f307155016 Ring Main Unit
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RING MAIN UNIT
Oleh
RAIS BIN MAAT
Ketua Program Kejuruteraan
Elektrik
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APA ITU RMU
Satu pengasing (isolator) yang bolehmenyambung dan memutuskan bekalan
11kV secara manual sahaja
Sebahagian daripada sistem gegelang sistempembahagian 11kV
Jenis minyak dipanggil OLU (Oil Link
Unit) dan HFU (High Fuse Unit) Jenis gas menggunakan gas SF6
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SUBSTATION
RMUTxMSBGEN
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C.BREAKER
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RMU 11KVRating Unit 500
kVA
1000
kVARated voltage kV 12 12
Withstand voltage 1 minute kV rms 28 28
Impulse withstand voltage kV 75 75
Frequency Hz 50 50
Load Break Switch nos 2 2
Rated current disconnector A 630 630
Fuse switch nos 1 1Rated current A 200 200
Fuse rating A 63 80
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VOLTAGE RATING
12 kV
17.5kV 24kV
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CURRENT RATINGS
400A
630A
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L.V BOARD
Rating Unit 500kVA 1000kVA
Rated current A 800 1600
Rated voltage V 1000 1000
Incoming disconnector A 800 1600
Outgoing Fuseway at 20 C A 400 400
Outgoing fuse rating A 160 160
C.T ratio (class 0.2) 800/5A 1600/5A
MD meter nos 3 3
P.F meter nos 1 1
kWh meter nos 1 1
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ENCLOSURE
Internal Arc testing IEC 1330
Clause 6
18.4 kA 1 sec
Temperature rise test IEC
1330 Clause 4.1
Class 10 enclosure
Index Protection (IP) IP 35
Sound Level test 60 dBA
Material/Thickness Electro Galvanised
sheet/3.0mm
Base Frame Hot dipped Galvanised C-
Channel
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VOLTAGE INDICATOR
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