CN110672987A - Partial discharge signal simulation device with temperature protection and overvoltage protection - Google Patents
Partial discharge signal simulation device with temperature protection and overvoltage protection Download PDFInfo
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- CN110672987A CN110672987A CN201810708278.2A CN201810708278A CN110672987A CN 110672987 A CN110672987 A CN 110672987A CN 201810708278 A CN201810708278 A CN 201810708278A CN 110672987 A CN110672987 A CN 110672987A
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- 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
- G01R31/1227—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 of components, parts or materials
Abstract
The invention discloses a partial discharge signal simulation device with temperature protection and overvoltage protection, which comprises a micro-processing chip, a driving amplification circuit, a constant voltage source, a charging resistor, a discharging resistor, a first relay, a second relay, a first capacitor, a temperature detection module, a temperature feedback module, an overvoltage detection module and a third relay. The technical scheme of the invention has the beneficial effects that: 1. the device is provided with a temperature detection module and a temperature feedback module, and is used for detecting the internal temperature of the device and adjusting according to the internal temperature, so that the product safety of the partial discharge signal simulation device is guaranteed, and the service life of the product is prolonged; 2. because the elements in the temperature detection module belong to low-cost and low-power consumption elements, the temperature detection module can be integrated on a very small circuit board, the size of the existing device is not affected basically, and the cost expenditure is very low; 3. the overvoltage detection function is provided, and the damage of a subsequent circuit caused by the over-high voltage of the partial discharge signal can be effectively prevented.
Description
Technical Field
The invention relates to the field of voltage diagnosis devices, in particular to an partial discharge signal simulation device with temperature protection and overvoltage protection.
Background
The partial discharge test has higher sensitivity. For newly designed and manufactured high-voltage electrical equipment, weak links in insulation can be found in time through partial discharge measurement, errors in design and manufacturing processes and improper use of materials are prevented, the method is an important method for identifying product insulation or equipment operation reliability, and equipment defects which cannot be found in a withstand voltage test can be found. Partial discharge testing is one of the important items of preventive testing of current power equipment.
In the partial discharge test of the GIS equipment, when partial discharge occurs in the GIS equipment, the partial discharge is firstly received by a sensor of the partial discharge tester and then analyzed and processed by the partial discharge tester. Because the existing partial discharge test sensors have a plurality of manufacturers and different products, the sensitivity of many sensors is very low due to the quality problem, and the following problems can be caused:
when a GIS device uses such a sensor to receive a partial discharge signal, when a partial discharge occurs inside the GIS device, the sensor may not be able to detect such a signal.
The GIS partial discharge tester generally tests a high-frequency part in a partial discharge signal, the high-frequency signal is relatively attenuated in the propagation process, and when partial discharge occurs in GIS equipment, the partial discharge signal cannot be detected because the installation position of a sensor is far away.
The partial discharge signal simulation device can simulate ultrahigh frequency partial discharge of high voltage amplitude and is used for detecting whether the GIS partial discharge test sensor can work normally. However, the conventional partial discharge signal simulation apparatus has a large number of high-voltage devices therein and a large capacitance charging loop current, so that a heat generation phenomenon is easily caused. Meanwhile, the internal constant voltage source may generate a spike overvoltage signal, which may damage internal electronic components.
Disclosure of Invention
The invention overcomes the defects of heating and overvoltage of the existing GIS partial discharge tester, and provides a novel partial discharge signal simulation device with temperature protection and overvoltage protection. According to the invention, the temperature control of the interior of the device is realized by utilizing the temperature detection module and the temperature feedback module, so that the problem of heating damage caused by overhigh temperature of the interior of the device is effectively avoided; meanwhile, the overvoltage detection function is achieved, and damage to subsequent circuits caused by over-high partial discharge signal voltage can be effectively prevented.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a partial discharge signal simulator with temperature protection and overvoltage protection comprises a microprocessor chip, a drive amplifier circuit, a constant voltage source, a charging resistor, a discharging resistor, a first relay, a second relay, a first capacitor, a temperature detection module, a temperature feedback module, an overvoltage detection module and a third relay,
the temperature detection module is used for detecting the internal temperature of the partial discharge signal simulation device and transmitting related data to the micro-processing chip;
the temperature feedback module is used for carrying out negative feedback on the device when the temperature detection module detects that the internal temperature of the partial discharge signal simulation device exceeds a threshold value, so as to realize the protection of the partial discharge signal simulation device;
the first output end of the micro-processing chip is electrically connected with the input end of the driving circuit;
the second output end of the micro-processing chip is electrically connected with the control end of the third relay;
the output end of the driving amplification circuit is electrically connected with the control end of the first relay;
the output end of the driving amplification circuit is electrically connected with the control end of the second relay;
the action logic of the first relay is opposite to that of the second relay;
the first relay is in a normally closed state, and the second relay is in a normally open state;
the output end of the constant voltage source is electrically connected with one end of the charging resistor;
the output end of the constant voltage source is electrically connected with the input end of the voltage detection module;
the output end of the voltage detection module is electrically connected with the input end of the micro-processing chip;
the other end of the charging resistor is electrically connected with one end of the switch side of the first relay;
the other end of the switch side of the first relay is electrically connected with one end of the first capacitor;
the other end of the first capacitor is grounded;
the other end of the switch side of the first relay is electrically connected with one end of the switch side of the second relay;
the other end of the switch side of the second relay is electrically connected with one end of the discharge resistor;
one end of the switch side of the third relay is connected with a power supply;
the other end of the switch side of the third relay is electrically connected with the input end of the constant voltage source;
the other end of the discharge resistor is grounded.
The working process of the invention is as follows:
the signal generator is controlled to output square wave signals through the micro-processing chip, the first relay and the second relay are controlled to be switched on and off after power amplification is carried out through the driving amplification circuit, and the first relay and the second relay have opposite working logics, so when the first relay is switched on and the second relay is switched off, the constant voltage source charges the capacitor through the charging resistor; when the first relay is disconnected and the second relay is closed, the charged capacitor is discharged through the discharge resistor, so that a local discharge generation process is simulated, and the sensor is tested. Meanwhile, the temperature detection module is used for detecting the temperature inside the device, and the micro-processing chip is used for analyzing the data of the temperature detection module to obtain the temperature data related to the inside of the device. When the temperature detection module detects that the internal temperature of the partial discharge signal simulation device exceeds a threshold value, the temperature feedback module carries out negative feedback on the device, and the partial discharge signal simulation device is protected. Meanwhile, the output voltage of the constant voltage source is detected through the voltage detection module, and a detection result is sent to the micro-processing chip. When the micro-processing chip detects that the output voltage of the constant voltage source exceeds a threshold value, the third relay is controlled to be switched off, the power supply end of the constant voltage source is cut off, and overvoltage protection is achieved.
In a preferred embodiment, the temperature detecting module includes a thermistor, a first resistor, a second resistor, a third resistor, a second capacitor, and a third capacitor, wherein,
the third output end of the micro-processing chip is electrically connected with one end of the thermistor;
the third output end of the micro-processing chip is electrically connected with one end of the first resistor;
the first input end of the micro-processing chip is electrically connected with the other end of the first resistor;
the other end of the second resistor is electrically connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
the other end of the thermistor is electrically connected with one end of the second resistor;
the other end of the second resistor is electrically connected with a second input end of the micro-processing chip;
the other end of the second resistor is electrically connected with one end of the third capacitor;
the other end of the third capacitor is grounded;
the other end of the thermistor is electrically connected with a fifth output end of the micro-processing chip, and the fifth output end of the micro-processing chip outputs positive voltage;
the other end of the thermistor is electrically connected with one end of a third resistor;
the other end of the third resistor is electrically connected with the fourth output end of the micro-processing chip, and the fourth output end of the micro-processing chip outputs negative voltage.
In the preferred embodiment, the third output terminal of the microprocessor chip outputs a positive voltage, the fourth output terminal of the microprocessor chip outputs a negative voltage, and the third output terminal of the microprocessor chip, the fourth output terminal of the microprocessor chip and the third resistor form a shunt loop, so as to determine the current flowing from the second output terminal of the microprocessor chip into the first input terminal of the microprocessor chip. The first input end of the micro-processing chip and the second input end of the micro-processing chip are respectively electrically connected with two ends of the thermistor, and the micro-processing chip measures the voltage of the thermistor according to the first input end of the micro-processing chip and the second input end of the micro-processing chip, so that the resistance value of the thermistor is obtained, and the temperature inside the device is indirectly obtained.
In a preferred embodiment, the temperature feedback module includes a fourth relay, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a fourth filter capacitor, a first operational amplifier, a current-voltage conversion module, a first PNP triode, a magnetic bead, and a linear regulator, wherein,
a sixth output end of the micro-processing chip is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is electrically connected with one end of the fifth resistor;
a seventh output end of the micro-processing chip is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with one end of the first filter capacitor;
the other end of the first filter capacitor is grounded;
the other end of the sixth resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is electrically connected with one end of the second filter capacitor;
the other end of the second filter capacitor is grounded;
the other end of the seventh resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with one end of the third filter capacitor;
the other end of the third filter capacitor is grounded;
the other end of the eighth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the fourth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the tenth resistor;
the power supply input end of the first operational amplifier is connected with a digital power supply;
the output end of the first operational amplifier is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is electrically connected with the base level of the first PNP triode;
the emitter of the first PNP triode is grounded;
the emitter of the first PNP triode is electrically connected with the other end of the tenth resistor;
the collector of the first PNP triode is electrically connected with the first input end of the current-voltage conversion module;
the other end of the fifth resistor is electrically connected with the second input end of the current-voltage conversion module;
the first input end of the current-voltage conversion module is electrically connected with the input end of the linear regulator;
the output end of the linear regulator is used as a digital power supply, and the output end of the linear regulator is electrically connected with one end of the fourth filter capacitor;
the other end of the fourth filter capacitor is grounded;
the output end of the linear regulator is electrically connected with one end of the magnetic bead;
the other end of the magnetic bead is used as an analog power supply;
the analog power supply port of the micro-processing chip is electrically connected with the other end of the magnetic bead;
the seventh output end of the micro-processing chip is electrically connected with the control end of the fourth relay;
one end of the switch side of the fourth relay is electrically connected with the mobile power supply;
the other end of the switch side of the fourth relay is electrically connected with the analog power supply port of the micro-processing chip.
In the preferred embodiment, the micro-processing chip modulates the pulse width of the signal at the sixth output terminal of the micro-processing chip according to the data of the temperature detection module, so as to adjust the voltage value of the tenth resistor. An output signal of a sixth output end of the micro-processing chip is input to an inverting input end of the first operational amplifier after passing through a third-order RC filter circuit (the third-order RC filter circuit is composed of a sixth resistor, a seventh resistor, an eighth resistor, a first filter capacitor, a second filter capacitor and a third filter capacitor), an output signal of a fifth output end of the micro-processing chip is input to a non-inverting input end of the first operational amplifier to serve as comparison voltage, then the output signal passes through a triode amplifying circuit composed of a first PNP triode, and the triode amplifying circuit inputs a first input end of the current-voltage conversion module. And then the linear regulator is supplied with power through the current-voltage conversion module. Because the analog power supply is powered by the mobile power supply when the microprocessor chip is started, the lithium battery supplies power to the microprocessor chip through a third relay (in a normally closed state). And then the micro-processing chip judges whether the temperature of the thermistor is in a normal range, if so, the linear regulator is controlled by a sixth output end of the micro-processing chip to supply power to the micro-processing chip, meanwhile, the seventh output end of the micro-processing chip supplies power to the fourth relay, the switch side of the fourth relay is disconnected, and the mobile power supply supplies power to the micro-processing chip.
In a preferred embodiment, the voltage detection module includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first operational amplifier and a low-pass filter circuit, wherein,
one end of the eleventh resistor is used as the input end of the voltage detection module, and the other end of the eleventh resistor is electrically connected with one end of the twelfth resistor;
the other end of the twelfth resistor is grounded;
one end of the eleventh resistor is electrically connected with one end of the thirteenth resistor;
the other end of the eleventh resistor is electrically connected with one end of the fourteenth resistor;
the other end of the thirteenth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fourteenth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the thirteenth resistor is electrically connected with one end of the fifteenth resistor;
the other end of the fourteenth resistor is electrically connected with one end of the sixteenth resistor;
the other end of the fifteenth resistor is grounded;
the other end of the sixteenth resistor is electrically connected with the output end of the first operational amplifier;
the output end of the first operational amplifier is electrically connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is used as the output end of the voltage detection module.
In a preferred embodiment, the low-pass filter circuit includes a fourth capacitor, a fifth capacitor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a second operational amplifier, wherein,
one end of the seventeenth resistor is used as the input end of the low-pass filter, and the other end of the seventeenth resistor is electrically connected with one end of the eighteenth resistor;
the other end of the seventeenth resistor is electrically connected with one end of the fourth capacitor;
the other end of the eighteenth resistor is electrically connected with one end of the fifth capacitor;
the other end of the fifth capacitor is grounded;
the other end of the fourth capacitor is electrically connected with the output end of the second operational amplifier;
the other end of the eighteenth resistor is electrically connected with the non-inverting input end of the second operational amplifier;
the inverting input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier;
the output end of the second operational amplifier is electrically connected with one end of the nineteenth resistor;
the other end of the nineteenth resistor is used as the output end of the low-pass filter.
In a preferred scheme, the constant voltage source comprises an in-phase proportional operation circuit, a voltage division circuit, a proportional current source and a triode, wherein,
the output end of the proportional current source is used as the signal output end of the ultrahigh frequency local amplification signal generator,
the output end of the voltage division circuit is electrically connected with the inverting input end of the in-phase proportional operation circuit through a resistor;
the output end of the proportional current source is electrically connected with the in-phase input end of the in-phase proportional operation circuit through a resistor;
the output end of the in-phase proportional operation circuit is electrically connected with the base electrode of the triode through a resistor;
the output end of the proportional current source is electrically connected with the collector electrode of the triode.
In a preferred embodiment, the driving amplifying circuit includes a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a first diode, a second diode, an NPN transistor, and a PNP transistor,
the cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the fifth resistor;
the other end of the twenty-first resistor is electrically connected with the base level of the NPN triode;
the other end of the twenty-first resistor is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with the positive power supply;
the collector of the NPN triode is connected with the positive power supply;
an emitting electrode of the NPN triode is electrically connected with an emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as an output end of the driving amplifying circuit;
the cathode of the first diode is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with a negative power supply;
the collector of the PNP triode is connected with the negative power supply.
In the preferred embodiment, the driving amplifier circuit is used to increase the output power.
In a preferred embodiment, the partial discharge signal simulation apparatus further includes a display module, and an input end of the display module is electrically connected to an eighth output end of the microprocessor chip.
In the preferred embodiment, the display module is used for displaying the temperature information inside the device and the related information of the output voltage of the constant voltage source.
In a preferred embodiment, the partial discharge signal simulation apparatus further includes a data memory, and an input terminal of the data memory is electrically connected to a ninth output terminal of the microprocessor chip.
In the preferred embodiment, the data storage is used for storing the temperature information inside the device and the information related to the output voltage of the constant voltage source.
In a preferred embodiment, the partial discharge signal simulation apparatus further includes a wireless communication module, and an input end of the wireless communication module is electrically connected to a tenth output end of the microprocessor chip.
In the preferred scheme, the wireless communication module is used for transmitting the temperature information in the device to a remote system or a handheld terminal of a worker.
In a preferred embodiment, the first capacitor is a high frequency ceramic chip capacitor.
In a preferred embodiment, the first relay and the second relay are 5V relays.
In this preferred embodiment, the miniature relay is used to pass high current through the relay contacts, which may cause contact damage, so a 5V relay is required.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the ultrahigh frequency partial discharge of the high voltage amplitude is simulated to detect whether the GIS partial discharge test sensor can work normally or not, so that the safety of power equipment is effectively guaranteed;
2. the device is provided with a temperature detection module and a temperature feedback module, and is used for detecting the internal temperature of the device and adjusting according to the internal temperature, so that the product safety of the partial discharge signal simulation device is guaranteed, and the service life of the product is prolonged;
3. because the elements in the temperature detection module belong to low-cost and low-power consumption elements, the temperature detection module can be integrated on a very small circuit board, the size of the existing device is not affected basically, and the cost expenditure is very low;
4. the overvoltage detection function is provided, and the damage of a subsequent circuit caused by the over-high voltage of the partial discharge signal can be effectively prevented.
Drawings
FIG. 1 is a block diagram of an embodiment.
Fig. 2 is a circuit diagram of a constant voltage source according to an embodiment.
FIG. 3 is a circuit diagram of a low pass filter according to an embodiment.
FIG. 4 is an exemplary diagram of a temperature detection module and a temperature feedback module of an embodiment.
Description of reference numerals: 1. an input end; 2. an operational amplifier; 3. and (4) an output end.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, an partial discharge signal simulation apparatus with temperature protection and overvoltage protection comprises an enhanced STM32 chip, a driving amplifier circuit, a constant voltage source, a charging resistor, a discharging resistor, a first 5V relay, a second 5V relay, a third relay, a high-frequency ceramic chip capacitor, a temperature detection module, a temperature feedback module, an LCD display screen, a TF card and a 2G communication module, wherein,
the temperature detection module is used for detecting the internal temperature of the partial discharge signal simulation device and transmitting related data to the enhanced STM32 chip;
the temperature feedback module is used for carrying out negative feedback on the device when the temperature detection module detects that the internal temperature of the partial discharge signal simulation device exceeds a threshold value, so as to realize the protection of the partial discharge signal simulation device;
a first output end of the enhanced STM32 chip is electrically connected with an input end of the driving circuit;
the output end of the driving amplification circuit is electrically connected with the control end of the first 5V relay;
the output end of the driving amplification circuit is electrically connected with the control end of the second 5V relay;
the action logic of the first 5V relay is opposite to that of the second 5V relay;
the first 5V relay is in a normally closed state, and the second relay is in a normally open state;
the output end of the constant voltage source is electrically connected with one end of the charging resistor;
the output end of the constant voltage source is electrically connected with the input end of the voltage detection module;
the output end of the voltage detection module is electrically connected with the first input end of the enhanced STM32 chip;
the other end of the charging resistor is electrically connected with one end of the switch side of the first relay;
the other end of the switch side of the first 5V relay is electrically connected with one end of the high-frequency ceramic chip capacitor;
the other end of the high-frequency ceramic chip capacitor is grounded;
the other end of the switch side of the first 5V relay is electrically connected with one end of the switch side of the second 5V relay;
the other end of the switch side of the second 5V relay is electrically connected with one end of the discharge resistor;
one end of the switch side of the third 5V relay is connected with a power supply;
the other end of the switch side of the third 5V relay is electrically connected with the input end of the constant voltage source;
the other end of the discharge resistor is grounded;
the input end of the LCD display screen is electrically connected with the second output end of the enhanced STM32 chip.
The input end of the TF card is electrically connected with the third output end of the enhanced STM32 chip;
the input end of the 2G communication module is electrically connected with the fourth output end of the enhanced STM32 chip;
a fifth output end of the enhanced STM32 chip is electrically connected with a control end of a third relay;
one end of the switch side of the third relay is connected with a power supply;
the other end of the switch side of the third relay is electrically connected with the input end of the constant voltage source.
Wherein, the temperature detection module comprises a thermistor, a first resistor, a second resistor, a third resistor, a second capacitor and a third capacitor, wherein,
a sixth output end of the enhanced STM32 chip is electrically connected with one end of the thermistor;
a sixth output end of the enhanced STM32 chip is electrically connected with one end of the first resistor;
a second input end of the enhanced STM32 chip is electrically connected with the other end of the first resistor;
the other end of the second resistor is electrically connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
the other end of the thermistor is electrically connected with one end of the second resistor;
the other end of the second resistor is connected with a third input end of the enhanced STM32 chip;
the other end of the second resistor is electrically connected with one end of the third capacitor;
the other end of the third capacitor is grounded;
the other end of the thermistor is electrically connected with an eighth output end of the enhancement type STM32 chip, and the eighth output end of the enhancement type STM32 chip outputs positive voltage;
the other end of the thermistor is electrically connected with one end of a third resistor;
the other end of the third resistor is electrically connected with a seventh output end of the enhancement type STM32 chip, and the seventh output end of the enhancement type STM32 chip outputs negative voltage.
Wherein the temperature feedback module comprises a fourth relay, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a fourth filter capacitor, a first operational amplifier, a current-voltage conversion module, a first PNP triode, a magnetic bead and a linear regulator, wherein,
a ninth output end of the enhanced STM32 chip is electrically connected with one end of a fourth resistor;
the other end of the fourth resistor is electrically connected with one end of the fifth resistor;
a tenth output end of the enhanced STM32 chip is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with one end of the first filter capacitor;
the other end of the first filter capacitor is grounded;
the other end of the sixth resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is electrically connected with one end of the second filter capacitor;
the other end of the second filter capacitor is grounded;
the other end of the seventh resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with one end of the third filter capacitor;
the other end of the third filter capacitor is grounded;
the other end of the eighth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the fourth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the tenth resistor;
the power supply input end of the first operational amplifier is connected with a digital power supply;
the output end of the first operational amplifier is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is electrically connected with the base level of the first PNP triode;
the emitter of the first PNP triode is grounded;
the emitter of the first PNP triode is electrically connected with the other end of the tenth resistor;
the collector of the first PNP triode is electrically connected with the first input end of the current-voltage conversion module;
the other end of the fifth resistor is electrically connected with the second input end of the current-voltage conversion module;
the first input end of the current-voltage conversion module is electrically connected with the input end of the linear regulator;
the output end of the linear regulator is used as a digital power supply, and the output end of the linear regulator is electrically connected with one end of the fourth filter capacitor;
the other end of the fourth filter capacitor is grounded;
the output end of the linear regulator is electrically connected with one end of the magnetic bead;
the other end of the magnetic bead is used as an analog power supply;
the port of the analog power supply of the enhanced STM32 chip is electrically connected with the other end of the magnetic bead;
a tenth output end of the enhanced STM32 chip is electrically connected with a control end of a fourth relay;
one end of the switch side of the fourth relay is electrically connected with the mobile power supply;
the other end of the switch side of the fourth relay is electrically connected with an analog power supply port of the enhancement type STM32 chip.
FIG. 4 is an exemplary diagram of a temperature detection module and a temperature feedback module of an embodiment.
As shown in fig. 2, the constant voltage source includes an in-phase proportional operation circuit, a voltage divider circuit, a proportional current source and a transistor, wherein,
the output end of the proportional current source is used as the signal output end of the ultrahigh frequency local amplification signal generator,
the output end of the voltage division circuit is electrically connected with the inverting input end of the in-phase proportional operation circuit through a resistor;
the output end of the proportional current source is electrically connected with the in-phase input end of the in-phase proportional operation circuit through a resistor;
the output end of the in-phase proportional operation circuit is electrically connected with the base electrode of the triode through a resistor;
the output end of the proportional current source is electrically connected with the collector electrode of the triode.
Wherein, the voltage detection module comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first operational amplifier and a low-pass filter circuit,
one end of the eleventh resistor is used as the input end of the voltage detection module, and the other end of the eleventh resistor is electrically connected with one end of the twelfth resistor;
the other end of the twelfth resistor is grounded;
one end of the eleventh resistor is electrically connected with one end of the thirteenth resistor;
the other end of the eleventh resistor is electrically connected with one end of the fourteenth resistor;
the other end of the thirteenth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fourteenth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the thirteenth resistor is electrically connected with one end of the fifteenth resistor;
the other end of the fourteenth resistor is electrically connected with one end of the sixteenth resistor;
the other end of the fifteenth resistor is grounded;
the other end of the sixteenth resistor is electrically connected with the output end of the first operational amplifier;
the output end of the first operational amplifier is electrically connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is used as the output end of the voltage detection module.
As shown in fig. 3, the low pass filter circuit includes a fourth capacitor, a fifth capacitor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a second operational amplifier, wherein,
one end of the seventeenth resistor is used as the input end 1 of the low-pass filter, and the other end of the seventeenth resistor is electrically connected with one end of the eighteenth resistor;
the other end of the seventeenth resistor is electrically connected with one end of the fourth capacitor;
the other end of the eighteenth resistor is electrically connected with one end of the fifth capacitor;
the other end of the fifth capacitor is grounded;
the other end of the fourth capacitor is electrically connected with the output end of the second operational amplifier 3;
the other end of the eighteenth resistor is electrically connected with the non-inverting input end of the second operational amplifier 3;
the inverting input end of the second operational amplifier 3 is electrically connected with the output end of the second operational amplifier 3;
the output end of the second operational amplifier 3 is electrically connected with one end of the nineteenth resistor;
the other end of the nineteenth resistor serves as an output terminal 2 of the low-pass filter.
Wherein the driving amplifying circuit comprises a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a first diode, a second diode, an NPN triode and a PNP triode,
the cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the fifth resistor;
the other end of the twenty-first resistor is electrically connected with the base level of the NPN triode;
the other end of the twenty-first resistor is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with the positive power supply;
the collector of the NPN triode is connected with the positive power supply;
an emitting electrode of the NPN triode is electrically connected with an emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as an output end of the driving amplifying circuit;
the cathode of the first diode is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with a negative power supply;
the collector of the PNP triode is connected with the negative power supply.
The working process of the embodiment is as follows:
the enhanced STM32 chip outputs square wave signals, and the first 5V relay and the second 5V relay are controlled to be switched on and off after power amplification is carried out through the driving amplification circuit. Because the working logics of the first 5V relay and the second 5V relay are opposite, when the first 5V relay is closed and the second 5V relay is opened, the constant voltage source charges the capacitor through the charging resistor; when the first 5V relay is disconnected and the second 5V relay is closed, the charged capacitor is discharged through the discharge resistor, so that a local discharge generation process is simulated, and the sensor is tested. Meanwhile, the temperature detection module is used for detecting the temperature inside the device, and the enhanced STM32 chip is used for analyzing the data of the temperature detection module to obtain the temperature data about the inside of the device. The LCD display screen is used for displaying the temperature information inside the device, the TF card is used for storing the temperature information inside the device, and the 2G communication module is used for sending the temperature information inside the device to the handheld terminal of a remote worker. Meanwhile, the output voltage of the constant voltage source is detected through the voltage detection module, and the detection result is sent to the enhancement type STM32 chip. When the enhanced STM32 chip detects that the output voltage of the constant voltage source exceeds a threshold value, the third relay is controlled to be switched off, the power supply end of the constant voltage source is cut off, and overvoltage protection is realized. Meanwhile, the output voltage of the constant voltage source is detected through the voltage detection module, and the detection result is sent to the enhancement type STM32 chip. When the enhanced STM32 chip detects that the output voltage of the constant voltage source exceeds a threshold value, the third relay is controlled to be switched off, the power supply end of the constant voltage source is cut off, and overvoltage protection is realized.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An office discharge signal simulation device with temperature protection and overvoltage protection is characterized by comprising a micro-processing chip, a driving amplification circuit, a constant voltage source, a charging resistor, a discharging resistor, a first relay, a second relay, a first capacitor, a temperature detection module, a temperature feedback module, an overvoltage detection module and a third relay, wherein,
the temperature detection module is used for detecting the internal temperature of the partial discharge signal simulation device and transmitting related data to the microprocessor chip;
the temperature feedback module is used for carrying out negative feedback on the device when the temperature detection module detects that the internal temperature of the partial discharge signal simulation device exceeds a threshold value, so as to realize the protection of the partial discharge signal simulation device;
the first output end of the micro-processing chip is electrically connected with the input end of the driving circuit;
the second output end of the micro-processing chip is electrically connected with the control end of the third relay;
the output end of the driving amplification circuit is electrically connected with the control end of the first relay;
the output end of the driving amplification circuit is electrically connected with the control end of the second relay;
the action logic of the first relay is opposite to that of the second relay;
the first relay is in a normally closed state, and the second relay is in a normally open state;
the output end of the constant voltage source is electrically connected with one end of the charging resistor;
the output end of the constant voltage source is electrically connected with the input end of the voltage detection module;
the output end of the voltage detection module is electrically connected with the input end of the micro-processing chip;
the other end of the charging resistor is electrically connected with one end of the switch side of the first relay;
the other end of the switch side of the first relay is electrically connected with one end of the first capacitor;
the other end of the first capacitor is grounded;
the other end of the switch side of the first relay is electrically connected with one end of the switch side of the second relay;
the other end of the switch side of the second relay is electrically connected with one end of the discharge resistor;
one end of the switch side of the third relay is connected with a power supply;
the other end of the switch side of the third relay is electrically connected with the input end of the constant voltage source;
the other end of the discharge resistor is grounded.
2. The device according to claim 1, wherein the temperature detecting module comprises a thermistor, a first resistor, a second resistor, a third resistor, a second capacitor, and a third capacitor, wherein,
the third output end of the micro-processing chip is electrically connected with one end of the thermistor;
the third output end of the micro-processing chip is electrically connected with one end of the first resistor;
the first input end of the micro-processing chip is electrically connected with the other end of the first resistor;
the other end of the second resistor is electrically connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
the other end of the thermistor is electrically connected with one end of the second resistor;
the other end of the second resistor is electrically connected with a second input end of the micro-processing chip;
the other end of the second resistor is electrically connected with one end of the third capacitor;
the other end of the third capacitor is grounded;
the other end of the thermistor is electrically connected with a fifth output end of the micro-processing chip, and the fifth output end of the micro-processing chip outputs positive voltage;
the other end of the thermistor is electrically connected with one end of a third resistor;
the other end of the third resistor is electrically connected with the fourth output end of the micro-processing chip, and the fourth output end of the micro-processing chip outputs negative voltage.
3. The partial discharge signal simulation apparatus according to claim 2, wherein the temperature feedback module comprises a fourth relay, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a fourth filter capacitor, a first operational amplifier, a current-to-voltage conversion module, a first PNP transistor, a magnetic bead, and a linear regulator, wherein,
a sixth output end of the micro-processing chip is electrically connected with one end of a fourth resistor;
the other end of the fourth resistor is electrically connected with one end of the fifth resistor;
a seventh output end of the micro-processing chip is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with one end of the first filter capacitor;
the other end of the first filter capacitor is grounded;
the other end of the sixth resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is electrically connected with one end of the second filter capacitor;
the other end of the second filter capacitor is grounded;
the other end of the seventh resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with one end of the third filter capacitor;
the other end of the third filter capacitor is grounded;
the other end of the eighth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the fourth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the tenth resistor;
the power supply input end of the first operational amplifier is connected with a digital power supply;
the output end of the first operational amplifier is electrically connected with one end of a ninth resistor;
the other end of the ninth resistor is electrically connected with the base level of the first PNP triode;
the emitter of the first PNP triode is grounded;
the emitter of the first PNP triode is electrically connected with the other end of the tenth resistor;
the collector stage of the first PNP triode is electrically connected with the first input end of the current-voltage conversion module;
the other end of the fifth resistor is electrically connected with the second input end of the current-voltage conversion module;
the first input end of the current-voltage conversion module is electrically connected with the input end of the linear regulator;
the output end of the linear regulator is used as a digital power supply, and the output end of the linear regulator is electrically connected with one end of the fourth filter capacitor;
the other end of the fourth filter capacitor is grounded;
the output end of the linear regulator is electrically connected with one end of the magnetic bead;
the other end of the magnetic bead is used as an analog power supply;
the analog power supply port of the micro-processing chip is electrically connected with the other end of the magnetic bead;
the seventh output end of the micro-processing chip is electrically connected with the control end of the fourth relay;
one end of the switch side of the fourth relay is electrically connected with the mobile power supply;
the other end of the switch side of the fourth relay is electrically connected with the analog power supply port of the micro-processing chip.
4. The device according to any one of claims 1 to 3, wherein the voltage detection module comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first operational amplifier and a low-pass filter circuit, wherein,
one end of the eleventh resistor is used as the input end of the voltage detection module, and the other end of the eleventh resistor is electrically connected with one end of the twelfth resistor;
the other end of the twelfth resistor is grounded;
one end of the eleventh resistor is electrically connected with one end of the thirteenth resistor;
the other end of the eleventh resistor is electrically connected with one end of the fourteenth resistor;
the other end of the thirteenth resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the other end of the fourteenth resistor is electrically connected with the inverting input end of the first operational amplifier;
the other end of the thirteenth resistor is electrically connected with one end of the fifteenth resistor;
the other end of the fourteenth resistor is electrically connected with one end of the sixteenth resistor;
the other end of the fifteenth resistor is grounded;
the other end of the sixteenth resistor is electrically connected with the output end of the first operational amplifier;
the output end of the first operational amplifier is electrically connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is used as the output end of the voltage detection module.
5. The device according to claim 4, wherein said low-pass filter circuit comprises a fourth capacitor, a fifth capacitor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a second operational amplifier,
one end of the seventeenth resistor is used as the input end of the low-pass filter, and the other end of the seventeenth resistor is electrically connected with one end of the eighteenth resistor;
the other end of the seventeenth resistor is electrically connected with one end of the fourth capacitor;
the other end of the eighteenth resistor is electrically connected with one end of the fifth capacitor;
the other end of the fifth capacitor is grounded;
the other end of the fourth capacitor is electrically connected with the output end of the second operational amplifier;
the other end of the eighteenth resistor is electrically connected with the non-inverting input end of the second operational amplifier;
the inverting input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier;
the output end of the second operational amplifier is electrically connected with one end of a nineteenth resistor;
and the other end of the nineteenth resistor is used as the output end of the low-pass filter.
6. The device according to claim 1, 2, 3 or 5, wherein said constant voltage source comprises an in-phase proportional operation circuit, a voltage divider circuit, a proportional current source and a transistor, wherein,
the output end of the proportional current source is used as the signal output end of the ultrahigh frequency local amplification signal generator,
the output end of the voltage division circuit is electrically connected with the inverting input end of the in-phase proportional operation circuit through a resistor;
the output end of the proportional current source is electrically connected with the in-phase input end of the in-phase proportional arithmetic circuit through a resistor;
the output end of the in-phase proportional operation circuit is electrically connected with the base electrode of the triode through a resistor;
the output end of the proportional current source is electrically connected with the collector electrode of the triode.
7. The device according to claim 6, wherein the driving amplifying circuit comprises a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a first diode, a second diode, an NPN transistor, and a PNP transistor, wherein,
the cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the fifth resistor;
the other end of the twenty-first resistor is electrically connected with a base level of the NPN triode;
the other end of the twenty-first resistor is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with a positive power supply;
the collector of the NPN triode is connected with a positive power supply;
the emitting electrode of the NPN triode is electrically connected with the emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as the output end of the driving amplifying circuit;
the cathode of the first diode is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the twentieth resistor;
the other end of the twentieth resistor is connected with a negative power supply;
and the collector of the PNP triode is connected with a negative power supply.
8. The partial discharge signal simulation device according to claim 1, 2, 3, 5 or 7, further comprising a display module, wherein an input terminal of the display module is electrically connected to an eighth output terminal of the microprocessor chip.
9. The device according to claim 8, further comprising a data memory, wherein an input terminal of the data memory is electrically connected to a ninth output terminal of the microprocessor chip.
10. The device according to claim 1, 2, 3, 5, 7 or 9, wherein the device further comprises a wireless communication module, and an input terminal of the wireless communication module is electrically connected to a tenth output terminal of the microprocessor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810708278.2A CN110672987A (en) | 2018-07-02 | 2018-07-02 | Partial discharge signal simulation device with temperature protection and overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810708278.2A CN110672987A (en) | 2018-07-02 | 2018-07-02 | Partial discharge signal simulation device with temperature protection and overvoltage protection |
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| Publication Number | Publication Date |
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| CN110672987A true CN110672987A (en) | 2020-01-10 |
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| CN201810708278.2A Pending CN110672987A (en) | 2018-07-02 | 2018-07-02 | Partial discharge signal simulation device with temperature protection and overvoltage protection |
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| Country | Link |
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| CN (1) | CN110672987A (en) |
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2018
- 2018-07-02 CN CN201810708278.2A patent/CN110672987A/en active Pending
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