CN104849631A - Locomotive roof insulation testing system - Google Patents

Abstract

The invention discloses a locomotive roof insulation test system, which comprises a power supply control module (1), a high voltage generation module (2), a test interface module (3), a test condition signal input module (4), an MCU module (5), Man-machine interface module (6) and data communication module (7); when using the system for testing, the next step can only be performed if the test condition signal is detected to be in the correct state. When the conditions are met and the necessary tester information is input, Press the test button to test the insulation resistance. After the test is completed, the detected insulation resistance value will be displayed on the LCD, and the test conclusion whether the insulation resistance of the roof is qualified or not will be given; each step of the test process will have a voice prompt for the status or the next operation method. The invention provides a convenient means for testing the insulation resistance of the roof of the locomotive, and enhances the safety operation management of the locomotive.

Description

A Locomotive Roof Insulation Testing System

technical field

The invention relates to the field of insulation resistance testing, in particular to a locomotive roof insulation testing system.

Background technique

The high-voltage equipment on the roof of the electric locomotive is installed outdoors, and its insulation is easily affected by the external environment. In order to ensure the safety of the locomotive, it is necessary to regularly or inspect the insulation condition of the roof.

There are two main methods for existing roof insulation testing. One method is to use a megohmmeter to test the roof by the operator. Although this method is direct, it is not convenient enough. Hidden danger. Another way is to install a special test equipment in the locomotive to realize the detection of the insulation of the roof. This equipment inverts the DC110V power supply of the locomotive into AC100V and sends it to the secondary side of the high-voltage transformer, so that the primary side of the transformer A high voltage of AC25KV is generated, and the testers judge the insulation state of the locomotive roof according to the voltage display of the cab voltmeter. Although this method is more convenient and safe, it cannot give an accurate and quantified insulation resistance value. At the same time, the above two methods do not have the automatic recording function of the tester's identity information and test results, and do not have the management function, leaving loopholes for security management.

Contents of the invention

The invention provides a locomotive roof insulation test system, which overcomes the deficiencies of the existing test system in terms of safety, test accuracy and management functions through the design scheme of modular hardware and standardized operation process.

The technical scheme adopted by the present invention is a locomotive roof insulation test system, including a power control module (1), a high voltage generation module (2), a test interface module (3), a test condition signal input module (4), and an MCU module (5), man-machine interface module (6) and data communication module (7); It is characterized in that, described power supply control module (1) input end connects locomotive DC110V power supply, output end and the input end of high voltage generation module (2) Connection, the control signal input terminal of the power control module (1) is connected with the input and output port P1.0 of the MCU module (5); the output terminal of the high voltage generation module (2) is connected with the input terminal of the test interface module (3) , the signal detection and control terminals of the high-voltage generation module (2) are respectively connected with the AD1 port and the PWM1 port of the MCU module (5); the test interface module (3) is installed in the roof insulator, and its output terminal is connected to the measured object connected, the control input of the test interface module (3) is connected with the input and output port P1.1 of the MCU module (5); the signal input of the test condition signal input module (4) is connected with 8 road condition input signal lead-out lines , multi-channel conditional input signals include pantograph lowering signal, roof door closing signal, driver key signal, main circuit breaker disconnection signal and 4-way backup input signal, the conditional signal input module (4) corresponds to 8-way conditional input signal There are 8 level setting switches, which are used to uniformly convert the conditional input signals into 8 high-level outputs, and the 8 output signals are connected to the input and output ports P1.2 of the MCU module (5) through the output terminals of the AND gate circuit .

The invention relates to a locomotive roof insulation testing system, the working flow of which includes the following steps.

S1: Turn on the power switch, power on the system for initialization, the input and output port P1.0 of the MCU module (5) outputs a low level, so that the power control module (1) has no output, and the PWM1 port of the MCU module (5) blocks the output , so that the high-voltage generating module (2) has no high-voltage output, and enters step S2.

S2: The MCU module (5) detects the level of the input and output ports of P1.2, and judges whether the output signals of the test condition signal input module (4) are all high level, if not high level, the man-machine interface module (6) gives A voice prompt of "does not meet the test conditions" is issued, waiting for the test conditions to be ready, and if the level is high, enter step S3.

S3: The test condition ready light of the man-machine interface module (6) is on, waiting for the input of the tester number, if the MCU module (5) does not detect the input completion signal of the man-machine interface module (6), the man-machine interface module (6) Every 10 seconds, the voice prompts "Please input the tester's number", and if the input is completed, go to step S4.

S4: The MCU module (5) matches the input tester number, if it is an illegal number, the man-machine interface module (6) gives a voice prompt "The tester number is incorrect, please re-enter", and returns to step S2, if the input If the number is correct, go to step S5.

S5: If the MCU module (5) does not detect the start test signal of the man-machine interface module (6), the man-machine interface module (6) will voice prompt "Please press the test button to test" every 10 seconds. Press the key to input a signal and go to step S6.

S6: The man-machine interface module (6) gives a voice prompt "please wait for the test to be completed", the input and output port P1.1 of the MCU module (5) outputs a high level, the test interface module (3) is connected to the object under test, and the MCU The input and output port P1.0 of the module (5) outputs a high level, so that the output terminal of the power control module (1) outputs power to the high voltage generation module (2), and enters step S7.

S7: The PWM1 port of the MCU module (5) outputs a PWM signal, controls the high voltage generation module (2) to output high voltage to the test interface module (3), the MCU module (5) collects the current sensing signal through the AD1 port, and the MCU module (5) Calculate the insulation resistance value of the measured object, and proceed to step S8 after the calculation is completed.

S8: The MCU module (5) compares the calculated insulation resistance value with the preset insulation resistance qualified value, and if the calculated insulation resistance value is greater than the qualified value, the man-machine interface module (6) gives a voice prompt "test completed, Insulation is normal", otherwise it will give a voice prompt of "test completed, insulation is abnormal"; at the same time, the human-machine interface module (6) will display the tested insulation resistance value and "insulation normal" or "insulation abnormal" through the LCD, enter Step S9.

S9: the PWM1 port of the MCU module (5) blocks the PWM signal, stops the high voltage generating module (2) from outputting high voltage, and proceeds to step S10.

S10: the MCU module (5) saves the test result, and proceeds to step S11.

S11: Delay for 60 seconds, the man-machine interface module (6) gives a voice prompt "Press the test button for re-testing", if the signal of pressing the test button is detected during the delay period, return to step S5, and press the power button during the delay period Or when the delay is over, go to step S12.

S12: the input and output port P1.1 of the MCU module (5) outputs a low level, so that the test interface module (3) is disconnected from the measured object, and the input and output port P1.0 of the MCU module (5) outputs a low level, The output terminal of the power control module (1) is disconnected from the power supply of the test interface module (3), the test condition ready light is off, and the system exits the test ready state.

Description of drawings

Fig. 1 is a structural diagram of a locomotive roof insulation testing system according to the present invention.

Fig. 2 is a working flow chart of a locomotive roof insulation testing system according to the present invention.

Detailed ways

In view of the safety, test accuracy and management functions of the locomotive roof insulation test, the present invention provides a locomotive roof insulation test system. The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

A locomotive roof insulation test system, comprising a power supply control module (1), a high voltage generation module (2), a test interface module (3), a test condition signal input module (4), an MCU module (5), and a man-machine interface module (6) and data communication module (7); It is characterized in that, described power supply control module (1) input terminal is connected locomotive DC110V power supply, and output terminal is connected with the input terminal of high voltage generation module (2), and power supply control module (1) The control signal input end of the control signal is connected with the input and output port P1.0 of the MCU module (5); the output end of the high voltage generation module (2) is connected with the input end of the test interface module (3), and the high voltage generation module (2) The signal detection and control terminals are respectively connected with the AD1 port and the PWM1 port of the MCU module (5); the test interface module (3) is installed in the roof insulator, and its output terminal is connected with the object under test, and the test interface module (3) The control input end of the control input is connected with the input and output port P1.1 of the MCU module (5); the signal input end of the test condition signal input module (4) is connected with 8 road condition input signal lead-out lines, and the multi-way condition input signal includes the subject Pantograph lowering signal, roof door closing signal, driver key signal, main circuit breaker disconnection signal and 4 backup input signals, the conditional signal input module (4) has 8 level settings corresponding to the 8 conditional input signals The switch is used to uniformly convert the conditional input signals into 8 high-level outputs, and the 8 output signals are connected to the input and output ports P1.2 of the MCU module (5) through the output terminals of the AND gate circuit.

The high-voltage generation module (2) adopts a single-ended flyback converter topology, and controls the conduction time of the circuit switching device through the PWM1 port of the MCU module (5), thereby stably outputting the voltage.

The core part of the test interface module (3) is a G64-A741 high voltage relay.

The data communication module (7) of the present invention comprises RS232/485 serial interface and USB interface, and RS232/485 realizes that test record data is uploaded to upper computer, and USB interface can save the test record preserved in the device in the U disk.

The invention relates to a locomotive roof insulation testing system, the working flow of which includes the following steps.

S1: Turn on the power switch, power on the system for initialization, the input and output port P1.0 of the MCU module (5) outputs a low level, so that the power control module (1) has no output, and the PWM1 port of the MCU module (5) blocks the output , so that the high-voltage generating module (2) has no high-voltage output, and enters step S2.

S2: The MCU module (5) detects the level of the input and output ports of P1.2, and judges whether the output signals of the test condition signal input module (4) are all high level, if not high level, the man-machine interface module (6) gives A voice prompt of "does not meet the test conditions" is issued, and the test conditions are ready, and if the level is high, enter step S3.

S3: The test condition ready light of the man-machine interface module (6) is on, waiting for the input of the tester number, if the MCU module (5) does not detect the input completion signal of the man-machine interface module (6), the man-machine interface module (6) Every 10 seconds, the voice prompts "Please input the tester's number", and if the input is completed, go to step S4.

S4: The MCU module (5) matches the input tester number, if it is an illegal number, the man-machine interface module (6) gives a voice prompt "The tester number is incorrect, please re-enter", and returns to step S2, if the input If the number is correct, go to step S5.

S5: If the MCU module (5) does not detect the start test signal of the man-machine interface module (6), the man-machine interface module (6) will voice prompt "Please press the test button to test" every 10 seconds. Press the key to input a signal and go to step S6.

S6: The man-machine interface module (6) gives a voice prompt "please wait for the test to be completed", the input and output port P1.1 of the MCU module (5) outputs a high level, the test interface module (3) is connected to the object under test, and the MCU The input and output port P1.0 of the module (5) outputs a high level, so that the output terminal of the power control module (1) outputs power to the high voltage generation module (2), and enters step S7.

S7: The PWM1 port of the MCU module (5) outputs a PWM signal, controls the high voltage generation module (2) to output high voltage to the test interface module (3), the MCU module (5) collects the current sensing signal through the AD1 port, and the MCU module (5) Calculate the insulation resistance value of the measured object, and proceed to step S8 after the calculation is completed.

S8: The MCU module (5) compares the calculated insulation resistance value with the preset insulation resistance qualified value, and if the calculated insulation resistance value is greater than the qualified value, the man-machine interface module (6) gives a voice prompt "test completed, Insulation is normal", otherwise it will give a voice prompt of "test completed, insulation is abnormal"; at the same time, the human-machine interface module (6) will display the tested insulation resistance value and "insulation normal" or "insulation abnormal" through the LCD, enter Step S9.

S9: the PWM1 port of the MCU module (5) blocks the PWM signal, stops the high voltage generating module (2) from outputting high voltage, and proceeds to step S10.

S10: the MCU module (5) saves the test result, and proceeds to step S11.

S11: Delay for 60 seconds, the man-machine interface module (6) gives a voice prompt "Press the test button for re-testing", if the signal of pressing the test button is detected during the delay period, return to step S5, and press the power button during the delay period Or when the delay is over, go to step S12.

S12: the input and output port P1.1 of the MCU module (5) outputs a low level, so that the test interface module (3) is disconnected from the measured object, and the input and output port P1.0 of the MCU module (5) outputs a low level, The output terminal of the power control module (1) is disconnected from the power supply of the test interface module (3), the test condition ready light is off, and the system exits the test ready state.

The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. If various changes or modifications are made to the embodiments of the present invention, but they are still within the spirit and principles of the present invention, they should be included in the scope of the present invention. within the scope of the claims.

Claims (2)

1. a locomotive roof insulation testing system, comprises energy supply control module (1), high pressure generation module (2), test interface module (3), test condition signal input module (4), MCU module (5), human-machine interface module (6) and data communication module (7), it is characterized in that, described energy supply control module (1) input end connects locomotive DC110V power supply, output terminal is connected with the input end of high pressure generation module (2), and the control signal input end of energy supply control module (1) is connected with the input/output port P1.0 of MCU module (5), the output terminal of described high pressure generation module (2) is connected with the input end of test interface module (3), and the input of high pressure generation module (2) and control end are connected with the AD1 port of MCU module (5) and PWM1 port respectively, described test interface module (3) is installed in top insulation, and its output terminal is connected with measurand, and the control input end of test interface module (3) is connected with the input/output port P1.1 of MCU module (5), the signal input part of described test condition signal input module (4) is connected with 8 travel permit part input signal extension lines, multichannel condition entry signal comprises pantograph and falls bow signal, top door closure signal, driver's key signal, main circuit breaker cut-off signal and 4 road spare input signals, the corresponding 8 travel permit part input signals of conditioned signal load module (4) are provided with 8 level configuration switchs, for being converted to 8 road high level outputs by unified for condition entry signal, 8 tunnel output signals are connected by the input/output port P1.2 of AND circuit output terminal with MCU module (5).

2. a kind of locomotive roof insulation testing system according to claim 1, it is characterized in that, the workflow of this system comprises the steps:

S1: switch on power switch, system electrification carries out initialization, the input/output port P1.0 output low level of MCU module (5), make energy supply control module (1) no-output, the PWM1 port locking of MCU module (5) exports, make high pressure generation module (2) without High voltage output, enter step S2;

S2:MCU module (5) detects P1.2 input/output port level, judge whether the output signal of test condition signal input module (4) is high level, if not high level then human-machine interface module (6) provide the voice message of " not possessing test condition ", wait test condition is ready, if high level then enters step S3;

S3: the ready lamp of test condition of human-machine interface module (6) is bright, wait for input test person number, if MCU module (5) does not detect the input settling signal of human-machine interface module (6), then human-machine interface module (6) " asks input test person number " every voice message in 10 seconds, if complete input, enters step S4;

The tester numbering of S4:MCU module (5) to input is mated, if illegally number, then human-machine interface module (6) provides voice message " tester numbers incorrect; please re-enter ", return step S2, if input numbering is correct, then enter step S5;

S5: if MCU module (5) does not detect the beginning test signal of human-machine interface module (6), then human-machine interface module (6) " is please tested by test button " every voice message in 10 seconds, if test key-press input signal detected, enter step S6;

S6: human-machine interface module (6) provides voice message " please wait for that test completes ", the input/output port P1.1 of MCU module (5) exports high level, test interface module (3) connects measurand, the input/output port P1.0 of MCU module (5) exports high level, make energy supply control module (1) output terminal out-put supply to high pressure generation module (2), enter step S7;

The PWM1 port output pwm signal of S7:MCU module (5), control high pressure generation module (2) and export high pressure to test interface module (3), MCU module (5) is by AD1 port processing current sensing signal, MCU module (5) calculates the insulating resistance value of measurand, has calculated and has entered step S8;

The insulating resistance value of calculating and the insulation resistance acceptance value preset compare by S8:MCU module (5), if the insulating resistance value calculated is greater than acceptance value, then human-machine interface module (6) provides voice message " test completes; insulation is normal ", otherwise provide the voice message of " test completes, Abnormal Insulation "; Meanwhile, human-machine interface module (6) provides the insulating resistance value of test and the display of " insulation is normal " or " Abnormal Insulation " by LCD, enters step S9;

The PWM1 port locking pwm signal of S9:MCU module (5), stops high pressure generation module (2) to export high pressure, enters step S10;

Test result is preserved by S10:MCU module (5), enters step S11;

S11: time delay 60 seconds, human-machine interface module (6) provides voice message and " retests please by test button ", if detect between time delay, test button presses signal, returns step S5, press power button between time delay or time delay terminates, enter step S12;

The input/output port P1.1 output low level of S12:MCU module (5), test interface module (3) and measurand are disconnected, the input/output port P1.0 output low level of MCU module (5), energy supply control module (1) output terminal is made to disconnect test interface module (3) power supply, the ready lamp of test condition goes out, and system exits test ready state.