CN112650343A - Intelligent changeable load generator - Google Patents
Intelligent changeable load generator Download PDFInfo
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- CN112650343A CN112650343A CN202011433684.6A CN202011433684A CN112650343A CN 112650343 A CN112650343 A CN 112650343A CN 202011433684 A CN202011433684 A CN 202011433684A CN 112650343 A CN112650343 A CN 112650343A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Automation & Control Theory (AREA)
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Abstract
The invention relates to an intelligent multi-variable load generator which is structurally characterized in that the output end of a system control unit is electrically connected with a stepping motor driving controller, a display unit, a timing unit and an alarm system respectively, the output end of the stepping motor driving controller is electrically connected with the input end of an electric voltage regulator, the output end of the electric voltage regulator is electrically connected with the input end of a current booster, the output end of the current booster is electrically connected with the input ends of a current measuring unit and a temperature measuring unit respectively, and the output ends of the current measuring unit, the temperature measuring unit and the input unit are electrically connected with the system control unit. The invention has the advantages of convenient carrying, simple operation, high efficiency and safety, and is worth of wide popularization and application.
Description
Technical Field
The invention relates to an intelligent variable load generator, and belongs to the field of electric power application.
Background
The current test of current transformers, wires and the like at the present stage mainly adopts a manual test method, the load side of equipment is connected with three slide rheostats, the output current is changed by manually adjusting the resistance under the condition of certain voltage, the test time is controlled by opening and closing of a disconnecting link, the test method needs three persons to cooperate simultaneously for testing, the efficiency is low, the test has certain limitation, and certain potential safety hazards are realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an intelligent variable load generator, which solves the problems that the manual regulation of the resistance in the through-flow test in the prior art is low in efficiency and has potential safety hazards.
The technical scheme of the invention is as follows:
the intelligent multi-variable load generator comprises a shell, wherein a system control unit, a stepping motor driving controller, an electric voltage regulator, a current booster, a current measuring unit, a temperature measuring unit, an input unit, a display unit, a timing unit and an alarm system are arranged in the shell; the output of the system control unit is respectively electrically connected with the stepping motor drive controller, the display unit, the timing unit and the alarm system, the output of the stepping motor drive controller is electrically connected with the input end of the electric voltage regulator, the output end of the electric voltage regulator is electrically connected with the input end of the current rising device, the output end of the current rising device is respectively electrically connected with the input end of the current measuring unit and the temperature measuring unit, and the output ends of the current measuring unit, the temperature measuring unit and the input unit are electrically connected with the system control unit.
The system control unit consists of a singlechip and a peripheral circuit thereof; the system control unit controls the display unit to display menu information; the system control unit receives information of the input unit; the system control unit sets output current and output time information; the system control unit collects conversion values of the current measuring unit and the temperature measuring unit in real time, and measures and displays current values and temperature values; the system control unit controls the stepping motor drive controller to realize the upflow output according to the setting information; the system control unit controls the output time of the timing unit; and the system control unit starts the alarm system to prompt after the over-temperature of the current booster or the output time is finished.
The input unit consists of a key circuit and realizes the man-machine conversation function; the display unit is composed of a 12864 liquid crystal screen, displays set parameters, current, temperature, timing information, starting and stopping, and realizes a man-machine conversation window.
The stepping motor driving controller receives the command of the system control unit and drives the electric voltage regulator to perform an automatic current rising function, and the current rising speed is determined by a pulse signal sent by the system control unit; meanwhile, after the timing time is finished or the overtemperature protection is carried out, the down-flow shutdown can be instantly realized.
The built-in step motor of electronic voltage regulator, realize voltage regulation by step motor drive controller control step motor, electronic voltage regulator is the low pressure side power of current rising ware, output voltage 0~250V is adjustable.
The current booster outputs 0-200A/10V, and the output current is controlled by the input voltage, namely the output current of the current booster is controlled by the output of the electric voltage regulator.
The current measuring unit comprises a current transformer, an A/D conversion circuit and a signal amplification circuit, the current transformer collects current signals of the current booster and outputs the current signals to the A/D conversion circuit, the AD conversion circuit converts the received current signals into digital signals and outputs the digital signals to the signal amplification circuit, and the signal amplification circuit processes the received digital current signals and then calculates actual output current through the system control unit.
The temperature measurement unit comprises a temperature sensor, an A/D conversion circuit and a signal amplification circuit, the temperature sensor collects temperature signals of the current booster and outputs the temperature signals to the AD conversion circuit, the AD conversion circuit converts the received temperature signals into digital signals and then outputs the digital signals to the signal amplification circuit, and the signal amplification circuit processes the received digital temperature signals and then calculates the actually measured temperature through the system control unit.
The timing unit is composed of a time relay, when the output current reaches a set value, the system control unit starts the timing unit to start timing, and when the set time is reached, the timing unit sends a signal to the system control unit to start the alarm system and simultaneously reduce the current and stop the machine.
The alarm system comprises a buzzer, a luminous LED and a driving circuit thereof, and when the set timing time is reached or the temperature exceeds the normal working temperature of the current booster, the control system unit starts the alarm system to emit light
And giving out sound and light alarm and stopping output.
The invention has the following advantages and effects:
different load currents are automatically output according to the setting, and the device has the functions of timing and alarming. The output current value and the through-current time can be set, the system automatically realizes the flow-up process according to the set parameters, and simultaneously displays the current value and the through-current time. The system is intelligently designed, the operation is simple, the measurement is accurate, and the through-flow test of the device is safer and more efficient.
The current transformer, the wire and other through-current tests can be operated by one person; the device is suitable for being used at any time in a working site and a test place; the volume is small, the weight is light, and the electric power resistance is strong; the output current is subjected to stepless adjustment, the current rises stably, the load change range is large, the work is reliable, and the operation is simple; the time consumption of through-flow test work of the current transformer, the wire and the like is shortened, the test work can be completed better and faster, the test can be performed at any time and any place, the normal operation of the equipment such as the current transformer, the wire and the like is ensured, the safety of field work is improved, and meanwhile, the remarkable economic benefit is brought.
Drawings
Fig. 1 is a schematic block diagram of the structural principle of the present invention.
Detailed Description
Examples
The intelligent multi-variable load generator comprises a shell, wherein a system control unit, a stepping motor driving controller, an electric voltage regulator, a current booster, a current measuring unit, a temperature measuring unit, an input unit, a display unit, a timing unit and an alarm system are arranged in the shell; the output of the system control unit is respectively electrically connected with the stepping motor drive controller, the display unit, the timing unit and the alarm system, the output of the stepping motor drive controller is electrically connected with the input end of the electric voltage regulator, the output end of the electric voltage regulator is electrically connected with the input end of the current rising device, the output end of the current rising device is respectively electrically connected with the input end of the current measuring unit and the temperature measuring unit, and the output ends of the current measuring unit, the temperature measuring unit and the input unit are electrically connected with the system control unit.
The system control unit consists of a singlechip and a peripheral circuit thereof; the system control unit controls the display unit to display menu information; the system control unit receives information of the input unit; the system control unit sets output current and output time information; the system control unit collects conversion values of the current measuring unit and the temperature measuring unit in real time, and measures and displays current values and temperature values; the system control unit controls the stepping motor drive controller to realize the upflow output according to the setting information; the system control unit controls the output time of the timing unit; and the system control unit starts the alarm system to prompt after the over-temperature of the current booster or the output time is finished.
The input unit consists of a key circuit and realizes the man-machine conversation function; the display unit is composed of a 12864 liquid crystal screen, displays set parameters, current, temperature, timing information, starting and stopping, and realizes a man-machine conversation window.
The stepping motor driving controller receives the command of the system control unit and drives the electric voltage regulator to perform an automatic current rising function, and the current rising speed is determined by a pulse signal sent by the system control unit; meanwhile, after the timing time is finished or the overtemperature protection is carried out, the down-flow shutdown can be instantly realized.
The built-in step motor of electronic voltage regulator, realize voltage regulation by step motor drive controller control step motor, electronic voltage regulator is the low pressure side power of current rising ware, output voltage 0~250V is adjustable.
The current booster outputs 0-200A/10V, and the output current is controlled by the input voltage, namely the output current of the current booster is controlled by the output of the electric voltage regulator.
The current measuring unit comprises a current transformer, an A/D conversion circuit and a signal amplification circuit, the current transformer collects current signals of the current booster and outputs the current signals to the A/D conversion circuit, the AD conversion circuit converts the received current signals into digital signals and outputs the digital signals to the signal amplification circuit, and the signal amplification circuit processes the received digital current signals and then calculates actual output current through the system control unit.
The temperature measurement unit comprises a temperature sensor, an A/D conversion circuit and a signal amplification circuit, the temperature sensor collects temperature signals of the current booster and outputs the temperature signals to the AD conversion circuit, the AD conversion circuit converts the received temperature signals into digital signals and then outputs the digital signals to the signal amplification circuit, and the signal amplification circuit processes the received digital temperature signals and then calculates the actually measured temperature through the system control unit.
The timing unit is composed of a time relay, when the output current reaches a set value, the system control unit starts the timing unit to start timing, and when the set time is reached, the timing unit sends a signal to the system control unit to start the alarm system and simultaneously reduce the current and stop the machine.
The alarm system comprises a buzzer, a luminous LED and a driving circuit thereof, and when the set timing time is reached or the temperature exceeds the normal working temperature of the current booster, the control system unit starts the alarm system to emit light
And giving out sound and light alarm and stopping output.
The intelligent changeable load generator shell is 400mm long, 300mm wide and 200mm high, and the shell is made by insulating material, and inside adoption step motor drive controller drive electric voltage regulator carries out automatic rising and flows the function, accomplishes or the overtemperature protection back at the timing time simultaneously, can realize falling in the twinkling of an eye and shut down. The current booster can output 0-200A/10V, and the output current is controlled by the input voltage, namely the output current of the current booster is controlled by the output of the electric voltage regulator. The electric voltage regulator regulates the output voltage to be 0-250V adjustable. A stepping motor is arranged in the device, and a driver controls the stepping motor to realize voltage regulation.
The main technical parameters of the invention are as follows:
1. electricity test grade: 10 KV;
2. rated capacity: 2kVA, output: current AC 0-200A, voltage 10V;
3. rated frequency: 50Hz, response time: <5 ms;
4. electrode spacing distance: 128mm;
5. the size of the box body is as follows: 400 x 300 x 200mm, weight: 25kg;
6. and (3) continuous working time: 10 hours;
7. test time: can be set within 0-1000 min;
8. precision: the current is 1%;
9. protection: overcurrent protection and overheat protection;
10. the use conditions are as follows:
a, the ambient temperature is minus 30 ℃ to plus 70 ℃;
b relative temperature RH is less than or equal to 85 percent (25 ℃);
and the altitude h is less than or equal to 1000 m.
Application examples
The invention is applied to the test work of a batch of 96 current transformers to be tested received by a high-voltage test team of a certain company transformer area.
According to the past test experience, three persons are required to cooperate with each other to perform the through-current test work of the current transformer, the load side of the equipment is connected with three slide rheostats, one person adjusts the voltage, the other person manually adjusts the size of the resistor to realize the change of the output current, the other person controls the test time by utilizing the opening and closing of the disconnecting link, and the test of one current transformer usually requires 20 minutes; after the device is applied, the checking work can be completed by only one person, the test can be completed by only 5 minutes once, the work is completed by every person for 1440 minutes, the work is completed by totally saving time, the working efficiency is improved by using the device, the operation and maintenance cost is reduced, the through-flow test work of the current transformer is safer, more efficient and more accurate, and the device is widely commented by a line of workers and is worthy of being widely popularized and applied.
Claims (10)
1. The intelligent multi-variable load generator is characterized by comprising a shell, wherein a system control unit, a stepping motor driving controller, an electric voltage regulator, a current booster, a current measuring unit, a temperature measuring unit, an input unit, a display unit, a timing unit and an alarm system are arranged in the shell; the output of the system control unit is respectively electrically connected with the stepping motor drive controller, the display unit, the timing unit and the alarm system, the output of the stepping motor drive controller is electrically connected with the input end of the electric voltage regulator, the output end of the electric voltage regulator is electrically connected with the input end of the current rising device, the output end of the current rising device is respectively electrically connected with the input end of the current measuring unit and the temperature measuring unit, and the output ends of the current measuring unit, the temperature measuring unit and the input unit are electrically connected with the system control unit.
2. The intelligent changeable load generator of claim 1, wherein the system control unit is comprised of a single-chip microcomputer and its peripheral circuits; the system control unit controls the display unit to display menu information; the system control unit receives information of the input unit; the system control unit sets output current and output time information; the system control unit collects conversion values of the current measuring unit and the temperature measuring unit in real time, and measures and displays current values and temperature values; the system control unit controls the stepping motor drive controller to realize the upflow output according to the setting information; the system control unit controls the output time of the timing unit; and the system control unit starts the alarm system to prompt after the over-temperature of the current booster or the output time is finished.
3. The intelligent changeable load generator of claim 1, wherein the input unit is comprised of a key circuit to implement a man-machine interaction function; the display unit is composed of a 12864 liquid crystal screen, displays set parameters, current, temperature, timing information, starting and stopping, and realizes a man-machine conversation window.
4. The intelligent multivariable load generator according to claim 1, wherein the stepper motor driving controller receives a command from the system control unit and drives the electric voltage regulator to perform an automatic current rise function, and the current rise speed is determined by a pulse signal sent by the system control unit; meanwhile, after the timing time is finished or the overtemperature protection is carried out, the down-flow shutdown can be instantly realized.
5. The intelligent changeable load generator according to claim 1, wherein the electric voltage regulator is internally provided with a stepping motor, the stepping motor is controlled by the stepping motor drive controller to realize voltage regulation, the electric voltage regulator is a low-voltage side power supply of the current booster, and the output voltage is adjustable from 0V to 250V.
6. The intelligent multiple variable load generator according to claim 1, wherein the current booster outputs 0-200A/10V, and the output current is controlled by the input voltage, i.e. the output current of the current booster is controlled by the output of the electric voltage regulator.
7. The intelligent multi-variable load generator according to claim 1, wherein the current measuring unit comprises a current transformer, an a/D conversion circuit and a signal amplification circuit, the current transformer collects a current signal of the current booster and outputs the current signal to the a/D conversion circuit, the AD conversion circuit converts the received current signal into a digital signal and outputs the digital signal to the signal amplification circuit, and the signal amplification circuit processes the received digital current signal and then calculates the actual output current by the system control unit.
8. The intelligent multi-variable load generator according to claim 1, wherein the temperature measuring unit comprises a temperature sensor, an A/D conversion circuit and a signal amplification circuit, the temperature sensor collects a temperature signal of the current booster and outputs the temperature signal to the AD conversion circuit, the AD conversion circuit converts the received temperature signal into a digital signal and outputs the digital signal to the signal amplification circuit, and the system control unit calculates the measured temperature after the signal amplification circuit processes the received digital temperature signal.
9. The intelligent multivariable load generator of claim 1, wherein the timing unit is composed of a time relay, when the output current reaches a set value, the system control unit starts the timing unit to start timing, and when the set time is reached, the timing unit sends a signal to the system control unit to start the alarm system and simultaneously stop down-flow.
10. The intelligent multivariable load generator of claim 1, wherein the alarm system comprises a buzzer, a light-emitting LED and a driving circuit thereof, and when a set timing time or temperature is reached
And after the normal working temperature of the current booster is exceeded, the control system unit starts the alarm system to give out sound and light alarm and stops outputting.
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| CN202011433684.6A CN112650343A (en) | 2020-12-10 | 2020-12-10 | Intelligent changeable load generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011433684.6A CN112650343A (en) | 2020-12-10 | 2020-12-10 | Intelligent changeable load generator |
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| CN112650343A true CN112650343A (en) | 2021-04-13 |
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| CN107544324A (en) * | 2017-08-18 | 2018-01-05 | 河海大学常州校区 | Current transformer demarcation high-current generation device and its control method |
| CN107677979A (en) * | 2017-09-15 | 2018-02-09 | 中国电力科学研究院 | A kind of system and method for testing AC extra high voltage current transformer error |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203445791U (en) * | 2013-09-25 | 2014-02-19 | 国网江西南丰县供电有限责任公司 | Intelligent power frequency heavy current generator |
| CN203535415U (en) * | 2013-10-16 | 2014-04-09 | 厦门理工学院 | High-current generating device control circuit with protection function |
| CN105301548A (en) * | 2015-10-27 | 2016-02-03 | 中国电力科学研究院 | Temperature rise characteristic automatic detection device of low-tension current transformer |
| CN105954700A (en) * | 2016-05-03 | 2016-09-21 | 中国电力科学研究院 | Electronic mutual inductor temperature characteristic test system and test method |
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Application publication date: 20210413 |