GFC release
MFAPSDE_InEF
MFAPSDE_St
MFAPSDE_Oper
Peak
Detection
Reset Delay
Timer
Operate
Delay Timer
Reset delay time
Operate delay time
Io
Uo
GUID-1631DBC0-4C26-4E47-B1E2-1A930445DA8F V1 EN
Figure 75:
Example of operation of Transient detector: indication of detected
detection of intermittent earth fault by MFAPSDE_InEF output
(setting Peak Counter Limit = “3”)
Operation logic
Operation of MFAPSDE is applicable to all kinds of earth faults in unearthed and
compensated networks. It is intended to detect all kinds of earth faults regardless of
their type (transient, intermittent, permanent, high or low ohmic). The
Voltage start
value
setting defines the basic sensitivity of the MFAPSDE function.
The operate timer is started in the following conditions.
•
Earth fault is detected by the General fault criteria (GFC).
•
Fault direction equals the
Directional mode
setting.
•
If the
Power direction logic
setting is set to “Enable”, the active power flow
direction must equal the
Directional mode
setting.
•
Estimated stabilized fundamental frequency residual current exceeds the set
minimum operate current level (forward direction
Min Forward Operate Current
Section 6
1MRS757488 H
Commissioning
130
RIO600
Installation and Commissioning Manual
Содержание Remote I/O RIO600
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