Monitored Data; Operation Principle - ABB REG650 Technical Manual

1MRK 502 034-UEN -
Name Values (Range)
ClockNumberW3
ZSCurrSubtrW1
ZSCurrSubtrW2
ZSCurrSubtrW3
5.1.2.5
5.1.3
Technical Manual
Unit
0 [0 deg] -
1 [30 deg lag]
2 [60 deg lag]
3 [90 deg lag]
4 [120 deg lag]
5 [150 deg lag]
6 [180 deg]
7 [150 deg lead]
8 [120 deg lead]
9 [90 deg lead]
10 [60 deg lead]
11 [30 deg lead]
Off -
On
Off -
On
Off -
On

Monitored data

Table 20: T3WPDIF Monitored data
Name
IDL1MAG
IDL2MAG
IDL3MAG
IBIAS
IDNSMAG

Operation principle

The task of the power transformer differential protection is to determine whether a
fault is within the protected zone, or outside the protected zone. The protected zone
is delimited by the position of current transformers (see figure 32), and in principle
can include more objects than just transformer. If the fault is found to be internal,
the faulty power transformer must be quickly disconnected.
Step Default
- 5 [150 deg lag]
- On
- On
- On
Type Values (Range)
REAL -
REAL -
REAL -
REAL -
REAL -
Section 5
Differential protection
Description
Phase displacement between W3 &
W1=HV winding, hour notation
Enable zero sequence subtraction for
W1 side, Off/On
Enable zero sequence subtraction for
W2 side, Off/On
Enable zero sequence subtraction for
W3 side, Off/On
Unit Description
A Magnitude of
fundamental frequency
differential current,
phase L1
A Magnitude of
fundamental frequency
differential current,
phase L2
A Magnitude of
fundamental frequency
differential current,
phase L3
A Magnitude of the bias
current, which is
common to all phases
A Magnitude of the
negative sequence
differential current
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