阅读说明：本技术 一种机车主变压器在线监测系统及其操作方法 (Online monitoring system for main transformer of locomotive and operation method of online monitoring system ) 是由 褚衍廷 陈忠林 杨旭清 王玉昆 刘国联 王小斌 李佳 欧阳华 张范 凌慧萱 邓松 于 2020-06-10 设计创作，主要内容包括：本发明公开了一种机车主变压器在线监测系统及其操作方法,该系统包括进样控制组件、脱气控制组件、定量控制单元、振动控制组件、色谱柱、温度控制单元、气体检测模块、绝缘监测模块、数据采集模块、管路清洁控制组件、载气压力监测器、本地数据存储器、显示屏和载气提供装置。本发明还公开了一种机车主变压器在线监测系统的操作方法。本发明在机车正常运行状态下,实时监测主变压器的情况,一旦主变压器油标准数值达到临界值,及时提醒作业人员滤油或者换油。从而防止发生影响机车正常运行的事故,保证机车的安全运用。(The invention discloses an on-line monitoring system for a locomotive main transformer and an operation method thereof. The invention also discloses an operation method of the locomotive main transformer on-line monitoring system. The method monitors the condition of the main transformer in real time under the normal running state of the locomotive, and reminds operators to filter oil or change oil in time once the oil standard value of the main transformer reaches a critical value. Thereby preventing accidents affecting the normal operation of the locomotive and ensuring the safe application of the locomotive.)

1. An online monitoring system for a locomotive main transformer is characterized by comprising a sample introduction control assembly, a degassing control assembly, a quantitative control unit, a vibration control assembly, a chromatographic column, a temperature control unit, a gas detection module, an insulation monitoring module, a data acquisition module, a pipeline cleaning control assembly, a carrier gas pressure monitor, a local data memory, a display screen and a carrier gas supply device;

the sample introduction control assembly is used for sampling through an oil taking interface of a main transformer of the locomotive;

the degassing control component is used for heating and degassing the extracted sample oil, namely performing oil-gas separation treatment;

the quantitative control unit is used for quantitatively sampling the gas separated after degassing treatment and sending the gas into a chromatographic column so as to ensure that the gas amount detected each time is equal;

the chromatographic column is used for grouping the loaded gas to be detected, and the peaks are output according to the sequence of grouping arrangement when the peaks are output;

the vibration control assembly is used for performing vibration degassing treatment after the temperature in the degassing chamber reaches a set value;

the pipeline cleaning control assembly is used for evacuating the pipeline before testing, discharging residual gas and generating negative pressure in the sampling front pipe;

the temperature control unit is used for collecting temperature data through the temperature detection part to monitor the temperature when the degassing chamber and the chromatographic column heat preservation chamber are heated so as to achieve the purpose of constant temperature;

the gas detection module is used for converting gas flow into electric signal quantity when the chromatographic column is in peak, and transmitting the electric signal quantity to the microprocessor for data acquisition and analysis;

the insulation monitoring module is used for testing the dielectric strength of the transformer oil;

the data acquisition module is used for acquiring real-time data of degassing chamber temperature, chromatographic column peak waveform, locomotive main transformer insulation monitoring and carrier gas pressure;

the local data memory is used for storing the test data and dumping the data to a computer expert diagnostic system for data analysis;

the display screen is used for providing a simple human-computer operation interface and displaying the graph of the test data;

the carrier gas supply device is used for taking carrier gas as a mobile phase of gas chromatography and bringing the detected gas into the chromatographic column;

the carrier gas pressure monitor is used for tracking the carrier gas pressure, and if the carrier gas generator is adopted, the microcontroller can control the carrier gas pressure monitor to work and stop according to the working time and the pressure condition.

2. The locomotive main transformer on-line monitoring system according to claim 1, wherein the sample injection control assembly samples 150ml per time.

3. The locomotive main transformer on-line monitoring system according to claim 1, wherein the insulation monitoring module comprises two parts of test voltage generation and sampling.

4. The locomotive main transformer on-line monitoring system according to claim 1, wherein said carrier gas supply means employs a carrier gas generator and a carrier gas cylinder.

5. A method of operating a locomotive main transformer on-line monitoring system according to claim 1, comprising the steps of:

firstly, transformer oil sampling is carried out on a main transformer of the locomotive, efficient oil-gas separation is realized on sample oil by adopting a vibration degassing method, separated gas is brought into a chromatographic column by inert gas in a quantitative pipe, then the gas is subjected to component separation in the chromatographic column, and finally the gas is sent to a gas detection module for detection.

6. The method of claim 5, wherein after each test is completed, the system stores and displays the test data and dumps the historical data to the computer expert diagnostic system for data analysis.

Technical Field

The invention belongs to the technical field of electronics, and relates to an online monitoring system for a locomotive main transformer and an operation method thereof, in particular to an online monitoring system for a locomotive main transformer and an operation method thereof.

Background

The main transformer of the electric locomotive is an important part on the alternating current electric locomotive, is called as the heart of the electric locomotive, the importance of the main transformer is very important, and the reliability and the continuity of the operation of the main transformer are powerful guarantees of the locomotive running safety.

The main transformer of the electric locomotive has relatively severe operating conditions, compared with a common civil power transformer, the main transformer of the electric locomotive has high short-circuit impedance and large network voltage fluctuation (about 10 kV), higher harmonics exist in the current of a traction winding (a low-voltage winding), and the main transformer of the electric locomotive works in the environment with large temperature difference, continuous vibration, frequent start and stop and frequent load change for a long time, so that some potential small faults are likely to be developed into catastrophic accidents in the severe environment, thereby influencing the driving safety and causing great loss.

At present, maintenance and repair measures for a main transformer of a locomotive mainly aim at repair off-line diagnosis, transformer oil samples are manually extracted in an off-line diagnosis mode and sent to a laboratory for analysis of content of dissolved gas in oil, potential fault factors cannot be found in time in the off-line diagnosis mode, working efficiency is low, and the on-line monitoring technology research on the main transformer of the locomotive is conducted by combining the above analysis.

The locomotive main transformer is mounted in the middle of the bottom of the locomotive in a hanging mode, and a primary voltage (25 KV) is connected to the main transformer through a high-voltage electric appliance cabinet by a pantograph through a high-voltage cable. The main transformer adopts oil cooling and has the protection functions of temperature, oil flow, pressure, a Buch-Hertz relay and the like.

At present, the main transformer oil of the locomotive needs to be detected in the spring identification process and when the main transformer is abnormal, and the process of indoor chemical examination by extracting an oil sample is complex. When an oil sample is taken, a protective plate of a traveling part of the main transformer needs to be opened, a valve of an oil tank of the main transformer is unscrewed, and the valve has the hidden trouble of poor sealing after being opened and closed for many times. In order to find out the oil abnormality of the main transformer in the running process of the locomotive in time, prevent the occurrence of accidents and ensure the driving safety, an online monitoring system of the main transformer of the locomotive and an operation method thereof need to be developed.

Disclosure of Invention

The invention aims to provide an on-line monitoring system for a locomotive main transformer and an operation method thereof.

The specific technical scheme is as follows:

an online monitoring system for a locomotive main transformer comprises a sample introduction control assembly, a degassing control assembly, a quantitative control unit, a vibration control assembly, a chromatographic column, a temperature control unit, a gas detection module, an insulation monitoring module, a data acquisition module, a pipeline cleaning control assembly, a carrier gas pressure monitor, a local data memory, a display screen and a carrier gas supply device;

and the sampling control assembly is used for sampling through an oil taking interface of a main transformer of the locomotive.

The degassing control assembly is used for heating and degassing the extracted sample oil, namely performing oil-gas separation treatment.

The quantitative control unit is used for quantitatively sampling the gas separated after degassing treatment and sending the gas into a chromatographic column so as to ensure that the gas amount detected each time is equal.

The chromatographic column is used for grouping the loaded gas to be detected, and peaks appear according to the sequence of grouping arrangement when the peaks appear.

The vibration control assembly is used for performing vibration degassing treatment after the temperature in the degassing chamber reaches a set value.

The pipeline cleaning control assembly is used for evacuating the pipeline before testing, discharging residual gas and generating negative pressure in the sampling front pipe.

The temperature control unit is used for monitoring the temperature by collecting temperature data through the temperature detection part when heating the degassing chamber and the chromatographic column heat preservation chamber so as to achieve the purpose of constant temperature.

The gas detection module is used for converting gas flow into electric signal quantity when the chromatographic column is in peak discharge and transmitting the electric signal quantity to the microprocessor for data acquisition and analysis.

The insulation monitoring module is used for testing the dielectric strength (insulation strength) of the transformer oil.

The data acquisition module is used for carrying out real-time data acquisition on degassing chamber temperature, chromatographic column peak waveform, locomotive main transformer insulation monitoring, carrier gas pressure and the like.

The local data storage is used for storing the test data and can dump the data to a computer expert diagnostic system for data analysis.

The display screen is used for providing a simple human-computer operation interface and displaying the test data in a graphic mode.

The carrier gas supply device is used for taking the carrier gas as a mobile phase of the gas chromatography and bringing the detected gas into the chromatographic column.

The carrier gas pressure monitor is used for tracking the carrier gas pressure, and if the carrier gas generator is adopted, the microcontroller can control the carrier gas pressure monitor to work and stop according to the working time and the pressure condition.

Further, the sampling amount of each sampling of the sampling control component is 150 ml.

Further, the insulation monitoring module comprises a test voltage generation part and a sampling part.

Further, the carrier gas supply device adopts a carrier gas generator and a carrier gas bottle.

An operation method of an online monitoring system of a locomotive main transformer comprises the following steps:

firstly, transformer oil sampling is carried out on a main transformer of the locomotive, efficient oil-gas separation is realized on sample oil by adopting a vibration degassing method, separated gas is brought into a chromatographic column by inert gas (namely carrier gas) in a quantitative pipe, then the gas is subjected to component separation in the chromatographic column, and finally the gas is sent to a gas detection module for detection.

Furthermore, after each test is finished, the system stores and displays the test data, and historical data can be dumped to a computer expert diagnostic system for data analysis.

Has the advantages that:

the invention discloses an on-line monitoring system of a main transformer of a locomotive, which is professional monitoring equipment developed by automatically and intelligently detecting the insulation performance of oil and the main transformer of the locomotive. The locomotive main transformer on-line monitoring system adopts intelligent whole-course automatic periodic detection, does not need manual operation, automatically stores the tested data to the local for the user to inquire and track, and enables the user to timely hold the running condition of the locomotive main transformer and the historical change curve of the performance. Under the normal running state of the locomotive, the condition of the main transformer is monitored in real time, and once the oil standard value of the main transformer reaches a critical value, operators are reminded to filter oil or change oil in time. Thereby preventing accidents affecting the normal operation of the locomotive and ensuring the safe application of the locomotive.

Drawings

FIG. 1 is a schematic diagram of an on-line monitoring system for a main transformer of a locomotive according to the present invention;

FIG. 2 is a flow chart of an on-line monitoring system for a main transformer of a locomotive according to the present invention;

FIG. 3 is a main interface;

FIG. 4 is a function menu interface;

FIG. 5 is a system date and time setting interface;

FIG. 6 is an appointment setup interface;

FIG. 7 is a network settings interface;

FIG. 8 is a manual control interface;

FIG. 9 is a software flow chart of the on-line monitoring system of the main transformer of the locomotive according to the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the on-line monitoring system for the main transformer of the locomotive comprises a sample injection control assembly, a degassing control assembly, a quantitative control unit, a vibration control assembly, a chromatographic column, a temperature control unit, a gas detection module, an insulation monitoring module, a pipeline cleaning control assembly, a carrier gas pressure monitor, a local data memory, a display screen, a carrier gas supply device and the like.

A sample introduction control assembly: sampling is carried out through an oil taking interface of a main transformer of the locomotive, and the sampling quantity is 150ml each time.

A degassing control component: and (4) heating and degassing the extracted sample oil, namely performing oil-gas separation treatment.

A quantitative control unit: and quantitatively sampling the gas separated after the degassing treatment, and sending the gas into a chromatographic column to ensure that the gas amount detected each time is equal.

A chromatographic column: and grouping the loaded detected gas, and carrying out peak output according to the sequence of grouping arrangement when the peak output is carried out.

A vibration control assembly: and performing vibration degassing treatment after the temperature in the degassing chamber reaches a set value.

Pipeline cleaning control assembly: the method is mainly used for evacuating the pipeline before testing, discharging residual gas and generating negative pressure in a sample injection front pipe.

A temperature control unit: when the degassing chamber and the chromatographic column heat preservation chamber are heated, temperature data are collected through the temperature detection part to carry out temperature monitoring, so that the purpose of keeping the temperature constant is achieved.

A gas detection module: when the chromatographic column is in peak, the gas flow is converted into electric signal quantity, and the electric signal quantity is transmitted to a microprocessor for data acquisition and analysis.

An insulation monitoring module: the module comprises a test voltage generation part and a sampling part and is mainly used for testing the dielectric strength (insulation strength) of the transformer oil.

Data acquisition: the method is mainly used for carrying out real-time data acquisition on degassing chamber temperature, chromatographic column peak waveform, locomotive main transformer insulation monitoring, carrier gas pressure and the like.

And the local data storage is used for storing the test data and dumping the data to the computer expert diagnostic system for data analysis. The computer expert diagnosis system is an upper computer system and mainly analyzes the tested data to judge the current transformer oil condition, and meanwhile, whether the transformer has faults or not can be judged according to the quantity of certain gases, such as acetylene generated by high-voltage discharge in the transformer. Meanwhile, the system also stores all the detected transformer data to obtain a historical change curve.

A display screen: provides a simple human-computer operation interface and the graphic display of the test data.

A carrier gas supply device: a carrier gas generator and a carrier gas cylinder can be selected. The carrier gas is mainly used as a mobile phase of the gas chromatography and carries the gas to be detected into the chromatographic column.

Carrier gas pressure monitor: the pressure of the carrier gas is tracked, and if the generator is a carrier gas generator, the microcontroller controls the operation and the stop of the generator according to the working time and the pressure condition.

The chromatographic column is a stainless steel tube with the diameter of 3 mm and the length of 3 m, the solid adsorbent is filled in the chromatographic column, and the filled adsorbent is called as a stationary phase. Also a mobile phase (i.e. carrier gas) is associated with the stationary phase. The gas to be measured is carried into the column in the dosing ring by the carrier gas, the stationary phase having a different affinity with the gases of the various components of the gas to be measured. When the carrier gas carries the gas to be measured to continuously pass through the chromatographic column, the gas with high affinity with the stationary phase moves slowly in the chromatographic column, and the gas with low affinity moves quickly, so that the components of the gas to be measured are realized. The gas after the components sequentially flows through the detector according to the peak-appearing time sequence, and the content data of the gas of each component is obtained through the detection of the detector. The quantitative ring is a ring-shaped stainless steel pipe. The amount required for each test was calculated to determine the quantitative loop length. If the length of the quantitative ring is 20 cm and the inner diameter is 3 mm, the volume of the contained gas can be obtained after the volume is calculated.

In the specific application process of the on-line monitoring system for the locomotive main transformer, the working process is shown in fig. 2, firstly, transformer oil sampling is carried out on the locomotive main transformer, then, the sample oil is subjected to efficient oil-gas separation by adopting a vibration degassing method, the separated gas is brought into a chromatographic column by inert gas (namely carrier gas) in a quantitative pipe, then, the gas is subjected to component separation in the chromatographic column, and finally, the gas is sent to a gas detection module for detection. After each test is finished, the system stores and displays the test data, and historical data can be dumped to a computer expert diagnostic system for data analysis.

The operation of the locomotive main transformer on-line monitoring system of the invention is explained as follows:

1. instructions for use of the device

The equipment adopts intelligent design, and can normally work without other operations only by simply setting the equipment in the host system when in use. The specific operation is as follows:

the correct system date and time is set.

And setting the reserved test time.

After the appointment time is set, the equipment automatically carries out periodic test according to the appointment time, and the test result is stored in the SD card; the user can copy the test data from the SD card to the computer data analysis system periodically for test data analysis and backup.

2. System function menu and operation introduction thereof

After the host computer is started, the screen automatically enters a main interface (test interface) shown in fig. 3, the function menu interface shown in fig. 4 can be entered by clicking the arrow button at the upper left corner, and then relevant setting can be carried out according to options in the menu.

2.1 System date time setting

Clicking a system time icon in a function menu option to enter a system date and time setting interface shown in FIG. 5, for example, setting a year share; clicking the year input box first, displaying the year at the bottom of the interface, which shows that the current input focus is switched into the year input box, if the input focus is changed, clicking the 'clear' key of the lower numeric keyboard to clear the original number, and then clicking the corresponding numeric key of the lower numeric keyboard to input the year according to the current year. The year only needs to input two digits, for example, in 2019, only needs to input '19' two digits. The time, minute, second and week of the following month, day and week are all input or modified according to the method. After the modification or setting is finished, a 'save' button is pressed, a 'setting success' prompt is displayed at the bottom, and then the upper left corner is clicked to return to the function menu for other operations and settings.

The system date and time must be set correctly, and since the date and time noted later in the stored test data, the scheduled test described later, and the like are performed with reference to the system date and time, it is important to set the correct date and time.

2.2 reservation function settings

Clicking the "test period" icon in the function menu option may enter the appointment setup interface shown in fig. 6. The test period settings support "monthly", "weekly", and "daily". For example, if the user needs to automatically test the device once every month, the user firstly selects the 'monthly' radio box, then respectively inputs the date, time and minute according to the operation method described above, presses the 'save' button after inputting the date and time of the appointment, and then displays the 'setting success' prompt on the upper right corner.

After the user sets the reservation function, the system can automatically test according to the set reservation time.

2.3 network setup

If the user has customized the network function, the "network settings" icon may be clicked on the function menu to enter the network settings interface shown in FIG. 7. The IP address, port number, etc. in the interface can be operated according to the above-described setting and modifying method.

The network function can realize automatic network timing and automatic uploading of test data to a user-specified server.

2.4 Manual control

When the user needs to manually control the maintenance and overhaul of the equipment, the user can click the manual control icon in the function menu option to enter the manual control operation interface shown in fig. 8, and the expected operation can be completed through combination.

2.5 immediate testing

When a user needs to carry out field detection on the main transformer of the locomotive, the 'automatic test' icon can be clicked in the function menu, and the system immediately starts the automatic test process.

2.6 parameter settings

And making system reservation.

The software flow diagram is shown in fig. 9, the program execution starts, the equipment self-check is performed after the power-on of the starting machine, and the equipment circuit conduction condition, the sensor, the gas circuit valve and the oil circuit valve self-check are mainly performed; judging whether the system time is consistent with the set time, if not, continuing to wait, if so, starting the test, simultaneously starting temperature monitoring, and monitoring the temperatures of the degassing chamber and the chromatographic column so as to realize constant temperature of the degassing chamber and the chromatographic column; before testing, the equipment performs self-checking, and mainly checks the circuit conduction condition of the equipment, the sensor, the gas circuit valve and the oil circuit valve again to confirm the working state; the oil cylinder is pulled by controlling the electric push rod to generate negative pressure in the degassing chamber, and oil feeding is controlled by alternately conducting the oil inlet control valve and the oil outlet control valve, so that automatic sampling is realized. Carrying out insulation detection on the dielectric strength (insulation strength) of the transformer oil, and transmitting the acquired result to a processor for displaying and analyzing; after the degassing chamber is filled with transformer oil, closing the oil inlet control valve and the oil outlet control valve to start heating the degassing chamber, and starting to pump back and forth by using an electric push rod to realize high-temperature vibration degassing after the oil temperature is kept at 80 ℃ through temperature monitoring; after degassing is finished, an air pump is started to evacuate the pipeline, the chromatographic column is kept at a constant temperature of 70 ℃ through temperature monitoring, an air inlet valve is opened to enable the desorbed gas to flow into a quantitative ring, and then the air inlet valve is closed. And rotating the six-way valve, adjusting the air pressure fine adjustment valve, leading the gas to be detected in the quantitative ring to be brought into the chromatographic column by the carrier gas, and carrying out composition on the gas to be detected in the chromatographic column. When the chromatographic column is in peak discharge, the detector is started to collect component gas peak discharge data, the gas flow is converted into electric signal quantity, the electric signal quantity is transmitted to the microprocessor for data graphic display, then data analysis and calculation are carried out, and the detection result is output. The system stores and displays the test data in real time, and historical data can be dumped to a computer expert diagnostic system for data analysis. And finally, cleaning the chromatographic column, and closing the heating device and the gas-carrying control valve. And (6) completing the test.

Regarding the real-time performance of the system, for the detection of the transformer oil, the detection once a week greatly exceeds the frequency of off-line detection, and certainly, the detection can be performed once a day or even multiple times a day when needed, and the detection can be set as required according to actual needs. The time required for one test is about one hour.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.