T&D World Magazine
System Monitors MV and HV Circuit Breakers

System Monitors MV and HV Circuit Breakers

CB MONITOR from ISA is a cost-effective on line diagnostic system used to monitor MV and HV circuit breakers. CB MONITOR system can monitor up to 10 circuit breakers at the same time. The purpose of the Circuit Breaker Monitoring System is to highlight issues before these can cause an inefficiency in the system, thus allowing a far better management of condition based maintenace.

This system is designed not to be invasive and does not affect the substation reliability. All the measurements performed by the monitoring devices are delivered to the system using the IEC standard 60870-5-104 (IEC standard 60870-5-101 optional) and DNP3 communication protocol. The analysis of the signals and the causes, that raised alarms, are performed by dedicated units, by reading data from the monitoring and telecontrol system. By means of a dedicated line, separate from the monitoring system, it is also possible to modify parameters of the monitoring devices, and to upgrade their firmware by remote control.

The CB MONITOR System is easy to install and, once configured, operates continuously.

The CB MONITOR system can perform on line diagnostics on up to 10 circuit breakers simultaneously. CB MONITOR verifies continuously the following parameters:

  • Auxiliary contacts opening and closing time;
  • Auxiliary contacts bouncing times;
  • SF6 Density trend (optional);
  • Temperature (optional);
  • Accumulated fault current during arcing time (I2t);
  • Open and close current profiles;
  • Mechanism operating time (optional);
  • Battery voltage.
Then, the monitoring system through its software processes and manages the acquired data and automatically sends alarm messages to the central SCADA if thresholds are exceeded. The software can process and analize the data and automatically can detect and report in details the origin of the problem (electrical, mechanical, aging or due to gas leakage), without the need of the operator’s analysis.

Each CB MONITOR unit can monitor several circuit breakers (up to 10) at the same time. Auxiliary contacts and command coil currents are the parameters analyzed in every circuit breaker. The results are compared with the correspondent alarm threshold. Each CB MONITOR unit is connected to monitoring and telecontrol system, via standard IEC 60870- 5-104 and 101-DNP 3 (optional) communication protocol. CB MONITOR units are mounted near to protection relays.

CB MONITOR units are designed to operate reliably under extreme weather conditions and electrical interference found in normal substation operations. In particular:

  • Modules mounted outdoors are IP 65 and designed to work over an extended temperature range (from - 40°C to + 85°C).
  • Self-diagnostics continuously tracks the condition of the CB MONITOR and issues alerts if an abnormality is detected in the system.
  • By the continuous monitoring of the key parameters, CB MONITOR detects malfunctions in early stage and issues prioritized alarms communicating abnormal conditions and guiding maintenance decisions.
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