CN120213270A - Full-insulation ring main unit sleeve side prefabricated temperature measurement system and small load current adaptation method - Google Patents
Full-insulation ring main unit sleeve side prefabricated temperature measurement system and small load current adaptation method Download PDFInfo
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- CN120213270A CN120213270A CN202510600864.5A CN202510600864A CN120213270A CN 120213270 A CN120213270 A CN 120213270A CN 202510600864 A CN202510600864 A CN 202510600864A CN 120213270 A CN120213270 A CN 120213270A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/022—Means for indicating or recording specially adapted for thermometers for recording
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to two or more of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to two or more of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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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
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/10—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by displaying of information or by user interaction, e.g. supervisory control and data acquisition [SCADA] systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/12—Monitoring network conditions, e.g. electrical magnitudes or operational status
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/13—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network
- H02J13/1321—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/13—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network
- H02J13/1331—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network using wireless data transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/13—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network
- H02J13/1331—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network using wireless data transmission
- H02J13/1335—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the transmission of data to equipment in the power network using wireless data transmission involving a local wireless network, e.g. Wi-Fi®, ZigBee® or Bluetooth®
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
- H02J13/18—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the remotely-controlled equipment, e.g. converters or transformers
- H02J13/34—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network characterised by the remotely-controlled equipment, e.g. converters or transformers the equipment being switches, relays or circuit breakers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a prefabricated temperature measurement system of a sleeve side of an all-insulation ring main unit, which comprises a wireless three-phase temperature sensor, a host module, an Internet of things gateway and an on-site monitoring terminal. The sensor probe is directly deployed in the insulation gap between the cable head and the sleeve, adopts a high-temperature resistant insulation material and is internally provided with an electromagnetic shielding layer, and supports 2.4GHz wireless communication. And a temperature rise rate analysis algorithm is built in the host module, a least square method is adopted to calculate a triggering early warning mechanism when the slope k is more than or equal to 0.5 ℃ per hour, and an environmental temperature compensation factor is introduced to correct errors. The novel dual-mode power supply system adopts a mode of 'factory pre-integration and plug and play', realizes quick deployment through a DIN guide rail and an anti-misplug aviation plug, and is matched with a dual-mode power supply system to automatically switch low-frequency sampling of a storage battery when current is less than 20A, and the wake-up period is dynamically adjusted through PWM. The scheme solves the problems of large delay of traditional infrared temperature measurement, complex installation of the contact sensor and small load failure.
Description
Technical Field
The invention relates to the technical field of power technology, in particular to a full-insulation ring main unit sleeve side prefabricated temperature measuring system and a small load current adaptation method.
Background
The all-insulated ring main unit is core equipment of a 10/20kV power distribution network, and the reliability of the all-insulated ring main unit directly influences the power supply continuity. The fault proportion of the cable terminal side of the ring main unit reaches 38% -42%, and the partial discharge and the abnormal temperature rise are mainly caused by the defect of the connection between the cable head and the sleeve. Accurate monitoring of insulation gap temperature rise is a critical requirement for preventing insulation breakdown and regional power failure accidents.
Prior art solutions and drawbacks
(One) indirect temperature measurement scheme
1. Infrared temperature measurement technique (such as CN 119533708A)
The defect that the leakage rate of the micro temperature rise (3 ℃) is over 20 percent due to obvious environmental interference, the insulation gap cannot be directly monitored by only measuring the surface temperature and delaying the surface temperature conduction for 10-15 minutes, and the efficiency is low due to manual inspection.
2. Temperature difference threshold comparison technique (such as CN 119533708A)
The defect is that the threshold adaptability is poor, and the false alarm rate is increased to 15% -20%.
(II) contact type temperature measurement scheme
1. Plug embedded sensor (as CN 109632142B)
The method has the defects that the sensor is installed on site and matched for debugging, the sensor is embedded after the cable head plug is disassembled, the adaptability is less than 20% (the suitability research report of the sensor of the network equipment is matched in 2024 of the national institute of electric science), the on-site debugging is calibrated table by table, the time is more than 40 minutes, and the temperature measurement error is more than 5 ℃ due to the manual installation deviation.
2. Rear plug passive power supply (such as CN 118431906A)
The defect that the power is taken by the high-voltage cable battery core, when the load current is less than 50A, the power taking module cannot stably supply power, so that the sensor intermittently fails, the original insulation structure is required to be destroyed during transformation, and the insulation breakdown risk is improved by 30% after transformation through the verification of DL/T5352-2018 standard.
(III) System integration scheme
1. Remote data interaction (e.g. CN 112702438B)
And the defect that the key point position temperature measurement structure is not optimized is that the sensor deployment deviates from the core area.
2. Image aided analysis (e.g. CN 118603184A)
The defect is that the hardware cost is increased by 25%, and the algorithm is delayed for 8-10 seconds.
Core pain points not addressed by the prior art:
1. the monitoring blind area is that the sensor is isolated from the insulation gap, the error is more than 3 ℃, and the early temperature rise (0.5 ℃ per hour) can not be captured.
2. The deployment is low-efficiency, the field installation qualification rate is less than 80 percent, and the debugging period is long (100 stations need 2 weeks).
3. The scene is limited in that the drift rate of the existing electronic sensor is more than 5% below-20 ℃ or above 100 ℃ (according to the technical rules of design of DL/T5352-2018 high-voltage distribution devices), and the operation requirement of the ring main unit in a wide temperature range cannot be met.
Aiming at the pain point, the invention provides a full-insulation ring main unit sleeve side prefabricated temperature measuring system and a small load current adapting method, and the innovative design is derived from three technical breakthroughs:
1. accurate measurement of key point position
The special temperature measuring probe is designed to be directly arranged in an insulation gap (the distance from a discharge point is less than or equal to 2 mm) between the cable head and the sleeve, and is packaged by adopting a high-temperature resistant insulation material (the temperature resistance is 150 ℃ and the insulation grade is more than or equal to 20 kV), so that the problem of the prior art that the periphery is measured instead of the core is solved, and the 0.5 ℃ level measurement precision is realized.
2. Prefabricated integrated design
The mode of factory pre-integration and field plug and play is innovatively adopted, namely pre-integration and function debugging are completed before each module is shipped, quick docking is realized through a standardized aviation plug and DIN guide rail, a host computer is only required to be fixed on site, a power supply is only required to be connected, a self-checking program automatically checks compatibility of a communication link and the module, manual calibration or time consumption of parameter configuration is not required, manual operation errors are avoided, and the installation qualification rate is ensured to be more than or equal to 99%. In the prior art (such as CN 109632142B), although DIN guide rails are adopted for installation, the sensors are required to be paired on site and are not integrated with a prefabricated design, and the guide rail integration of the sensor, the host and the gateway is completed before delivery, so that plug and play is realized, and the on-site debugging error is reduced.
3. Small load current adaptation technique
The ultra-low power consumption sensor and energy management algorithm is adopted, the operation can be stabilized (60% of the activation current is reduced compared with the prior art) when the current is more than or equal to 20A, the storage battery is supported to supply power for standby through the wide-voltage power supply module (24 VDC + -20%), and the continuous monitoring of the full-load period (20A to 2000A) is realized. The energy management algorithm logic is that when the current is < 20A, the sensor switches to low frequency sampling mode (1 time/min) and dynamically adjusts the wake-up period (5-30 min) by PWM technique, and turns off the uncore circuit (e.g. screen backlight) during sleep.
In recent years, the miniaturization of the sensor and the maturing of the 2.4GHz wireless transmission technology provide hardware support for the innovation. However, the prior patent does not combine the three of accurate temperature measurement at the side of the sleeve, prefabricated ready-to-use and small-load stable operation, so that the on-site deployment efficiency is low, the cost is high, the adaptability is insufficient, and a remarkable technical innovation space is reserved for the invention.
Along with intelligent upgrading of the power distribution network, the operation and maintenance mode is changed from 'regular overhaul' to 'predictive maintenance', and full coverage is required for key equipment state monitoring according to the development planning requirements of the intelligent power grid.
The invention is characterized in that:
the structure innovation is that the insulation gap is directly monitored, and the fault early-warning time is advanced by 4-6 hours;
The deployment mode is innovative, the prefabrication design shortens the transformation period by 80 percent, and the ring main unit with stock more than 95 percent is adapted;
Working condition adaptability innovation, namely the small load adaptation technology increases the effective monitoring time to more than 90 percent (verified by a laboratory).
The innovation fills the blank of key point position monitoring, convenient deployment and full load adaptation in the prior art, provides core technical support for ring main unit state maintenance, and meets the urgent requirements of the intelligent power distribution network on high reliability and low operation and maintenance cost.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an all-insulation ring main unit sleeve side prefabricated temperature measuring system and a small load current adapting method, which solve the problems that the traditional infrared temperature measurement is greatly influenced by environment and cannot detect small temperature rise through direct contact temperature measurement and anti-interference design, solve the problem that a small load scene sensor fails in the industry through a 'main power supply and standby storage battery' switching and PWM dynamic awakening technology, and compress field installation time through a modularized factory debugging and standardized interface so as to greatly improve engineering implementation efficiency.
In order to achieve the above purpose, the invention provides a prefabricated temperature measurement system for the sleeve side of an all-insulation ring main unit, which comprises:
(a) The temperature measurement module comprises a wireless three-phase temperature sensor, the distance between a probe and a discharge point is less than or equal to 2 mm, the contact surface is coated with heat conduction silicone grease (the thickness is 0.2 mm +/-0.05 mm), the packaging material is polyimide or silicone rubber and is internally provided with a copper foil shielding layer, the packaging material is deployed in an insulation gap between a cable head and a sleeve, the temperature measurement range is-20 ℃ to 150 ℃, the temperature resistance of the sensor packaging material is more than or equal to 150 ℃ and the insulation grade is more than or equal to 20 kV, and the 2.4GHz wireless communication is supported (ZigBee protocol is met with IEEE 802.15.4 standard);
(b) The host module is fixed in the ring main unit through a DIN guide rail, a linear fitting temperature rise rate analysis algorithm based on continuous sampling values is built in, the algorithm calculates a temperature rise slope k= (T n-t1)/(nDeltat) through a least square method, a warning mechanism is triggered when k is more than or equal to 0.5 ℃ per hour, T n is the nth sampling temperature, deltat is a sampling interval, and an environmental temperature compensation factor alpha=0.02× (T_env/30) is introduced to correct environmental temperature fluctuation interference, wherein T_env is a real-time environmental temperature value;
(c) The gateway module of the internet of things is in communication connection with the host module and supports Modbus 485 serial port, 2.4GHz wireless communication and WIFI/Ethernet data transmission;
(d) The on-site monitoring terminal displays three-phase temperature thermodynamic diagrams and overtemperature alarm information in real time, and is provided with an overtemperature grading alarm function, wherein the temperature is less than or equal to 60 ℃ and is green, the temperature is 60-80 ℃ and is yellow, the temperature is more than or equal to 80 ℃ and red, the alarm is carried out in a buzzing way, 30-day historical data storage and temperature rising trend analysis are supported, and the data compression rate is more than or equal to 50%;
(e) The power module integrates a main power supply and a standby storage battery, is provided with an energy management algorithm, enables a high-frequency sampling mode (1 time/10 seconds) when the current is more than or equal to 20A, and is switched to the standby storage battery to supply power and enables a low-frequency sampling mode (1 time/minute) when the current is less than 20A;
(f) The modules are subjected to pre-integrated debugging before leaving the factory, plug-and-play is realized through a standardized aviation plug with an anti-misplug locating pin and a DIN guide rail, a built-in self-checking program is automatically triggered after the host module is electrified, and the self-checking program automatically checks a communication link, a power supply state and module compatibility.
Preferably, the wireless three-phase temperature sensor is integrated with a miniature current transformer, self-electricity is obtained through induction of cable current, and a standby storage battery with the capacity of more than or equal to 500 mAh is arranged in the miniature current transformer.
Preferably, the gateway module of the internet of things supports a debugging program of a mobile phone terminal connected with Bluetooth, establishes a data link with an on-site monitoring terminal in a two-dimensional code scanning or Bluetooth rapid pairing mode, and is internally provided with an AES-256 (advanced encryption standard-256 bits) encryption and frequency hopping anti-interference technology, wherein the data transmission delay is less than or equal to 200 ms.
Preferably, the energy management algorithm further comprises:
(1) When the current lasts for 5 minutes < 20A, starting the standby storage battery to supply power, and enabling the sensor to enter a low-frequency mode (1 time/minute);
(2) Dynamically adjusting the wake-up period of the sensor by a Pulse Width Modulation (PWM) technology, wherein the sampling interval is automatically adjusted within the range of 5 minutes to 30 minutes according to the current value, the sampling interval is inversely proportional to the current value, the sleep/wake-up time of the sensor is controlled by adjusting the pulse duty ratio, and the interval is prolonged by 5 minutes when the current value is reduced by 5A;
(3) The spare storage battery has a capacity of more than or equal to 500 mAh and can continuously work for more than or equal to 4 hours when the current is less than or equal to 10A.
Preferably, the standardized aviation plug is provided with an anti-misplug locating pin, the contact resistance after the plug is inserted is less than or equal to 50m omega, and the plug life is more than or equal to 500 times.
Preferably, the thickness of a copper foil shielding layer arranged in the wireless three-phase temperature sensor is 50+/-5 mu m, the shielding efficiency is more than or equal to 90 dB@1GHz, and a 0.2 mm polytetrafluoroethylene insulating interlayer is arranged between the copper foil shielding layer and a probe packaging layer.
The invention also provides a small load current adapting method which is applied to the temperature measuring system described in any one of the above, and is characterized by comprising the following steps:
(a) Monitoring the current of the cable in real time, and starting a main power supply and high-frequency sampling mode when the current is more than or equal to 20A;
(b) Switching to a standby battery power supply when the current < 20A, turning off the non-core circuit and enabling the low frequency sampling mode;
(c) When the electric quantity of the storage battery is less than or equal to 20%, triggering an on-site terminal audible and visual alarm and uploading a low-electric quantity early warning to a background system.
The invention further provides an installation method of the temperature measurement system, which is characterized by comprising the following steps:
(a) The pre-integrated debugging of the temperature measuring module, the host module and the gateway of the Internet of things is completed under the high temperature of 85 ℃ and the electromagnetic interference environment of 100V/m before leaving the factory, and the temperature measuring precision is verified to be +/-0.3 ℃ and the communication packet loss rate is less than 0.1%;
(b) When in field installation, the probe of the temperature measuring module is aligned with the insulation gap between the cable head and the sleeve and is fixed through the DIN guide rail, and the deployment error of the probe is less than or equal to +/-0.5 mm;
(c) Triggering a self-checking program after connecting the aviation plug, and checking the communication link, the power state and the module compatibility;
(d) And (3) performing zero calibration by taking 25 ℃ as a reference after power-on, wherein the calibration error is less than or equal to +/-0.3 ℃.
The invention has the beneficial effects that:
1. Accurately capturing early fault temperature rise:
The temperature measuring probe is arranged in the insulation gap (less than or equal to 2mm from the discharge point) between the cable head and the sleeve, the temperature of a fault core area is directly measured, the defect that the existing infrared temperature measurement only measures the surface temperature is overcome, the tiny temperature rise (such as 0.5 ℃ per hour temperature rise rate early warning) caused by partial discharge can be found in advance, and the insulation breakdown expansion fault is avoided.
The temperature measuring probe is packaged by polyimide/silicone rubber with the temperature resistance of 150 ℃ and the insulation grade of more than or equal to 20kV, and the response speed is improved by combining with heat conduction silicone grease, so that long-term stable measurement in a high-pressure and high-temperature environment is ensured, and the measurement precision reaches +/-0.3 ℃ after calibration.
2. The anti-interference and stability are strong:
The built-in electromagnetic shielding design (copper foil layer) and the frequency hopping anti-interference technology (2.4 GHz wireless communication) support AES-256 encryption, ensure the stability and the safety of data transmission, and are suitable for complex electromagnetic environments. The ZigBee protocol is adopted to realize low-power consumption wireless communication among devices, and the local interaction of Modbus 485 serial ports is combined, so that the stability and compatibility of data transmission under a complex electromagnetic environment are ensured, and seamless butt joint with the existing power distribution network system is supported.
3. Prefabrication and rapid deployment:
and each module is integrated and debugged before delivery, and is installed by adopting a standardized aviation plug interface and a DIN guide rail, so that the on-site power-on self-test is only needed, complex wiring or professional training is not needed, and the installation efficiency is obviously improved.
4. And (3) reliably monitoring a small load scene and managing low power consumption:
the power module integrates a standby storage battery (the capacity of the standby storage battery can meet the requirement of 4 hours or more under a small load scene) and a current threshold self-adaptive algorithm, when the current is less than 20A, a low-frequency sampling mode is automatically switched (1 time/min), a wake-up period is dynamically adjusted through a PWM technology (pulse width modulation) technology, the small load scene works continuously for 4 hours or more, the power consumption is reduced by 80%, and the problem that the existing sensor cannot be activated under low current is solved.
5. Intelligent monitoring and Gao Xiaoyun dimensions:
The on-site monitoring terminal displays the temperature thermodynamic diagram in real time, supports over-temperature grading alarm (green at less than or equal to 60 ℃, yellow flickering at 60-80 ℃ and red buzzing at more than or equal to 80 ℃) to visually present the super Wen Jiedian, stores 30-day historical data and generates a temperature rise trend report, supports time axis query (precision 0.1 ℃ per pixel), replaces manual recording analysis, and improves the inspection efficiency.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a temperature measurement system of a full-insulation ring main unit sleeve side prefabricated temperature measurement system and a small load current adaptation method of the invention;
FIG. 2 is a flow chart of a hierarchical architecture of a temperature measurement system of the full-insulation ring main unit sleeve side prefabricated temperature measurement system and a small load current adaptation method of the invention;
FIG. 3 is a flow chart of the temperature measurement system installation of the full-insulation ring main unit sleeve side prefabricated temperature measurement system and the small load current adaptation method of the invention;
FIG. 4 is a graph showing the thermal effect of the temperature of the in-situ monitoring terminal of the fully insulated ring main unit bushing side prefabricated temperature measurement system and the small load current adaptation method of the invention;
FIG. 5 is a diagram of a dynamic power management state machine of the full-insulation ring main unit sleeve side prefabricated temperature measurement system and the small load current adaptation method of the invention.
FIG. 1 shows that a temperature measurement module (wireless three-phase temperature sensor) is communicated with a host module through a ZigBee protocol, an Internet of things gateway is connected to local equipment through a Modbus 485 serial port or a wireless mode and is connected to a fusion terminal or a background system through a WIFI/Ethernet, in FIG. 4, in a BUS switching equipment single line diagram, a BUS (horizontal thick solid line) is marked with "BUS", a sleeve (vertical rectangle) is marked with "sleeve A", "sleeve B", "sleeve C", a cable head connecting point (round node) is marked with numbers N1 (A phase), N2 (B phase) and N3 (C phase), and N1 is marked with a solid circle [ ]Normal), N2 marks with a blinking circleEarly warning at 65 ℃ and marking a solid scintillation circle with N3Alarm at 85 ℃).
Detailed Description
Referring to fig. 1-5, the system of the present invention comprises:
(a) The temperature measurement module comprises a wireless three-phase temperature sensor, the distance between a probe and a discharge point is less than or equal to 2mm, the contact surface is coated with heat conduction silicone grease (the thickness is 0.2 mm +/-0.05 mm), the packaging material is polyimide or silicone rubber and is internally provided with a copper foil shielding layer, the packaging material is deployed in an insulation gap between a cable head and a sleeve, the temperature measurement range is-20 ℃ to 150 ℃, the temperature resistance of the sensor packaging material is more than or equal to 150 ℃ and the insulation grade is more than or equal to 20 kV, and 2.4GHz wireless communication is supported;
(b) The host module is fixed in the ring main unit through a DIN guide rail, a linear fitting temperature rise rate analysis algorithm based on continuous sampling values is built in, the algorithm calculates a temperature rise slope k= (T n-t1)/(nDeltat) through a least square method, a warning mechanism is triggered when k is more than or equal to 0.5 ℃ per hour, T n is the nth sampling temperature, deltat is a sampling interval, and an environmental temperature compensation factor alpha=0.02× (T_env/30) is introduced to correct environmental temperature fluctuation interference, wherein T_env is a real-time environmental temperature value;
(c) The gateway module of the internet of things is in communication connection with the host module and supports Modbus 485 serial port, 2.4GHz wireless communication and WIFI/Ethernet data transmission;
(d) The on-site monitoring terminal displays three-phase temperature thermodynamic diagrams and overtemperature alarm information in real time, and is provided with an overtemperature grading alarm function, wherein the temperature is less than or equal to 60 ℃ and is green, the temperature is 60-80 ℃ and is yellow, the temperature is more than or equal to 80 ℃ and red, the alarm is carried out in a buzzing way, 30-day historical data storage and temperature rising trend analysis are supported, and the data compression rate is more than or equal to 50%;
(e) The power module integrates a main power supply and a standby storage battery, is provided with an energy management algorithm, enables a high-frequency sampling mode (1 time/10 seconds) when the current is more than or equal to 20A, and is switched to the standby storage battery to supply power and enables a low-frequency sampling mode (1 time/minute) when the current is less than 20A;
(f) The modules are subjected to pre-integrated debugging before leaving the factory, plug-and-play is realized through a standardized aviation plug with an anti-misplug locating pin and a DIN guide rail, a built-in self-checking program is automatically triggered after the host module is electrified, and the self-checking program automatically checks a communication link, a power supply state and module compatibility.
The small load current adapting method of the invention comprises the following steps:
(a) Monitoring the current of the cable in real time, and starting a main power supply and high-frequency sampling mode when the current is more than or equal to 20A;
(b) Switching to a standby battery power supply when the current < 20A, turning off the non-core circuit and enabling the low frequency sampling mode;
(c) When the electric quantity of the storage battery is less than or equal to 20%, triggering an on-site terminal audible and visual alarm and uploading a low-electric quantity early warning to a background system.
The installation method of the invention comprises the following steps:
(a) The pre-integrated debugging of the temperature measuring module, the host module and the gateway of the Internet of things is completed under the high temperature of 85 ℃ and the electromagnetic interference environment of 100V/m before leaving the factory, and the temperature measuring precision is verified to be +/-0.3 ℃ and the communication packet loss rate is less than 0.1%;
(b) When in field installation, the probe of the temperature measuring module is aligned with the insulation gap between the cable head and the sleeve and is fixed through the DIN guide rail, and the deployment error of the probe is less than or equal to +/-0.5 mm;
(c) Triggering a self-checking program after connecting the aviation plug, and checking the communication link, the power state and the module compatibility;
(d) And (3) performing zero calibration by taking 25 ℃ as a reference after power-on, wherein the calibration error is less than or equal to +/-0.3 ℃.
The sleeve is a 10kV sleeve, the sleeve body is made of an insulating material, the inside of the sleeve body penetrates through a conductive core (a high-voltage conductor for transmitting power frequency current), and the outside of the sleeve body is an epoxy resin or silicon rubber insulating sheath. An insulation gap (width is 2-3 mm) exists at the joint of the sleeve and the cable head, and a temperature measuring probe is designed to be directly deployed in a core area with partial discharge and abnormal temperature rise. A main capacitor C1:12pF < C1<16pF (sleeve body capacitor reflecting main insulation state), and an end screen capacitor C2:21pF < C2<25pF (end screen grounding capacitor for monitoring auxiliary parameters by partial discharge).
Temperature probe:
The deployment position is that the distance from the discharge point (the edge of the contact surface of the conductive core and the sleeve) in the insulation gap is less than or equal to 2mm, so that the temperature of a discharge heating source is ensured to be directly measured;
the heat conduction design is that the contact surface of the probe and the sleeve is coated with heat conduction silicone grease (the thickness is 0.2mm plus or minus 0.05 mm), the thermal resistance is less than or equal to 1.5K cm < 2 >/W, and the temperature response speed is improved (< 10 seconds);
the packaging material is polyimide or silicon rubber with the temperature resistance of 150 ℃, the insulation grade is more than or equal to 25kV (the safety margin higher than the rated voltage of a sleeve by 10 kV), a copper foil shielding layer is arranged in the packaging material (the thickness is more than or equal to 50 mu m, the shielding efficiency is more than or equal to 90dB@1GHz frequency band), and electromagnetic interference is inhibited.
The working process of the invention comprises the following steps:
the invention discloses a full-insulation ring main unit sleeve side prefabricated temperature measuring system and a small load current adapting method, which are described with reference to the accompanying drawings in the working process.
Embodiment one temperature measurement application of 10kV all-insulation ring main unit sleeve
1. System deployment
The temperature measurement module is used for:
the relevant parameters of the wireless three-phase temperature sensor are as follows:
the technical type is electronic
Size length width depth (mm) 18.5.65.3.78.2
The measurement temperature range is-20 ℃ to 150 ℃
Protection grade IP40, IK07
Communication protocol, wireless, 2.4GHz
220V AC + -20%, 380V AC + -20%, 24V DC + -20%
And 1 wireless three-phase temperature sensor is respectively arranged in the insulation gaps between the A/B/C three-phase sleeve pipe and the cable head of the ring main unit, the DIN guide rail is adopted to be fixed beside the sleeve pipe, the probe is 1.5mm away from the discharge point, the contact surface is coated with heat-conducting silicone grease, the packaging material is silicone rubber with the temperature resistance of 150 ℃, and the insulation grade is 25kV.
The sensor is powered by self-electricity (main power supply) through the induction of cable current by the miniature current transformer, and a 500mAh standby storage battery is arranged in the sensor.
And (3) a host module:
the temperature data are received in real time by connecting the three-phase sensor through an aviation plug through a 35mm DIN guide rail arranged in a cable chamber (the high frequency mode is carried out for 1 time/10 seconds, and the current is more than or equal to 20A).
Built-in temperature rise rate algorithm:
the temperature rise rate algorithm is exemplified by a slope k= (t n-t1)/(nΔt), if k is greater than or equal to 0.5 ℃ per hour triggering early warning (t n is the nth sampling temperature, Δt is the sampling interval).
And (3) carrying out linear fitting on continuous sampling values (such as t 1=25℃,t2=25.3℃,t3 =25.6 ℃), calculating a slope k= (25.6-25)/2 hours=0.3 ℃ per hour (the early warning threshold is not reached), and triggering a first-stage early warning and uploading a background if k is more than or equal to 0.5 ℃ per hour (such as 0.6 ℃ in 1 hour).
Gateway module of Internet of things:
the gateway related parameters of the internet of things are as follows:
DC12-48V power supply
Average power of 4.3W
Protection class IP40
Wireless communication, WIFI-2.4GHz, local wireless network
Ethernet interface Ethernet 10/100 Mbit/s
The method is mainly applied to data acquisition and uploading of local equipment, provides support for data transmission of the whole system, supports Modbus485 serial communication and ZigBee protocol (meeting IEEE 802.15.4 standard), realizes local data interaction and wireless networking with a temperature measurement module, and simultaneously transmits data upwards to a background system through WIFI or Ethernet, and can be connected with a mobile phone terminal debugging applet through Bluetooth for debugging management.
The system is arranged in a secondary cell in a split mode, is connected with a host module through a shielding cable (delay is 150 ms), supports WIFI to access a local area network of the station, transmits temperature data encryption (AES-256) to a background system, and is connected with an operation and maintenance mobile phone end through Bluetooth to realize remote parameter configuration.
The temperature measuring module is in wireless communication with the temperature measuring module through a ZigBee protocol (2.4 GHz frequency band), data transmission delay is less than or equal to 200ms, and the temperature measuring module is connected with the local monitoring terminal through a Modbus 485 serial port or Bluetooth, so that the stability of local data interaction is ensured.
Monitoring terminal in place:
The device is arranged on a ring main unit panel, a bus single line diagram is displayed, green (normal) is displayed when the temperature of A phase is 20 ℃, yellow flash (primary early warning) is displayed when the temperature of B phase is 65 ℃, red and buzzing alarm (secondary early warning, trip setting can be performed) are displayed when the temperature of C phase is 85 ℃, meanwhile, a thermodynamic diagram is marked for over Wen Jiedian, data of the last 30 days are stored, and a history curve (such as 0.1 ℃ per pixel of temperature rise curve precision within 1 hour) of a certain period can be queried.
And a power supply module:
And inputting a 220V AC main power supply, switching to a standby storage battery for supplying power when detecting the current 15A (lasting 5 minutes < 20A), enabling the sensor to enter a low-frequency mode (1 time/minute), closing a non-core circuit (such as a screen backlight), and dynamically adjusting the sampling interval to 10 minutes (current 15A) according to the current.
2. Workflow process
Normal load (current > 20A):
Sensor high frequency sampling (1 time/10 seconds), host computer real-time calculation of temperature rise slope, uploading data to a background and a local terminal through a gateway, and green display of normal temperature of the terminal.
Small load (current < 20A):
triggering the power supply of a storage battery, sampling at low frequency (1 time/min), waking up at intervals of 10 minutes, checking the data integrity of a host every 5 minutes, reducing the power consumption to 20% of a normal mode, and continuously working for 4.5 hours.
Overtemperature early warning:
When the temperature of a certain phase is 75 ℃ (60 ℃ -80 ℃), the terminal flashes yellow and records an alarm, when the temperature is 85 ℃, the alarm is displayed in red and triggered, and meanwhile, a tripping signal is sent to the background.
3. Mounting step
The installation flow of the fully-insulated ring main unit sleeve side prefabricated temperature measurement system follows three stages of factory pre-integration, field rapid butt joint and self-checking activation, and the method specifically comprises the following steps:
3.1 Pre-Integrated debug before delivery
The integrated debugging of the temperature measurement module (wireless three-phase temperature sensor), the host module and the gateway module of the Internet of things is completed in the production stage, wherein the sensor is pre-fixed with the host module through a 35mm DIN guide rail, the distance is less than or equal to 10cm, the signal transmission delay is less than or equal to 150ms, the aviation plug interface is pre-calibrated, the contact resistance of more than 500 times of plugging is less than or equal to 50mΩ, the test of the 10kV ring main unit operation environment (the temperature is 85 ℃ and the electromagnetic interference intensity is less than or equal to 100V/m) is simulated, and the temperature measurement precision (error +/-0.3 ℃) and the communication stability (the packet loss rate is less than 0.1%) are verified.
3.2 Field hardware deployment
And (3) temperature measurement module installation:
The sensor probe is aligned with the insulation gap between the cable head and the sleeve, is fastened and fixed beside the sleeve (the distance from the discharge point is less than or equal to 2mm and the error is +/-0.5 mm) through the DIN guide rail, the contact surface is coated with heat conduction silicone grease (the thickness is 0.2mm +/-0.05 mm), the heat resistance is ensured to be less than or equal to 1.5K cm < 2 >/W, the sensor shell is packaged by adopting silicon rubber with the temperature resistance of 150 ℃, the insulation grade is more than or equal to 25kV, and the requirement of DL/T5352-2018 on high-voltage insulation is met.
The host module is fixed:
the host module is arranged on the side wall of the cable chamber or the secondary chamber through a 35mm DIN guide rail, the horizontal distance from the host module to the temperature measuring module is less than or equal to 50cm, and the interference of a strong electromagnetic field (such as the periphery of a lightning arrester and a reactor is 1m away) is avoided.
3.3 Fast interface docking
And (3) electric connection:
The temperature measuring module is connected with the host module by adopting a standardized aviation plug (8-core shielding type), the plug is provided with an anti-misplug locating pin, a self-checking program of the host module is automatically triggered after the plug is inserted, the gateway module of the Internet of things is connected with the host module by a shielding cable (the outer layer is coated with flame-retardant polyvinyl chloride, the coverage rate of the shielding layer is more than or equal to 95 percent), and the cable length is prefabricated according to the size of the ring main unit (error +/-5 cm).
And (3) power supply access:
the wide voltage input of 220V AC plus or minus 20 percent/24V DC plus or minus 20 percent is supported, the power supply between cabinets is connected through the anti-drop terminal, and the polarity reverse connection protection circuit can bear 10s reverse connection without damage.
3.4 Software configuration and data Link establishment
Bluetooth rapid pairing:
The operation and maintenance personnel start Bluetooth through a mobile phone end debugging applet (supporting Android 10.0+/iOS 14.0+), search and connect an Internet of things gateway (device name prefix' TMS- "+cabinet number), and automatically synchronize a temperature measuring module ID and communication parameters;
And supporting two-dimension code scanning pairing (optional function), namely scanning a two-dimension code (comprising an equipment serial number and a firmware version) on the surface of the host module, and completing identity authentication within 10 seconds.
Monitoring in place terminal initialization:
the terminal screen displays a bus single line diagram, automatically identifies the positions of three-phase bushings (A/B/C phases correspond to left/middle/right nodes respectively), defaults to an overtemperature threshold, namely green is less than or equal to 60 ℃, yellow is 60-80 ℃, and red is more than or equal to 80 ℃ (which can be defined by a background system).
3.5 Power-on self-test and system activation
After the main power supply is connected, the built-in self-checking program of the host module is checked in sequence:
① Temperature measurement module supply voltage (24V DC + -20%);
② ZigBee wireless signal intensity (more than or equal to-70 dBm);
③ Modbus485 serial communication rate (9600 bps by default);
④ Spare battery capacity (initial power is not less than 90%).
After the self-checking is passed, the system is automatically calibrated by taking 25 ℃ as a reference (the calibration error is +/-0.3 ℃), and the whole cabinet is initialized and enters an operating state within 10 minutes.
4. Technical Effect verification
And (3) fault simulation, namely artificially manufacturing partial discharge (discharge quantity is 50 pC) in an insulation gap, detecting temperature rise of 0.8 ℃ per hour within 30 minutes by a sensor, triggering first-stage early warning, and finding abnormality 2 hours earlier than infrared temperature measurement.
And in the power consumption test, under a small load scene (current 10A), the system continuously works for 4.2 hours, the low-power early warning is triggered when the residual capacity of the storage battery is 18%, and the power consumption is reduced by 82% compared with the normal mode.
The installation efficiency is that a 3-person team completes 20 ring main units on a single day, the average time is 10 minutes/cabinet, the efficiency is improved by 15 times compared with the traditional scheme (2 hours/cabinet), and the labor cost and the debugging error are obviously reduced.
According to the embodiment, through cooperation of accurate temperature measurement, prefabricated installation, intelligent power consumption management and a multi-stage early warning mechanism, real-time and reliable monitoring of the ring main unit sleeve side temperature is achieved, the defects of the prior art in aspects of measurement accuracy, installation complexity, small load adaptability and the like are effectively overcome, and an efficient solution is provided for intelligent operation and maintenance of the power distribution network.
Comparative example Ring main unit temperature measurement System deployment
1. Module mounting
And the temperature measurement module is used for fixing the wireless three-phase temperature sensor in an insulation gap between the cable head and the sleeve through the DIN guide rail, so that the contact surface of the sensor is ensured to be coated with heat-conducting silicone grease, and the deployment error is controlled within +/-0.5 mm. The temperature measuring probe is packaged by silicon rubber, the temperature resistance is 150 ℃, the insulation grade is more than or equal to 25kV, the packaging thickness is 2mm, and the test is passed by GB/T16927.1-2011 standard.
The host module is arranged on the DIN guide rail of the cable room, is connected with the gateway of the Internet of things through a shielding cable, triggers a self-checking program after being electrified, and checks the states of the communication link and the power supply.
And the on-site monitoring terminal is arranged on the bus switching equipment, displays a single line diagram and three-phase temperature, and calibrates the reference temperature to 25 ℃ (the error is less than or equal to +/-0.3 ℃).
2. Parameter configuration
The mobile phone terminal debugging program is connected through Bluetooth, an overtemperature threshold (such as 80 ℃ triggering red alarm), sampling frequency (dynamically adjusted for 5-30 minutes) and communication protocol (2.4 GHz or Ethernet is selected) are set.
3. Running test
And (3) simulating a scene with load current of more than 20 and A, verifying the real-time performance of data in a high-frequency sampling mode (1 time/10 seconds), and observing the power supply stability of a standby storage battery and the power consumption of the low-frequency sampling mode when the load is switched to a small load (current of <20 and A).
Example 2 fault diagnosis and Pre-alarm
1. Abnormal temperature rise detection
The host module detects that the temperature of a certain phase rises from 60 ℃ to 75 ℃ through a temperature rise rate algorithm (the slope exceeds a set threshold value), triggers the yellow flashing alarm of the on-site terminal, and simultaneously uploads data to the background system through the gateway of the Internet of things.
2. Edge calculation analysis
The on-site monitoring terminal calls historical data (30 days of compressed storage), analyzes the temperature rise trend of the node as accelerating rise, predicts that the temperature rise trend possibly reaches an 80 ℃ overtemperature threshold within 2 hours after being corrected by combining with the fluctuation of the environmental temperature, and pushes early warning to operation and maintenance personnel in advance.
3. Remote linkage processing
The background system receives low-power early warning (the storage battery is less than or equal to 20%) and overtemperature warning through an MQTT protocol, automatically generates a work order, schedules inspection, and ensures that the instruction transmission delay is less than 1 second by combining a gateway frequency hopping technology.
The conclusion is that the prefabricated temperature measurement system of the sleeve side of the all-insulated ring main unit solves the problems of low precision, complex installation, small load failure and the like of the traditional scheme through modular design, self-adaptive energy management and intelligent analysis, remarkably improves the operation and maintenance efficiency and reliability of the power distribution network, and is suitable for the upgrading of intelligent power grids and the reconstruction of old equipment.
Compared with a handheld infrared temperature measurement scheme and a bundling type cable head temperature measurement scheme, the full-insulation ring main unit sleeve side prefabricated temperature measurement scheme can directly measure the temperature change of the key point sleeve side, if an insulation gap exists between the cable head and the sleeve, the phenomena of discharging, partial discharging and aging are generated in operation, the temperature rise trend can be timely and accurately observed, and the temperature rise trend is processed in advance. Compared with the infrared technology, the electronic type measuring technology is less affected by the field environment, the measuring data is directly displayed as the temperature value, the field personnel are not required to carry out professional measuring training, and the application is more convenient.
The prefabricated temperature measurement ex-factory is about to install and debug sensors, hosts, gateways of the internet of things and the like, and compared with other temperature measurement schemes, the prefabricated temperature measurement ex-factory is complex in field installation and pairing work, and other fault phenomena or false measurement and other conditions can be caused by the fact that the prefabricated temperature measurement ex-factory is not in place, the prefabricated temperature measurement ex-factory can be used directly, and the prefabricated temperature measurement ex-factory is more convenient. And the integrated and related test is carried out before delivery, so that the operation risk caused by the fact that the site installation is not in place is avoided. For the situation under the small load application scene, most temperature measuring sensors need to induce current to activate the application of the temperature measuring sensors, and the influence caused by untimely data measurement can be caused.
Other temperature measurement schemes such as nut type temperature measurement are used by being matched with related cable heads, the installation angle is more complex, the bundling type temperature measurement also needs to be installed on site, and the prefabricated temperature measurement scheme has higher cost performance from the viewpoint of comprehensive cost. The handheld infrared temperature measurement scheme is more complicated in temperature data information recording, comparison and analysis and is matched with an on-site monitoring terminal, temperature data can be displayed in real time and uploaded to a background, the temperature rise condition can be judged through historical data recording and change trend, and the operation and maintenance working efficiency of operation and inspection personnel is further improved.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (7)
1. The full-insulation ring main unit sleeve side prefabricated temperature measurement system is characterized by comprising:
The temperature measurement module comprises a wireless three-phase temperature sensor, the distance between a probe and a discharge point is less than or equal to 2 mm, the contact surface is coated with heat conduction silicone grease with a preset thickness, the packaging material is a high-temperature resistant insulating material and is internally provided with an electromagnetic shielding layer, the electromagnetic shielding layer is deployed in an insulating gap between the cable head and the sleeve, and the temperature resistance grade and the insulating grade of the packaging material are adapted to the running environment of the ring main unit and support 2.4GHz wireless communication;
The host module is fixed in the ring main unit through a DIN guide rail, a temperature rise rate analysis algorithm is built in, a least square method is adopted to calculate a temperature rise slope, an early warning mechanism is triggered when the slope is more than or equal to 0.5 ℃ per hour, and an environmental temperature compensation factor is introduced to correct errors;
The gateway module of the internet of things is in communication connection with the host module and supports various data transmission modes;
The on-site monitoring terminal displays three-phase temperature thermodynamic diagrams and overtemperature alarm information in real time, configures an overtemperature grading alarm function and supports historical data storage and temperature rise trend analysis;
The power module integrates a main power supply and a standby storage battery, is provided with an energy management algorithm, and automatically switches a power supply mode and a sampling frequency according to the current of the cable;
the modules are subjected to pre-integrated debugging before leaving the factory, plug-and-play is realized through a standardized aviation plug with an anti-misplug locating pin and a DIN guide rail, a built-in self-checking program is automatically triggered after the host module is electrified, and the self-checking program automatically checks a communication link, a power supply state and module compatibility.
2. The full-insulation ring main unit sleeve side prefabricated temperature measurement system of claim 1, wherein the wireless three-phase temperature sensor is integrated with a miniature current transformer, self-powered through induced cable current and internally provided with a standby storage battery.
3. The system for prefabricating temperature measurement on the sleeve side of the all-insulated ring main unit according to claim 1, wherein the gateway module of the Internet of things supports a Bluetooth connection debugging program, establishes a data link in a rapid pairing mode, and embeds encryption and anti-interference technologies.
4. The fully insulated ring main unit bushing side prefabricated temperature measurement system according to claim 1, wherein:
The energy management algorithm comprises the steps of enabling a main power supply and a high-frequency sampling mode when the current is more than or equal to 20A, and switching to a standby storage battery power supply and enabling a low-frequency sampling mode when the current is less than 20A.
5. The prefabricated temperature measurement system of the sleeve side of the all-insulated ring main unit according to claim 1, wherein the standardized aviation plug is provided with an anti-misplug locating pin, the contact resistance after the insertion is less than or equal to 50 m Ω, and the plugging life is more than or equal to 500 times.
6. A small load current adaptation method applied to the temperature measuring system of any one of claims 1-5, comprising the steps of:
(a) Monitoring the current of the cable in real time, and starting a main power supply and high-frequency sampling mode when the current is more than or equal to 20A;
(b) Switching to a standby battery power supply when the current < 20A, turning off the non-core circuit and enabling the low frequency sampling mode;
(c) When the electric quantity of the storage battery is less than or equal to 20%, triggering an on-site terminal audible and visual alarm and uploading a low-electric quantity early warning to a background system.
7. A method of installing a thermometry system of any of claims 1-5, comprising:
(a) Before leaving the factory, the module is pre-integrated and debugged in a high-temperature electromagnetic interference environment, and the temperature measurement precision and the communication stability are verified;
(b) When in field installation, the temperature measuring module probe is aligned with the insulation gap and fixed, and the installation position of the host module meets the signal transmission requirement;
(c) Triggering a self-checking program after connecting the aviation plug, and checking the communication link, the power state and the module compatibility;
(d) Zero calibration is performed after power-on.
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Application publication date: 20250627 |