Train DC110V insulation monitoring device

Abstract

The utility model provides a train DC110V insulation monitoring device which comprises a processor MCU, and the processor MCU is connected with a measuring module, a communication module, a power supply module and a clock module. The measurement module is connected with the IT power distribution system through the wiring terminal; the communication module comprises a Type-C module, a USB module and a DO module, the Type-C module is connected with the upper computer, and the DO module is connected with the alarm monitoring system through a communication cable; the power supply module comprises a voltage stabilization module, a voltage reduction module and a rectifier filter which are sequentially connected with the processor MCU, and the rectifier filter is connected with a VCC terminal. According to the scheme, the voltage of the IT power distribution system can be monitored on line, the ground insulation resistance of the positive bus and the ground insulation resistance of the negative bus are collected in real time, meanwhile, the functions of insulation fault early warning, fault alarming and the like are achieved, and the advantages of being high in integration level, accurate in alarming, high in anti-interference capacity and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the field of electrical safety, in particular to a DC110V insulation monitoring device for a train. Background Art

[0002] With the development of high-speed railways and high-speed trains, the requirements for train power distribution systems are becoming increasingly stringent. The IT power distribution system (IT) is a specialized electrical power supply system primarily used in high-speed trains, which place stringent requirements on electrical safety and power supply reliability. This system utilizes an ungrounded neutral point or high-impedance grounding, while the electrical equipment housings utilize protective grounding. In this system, the neutral point of the power transformer is ungrounded, while the exposed conductive parts of the electrical equipment are directly grounded, enhancing equipment safety and power supply reliability.

[0003] However, in order to ensure the safety of IT power distribution system, it is necessary to monitor the insulation condition of IT power distribution system to ground. In the existing technology, the insulation condition to ground is checked by manual detection, which is inefficient and poses a threat to the safety of workers. Therefore, a new type of train DC110V insulation monitoring device is proposed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a train DC110V insulation monitoring device to achieve real-time monitoring of the insulation condition of the IT power distribution system to the ground.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present utility model is:

[0006] Provided is a train DC110V insulation monitoring device, which includes a processor MCU, and the processor MCU is connected to a measurement module, a communication module, a power supply module and a clock module;

[0007] The measurement module is connected to the IT power distribution system through the terminal block;

[0008] The communication module includes a Type-C module, a USB module, and a DO module. The Type-C module is connected to the host computer, and the DO module is connected to the alarm monitoring system through a communication cable.

[0009] The power supply module includes a voltage stabilizing module, a voltage step-down module and a rectifier filter which are sequentially connected to the processor MCU, and the rectifier filter is connected to the VCC terminal.

[0010] Furthermore, it also includes a self-test switch, a reset switch, a display screen and a fault indicator light connected to the processor MCU.

[0011] Furthermore, the measurement module includes an ADC chip, an operational amplifier U7A, an operational amplifier U7B, an operational amplifier U9A, and an operational amplifier U9B, wherein the non-inverting input terminal of the operational amplifier U7A is connected to a resistor R42, a resistor R41, and a resistor R40 connected in series in sequence;

[0012] The non-inverting input terminal of the operational amplifier U7B is connected to a first resistor string, a second resistor string, and a third resistor string connected in parallel in sequence. The first resistor string includes a resistor R45, a resistor R44, and a resistor R43 connected in series in sequence. The second resistor string includes a resistor R47 and a resistor R48 connected in series in sequence. The third resistor string includes a resistor R56, a resistor R55, and a resistor R54 connected in series in sequence. A resistor R49, a resistor R52, and a resistor R57 are provided in series between the first resistor string, the second resistor string, and the third resistor string and the non-inverting input terminal of the operational amplifier U7B. The non-inverting input terminal of the operational amplifier U9B is connected to a resistor R64, a resistor R63, and a resistor R62 connected in series in sequence.

[0013] The inverting input terminals of the operational amplifier U7A, the operational amplifier U7B, and the operational amplifier U9B are connected in parallel and connected to the output terminal of the operational amplifier U9A through the resistor R66. The output terminals of the operational amplifier U7A, the operational amplifier U7B, and the operational amplifier U9A are all connected to the ADC chip. The non-inverting input terminal of the operational amplifier U9A is connected to the ADC chip, and the ADC chip is connected to the processor MCU.

[0014] The beneficial effects of the present invention are as follows: the present invention can collect the insulation resistance of the positive and negative busbars to the ground in real time based on the online monitoring of the voltage of the IT power distribution system, and has the functions of insulation fault early warning and fault alarm, and has the characteristics of high integration, accurate alarm, and strong anti-interference ability.

[0015] In the measurement module, resistors R43, R44, and R45 form the positive bridge arm, resistors R54, R55, and R56 form the negative bridge arm, and resistors R47 and R48 form the transition resistor. The circuit formed by operational amplifiers U7A and U7B uses an ADC chip to obtain the voltage across the positive bridge arm resistor. The circuit formed by operational amplifiers U7A, U9B, and U9A uses an ADC chip to obtain the voltage U across the power supply. The measured data is input into the MCU for analysis of the insulation condition to ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the principle block diagram of the train DC110V insulation monitoring device.

[0017] Figure 2 This is the circuit diagram of the measurement module. DETAILED DESCRIPTION

[0018] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0019] like Figure 1 As shown, a train DC110V insulation monitoring device includes a processor MCU, and the processor MCU is connected to a measurement module, a communication module, a power supply module and a clock module.

[0020] The measurement module is connected to the IT power distribution system through the terminal block, and the clock module provides a clock signal for the processor MCU.

[0021] The communication module includes a Type-C module, a USB module and a DO module. The Type-C module is connected to the host computer, and the DO module is connected to the alarm monitoring system through a communication cable.

[0022] The power supply module includes a voltage regulator module, a step-down module and a rectifier filter which are connected to the processor MCU in sequence. The rectifier filter is connected to the VCC terminal. The voltage regulator module adopts a 5V to 3.3V module equipped with a voltage regulator chip RT9013-33.

[0023] This solution can collect the insulation resistance of the positive and negative busbars to the ground in real time based on the online monitoring of the IT power distribution system voltage. It also has functions such as insulation fault early warning and fault alarm. It has the characteristics of high integration, accurate alarm, and strong anti-interference ability.

[0024] The communication module is set up with three modules. The first part is the host computer communication module, which is connected to the host computer through a Type-C cable, and can realize real-time viewing of device collected data, setting thresholds and other functions; the second part is the USB module, which can download the data stored in the monitoring device through USB; the third part is the DO module, which outputs a 110V alarm signal to the monitoring system network through the signal given by the MCU.

[0025] The system also includes a self-test switch, a reset switch, a display screen, and a fault indicator light connected to the MCU. The self-test switch is used to activate the self-test function of the entire monitoring device, the reset switch is used to activate the self-reset function of the monitoring device, and the display screen is used to display the status information of the entire monitoring device and the collected data information.

[0026] In this embodiment, the measurement module includes an ADC chip, an operational amplifier U7A, an operational amplifier U7B, an operational amplifier U9A, and an operational amplifier U9B. The non-inverting input terminal of the operational amplifier U7A is connected to the resistor R42, the resistor R41, and the resistor R40 connected in series in sequence;

[0027] The non-inverting input terminal of the operational amplifier U7B is connected to a first resistor string, a second resistor string, and a third resistor string connected in parallel in sequence. The first resistor string includes a resistor R45, a resistor R44, and a resistor R43 connected in series in sequence. The second resistor string includes a resistor R47 and a resistor R48 connected in series in sequence. The third resistor string includes a resistor R56, a resistor R55, and a resistor R54 connected in series in sequence. A resistor R49, a resistor R52, and a resistor R57 are provided in series between the first resistor string, the second resistor string, and the third resistor string and the non-inverting input terminal of the operational amplifier U7B. The non-inverting input terminal of the operational amplifier U9B is connected to a resistor R64, a resistor R63, and a resistor R62 connected in series in sequence.

[0028] The inverting input terminals of the operational amplifier U7A, the operational amplifier U7B, and the operational amplifier U9B are connected in parallel and connected to the output terminal of the operational amplifier U9A through the resistor R66. The output terminals of the operational amplifier U7A, the operational amplifier U7B, and the operational amplifier U9A are all connected to the ADC chip. The non-inverting input terminal of the operational amplifier U9A is connected to the ADC chip, and the ADC chip is connected to the processor MCU.

[0029] In the measurement module, resistors R43, R44, and R45 form the positive bridge arm, resistors R54, R55, and R56 form the negative bridge arm, and resistors R47 and R48 form the transition resistor. The circuit formed by operational amplifiers U7A and U7B uses an ADC chip to obtain the voltage across the positive bridge arm resistor. The circuit formed by operational amplifiers U7A, U9B, and U9A uses an ADC chip to obtain the voltage U across the power supply. The measured data is input into the MCU for analysis of the insulation condition to ground.

Claims

1. A train DC110V insulation monitoring device, characterized in that: It includes a processor MCU, and the processor MCU is connected to a measurement module, a communication module, a power supply module and a clock module; The measurement module is connected to the IT power distribution system via a terminal block; The communication module includes a Type-C module, a USB module and a DO module, the Type-C module is connected to the host computer, and the DO module is connected to the alarm monitoring system through a communication cable; The power supply module includes a voltage stabilizing module, a voltage step-down module and a rectifier filter which are sequentially connected to the processor MCU, and the rectifier filter is connected to the VCC terminal.

2. The train DC110V insulation monitoring device according to claim 1, characterized in that: It also includes a self-test switch, a reset switch, a display screen and a fault indicator light connected to the processor MCU.

3. The train DC110V insulation monitoring device according to claim 1, characterized in that: The measurement module includes an ADC chip, an operational amplifier U7A, an operational amplifier U7B, an operational amplifier U9A and an operational amplifier U9B, and the non-inverting input terminal of the operational amplifier U7A is connected to the resistor R42, the resistor R41 and the resistor R40 connected in series in sequence; The non-inverting input terminal of the operational amplifier U7B is connected to a first resistor string, a second resistor string, and a third resistor string connected in parallel in sequence, wherein the first resistor string includes a resistor R45, a resistor R44, and a resistor R43 connected in series in sequence, the second resistor string includes a resistor R47 and a resistor R48 connected in series in sequence, and the third resistor string includes a resistor R56, a resistor R55, and a resistor R54 connected in series in sequence, and a resistor R49, a resistor R52, and a resistor R57 connected in series are provided between the first resistor string, the second resistor string, and the third resistor string and the non-inverting input terminal of the operational amplifier U7B; the non-inverting input terminal of the operational amplifier U9B is connected to a resistor R64, a resistor R63, and a resistor R62 connected in series in sequence; The inverting input terminals of the operational amplifier U7A, operational amplifier U7B, and operational amplifier U9B are connected in parallel and connected to the output terminal of the operational amplifier U9A through resistor R66. The output terminals of the operational amplifier U7A, operational amplifier U7B, and operational amplifier U9A are all connected to the ADC chip. The non-inverting input terminal of the operational amplifier U9A is connected to the ADC chip, and the ADC chip is connected to the processor MCU.

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