3.4 Primary Commissioning Tests with the Generator
361
7UM62 Manual
C53000-G1176-C149-3
All secondary test equipment must be removed. Connect measurement values. All
installation preparations according to sections 3.1 and 3.2 must have been completed.
Primary tests are performed with the generator.
Order of the Test
Procedure
Primary testing is usually performed in the following order:
−
Short–circuit tests,
−
Voltage tests,
−
Earth fault tests,
−
Synchronization,
−
Tests with the generator connected to the network
The following hints are arranged in this order. All protection functions should be initially
switched
OFF
(condition as delivered from factory) so that they do not influence one
another. During primary testing the functions are progressively switched to being
operative. If a particular protection function is not required at all, it should be “de–
configured” (refer to Section 2.2). It is then treated as
DISABLED
.
Switching on of a particular function can be performed in two different ways. The
setting addresses concerned are shown in the respective sections.
−
Block relay
: The protection function is operative and outputs annunciations
and measured values. However, the trip command is blocked and it is not
transmitted to the trip matrix.
−
Protection function
ON
: The protection function is operative and outputs
annunciations and measured values. The trip command activates the trip relays
which have been marshalled to the protection function. If the protection
command is not marshalled to any trip relay, tripping does not occur.
Preparation
−
Install an EMERGENCY OFF button for direct trip of the excitation
−
Block all protection functions (=
Block relay
)
−
Set the definite or inverse overcurrent protection function roughly to the nominal
generator current, and set the trip to only on the excitation
−
Set the overvoltage protection function roughly to 30 % of the nominal generator
voltage for the short-circuit test, and to roughly 110 % of the nominal voltage for the
voltage tests, as well as to trip on excitation
DANGER!
Current transformer secondary circuits must be short-circuited before the
current leads to the device are disconnected!
If test switches are installed that automatically short-circuit the current transformer
circuits, opening these test switches (placing them in the "Test" position) is sufficient
provided the short-circuit function has been previously tested.
