Product description
18
ESS Energie Systeme & Service GmbH
VITOBLOC 200 EM-401/549 / EM-363/498
5414 733 0
9/20
09
2.13
Check-list for stand-by operation
The following items should be discussed with the
manufacturer of the block-type thermal power plant
and resolved when planning the systems of the block-
type thermal power plant in stand-by operation or
systems in accordance with VDE 0108.
●
The operating mode of the substitute network
system?
At least one single-line diagram should be
submitted for resolution. The switches to be
triggered by the block-type thermal power plant
should be stated or marked in the plan.
●
What loads have to be supplied?
A list of the highest-performance consumers giving
the outputs and currents. Then the manufacturer of
the block-type thermal power plant defines the
acceptable load connection. It might be necessary
for the customer to provide a load-shedding switch
after consultation.
●
Protective measure: The customer should check
the selectivity of the fuses.
●
The acceptable hot-water return temperature with
block-type thermal power systems for stand-by
operation is no more than 65° C in parallel and
stand-by operation. That means that these block-
type thermal power systems are not only suited to
supplying absorption refrigerating machines.
●
The main gas magnetic valve, the network section
switch and the corresponding open-circuit shunt
release have to have a battery-buffered voltage
supply.
230 V supply voltage for the main gas magnetic
valve or network section switch is not permitted.
The main gas magnetic valve and the drive of the
network section switch are not supplied by the
block-type thermal power plant.
●
The triggering and feedback from the switches are
placed with the customer’s electrician and the
supplier of the block-type thermal power plant.
●
If the higher-level regulation provided by the
customer cannot guarantee automatic restart
without malfunctions after mains malfunction, the
fault messages from the plant systems provided by
the customer such as heating or ventilation may
make the block-type thermal power plant switch off
if there is a mains failure due to such things as a
lack of heat reduction. In this case, the higher-
level regulation should be equipped with a
separate uninterruptible power supply.
●
Stand-by operation should be tested immediately
after starting up the block-type thermal power plant
with everyone involved. If this is not possible, it will
be necessary to have a second date that will be
charged according to expenditures.
●
Sprinkler pump supply is subject to the more
stringent VdS regulations so that is cannot be
assured with the normal design of a block-type
thermal power plant.
●
The appropriate process control technique (such
as multi-module management) should be provided
with active-power load distribution if several
cogeneration modules are used in stand-by
operation.
●
We do not recommend switching the block-type
thermal power plant up to any emergency-power
diesel alternator because the gas and diesel
engines have different regulating characteristics.
The basic prerequisite would be that the
emergency-power diesel alternator is
correspondingly equipped for parallel operation
with other power alternators (such as regulating
alternator voltage or digital inputs for active-power
load distribution on the control system of the diesel
alternator).
