3BHE009681R0101 GVC750BE101 ABB Excitation control of medium and high voltage frequency conversion board

Description

df/dt
Rate-of-change of frequency pick-up setting.
Inadmissible settings:

df/dt = 0

df/dt > 0 for absolute frequency settings < fN

df/dt < 0 for absolute frequency settings > fN.
Frequency
Setting of the absolute frequency enabling criterion.
Operation for overfrequency or underfrequency is determined
by the absolute frequency setting:

Underfrequency for frequency settings < fN

Overfrequency for frequency settings > fN
The absolute frequency criterion is disabled for a setting of
‘Frequency’ = 0. In this case, tripping is dependent solely on
the rate-of-change setting df/dt.
Inadmissible settings:

Frequency = fN

Frequency < fN – 10 Hz

Frequency > fN + 5 Hz.
BlockVoltage
Pick-up setting for undervoltage blocking (reset ratio approx.
1.05, reset time approx. 0.1 s).
Delay
Delay from the instant the function picks up to the generation
of a tripping command.
VoltageInp
defines the voltage input channel. All voltage inputs may be
selected with the exception of the special voltage inputs for
the 100% ground stator fault protection.
Blocked (U<)
signals when the function is blocked by the undervoltage
criterion.
BlockInp
defines the input for an external blocking signal.
F: – enabled
T: – disabled
xx: – all binary inputs (or outputs of protection
functions).
Trip
Output for signalling tripping.