Dead Line Detection - ABB REL650 series Technical Manual

Section 10
Secondary system supervision
10.2.7.3
10.2.7.4
340

Dead line detection

A simplified diagram for the functionality is found in figure 160. 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 160: Simplified logic diagram for Dead Line detection part
Main logic
A simplified diagram for the functionality is found in figure 161. 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 506 335-UUS A
AllCurrLow
DeadLineDet1Ph
DLD1PH
OR
AND
AND
DLD3PH
AND
ANSI0000035-1-en.vsd
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