (J3) and the PLC, input ends of the harmonic solid-state relays are connected with output ends of the PLC, and output ends of the harmonic solid-state relays are connected with coil electrifying input ends of the harmonic control contactors (J2) and coil electrifying input ends of the harmonic intensity control contactors (J3).
9. The load cabinet for harmonic and flicker testing of claim 1, wherein: the PLC is also connected with the touch display screen through a communication line.
10. The load cabinet for harmonic and flicker testing of claim 1, wherein: the resistance interval of the potentiometer is 2-10k omega.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706011.7A CN111812540A (en) | 2020-07-21 | 2020-07-21 | Load cabinet for harmonic wave and scintillation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706011.7A CN111812540A (en) | 2020-07-21 | 2020-07-21 | Load cabinet for harmonic wave and scintillation test |
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| CN111812540A true CN111812540A (en) | 2020-10-23 |
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| CN202010706011.7A Pending CN111812540A (en) | 2020-07-21 | 2020-07-21 | Load cabinet for harmonic wave and scintillation test |
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Application publication date: 20201023 |