ABB Relion 670 Series Technical Reference Manual page 613

1MRK505222-UUS C
11.2.2.3
11.2.2.4
Technical reference manual
Dead line detection
A simplified diagram for the functionality is found in figure 306. A dead phase
condition is indicated if both the voltage and the current in one phase is below their
respective setting values VDLDPU and IDLDPU. If at least one phase is considered to
be dead the output DLD1PH and the internal signal DeadLineDet1Ph is activated. If all
three phases are considered to be dead the output DLD3PH is activated
Dead Line Detection
IA
IB
IC
IDLDPU
VA
VB
VC
VDLDPU
intBlock
ANSI0000035 V1 EN
Figure 306: Simplified logic diagram for Dead Line detection part
Main logic
A simplified diagram for the functionality is found in figure 307. The fuse failure
supervision function (SDDRFUF) can be switched on or off by the setting parameter
Operation to Enabled or Disabled.
For increased flexibility and adaptation to system requirements an operation mode
selector, OpModeSel, has been introduced to make it possible to select different
operating modes for the negative and zero sequence based algorithms. The different
operation modes are:
• Disabled; The negative and zero sequence function is disabled
• V2I2; Negative sequence is selected
• V0I0; Zero sequence is selected
Secondary system supervision
a
a<b
b
AND
a
a<b
b
a
a<b
b
AND
a
a<b
b
AND
a
a<b
b
AND
a
a<b
b
Section 11
AllCurrLow
DeadLineDet1Ph
DLD1PH
OR
AND
AND
DLD3PH
AND
ANSI0000035-1-en.vsd
607