GEK-105593C
7
2.
2.
2.
2.
OPERATING PRINCIPLES
OPERATING PRINCIPLES
OPERATING PRINCIPLES
OPERATING PRINCIPLES
2.1. PROTECTION FUNCTIONS
2.1.1. OVERCURRENT UNITS
SMOR system includes the following overcurrent units, all of which can be set and used independently:
•
Phase overcurrent (for three phases):
Time delayed
51 PT (Instantaneous, definite or inverse time)
Instantaneous, High level
50 PH (Instantaneous or definite time delayed)
Instantaneous, Low level
50 PL (Instantaneous or definite time delayed)
•
Ground overcurrent:
Time delayed
51 NT (Instantaneous, definite or inverse time)
Instantaneous, High level
50 NH (Instantaneous or definite time delayed)
Instantaneous, Low level
50 NL (Instantaneous or definite time delayed)
Any unit can be set to be directional or non-directional, independently.
•
Negative sequence overcurrent:
Time delayed
46 PT (Instantaneous, definite or inverse time)
The timed units can be selected using Inverse, Very Inverse, Extremely Inverse curves, or definite time
characteristic. These inverse time curves are shown in Figures 2, 3 and 4 and follow the equation:
K
t = TD
M
∝
- 1
in which:
t
= Time in seconds
TD
= Time Dial of the curve (0.05 for the lower curve of the family and 1 for the upper curve)
M
= Multiples of the pickup value
K,
α
are coefficients which identify the selected curve and which correspond to the following table:
Curve
Characteristic
K
α
αα
α
1
Inverse
0.13
0.02
2
Very inverse
16
1
3
Extremely inverse
96
2
2.1.2. DIRECTIONAL SUPERVISION SETTING
The SMOR system has three phase directional units and one ground directional unit. They are completely
independent on each other, being used to supervise (assuming they are adjusted to do so) the tripping of the
phase and ground overcurrent units, according to the direction of the detected fault (they do not affect the
trip of the negative sequence overcurrent unit). The directional supervision can be adjusted independently for
each of the overcurrent functions of the SMOR system, both for phases and ground.
The phase directional units are polarized by phase-to-phase voltages, while the ground directional unit is
polarized by zero sequence voltage. The characteristic angle of the unit can be independently set for the
phase and ground units.
Summary of Contents for SMOR-B GEK 105593C
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Page 25: ...GEK 105593C 20 FIGURE 5 RECLOSER STATES DIAGRAM 226B2200H1 SUMMARISED ...
Page 51: ...GEK 105593C 46 ...
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Page 88: ...GEK 105593C 83 FIGURES FIGURES FIGURES FIGURES ...
Page 89: ...GEK 105593C 84 FIGURE 1 PANEL DRILLING DIMENSIONS FOR 19 RACK MODELS 226B6086H10 ...
Page 91: ...GEK 105593C 86 FIGURE 3 INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H1 ...
Page 92: ...GEK 105593C 87 FIGURE 4 VERY INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H2 ...
Page 93: ...GEK 105593C 88 FIGURE 5 EXTREMELY INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H3 ...
Page 94: ...GEK 105593C 89 FIGURE 6 RECLOSER PROGRAM FLOWCHART 226B2200H1 ...
Page 95: ...GEK 105593C 90 FIGURE 7 FRONT VIEW FOR 19 RACK MODELS 226B7412H9 ...
Page 96: ...GEK 105593C 91 FIGURE 8 FRONT VIEW FOR 1 2 RACK MODELS ...
Page 97: ...GEK 105593C 92 FIGURE 9 EXTERNAL CONNECTIONS FOR 19 MODELS 189C4101H1 ...
Page 100: ...GEK 105593C 95 FIGURE 13 REAR VIEW FOR 19 MODELS 226B7412H10 ...
Page 102: ...GEK 105593C 97 FIGURE 15 DIMENSIONS DIAGRAM FOR 19 MODELS 226B6086H10 ...
