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TitleReport 19122016
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Table of Contents
                            COVER.pdf
sld.pdf
sckt_drg.pdf
sckt_flowct.pdf
residualvoltage.pdf
trafo.pdf
linecpsetting.pdf
distance.pdf
trafocpsetting.pdf
33kvFeeder.pdf
33kvswbd1&2setting.pdf
33kvicog.pdf
curves_phase.pdf
curves_ground.pdf
                        
Document Text Contents
Page 1

00 RC CBR

Revision Reviewed
Approve

d

No. of Pages (INCLUDING THIS FRONT PAGE)

CONSULTANT

DOCUMENT ID REPORT NO 08/2016-17 REVISION:  00

CLIENT RENEW SAUR URJA PVT LTD

PROJECT 30MWp SPV PROJECT AT MALKANOOR,TELANGANA

CONTRACTOR LARSEN & TOUBRO,NAVI,MUMBAI

Initial Submission 18/12/2016 CBR

Revision Particulars Date Checked

RENEW SAUR URJA PVT LTD

GURGAON,HARYANA

PROTECTION COORDINATION REPORT

Page 25

0.2 x(3.024+j4.392)x 0.250
0.151 + j 0.220 = 0.26662 55.45

Zero seq Zone 4 reach 20 % of Protected line length x Z0 x CTR/PTR
0.2 x(4.5+j12.96)x 0.104

0.225 + j 0.648 = 0.68595 70.85

max load on line 131.22 Amps
system voltage 132 kV
Z load 580.7992 Ohms
Z load Sec 145.1998
angle 25 deg
line

Resistive Reach Calculations

All distance elements must avoid the heaviest system loading. Taking the 1 A CT
secondary rating as a guide to the maximum load current, the minimum load impedance
presented to the relay would be: Vn (phase-neutral) / In = 132 /3 1

= 76.21024

Typically, phase fault distance zones would avoid the minimum load impedance by a
margin of ≥40% if possible (bearing in mind that the power swing characteristic
surrounds the tripping zones), earth fault zones would use a ≥20% margin. This
allows maximum resistive reaches of 45.72614 for Phase faults

& 60.96819 for Earth faults
Taking a required primary resistive coverage of 7 Ω for phase faults,
and assuming a typical earth fault coverage of 20 Ω, for earth faults
the minimum secondary reaches become:

RPh (min) = 7 x 0.25 1.8 Ω (secondary);
RG (min) = 20 x 0.25 5 Ω (secondary).
RPh (max) = 46 x 0.25 11 Ω (secondary);
RG (max) = 61 x 0.25 15 Ω (secondary).

Resistive reaches could be chosen between the calculated values as shown in Table
The zone 2 elements satisfy R2Ph ≤ (R3Ph x 80%), and R2G ≤ (R3G × 80%).

25

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