CN220932225U - Main transformer oil temperature thermometer verification system based on PLC control - Google Patents
Main transformer oil temperature thermometer verification system based on PLC control Download PDFInfo
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- CN220932225U CN220932225U CN202322760093.5U CN202322760093U CN220932225U CN 220932225 U CN220932225 U CN 220932225U CN 202322760093 U CN202322760093 U CN 202322760093U CN 220932225 U CN220932225 U CN 220932225U
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- 238000012795 verification Methods 0.000 title claims abstract description 43
- 238000012545 processing Methods 0.000 claims abstract description 22
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- 238000002955 isolation Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
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- 239000000523 sample Substances 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of oil immersed transformer oil thermometer verification systems, in particular to a main transformer oil thermometer verification system based on PLC control, which comprises a hollow body, a power module arranged in the body and a PLC central processing module, wherein the PLC central processing module is electrically connected with the power module, a voltage output interface connected with an oil thermometer power supply through a circuit, a switching value input interface connected with an oil thermometer action switching value contact through the circuit, and an analog value input interface connected with an oil thermometer temperature analog value output end through the circuit are arranged on the outer side of the body, the switching value input interface is electrically connected with the power module, and the switching value input interface and the analog value input interface are electrically connected with the PLC central processing module. The system can be connected with a plurality of pairs of oil thermometer action switching value contacts simultaneously, and the plurality of pairs of oil thermometer action switching value contacts are checked simultaneously, so that timely and accurate measurement is realized, and the checking efficiency and the checking accuracy are improved.
Description
Technical Field
The utility model relates to the technical field of oil immersed transformer oil thermometer verification systems, in particular to a main transformer oil temperature thermometer verification system based on PLC control.
Background
The oil thermometer is an important temperature measuring element of the oil immersed power transformer, and is also a logic discriminating element of a transformer cooling control system loop, and is used for monitoring the running temperature of the transformer and participating in the logic control of the cooling transformer. When the running temperature of the transformer exceeds a set value, the cooling control device starts the cooler to cool the transformer, so that the transformer runs in an allowable temperature range, and meanwhile, an alarm signal is sent out to make the operation and maintenance personnel pay attention. According to the specification of DL/T1400-2015 on-site calibration standards of temperature measuring devices of oil-immersed transformers, the verification period of the temperature measuring devices of the oil-immersed transformers is generally not more than 6 years, so that the period verification of the oil-immersed transformer oil thermometer is particularly important.
At present, the oil thermometer verification mode adopts a traditional verification mode, namely, after the oil thermometer is detached from a transformer, the oil thermometer is verified by a traditional automatic temperature verification system, wherein the traditional automatic temperature verification system consists of a constant-temperature oil groove verification furnace 2, a temperature control sensor 5, a temperature control instrument 6, a low-thermal-potential multi-path data acquisition device 7, a computer 8, a printer 9, a thermocouple cable 10 and the like, and when the oil thermometer is verified, a temperature sensing probe of the oil thermometer is placed into an oil groove of the constant-temperature oil groove verification furnace to be heated, and the computer is communicated with the low-thermal-potential multi-path data acquisition device and the temperature control instrument under the control of software; the computer is connected with the temperature controller and is used for collecting signals of the temperature control sensor, judging whether the temperature in the constant-temperature oil groove verification furnace is near the set temperature, and controlling the constant-temperature oil groove to be near the set temperature by the temperature controller if the temperature does not meet the set temperature; for checking the switching value and the contact point of the oil thermometer, the conventional method adopts the universal meter 4 to measure four pairs of switching values and four pairs of contact points of the oil thermometer one by one, when the temperature reaches the contact point action value, the contact point is conducted, and the contact point action temperature is recorded and compared with the fixed value. When the traditional verification mode is used for verifying four pairs of switching value contacts of the oil thermometer in actual application, a universal meter is used for testing whether each temperature action contact is connected one by one under different temperature values; if the measurement time is missed due to the error of the measurement contact or when the temperature reaches the set value during the temperature rising period, the verification efficiency and the verification accuracy will be affected.
Therefore, there is a need for a verification system that improves the accuracy and efficiency of the oil thermometer verification.
Disclosure of utility model
The utility model aims to provide a main transformer oil temperature thermometer verification system based on PLC control, which can be connected with a plurality of pairs of oil thermometer action switching value contacts simultaneously to verify the plurality of pairs of oil thermometer action switching value contacts simultaneously, and solves the problems that a universal meter is adopted to measure one by one in the traditional verification process, and the verification efficiency and the verification accuracy are affected due to untimely measurement or contact error measurement.
The embodiment of the utility model is realized by the following technical scheme: the utility model provides a main transformer oil temperature thermometer check-up system based on PLC control, includes inside hollow body and locates inside power module and the PLC central processing module of body, PLC central processing module is connected with the power module electricity, the body outside is equipped with the voltage output interface that passes through the line connection with oil thermometer power supply, the analog input interface that passes through the line connection with oil thermometer action switching value contact and oil thermometer temperature analog output through the switching value input interface of line connection with oil thermometer action switching value contact, switching value input interface and power module electricity are connected, switching value input interface, analog input interface all are connected with the PLC central processing module electricity.
According to a preferred embodiment, the oil thermometer further comprises an analog quantity isolation device, wherein the input end of the analog quantity isolation device is connected with the analog quantity output end of the oil thermometer through a circuit, the first output end of the analog quantity isolation device is connected to the analog quantity input interface, and the second output end of the analog quantity isolation device is connected to the monitoring system.
According to a preferred embodiment, the device further comprises a display screen, wherein the display screen is electrically connected with the PLC central processing module.
According to a preferred embodiment, a communication network port connected with the display screen through a line is arranged on the outer side of the body, and the communication network port is electrically connected with the PLC central processing module.
According to a preferred embodiment, the switching value input interface, the analog value input interface and the communication network port are arranged on the same side of the body.
The technical scheme of the main transformer oil temperature thermometer verification system based on PLC control at least has the following advantages and beneficial effects: the system can be connected into a plurality of pairs of oil thermometer action switching value contacts simultaneously, and the plurality of pairs of oil thermometer action switching value contacts are checked simultaneously.
Drawings
FIG. 1 is a schematic wiring diagram of the background art;
FIG. 2 is a schematic diagram of the overall structure of the verification system according to embodiment 1 of the present utility model;
FIG. 3 is a schematic wiring diagram of the verification system provided in embodiment 1 of the present utility model;
Icon: the device comprises a 1-oil thermometer, an 11-temperature sensing probe, a 2-constant temperature oil groove verification furnace, a 3-verification system, a 301-PLC central processing module, a 302-display screen, a 303-power module, a 304-switching value input interface, a 305-analog value input interface, a 306-monitoring system, a 307-analog value isolation device, a 308-voltage output interface and a 309-communication network port.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
Referring to fig. 2 and 3, fig. 2 is a schematic diagram of an overall structure of the verification system 3 provided by the present utility model, and fig. 3 is a schematic wiring diagram of the verification system 3.
In the embodiment, the calibration system 3 is adopted to replace a universal meter, so that the influence of untimely measurement or error of a measurement contact on the calibration efficiency and the calibration accuracy are avoided. Specifically, the main transformer oil temperature thermometer verification system based on the PLC control provided in this embodiment includes a body with a hollow interior, a power module 303 disposed inside the body, and a PLC central processing module 301, where the PLC central processing module 301 is electrically connected to the power module 303 and is responsible for power supply control of the whole verification system 3.
Further, a 24V voltage output interface 308 connected with a power supply of the oil thermometer 1 through a circuit, a switching value input interface 304 connected with an action switching value contact of the oil thermometer 1 through a circuit, and an analog value input interface 305 connected with a temperature analog value output end of the oil thermometer 1 through a circuit are arranged on the outer side of the body; during verification, the multiple pairs of action switching value contacts of the oil thermometer 1 can be directly connected to the switching value input interface 304, and the analog value output end of the oil thermometer 1 is connected to the analog value input interface 305. Further, the switching value input interface 304 is electrically connected to the power module 303, and the switching value input interface 304 and the analog value input interface 305 are electrically connected to the PLC central processing module 301. In a preferred implementation manner of this embodiment, the 24V voltage output interface 308, the switching value input interface 304 and the analog value input interface 305 are disposed on the same side of the body, so as to facilitate wiring.
Further, the verification system 3 further comprises an analog quantity isolation device 307, an input end of the analog quantity isolation device 307 is connected with an analog quantity output end of the oil thermometer 1 through a line, a first output end of the analog quantity isolation device 307 is connected to the analog quantity input interface 305, and a second output end of the analog quantity isolation device 307 is connected to the monitoring system 306. When the oil thermometer 1 is checked, the temperature sensing probe 11 of the oil thermometer 1 is inserted into the constant-temperature oil groove verification furnace 2, a plurality of pairs of action switching value contacts of the oil thermometer 1 are connected to the switching value input interface 304 of the checking system 3, after 4-20mA analog quantity of the oil thermometer 1 is sent to the analog quantity isolating device 307, the output of the mA quantity of the oil thermometer 1 can be changed from one path to two paths, one path is sent to the monitoring system 306, and the other path is sent to the PLC central processing module 301; the action switching value contact point of the oil thermometer 1 and the 4-20mA analog quantity are finally sent to the PLC central processing module 301 for logic judgment.
Further, the verification system 3 further comprises an LED display screen 302, and the LED display screen 302 is electrically connected with the PLC central processing module 301. In particular, in one implementation manner of this embodiment, the LED display screen 302 is an external LED display screen 302, a communication network port 309 connected to the display screen 302 through a line is disposed on the outer side of the body, and the communication network port 309 is electrically connected to the PLC central processing module 301; preferably, the 24V voltage output interface 308, the switching value input interface 304, the analog value input interface 305, and the communication network port 309 are disposed on the same side. The multiple pairs of action switching value contacts and 4-20mA analog quantity of the oil thermometer 1 are logically judged by the PLC central processing module 301 and then sent to the LED display screen 302 for display. In the verification process of the verification system 3, the LED display screen 302 can display the corresponding temperature of the 4-20mA analog quantity of the oil thermometer 1 in real time, and whether the oil thermometer 1 is accurate or not can be determined by comparing the pointer display value of the oil thermometer 1 with the temperature display value. In addition, when the oil temperature reaches a preset value, the oil thermometer 1 acts on a plurality of pairs of action switching value contacts, and the action temperature of each contact action can be displayed on the LED display screen 302; the problem that the traditional verification method can not display the analog output of the oil thermometer 1 is effectively solved.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The utility model provides a main transformer oil temperature thermometer verification system based on PLC control, its characterized in that, including inside hollow body and locate inside power module (303) of body and PLC central processing module (301), PLC central processing module (301) are connected with power module (303) electricity, the body outside is equipped with voltage output interface (308) that are connected through the circuit with oil thermometer (1) power supply, and the switching value input interface (304) that are connected through the circuit with oil thermometer (1) action switching value contact is with oil thermometer (1) temperature analog output end analog input interface (305) that are connected through the circuit, switching value input interface (304) are connected with power module (303) electricity, switching value input interface (304), analog input interface (305) are all connected with PLC central processing module (301) electricity.
2. The main transformer oil temperature thermometer verification system based on PLC control as claimed in claim 1, further comprising an analog quantity isolation device (307), wherein an input end of the analog quantity isolation device (307) is connected with an analog quantity output end of the oil thermometer (1) through a circuit, a first output end of the analog quantity isolation device (307) is connected to an analog quantity input interface (305), and a second output end of the analog quantity isolation device is connected to a monitoring system (306).
3. The PLC control based main transformer oil temperature thermometer verification system according to any one of claims 1 to 2, further comprising a display screen (302), the display screen (302) being electrically connected to the PLC central processing module (301).
4. The calibration system of the main transformer oil temperature thermometer based on the PLC control according to claim 3, wherein a communication network port (309) connected with the display screen (302) through a line is arranged on the outer side of the body, and the communication network port (309) is electrically connected with the PLC central processing module (301).
5. The system for verifying the main transformer oil temperature thermometer based on the PLC control as set forth in claim 4, wherein the switching value input interface (304), the analog value input interface (305) and the communication network port (309) are arranged on the same side of the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322760093.5U CN220932225U (en) | 2023-10-13 | 2023-10-13 | Main transformer oil temperature thermometer verification system based on PLC control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322760093.5U CN220932225U (en) | 2023-10-13 | 2023-10-13 | Main transformer oil temperature thermometer verification system based on PLC control |
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| Publication Number | Publication Date |
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| CN220932225U true CN220932225U (en) | 2024-05-10 |
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| CN202322760093.5U Active CN220932225U (en) | 2023-10-13 | 2023-10-13 | Main transformer oil temperature thermometer verification system based on PLC control |
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| CN (1) | CN220932225U (en) |
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2023
- 2023-10-13 CN CN202322760093.5U patent/CN220932225U/en active Active
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