Optional Features; Additional Apparatus Control; Additional Interlocking; Measurements - ABB REC 561 User Manual

1MRK 580 146-XEN
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4 Optional features

4.1 Additional apparatus
control

4.2 Additional interlocking

4.3 Measurements

Introduction - REC 561
Additional apparatus control functions are available as options. They are
applicable for several bays, that is, up to 12 bays and 24 high-voltage
apparatuses in total.
Additional interlocking modules for more bays are available as options. In
total three single-breaker bays or two double-breaker bays or two 1½-
breaker diameters.
A total of 10 analogue input quantities can be connected to the trans-
former module consisting of five voltage transformers and five current
transformers. These direct inputs are normally used for measuring func-
tions according to the following, when the control terminal is designed
only for one bay:
• Three-phase currents
• Residual current of the protected line
• One-phase current, used for disturbance recorder
• Three-phase voltages
• One-phase voltage for reference voltage from busbar 1
• One-phase voltage for reference voltage from busbar 2
At three-phase measurement, the values of active power (W), reactive
power (var), frequency (Hz), and the mean value for voltage (U) and cur-
rent (I) can be calculated.
To reach a high accuracy in the measurements (≤ 0.25% of full scale for U
and I), a factory calibration can be made. Here, full scale is 1.3 x U
2.0 x I .
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When the control terminal is designed for several bays, the voltage and
current inputs can be galvanically separated and used for single-phase
measuring.
Besides the mentioned inputs above, analogue inputs for mA signals are
also available.
For both categories of inputs (direct via transformer and mA), the values
can be updated cyclically and be presented both on the local MMI and
remotely.
In the application software, alarm limits to be used as conditions in the
configuration logic can be specified. Dead-band handling is used for
transfer over the LON bus.
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