ERL F-PRO 5100, Руководство пользователя

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D02416R04.00 F-PRO 5100 User Manual 4-1
4 Protection Functions and Specifications
Protection and Recording Functions
This section describes the equations and algorithms that define the F-PRO pro-
tection functions. The inverse time overcurrent functions have an alarm output
where their pickup level has been exceeded. Devices 27, 59, 50LS, 50BF, 81,
50, 50N, 46050, 32 and ProLogic have user-settable intentional delay. When
an alarm occurs, the front alarm LED turns on and an output contact closes, if
you have selected this option in the output matrix settings. The alarm indica-
tion resets when the function is allowed to reset.
50/51/67 Phase
Overcurrent
Phase Overcurrent provides protection to the line. You can define forward, re-
verse or non-directional control on either 50 or 51 functions.
You can apply inverse and instantaneous overcurrent protection on the line
currents with this function. If ac current inputs are applied to the relay from
ring bus breakers, this current is summated to represent the total line current
and is used with this overcurrent function. You can set directional control of
50/51. If voltage is lost, the element becomes non-directional.
The fault location allows the function to initiate a fault location if it operates.
Device 51 provides three IEC inverse time curve types, three IEEE inverse
time curve types of overcurrent protection and one user-defined curve. The
equation and the parameters of Device 50/51/67 are listed below.
ProLogic control can be used to supervise the inverse time integration of the
51.
Table 4.1: IEC and IEEE Curves
# Characteristic A B p TR
1
IEC Standard Inverse 0.14 0 0.02 13.50
2
IEC Very Inverse 13.5 0 1.0 47.30
3
IEC Extremely Inverse 80.0 0 2.0 80.00
4
IEEE Moderately Inverse 0.0103 0.0228 0.02 0.97
5
IEEE Very Inverse 3.922 0.0982 2.0 4.32
6
IEEE Extremely Inverse 5.64 0.0243 2.0 5.82
7
User-defined
0.001 to
100.0 0.0 to
10.0 0.01 to
10.0 0.1 to
100.0
* These constants are copied from the IEEE standards; they are not given in the
IEC standard.