ABB Remote I/O RIO600 Installation And Commissioning Manual page 125

1MRS757488 H
RIO600
Installation and Commissioning Manual
Table 76: DEFPTOC Technical data
Characteristic
Operation accuracy
Operate time accuracy (DMT)
Multifrequency admittance-based earth-fault indication MFAPSDE
Identification
Description
Multifrequency admittance-based earth-
fault indication
Functionality
The multifrequency admittance-based earth-fault indication function MFAPSDE
provides selective directional earth-fault protection for high-impedance earthed
networks, that is, for compensated, unearthed and high-resistance earthed systems. It
can be applied for the earth-fault protection of overhead lines and underground cables.
The operation of MFAPSDE is based on multifrequency neutral admittance
measurement, utilizing cumulative phasor summing technique. This concept provides
extremely secure, dependable and selective earth-fault protection also in cases where
the residual quantities are highly distorted and contain non-fundamental frequency
components.
Besides faults with dominantly fundamental frequency content, MFAPSDE is
capable of detecting transient and intermittent (restriking) earth faults.
MFAPSDE supports fault direction indication both in operate and non-operate
direction, which may be utilized during the fault location process. The inbuilt transient
detector may be used to identify intermittent earth faults, and discriminate them from
permanent or continuous earth faults.
The operation characteristic is defined by a tilted operation sector, which is
universally valid for unearthed and compensated networks.
The operating time characteristic is according to the definite time (DT).
Value
Depending on the frequency of the current
measured: f = f
n
Current:
±10% of the set value in the range of 4...25 A
±1.5% of the set value in the range of 26...1000 A
Voltage:
±1.5% of the set value
Phase angle: ±3°
(Current measurement based on internal
calculation)
±1.0% of the set value or ±20 ms
IEC 61850 IEC 60617
identification identification
MFAPSDE I0>->Y
Section 6
Commissioning
ANSI/IEEE C37.2
device number
67YN
117