SERVICE MANUAL
R5888B
QUADRAMHO
Chapter 1
Page 21 of 27
19.13
Worked example No. 2
To set distance protection at one end of 60 km double circuit 132kV line on steel
towers for use in a directional comparison blocking scheme.
19.14
Data
Line to be protected: 60km, 132kV double circuit between FEB 132 and March
132 (settings for FEB relay only) using Quadramho Type A.
Line data:
Positive sequence series impedance = Z
1
= 0.44 /69
°
ohms/km
= (0.16 + j0.41) ohm/km
Zero sequence series impedence
= Z
0
= 1.09 /72
°
ohms/km
= (0.34 + j1.03) ohms/km
VT ratio
= 132000/110V
CT ratio
= 500/1A
Source data:
JAN 132
– min source impedance = 3.48 /88
°
max source impedance = 24.9 /88
°
Z
S0
/Z
S1
= 1.0 /0
°
AUG 132
– source impedance = 34.8 /88
°
Z
S0
/Z
S1
= 1.0 /0
°
19.15
Selecting Zone 1 reach
Required Zone 1 reach is to be 80% of FEB – MARCH line impedance
Ratio of secondary impedance to primary impedance
= 110 x 500 = 0.417
1
132 x 10
3
Required Zone 1 reach
= 0.8 x 60 x 0.44 /69
°
ohms primary
= 21.1 /69
°
ohms primary
= 8.8 /69
°
ohms secondary
Jan 132
20km
500MVA
equivalent
source
R
max 5000MVA
min 700MVA
equivalent
source
60km
40km
Feb 132
March 132
Aug 132
Summary of Contents for SHPM 101
Page 1: ...Service Manual Quadramho Distance Protection Type SHPM 101...
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Page 13: ...Quadramho Distance Protection Type SHPM 101 Service Manual Chapter 1 Application...
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Page 209: ...Quadramho Distance Protection Type SHPM 101 Service Manual Chapter 3 Electronic Module Housing...
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Page 211: ...Quadramho Distance Protection Type SHPM101 Service Manual Chapter 4 Installation...
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Page 217: ...Quadramho Distance Protection Type SHPM101 Service Manual Chapter 5 Commissioning Instructions...
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Page 285: ...Quadramho Distance Protection Type SHPM 101 Service Manual Chapter 6 Problem Analysis...
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Page 317: ...Quadramho Distance Protection Type SHPM 101 Service Manual Chapter 7 Relay Identification...
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Page 323: ...Quadramho Distance Protection Type SHPM 101 Service Manual Chapter 8 Special Variations...
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