ERL L-PRO 4000, Руководство пользователя

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4 Protection Functions and Specifications
4-38 L-PRO 4000 User Manual D02706R02.30
The breaker failure logic uses a current detector that is user settable in the 50BF
Setting screen to determine whether a pole is open or closed in the range of 0.1
- 50 A secondary. There are two (2) breaker failure functions available per line
breaker with adjustable pickup definite time delays from 0.01 to 99.9 seconds.
In any case, the output of the Breaker Failure function must be set to close out-
put contacts to perform its function. This is done by mapping the BF output to
the appropriate output contact in the Output Matrix screen.
50/51/67 Phase
Overcurrent
Phase Overcurrent provides backup protection to the line. The user can define
directional or non directional control on either 50 or 51 functions.
Device 51 provides 3 IEC inverse time curve types, 3 IEEE inverse time types
of overcurrent protection and one user-defined curve. The equation and the pa-
rameters of Device 50/51/67 are listed below.
The equation of Devices 50/51/67 is given in Equation (3 and 4) below. The
various parameters are defined in Table 4.22: 50/51/67 Phase Overcurrent Set-
tings on page 39.
Table 4.21: IEC and IEEE Curves
No Curve Type A B p TR
1 IEC Standard Inverse 0.14 0.00 0.02 13.5
2 IEC Very Inverse 13.50 0.00 1.00 47.3
3 IEC Extremely Inverse 80.00 0.00 2.00 80
4 IEEE Moderately Inverse 0.0103 0.0228 0.02 0.97
5 IEEE Very Inverse 3.922 0.0982 2.00 4.32
6 IEEE Extremely Inverse 5.64 0.0243 2.00 5.82
7 User-defined [0.001, 1000] [0.0, 10.0] [0.01, 10.0] 0.1, 100
For I > pickup (5)
For I < pickup
(6)
T I
 
TMS B
A
I
Pickup
------------------
 
 
p
1 –
------------------------------------ + =
T I
 
TMS
TR
I
Pickup
------------------
 
 
2
1 –
----------------------------------- =