Application; Signals - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.1.8
4.2.1.9
408

Application

EFxPTOC is designed for protection and clearance of earth faults in distribution and
sub-transmission networks where the neutral point is isolated or earthed via a
resonance coil or through low resistance. It also applies to solidly earthed networks
and earth-fault protection of different equipment connected to the power systems,
such as shunt capacitor bank or shunt reactors and for backup earth-fault protection of
power transformers.
Many applications require several steps using different current start levels and time
delays. EFxPTOC consists of three different protection stages.
• Low EFLPTOC
• High EFHPTOC
• Instantaneous EFIPTOC
EFLPTOC contains several types of time-delay characteristics. EFHPTOC and
EFIPTOC are used for fast clearance of serious earth faults.

Signals

Table 454: EFLPTOC Input signals
Name Type
IRES SIGNAL
BLOCK BOOLEAN
ENA_MULT BOOLEAN
Table 455: EFHPTOC Input signals
Name Type
IRES SIGNAL
BLOCK BOOLEAN
ENA_MULT BOOLEAN
Table 456: EFIPTOC Input signals
Name Type
IRES SIGNAL
BLOCK BOOLEAN
ENA_MULT BOOLEAN
Table 457: EFLPTOC Output signals
Name Type
OPERATE BOOLEAN
START BOOLEAN
Default Description
- Residual current
0=False Block signal for activating the blocking mode
0=False Enable signal for current multiplier
Default Description
- Residual current
0=False Block signal for activating the blocking mode
0=False Enable signal for current multiplier
Default Description
- Residual current
0=False Block signal for activating the blocking mode
0=False Enable signal for current multiplier
Description
Operate
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1MRS759142 C
REX640
Technical Manual