Alstom MiCOM P846, Technical Manual

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P846/EN IT/D Introduction
(IT) 1-6
MiCOM P846
IT
3. PRODUCT SCOPE
The P846 open line detector relay is designed for the protection of power systems in the
event of a loss of critical power corridors or important tie lines, the loss of which can easily
lead to stability problems. The relay is suitable for application to EHV, transmission and
distribution systems voltage levels where fast detection of network topology changes are
required. The actions that can be taken upon detection of this condition include measures
such as load shedding, generation rejection or switching in of FACTS devices. The relay
also includes a comprehensive range of non-protection features to aid with power system
diagnosis and fault analysis.
3.1 Functional overview
The P846 open line detector contains a wide variety of protection functions. The protection
features are summarized below:
PROTECTION FUNCTIONS OVERVIEW P846
DLO Loss of Power Corridor (open line detection) X
VTS
Voltage transformer supervision (1, 2 & 3 phase fuse failure
detection) to prevent mal-operation of voltage dependent
protection elements upon loss of a VT input signal.
X
Opto Inputs 24
Output relays (order option) 48
Fast hybrid static outputs 4
Rear communication port (KBUS/EIA(RS)485) X
Rear communication port (EIA(RS)485/Optic) Option
Second rear communication port (EIA(RS)232/EIA(RS)485) Option
Time synchronization port (IRIG-B) Option
Dual rated 1A and 5A CT inputs X
Single and three pole tripping applications X
Direct access menu “Hotkeys” X
Multiple password access control levels X
Fault locator X
SOE Event records X
Disturbance recorder X
Circuit Breaker condition monitor X
PSL Graphical Programmable Scheme Logic X
IRIG-B time synchronism Option