Switching

l Monitors current during breaking.

l Est imates primary contact wear( åò i²dt)

l Monitors arc duration.

Auxiliary and control circuits

l Monitors operating coil continuity.

l Monitors auxiliary supply

voltage.l Monitors heater integrity.

CBWatch-2 continuously monitors circuit breaker condition. It signals in real time any malfunction to maintenance services. Therefore, CBWatch-2 facilitates reduced maintenance cost and failure risk.

CBWatch-2Modular circuit breaker monitoring system

Optional functions

SF l Monitors gas pressure and

temperature and calculates the SF or gas mixture density using the Beattie-Bridgeman algorithm.

l Detects liquefaction and inhibits false alarms in the event of liquefaction.

l Calculates SF leakage rates in order to give advance warning of alarm and lockout threshold levels.

Mechanical operation

l Monitors close and open operating times.

l Allows the use of conventional auxiliary switches, static auxiliary switches or primary contact travel sensors.

l Monitors primary contacts separation speed, buffering and over travel.

l Detects deterioration in mechanical performance (friction, corrosion, breakage, spring fatigue and buffer defects).

l Monitors auxiliary switch timing.

Spring operating mechanism

l Monitors recharging motor operating time.

l Detects motor or motor limit switch defects.

Hydraulic operating mechanism

l Monitors pump motor operating time.

l Detects internal and external leackage.

l Detects nitrogen loss from accumulator.

l Detects threshold pressure on hydraulic system.

6

6

6

Spring mechanism :l Spring motor limit switch

contacts.

Hydraulic mechanism : l Pump start contacts.l Hydraulic pressure sensor.

Auxiliary and control circuits :l Temperature sensors. l Coil supervision relays.

Installation

l Dimensions 310mm x 280mm x 95mm12 x 11” x 3

l Installation in operating mechanism, local control cubicle or separate enclosure.

Available versions

l Version for circuit breakers with one operating mechanism for all three poles.

l Version for circuit breakers with one operating mechanism for each of the three poles.

Environment

l Ambiant temperature -40°C to +55°C(Option : -50°C with heater)

l Electromagnetic compatibility according to standards :

- IEC 255-5- IEC 1000-4-4- ANSI C37-90-1- IEC 1000-4-12- IEC 255-22-3

Power supply

l 48 - 125V DC ; 48 - 120V ACl 150 - 250V DC ; 150 - 240V ACl Tolerance : -30% to +15%l Power consumption : 30 VA

maximum.

Dependability

l High reliability and high availability due to continuous self monitoring of electronic module and sensors.

Local interface

l LCD display and keypad (option) l 1 self monitoring status relay. l 4 configurable output relays.l 1 self monitoring status LED.l 4 local indication LEDs.l RS232 local communication port.

Network interface

l Isolated RS485 communication port with MODBUS protocol.

SF :l Pressure and temperature

sensors.

Operations :l Coil signal sensors. l Auxiliary contacts.l Primary contact travel sensors.

Primary current : l Auxiliary current transformers.

Example installationCircuit breaker with one operating mechanism per pole

Sensors required for different options

¼‘’ ¾’’

Pole A sensorsPole B sensors

Pole C sensors

INTERFACE :Local RS232 port

RS485 MODBUS portOutput relay contacts

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TRANSMISSION & DISTRIBUTION - Appareillage haute tension - 130, Rue Léon Blum - BP 1321 - 69611 Villeurbanne (FRANCE)

Tél. 33 (0) 4 72 68 34 34 - Fax 33 (0) 4 72 68 34 96