CN111929573A - Thermal relay automatic check meter in constant temperature environment - Google Patents
Thermal relay automatic check meter in constant temperature environment Download PDFInfo
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- CN111929573A CN111929573A CN202010732113.6A CN202010732113A CN111929573A CN 111929573 A CN111929573 A CN 111929573A CN 202010732113 A CN202010732113 A CN 202010732113A CN 111929573 A CN111929573 A CN 111929573A
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- microcomputer
- thermal relay
- constant temperature
- calibrator
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention relates to the technical field of equipment operation and maintenance, and particularly discloses an automatic thermal relay calibrator in a constant temperature environment. The device comprises a microcomputer and a Hall element, wherein the Hall element is connected with the microcomputer, feeds back collected signals to the microcomputer for data processing, and transmits the data to a display unit connected with the microcomputer for display. The calibration instrument further comprises a constant temperature environment module, the constant temperature environment module comprises a PTC heating plate and a temperature probe, the PTC heating plate and the temperature probe are respectively connected with a microcomputer, the PTC heating plate provides a constant temperature environment for the heat relay coil, and the temperature probe feeds measured temperature data back to the microcomputer so as to control the start and stop of the PTC heating plate. The automatic thermal relay calibrator solves the problems of heavy, manual and constant-temperature-free environments of the conventional thermal relay calibrator, meets the calibration of the performance parameters of the thermal relay under the constant-temperature requirement, and is simple in operation mode and reliable in performance.
Description
Technical Field
The invention belongs to the technical field of equipment operation and maintenance, and particularly relates to a thermal relay automatic calibrator in a constant temperature environment.
Background
The thermal relay is a protective electrical element for overload protection of a motor or other electrical equipment, when the motor or other electrical equipment is overloaded, the current of a coil of the thermal relay is increased, a large current flows through a bimetallic strip of the thermal relay to increase the temperature of the bimetallic strip of the thermal relay, the bending degree is increased, and an auxiliary contact of the thermal relay is disconnected through a linkage mechanism, so that an alternating current contactor in a control loop is disconnected, the contactor is released in a power failure mode, and the purpose of cutting off a fault load power supply is achieved.
All rotating equipment of a nuclear power plant adopts a circuit configuration of F + C + thermal relays, all alternating current distribution boards comprise the thermal relays, and the number of the alternating current bus thermal relays is as large as forty.
The traditional checking method is to detach the thermal relay, connect the wires by using a thermal relay checking instrument, manually adjust the output current of the thermal relay checking instrument according to the fixed value of the thermal relay, and respectively perform cold-state and hot-state tests on the thermal relay. According to the traditional method, the thermal relay calibrator is heavy, the output current changes along with the fluctuation of the thermal resistance of the coil of the thermal relay, and the output current cannot be relatively constant; meanwhile, the thermal relay is exposed in a space environment, a constant temperature environment does not exist, and in particular, in winter, the calibration work of the thermal relay cannot be smoothly completed due to the problem of the environment temperature.
Disclosure of Invention
The invention aims to provide a thermal relay automatic calibrator in a constant temperature environment, which solves the problems of heavy weight, manual operation and no constant temperature environment of the conventional thermal relay calibrator.
The technical scheme of the invention is as follows: a thermal relay automatic check meter in constant temperature environment comprises a microcomputer, a Hall element and a constant temperature environment device, wherein the Hall element is connected with the microcomputer, and transmits collected signals back to the microcomputer for data processing and then transmits the data to a display unit connected with the microcomputer for display; the constant temperature environment device comprises a PTC heating plate and a temperature probe.
The display unit is a man-machine interaction end of the calibrator, and a user sends model parameters of the thermal relay to be tested and a start detection instruction to a microcomputer through the display unit.
And a current generator and a heat relay coil are sequentially connected between the microcomputer and the Hall element, and the microcomputer controls the current generator to output a certain current to the heat relay coil.
The microcomputer is connected with the button unit, and the button unit controls the check meter to be opened and closed.
The microcomputer and the current generator are respectively connected with a battery module, the battery module is a lithium battery with 12V voltage of 2000mAh, and can provide a working power supply for the whole calibrator.
The microcomputer is connected with a thermal relay contact, and after the action of the thermal relay is detected, a signal for stopping outputting the current is sent to the microcomputer.
The PTC heating plate and the temperature probe are respectively connected with a microcomputer, the PTC heating plate provides a constant temperature environment for the heat relay coil, and the temperature probe feeds measured temperature data back to the microcomputer so as to control the start and stop of the PTC heating plate; the constant temperature environment module is installed in the thermostat, still install the thermal relay three-phase parent plug that establishes ties in the thermostat, the thermal relay three-phase parent plug that establishes ties includes that left thermal relay once inserts the parent, right thermal relay once inserts parent and auxiliary contact external connection.
The button unit comprises a starting button, a starting constant temperature button and a starting verification button.
The device possesses the electric quantity self-checking function, when detecting that the electric quantity is low, carries out the device warning immediately.
The microcomputer adopts an Atmega16 singlechip as a control core.
The temperature probe measures the temperature signal using the DS18B20 temperature probe.
The invention has the following remarkable effects: the automatic calibrator for the thermal relay in the constant temperature environment has the constant temperature heating function and is used for providing a constant temperature test environment for the thermal relay; the output current is fed back to the microcomputer through the Hall element, so that the functions of recording the action time and the current value of the thermal relay and judging whether the thermal relay is qualified or not are realized. The automatic thermal relay calibrator meets the calibration of the performance parameters of the thermal relay under the constant temperature requirement, and has the advantages of simple operation mode and reliable performance.
Drawings
FIG. 1 is a logic diagram of a thermal relay automatic calibrator control in a constant temperature environment according to the present invention;
fig. 2 is a hardware block diagram of the thermal relay automatic calibrator in a constant temperature environment according to the present invention.
In the figure: 1. a microcomputer; 2. a current generator; 3. a thermal relay coil; 4. a thermal contact point; 5. a Hall element; 6. a battery module; 7. a button unit; 8. a display unit; 9. a PTC heating plate; 10. a temperature probe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1-2, the automatic thermal relay calibrator in a constant temperature environment comprises a microcomputer 1 and a hall element 5, wherein the hall element 5 is connected with the microcomputer 1 and feeds back acquired signals to the microcomputer 1 for data processing, and the microcomputer 1 adopts an Atmega16 singlechip as a control core and can transmit the processed data to a display unit 8 connected with the microcomputer 1 for display; the display unit 8 is a man-machine interaction end of the calibrator, and a user sends a model parameter of the thermal relay to be tested and a start detection instruction to the microcomputer 1 for processing through the display unit 8; a current generator 2 and a heat relay coil 3 are sequentially connected between the microcomputer 1 and the Hall element 5, and the microcomputer 1 controls the current generator 2 to output a certain current to the heat relay coil 3 so as to verify the heat relay coil; the microcomputer 1 is connected with a button unit 7, and the button unit 7 controls the check meter to be opened and closed; the microcomputer 1 and the current generator 2 are respectively connected with a battery module 6, and the battery module 6 is a lithium battery with 12V voltage of 2000mAh and can provide a working power supply for the whole calibrator; the microcomputer 1 is connected with a heat relay contact 4, and after the heat relay coil 3 is detected to act, a signal for stopping outputting current is sent to the microcomputer 1; the calibrator further comprises a constant temperature environment module, the constant temperature environment module comprises a PTC heating plate 9 and a temperature probe 10, the PTC heating plate 9 and the temperature probe 10 are respectively connected with the microcomputer 1, the PTC heating plate 9 provides a constant temperature environment for the heat relay coil 3, and the temperature probe 10 feeds measured temperature data back to the microcomputer 1, so that the start and stop of the PTC heating plate 9 are controlled; the checking environment module is installed in the thermostat, still install the thermal relay three-phase parent plug that establishes ties in the thermostat, the thermal relay three-phase parent plug that establishes ties includes that left thermal relay once inserts the parent, right thermal relay once inserts parent and auxiliary contact external connection.
When the thermal relay automatic calibrator in the constant temperature environment works, the operation steps are as follows:
s1: putting the hot relay coil 3 into a thermostat;
s2: pressing the starting button, powering on the device, carrying out electric quantity self-checking, and immediately alarming if the electric quantity of the battery module 6 is low;
s3: inputting parameters of the hot relay coil 3 to be verified in the display unit 8, and automatically calculating cold-state and hot-state output current values of the hot relay coil 3 by a calibrator;
s4: starting a constant temperature environment, feeding back the temperature of the test environment in the constant temperature box to the microcomputer 1 in real time through the temperature probe 10 in the constant temperature box, and displaying a temperature value on the display unit 8;
s5: after the temperature meets the checking requirement, a checking start button is pressed according to the prompt of the display unit 8, the current generator 2 outputs current to the heat relay coil 3, and the output current is fed back to the microcomputer 1 through the Hall element 5 in a closed loop manner;
s6: after the hot relay coil 3 acts, the microcomputer 1 records the action time and the instantaneous current value, judges whether the verification result is qualified or not, and ends the cold environment test;
s7: repeating the steps S4-S6, and continuing the thermal environment test;
s8: and deriving a cold state environment test result and a hot state test result.
Claims (12)
1. The utility model provides a thermal relay automatic check gauge of constant temperature environment which characterized in that: the device comprises a microcomputer (1), a Hall element (5) and a constant temperature environment device, wherein the Hall element (5) is connected with the microcomputer (1), feeds back collected signals to the microcomputer (1) for data processing, and transmits the data to a display unit (8) connected with the microcomputer (1) for display; the constant temperature environment device comprises a PTC heating plate (9) and a temperature probe (10).
2. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the display unit (8) is a man-machine interaction end of the calibrator, and a user sends model parameters of the thermal relay to be tested and a start detection instruction to the microcomputer (1) through the display unit (8).
3. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: a current generator (2) and a heat relay coil (3) are sequentially connected between the microcomputer (1) and the Hall element (5), and the microcomputer (1) controls the current generator (2) to output a certain current to the heat relay coil (3).
4. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the microcomputer (1) is connected with the button unit (7), and the button unit (7) controls the check meter to be opened and closed.
5. The thermal relay automatic calibrator for the thermostatic environment according to claim 1), wherein: the microcomputer (1) and the current generator (2) are respectively connected with a battery module (6), and the battery module (6) is a lithium battery with 12V voltage of 2000mAh and can provide a working power supply for the whole calibrator.
6. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the microcomputer (1) is connected with a thermal relay contact (4), and after the action of the thermal relay is detected, a signal for stopping outputting the current is sent to the microcomputer (1).
7. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the PTC heating plate (9) and the temperature probe (10) are respectively connected with the microcomputer (1), the PTC heating plate (9) provides a constant temperature environment for the heat relay coil (3), and the temperature probe (10) feeds measured temperature data back to the microcomputer (1) so as to control the start and stop of the PTC heating plate (9); the constant temperature environment module is installed in the thermostat, still install the thermal relay three-phase parent plug that establishes ties in the thermostat, the thermal relay three-phase parent plug that establishes ties includes that left thermal relay once inserts the parent, right thermal relay once inserts parent and auxiliary contact external connection.
8. The thermal relay automatic calibrator for a thermostatic environment according to claim 4, wherein: the button unit (7) comprises a starting button, a starting constant temperature button and a starting verification button.
9. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the device possesses the electric quantity self-checking function, when detecting that the electric quantity is low, carries out the device warning immediately.
10. The thermal relay automatic calibrator for a thermostatic environment according to claim 1, characterized in that: the micro-electricity (1)) adopts an Atmega16 single-chip microcomputer as a control core.
11. The thermal relay automatic calibrator for a thermostatic environment according to claim 7, wherein: the temperature probe (10) measures a temperature signal using a DS18B20 temperature probe.
12. A thermal relay automatic calibrator for a thermostatic environment according to any one of claims 1 to 11, wherein: the method comprises the following operation steps:
s1: putting the hot relay coil 3 into a thermostat;
s2: pressing the starting button, powering on the device, carrying out electric quantity self-checking, and immediately alarming if the electric quantity of the battery module 6 is low;
s3: inputting parameters of the hot relay coil 3 to be verified in the display unit 8, and automatically calculating cold-state and hot-state output current values of the hot relay coil 3 by a calibrator;
s4: starting a constant temperature environment, feeding back the temperature of the test environment in the constant temperature box to the microcomputer 1 in real time through the temperature probe 10 in the constant temperature box, and displaying a temperature value on the display unit 8;
s5: after the temperature meets the checking requirement, a checking start button is pressed according to the prompt of the display unit 8, the current generator 2 outputs current to the heat relay coil 3, and the output current is fed back to the microcomputer 1 through the Hall element 5 in a closed loop manner;
s6: after the hot relay coil 3 acts, the microcomputer 1 records the action time and the instantaneous current value, judges whether the verification result is qualified or not, and ends the cold environment test;
s7: repeating the steps S4-S6, and continuing the thermal environment test;
s8: and deriving a cold state environment test result and a hot state test result.
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| CN202010732113.6A CN111929573A (en) | 2020-07-27 | 2020-07-27 | Thermal relay automatic check meter in constant temperature environment |
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| CN202010732113.6A CN111929573A (en) | 2020-07-27 | 2020-07-27 | Thermal relay automatic check meter in constant temperature environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774027A (en) * | 2023-06-05 | 2023-09-19 | 中核检修有限公司 | Thermal relay detection method and device, storage medium and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774027A (en) * | 2023-06-05 | 2023-09-19 | 中核检修有限公司 | Thermal relay detection method and device, storage medium and electronic equipment |
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