Energizing Check - ABB Relion Technical Manual

1MRK 502 048-UUS A
12.1.7.4
12.1.7.5
Technical manual

Energizing check

Voltage values are measured in the IED and are available for evaluation by the
Synchronism check function.
The function measures voltages on the busbar and the line to verify whether they are live
or dead. To be considered live, the value must be above 80% of set UBase selected for
GblBaseSelBus or GblBaseSelLine and to be considered dead it must be below 40% of set
UBase selected forGblBaseSelBus or GblBaseSelLine.
The frequency on both sides of the circuit breaker is also measured. The frequencies must
not deviate from the rated frequency more than +/-5Hz.
The Energizing direction can be selected individually for the Manual and the Automatic
functions respectively. When the conditions are met the outputs AUTOENOK and
MANENOK respectively will be activated if the fuse supervision conditions are fulfilled.
The output signal can be delayed independently for MANENOK and AUTOENOK
conditions. The Energizing direction can also be selected by an integer input AENMODE
respective MENMODE, which for example, can be connected to a Binary to Integer
function block (B16I). Integers supplied shall be 1=off, 2=DLLB, 3=DBLL and 4= Both.
Not connected input with connection of INTZERO output from Fixed Signals
(FIXDSIGN) function block will mean that the setting is done from Parameter Setting
tool. The active position can be read on outputs MODEAEN resp MODEMEN. The
modes are 0=OFF, 1=DLLB, 2=DBLL and 3=Both.
The inputs BLOCK and BLKENERG are available for total block of the complete
SESRSYN (25) function respective block of the Energizing check function. TSTENERG
will allow testing of the function where the fulfilled conditions are connected to a separate
test output.
Fuse failure supervision
External fuse failure signals or signals from a tripped fuse switch/MCB are connected to
binary inputs that are configured to the inputs of SESRSYN (25) function in the IED.
Alternatively, the internal signals from fuse failure supervision can be used when
available. There are two alternative connection possibilities. Inputs labelled OK must be
connected if the available contact indicates that the voltage circuit is healthy. Inputs
labelled FF must be connected if the available contact indicates that the voltage circuit is
faulty.
The VB1OK/VB2OK and VB1FF/VB2FF inputs are related to the busbar voltage and the
VL1OK/VL2OK and VL1FF/VL2FF inputs are related to the line voltage. Configure
them to the binary input or function outputs that indicate the status of the external fuse
failure of the busbar and line voltages. In the event of a fuse failure, the energizing check
function is blocked. The synchronism check function requires full voltage on both sides,
thus no blocking at fuse failure is needed.
Section 12
Control
355