- Phase Failure Relays
- Monitoring Relays
- Motor / Pump Protection Relays
- Electronics Timers
- Liquid Level Controllers
- Power Line Transducers And MFM
- Automation Products
- Alarm Annunciators
- Products For Agri Sector
Monitoring Relays
TAPE INSULATED RING TYPE CBCT
Introduction & Application
CORE BALANCE CURRENT TRANSFORMERS (CBCT) is a sensor to sense earth fault current in conjunction with an EARTH FAULT RELAY to protect the system when an EARTH FAULT occurs on one or more phases. The CBCT is mounted externally & load carrying conductors are passed through CBCT. The CBCT inner diameter is large enough to pass all the three bus-bars or the three phase cables, unlike a metering CT where only one bus- bar or cable passes through the CT. As the VECTOR SUM of the three currents at any given time is ZERO, the resultant magnetic field through the core of the CT is zero. This is the healthy situation of the system. If required Neutral also can be passed through CBCT in case of 3 phases, 4 wire system. Ideally Vector Sum will remain zero in case of fault free systems.
In the event of an Earth Fault occurring in any of the phases, the current in that phase rises, inducing a resultant magnetic flux in the CT secondary, energizing the relay & tripping the system.
The current at CBCT secondary will depend on the actual earth fault current level & hence unbalanced loading does not affect the functioning of Earth fault relay.
Salient Features
• All current ratio’s are available to match Minilec EFR/ELR.
• Light Weight.
• Compact in size.
• Cost Effective.
Technical Data
- System 100-120 / 220-240 / 380-440 V AC ± 20%
- Auxillary In Built
Supply Voltage
- Ext. Input 5A, CT Secondary & R,Y, B
Ext. Input
- Output Contact 2 CO
Output Contact
- Under Frequency -
- Over Frequency-
- Reverse Power2% - 20% (adjustable)
Trip Setting
- Power On Delay1 - 10 secs. (adjustable)
Power On Delay
- Trip Time Delay1 - 10 secs. (adjustable.)
Trip Time Delay
- ResettingAuto / Manual
Resetting
- Weight460 gms.
Weight
- Overall (L x W x D) 76 x 56.5 x 117.5
- Mounting (L x W)67 x 46 / 35 mm rail Mounting
Dimensions (mm)
- Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)