ABB Remote I/O RIO600 Installation And Commissioning Manual page 138

Section 6
Commissioning
130
Uo
Io
Peak
Detection
GFC release
Operate
Delay Timer
Reset Delay
Timer
MFAPSDE_InEF
MFAPSDE_St
MFAPSDE_Oper
Reset delay time
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
Operate delay time
Installation and Commissioning Manual
1MRS757488 H
RIO600