Switchgear Circuit Breaker Vacuum Degree Online Monitoring Device
IN-301 Online Monitoring Device for Vacuum Degree of CB

Switchgear Circuit Breaker Vacuum Degree Online Monitoring Device

Device Introduction

IN-301 Circuit Breaker Vacuum Level Online Monitoring Device is mainly used to monitor the internal vacuum environment of vacuum circuit breakers in real time to ensure that it is maintained within safe and effective operation range. The device consists of high-performance sensors, data acquisition unit, signal processing circuit, CPU logic control module and power management unit, etc. By means of high-precision sensors and advanced data processing technology, it is able to continuously detect the vacuum level inside the circuit breaker interrupter room.

Monitoring Principles

Switchgear Circuit Breaker Vacuum Degree Online Monitoring Device

A schematic diagram of the vacuum-related characteristics of a switchgear circuit breaker, mainly showing the relationship between discharge voltage and pressure * gap distance , is analyzed as follows:

Meaning of horizontal and vertical axes

  • horizontal axis: Represents pressure * clearance distance, reflecting the combined parameter of pressure and clearance distance inside the circuit breaker.
  • vertical axis: Represents the discharge voltage, i.e. the value of the voltage required for the discharge phenomenon to occur.

Meaning of different curves

  • black curve: indicates that the operating voltage isIn the case, the discharge voltage increases with the pressureTrends in the variation of the gap distance. It can be seen that at a certain pressureThe discharge voltage starts to decrease after the gap distance point (approx. 1Pa position).
  • gray curve: indicates that the operating voltage is In the case, the discharge voltage increases with the pressureTrends in gap distance variation. In the pressureThe gap distance is around 5 - 10 Pa, and there is a more significant change in the discharge voltage.

Applicable voltage marking

The diagram is also labeled with two inclined straight lines representing "Applicable Voltage: High" and "Applicable Voltage: Low". This indicates that at different pressuresGap distances range, circuit breakers are suitable for different voltage levels. With the pressureThe applicable voltage level gradually increases with increasing gap distance and vice versa for lower voltage levels.

The significance of on-line monitoring of vacuum level of switchgear circuit breakers

With this graph, the O&M staff can visualize that at different operating voltages, the vacuum level (through pressuregap distance reflects) on the discharge voltage. In practical monitoring, this can be based on the operating voltage of the circuit breaker, combined with the pressureThe relationship between the gap distance and the discharge voltage determines whether the vacuum degree of the circuit breaker is normal. If the actual discharge voltage deviates from the value corresponding to the theoretical curve, it may mean that the vacuum degree of the circuit breaker is in trouble, and it needs to be overhauled and maintained in time to guarantee the safe and stable operation of the switchgear.

Equipment parameters

Installation Main unit: wall-mounted; embedded; rail (LCD model);
Sensors: magnetic; adhesive backed; screw fastened;
signal output RS-485, Modbus-RTU; passive trunk node;
environmental adaptation Ambient temperature: -40℃～+70℃; Ambient humidity: 0～95% (no condensation)
Operating power AC/DC220V, ±10%
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