This product is a new concept wireless temperature measuring device for switch cabinets. It has powerful functions and is suitable for various switch cabinets such as central cabinets, handcart cabinets, fixed cabinets, and ring network cabinets in 3-35KV indoors.
This product adopts the intelligent control of single-chip microcomputer, which can collect the temperature and humidity in the cabinet in real time, and automatically adjust the temperature and humidity environment in the cabinet according to the user's settings. It can be equipped with real-time power parameter information, such as three-phase voltage, current, zero-sequence current, active power, reactive power, apparent power, power factor, frequency, active energy and reactive energy, etc., and can be equipped with real-time monitoring switch Input status signal. This product can be equipped with busbar contact temperature measurement, which can be equipped with 3-point temperature measurement, 6-point temperature measurement, 9-point temperature measurement, 12-point temperature measurement, etc. It can monitor the temperature of the busbar, the upper and lower contacts of the circuit breaker and other contacts in real time. And can set over-temperature alarm output. The RS485 communication interface of this product can make the device and other equipment in the substation form a real-time microcomputer error prevention monitoring system.
This product adopts unique anti-interference design and industrial-grade electronic components, with strong anti-interference ability and high reliability. In addition to the above series of standard configuration products, the company can also customize products with different functional combinations according to user requirements to meet the diverse needs of users.

1. Working voltage: device power supply: AC/DC90-260V.
Load power supply: AC220V±10% 50HZ.
2. Device power consumption: ≤15VA.
3. Dielectric strength: ≥ AC2000V between shell and terminal.
4. Insulation performance: the distance between the shell and the terminal is greater than 100MΩ.
5. Communication: RS485 interface, MODBUS protocol, factory address can be set, baud rate 4800/9600.
6. Temperature and humidity control range: temperature -20°C~125°C, humidity 0%RH~95%RH.
8. Measurement accuracy: temperature ±2°C, humidity ±5%RH.
7. Contact temperature measurement: optional 3-point temperature measurement, 6-point temperature measurement, 9-point temperature measurement, 12-point temperature measurement, etc.
9. Multi-power measurement: measure three-phase voltage, current, power, power factor, frequency, electric energy, etc.
10. Working environment: normal working temperature -20°C-70°C, annual average humidity ≤95%.
11. Anti-electromagnetic interference performance: in line with the standards of IEC60255-22.
12. Display mode: blue screen LCD display.

Multi-power parameter measurement function (optional):
The device has the function of measuring electrical parameters, measuring three-phase current, three-phase voltage, active power, reactive power, apparent power, power factor, grid frequency, zero-sequence current, forward and reverse active energy, forward and reverse reactive energy Equivalent power parameters, measurement accuracy 0.5%, can directly replace the instrument function on the panel.
Wireless contact temperature measurement function:
This device has a temperature measurement function, the temperature sensor is a watch strap, and the standard length of the watch strap is 34 cm; according to the contact points of the watch strap, it can be divided into 3-point temperature measurement, 6-point temperature measurement, 9-point temperature measurement, and 12-point temperature measurement. temperature, each 3 straps are installed on the upper and lower contacts of the circuit breaker or the copper bars of the bus bar, and the three phases of A, B, and C are respectively yellow, green, and red straps; each strap has its fixed contacts The address corresponds to the address on the host of the device, and communicates with the host to upload the measured real-time temperature to the host of the device.
The temperature measurement range of the strap is -20°C~120°C. When the contact temperature exceeds 70°C (factory setting value), the device’s overheating alarm indicator lights up, and the overheating alarm relay contacts are closed and output.
Digital input function (optional):
The device can be equipped with switch value input function, which can reflect the switch position information, and can be transmitted by remote signal, up to 6 switch value input interfaces. The digital input interface is a passive dry contact input, and the power supply has been provided inside the device.
Communication function:
This device can be equipped with RS485 communication interface and modbus protocol, which can transmit real-time temperature and humidity values, contact temperature monitoring values, real-time power data, data switch status information, a series of parameters such as heating, disconnection, exhaust, overheating, etc.


(1)3-point temperature measurement: tie the first pair of straps (1/2/3) with the same contact numbers to the contacts on the circuit breaker, and the temperature measurement contact surface of the straps is close to the contacts;
(2)6 Point temperature measurement: tie the second pair of straps (4/5/6) with the same contact numbers to the lower contacts of the circuit breaker, and the temperature measurement contact surface of the straps is close to the contacts;
(3) 9-point temperature measurement: tie the third pair of straps (7/8/9) with the same contact number to the busbar copper connector attachment, and the strap temperature measurement contact surface is close to the copper bar;

Rear terminal description:

Wiring method

Installation size

The temperature monitoring points of high-voltage electrical equipment are all in the environment of high voltage, high current, and strong magnetic field, and even some monitoring points are still in a closed space. Due to problems such as strong electromagnetic noise, high-voltage insulation, and space limitations, the usual temperature Measurement methods cannot solve these problems and cannot be used. The wireless temperature monitoring system independently developed and designed by our company uses radio waves for signal transmission. The sensor is installed on the high-voltage equipment and has no electrical connection with the receiving equipment, so the system fundamentally solves the problem that the operating temperature of the high-voltage equipment's contact is not easy to monitor online in real time.
The wireless temperature monitoring system has extremely high reliability and safety, and can be directly installed on each high-voltage switch, busbar connector, outdoor knife switch, transformer and other electrical contacts that are prone to high temperature. The system is equipped with a standard communication interface and can be run on a network. Through the host computer software, the real-time operating temperature data of the high-voltage equipment can be recorded. It provides historical data for the maintenance of high-voltage equipment, and realizes the predictive maintenance of high-voltage equipment thermal failure.

2.1 Structure diagram of wireless temperature measurement system

2.2 Principle structure diagram of wireless temperature sensor

The wireless temperature sensor is used to measure the temperature of the surface or contact of high-voltage charged objects, such as the operating temperature of exposed contacts in high-voltage switch cabinets, busbar connections, outdoor knife switches and transformers. The wireless temperature sensor is composed of temperature sensor, signal modulation and amplification, logic control circuit, wireless modulation interface, etc. (as shown in the figure below). The sensor sends the collected temperature signal to the wireless temperature measurement host through the wireless network.


3.1 Main functions:

The main function		Features
basic Function	Receive data	Receive the temperature and sensor working voltage uploaded by the wireless temperature sensor
	Display Data	The received data is displayed in color, the display effect is more intuitive, and the backlight switch is controllable, suitable for a variety of applications
	clock display	A real-time clock is displayed and used as a time base for event recording
	parameter settings	All parameters can be set flexibly, easy to operate, and data will not be lost when power off
	Alarm Output	When an alarm event occurs, the relay dry contact signal is output and a buzzer alarm sound prompts
	Temperature alarm record	Record the temperature, start time and end time of the temperature measurement location where the alarm has occurred. Up to 200 records can be saved. When there are more than 200 records, the oldest record will be automatically overwritten
	password management	The password management method is adopted, and the password must be entered when setting parameters. The password is divided into user password and system password. Entering the system password can perform more advanced setting functions.

3.2 Technical indicators

technical parameter		Technical indicators
wireless parameter	radio frequency	433MHz
	Manage the number of receiving modules	≤3pcs
	Manage the number of wireless sensors	≤240pcs
communication parameter	Communication Interface	Method 1: RS485 communication interface, communication distance ≤1200m Method 2: Wireless digital communication, communication distance: 500~800m
	Host network number	≤128 units
	communication protocol	Modbus protocol "Wireless Temperature Measurement System Communication Protocol"
	baud rate	1200, 2400, 4800, 9600, 19200 bps optional
Alarm default parameters	Temperature alarm value	Upper limit: +90°C, lower limit: -20°C
	temperature alarm value	Upper limit: +60°C, lower limit: -10°C
	Alarm voltage value	2700mV
Relay dry contact parameters		AC220V/5A (1 set of passive normally open/normally closed contacts)
Operating Voltage		AC85～265V/DC110～370V
Machine power consumption		≤5VA
Operating temperature		-25℃~+70℃
Working humidity		≤90%RH, no condensation, no corrosion
altitude		≤2500m
Protection class		IP20
Insulation resistance		≥100MΩ (temperature is 10~30℃, relative temperature is less than 80%)
Installation method		wall mount

4.1 Display panel

illustration:

1. Power indicator light
2. Running indicator light
3. Warning light
4. Alarm indicator light
5. LCD display area
6. Button

Dimensions of the temperature measuring host (unit: mm)
Temperature measurement host installation method: wall-mounted installation
Dimensions of the wireless sensor strap (unit: mm)
Strap installation method: bundled
installation site	Removable high-voltage switchgear: busbars, static contacts, cable laps, etc.
	Fixed high-voltage switchgear: busbar, isolation switch, cable lap and other parts.
installation steps	①The cabinet should be powered off during installation; ②Attach the temperature measuring contacts of the wireless temperature sensor to the object to be measured; ③Pull one end of the wireless temperature sensor strap through the other end and slowly tighten it; ④Until the strap is tightly tied to the object to be measured, be careful not to pull too much, it is better to just tighten it; ⑤After the strap is fixed, you can tie up or cut off the excess extended part of the strap.
Precautions	①Before installation, turn on the switch of the wireless temperature sensor. ②The temperature measuring contacts of the wireless temperature sensor should directly contact the surface of the part to be measured, and cannot be installed through a heat shrinkable sleeve, otherwise the measurement will be inaccurate.

product name	product model	basic function		remarks
Wireless point temperature device	CHTK-WX-6		1-12 Road wireless temperature measurement, battery power supply type, If you need to increase more power measurement, you need to add another 200 yuan. Note: According to 6 points of quotation, each additional point plus + 100 yuan.	Open hole is 91mm * 91mm
Wireless point temperature device (Self-collected power)	CHTK-WX-ZQD-6		1-12 wireless temperature measurement, self-electric type, If you need to increase more power measurement, you need to add another 200 yuan. Note: According to 6 points of quotation, each additional point plus + 100 yuan.	Open hole is 91mm * 91mm
Wireless temperature measurement and centralized monitoring system	CHTK-9000D		Host wireless temperature measurement centralized monitoring system, the most self-generated power of 180 yuan