Passive wireless temperature monitoring system for high-voltage switch cabinet

Abstract

The utility model discloses a passive wireless temperature monitoring system for a high-voltage switch cabinet, which relates to the high-voltage equipment on-line monitoring technology and comprises one or more radar type temperature sensors, a data acquisition unit and a diagnosis unit. The radar type temperature sensors are distributed on a moving contact of the high-voltage switch cabinet, a busbar of the high-voltage switch cabinet and / or an inlet cable joint through fixing devices and are used for acquiring temperature signals of key nodes of the high-voltage switch cabinet; the data acquisition unit is fixedly arranged in an instrument room of the high-voltage switch cabinet and is used for acquiring temperature signals of key nodes of the high-voltage switch cabinet. The data acquisition unit sends ultrahigh frequency electromagnetic waves for acquiring temperature information to activate the radar type temperature sensor to acquire the temperature information, then receives the returned temperature information and uploads the temperature information to the diagnosis unit. According to the utility model, the characteristics of integration and miniaturization of the radar radio frequency chip are fully exerted, the system can adapt to different application scenes, and accurate temperature on-line monitoring is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage equipment on -line monitoring technology especially a kind of passive wireless temperature monitoring system of high voltage switchgear. BACKGROUND

[0002] In large power cabinet such as high-voltage substation, the phenomenon of damage caused by power cable aging, heating and other conditions is one of the reasons for large-scale economic losses. Therefore, high-voltage power equipment needs to set up a temperature detector to monitor the temperature of the equipment, especially the cable connection and other parts in real time. If the temperature monitoring point is in a high-voltage, high-current, strong magnetic field environment, or even in a sealed space, it is easy to encounter strong electromagnetic noise, high-voltage insulation or space limitations and other problems.

[0003] The traditional wireless temperature on-line monitoring technology of electrical equipment is composed of ARM architecture temperature sensor and matched temperature acquisition device, wherein the ARM architecture temperature sensor is composed of MCU / Palladium alloy power device / temperature sensing module / 433MHz radio frequency communication module and other parts.

[0004] The sensor of this technology must actively send radio frequency signals, and the sensor cannot obtain energy from the environment and must rely on battery or external power device. For example, the power device in the patent "CN213027845U wireless temperature measuring device power collection circuit", but the sensor is large in size and cannot be started when the power supply in the power collection circuit is large-scale power failure, and the power collection circuit is easily affected by strong and weak magnetic environment, resulting in space limitations, damage to the surface of the node of the monitored node and other hidden dangers.

[0005] And manual labor inspection has the disadvantages of high labor cost, slow abnormality discovery, and inability to retain and analyze data. INVENTION CONTENTS

[0006] The utility model aims to provide a kind of passive wireless temperature monitoring system of high voltage switchgear, which can not only accurately realize the on-line monitoring of high voltage switchgear node temperature, but also the passive system is more suitable for the temperature monitoring of complex electrical nodes of high voltage switchgear, and the system is more stable, reducing the security risk.

[0007] To achieve the above purpose, the following technical solutions are used:

[0008] A kind of passive wireless temperature monitoring system of high voltage switchgear, comprising one or more radar type temperature sensors, data acquisition unit and diagnostic unit;

[0009] The radar temperature sensor includes a radar radio frequency identification temperature chip and a fixing device. The radar radio frequency identification temperature chip includes a rectifier circuit and a sensor antenna. The radar temperature sensor is distributed and installed on the moving contact of the high-voltage switchgear, on the busbar of the high-voltage switchgear and / or at the incoming cable joint through the fixing device, and is used to collect temperature signals of key nodes of the high-voltage switchgear.

[0010] The data acquisition unit includes a radio frequency communication module and a signal processing module. The data acquisition unit is fixedly installed in the instrument room of the high-voltage switchgear and is used to acquire temperature signals of key nodes of the high-voltage switchgear.

[0011] Furthermore, the fixing device includes a snap-fit ​​structure, a clip structure, or a tuning fork structure.

[0012] The radar temperature sensor also includes a substrate and a flame-retardant encapsulation. The substrate is a ceramic substrate, the sensor antenna is a silver paste patch antenna, and the flame-retardant encapsulation is a flame-retardant plastic encapsulation.

[0013] Furthermore, the data acquisition unit also includes a wireless communication module, a data acquisition antenna, and a housing. The radio frequency communication module, signal processing module, and wireless communication module are encapsulated within the housing, which is made of aluminum alloy.

[0014] Furthermore, the data acquisition antenna is magnetically mounted on the side wall of the high-voltage switchgear compartment and cable compartment.

[0015] Furthermore, the diagnostic unit is configured on the field display terminal or cloud platform for temperature measurement point location calibration, alarm threshold configuration, and equipment status fault diagnosis.

[0016] Furthermore, the radar-type temperature sensor and the intelligent data acquisition unit wirelessly transmit temperature information via the RFID protocol, while the data acquisition unit and the diagnostic unit transmit temperature information via the Modbus protocol.

[0017] The advantages of this utility model are:

[0018] Radar-type temperature sensors do not actively emit signals. Their internal chip has a built-in rectifier circuit that converts the received radio frequency energy into direct current, thus achieving a passive operation without a power source.

[0019] The passive wireless temperature monitoring system based on radar sensing technology combines the precise detection capability of radar with the real-time communication and data processing capability of the Internet of Things. It enables information sensing devices to communicate and exchange information according to the agreed protocol, so as to achieve the purpose of intelligent identification, positioning, tracking, monitoring and management.

[0020] By fully leveraging the integrated and miniaturized features of radar RF chips, and customizing sensor structures, intelligent acquisition terminals, and communication architectures for specific application scenarios, the system can adapt to different application scenarios, achieve accurate online temperature monitoring, effectively improve the temperature monitoring level of key nodes in power equipment, reduce equipment damage and power outages caused by high-temperature faults, enhance the operational reliability of the power system, and provide strong technical support for intelligent operation and maintenance in the power industry. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the passive wireless temperature monitoring system for high-voltage switchgear of this utility model;

[0022] Figure 2 This is a schematic diagram of the radar radio frequency identification communication of this utility model;

[0023] Figure 3 This is a schematic diagram showing the usage status of the clip-on radar temperature sensor of this utility model;

[0024] Figure 4 This is a schematic diagram showing the location distribution of the high-voltage switchgear of this utility model;

[0025] In the diagram, 1-radar temperature sensor, 2-switch cabinet, 3-high voltage chamber, 4-instrument chamber, 5-moving contact, 6-data acquisition unit, 7-data acquisition antenna. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] Example 1

[0028] This embodiment provides a passive wireless temperature monitoring system for high-voltage switchgear, including one or more radar-type temperature sensors, a data acquisition unit, and a back-end diagnostic unit. Please refer to [link / reference needed]. Figure 1 .

[0029] Radar-type temperature sensors are distributed and fixedly installed on the moving contacts, busbars, and / or incoming cable joints of high-voltage switchgear. They consist of a radar RFID temperature chip, a silver paste patch antenna, a ceramic substrate, and a flame-retardant plastic encapsulation. Operating in the 902MHz~928MHz frequency band, they are compatible with the EPC global UHF Class 1 Gen 2 (ISO 18000-6C) protocol, and can measure temperatures from -40℃ to 150℃. The enclosure protection rating is IP55. These radar-type temperature sensors are used to collect temperature signals from critical nodes in high-voltage switchgear. The fixing devices include snap-fit ​​structures, clip structures, or tuning fork structures.

[0030] The perimeter of the snap-on radar temperature sensor does not exceed 16x16mm in length and width. It is fixed to the moving contact of the high-voltage switchgear using a clip structure, and the maximum wireless transmission distance is 3 meters.

[0031] The dimensions of the clip-on radar temperature sensor should not exceed 66x36mm. It is fixed to the moving contact of the high-voltage switchgear using a snap-fit ​​structure. (Refer to...) Figure 3 The maximum wireless transmission distance is 8 meters.

[0032] The tuning fork temperature sensor has an outer length and width of no more than 75x35mm. It is fixed on the busbar of the high-voltage switchgear using a tuning fork structure, and the maximum wireless transmission distance is 8 meters.

[0033] The data acquisition unit is fixedly installed in the instrument room of the high-voltage switchgear and includes an RF communication module, a signal processing module, a wireless communication module, and two data acquisition antennas. The RF communication module, signal processing module, and wireless communication module are encapsulated in an aluminum alloy shell. The two data acquisition antennas operate in the frequency range of 902MHz~928MHz, have a gain of 7dBi, and are circularly polarized. They are magnetically mounted on the side walls of the high-voltage switchgear truck compartment and cable compartment, respectively. Please refer to [reference needed]. Figure 4 The aluminum alloy casing has a length and width not exceeding 120mm x 120mm. It is bolted to the instrument compartment of the high-voltage switchgear and operates by drawing power from the terminal blocks in the instrument compartment. The data acquisition unit is used to collect temperature signals from key nodes of the high-voltage switchgear to control the temperature sensors to transmit the collected temperature information.

[0034] The diagnostic unit is configured on the field display terminal or cloud platform to perform temperature measurement point location calibration, alarm threshold configuration, and equipment status fault diagnosis.

[0035] Example 2

[0036] This embodiment provides a passive wireless temperature monitoring method for high-voltage switchgear. Based on the aforementioned passive wireless temperature monitoring system for high-voltage switchgear, please refer to... Figure 1 , Figure 2 .

[0037] The signal processing module of the data acquisition unit controls the radio frequency communication module to send ultra-high frequency electromagnetic waves to collect temperature information. The radar temperature sensor does not actively emit signals. Its internal chip has a built-in rectifier circuit that converts the received radio frequency energy into DC power, so that it can work without a power supply, thereby realizing the passive activation of the radar temperature sensor to collect temperature information.

[0038] The RF communication module receives temperature information from the radar-type temperature sensor and transmits it to the signal processing module for protocol conversion. The RF communication module is compatible with the EPC global UHF Class 1 Gen 2 (ISO 18000-6C) protocol, operates in the frequency band of 860MHz~960MHz, has a sensitivity of -87dBm, and has adjustable power of 5dBm~30dBm.

[0039] The temperature information is converted into Modbus protocol and uploaded to the diagnostic unit.

[0040] The radar-type temperature sensor and the intelligent data acquisition unit wirelessly transmit temperature information via the RFID protocol, while the data acquisition unit and the diagnostic unit transmit temperature information via the Modbus RTU protocol.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A passive wireless temperature monitoring system for high-voltage switchgear, characterized in that, It includes one or more radar-type temperature sensors, a data acquisition unit, and a diagnostic unit; The radar-type temperature sensor includes a radar radio frequency identification temperature chip and a fixing device. The radar radio frequency identification temperature chip includes a rectifier circuit and a sensor antenna. The radar-type temperature sensor is distributed and installed on the moving contact of the high-voltage switchgear, on the busbar of the high-voltage switchgear and / or at the incoming cable joint through the fixing device, and is used to collect temperature signals of key nodes of the high-voltage switchgear. The data acquisition unit includes a radio frequency communication module and a signal processing module. The data acquisition unit is fixedly installed in the instrument room of the high-voltage switchgear and is used to acquire temperature signals of key nodes of the high-voltage switchgear.

2. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 1, characterized in that, The fixing device includes a snap-fit ​​structure, a clip structure, or a tuning fork structure.

3. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 1, characterized in that, The radar-type temperature sensor also includes a substrate and a flame-retardant encapsulation. The substrate is a ceramic substrate, the sensor antenna is a silver paste patch antenna, and the flame-retardant encapsulation is a flame-retardant plastic encapsulation.

4. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 1, characterized in that, The data acquisition unit also includes a wireless communication module, a data acquisition antenna, and a housing. The radio frequency communication module, the signal processing module, and the wireless communication module are encapsulated within the housing, which is an aluminum alloy housing.

5. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 4, characterized in that, The data acquisition antenna is magnetically mounted on the side wall of the high-voltage switchgear truck compartment and cable compartment.

6. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 1, characterized in that, The diagnostic unit is configured on the field display terminal or cloud platform and is used for temperature measurement point location calibration, alarm threshold configuration, and equipment status fault diagnosis.

7. The passive wireless temperature monitoring system for high-voltage switchgear according to claim 1, characterized in that, The radar-type temperature sensor and the intelligent data acquisition unit wirelessly transmit temperature information via the RFID protocol, while the data acquisition unit and the diagnostic unit transmit temperature information via the Modbus protocol.

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