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9/99
Phase Instantaneous Overcurrent Element 50P-3 (3I>>3) - Level 3, High set
Table 1-5. 50P-3 (3I>>3) Characteristics
50P-3 Parameter
Pickup
The 50P-3 element is disabled in the factory default settings.
the relay such as the 32. To operate an output relay with the 50P-3 only, a programmable output contact must be
mapped to operate on the 50P-3 element only. See the "Programmable I/O" Section for more details. The pickup level
of 50P-3 is set as a multiple of the 51P pickup (see Table 1-5). The timing of the 50P-3 is not selectable and trips
instantaneously with no intentional time delay. The 50P-3 pickup is set in the Primary, Alternate 1, and Alternate 2
settings groups. For the 50P-3 element to operate the "Trip" contact, it must be selected in the "Master Trip Output"
mapping (see "Programmable Master Trip Contact" later in this section). 50P-3 is set by factory default to operate the
"Trip" contact.
50P-3 tripping can be enabled or disabled in each step of the reclose sequence. See "Reclosing" later in this section for
more details. When the Two Phase 50P tripping function is selected, the 50P-3 element trips only when two or three
phases exceed the pickup setting and does not operate for single phase faults. This is applicable where instantaneous
tripping for ground faults is not desired.
Ground Instantaneous Overcurrent Element 50N-1 (IN>>1) - Level 1, Low set
The 50N-1 function operates when the level of ground current exceeds the pickup level. It is enabled where ground
instantaneous tripping is desired. It is typically set equal to or at a higher pickup level than the ground time over current
Table 1-6. 50N-1 (IN>>1) Characteristics
50N-1 Parameter
Pickup
Instantaneous Curves
See Table 5-1 for the 50N-1 factory default settings.
Contact" later in this section). 50N-1 is factory default to operate the "Trip" contact.
50N-1 tripping can be enabled or disabled in each step of the reclose sequence. See "Reclosing" later in this section for
more details. It can also be supervised (torque controlled) by mapping the "GRD" logical input to a physical input for
external supervision or Logical Output for internal supervision. See the "Programmable I/O" Section for programming
instructions.
When the circuit breaker is closed by an external source such as a control switch or SCADA, the 50N-1 can be disabled
from tripping for a "Cold Load Time". See the "Cold Load Time" Section for more details.
Protective Functions
Range/Curve
0.5 to 20 x 51P setting
Range/Curve
0.5 to 20 x 51N setting
Standard Instantaneous
Inverse Instantaneous
Short Time Inverse
Short Time Ext. Inverse
Definite Time
website:www.abb.com/papd
ABB Distribution Protection Unit 1500R
The 50P-3 function operates when the level
of any phase current exceeds the pickup level.
50P-3 is typically used to establish high set
Increment
instantaneous overcurrent protection. The
50P-3 setting is often used to block reclosing
0.1x
at high levels of fault current, or as a level
detector supervised by another function within
Time Dial
Increment
0.1x
No Delay
1 to 10
0.1x
1 to 10
0.1x
1 to 10
0.1x
0 to 9.99
0.01
pickup. The pickup
level of 50N-1 is set as
a multiple of the 51N
pickup. The timing of
the 50N-1 element var-
ies depending upon
which curve is selected
(see Table 1-6).
The
50N-1 pickup, curve
type, and time dial are
all set in the Primary, Al-
ternate 1, and Alternate
2 settings groups. For
the 50N-1 element to
operate the "Trip" con-
tact, it must be selected
in the "Master Trip Out-
put" mapping (see "Pro-
grammable Master Trip
1-5
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