560CVT10  RTU560 CT/VT Interface 560CVT10

The Current/Voltage Transducer Interface (CT/VT interface) is used for measuring analog AC input signals from three independent
phases with 3 or 4 wire connections. For each phase voltage, current and power are
measured directly, and a number of other parameters derived from these in software. The results are transmitted to the RTU560.
There are several versions available:
Auxiliary Voltage (LO):
ƒ 3 current-, 3 voltage inputs (In 1A)
ƒ 3 current-, 3 voltage inputs (In 5A)
ƒ 4 current-, 4 voltage inputs (In 1A)
ƒ 4 current-, 4 voltage inputs (In 5A)
Auxiliary Voltage (HI):
ƒ 4 current-, 4 voltage inputs (In 1A)
ƒ 4 current-, 4 voltage inputs (In 5A)

The CT/VT interface is a microprocessorbased Intelligent Electronic Device (IED) intended for current, voltage, power and energy measurement.
Distorted input waveforms with harmonics to the 15th are therefore detected accurately.
Additional functionality to provide functions as fault current detection, minimum and
maximum logging and analog high and low limit supervision is available.

560CVT10

The fault current is measured up to 20 times nominal current. Therefore the current inputs
withstand 50 times nominal current for 1 s.
The CT/VT interface is equipped with one binary output which can be used to indicate e.g. alarm
for over current.
All CT/VT interfaces are mounted in the RTU cabinet. Current and voltage inputs are connected via transformer only (see Figure 1).
The CT/VT interfaces are designed for mounting on DIN rails 35 mm.
Meter Operation
The following metered parameters are available:
Instantaneous Meter Values
Measured by true RMS conversion and transmission to the RTU560 of following values:
x Phase – Neutral Voltage 1N, 2N, 3N, Average
x Phase -Phase Voltage 1-2, 2-3, 3-1, Average
x Current Phase 1, 2, 3
x Fault Current Phase 1, 2, 3, N
x Active Power, Phase 1, 2, 3, Total
x Reactive Power, Phase 1, 2, 3, Total
x Apparent Power, Phase 1, 2, 3, Total
x Power Factor, Phase 1, 2, 3, Average
x Frequency,
x Phase Rotation
x Voltage / Current Harmonic Distortion (THD, current and voltage phase 1,2 and 3)