ABB RER670 - Settings; Single-Phase Railway Power Transformer Differential Protection T1 PPDIF; Application; Identification

6.1.3.2 Settings
M13052-28 v13
The parameters for the restricted earth fault protection, low impedance function
REFPDIF are set via the local HMI or PCM600.
Common base IED values for primary current (IBase), primary voltage (UBase)
and primary power (SBase) are set in a Global base values for settings function
GBASVAL.
GlobalBaseSel: It is used to select a GBASV
AL function for reference of base
values.
Operation: The operation of REFPDIF can be switched On/Off.
IdMin: The setting gives the minimum operation value. The setting is in percent of
the IBase value of the chosen GlobalBaseSel. For function operation, the neutral
current must be larger than half of this value. A recommended setting is 30% of
power transformer-winding rated current for a solidly earthed winding.
ROA: Relay operate angle for zero sequence directional feature. It is used to
differentiate an internal fault and an external fault based on measured zero
sequence current and neutral current. Default value of 60 deg is recommended.
6.2 Single-phase railway power transformer differential
protection T1PPDIF
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6.2.1 Identification
GUID-855CD002-4259-44F3-A491-E7DD119C6525 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Single-phase railway power
transformer differential protection
T1PPDIF
Id/I>
IEC15000166 V1 EN-US
87T
6.2.2 Application
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GUID-2986FDC3-BDBE-4741-9956-6AD89EFAD144 v1
The railway transformer differential protection is a unit protection. The function is
designed to operate properly for 16.7Hz, 50Hz and 60Hz railway power
transformers. It serves as the main protection of railway power transformers in case
of winding failure. Internal electrical faults are very serious and will cause
immediate damage. Short circuits and earth faults in windings and terminals will
normally be detected by the dif
ferential protection. It is possible to detect inter-turn
faults if a sufficient number of turns is short-circuited. Inter-turn faults are the most
difficult transformer winding fault to detect with electrical protections.
Section 6 1MRK 506 375-UEN A
Differential protection
78 Railway application RER670 2.2 IEC
Application manual