4ECHNICAL DATA
3$
6
# ' #
,INE DIFFERENTIAL PROTECTION
3ETTING RANGES
STEPS
#URRENT THRESHOLD )
RELEASE BY LOCAL CURRENT
))
. LINE
TO
STEPS
$IFFERENTIAL CURRENT
))
. LINE
TO
STEPS
4RIP DELAY TIME
4
S TO S STEPS S
0ICKUP CHARACTERISTICS
REFER TO &IGURE
3ECOND HARMONIC RESTRAINT
)
F.
)
F.
TO
$ROPOFF RATIO
APPROX TIMES PICKUP )
STAB
!LL CURRENT VALUES ARE BASED ON SYMMETRICAL CURRENT AND STANDARD CT CONNECTION ACCORDING TO &IGURE
4IMES
0ICKUP TIME WITH DOUBLEENDED INFEED
WITH X SETTING VALUE
APPROX MS TO MS
$ROPOFF TIME
APPROX MS
ADDITIONAL DROPOFF DELAY TIME
S TO S STEPS S
4OLERANCES
WITH PRESET PARAMETERS UNDER REFERENCE CONDITIONS
LOCAL PICKUP LIMIT
OF THEORETICAL VALUE BUT MIN
|
)
.
DIFFERENTIAL CURRENT
OF THEORETICAL VALUE BUT MIN
|
)
.
)NFLUENCE VARIABLES
PILOT WIRE RESISTANCE
APPROX PER
¬
LOOP RESISTANCE
AUXILIARY VOLTAGE IN RANGE
5
(
5
(.
TEMPERATURE IN RANGE
^
#
AMB
^
#
+
FREQUENCY IN RANGE
FF
.
0ILOT WIRES
QUANTITY
PREFERABLY SYMMETRICAL TELEPHONE PAIRS
WITH
¬
KM LOOP RESISTANCE AND
N&KM CAPACITANCE
ASYMMETRY CORECORE AT (Z
MAX
MAX LOOP RESISTANCE
¬
PERMISSIBLE INDUCED LONGITUDINAL VOLTAGE
DIRECT CONNECTION OF THE PILOT WIRES
K6
BUT MAX OF THE TEST VOLTAGE OF
THE PILOT CORES
CONNECTION VIA BARRIER TRANSFORMERS
K6
BUT MAX OF THE TEST VOLTAGE OF
THE PILOT CORES
AND MAX OF THE TEST VOLTAGE OF
THE BARRIER TRANSFORMERS
Содержание 7SD502
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