7.2.2 Application
IP14944-1 v3
SEMOD54734-4 v8
The 1Ph High impedance differential protection function HZPDIF
(87) can be used as:
• Generator differential protection
• Reactor differential protection
• Busbar differential protection
• Autotransformer differential protection (for common and serial windings only)
• T-feeder differential protection
• Capacitor differential protection
• Restricted ground fault protection for transformer, generator and shunt reactor
windings
• Restricted ground fault protection
The application is dependent on the primary system arrangements and location of
breakers, available CT cores and so on.
ANSI05000738-2-en.vsd
3·87
21
3·87
21
52
52
52
ANSI05000738 V2 EN-US
Figure 53: Different applications of a 1Ph High impedance differential protection
HZPDIF (87) function
7.2.2.1 The basics of the high impedance principle
SEMOD54734-153 v9
The high impedance differential protection principle has been used for many years and
is well documented in literature publicly available. Its operating principle provides
very good sensitivity and high speed operation. One main benefit offered by the
principle is an absolute stability (that is, no operation) for external faults even in the
Section 7 1MRK 504 163-UUS A
Differential protection
158 Transformer protection RET670 2.2 ANSI
Application manual
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