Operations Manual Thyro Power Manager
Functional Description
Version 2007-12-05
Page 37 of 52
7.3.2
Monitoring of Network Peak-Load
For the monitoring of network peak-load, the connecting process of the electrical current
converters is performed in the same manner as with the ZME function (see above). For this,
the three current converters should be located within the supply facility of the monitoring unit.
The under-stepping of the set electrical current limiting value is the focus of monitoring and
subsequent reporting.
Without deployment of a PC mode, the limiting value is equal for all three measurement
values, and can be set via the Poti R310 (standard setting = 200%). With deployment of a
PC mode, a different limiting value can be set for each of the three measurement values via
the help of a PC program or of a bus system.
If the limiting value is over-stepped, a message occurs at the alarm output (standard setting),
as well as via PC program and via bus system. The message remains as long as the limiting
value is over-stepped, if the value again falls below the limiting value, the message is also
automatically reset.
If the measurement integration time is set to T
0
(standard setting for T
0
= 1s), the
measurement process is terminated for each T
0
, and a comparison is then performed. Thus
within the standard setting, the shortest time for a message = 1s, and the shortest time for a
message duration is 1s. Instead of T
0
, also 1 network period can be set via a PC program or
bus system. This would possibly result in fuzzy displays, yet a message could then be
performed already after 20 ms (at 50Hz).
7.3.3
Voltage Measurement
If voltage converters are deployed instead of electrical current converters, also voltages can
be measured (see also chapter 4.5.4.3 page 19 for this). Voltage converters must then be
designed so that a nominal voltage of 1V~ results on the secondary side. The internal
resistance of the measurement inputs is 7540 Ohms; this information can also be utilized for
voltage converters using an accordingly computed series resistance.
The converter type and the converter sizes may be set via a PC program and bus system.
7.3.4
Power and Energy Measurement
If one electrical current converter is connected to measurement input 1, and a voltage
converter is connected to measurement input 2, and both are correctly configured via a PC
program and bus system, one may also execute a (single-phase) power and energy
measurement (see also chapter 4.5.4.3 page 19 for this). The reset of the energy counter
and also of the operating time counter is possible via a PC program. Furthermore, the third
measurement input can also be used in a random manner.
The following figure displays the actual value window box of the PC program for power and
energy measurements.
