Long term online monitoring of SF6 gas density, micro water, temperature, and their changing trends in circuit breakers. Its function is to provide a change curve when SF6 gas related indicators change; When the relevant indicators reach the alarm state, the alarm or automatic alarm device will be activated; When the relevant indicators exceed the standard and reach a dangerous situation, an alarm or automatic locking device is activated to prohibit the operation of the circuit breaker, in order to ensure the safety of the equipment and the entire substation system. The above monitoring equipment is equipped with RS-485/CAN communication interface, which can upload monitoring data in real time to substations, city centers, and even higher-level monitoring centers, truly realizing online monitoring of equipment in substations, especially unmanned stations.

The KDWS-ZX SF6 Micro Water Density Online Monitoring System integrates the latest telemetry and remote sensing technology with backend computer technology. It has a compact appearance and can achieve high-precision measurement, computer backend processing, massive historical data storage and other functions. It is suitable for online measurement of micro water, density and temperature of SF6 gas in SF6 circuit breakers, GIS, AIS and other equipment of various voltage levels, achieving new dynamic monitoring such as no emissions, environmental protection, safety, real-time, remote, etc., to meet the needs of power distribution automation and equipment status maintenance, and reserve interfaces for the intelligent construction of the power grid

(1) High precision and high reliability
The transmitter adopts imported high stability sensors, which have been corrected and compensated by the internal circuit of the transmitter, resulting in good output linearity and high accuracy; The external structure of the transmitter is also more suitable for measurement in high-frequency electric field environments. It is integrated with the circuit processing part to reduce interference coupling and improve the stability and reliability of the circuit's long-term operation.

(2) Realize online monitoring and status maintenance
This monitor can operate for a long time with a hanging line. Its equipped RS-485/CAN communication interface can upload monitoring data in real time to the monitoring center. When the measured gas index exceeds the standard, the monitor will automatically upload an alarm or lockout signal to the remote monitoring center according to the pre-set threshold, or directly activate the alarm or lockout device. The upper computer software can sample and store monitoring data according to the set time and frequency, and automatically plot the above data into a trend chart as needed for observation and analysis.
The application of SF6 gas comprehensive online monitoring technology can realize the status monitoring of circuit breakers, which is conducive to timely grasping the operating status of equipment, ensuring the safe and stable operation of the power system, enabling status maintenance, reducing maintenance costs and power outage time, and thus improving management level.

(3) Simple structure, easy to install and use
The monitor adopts a closed design with a beautiful appearance. The sensor, power supply, and data output circuit are installed in the same casing. It is waterproof, dustproof, explosion-proof, resistant to strong electromagnetic interference, easy to install and use, and can be used in high-frequency electric field environments and outdoor environments.
(1) Online monitoring of SF6 gas humidity, density, and temperature;
(2) Online monitoring of gas leaks and leak alarms;
(3) Low voltage alarm and locking device can be automatically activated according to preset or user specified values
(4) Reserve RS-485/CAN bus communication interface;
(5) Automatically draw trend charts of state changes through backend software;
(6) Large screen LCD displays real-time data on-site and has screen protection function;
(7) Alarm and lockout threshold values and display modes;
(8) Sealed, anti-interference, suitable for outdoor and low-temperature environments;
(9) No emissions, environmental protection, economy, safety, and reliability;
(10) Online monitoring of micro water, density, temperature and other parameters in SF6 circuit breakers or composite electrical appliances;
(11) Realize pressure and temperature compensation for micro water, as well as temperature compensation for density, to ensure the authenticity and reliability of micro water and density data;
(12) Adopting sensors with multiple technologies and self calibration functions;
(13) The collection unit can be put into operation and exited without affecting the status of the main equipment, and without affecting the normal operation of the main equipment;
(14) The use of internal loop technology within the collection unit significantly improves sampling accuracy;
(15) On site large screen LCD display, draw trend charts, and upload them in real-time;
(16) Built in density relay with passive output, capable of setting locking/alarm/overpressure point values;
(17) Closed design, waterproof and dustproof, resistant to high-frequency interference, suitable for indoor and outdoor use;
(18) Multiple valve joints, easy to install and disassemble, saving maintenance costs.

Main technical indicators:
Color LCD displays real-time various parameter values, and function settings are displayed
Working temperature range: 0 ℃~55 ℃
Storage temperature range: -20 ℃ to 60 ℃
Relative humidity: 5% to 95% (no condensation)
Mean time between failures: 50000 hours
Automatic screensaver function, wall mounted installation
Reserve multiple input/output interfaces: RS232 or RS485 or TCP/IP or CAN
Communication interface: Isolated RS-485/CAN