Measurement Functions - ABB SPAC 536 C User Manual

Interlocking
Direct output control
Measurement
functions
The control module includes a feeder oriented
interlocking logic which can be freely pro-
grammed by the user. When writing an inter-
locking program the user defines when it is
allowed to give an open or close signal to a
specific object. When an open or close com-
mand is given, the interlocking system checks
whether the operation is permitted or not.
Normally the outputs OPEN1...6 and CLOSE
1...6 are controlled by open or close com-
mands, either given locally with push-buttons
or over the serial bus. When Direct Output
Control has been selected all outputs, i.e.
The control module SPTO 6D3, the combined
overcurrent and earth-fault relay module SPCJ
4D24 and the earth-fault relay module SPCS
3C4 measure analog signals.
The combined overcurrent and earth-fault relay
module SPCJ 4D24 measures the three phase
currents and the neutral current. The measured
currents are shown locally on the display of the
relay module and, on request, transmitted to
higher-level systems over the SPA bus.
The directional earth-fault relay module SPCS
3C4 measures three analog signals: the neutral
current I , residual voltage U
0
the resistive or capacitive component of the
neutral current. The three analog signals are
presented locally on the display of the module
and, if necessary, transmitted to higher-level
systems over the SPA bus.
The relay modules also record the analog signals
in a fault situation. The relay modules always
indicate the measured values as multiples of the
rated current and rated voltage of the feeder
terminal.
The standard control module is provided with a
pulse counter input for the counting of the
energy pulses. To be able to measure analog
signals the control module SPTO 6D3 requires
an optional measuring module: type SPTM
8A1, SPTM 6A2 or SPTM 6A3. When using
the measuring module SPTM 8A1 the control
module is able to measure three phase currents
and three phase-to-phase voltages. Active and
reactive power are measured via the mA inputs
and external measuring transducers.
Thereafter the command is executed or can-
celled.
The interlocking can be selected to be depend-
ing on the status of the four-pole input channels
1...7 or the input channels 8...17. The tripping
signals of the relay modules are not affected by
the interlocking system.
OPEN1...6, CLOSE1...6 and SIGNAL5 or 6,
can be controlled without an open or close
command. The outputs are controlled by a
programmed logic and the status of input chan-
nels 1...7 and 8...17.
When using the measuring module SPTM 6A2
the control module can measure three phase
currents and three phase-to-phase voltages. Ac-
tive and reactive power are measured using an
Aron connection and the internal current and
voltage signals of the module.
When using the measuring module SPTM 6A3
the control module can measure three phase
currents and three phase-to-phase voltages. Ac-
tive and reactive power are measured on the
basis of the internal voltage of the module and
two current signals. The voltage to be used and
the corresponding currents are selected with
and Iϕ, which is switches.
0,
The ratio of the primary current and voltage
transformers can be selected with the control
module. Based on these values the control mod-
ule is able to indicate the currents, voltages and
power as primary values. If the mA inputs are
used for power measurement, the mA signals
can be scaled as actual MW and Mvar values.
These primary values can be indicated locally
and, when needed, be transmitted to the higher-
level system over the SPA bus.
Active energy can be measured in two ways; by
calculating the value on the basis of the power
measured via one of the optional measuring
modules, SPTM 8A1, SPTM 6A2 or SPTM
6A3, or by employing input channel 11 as a
pulse counter input. In the latter case an external
energy meter with pulse output is needed. In
both cases the amount of measured energy can
be displayed locally and transmitted to the re-
mote control system over the SPA bus.
11