Figure - Toshiba GR200 Series Instruction Manual

I out
o
[DIFGL-I]
Figure 2.3-2 Zero-sequence current differential element (I in -I out Plane)
The hatched area is expressed using the following equation
I ≤
out
where the I in should be less than two times a rated current (In); the In is defined in the
VCT of the relay (for more information with regard to the VCT, see the Chapter
description: Transformer module for AC analogue input
Trip delay timer in main logic
(iii)
The DIFGL function has a delay timer to issue a trip signal; thereby, the operation of DIFGL
function can be coordinated with the operations of the other protection relays. The delay timer
is a kind of definite time type; the user can set a delay time for setting [TDIFGL]. Figure 2.3-3
illustrates issuing the trip signal for the TRC function† together with the delay timer.
Operating zone
100 − [ DIFGL_Slope ]
100 + [ DIFGL_Slope ]
[ DIFGL_Slope ] − 100
−
100 + [ DIFGL_Slope ]
- 43 -
[DIFGL-Slope]
2×I n
× I
in
× [DIFGL_I]
).
6F2S1914 (0.49)
I in
(2.3-6)
Technical
GRL200 (Soft 033 & 037)