Functions
2.1 General
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
42
Address 137 U/O VOLTAGE allows activating the voltage protection function with a variety of undervoltage and
overvoltage protection stages. In particular, the overvoltage protection with the positive sequence system of the
measuring voltages provides the option to calculate the voltage at the other, remote line end via integrated com-
pounding. This is particularly useful for long transmission lines where no-load or low-load conditions prevail and
an overvoltage at the other line end (Ferranti effect) is to cause tripping of the local circuit breaker. In this case
set address 137 U/O VOLTAGE to Enabl. w. comp. (enabled with compounding). Do not use compounding
on lines with series capacitors!
For the fault location, besides Enabled and Disabled, you can also determine in address 138 Fault
Locator that the fault distance is output in BCD code (4-bit units, 4-bit tens and 1-bit hundreds, as well as 1-
bit „data valid“) via binary outputs (with BCD-output). A corresponding number of output relays (No. 1143
through 1152 in the configuration matrix) must be made available and routed for this purpose. For double-
ended fault location, address 3807 two ended must be set to ON. Please note that address 160 L-sections
FL is used for the specification of the number of sections into which your line length is divided (e.g. cable over-
head line).
For the trip circuit supervision set at address 140 Trip Cir. Sup. the number of trip circuits to be monitored:
1 trip circuit, 2 trip circuits or 3 trip circuits, unless you omit it (Disabled).
2.1.1.4 Settings
Addr. Parameter Setting Options Default Setting Comments
103 Grp Chge OPTION Disabled
Enabled
Disabled Setting Group Change Option
110 Trip mode 3pole only
1-/3pole
3pole only Trip mode
112 DIFF.PROTECTION Enabled
Disabled
Enabled Differential protection
115 Phase Distance Quadrilateral
MHO
Disabled
Quadrilateral Phase Distance
116 Earth Distance Quadrilateral
MHO
Disabled
Quadrilateral Earth Distance
117 Dis. PICKUP Z< (quadrilat.)
I> (overcurr.)
U/I
U/I/Ï•
Disabled
Z< (quadrilat.) Distance protection pickup
program
119 Iph>(Z1) Disabled
Enabled
Disabled Additional Threshold Iph>(Z1)
120 Power Swing Disabled
Enabled
Disabled Power Swing detection
121 Teleprot. Dist. PUTT (Z1B)
PUTT (Pickup)
POTT
Dir.Comp.Pickup
UNBLOCKING
BLOCKING
Rev. Interlock
Pilot wire comp
Disabled
Disabled Teleprotection for Distance prot.
122 DTT Direct Trip Disabled
Enabled
Disabled DTT Direct Transfer Trip
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