Measurement - ABB RET615 Product Manual

Transformer Protection and Control
RET615
Product version: 4.0
Further, the IED offers one control block which is
intended for motor-operated control of one
earthing switch control and its position indication.
Two physical binary inputs and two physical
binary outputs are needed in the IED for each
controllable primary device taken into use.
Depending on the chosen standard configuration
of the IED the number of unused binary inputs
and binary outputs varies. Further, some standard
configurations also offer optional hardware
modules that increase the number of available
binary inputs and outputs.
In case the amount of available binary inputs and/
or outputs of the chosen standard configuration is
not sufficient, the following alternatives are
recommended:
• To modify the chosen standard configuration of
the IED in order to release some binary inputs
or binary outputs which have originally been
configured for other purposes, when applicable.
• To integrate an external input or output module
for example, RIO600 to the IED. The binary
inputs and outputs of the external I/O module
can be used for the less time critical binary
signals of the application. The integration
enables releasing of some initially reserved
binary inputs and outputs of the IED in the
standard configuration.
The suitability of the binary outputs of the IED
which have been selected for controlling of
primary devices should be carefully verified, for
example the make and carry as well as the
breaking capacity. In case the requirements for
the control-circuit of the primary device are not
met, the use of external auxiliary relays should to
be considered.
The optional large graphical LCD of the IED's HMI
includes a single-line diagram (SLD) with position
indication for the relevant primary devices.
Interlocking schemes required by the application
are configured using the signal matrix or the
application configuration functionality of PCM600.

7. Measurement

The IED continuously measures the high voltage
(HV) side and the low-voltage (LV) side phase
currents and the neutral current of the protected
transformer. In addition, the IED calculates the
20
symmetrical components of the currents and
voltages, maximum current demand value over a
user-selectable pre-set time frame, the active and
reactive power, the power factor, and the active
and reactive energy values. Calculated values are
also obtained from the protection and condition
monitoring functions of the IED. Depending on the
standard configuration, the IED also measures the
phase voltages, the residual voltage and the
voltage sequence components.
For standard configuration A, B, C and D RTD/mA
inputs are offered as an option. By means of the
optional RTD/mA module the IED can measure up
to eight analog signals such as temperature,
pressure and tap changer position values via the
six RTD inputs or the two mA inputs using
transducers.
The values measured can be accessed locally via
the user interface on the IED front panel or
remotely via the communication interface of the
IED. The values can also be accessed locally or
remotely using the web-browser based user
interface.
8. Disturbance recorder
The IED is provided with a disturbance recorder
featuring up to 12 analog and 64 binary signal
channels. The analog channels can be set to
record either the waveform or the trend of the
currents and voltage measured.
The analog channels can be set to trigger the
recording function when the measured value falls
below or exceeds the set values. The binary
signal channels can be set to start a recording on
the rising or the falling edge of the binary signal or
both.
By default, the binary channels are set to record
external or internal IED signals, for example the
start or trip signals of the IED stages, or external
blocking or control signals. Binary IED signals
such as a protection start or trip signal, or an
external IED control signal over a binary input can
be set to trigger the recording. The recorded
information is stored in a non-volatile memory and
can be uploaded for subsequent fault analysis.
1MRS756891 F
ABB