Protection Functions
PRS-7367 39
3.2.2.3 51PVT
The overcurrent protection in this relay provides phase overcurrent protection for VT Circuit
Failure within dependent definite time (DT) and inverse definite minimum time (IDMT)
characteristics. The overcurrent module, phase selection module, time characteristic settings
apply to all three phases and are independent from each other. The operate time characteristics
can be selected to be either definite time (DT) or inverse definite minimum time (IDMT).
Configuring the relevant settings can enable or disable the corresponding protection.
The principle is same as the 51P except 51PTV is just only enabled when VTS alarm.
Figure 3.2-5 The initiation logic diagram for 51PVT
The function Functional module diagram is same as 51P.
3.2.3 50/51P Application Scope
51P is used for single-phase, two-phase and three-phase non-directional overcurrent and
short-circuit protection. The applications of 51P include but are not limited to:
• Selective overcurrent and short-circuit protection of feeders
• Backup overcurrent and short-circuit protection of power transformers and generators
• Overcurrent and short-circuit protection of various devices connected to the power system
• General backup protection
• Overcurrent protection when VTS alarm
3.2.4 50/51P Settings
In the following table, i is the protection stage number, it can be set according to the requirements.
Table 3.2-3 50P settings
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