CN217739325U

CN217739325U - Residual discharge charge alarm indicator for electrical test

Info

Publication number: CN217739325U
Application number: CN202221800942.4U
Authority: CN
Inventors: 杜泓江; 杨易林; 钟德才; 詹翼谋; 于倩倩; 蔡伟; 夏乙文; 袁伟; 王勇; 李中郁; 陈华意
Original assignee: State Grid Corp of China SGCC; Tongliang Power Supply Co of State Grid Chongqing Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Tongliang Power Supply Co of State Grid Chongqing Electric Power Co Ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-11-04
Anticipated expiration: 2032-07-13

Abstract

The utility model discloses an electrical test residual discharge charge alarm indicator, which comprises a sampling circuit, a voltage comparison alarm circuit and a power circuit which are connected in sequence; the sampling circuit is respectively connected with the discharge end and the grounding end of the discharge rod to form partial voltage and is used for collecting a discharge voltage signal of the discharge rod; the voltage comparison alarm circuit is connected between the sampling circuit and the power supply circuit, and is used for comparing the discharge voltage acquired by the sampling circuit with a set value and giving an alarm when the discharge voltage is greater than the set value; the power supply control module is mainly used for adjusting the voltage of the power supply module to enable the power supply module to provide stable working voltage, and has the functions of voltage adjustment and voltage stabilization. The alarm indicator can realize the function of monitoring and alarming overvoltage, so that the discharging operation process is safer, and the risk of personal electric shock is reduced.

Description

Residual discharge charge alarm indicator for electrical test

Technical Field

The utility model relates to an electrical test residual charge alarm indicator that discharges.

Background

The high-voltage test of electrical equipment (electrical equipment: a general term for equipment such as a generator, a transformer, a power line, and a circuit breaker in a power system) is a very common work of an electrical test class, and after the high-voltage test of equipment to be tested (equipment to be tested: the tested electrical equipment), residual charge remains on the equipment to be tested, and particularly, a large amount of residual charge remains on capacitive equipment after the high-voltage test. Therefore, after the high-voltage test, the device under test needs to be fully discharged by using the discharging rod, and then the subsequent test work can be carried out. However, after discharging, whether the tested equipment still has residual charges cannot be judged by naked eyes, the existing discharging rod is not provided with a corresponding detection module and a corresponding detection prompt, if the discharging rod is not fully discharged, the tested equipment and the testing equipment are both adversely affected, the equipment may be damaged, and even the risk of endangering personal safety exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electrical test residual charge alarm indicator that discharges to solve present around high-voltage testing, can't judge whether the equipment under test has the problem of residual charge.

In order to solve the technical problem, the utility model provides an electrical test residual discharge charge alarm indicator, which comprises a sampling circuit, a voltage comparison alarm circuit and a power circuit which are connected in sequence; the sampling circuit is respectively connected with the discharge end and the grounding end of the discharge rod to form voltage division; the voltage comparison alarm circuit is connected between the sampling circuit and the power supply circuit and used for comparing the discharge voltage acquired by the sampling circuit with a set value and giving an alarm when the discharge voltage is greater than the set value.

Further, the sampling circuit comprises a ninth resistor R9, a power sampling management chip U4, a first transistor Q1, a first capacitor C5, a diode ZD1 and a second transistor Q2; the ninth resistor R9 is connected with a discharge rod of a test instrument in series, the OD end of the power supply sampling management chip U4 is connected with the ninth resistor R9, the CS end of the power supply sampling management chip U4 is connected with the pin 1 of the first transistor Q1, the CS end of the power supply sampling management chip U4 is connected with the pin 3 of the first transistor Q1, the TD end of the power supply sampling management chip U4 is connected with the pin 4 of the first transistor Q1, the VCC end of the power supply sampling management chip U4 is respectively connected with one end of the fifth capacitor C5 and the power supply, the GND end of the power supply sampling management chip U4 and the other end of the fifth capacitor C5 are both grounded, the cathode of the diode ZD1 is connected with the pin 2 of the first transistor Q1, the anode of the diode ZD1 is grounded, and the first capacitor C1 is connected with the two ends of the diode ZD1 in parallel; the base electrode of the second transistor Q2 is connected with the output end of the sampling circuit, the emitter electrode of the second transistor Q2 is grounded, and the collector electrode of the second transistor Q2 is connected with the voltage comparison alarm circuit.

Furthermore, a tenth resistor R10 is connected in parallel to both ends of the ninth resistor R9.

Further, the OD end of the power sampling management chip U4 is connected to the ninth resistor R9 through the eighth resistor R8 and the fuse F1 connected in series in sequence.

Further, the voltage comparison alarm circuit comprises a third transistor Q3, a fourth transistor Q4, a first comparator U1, a second comparator U3 and a buzzer; the IN1+ end of the second comparator U3 is connected with the sampling circuit; the IN 1-end of the second comparator U3 is connected with a reference voltage, the OUT1 end of the second comparator U3 is connected with the collector of the third transistor Q3, the OUT2 end of the second comparator U3 is connected with the base of the third transistor Q3, and the emitter of the third transistor Q3 is connected with the input end of the buzzer; the IN 2-end of the second comparator U3 is connected with the base electrode of the fourth transistor Q4, the IN2+ end of the second comparator U3 is connected with the IN1+ end of the first comparator U1, the IN 1-end of the first comparator U1 is connected with the emitting electrode of the fourth transistor Q4, the OUT1 end of the first comparator U1 is connected with the collecting electrode of the fourth transistor Q4, and an indicator light LED1 and a second capacitor C2 which are sequentially connected IN series are connected between the collecting electrode of the fourth transistor Q4 and the VCC end of the first comparator U1.

Furthermore, the voltage comparison alarm circuit also comprises a voltage division protection circuit, wherein the voltage division protection circuit comprises a sixth resistor R6 and a seventh resistor R7 which are sequentially connected with a 5V voltage source; the IN 1-end of the second comparator U3 is connected with the connection joint between the sixth resistor R6 and the seventh resistor R7.

Further, the power supply circuit includes a power conversion chip U2 for converting a 9v power supply into a 5v power supply.

Further, power supply circuit still includes battery protection unit, battery protection unit includes lithium electricity protection chip U5, 1 foot and the voltage comparison warning circuit of lithium electricity protection chip U5 are connected, 2 foot ground connections of lithium electricity protection chip U5, and 3 feet and the 5V input power supply of lithium electricity protection chip U5 are connected, and 4 feet and the 5 feet of lithium electricity protection chip U5 pass through switch circuit ground connection.

The beneficial effects of the utility model are that: when the discharge voltage monitoring circuit works, firstly, a discharge voltage signal is transmitted into the sampling circuit from the main body part of the discharge rod and then is sent into the voltage comparison alarm circuit for comparison, when the discharge voltage signal exceeds a set threshold value, the voltage comparison alarm circuit sends an alarm voltage signal to alarm, the overvoltage monitoring and alarm function is realized, the discharge operation process is safer, and the risk of personal electric shock is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The residual charge discharge alarm indicator for the electrical test shown in fig. 1 comprises a sampling circuit, a voltage comparison alarm circuit and a power supply circuit which are sequentially connected; the sampling circuit is respectively connected with the discharge end and the grounding end of the discharge rod to form partial voltage and is used for collecting a discharge voltage signal of the discharge rod; the voltage comparison alarm circuit is connected between the sampling circuit and the power supply circuit and used for comparing the discharge voltage acquired by the sampling circuit with a set value and giving an alarm when the discharge voltage is greater than the set value; the power supply control module is mainly used for adjusting the voltage of the power supply module to enable the power supply module to provide stable working voltage, and has the functions of voltage adjustment and voltage stabilization.

When the discharge voltage monitoring circuit works, firstly, a discharge voltage signal is transmitted into the sampling circuit from the main body part of the discharge rod and then is sent into the voltage comparison alarm circuit for comparison, when the discharge voltage signal exceeds a set threshold value, the voltage comparison alarm circuit sends an alarm voltage signal to alarm, the overvoltage monitoring and alarm function is realized, the discharge operation process is safer, and the risk of personal electric shock is reduced.

According to an embodiment of the present application, the sampling circuit includes a ninth resistor R9, a power sampling management chip U4, a first transistor Q1, a first capacitor C5, a diode ZD1, and a second transistor Q2; the ninth resistor R9 is connected with a discharge rod of a test instrument in series, the OD end of the power source sampling management chip U4 is connected with the ninth resistor R9, the CS end of the power source sampling management chip U4 is connected with the pin 1 of the first transistor Q1, the CS end of the power source sampling management chip U4 is connected with the pin 3 of the first transistor Q1, the TD end of the power source sampling management chip U4 is connected with the pin 4 of the first transistor Q1, the VCC end of the power source sampling management chip U4 is respectively connected with one end of the fifth capacitor C5 and the power supply, the GND end of the power source sampling management chip U4 and the other end of the fifth capacitor C5 are grounded, the cathode of the diode ZD1 is connected with the pin 2 of the first transistor Q1, the anode of the diode ZD1 is grounded, and the first capacitor C1 is connected with the two ends of the diode ZD1 in parallel; the base electrode of the second transistor Q2 is connected with the output end of the sampling circuit, the emitting electrode of the second transistor Q2 is grounded, and the collecting electrode of the second transistor Q2 is connected with the voltage comparison alarm circuit. The ninth resistor R9 and the discharge resistor inside the discharge rod form a series connection, and when the circuit forms a loop, the ninth resistor R9 and the discharge resistor form a voltage division, so that the current of the series circuit is equal to that of the U = IR U string by calculation: u9= R string: the ninth resistor R9 obtains an OD acquisition signal; the power supply sampling management chip U4 can adopt NSI1312x series isolation voltage sampling chips and is used for limiting the discharge voltage collected from the discharge rod so as not to be too large and damage the internal structure of the alarm indicator; the first transistor Q1 is a common NPN transistor, and is used as a switch IN the circuit, the first transistor Q1 determines through a signal transmitted by U4 to output a high level signal from an out section, an out (pin 2) port of the chip of the first transistor Q1 is normally at a high level, the second transistor Q2 is turned on, and when signal transmission occurs, the out pin emits a low level, and the low level is provided for an IN1+ (pin 3) potential signal of the second comparator U3.

According to an embodiment of the present application, a tenth resistor R10 is connected in parallel to both ends of the ninth resistor R9; r10 is a resistor device with a protection function and is mainly used for clamping voltage when a circuit bears overvoltage and absorbing redundant voltage to protect sensitive devices.

According to an embodiment of the present application, the OD terminal of the power sampling management chip U4 is connected to the ninth resistor R9 through the eighth resistor R8 and the fuse F1 connected in series in sequence. The fuse F1 and the ninth resistor R9 are mainly used for clamping current when the circuit bears overcurrent and absorbing redundant current voltage to protect sensitive devices.

According to one embodiment of the application, the voltage comparison alarm circuit comprises a third transistor Q3, a fourth transistor Q4, a first comparator U1, a second comparator U3 and a buzzer; the IN1+ end of the second comparator U3 is connected with the sampling circuit; the IN 1-end of the second comparator U3 is connected with a reference voltage, the OUT1 end of the second comparator U3 is connected with the collector of the third transistor Q3, the OUT2 end of the second comparator U3 is connected with the base of the third transistor Q3, and the emitter of the third transistor Q3 is connected with the input end of the buzzer; the IN 2-end of the second comparator U3 is connected with the base electrode of the fourth transistor Q4, the IN2+ end of the second comparator U3 is connected with the IN1+ end of the first comparator U1, the IN 1-end of the first comparator U1 is connected with the emitter electrode of the fourth transistor Q4, the OUT1 end of the first comparator U1 is connected with the collector electrode of the fourth transistor Q4, and an indicator light LED1 and a second capacitor C2 which are sequentially connected IN series are connected between the collector electrode of the fourth transistor Q4 and the VCC end of the first comparator U1. The second comparator U3 is two groups of comparison chips and is used for realizing function alarm, so that the buzzer sends out a sound of dropping and alarming to prompt alarm. The IN1+ terminal and the IN 1-terminal form a comparison circuit, when the IN1+ pin receives a high level signal sent by a superior circuit, the out1 output is subjected to level inversion, and sends a high level signal to the buzzer. The IN2 is IN a high potential at ordinary times, the output of the OUT2 end is IN a low potential, when the current end gives a signal, the IN1 end of the first comparator U1 outputs a low potential signal, the third triode Q3 is conducted, the level of the IN 2-pin of the chip of the second comparator U3 is pulled down, and the OUT2 end outputs a high potential to conduct the second triode Q2 and drive the buzzer to alarm.

According to one embodiment of the application, the voltage comparison alarm circuit further comprises a voltage division protection circuit, wherein the voltage division protection circuit comprises a sixth resistor R6 and a seventh resistor R7 which are sequentially connected with a 5V voltage source; the IN 1-end of the second comparator U3 is connected with the connection joint between the sixth resistor R6 and the seventh resistor R7. The sixth resistor R6 and the seventh resistor R7 form a voltage dividing circuit, and the IN-reference voltage that can be supplied to the second comparator U3 by calculating UR6/UR7= R6/R7.

According to one embodiment of the present application, the power circuit includes a power conversion chip U2 for converting a 9v power to a 5v power. The power supply conversion chip U2 can adopt a power supply voltage stabilizing 7805 chip, and is mainly used for converting voltage and stabilizing voltage, and converting a 9v power supply into a 5v power supply to provide necessary voltage for a working chip.

According to an embodiment of the application, power supply circuit still includes battery protection unit, battery protection unit includes lithium electricity protection chip U5, 1 foot and the voltage comparison warning circuit of lithium electricity protection chip U5 are connected, 2 feet ground connection of lithium electricity protection chip U5, and 3 feet and the 5V input power supply of lithium electricity protection chip U5 are connected, and 4 feet and the 5 feet of lithium electricity protection chip U5 pass through switching circuit ground connection. The lithium battery protection chip U5 is a DW03 monitoring lithium battery protection chip. The 4 feet and the 5 feet (VM) of the lithium electric protection chip U5 are respectively input and grounded through a fifth transistor Q5 and a sixth transistor Q6, and the 1 foot VT is a testing pin position. The DWO3 monitors the voltage and current of the battery and protects the individual rechargeable lithium batteries from damage due to overcharge voltage, overdischarge voltage, overcharge current, overdischarge current, short circuits, etc. by disconnecting the charger or the load. If no abnormal condition is detected in the normal working mode, the output pipe is always opened, and the charging and discharging processes can be freely switched.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. The residual charge discharge alarm indicator for the electrical test is characterized by comprising a sampling circuit, a voltage comparison alarm circuit and a power supply circuit which are sequentially connected; the sampling circuit is respectively connected with the discharge end and the grounding end of the discharge rod to form voltage division; the voltage comparison alarm circuit is connected between the sampling circuit and the power supply circuit and used for comparing the discharge voltage acquired by the sampling circuit with a set value and giving an alarm when the discharge voltage is greater than the set value.

2. The electrical test discharge residual charge alarm indicator according to claim 1, wherein the sampling circuit comprises a ninth resistor R9, a power sampling management chip U4, a first transistor Q1, a first capacitor C1, a fifth capacitor C5, a diode ZD1 and a second transistor Q2; the ninth resistor R9 is connected with a discharge rod of a test instrument in series, the OD end of the power supply sampling management chip U4 is connected with the ninth resistor R9, the CS end of the power supply sampling management chip U4 is connected with the pin 1 of the first transistor Q1, the CS end of the power supply sampling management chip U4 is connected with the pin 3 of the first transistor Q1, the TD end of the power supply sampling management chip U4 is connected with the pin 4 of the first transistor Q1, the VCC end of the power supply sampling management chip U4 is respectively connected with one end of the fifth capacitor C5 and the power supply, the GND end of the power supply sampling management chip U4 and the other end of the fifth capacitor C5 are both grounded, the cathode of the diode ZD1 is connected with the pin 2 of the first transistor Q1, the anode of the diode ZD1 is grounded, and the first capacitor C1 is connected with the two ends of the diode ZD1 in parallel; the base electrode of the second transistor Q2 is connected with the output end of the sampling circuit, the emitter electrode of the second transistor Q2 is grounded, and the collector electrode of the second transistor Q2 is connected with the voltage comparison alarm circuit.

3. The electrical test discharge residual charge alarm indicator according to claim 2, characterized in that a tenth resistor R10 is connected in parallel to both ends of the ninth resistor R9.

4. The electrical test discharge residual charge alarm indicator according to claim 2 or 3, wherein the OD terminal of the power sampling management chip U4 is connected with a ninth resistor R9 through an eighth resistor R8 and a fuse F1 which are connected in series in sequence.

5. The electrical test discharge residual charge alarm indicator according to claim 1, wherein said voltage comparison alarm circuit comprises a third transistor Q3, a fourth transistor Q4, a first comparator U1, a second comparator U3 and a buzzer; the IN1+ end of the second comparator U3 is connected with the sampling circuit; the IN 1-end of the second comparator U3 is connected with the reference voltage, the OUT 1-end of the second comparator U3 is connected with the collector of the third transistor Q3, the OUT 2-end of the second comparator U3 is connected with the base of the third transistor Q3, and the emitter of the third transistor Q3 is connected with the input end of the buzzer; the IN 2-end of the second comparator U3 is connected with the base electrode of the fourth transistor Q4, the IN2+ end of the second comparator U3 is connected with the IN1+ end of the first comparator U1, the IN 1-end of the first comparator U1 is connected with the emitting electrode of the fourth transistor Q4, the OUT1 end of the first comparator U1 is connected with the collecting electrode of the fourth transistor Q4, and an indicator light LED1 and a second capacitor C2 which are sequentially connected IN series are connected between the collecting electrode of the fourth transistor Q4 and the VCC end of the first comparator U1.

6. The electrical test discharge residual charge alarm indicator according to claim 5, wherein said voltage comparison alarm circuit further comprises a voltage division protection circuit, said voltage division protection circuit comprising a sixth resistor R6 and a seventh resistor R7 connected in sequence to a 5V voltage source; the IN 1-end of the second comparator U3 is connected with the connection joint between the sixth resistor R6 and the seventh resistor R7.

7. The electrical test discharge residual charge alarm indicator of claim 1, wherein said power circuit comprises a power conversion chip U2 for converting a 9v power supply to a 5v power supply.

8. The electrical test discharge residual charge alarm indicator according to claim 7, wherein the power circuit further comprises a battery protection unit, the battery protection unit comprises a lithium battery protection chip U5, pin 1 of the lithium battery protection chip U5 is connected with the voltage comparison alarm circuit, pin 2 of the lithium battery protection chip U5 is grounded, pin 3 of the lithium battery protection chip U5 is connected with the 5V input power supply, and pin 4 and pin 5 of the lithium battery protection chip U5 are grounded through a switch circuit.