CN113009307A - Impulse current wave-chopping adjustable time delay device and method based on programmable logic controller - Google Patents
Impulse current wave-chopping adjustable time delay device and method based on programmable logic controller Download PDFInfo
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- CN113009307A CN113009307A CN202110204869.8A CN202110204869A CN113009307A CN 113009307 A CN113009307 A CN 113009307A CN 202110204869 A CN202110204869 A CN 202110204869A CN 113009307 A CN113009307 A CN 113009307A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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Abstract
The invention relates to an impulse current chopping adjustable time delay device based on a programmable logic controller, which comprises an electro-optical conversion module, an amplifying circuit, the programmable logic controller, an electro-optical conversion module and a chopping trigger unit which are connected in sequence; the device adopts an industrially stable and reliable programmable logic controller, and performs perfect photoelectric isolation on a hardware circuit, has a simple structure, does not need to consider the problems of electromagnetic compatibility and electromagnetic coupling, reduces the complexity of the device, and improves the anti-interference capability and reliability of the device; the wave-chopping delay time is continuously adjustable in a certain range, the delay precision is higher, and the wave-chopping delay device can be widely applied to wave-chopping delay devices of various impact current generators. The device and the method overcome the defects of various short boards for adjusting the delay time and poor anti-electromagnetic interference, effectively avoid the faults of false triggering, halt and the like caused by electromagnetic interference generated at the moment of impact ignition and strong electromagnetic pulse coupling, and improve the reliability and the safety of the system.
Description
Technical Field
The invention relates to the technical field of a high-voltage power equipment impulse current tolerance test and a superconducting test, in particular to an impulse current wave-chopping adjustable time delay device and method based on a programmable logic controller.
Background
The impulse current generator is mainly used for simulating high-amplitude impulse current generated by lightning, is used for testing the strong impulse current resistance of electrical equipment and a surge protection device, and can be used for testing the impulse current resistance of a low-voltage arrester, the electrical equipment and other electronic and electrical equipment in an operating state. In the field of superconducting research, the current time generated by a surge current generator is generally required to be in a range from several milliseconds to tens of milliseconds, the current peak value is required to be in a range from thousands of amperes to tens of kiloamperes, the wave-chopping delay time of the surge current is continuously adjustable in the range of current waveforms, and the error is not more than 0.1 millisecond.
At present, the wave-chopping delay device and method of the domestic conventional impact current generator mostly adopt the following modes: the delay time is generally in microsecond level and can only select fixed numerical values. Secondly, the adjustable time delay is realized by using an R-C loop, the value of R is changed by an adjustable potentiometer so as to adjust the time delay, the resistance value of the resistor is easy to change by heating when the resistor is electrified, the time delay can only be tested by adjusting the potentiometer, and the adjustment is difficult and the precision is low. And thirdly, the delay time is regulated by using MCU processors such as a singlechip and the like through a control program, the defects of the former two schemes can be avoided by adopting the mode, but the MCU processors have poor anti-interference capability and difficult electromagnetic compatibility design, and are easy to be subjected to electromagnetic interference particularly in a high-voltage high-current impact environment, so that the processors are failed or even damaged, and the service life and the reliability of equipment are reduced.
Disclosure of Invention
The invention aims to overcome the defects of various short boards for adjusting the current delay time and poor anti-electromagnetic interference performance, and provides an impulse current wave-chopping adjustable delay device and method based on a programmable logic controller.
In order to achieve the purpose, the impulse current chopping adjustable time delay device based on the programmable logic controller comprises an electro-optical conversion module, an amplifying circuit, the programmable logic controller, a photoelectric conversion module and a chopping trigger unit which are connected in sequence;
the electro-optical conversion module is used for detecting an impulse current starting signal and converting the starting signal into a level signal after photoelectric isolation;
the amplifying circuit is connected with the electro-optical conversion module and used for amplifying the level signal;
the programmable logic controller is connected with the amplifying circuit and used for receiving the amplified level signal and outputting a pulse chopping signal according to preset delay time;
the photoelectric conversion module is connected with the programmable logic controller and used for receiving the pulse chopping signal, converting the pulse chopping signal into an optical signal and converting the optical signal into a pulse electric signal to be output;
and the wave chopping triggering unit is connected with the photoelectric conversion module and used for receiving the pulse receiving electric signal and executing wave chopping triggering action.
Furthermore, the amplifying circuit adopts a triode circuit to amplify signals, and level signals are amplified to 22-24V.
Further, the programmable logic controller is Siemens S7-200.
Further, the chopping trigger unit comprises a thyristor drive circuit.
The impulse current chopping adjustable time delay method based on the programmable logic controller is further provided as follows:
setting wave-chopping delay time on an upper computer connected with a programmable logic controller, and converting the delay time into the number of high-speed pulses with a period of t after calculation;
the electro-optical conversion module converts the detected voltage rising edge signal into a logic level signal, and the amplifying circuit amplifies and outputs the received level signal; the amplified level signal is accessed to a programmable logic controller, the programmable logic controller executes first interruption after detecting a rising edge signal, starts a high-speed counter and starts to count the number of pulses, executes second interruption when the number of the high-speed pulses corresponding to the preset delay time is reached, and simultaneously, the programmable logic controller outputs a pulse chopping signal; the photoelectric conversion module converts the received pulse chopping signal into an optical signal, converts the optical signal into a pulse electric signal and outputs the pulse electric signal, and the chopping trigger unit receives the pulse electric signal and executes the chopping trigger action.
Compared with the prior art, the invention has the following advantages:
1. the impulse current chopping adjustable time delay device adopts the stable and reliable programmable logic controller in industry on hardware, and performs perfect photoelectric isolation on a hardware circuit, so that the impulse current chopping adjustable time delay device has a simple structure, does not need to consider the problems of electromagnetic compatibility and electromagnetic coupling, reduces the complexity of the device, and improves the anti-interference capability and reliability of the device;
2. the chopping delay time is continuously adjustable within a certain range (0-20 ms), the delay precision is high (the error is not more than 0.1ms), and the chopping delay device can be widely applied to chopping delay devices of various impact current generators;
3. the device and the method overcome the defects of various short boards for adjusting the delay time and poor anti-electromagnetic interference, effectively avoid the faults of false triggering, halt and the like caused by electromagnetic interference generated at the moment of impact ignition and strong electromagnetic pulse coupling, and improve the reliability and the safety of the system.
Drawings
FIG. 1 is a block diagram of an impulse current chopping adjustable delay device based on a programmable logic controller according to the present invention;
fig. 2 is a schematic flow chart of the impulse current chopping adjustable delay method based on the programmable logic controller.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the impulse current chopping adjustable delay device based on the programmable logic controller includes an electro-optical conversion module 10, an amplifying circuit 20, a programmable logic controller 30, an electro-optical conversion module 40, and a chopping trigger unit 50, which are connected in sequence.
The electro-optical conversion module is used for detecting an impulse current starting signal and converting the starting signal into a level signal after photoelectric isolation; the amplifying circuit is connected with the electro-optical conversion module and used for amplifying the level signal; the programmable logic controller is connected with the amplifying circuit and used for receiving the amplified level signal and outputting a pulse chopping signal according to preset delay time; the photoelectric conversion module is connected with the programmable logic controller and used for receiving the pulse chopping signal, converting the pulse chopping signal into an optical signal and converting the optical signal into a pulse electric signal to be output; and the wave chopping triggering unit is connected with the photoelectric conversion module and used for receiving the pulse receiving electric signal and executing wave chopping triggering action.
In the embodiment, the amplifying circuit adopts a triode circuit to amplify signals, and level signals are amplified to 22-24V; the programmable logic controller is Siemens S7-200; the chopping trigger unit comprises a thyristor drive circuit;
the invention is used for carrying out high-voltage impact current wave interception experiments, wave interception delay time is firstly set on an upper computer interface connected with the programmable logic controller 30, and the delay time is converted into the number of high-speed pulses with the period of t after being calculated.
As shown in fig. 2, the electro-optical conversion module 10 converts the detected voltage rising edge signal into a logic level signal, and the amplifying circuit 20 amplifies and outputs the received level signal; the amplified level signal is accessed to the programmable logic controller 30, the programmable logic controller 30 executes first interruption after detecting the rising edge signal, starts a high-speed counter and starts to count the number of pulses, executes second interruption when the number of the high-speed pulses corresponding to the preset delay time is reached, and simultaneously, the programmable logic controller 30 outputs a pulse chopping signal; the photoelectric conversion module 40 converts the received pulse chopping signal into an optical signal, converts the optical signal into a pulse electrical signal and outputs the pulse electrical signal, and the chopping trigger unit receives the pulse electrical signal and executes a chopping trigger action.
The impulse current chopping adjustable time delay device adopts the stable and reliable programmable logic controller in industry on hardware, and performs perfect photoelectric isolation on a hardware circuit, so that the impulse current chopping adjustable time delay device has a simple structure, does not need to consider the problems of electromagnetic compatibility and electromagnetic coupling, reduces the complexity of the device, and improves the anti-interference capability and reliability of the device; the chopping delay time is continuously adjustable within a certain range (0-20 ms), the delay precision is high (the error is not more than 0.1ms), and the chopping delay device can be widely applied to various impact current generators.
The device and the method overcome the defects of various short boards for adjusting the delay time and poor anti-electromagnetic interference, effectively avoid the faults of false triggering, halt and the like caused by electromagnetic interference generated at the moment of impact ignition and strong electromagnetic pulse coupling, and improve the reliability and the safety of the system.
Claims (5)
1. The utility model provides an adjustable delay unit of impulse current interception based on programmable logic controller which characterized in that: the photoelectric conversion module, the amplifying circuit, the programmable logic controller, the photoelectric conversion module and the chopping trigger unit are sequentially connected;
the electro-optical conversion module is used for detecting an impulse current starting signal and converting the starting signal into a level signal after photoelectric isolation;
the amplifying circuit is connected with the electro-optical conversion module and used for amplifying the level signal;
the programmable logic controller is connected with the amplifying circuit and used for receiving the amplified level signal and outputting a pulse chopping signal according to preset delay time;
the photoelectric conversion module is connected with the programmable logic controller and used for receiving the pulse chopping signal, converting the pulse chopping signal into an optical signal and converting the optical signal into a pulse electric signal to be output;
and the wave chopping triggering unit is connected with the photoelectric conversion module and used for receiving the pulse receiving electric signal and executing wave chopping triggering action.
2. The adjustable time delay device for the impulse current chopping based on the programmable logic controller as claimed in claim 1, wherein: the amplifying circuit adopts a triode circuit to amplify signals, and level signals are amplified to 22-24V.
3. The adjustable time delay device for the impulse current chopping based on the programmable logic controller as claimed in claim 1, wherein: the programmable logic controller is Siemens S7-200.
4. The adjustable time delay device for the impulse current chopping based on the programmable logic controller as claimed in claim 1, wherein: the chopping trigger unit comprises a thyristor drive circuit.
5. The impulse current chopping adjustable time delay method based on the programmable logic controller as claimed in claim 1, wherein: the impulse current wave-chopping adjustable time delay method comprises the following steps:
setting wave-chopping delay time on an upper computer connected with a programmable logic controller, and converting the delay time into the number of high-speed pulses with a period of t after calculation;
the electro-optical conversion module converts the detected voltage rising edge signal into a logic level signal, and the amplifying circuit amplifies and outputs the received level signal; the amplified level signal is accessed to a programmable logic controller, the programmable logic controller executes first interruption after detecting a rising edge signal, starts a high-speed counter and starts to count the number of pulses, executes second interruption when the number of the high-speed pulses corresponding to the preset delay time is reached, and simultaneously, the programmable logic controller outputs a pulse chopping signal; the photoelectric conversion module converts the received pulse chopping signal into an optical signal, converts the optical signal into a pulse electric signal and outputs the pulse electric signal, and the chopping trigger unit receives the pulse electric signal and executes the chopping trigger action.
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| CN202110204869.8A CN113009307A (en) | 2021-02-23 | 2021-02-23 | Impulse current wave-chopping adjustable time delay device and method based on programmable logic controller |
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| CN202110204869.8A CN113009307A (en) | 2021-02-23 | 2021-02-23 | Impulse current wave-chopping adjustable time delay device and method based on programmable logic controller |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419411A (en) * | 2011-09-08 | 2012-04-18 | 国网电力科学研究院 | Combined test device and method of two impulse voltage generators |
| CN102901916A (en) * | 2012-10-16 | 2013-01-30 | 北京华天机电研究所有限公司 | Optical fiber control lightning impulse voltage chopped wave delay trigger device based on FPGA (Field Programmable Gate Array) |
| CN105911463A (en) * | 2016-01-13 | 2016-08-31 | 武汉水院电气有限责任公司 | DC current-limiting breaker high-voltage heavy-current pulse impact test platform |
| CN210958335U (en) * | 2019-12-31 | 2020-07-07 | 苏州迅鹏仪器仪表有限公司 | Impulse voltage wave-cutting trigger pulse delay unit and impulse voltage generator |
| CN211180078U (en) * | 2019-11-27 | 2020-08-04 | 天威保变（秦皇岛）变压器有限公司 | Adjustable time delay device for transformer lightning impulse wave interception test |
-
2021
- 2021-02-23 CN CN202110204869.8A patent/CN113009307A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419411A (en) * | 2011-09-08 | 2012-04-18 | 国网电力科学研究院 | Combined test device and method of two impulse voltage generators |
| CN102901916A (en) * | 2012-10-16 | 2013-01-30 | 北京华天机电研究所有限公司 | Optical fiber control lightning impulse voltage chopped wave delay trigger device based on FPGA (Field Programmable Gate Array) |
| CN105911463A (en) * | 2016-01-13 | 2016-08-31 | 武汉水院电气有限责任公司 | DC current-limiting breaker high-voltage heavy-current pulse impact test platform |
| CN211180078U (en) * | 2019-11-27 | 2020-08-04 | 天威保变（秦皇岛）变压器有限公司 | Adjustable time delay device for transformer lightning impulse wave interception test |
| CN210958335U (en) * | 2019-12-31 | 2020-07-07 | 苏州迅鹏仪器仪表有限公司 | Impulse voltage wave-cutting trigger pulse delay unit and impulse voltage generator |
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