OIL LINK UNITHIGH FUSE UNIT Oleh RAIS BIN

OIL LINK UNIT/HIGH FUSE UNIT Oleh RAIS BIN MAAT Ketua Program Kejuruteraan Elektrik

APA ITU OLU/HFU • Satu pengasing (isolator) yang boleh menyambung dan memutuskan bekalan 11 k. V secara manual sahaja • Sebahagian daripada sistem gegelang sistem pembahagian 11 k. V • Menggunakan minyak sebagai interrupting medium • Tidak boleh membuka dan menutup jika terdapat litar pintas

SUBSTATION GEN MSB Tx RMU

OLU/HFU/OLU

RMU

C. BREAKER

RMU 11 KV Rating k. V 500 k. VA 12 1000 k. VA 12 Withstand voltage 1 minute Impulse withstand voltage Frequency k. V rms k. V Hz 28 75 50 Load Break Switch Rated current disconnector Fuse switch Rated current Fuse rating nos A A 2 630 1 200 63 2 630 1 200 80 Rated voltage Unit

DISTRIBUTION TRANSFORMER Rating Voltage ratio at no load Off circuit tapping Withstand voltage 1 minute Impulse withstand voltage Frequency Vector group Type of cooling Unit 500 k. VA 1000 k. VA V 11/. 433 % 2. 5, 5 k. V 28 28 k. V 75 75 Hz 50 50 Dyn 11 ONAN

L. V BOARD Rating Rated current Rated voltage Incoming disconnector Outgoing Fuseway at 20 C Outgoing fuse rating C. T ratio (class 0. 2) MD meter P. F meter k. Wh meter Unit 500 k. VA 1000 k. VA A 800 1600 V 1000 A 800 1600 A 400 A 160 800/5 A 1600/5 A nos 3 3 nos 1 1

ENCLOSURE Internal Arc testing IEC 1330 18. 4 k. A 1 sec Clause 6 Temperature rise test IEC Class 10 enclosure 1330 Clause 4. 1 Index Protection (IP) IP 35 Sound Level test 60 d. BA Material/Thickness Electro Galvanised sheet/3. 0 mm Hot dipped Galvanised CChannel Base Frame

OLU/HFU Oil Link Unit High Fuse Unit

OIL LINK UNIT

HIGH FUSE UNIT

OLU

KEDUDUKAN OLU • • OFF ON BUSBAR EARTHED CABLE EARTH and LOCKED

KEDUDUKAN HFU • • • ON OFF BUSBAR EARTHED FUSE EARTHED CABLE EARTHED

KEDUDUKAN KABEL • ON • OFF • EARTHED

OLU ON

OLU OFF

CABLE EARTH SWITCH OFF – CABLE IS NOT EARTHED

CABLE EARTH SWITCH ON – CABLE IS EARTHED

CABLE EARTHED

HIGH FUSE UNIT • Consist of a switch disconnector or a circuit breaker to connect and disconnect supply from busbar • Followed by 3 nos HT fuses for overcurrent protection for transformer • Followed by HT cable to be connected to transformer

POSITIONS OF HFU • • • ON OFF EARTHED FUSE EARTH OFF FUSE EARTH ON

CABLE EARTH, FUSE EARTH

CABLE OFF, FUSE EARTHED

SWITCH OFF, CABLE ON, CABLE IS NOT EARTH