ST-800W Series Online Wireless Temperature Measurement System

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ST-800W Series Online Wireless Temperature Measurement System [Copy link]

ST-800W Series Online Wireless Temperature Measurement System

□ Overview

The ST800W series is a complete set of advanced and practical online temperature monitoring devices for electrical contacts of high-voltage switchgear. The key component SW-610 wireless temperature measurement module adopts our company's patented technology (ZL201320065916.6), draws power through the high-voltage electric field, and is battery-free. It completely solves the disadvantage of the ordinary wireless temperature measurement system that requires regular power outages to replace batteries. At the same time, it avoids the wireless temperature measurement system that uses current transformers to draw power , which has strict requirements on the load current range (the current is too small to work, and the current is too large to damage the equipment). The SW-610 type only needs power from the high-voltage system, regardless of the load current. There is also a SW-600 wireless temperature measurement module with a battery design for users to choose according to their needs. The temperature measurement component of the device is installed near the connection point where the current-carrying conductor of the high-voltage switch is prone to temperature rise, and the temperature sensor signal installed at the high-potential end can be isolated and transmitted to the instrument at the low-potential end through wireless data transmission. For removable switchgear, you only need to install the sensor module on the side of the handcart, which is very convenient for installation, modification and maintenance. It adopts a strap-type installation method, which is easy to install. The display instrument of the device is also equipped with a temperature sensor inside the cabinet, which can display the relative temperature rise of the hot spot. The application of this device provides an effective monitoring means to solve the 11.7 "Preventing overheating of the current-carrying circuit of the switchgear" in the "18 Measures for Major Power Grid Accidents of the State Grid Corporation".

□Product advantages:

◆Battery-free design, no need for regular battery maintenance, strap-type installation, simple and convenient to use and maintain; there is also a battery design for users to choose.

◆2.4G frequency band, no need for authorization, no need for application registration, fast communication speed

◆GPRS/3G function can be selected to reduce the dependence on the network environment

◆For power distribution cabinets, we also provide environmental temperature and humidity detection to facilitate system temperature rise judgment

◆Powerful and easy-to-use monitoring platform software, supporting mainstream industry configuration software

□Wireless temperature measurement system

The wireless temperature measurement system uses automation control, computer communication, network information and other technologies to form a dedicated wireless network based on existing mature wireless solutions. Designed for special high-voltage system application scenarios, it monitors the temperature rise status of the electrical switch breakpoints and busbar joints of the distribution cabinet in real time. Based on standard RS485/Modbus communication, this system sends data to the local distribution station and remote dispatch room as well as portable terminals or mobile terminals, so that users can check the equipment status at any time and handle abnormal situations and alarms in a timely manner.

A complete wireless temperature measurement system consists of the following parts:

◆Wireless temperature measurement transmitter module based on electric field power or wireless temperature measurement transmitter module with battery

◆Wireless receiving module

◆Temperature display control device

◆Serial communication data acquisition system based on RS485

◆Configuration system software

□Electric field power wireless temperature measurement technology

Considering the low power consumption of wireless temperature measurement and the high electric field strength of the high-voltage system, which facilitates the extraction of energy from the electric field, Time Domain Electronics has designed and developed a wireless temperature measurement system that draws power from the electric field based on its own patented technology (ZL201320065916.6), which completely solves the power supply problem of the wireless temperature measurement system.

□Wireless temperature measurement transmitter module

◆ SW-610B is installed by strap, SW-600 has two installation methods: strap and guide rail.

◆Waterproof design: SW-610B IP67

◆Intelligent transmission: Automatically adjust the transmission frequency according to the electric field strength Random delay to avoid wireless conflicts

□Wireless receiving module

◆RS485 interface

◆High sensitivity design

◆Standard rail installation

◆Automatic protocol identification and conversion

◆Transmission mode: Differential

◆Transmission medium: twisted pair

◆Maximum communication distance: 1200M

◆ Maximum and minimum common mode voltage: +12V; -7V

◆Differential input range: -7V～+12V

◆Receiver input sensitivity: ±200mV

◆Receiver input impedance: ≥12kΩ

□Online temperature monitoring device

◆Communication interface 1: wireless receiving module

◆Communication interface 2: Uplink computer network

◆Automatic identification of wireless transmitter module ID

◆LCD display

◆Alarm (trip) passive output

◆One working output (optional)

◆ At the same time, the ambient temperature of the switch cabinet can be monitored

□Monitoring system platform function

◆Own monitoring platform, and support third-party monitoring platform (configuration software)

◆Real-time data information

◆Query historical data information

◆Data chart or curve display

◆Data analysis, notify administrators of abnormal situations

◆Event handling

◆Remote control: The administrator can remotely control the opening and closing of the circuit breaker in an emergency

◆System management function

◆Database component separation, read-write separation, improve data processing capabilities

□Monitoring platform advantages

◆Data centralized storage management

◆Easy browsing and access

◆Reduce input costs

◆Strong scalability

◆Easy maintenance

□Communication technology

◆Wireless frequency band: 2.4G ISM band (Industrial Scientific Medical Band), no authorization and registration required.

◆Wireless networking: Star network has its own unique advantages among many networking forms: one-hop transmission, high reliability, and high signal utilization.

◆Uplink interface: RS485 ring or tree network, long transmission distance, strong anti-interference ability, lightning protection design, Modbus standard.

◆Receiving module interface: RS485 with strong anti-interference ability.

□Technical parameters:

◆ Temperature measurement range: -30~150℃ Accuracy: ±1.5% FS

◆ Temperature sensor: High-precision, high-temperature thermistor imported from Japan.

◆ Applicable types of switchgear: The models and specifications of switchgear currently available on the market are generally applicable, and different installation methods can be configured according to the equipment structure.

◆ Wireless communication frequency: 2.4GHz Transmitting power: <10mW

◆Communication interface: RS485 MODBUS protocol　

◆ Power supply and power consumption of display instrument: AC220V±15% ≤5W

◆ Power supply mode of temperature sensor module:

◇SW-610 type: It is powered by high-voltage electric field, no battery is needed, it can work as long as there is electricity, and it has nothing to do with the line load current.

◇SW-600 model: battery powered, the battery needs to be replaced when the time limit expires.

◆ Over-temperature alarm output: Passive normally open, contact capacity: resistive load 7A

◆ High temperature exhaust output: Passive normally open, contact capacity: resistive load 7A

◆Installation method and dimensions:

◇SW-610 wireless temperature sensor: strap installation;

Strap length 350mm Sensor 45×45mm

◇SS-600 wireless receiving module: rail mounted or embedded in online temperature control device

Dimensions: 65×45×28mm

◇ST-801W temperature control device: embedded installation,

Overall dimensions: 100×100×92.5mm Opening size: 96×96mm

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