P44x/EN AP/E33
Application Notes
Page 76/220
MiCOM P441/P442 & P444
Time
Z1,tZ1
Z2,tZ2
Zp,tZp
Z3,tZ3
Z4, tZ4
I>1
I>2
Reverse
Forward
P3069ENa
FIGURE 42 - TIME GRADING OVERCURRENT PROTECTION WITH DISTANCE PROTECTION (DT
EXAMPLE)
I>1 and I>2 Time Delay VTS
The I>1 and I>2 overcurrent elements should be set to mimic operation of distance
protection during VTS pickup. This requires I>1 and I>2 current settings to be calculated to
approximate to distance zone reaches, although operating non-directional. If fast protection
is the main priority then a time delay of zero or equal to tZ2 could be used. If parallel
current-based main protection is used alongside the relay, and protection discrimination
remains the priority, then a DT setting greater than that for the distance zones should be
used. An example is shown in Figure 43.
I phase
P0483ENa
t
I 1>
I 2>
tI1>
tI2>
Trip
No trip
FIGURE 43 - TRIPPING LOGIC FOR PHASE OVERCURRENT PROTECTION
I>3 Highset Overcurrent and Switch on to Fault Protection
The I>3 overcurrent element of the P441, P442 and P444 relays can be Enabled as an
instantaneous highset just during the TOR/SOTF period. After this period has ended, the
element remains in service with a trip time delay setting I>3 Time Delay. This element
would trip for close-up high current faults, such as those where maintenance earth clamps
are inadvertently left in position on line energisation.
The I>3 current setting applied should be above load current, and > 35% of peak
magnetising inrush current for any connected transformers as this element has no second
harmonic blocking. If a high current setting is chosen, such that the I>3 element will not
overreach the protected line, then the I>3 Time Delay can be set to zero. It should also be
verified that the remote source is not sufficiently strong to cause element pickup for a close-
up reverse fault.
Содержание MiCOM P441
Страница 1: ...MiCOM P441 P442 P444 Numerical Distance Protection VC2 x Technical Guide P44x EN T E44...
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Страница 427: ...Installation P44x EN IN E33 MiCOM P441 P442 P444 INSTALLATION...
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Страница 439: ...Commissioning P44x EN CM E33 MiCOM P441 P442 P444 COMMISSIONING...
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Страница 495: ...Commissioning Test Record Sheets P44x EN RS E33 MiCOM P441 P442 P444 COMMISSIONING TEST RECORD SHEETS...
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Страница 521: ...Courrier Data Base P44x EN GC E44 MiCOM P441 P442 P444 CONFIGURATION MAPPING...
Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
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