Dead Line Detection - ABB Relion Technical Manual

Section 11
Secondary system supervision
11.1.7.3
11.1.7.4
338

Dead line detection

A simplified diagram for the functionality is found in figure 159. 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 159: Simplified logic diagram for Dead Line detection part
Main logic
A simplified diagram for the functionality is found in figure 160. 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.
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
1MRK 502 048-UUS A
AllCurrLow
DeadLineDet1Ph
DLD1PH
OR
AND
AND
DLD3PH
AND
ANSI0000035-1-en.vsd
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