CN109256753B - Calibration method of infrared temperature sensing protection online calibration device in electric power high-voltage cabinet - Google Patents
Calibration method of infrared temperature sensing protection online calibration device in electric power high-voltage cabinet Download PDFInfo
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- CN109256753B CN109256753B CN201811141773.6A CN201811141773A CN109256753B CN 109256753 B CN109256753 B CN 109256753B CN 201811141773 A CN201811141773 A CN 201811141773A CN 109256753 B CN109256753 B CN 109256753B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 88
- 239000000523 sample Substances 0.000 claims abstract description 84
- 230000003211 malignant effect Effects 0.000 claims abstract description 18
- 238000013021 overheating Methods 0.000 claims description 40
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 27
- 239000013307 optical fiber Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B11/00—Switchgear having carriage withdrawable for isolation
- H02B11/26—Arrangements of fuses, resistors, voltage arresters or the like
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention relates to an on-line calibration device and a calibration method for infrared temperature sensing protection in an electric power high-voltage cabinet, which are characterized in that: the device comprises an electric high-voltage cabinet, a temperature converter, a control module, a temperature benchmarking device and an electric high-voltage cabinet protection system; the method comprises the steps that temperature measurement scanning is carried out on high-voltage equipment in the electric high-voltage cabinet through a miniature infrared temperature measurement probe in the electric high-voltage cabinet, the high-voltage equipment is transmitted to a temperature converter, the temperature converter is transmitted to a control module after conversion and is compared with a preset fault value in the control module, if the fault value reaches a slight or moderate overheat fault value, an overheat alarm in a protection system of the electric high-voltage cabinet gives an alarm, and if a sudden malignant overheat fault trip value is reached, the control module controls a trip coil of a circuit breaker to act, so that a switch is controlled to trip. The invention can ensure that the high-voltage power cabinet is safely, timely and effectively protected when an overheat fault occurs under the condition of non-contact temperature sensing.
Description
Technical Field
The invention relates to the field of electric power high-voltage temperature testing, in particular to a calibration method of an infrared temperature sensing protection online calibration device in an electric power high-voltage cabinet.
Background
High-voltage equipment in the electric power high-voltage cabinet can generate heat due to electromagnetic action in operation, the heating temperature of the high-voltage equipment in normal operation is within a normal temperature value range, when faults such as poor contact, overload, dampness or equipment defects occur, hot spots higher than the normal operation temperature range are generated at fault points, the hot spot temperature is higher along with the fault development degree, if no alarm is given, even if slight overheating faults can be rapidly developed into serious faults. When sudden malignant faults such as short-time serious overload, short circuit, serious ground loss, overvoltage impact and the like occur, the hot point temperature of the high-voltage cabinet rises suddenly in a short time, and at the moment, if a breaker is not tripped to cut off a power supply timely, accidents are enlarged, even the high-voltage cabinet is exploded and damaged, and serious accidents endanger the personal safety and the power grid safety occur. In the traditional overheat protection method for the electric power high-voltage cabinet, the cabinet door is strictly forbidden to be opened for test and observation in operation, because high-voltage equipment in the high-voltage cabinet has high voltage, a common temperature measuring probe cannot directly contact with a charged temperature sensing part, and in operation, a worker can only carry an infrared temperature measuring instrument to measure the temperature of the shell of the high-voltage cabinet and compare the temperature with the shell of other cabinets so as to judge whether a heating fault exists or not; or power failure is adopted, and the cabinet door is opened to determine whether an overheating fault exists or not by measuring the contact direct current resistance. The former method is seriously lagged, and heat possibly emitted from a fault heating point is conducted to the cabinet wall equipment through air and is burnt out early; the second method needs power failure and cannot be carried out in a live-line mode in operation, and the two existing traditional methods cannot guarantee safety, timeliness and effectiveness to protect the electric power high-voltage cabinet when an overheat fault occurs.
Disclosure of Invention
In view of the above, the present invention provides a calibration method for an infrared temperature-sensing protection online calibration device in an electric high voltage cabinet, which can ensure that the electric high voltage cabinet is safely, timely and effectively protected when an overheat fault occurs in the electric high voltage cabinet under the condition of non-contact temperature sensing.
The invention is realized by adopting the following scheme: a calibration method of an infrared temperature sensing protection online calibration device in an electric high-voltage cabinet comprises the steps of providing the electric high-voltage cabinet, a temperature benchmarking device and an electric high-voltage cabinet protection system; the electric power high-voltage cabinet comprises a handcart breaker, a bus bar, an isolating switch, a high-voltage wire, a mutual inductor, a grounding disconnecting link, a lightning arrester and an outgoing cable;
the method comprises the following steps:
step S1: a micro infrared temperature measuring probe and a probe steering gear are arranged in the electric high-voltage cabinet; the temperature calibration device is arranged on the wall of the electric high-voltage cabinet and comprises a silver alloy plate (or other materials with excellent heat-conducting property) and a standard temperature measuring probe;
step S2: providing a high-voltage power cabinet protection system, wherein the high-voltage power cabinet protection system comprises an overheat alarm, a circuit breaker and a circuit breaker tripping coil;
step S3: providing a control system, wherein the control system comprises a temperature converter and a control module;
step S4: the micro infrared temperature measurement probe in the electric high-voltage cabinet performs temperature measurement scanning on electric high-voltage equipment in the electric high-voltage cabinet through the probe steering gear, and transmits infrared temperature measurement data to the temperature converter through optical fibers or wirelessly;
step S5: transmitting the infrared temperature measurement value converted by the temperature converter in the step S4 to a control module, and when the infrared temperature measurement value reaches a slight overheating fault value, sending a slight overheating fault alarm signal by an overheating alarm in the power high-voltage cabinet protection system to remind a worker to check and monitor;
step S6: transmitting the infrared temperature measurement value converted by the temperature converter in the step S4 to a control module, and when the infrared temperature measurement value reaches a moderate overheating fault value, an overheating alarm in the electric power high-voltage cabinet protection system sends a moderate overheating fault alarm signal to remind a worker to take measures to check and overhaul as soon as possible;
step S7: and (4) transmitting the infrared temperature measurement value converted by the temperature converter in the step (S4) to a control module, immediately controlling the miniature infrared temperature measurement probe to turn to the temperature to measure the temperature of the inner wall of the silver alloy plate of the standard when the infrared temperature measurement value reaches the set sudden malignant overheating fault trip value, comparing the temperature with temperature measurement data of the temperature measured by a standard temperature measurement probe of the standard.
Furthermore, the silver alloy plate is directly welded on the designated opening position of the electric high-voltage cabinet and is integrated with the electric high-voltage cabinet, the designated opening position of the electric high-voltage cabinet is determined by the convenient steering alignment of the miniature infrared temperature measuring probe in the cabinet, and the standard temperature measuring probe is attached to the silver alloy plate.
Preferably, the invention also provides a device based on the method, which comprises an electric high-voltage cabinet, a temperature converter, a control module, a temperature benchmarking device and an electric high-voltage cabinet protection system;
a miniature infrared temperature measuring probe, a probe steering gear, a handcart circuit breaker, a bus bar, an isolating switch, a high-voltage wiring, a mutual inductor, a grounding disconnecting link, a lightning arrester and an outgoing cable are arranged in the electric power high-voltage cabinet;
the temperature calibration device is arranged on the wall of the electric high-voltage cabinet and comprises a silver alloy plate (or other materials with excellent heat-conducting property) and a standard temperature measuring probe, wherein the silver alloy plate is directly welded on the specified hole position of the electric high-voltage cabinet and is integrated with the electric high-voltage cabinet, and the standard temperature measuring probe is attached to the silver alloy plate; the standard temperature measurement probe transmits the instant temperature on the silver alloy plate to the temperature converter of the background on line through optical fiber or wireless transmission, and when the calibration is needed, the infrared temperature measurement probe in the cabinet is turned to align the inner wall of the silver alloy plate and stays, and at the moment, the infrared temperature measurement data in the cabinet is compared with the temperature measurement data of the standard temperature measurement probe outside the cabinet, and whether the error is within an allowable range is judged.
The electric power high-voltage cabinet protection system comprises an overheat alarm, a breaker and a breaker tripping coil;
the input end of the temperature converter is respectively and electrically connected with the output end of a miniature infrared temperature measuring probe in the electric high-voltage cabinet and the output end of a standard temperature measuring probe for receiving temperature data sent by the miniature infrared temperature measuring probe and the standard temperature measuring probe, the output end of the temperature converter is electrically connected with the input end of a control module for sending the converted temperature data of the miniature infrared temperature measuring probe and the standard temperature measuring probe to the control module, the output end of the control module is respectively and electrically connected with the input end of an overheat alarm in the electric high-voltage cabinet protection system and the input end of a breaker tripping coil for controlling the action of the breaker tripping coil when the infrared temperature measuring value reaches a slight or moderate overheat fault value or a sudden malignant overheat fault tripping value so as to control the tripping of a switch, and the output end of the breaker tripping coil is electrically connected with the input end of a breaker, the tripping control device is used for controlling the tripping of the moving contact of the breaker of the electric high-voltage cabinet protection system.
Particularly, the miniature infrared temperature measurement probe is arranged on the probe steering gear to form a whole and is jointly arranged in the high-voltage cabinet and meets the appropriate position of the safe distance of the high-voltage level, the miniature infrared temperature measurement probe scans and measures the temperature of high-voltage equipment in the cabinet through the probe steering gear and transmits temperature measurement data to the temperature converter through optical fibers or wireless transmission, and when the temperature measurement value reaches the temperature set value of a fault point, the miniature infrared temperature measurement probe immediately turns to the temperature calibration device to carry out temperature calibration.
Particularly, the temperature converter is characterized in that before the micro infrared temperature measuring probe is installed, infrared temperature measurement is carried out at various temperatures from low temperature to high temperature, a temperature measuring electric signal is compared with temperature data measured by a standard thermometer and is designed and programmed into a functional relation, then design programming for calculating the accuracy of the measured high-temperature or low-temperature data by measuring one or two pieces of low-temperature or normal-temperature data is carried out, and the temperature converter is also designed and programmed with a program for converting different environment temperature measurement values into standard temperature measurement values.
Particularly, the control module is pre-designed and programmed with early warning values of slight and moderate overheating temperature faults of all high-voltage equipment in the electric high-voltage cabinet and sudden malignant overheating fault trip values. The design programming for sudden malignant overtemperature faults is as follows: when the infrared temperature measurement reaches the set sudden malignant overheating fault trip value, the infrared temperature measurement probe is immediately controlled to turn to measure the temperature of the temperature benchmarking device, the temperature measurement is compared with the temperature measurement of a standard temperature measurement probe of the temperature benchmarking device, only when the temperature measurement error of the infrared temperature measurement probe is smaller than the set value, the control module can control the trip coil of the high-voltage power cabinet protection system to act, the switch is controlled to trip, otherwise, the trip action command is not executed, the tripping action command is not executed, the fact that the tripping action of the switch is controlled when the sudden malignant overheating fault really occurs is guaranteed, the power supply is cut off, the malignant accident is prevented from being enlarged, the occurrence of misoperation of the switch caused by the infrared temperature measurement failure or the overlarge error is avoided, and the safety.
In particular, the electric high-voltage cabinet protection system comprises: the protection system receives alarm instructions that the control module sends out slight and moderate overheating faults of the high-voltage equipment, the alarm sends out different alarm warning signals respectively to remind workers to check and process as soon as possible. When the protection system receives an instruction of sudden malignant overheating fault tripping sent by the control module, a tripping coil of a breaker of the protection system acts, contacts of the breaker are separated, a power supply is rapidly cut off, and the accident is prevented from further expanding.
Compared with the prior art, the invention has the following beneficial effects:
the invention can accurately and rapidly control the tripping of the circuit breaker when a malignant sudden overheating fault really occurs, prevent the expansion of accidents, avoid the serious consequence that the infrared temperature sensing device possibly causes inaccurate temperature sensing or malfunction to cause switch tripping due to long quality or service time, powerfully ensure the safety of power system workers and power grid equipment and reduce economic loss.
Drawings
Fig. 1 is a diagram of high-voltage equipment inside an electric high-voltage switch cabinet according to an embodiment of the invention.
Fig. 2 is a schematic diagram of equipment in an infrared probe scanning cabinet of the online calibration device for infrared temperature sensing protection in an electric high-voltage cabinet according to the embodiment of the invention.
Fig. 3 is a working schematic diagram of temperature calibration of the infrared temperature measuring probe steering temperature calibration standard according to the embodiment of the invention.
Fig. 4 is a schematic diagram of a wiring diagram of a control module of the infrared temperature sensing protection online calibration device in the high-voltage power cabinet according to the embodiment of the invention during normal operation.
Fig. 5 is a block diagram illustrating the principle of the control module controlling the alarm when a mild or moderate overheating fault occurs according to the embodiment of the present invention.
Fig. 6 is a block diagram illustrating the principle of the control module controlling the circuit breaker to trip when a sudden and severe overheating fault occurs according to an embodiment of the present invention.
In the figure, 1 is an electric power high-voltage cabinet, 2 is a miniature infrared temperature measuring probe, 3 is a probe steering gear, 4 is a handcart breaker, 5 is a bus bar, 6 is an isolating switch, 7 is a high-voltage connection, 8 is a mutual inductor, 9 is a grounding disconnecting link, 10 is a lightning arrester, 11 is an outgoing cable, 12 is an optical fiber, 13 is a silver alloy plate, 14 is a standard temperature measuring probe, 15 is a temperature converter, 16 is a control module, 17 is an overheat alarm, 18 is a breaker tripping coil, 19 is a breaker and 20 is infrared rays.
Detailed description of the invention
The invention is further explained below with reference to the drawings and the embodiments.
As shown in fig. 2, a calibration method of an infrared temperature sensing protection online calibration device in an electric power high voltage cabinet comprises an electric power high voltage cabinet 1, a temperature calibrator and an electric power high voltage cabinet protection system; the electric power high-voltage cabinet comprises a handcart circuit breaker 4, a bus bar 5, an isolating switch 6, a high-voltage wiring 7, a mutual inductor 8, a grounding disconnecting link 9, a lightning arrester 10 and an outgoing cable 11.
As shown in fig. 5 and 6, the method comprises the following steps:
step S1: a micro infrared temperature measuring probe 2 and a probe steering gear 3 are arranged in the electric high-voltage cabinet; a temperature calibration device is arranged on the wall of the electric high-voltage cabinet and comprises a silver alloy plate 13 (or other materials with excellent heat-conducting property) and a standard temperature measuring probe 14;
step S2: providing a power high-voltage cabinet protection system, wherein the power high-voltage cabinet protection system comprises an overheat alarm 17, a circuit breaker 19 and a circuit breaker tripping coil 18;
step S3: providing a control system, wherein the control system comprises a temperature converter 15 and a control module 16;
step S4: the miniature infrared temperature measurement probe 2 in the electric high-voltage cabinet 1 performs temperature measurement scanning on electric high-voltage equipment in the electric high-voltage cabinet 1 through the probe steering gear 3, and transmits infrared temperature measurement data to the temperature converter 15 through optical fibers or wireless transmission;
step S5: transmitting the infrared temperature measurement value converted by the temperature converter 15 in the step S4 to the control module 16, and when the infrared temperature measurement value reaches a slight overheating fault value, sending a slight overheating fault alarm signal by an overheating alarm 17 in the electric power high-voltage cabinet protection system to remind a worker to check and monitor;
step S6: transmitting the infrared temperature measurement value converted by the temperature converter 15 in the step S4 to the control module 16, and when the infrared temperature measurement value reaches a medium overheating fault value, sending a medium overheating fault alarm signal by an overheating alarm 17 in the electric power high-voltage cabinet protection system to remind a worker to take measures to check and overhaul as soon as possible;
step S7: and (4) transmitting the infrared temperature measurement value converted by the temperature converter 15 in the step (S4) to the control module 16, when the infrared temperature measurement value reaches the set sudden malignant overheating fault trip value, immediately controlling the miniature infrared temperature measurement probe 2 to turn to the temperature to measure the temperature of the inner wall of the silver alloy plate 13 of the standard device, comparing the temperature with the temperature measurement data of the instant temperature measured on the silver alloy plate 13 by the standard temperature measurement probe 14 of the standard device, if the error of the comparison result is smaller than the set value, controlling the trip coil 18 of the circuit breaker of the power high-voltage cabinet protection system to act by the control module 16, and controlling the trip of the switch, otherwise, not executing a trip action command. Therefore, the control switch is controlled to trip to cut off the power supply when sudden severe overheating faults occur, so that severe accidents are prevented, the condition that the switch malfunctions due to infrared temperature measurement failure or overlarge errors is avoided, and the safe operation of a power grid is powerfully guaranteed.
In this embodiment, the silver alloy plate 13 is directly welded at the specified opening position of the electric high-voltage cabinet 1 and is integrated with the electric high-voltage cabinet 1, the specified opening position of the electric high-voltage cabinet 1 is determined by the convenient steering alignment of the miniature infrared temperature measurement probe 2 in the cabinet, the standard temperature measurement probe 14 is attached to the silver alloy plate 13, the standard temperature measurement probe 14 transmits the instant temperature on the silver alloy plate 13 to the background temperature converter 15 on line through optical fiber or wireless transmission, the calibration is required, the infrared temperature measurement probe 2 in the cabinet is steered to the inner wall of the silver alloy plate 13 and stays, at the moment, the infrared temperature measurement data in the cabinet and the temperature measurement data of the standard temperature measurement probe outside the cabinet are compared, and whether the error is within an allowable range is determined.
Preferably, the embodiment further provides a device based on the method, which includes an electric high voltage cabinet 1, a temperature converter 15, a control module 16, a temperature calibrator, and an electric high voltage cabinet protection system;
as shown in fig. 1, the electric power high-voltage cabinet 1 comprises a miniature infrared temperature measuring probe 2, a probe steering gear 3, a handcart circuit breaker 4, a bus bar 5, an isolating switch 6, a high-voltage connection 7, a mutual inductor 8, a grounding disconnecting link 9, a lightning arrester 10 and an outgoing cable 11;
the temperature calibrator is arranged on the wall of the high-voltage power cabinet 1 and comprises a silver alloy plate 13 (or other materials with excellent heat conductivity) and a standard temperature measuring probe 14, wherein the silver alloy plate 13 is directly welded on a specified hole position of the high-voltage power cabinet 1 and is integrated with the high-voltage power cabinet 1, and the standard temperature measuring probe 14 is attached to the silver alloy plate 13; as shown in fig. 3, the standard temperature probe 14 transmits the instant temperature on the silver alloy plate 13 to the background temperature converter 15 on line through the optical fiber 12 or wireless transmission, when the calibration is needed, the infrared temperature probe 2 in the cabinet is turned to be aligned with the inner wall of the silver alloy plate 13 and stays, at this time, the infrared temperature data in the cabinet is compared with the temperature data of the standard temperature probe 14 outside the cabinet, and whether the error is within the allowable range is determined.
The protection system of the electric high-voltage cabinet comprises an overheat alarm 17, a breaker 19 and a breaker tripping coil 18;
as shown in fig. 4, the input end of the temperature converter 15 is electrically connected to the output end of the micro infrared temperature probe 2 and the output end of the standard temperature probe 14 in the high voltage power cabinet 1, respectively, for receiving the temperature data sent by the micro infrared temperature probe 2 and the standard temperature probe 14, the output end of the temperature converter 15 is electrically connected to the input end of the control module 16, for sending the converted temperature data of the micro infrared temperature probe 2 and the standard temperature probe 14 to the control module 16, the output end of the control module 16 is electrically connected to the input end of the overheat alarm 17 and the input end of the trip coil 18 of the circuit breaker in the high voltage power cabinet protection system, respectively, for controlling the trip coil 18 of the circuit breaker to operate when the infrared temperature value reaches a slight, moderate overheat fault value or a malignant sudden overheat fault trip value, and further controlling the switch to trip, the output end of the circuit breaker tripping coil 18 is electrically connected with the input end of the circuit breaker 19, and is used for controlling the tripping of a breaker moving contact of the electric high-voltage cabinet protection system.
Particularly, in this embodiment, the miniature infrared temperature measurement probe 2 is installed on the probe steering gear to form a whole, and is installed in the high-voltage cabinet together, and meets the appropriate place of the safe distance of the high-voltage level, the miniature infrared temperature measurement probe 2 scans and measures the temperature of the high-voltage equipment in the cabinet through the probe steering gear 3, and transmits the temperature measurement data to the temperature converter 15 through optical fiber or wireless transmission, and when the temperature measurement value reaches the fault point temperature setting value, the miniature infrared temperature measurement probe 2 should turn to the temperature calibration of the temperature calibration standard immediately.
In particular, in the present embodiment, the temperature converter 15 performs infrared temperature measurement at various temperatures from low temperature to high temperature before the micro infrared temperature measurement probe 2 is installed, compares the temperature measurement electrical signal with the temperature data measured by the standard thermometer, and designs and programs the temperature measurement electrical signal into a functional relationship, and then performs design and programming that the accuracy of the measured high temperature or low temperature data can be calculated by measuring one or two low temperature or normal temperature data, and the temperature converter 15 further designs and programs a program for converting the temperature measurement values of different environmental temperatures into the temperature measurement values of the standard temperature.
In particular, in the present embodiment, the control module 16 is pre-programmed with early warning values of slight and moderate overheating temperature faults of each high-voltage device in the high-voltage power cabinet 1, and a sudden and severe overheating fault trip value. The design programming for sudden malignant overtemperature faults is as follows: when the infrared temperature measurement reaches the set sudden malignant overheating fault trip value, the infrared temperature measurement probe 2 is immediately controlled to turn to measure the temperature of the temperature benchmarking device, the temperature of the infrared temperature measurement probe is compared with the temperature of the standard temperature measurement probe 14 of the temperature benchmarking device, only when the temperature measurement error of the infrared temperature measurement probe and the temperature measurement error of the standard temperature measurement probe 14 are smaller than the set value, the control module 16 can control the trip coil 18 of the electric high-voltage cabinet protection system to act and control the switch to trip, otherwise, the trip action command is not executed, thus not only ensuring that the switch is controlled to trip when the sudden malignant overheating fault really occurs and the power supply is cut off, preventing the malignant accident from being enlarged, but also avoiding the occurrence of switch misoperation caused by the infrared temperature measurement failure or the overlarge error.
In particular, in this embodiment, the electric high-voltage cabinet protection system includes: the protection system comprises an overheating alarm 17, a circuit breaker 19 and a circuit breaker tripping coil 20, wherein when the protection system receives an alarm instruction that the control module 16 sends out slight and moderate overheating faults of the high-voltage equipment, the alarm 17 sends out different alarm warning signals respectively to remind a worker to check and process as soon as possible. When the protection system receives an instruction of sudden severe overheating fault tripping sent by the control module 16, the tripping coil 18 of the circuit breaker of the protection system acts, the contact of the circuit breaker is separated, the power supply is cut off rapidly, and the accident is prevented from further expanding.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (1)
1. A calibration method of an infrared temperature sensing protection online calibration device in an electric power high-voltage cabinet is characterized by comprising the following steps: the temperature calibration device comprises an electric high-voltage cabinet, a temperature calibration device and an electric high-voltage cabinet protection system; the electric power high-voltage cabinet comprises a handcart breaker, a bus bar, an isolating switch, a high-voltage wire, a mutual inductor, a grounding disconnecting link, a lightning arrester and an outgoing cable;
the method comprises the following steps:
step S1: a micro infrared temperature measuring probe and a probe steering gear are arranged in the electric high-voltage cabinet; the temperature calibration device is arranged on the wall of the electric high-voltage cabinet and comprises a silver alloy plate and a standard temperature measuring probe;
step S2: providing a high-voltage power cabinet protection system, wherein the high-voltage power cabinet protection system comprises an overheat alarm, a circuit breaker and a circuit breaker tripping coil;
step S3: providing a control system, wherein the control system comprises a temperature converter and a control module;
step S4: the micro infrared temperature measurement probe in the electric high-voltage cabinet performs temperature measurement scanning on electric high-voltage equipment in the electric high-voltage cabinet through the probe steering gear, and transmits infrared temperature measurement data to the temperature converter through optical fibers or wirelessly;
step S5: transmitting the infrared temperature measurement value converted by the temperature converter in the step S4 to a control module, and when the infrared temperature measurement value reaches a slight overheating fault value, sending a slight overheating fault alarm signal by an overheating alarm in the power high-voltage cabinet protection system to remind a worker to check and monitor;
step S6: transmitting the infrared temperature measurement value converted by the temperature converter in the step S4 to a control module, and when the infrared temperature measurement value reaches a moderate overheating fault value, an overheating alarm in the electric power high-voltage cabinet protection system sends a moderate overheating fault alarm signal to remind a worker to take measures to check and overhaul as soon as possible;
step S7: transmitting the infrared temperature measurement value converted by the temperature converter in the step S4 to a control module, immediately controlling a miniature infrared temperature measurement probe to turn to temperature to measure the temperature of the inner wall of the silver alloy plate of the standard when the infrared temperature measurement value reaches the set sudden malignant overheating fault trip value, comparing the temperature with temperature measurement data of the temperature measured on the silver alloy plate by a standard temperature measurement probe of the standard temperature measurement probe, if the error of the comparison result is smaller than the set value, controlling a breaker trip coil of the electric high-voltage cabinet protection system to act, controlling a switch;
the silver alloy plate is directly welded on the designated hole position of the electric high-voltage cabinet and is integrated with the electric high-voltage cabinet, the designated hole position of the electric high-voltage cabinet is determined by the convenient steering alignment of the miniature infrared temperature measuring probe in the cabinet, and the standard temperature measuring probe is attached to the silver alloy plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2356341Y (en) * | 1998-10-19 | 1999-12-29 | 石家庄铁路分局科技开发中心 | Dynamic detector for infrared shaft temperature test equipment |
| JP4242334B2 (en) * | 2004-11-30 | 2009-03-25 | 本田技研工業株式会社 | Vehicle periphery monitoring device |
| CN101706331B (en) * | 2009-09-28 | 2011-06-29 | 田陆 | Temperature sensor detector |
| CN104458013B (en) * | 2014-12-04 | 2017-11-24 | 北京振兴计量测试研究所 | A kind of more mould measuring systems in engine thermal safeguard structure temperature field |
| CN104681367B (en) * | 2015-02-11 | 2016-08-17 | 国家电网公司 | The optical fiber infrared of power disconnecting switch hot stall controls trip free device and method |
| CN105633910B (en) * | 2016-02-19 | 2018-11-27 | 国网福建省电力有限公司 | A kind of power high voltage Intelligent switch cabinet non-electricity protecting device and control method |
| CN106532738A (en) * | 2017-01-03 | 2017-03-22 | 浙江聚弘凯电气有限公司 | Low-voltage intelligent reactive compensation system device |
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2018
- 2018-09-28 CN CN201811141773.6A patent/CN109256753B/en active Active
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