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Wireless door magnetic sensor (wireless door switch sensor), installed on cabinet doors/gates, is used in conjunction with devices such as permanent magnets or electromagnetic coils that can form a magnetic field. It can monitor the opening and closing status of cabinet doors and the number of times they are opened and closed in real time online. It has the characteristics of small size and easy installation, and will not affect the normal use of the cabinet door. 

The expansion joint of the busbar tube is mainly used to absorb the thermal expansion and contraction of equipment, the displacement of the foundation expansion joint, the installation adjustment between equipment, and various stresses caused by earthquakes and operations, ensuring the integrity of the busbar tube and other parts. At present, the displacement monitoring of the busbar tube expansion joint is achieved by setting mechanical scales and scale indicator boards on both sides of the expansion joint, and using manual observation. This method has problems such as large manual workload, high labor cost, and poor real-time performance. By using expansion joint deformation sensors, the shortcomings of existing monitoring methods that require manual observation have been solved, and automatic monitoring, recording, and remote transmission of parameters such as displacement and environmental temperature of the busbar tube expansion joint have been achieved. 

Wireless temperature sensor, based on the fusion of 2.4GHz digital wireless technology, intelligent frequency modulation technology, and ultra-low power consumption technology, with integrated and miniaturized design and IP67 structure packaging, can be installed at the temperature measurement points of all equipment joints in power transmission, transformation, and distribution. Installing it at joints, switch contacts, line conductors, etc. can achieve high reliability real-time online monitoring of temperature, temperature rise, and phase to phase temperature difference, thereby realizing intelligent management of operating temperature of power equipment. Built in SM1/SM7 chips for identity verification and data encryption, ensuring secure and reliable communication data transmission. 

Wireless electromagnetic counter, used to replace the analog signal action counter of circuit breakers, can record the number of switch actions in real time and count the pressure test actions. It consists of control circuit, attenuation circuit, optoelectronic isolation circuit, signal conditioning circuit, power circuit, wireless module indicator light, buttons, antenna, etc. When the switch is activated, the control circuit counts the number of digital signals, and the action count value is saved to the memory and displayed in real-time on the digital display. Wireless counters can achieve wireless communication with mobile terminals (smartphones, tablets, etc.) through wireless modules. 

Wireless insulator leakage current sensor, using direct measurement method to measure current signal, real-time monitoring of high-voltage insulator to ground leakage current. Integrated high-performance wireless SoC, high-precision current measurement circuit, flashover protection circuit, power supply and energy storage circuit, with a wide dynamic measurement range and good measurement accuracy, easy to install and use, and can operate for a long time without maintenance. 

Cable data collector, designed for monitoring cable joint temperature and cable shielding layer circulation, integrates one temperature sensor and two current sensors to monitor cable joint temperature and cable shielding layer circulation in real-time online. The data collector has reserved 2.4GHz wireless transmission and reception function, which can be used to access various sensor node data of the wireless sensor platform. 

The wireless cable shielding layer leakage current sensor monitors the weak current leaked from the cable skin online, and transmits the collected current data to the base station (center) platform through wireless sensor network (WSN) technology, which can prevent leakage accidents caused by leakage. The wireless cable skin shielding layer leakage current sensor samples and measures the power frequency AC signal through the electromagnetic induction principle of the current transformer. It samples real-time current values from several points (enough) within one AC signal cycle, calculates the true effective value through an innovative Δ ∑ calculation method, and sends the measured current and voltage values to nearby base stations or central platforms through wireless signals, achieving real-time online monitoring. 

The wireless cable shielding layer ring current sensor monitors real-time current on the cable online and transmits the collected current data to the base station (center) platform through wireless sensor network (WSN) technology, which can prevent leakage accidents caused by leakage. The wireless cable shielding layer ring current sensor samples and measures the power frequency AC signal through the electromagnetic induction principle of the current transformer. It samples real-time current values from several points (enough) within one AC signal cycle, calculates the true effective value through an innovative Δ ∑ calculation method, and sends the measured current and voltage values to nearby base stations or central platforms through wireless signals to achieve real-time online monitoring. 

Cable comprehensive monitoring sensors, including current and temperature monitoring, as well as monitoring the grounding circulation of the shielding layer and armor layer. The safe and stable operation of the terminal cable of the tower on the road is related to the safety of the contact network power supply. Real time monitoring of the cable working current, terminal joint temperature, and terminal shielding layer and armor grounding current ensures the safe operation of the cable system. 

Non contact wireless current sensor, using TMR magnetic field intensity induction method, with small size and no need to form a loop for installation, collects and measures the current and power frequency on the 400V wires of the distribution network. TMR components have the characteristics of good temperature stability, high sensitivity, low power consumption, good linearity, and no need for additional magnetic ring structures. The sampling frequency is up to 10KHz, and waveform analysis is carried out to monitor and locate the abnormal changes in current or power frequency, and to determine fault current or short-circuit current. Sensors send data to data transmission base stations through wireless networking communication.

Wireless current sensors are mainly used to monitor cable current information, fundamental current, etc. Adopting a through core design for easy installation. Send data to the data transmission base station through wireless networking communication, and provide feedback on the leakage situation of the equipment in a timely manner to avoid accidents and ensure safe use and production operations. It can be widely used for real-time monitoring of the insulation status of busbars and various branches in DC and AC power supply systems. 

Wireless lightning arrester leakage current sensor is mainly used to monitor the leakage current information, fundamental current, environmental humidity, temperature, etc. of zinc oxide lightning arrester. Adopting a through core design for easy installation. The sensor is installed at the grounding terminal of the lightning arrester to monitor the operating status parameters of the lightning arrester online, and sends the data to the data transmission base station through wireless network communication. It can timely detect abnormal situations caused by internal moisture and mechanical defects during the operation of lightning arresters, prevent accidents, and improve the reliability of power system operation.