On line, permanently installed, real time monitoring system for continuous monitoring of critical performance parameters of CB under live switchyard environment – first of its kind in country.

Depending on individually operated / gang operated mechanism of CB either 1 or 3 RTmon units will be mounted in cubical of CB poles. It will be recording transient performance characteristics critical for satisfactory operation of CB, whenever CB operates. Will store the results in local built-in non-volatile memory and further download it to central computer in control room, over non-contact type RF communication port.

The central computer will have “CIRmon” monitor software managing the system of multiple RTmons mounted on various CBs in a substation & will facilitating the following:

Viewing, analysis and comparison of test data with previous signatures or pre-set limits.

Dynamic calculations on graphical information with cursor movement facilitating easy on-screen analysis

Each time the new data is received the software compares critical values with pre-set limits and emits alarms, if limits are exceeded.

Comparative signature analysis forms an extremely powerful tool for on-line condition monitoring that can enable preventive maintenance that can be carried out on CBs.

Indication of any abnormality in real time helps planning of just in time diagnostic testing.

In a substation where many RTmons are installed, the CIRmon stores the signature data in a structured database to relate data to each CB / pole monitored.

It stores data with signature identity including operation type and date/time stamp

Option to export the signature database to corporate server

Coil Current – One analog channel is provided to read close / trip coil current. Healthiness of close / trip coils monitored

Line / Fault Current – Three analog channels are provided for three phases. Out put of clamp-on CTs, which are mounted on secondary of protection core of main CTs is connected to these analog channels. This signal is sampled during breaker operation. From this, RTmon calculates line and fault current.

Auxiliary Contact Timings – Two auxiliary contact sensing channels are provided, one each for close & trip. Time between start of coil current and change over of auxiliary contact is measured. These are field configurable as wet or dry. Healthiness of Auxiliary contacts monitored.

Main Contact Timings – Projected main contact timings are calculated with reference to Auxiliary contact timings

Arcing Time – Using main contact timing and line / fault current signal the arcing time is calculated

Clearing Time – Time to actually clear the line / fault current is calculated

Cumulative Fault Current – I2*t with duration is calculated and stored (Z|2*t)

Once installed, the results are continuously available – No further set-ups, no manpower involvement

Even when a series of re-closing operations are performed, the monitor transmits the operation signature faithfully

The kit is compatible for safe and reliable usage under EMI environment found in Live Switchyards.

Supplied with necessary accessories like clamp-on CTs, cables, mounting arrangements etc.