Insulation monitoring device for high-voltage power distribution system

By designing the insulation monitoring device of the high-voltage distribution system, one-click detection is realized, which solves the problems of low insulation resistance detection efficiency, large equipment loss and safety hazards, and improves detection efficiency and safety.

CN223123161UActive Publication Date: 2025-07-18SHANDONG YOUPUNUO TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202422160704.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-04
Publication Date
2025-07-18
Estimated Expiration
2034-09-04

AI Technical Summary

Technical Problem

The traditional insulation resistance detection method is inefficient, has large workloads of personnel, serious equipment losses and poses safety hazards.

Method used

An insulation monitoring device for high-voltage distribution system is designed, including an instrument host and display screen, and uses high-voltage coupler, main control board, control chip, power module, acquisition module and communication module to realize one-click testing, reduce equipment operation and enhance safety.

Benefits of technology

Improve detection efficiency, reduce equipment losses, ensure operational safety, and simplify processes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of insulation detection, and relates to an insulation monitoring device for a high-voltage power distribution system, which comprises an instrument host and a display screen, the instrument host comprises a high-voltage coupler and a main control board with P1-P11 connecting ports, the high-voltage coupler is electrically connected with the main control board, and the display screen is electrically connected with the main control board; the main control board is provided with a control chip, the control chip is electrically connected with a power supply module, an acquisition module, an eight-path ADC acquisition gear amplification module, a communication module, a buzzer and an LED indicating lamp on the main control board, the power supply module is electrically connected with the boost module, and the high-voltage coupler is electrically connected with the boost module, the acquisition module and a resistor to be tested. And the communication module is connected with an upper computer to realize data interaction. The test is completed by one key, and the efficiency is high; frequent opening and closing of grounding, opening and closing of a cabinet door and shaking-out and shaking-in are not needed, and equipment loss is almost avoided; the process is extremely simple, and the safety problem is solved due to the design of multiple high-voltage isolation circuits.
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Description

Technical Field

[0001] The utility model belongs to the technical field of insulation detection, and in particular relates to an insulation monitoring device for a high-voltage power distribution system. Background Art

[0002] Preventive monitoring is an important part of transformer or motor operation and maintenance, and is one of the effective means to ensure the safe operation of equipment and systems. According to the verification regulations, high-voltage motors and important cables must be tested for insulation before they are powered on. The traditional insulation resistance detection method is to use a handheld electronic megger or a traditional hand-cranked megger to manually detect by opening the equipment cabinet door. This method brings many disadvantages:

[0003] 1. Large manpower investment and low efficiency: Industrial enterprises require insulation resistance to be measured once every half a month, especially in places where insulation resistance is prone to problems, such as high-pressure water pumps and motors in humid environments; the workload of maintenance personnel is very large and the maintenance time is long;

[0004] 2. Continuous loss of equipment: The insulation resistance measurement requires a series of operations on the cabinet, such as opening and closing the ground, opening and closing the cabinet door, and swinging in and out. Over time, the grounding, buckles and other positions are prone to damage, which greatly reduces the service life of the cabinet;

[0005] 3. Safety issues: The entire insulation test process requires operators to strictly follow the procedures. Any negligence will cause safety accidents and lead to personnel or equipment losses. Summary of the invention

[0006] The purpose of the utility model is to provide a high-voltage power distribution system insulation monitoring device to solve the deficiencies of the prior art. The technical solution adopted by the utility model is as follows:

[0007] The insulation monitoring device of a high-voltage power distribution system comprises: an instrument host and a display screen, wherein the instrument host comprises a high-voltage coupler and a main control board with a P1-P11 connection port, the high-voltage coupler is electrically connected to the main control board, and the display screen is electrically connected to the main control board; a control chip is arranged on the main control board, and the control chip is electrically connected to a power module, an acquisition module, an 8-channel ADC acquisition gear amplification module and a communication module on the main control board respectively, the power module is electrically connected to a boost module, the high-voltage coupler is electrically connected to the boost module, the acquisition module and a resistance to be measured respectively, and the communication module is connected to a host computer to realize data interaction.

[0008] Preferably, the 8-channel ADC acquisition gear amplification module includes a single-ended 8-channel multiplexer chip U2 and its drive circuit. One end of resistor R25 is connected to the ADC2 signal, the ADC2 signal is connected to the ADC interface of the control chip, the other end of R25 is connected to pin 3 of operational amplifier U4, one end of capacitor C19 is connected to pin 3 of U4, and the other end of C19 is grounded. Pin 1 of U4 is connected to one end of sliding resistor R17, the other end of R17 is connected to pin 8 of U4, pin 7 of U4 is connected to the slider of R17 and also to the positive 5V power supply, pin 4 of U4 is connected to the -5V power supply, pin 6 of U4 is connected to one end of resistor R23, the other end of R23 is connected to one end of capacitor C18, the other end of C18 is grounded, one end of resistor R8 is connected to pin 6 of U4, the other end of R8 is connected to one end of resistor R7, the other end of R7 is connected to one end of resistor R6, the other end of R6 is connected to one end of resistor R5, the other end of R5 is connected to one end of resistor R4, the other end of R4 is connected to one end of resistor R3, the other end of R3 is connected to one end of resistor R2, the other end of R2 is connected to one end of resistor R1, and the other end of R1 is grounded. Pin 4 of U2 is connected to one end of R8, pin 2 of U2 is connected between R7 and R8, pin 5 of U2 is connected between R6 and R7, pin 1 of U2 is connected between R5 and R6, pin 12 of U2 is connected between R4 and R5, pin 15 of U2 is connected between R3 and R4, pin 14 of U2 is connected between R2 and R3, pin 13 of U2 is connected between R1 and R2, pin 3 of U2 is connected to pin 2 of U4, pin 7 of U2 is connected to the negative 5V power supply and one ends of capacitors C6, C7, C8, and the other ends of C6, C7, C8 are grounded, pin 8 of U2 is grounded, pin 16 of U2 is connected to the positive 5V power supply and one ends of capacitors C3, C4, C5, and the other ends of C3, C4, C5 are grounded, pin 9 of U2 is connected to one end of resistor R15, pin 10 of U2 is connected to one end of resistor R10, pin 11 of U2 is connected to one end of resistor R9, the other ends of R9, R10, and R15 are connected together and connected to the positive 5V voltage and one end of resistor R14, and the other end of R14 is connected to pin 6 of U2;

[0009] In the boost module, the positive electrode of the TVS diode D10 is grounded, the negative electrode of D10 is connected to the power supply +5V-1, the positive electrode of the LED lamp D9 is connected to the power supply +5V-1, the negative electrode of D9 is connected to one end of the resistor R61, the other end of R61 is grounded, one end of the capacitor C46 is connected to the power supply +5V-1, the other end of C46 is grounded, one end of the resistor R57 is connected to the power supply +5V-1, the other end of R57 is connected to one end of the capacitor C44 and the base of the triode Q4, the other end of C44 is connected to one end of the resistor R59, the other end of R59 is connected to one end of the first primary coil of the voltage transformer T1, the other end of the first primary coil of T1 is connected to the power supply +5V-1 and the collector of Q4, the emitter of Q4 is connected to one end of the second primary coil of T1, the other end of the second primary coil of T1 is grounded, one end of the secondary coil of T1 is connected to the positive electrode of the diode D7, the negative electrode of D7 is connected to one end of the capacitor C43, the other end of C43 is connected to one end of the capacitor C48, the other end of C48 is connected to the positive electrode of the diode D17, the negative electrode of D17 is connected to the positive electrode of D7, the other end of the secondary coil of T1 is connected between C43 and C48, the positive electrode of the diode D8 is connected to one end of C43, the negative electrode of D8 is connected to one end of the capacitor C45, the other end of C45 is connected to one end of the capacitor C49, the other end of C49 is connected to the positive electrode of the diode D11, the negative electrode of D11 is connected to the other end of C48, the positive electrode of D7 is also connected to the other end of C45, the negative electrode of D8 is also grounded and connected to one end of the capacitor C47, the other end of C47 is connected to the pin 1 of the pin header P13 and GV+, the pin 2 of P13 is connected to the positive electrode of D11;

[0010] One end of the resistor R49 is connected to the OUT1 signal, the other end of R49 is connected to the pin 2 of the buck switching regulator U10 and one end of the resistor R46, the other end of R46 is grounded, the pin 1 of U10 is connected to one end of the inductor L2, one end of the capacitor C37, and the negative electrode of the diode D5, the other end of C37 is connected to the pin 8 of U10, the positive electrode of D5 is grounded, the other end of L2 is connected to one end of the capacitors C35 and C36 and the power supply +5V-1, the other ends of C35 and C36 are grounded, the pin 3 of U10 is connected to one end of the capacitor C39, the other end of C39 is connected to one end of the resistor R48, the other end of R48 is grounded, the pin 5 of U10 is grounded, the pin 6 of U10 is connected to one end of the resistor R47, the other end of R47 is grounded, the pin 7 of U10 is connected to the +12V power supply, the capacitor C38 is connected between the pin 7 of U10 and the ground, the pin 4 of U10 is connected to one end of the resistor R50, the other end of R50 is connected to the power supply +5V-1, the pin 4 of U10 is also connected to one end of the sliding resistor R51, the other end of R51 is connected to the pins 5 and 6 of U11, the slider of R51 is connected to the other end of R51, the pins 7 and 4 of U11 are grounded, the pin 1 of U11 is connected to the CS signal, the pin 2 of U11 is connected to the SCK signal, the pin 3 of U11 is connected to the SI signal, the pin 8 of U11 is connected to the 3.3V positive power supply, one end of the capacitor C41 is connected to the pin 8 of U11, and the other end is grounded.

[0011] Preferably, in the high-voltage isolation circuit, one end of resistor R8 is connected to GV+, the other end of R8 is connected to one end of resistor R9, pins 1 and 2 of pin P4 are connected to one end of R8, the other end of R9 is connected to pin 1 of relay K1 and one end of resistor R30, the other end of R30 is connected to one end of resistor R1, the other end of R1 is connected to one end of P5 SMB, the other end of P5 SMB is grounded, pin 3 of K1 is connected to the negative pole of LED D2, the positive pole of D2 is connected to one end of resistor R7, the other end of R7 is connected to the +12V power supply, pin 4 of K1 is connected to the positive pole of diode D5 and the +12V power supply, the negative pole of D5 is grounded, pin 2 of K1 is connected to pin 1 of relay K2, pin 3 of K2 is connected to pin 3 of K1, pin 4 of K2 is connected to pin 4 of K1, pin 2 of K2 is connected to terminal block P1, terminal block P3 is connected to one end of SMB P7, the other end of P7 is grounded, pin 1 of power module U1 is connected to the negative pole of diode D1, the positive pole of D1 is connected to pins 1 and 2 of pin P2, pins 3 and 4 of P2 are connected to pins 23 and 24 of U1, capacitor C1 is connected in parallel between pin 1 and pin 23 of U1, pin 23 is grounded at the same time, pin 13 of U1 outputs +12V voltage, pin 12 of U1 is grounded, capacitor C2 is connected in parallel between pin 13 and pin 12 of U1, pins 11 and 15 of U1 are left floating.

[0012] Preferably, the control chip is electrically connected to the buzzer and LED indicator on the main control board.

[0013] Preferably, the power module includes power supply one and power supply two. Power supply one includes a rectification circuit, a positive and negative power conversion module, and a 12V to 3.3V circuit. Power supply two includes a DC-DC adjustable voltage module.

[0014] Preferably, the communication module includes a 485 communication interface and a 232 communication interface.

[0015] Preferably, the control chip uses an STM32L051C8T6 chip.

[0016] Preferably, the display screen is electrically connected to the main control board through connection ports P1, P2, P3, and P4.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. The test can be completed with one key, with high efficiency and minimal workload for personnel.

[0019] 2. There is no need to frequently open and close the ground connection, open and close the cabinet door, or shake in and out, resulting in almost no equipment loss.

[0020] 3. The process is extremely simple, and there is a multiple high-voltage isolation circuit design to solve safety problems. Description of the Drawings

[0021] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the accompanying drawings:

[0022] Figure 1 is the overall architecture diagram of the insulation monitoring device according to the embodiment of the present utility model;

[0023] Figure 2 is the functional schematic diagram of the main control board of the insulation monitoring device according to the embodiment of the present utility model;

[0024] Figure 3 is the circuit diagram of the 8-channel ADC acquisition gain module according to the embodiment of the present utility model;

[0025] Figure 4 is the circuit diagram of the low-voltage to high-voltage circuit according to the embodiment of the present utility model;

[0026] Figure 5 is the circuit diagram for realizing the automatic adjustment function according to the embodiment of the present utility model;

[0027] Figure 6 is the circuit diagram of the isolation circuit according to the embodiment of the present utility model. Detailed implementation manners

[0028] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] As Figure 1 shown, the insulation monitoring device for the high-voltage power distribution system includes: an instrument main unit and a display screen. The instrument main unit includes a high-voltage coupler and a main control board with connection ports P1 - P11. The high-voltage coupler is connected to the main control board under 2500V DC power, and is used to isolate the main control board from the external 6KV high-voltage terminal. The display screen is electrically connected to the main control board through connection ports P1, P2, P3, and P4. Connection ports P5, P6, and P7 are 485 communication interfaces. P8 and P9 are dry contacts (male headers), which are connected to the normally closed auxiliary contacts of the high-voltage circuit breaker. P10 and P11 are connected to the secondary side (female header) of the zero-sequence current transformer. The high-voltage coupler includes a URH2405 - 6WR3 voltage stabilization isolation circuit and a relay part.

[0030] As Figure 2As shown in the figure, a control chip is provided on the main control board. The control chip is electrically connected to a power module, a collection module, an 8-channel ADC collection range amplification module, a communication module, a buzzer, and an LED indicator on the main control board respectively. The power module is electrically connected to a boost module. The high-voltage coupler is electrically connected to the boost module, the collection module, and the resistance to be measured respectively. The communication module is connected to the upper computer to realize data interaction.

[0031] The power module includes Power Supply 1 and Power Supply 2. Among them, Power Supply 1 consists of a rectification circuit, a positive and negative power conversion module, and a 12V to 3.3V circuit. Power Supply 2 consists of a DC-DC adjustable voltage module (MP1584EN). Power Supply 1 is used to supply power to the control chip, operational amplifier, collection module, and single-ended 8-channel multiplexer CD4051. Power Supply 2 is used to supply power to the boost module.

[0032] The communication module includes a 485 communication interface and a 232 communication interface. The 232 communication interface is used to connect to the display screen and transmit the measured resistance value to the display screen. The 485 communication interface is an optional communication interface and is used to connect to the upper computer. The instrument host and the display screen are placed in the power cabinet, and the upper computer is set in the monitoring room.

[0033] The control chip uses an STM32L051C8T6 chip. The display screen, buzzer, and LED indicator are all conventional devices.

[0034] The collection module is used to collect the current of the object to be measured, and then calculate the resistance value of the object to be measured.

[0035] The 8-channel ADC collection range amplification module includes a single-ended 8-channel multiplexer chip U2 (model CD4051) and its drive circuit. Its function is to perform 8-range adjustable analog signal amplification on the collected signal. For example Figure 3As shown in the figure, the circuit structure of the 8-channel ADC acquisition gain amplification module is as follows: One end of resistor R25 is connected to the ADC2 signal, and the ADC2 signal is connected to the ADC interface (acquisition interface) of the control chip. The other end of R25 is connected to pin 3 of operational amplifier U4 (model OPA277). One end of capacitor C19 is connected to pin 3 of U4, and the other end of C19 is grounded. Pin 1 of U4 is connected to one end of potentiometer R17, the other end of R17 is connected to pin 8 of U4, pin 7 of U4 is connected to the slider of R17 and also to the positive 5V power supply. Pin 4 of U4 is connected to the -5V power supply, pin 6 of U4 is connected to one end of resistor R23, the other end of R23 is connected to one end of capacitor C18, and the other end of C18 is grounded. One end of resistor R8 is connected to pin 6 of U4, the other end of R8 is connected to one end of resistor R7, the other end of R7 is connected to one end of resistor R6, the other end of R6 is connected to one end of resistor R5, the other end of R5 is connected to one end of resistor R4, the other end of R4 is connected to one end of resistor R3, the other end of R3 is connected to one end of resistor R2, the other end of R2 is connected to one end of resistor R1, and the other end of R1 is grounded. Pin 4 of single-ended 8-channel multiplexer chip U2 is connected to one end of R8, pin 2 of U2 is connected between R7 and R8, pin 5 of U2 is connected between R6 and R7, pin 1 of U2 is connected between R5 and R6, pin 12 of U2 is connected between R4 and R5, pin 15 of U2 is connected between R3 and R4, pin 14 of U2 is connected between R2 and R3, pin 13 of U2 is connected between R1 and R2, pin 3 of U2 is connected to pin 2 of U4, pin 7 of U2 is connected to the -5V power supply and one ends of capacitors C6, C7, and C8, and the other ends of C6, C7, and C8 are grounded. Pin 8 of U2 is grounded, pin 16 of U2 is connected to the positive 5V power supply and one ends of capacitors C3, C4, and C5, and the other ends of C3, C4, and C5 are grounded. Pin 9 of U2 is connected to one end of resistor R15, pin 10 of U2 is connected to one end of resistor R10, pin 11 of U2 is connected to one end of resistor R9. The other ends of R9, R10, and R15 are connected together and connected to the positive 5V voltage and one end of resistor R14, and the other end of R14 is connected to pin 6 of U2. In the figure, ADC IN1 is a net label, and there is an identical label on the microcontroller. These two identical labels indicate that they need to be connected together during circuit design.

[0036] R23 and C18 form a low-pass filter circuit, which can filter out high-frequency noise and improve the accuracy of the output signal. R1, R2, R3, R4, R5, R6, R7, R8 cooperate with U2 to perform high-precision fixed-value adjustment of the amplification factor of the operational amplifier.

[0037] Figure 3 In it, the function of the resistor is to set the amplification factor. is the enable signal. The function of is to enable the amplification factor.

[0038] Such as Figure 4As shown in the figure, the boost module: the positive electrode of the TVS diode D10 is grounded, the negative electrode of D10 is connected to the power supply +5V-1, the positive electrode of the LED lamp D9 is connected to the power supply +5V-1, the negative electrode of D9 is connected to one end of the resistor R61, the other end of R61 is grounded, one end of the capacitor C46 is connected to the power supply +5V-1, the other end of C46 is grounded, one end of the resistor R57 is connected to the power supply +5V-1, the other end of R57 is connected to one end of the capacitor C44 and the base of the triode Q4, the other end of C44 is connected to one end of the resistor R59, the other end of R59 is connected to one end of the first primary coil of the voltage transformer T1, the other end of the first primary coil of T1 is connected to the power supply +5V-1 and the collector of Q4, the emitter of Q4 is connected to one end of the second primary coil of T1, the other end of the second primary coil of T1 is grounded, one end of the secondary coil of T1 is connected to the positive electrode of the diode D7 (model RFC4K), the negative electrode of D7 is connected to one end of the capacitor C43, the other end of C43 is connected to one end of the capacitor C48, the other end of C48 is connected to the positive electrode of the diode D17 (model RFC4K), the negative electrode of D17 is connected to the positive electrode of D7, the other end of the secondary coil of T1 is connected between C43 and C48, the positive electrode of the diode D8 (model RFC4K) is connected to one end of C43, the negative electrode of D8 is connected to one end of the capacitor C45, the other end of C45 is connected to one end of the capacitor C49, the other end of C49 is connected to the positive electrode of the diode D11 (model RFC4K), the negative electrode of D11 is connected to the other end of C48, the positive electrode of D7 is also connected to the other end of C45, the negative electrode of D8 is also grounded and connected to one end of the capacitor C47, the other end of C47 is connected to the pin 1 of the pin header P13 and GV+, the pin 2 of P13 is connected to the positive electrode of D11. P13 is connected to the high-voltage isolation module, which is a 2500V DC high-voltage output interface.

[0039] Figure 4 In the figure, P13 is the high-voltage output interface, the resistor R61 is for current limiting, and R57, R59, C44 and Q4 form a resonant circuit. The Header2 in the figure is the description of the device and is a 2P socket.

[0040] As Figure 5As shown, the automatic adjustment function is jointly completed by the acquisition module, the boost module, the power supply module, and the control chip: One end of the resistor R49 is connected to the OUT1 signal, and the other end of R49 is connected to pin 2 of the high-frequency buck switching regulator U10 (model number MP1584EN) and one end of the resistor R46. The other end of R46 is grounded. Pin 1 of U10 is connected to one end of the inductor L2 (model number 4R7(15uH)), one end of the capacitor C37, and the negative pole of the diode D5 (model number SS34). The other end of C37 is connected to pin 8 of U10. The positive pole of D5 is grounded. The other end of L2 is connected to one end of the capacitors C35 and C36 and the power supply +5V-1. The other ends of C35 and C36 are grounded. Pin 3 of U10 is connected to one end of the capacitor C39. The other end of C39 is connected to one end of the resistor R48. The other end of R48 is grounded. Pin 5 of U10 is grounded. Pin 6 of U10 is connected to one end of the resistor R47. The other end of R47 is grounded. Pin 7 of U10 is connected to the +12V power supply. The capacitor C38 is connected between pin 7 of U10 and ground. Pin 4 of U10 is connected to one end of the resistor R50. The other end of R50 is connected to the power supply +5V-1. Pin 4 of U10 is also connected to one end of the potentiometer R51. The other end of R51 is connected to pins 5 and 6 of U11 (model number MCP41010-1 / SN). The wiper of R51 is connected to the other end of R51. Pins 7 and 4 of U11 are grounded. Pin 1 of U11 is connected to the CS signal. Pin 2 of U11 is connected to the SCK signal. Pin 3 of U11 is connected to the SI signal. Pin 8 of U11 is connected to the positive 3.3V power supply. One end of the capacitor C41 is connected to pin 8 of U11, and the other end is grounded.

[0041] CS is the chip select pin for SPI communication. The SCK signal is the clock pin for SPI communication, and the SI signal is the data pin for SPI communication.

[0042] The high-voltage automatic adjustment function automatically adjusts the DC voltage of 5V within the range of 3 - 8V, then boosts it to 2500V through a step-up transformer, and automatically stabilizes the voltage according to the load size. +5V-1 is connected to the step-up transformer for adjustment. mp1584en: High-frequency buck switching power supply.

[0043] +5V-1 and +5V mean that there are two separate +5V power supplies in the whole circuit. D5 and L2 cooperate with the power supply chip for buck operation.

[0044] Figure 5 Among them, the resistors R50 and R51 combined with U11 achieve the adjustment current of the output voltage of U10; R47 sets the operating frequency of U10, and R46 provides the power-on default level.

[0045] Such as Figure 6As shown in the figure, the high-voltage isolation circuit: One end of resistor R8 is connected to GV+, the other end of R8 is connected to one end of resistor R9, pins 1 and 2 of pin header P4 are connected to one end of R8, the other end of R9 is connected to pin 1 of relay K1 and one end of resistor R30, the other end of R30 is connected to one end of resistor R1, the other end of R1 is connected to one end of P5 SMB, the other end of P5 SMB is grounded, pin 3 of K1 is connected to the negative pole of LED D2, the positive pole of D2 is connected to one end of resistor R7, the other end of R7 is connected to the +12V power supply, pin 4 of K1 is connected to the positive pole of diode D5 (model 1N4007) and the +12V power supply, the negative pole of D5 is grounded, pin 2 of K1 is connected to pin 1 of relay K2, pin 3 of K2 is connected to pin 3 of K1, pin 4 of K2 is connected to pin 4 of K1, pin 2 of K2 is connected to terminal block P1, terminal block P3 is connected to one end of SMB P7, the other end of P7 is grounded, pin 1 of power module U1 (model URH2406P-6WR3) is connected to the negative pole of diode D1 (model 1N4007), the positive pole of D1 is connected to pins 1 and 2 of pin header P2, pins 3 and 4 of P2 are connected to pins 23 and 24 of U1, capacitor C1 is connected in parallel between pin 1 and pin 23 of U1, and pin 23 is grounded at the same time, pin 13 of U1 outputs +12V voltage, pin 12 of U1 is grounded, capacitor C2 is connected in parallel between pin 13 and pin 12 of U1, and pins 11 and 15 of U1 are left floating.

[0046] P4 is connected to the high-voltage excitation output terminal, Header2 is the device description and is a 2-pin socket. SMB is the SMB connector and is a plug. P2 is connected to the 12V power supply, and Header4 represents a 4-pin socket. P1 and P3 are two independent terminal blocks.

[0047] Working principle: Connect P11 and P12 of this device to the normally closed auxiliary contacts of the high-voltage circuit breaker. The acquisition module of this device measures the resistance value of the insulation resistance and displays the value through the liquid crystal screen. When the value is lower than the preset value, the LED lights flash and the buzzer gives an alarm. The high-voltage coupler has a high-voltage isolation function.

[0048] In the embodiments of the present invention, the technical features not described in detail are all prior art or conventional technical means and will not be elaborated here.

[0049] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, which are used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.

Claims

1. Insulation monitoring device for high-voltage power distribution system, comprising: An instrument main unit and a display screen, characterized in that the instrument main unit includes a high-voltage coupler and a main control board with P1 - P11 connection ports, the high-voltage coupler is electrically connected to the main control board, and the display screen is electrically connected to the main control board; a control chip is provided on the main control board, and the control chip is electrically connected to a power module, a collection module, an 8-channel ADC collection gear amplification module, and a communication module on the main control board respectively. The power module is electrically connected to a boost module, and the high-voltage coupler is electrically connected to the boost module, the collection module, and a resistance to be measured respectively. The communication module is connected to an upper computer to realize data interaction.

2. The insulation monitoring device for a high-voltage power distribution system according to claim 1, characterized in that The 8-channel ADC collection gear amplification module includes a single-ended 8-channel multiplexer chip U2 and its driving circuit. One end of a resistor R25 is connected to an ADC2 signal, the ADC2 signal is connected to the ADC interface of the control chip, the other end of R25 is connected to pin 3 of an operational amplifier U4, one end of a capacitor C19 is connected to pin 3 of U4, and the other end of C19 is grounded. Pin 1 of U4 is connected to one end of a sliding resistor R17, the other end of R17 is connected to pin 8 of U4, pin 7 of U4 is connected to the slider of R17 and is also connected to the positive 5V power supply at the same time. Pin 4 of U4 is connected to the -5V power supply, pin 6 of U4 is connected to one end of a resistor R23, the other end of R23 is connected to one end of a capacitor C18, and the other end of C18 is grounded. One end of a resistor R8 is connected to pin 6 of U4, the other end of R8 is connected to one end of a resistor R7, the other end of R7 is connected to one end of a resistor R6, the other end of R6 is connected to one end of a resistor R5, the other end of R5 is connected to one end of a resistor R4, the other end of R4 is connected to one end of a resistor R3, the other end of R3 is connected to one end of a resistor R2, the other end of R2 is connected to one end of a resistor R1, and the other end of R1 is grounded. Pin 4 of U2 is connected to one end of R8, pin 2 of U2 is connected between R7 and R8, pin 5 of U2 is connected between R6 and R7, pin 1 of U2 is connected between R5 and R6, pin 12 of U2 is connected between R4 and R5, pin 15 of U2 is connected between R3 and R4, pin 14 of U2 is connected between R2 and R3, pin 13 of U2 is connected between R1 and R2, pin 3 of U2 is connected to pin 2 of U4, pin 7 of U2 is connected to the negative 5V power supply and one ends of capacitors C6, C7, and C8, and the other ends of C6, C7, and C8 are grounded. Pin 8 of U2 is grounded, pin 16 of U2 is connected to the positive 5V power supply and one ends of capacitors C3, C4, and C5, and the other ends of C3, C4, and C5 are grounded. Pin 9 of U2 is connected to one end of a resistor R15, pin 10 of U2 is connected to one end of a resistor R10, pin 11 of U2 is connected to one end of a resistor R9, the other ends of R9, R10, and R15 are connected together and are connected to the positive 5V voltage and one end of a resistor R14, and the other end of R14 is connected to pin 6 of U2; In the boost module, the positive electrode of the TVS diode D10 is grounded, the negative electrode of D10 is connected to the power supply +5V-1, the positive electrode of the LED lamp D9 is connected to the power supply +5V-1, the negative electrode of D9 is connected to one end of the resistor R61, the other end of R61 is grounded, one end of the capacitor C46 is connected to the power supply +5V-1, the other end of C46 is grounded, one end of the resistor R57 is connected to the power supply +5V-1, the other end of R57 is connected to one end of the capacitor C44 and the base of the triode Q4, the other end of C44 is connected to one end of the resistor R59, the other end of R59 is connected to one end of the first primary coil of the voltage transformer T1, the other end of the first primary coil of T1 is connected to the power supply +5V-1 and the collector of Q4, the emitter of Q4 is connected to one end of the second primary coil of T1, the other end of the second primary coil of T1 is grounded, one end of the secondary coil of T1 is connected to the positive electrode of the diode D7, the negative electrode of D7 is connected to one end of the capacitor C43, the other end of C43 is connected to one end of the capacitor C48, the other end of C48 is connected to the positive electrode of the diode D17, the negative electrode of D17 is connected to the positive electrode of D7, the other end of the secondary coil of T1 is connected between C43 and C48, the positive electrode of the diode D8 is connected to one end of C43, the negative electrode of D8 is connected to one end of the capacitor C45, the other end of C45 is connected to one end of the capacitor C49, the other end of C49 is connected to the positive electrode of the diode D11, the negative electrode of D11 is connected to the other end of C48, the positive electrode of D7 is simultaneously connected to the other end of C45, the negative electrode of D8 is simultaneously grounded and connected to one end of the capacitor C47, the other end of C47 is connected to the pin 1 of the pin header P13 and GV+, and the pin 2 of P13 is connected to the positive electrode of D11; One end of the resistor R49 is connected to the OUT1 signal, the other end of R49 is connected to the pin 2 of the buck switching regulator U10 and one end of the resistor R46, the other end of R46 is grounded, the pin 1 of U10 is connected to one end of the inductor L2, one end of the capacitor C37, and the negative electrode of the diode D5, the other end of C37 is connected to the pin 8 of U10, the positive electrode of D5 is grounded, the other end of L2 is connected to one end of the capacitors C35 and C36 and the power supply +5V-1, the other ends of C35 and C36 are grounded, the pin 3 of U10 is connected to one end of the capacitor C39, the other end of C39 is connected to one end of the resistor R48, the other end of R48 is grounded, the pin 5 of U10 is grounded, the pin 6 of U10 is connected to one end of the resistor R47, the other end of R47 is grounded, the pin 7 of U10 is connected to the +12V power supply, the capacitor C38 is connected between the pin 7 of U10 and the ground, the pin 4 of U10 is connected to one end of the resistor R50, the other end of R50 is connected to the power supply +5V-1, the pin 4 of U10 is simultaneously connected to one end of the sliding resistor R51, the other end of R51 is connected to the pins 5 and 6 of U11, the sliding contact of R51 is connected to the other end of R51, the pins 7 and 4 of U11 are grounded, the pin 1 of U11 is connected to the CS signal, the pin 2 of U11 is connected to the SCK signal, the pin 3 of U11 is connected to the SI signal, the pin 8 of U11 is connected to the 3.3V positive power supply, one end of the capacitor C41 is connected to the pin 8 of U11, and the other end is grounded.

3. The insulation monitoring device for a high-voltage power distribution system according to claim 2, characterized in that In the high-voltage isolation circuit, one end of resistor R8 is connected to GV+, the other end of R8 is connected to one end of resistor R9, pins 1 and 2 of pin P4 are connected to one end of R8, the other end of R9 is connected to pin 1 of relay K1 and one end of resistor R30, the other end of R30 is connected to one end of resistor R1, the other end of R1 is connected to one end of P5 SMB, the other end of P5 SMB is grounded, pin 3 of K1 is connected to the negative electrode of LED D2, the positive electrode of D2 is connected to one end of resistor R7, the other end of R7 is connected to the +12V power supply, pin 4 of K1 is connected to the positive electrode of diode D5 and the +12V power supply, the negative electrode of D5 is grounded, pin 2 of K1 is connected to pin 1 of relay K2, pin 3 of K2 is connected to pin 3 of K1, pin 4 of K2 is connected to pin 4 of K1, pin 2 of K2 is connected to terminal block P1, terminal block P3 is connected to one end of SMB P7, the other end of P7 is grounded, pin 1 of power supply module U1 is connected to the negative electrode of diode D1, the positive electrode of D1 is connected to pins 1 and 2 of pin P2, pins 3 and 4 of P2 are connected to pins 23 and 24 of U1, capacitor C1 is connected in parallel between pin 1 and pin 23 of U1, and pin 23 is grounded at the same time, pin 13 of U1 outputs +12V voltage, pin 12 of U1 is grounded, capacitor C2 is connected in parallel between pin 13 and pin 12 of U1, and pins 11 and 15 of U1 are floating.

4. The insulation monitoring device for a high-voltage power distribution system according to claim 3, characterized in that, The control chip is electrically connected to the buzzer and LED indicator on the main control board.

5. The insulation monitoring device for a high-voltage power distribution system according to claim 3, characterized in that, The power supply module includes power supply one and power supply two. Power supply one includes a rectifier circuit, a positive and negative power conversion module, and a 12V to 3.3V circuit. Power supply two includes a DC-DC adjustable voltage module.

6. The insulation monitoring device for a high-voltage power distribution system according to claim 3, wherein The communication module includes a 485 communication interface and a 232 communication interface.

7. The insulation monitoring device for a high-voltage power distribution system according to claim 3, characterized in that, The control chip uses the STM32L051C8T6 chip.

8. The insulation monitoring device for a high-voltage power distribution system according to claim 3, characterized in that, The display screen is electrically connected to the main control board through connection ports P1, P2, P3, and P4.