GE D60 Instruction Manual page 439
Line distance protection system
Hide thumbs
Also See for D60:
- Instruction manual (826 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (502 pages)
Table of Contents
Advertisement
CHAPTER 5: SETTINGS
GROUPED ELEMENTS
Figure 5-119: Application of the PH DIST XFMR VOL/CUR CONNECTION settings
5
— This setting defines the zone reach for the forward and reverse applications. In the non-directional
PHS DIST Z1 REACH
applications, this setting defines the forward reach of the zone. The reverse reach impedance in non-directional
applications is set independently. The reach impedance is entered in secondary ohms. The reach impedance angle is
entered as the
setting.
PHS DIST Z1 RCA
Zone 1 is characterized by transient overreach of less than 5% under source impedance ratios of up to 30. When setting an
under-reaching zone 1 for direct tripping and under-reaching pilot schemes (DUTT, PUTT) also consider other factors as per
rules of distance relaying. In non-directional applications, this 5% transient accuracy applies to the forward reach only.
To achieve specified operating speed of distance elements, the relay internally calculates source to line impedance ratio
(SIR) from fault phasors. In these calculations, line impedance is estimated based on the zone 1 reach setting. Therefore, in
order to calculate the SIR value properly and to maintain the optimal operating speed of the distance elements, set zone 1
reach with a regular 80 to 85% of the line impedance reach setting, even when zone 1 is disabled.
— This setting specifies the characteristic angle (similar to the "maximum torque angle" in previous
PHS DIST Z1 RCA
technologies) of the phase distance characteristic for the forward and reverse applications. In the non-directional
applications, this setting defines the angle of the forward reach impedance. The reverse reach impedance in the non-
directional applications is set independently. The setting is an angle of reach impedance as shown in the distance
characteristic figures earlier. This setting is independent from
, the characteristic angle of an extra
PHS DIST Z1 DIR RCA
directional supervising function.
D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
5-225
Advertisement
Table of Contents
