MODBUS RTU Protocol

MODBUS RTU protocol along with DNP 3.0 communications is now available as an option. Communications can be either a half-duplex RS-485 electrical interface or through ST terminated 850 nm 50 or 62.5 micron multi-mode fiber. All fiber interfaces have the unique capability of passing the optical signal through to another DNP or MODBUS slave port for the purpose of daisy-chaining multiple devices over a single pair of fiber optic cable.

More Digital Inputs

We have expanded the number of digital inputs from two to 14 thus giving the TTC-1000 the ability to serve as your RTU on your power transformer. In addition, all digital inputs can handle AC input wetting voltages from 24 VAC to 240 VAC or DC wetting voltages from 36 to 340 VDC, making the inputs suitable for monitoring any contact closure on your power transformer. When equipped with MODBUS RTU or DNP 3.0 protocol these signals are sent directly to EMS. In addition, all of the digital inputs can be mapped into the programmable logic. Some typical applications include the ability to activate cooling from potential devices or to block cooling fans for fire suppression.

More CT and Analog Inputs

The TTC-1000 now has up to eight CT inputs or analog inputs. CT inputs are used to calculate up to three winding temperatures and for monitoring load current of fan, pump or LTC motors. Units can be purchased with a combination of CT and analog inputs. Analog inputs are used to provide an interface to collect analog quantities at the transformer for communications back to EMS over either DNP 3.0 or MODBUS RTU communications.

Tap Position Monitoring

The TTC-1000 has just incorporated the ability to monitor tap position using the existing electrical connections on you tap changer mechanism, avoiding the messy mechanical interfacing to resistor bridges, shaft encoders, or Selsyn motors. Some of the important capabilities that our new feature gives is the ability to monitor LTC differential temperature by position to let you know in what range the tap changer may have a heating problem. Our tap position monitoring also maintains the maximum tap changer operate time and can alarm to alert of impending problems. Counters are maintained for each position as well. Patents pending.

LTC Rate of Rise Detection

The TTC-1000 now has the capability to detect both slowly and quickly evolving LTC heating problems. The TTC-1000 now implements two algorithms that permit correct detection of slowly evolving heating problems usually due to contact coking, and quickly evolving problems associated with rapid heating in the LTC tank. Patents pending.

__________________________________________________