GEK-98846A
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4.8 FUSE FAILURE UNIT (FF) (MLP3000)
The fuse failure detector of the voltage transformers is designed to operate when
one or two phases of the alternating voltage is lost. This situation may be interpreted by the
distance measuring units as a fault and provoke a trip in the absence of a fault. Therefore
the detection of a fuse failure blocks any protection trip.
This unit can be disabled by it's corresponding setting.
In addition to this, a digital input allows the exterior blocking of the trips. This input is
used when a MAGNETOTERMICO with auxiliary contact is used in place of fuses in the
voltage circuits. This contact is wired to the mentioned input to avoid an unsuitable trip
during MAGNETOTERMICO operation and the subsequent loss of the voltages.
Figures 10.1 and 10.2 illustrate the algorithm for fuse failure detection.
4.9 RECLOSER (MLP2000 and MLP3000)
The reclosing unit permits up to three reclosing attempts of the line breaker. The
number of attempts is programmable between 0 and 3, with 0 indicating that the reclosing
unit is disabled.
The recloser includes a counter that increments the count each time it reaches the
closing time state.
The MLP recloser includes a set of digital inputs and outputs which permits it's use
with an external protection independent of the MLP.
Logic:
The description of the MLP recloser logic can be seen in figures 11.1, 11.2 and
11.3.
The recloser inputs and outputs are:
Inputs:
- Breaker status (52/b)
-> CC-1
- Initiate reclosing (IR)
-> CC-4
- Reclosing blocked (BR)
-> CC-5
- Reclosing inhibition (INR)
-> CC-8
- Manual block (L/O_ M)
-> Via communications
- Manual unblock (RST_L/O_M)
-> Via communications
The IR and BR signals may arrive from the protection itself or from the exterior via
the contact converters CC-4 and CC-5 respectively.
The 52/b and INR signals arrive via the contact converters CC-1 and CC-8
respectively.
Summary of Contents for MLP1000
Page 94: ...GEK 98846A 93 Figure 1 System diagram with MLP CPR and TTI ...
Page 95: ...GEK 98846A 94 Figure 2 Case dimensions and drilling form 1 rack ...
Page 96: ...GEK 98846A 95 Figure 3 1 External Connections MLP1000 ...
Page 97: ...GEK 98846A 96 Figure 3 2 External Connections MLP1000 ...
Page 99: ...GEK 98846A 98 Figure 3 4 External Connections MLP1000 ...
Page 100: ...GEK 98846A 99 Figure 3 5 External Connections MLP2000 ...
Page 101: ...GEK 98846A 100 Figure 3 6 External Connections MLP2000 ...
Page 103: ...GEK 98846A 102 Figure 3 8 External Connections MLP2000 ...
Page 104: ...GEK 98846A 103 Figure 3 9 External Connections MLP3000 ...
Page 105: ...GEK 98846A 104 Figure 3 10 External Connections MLP3000 ...
Page 107: ...GEK 98846A 106 Figure 3 12 External Connections MLP3000 ...
Page 108: ...GEK 98846A 107 Figure 4 Protection Logic ...
Page 109: ...GEK 98846A 108 Figure 5 1 Trip decision diagram ...
Page 110: ...GEK 98846A 109 Figure 5 2 Trip decision diagram ...
Page 111: ...GEK 98846A 110 Figure 5 3 Trip decision diagram ...
Page 112: ...GEK 98846A 111 Figure 5 4 Trip decision diagram ...
Page 113: ...GEK 98846A 112 Figure 6 1 Z1X protection scheme ...
Page 114: ...GEK 98846A 113 Figure6 2 ACCZ2 Protection scheme ...
Page 115: ...GEK 98846A 114 Figure7 LPU function diagram ...
Page 116: ...GEK 98846A 115 Figure 8 1 ROD function logic ...
Page 117: ...GEK 98846A 116 Figure 8 2 ROD function diagram ...
Page 118: ...GEK 98846A 117 Figure 9 1 DD function logic ...
Page 119: ...GEK 98846A 118 Figure 9 2 DD function diagram ...
Page 120: ...GEK 98846A 119 Figure 10 1 FF function logic ...
Page 121: ...GEK 98846A 120 Figure 10 2 FF function diagram ...
Page 122: ...GEK 98846A 121 Figure 11 1 Recloser diagram ...
Page 123: ...GEK 98846A 122 Figure 11 2 Recloser Diagram ...
Page 124: ...GEK 98846A 123 Figure 11 3 Recloser Diagram ...
Page 125: ...GEK 98846A 124 Figure 12 Fault selector ...
Page 126: ...GEK 98846A 125 Figure 13 Menu Tree Diagram ...
Page 127: ...GEK 98846A 126 Figure 14 MLP3000 Settings and data ...
Page 128: ...GEK 98846A 127 Figure 15 Connection scheme for relay tests ...
Page 129: ...GEK 98846A 128 Figure 16 Power swing diagram function ...
Page 130: ...GEK 98846A 129 Figure 17 Mho Reactance characteristics of the MLP ...
