Sel 411L - Page 442

P.3.334
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Protection Application Examples
Global Settings
Choose appropriate names for the Station and Relay ID.
We would have the following at Relay S:
SID := Station S Station Identifier (40 characters)
RID := Relay S Relay Identifier (40 characters)
We would have the following at Relay R:
SID := Station R Station Identifier (40 characters)
RID := Relay R Relay Identifier (40 characters)
We would have the following at Relay T:
SID := Station T Station Identifier (40 characters)
RID := Relay T Relay Identifier (40 characters)
The terminal has a circuit breaker-and-a-half configuration. Therefore,
configure the SEL-411L for two circuit breakers.
We would have the following at all relays:
NUMBK := 1 Number of Breakers in Scheme (1, 2)
Choose appropriate names for the circuit breakers.
BID1 := Circuit Breaker Breaker 1 Identifier (40 characters)
Select the nominal frequency and phase rotation.
NFREQ := 60 Nominal System Frequency (50, 60 Hz)
PHROT := ABC System Phase Rotation (ABC, ACB)
Breaker Monitor
Set the relay to indicate that both circuit breakers are three-pole trip type.
We would have the following at all relays:
BK1TYP := 3 Breaker 1 Trip Type (Single-Pole = 1, Three-Pole = 3)
The SEL-411L uses normally open auxiliary contacts from the circuit
breakers to determine whether each pole is open or closed.
52AA1 := IN201 A-Phase N/O Contact Input-BK1 (SEL
OGIC control
equation)
Group Settings
Line Configuration
In this application, both CTs have the ratio listed in Table 3.168.
We would have the following at Relay S:
CTRW := 200 Current Transformer Ratio - Input W (1–50000)
We would have the following at Relay R:
CTRW := 160 Current Transformer Ratio - Input W (1–50000)