Protection System - 01 Introduction (By CoEE)

Technical sharing on Electrical Protection System by Crux of Electrical Engineering, Malaysia. Presentation dan komentar dalam Bahasa Malaysia (Malay Language)

Youtube link: https://www.youtube.com/watch?v=3C0kHLO1_2A

This video is on 01 Introduction, which is one the following covered topics: ============ 01 Introduction ============ 02 CT and VT 03 Relay Classification 04 Grandfather of all Protection – OCEF 05 Directional OC 06 Differential Protection

Synchronizing Check Relay atau Geganti Pasti Segerakan (ANSI 25)

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Synchro Check Relay (ANSI No. 25)
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Mesti tuan-tuan selalu jumpa relay ni kan? Kebanyakan multi function relay microprocessor/numeric sudah ada built-in dalam relay, masih ada juga yang jenis single function relay khas untuk synchro sahaja. Selalu digunakan untuk memberi permissive untuk CLOSE Breaker antara 2 punca berlainan.

Apa syarat-syarat untuk kita boleh synchro?
1. Voltan mesti lah sama
2. Phase angle mesti lah sama
3. Phase rotation mestilah pada arah yg sama
4. Frequency juga mesti lah sama

Tapi tuan-tuan tengok dalam protection relay, setting untuk function 25 ada beberapa typical setting yg ada. Ini adalah contoh untuk Siemens Reyrolle 7SR2244. Seperti pada gambar.

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7SR2244
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Voltage reference: Vab.
Ini bermakna reference digunakan adalah Voltage red (a) dan yellow (b) phase. Relay jenis ini mempunyai 2 voltage input (1 untuk incomer side - 4 wire (R, Y, B, N dan 1 lagi untuk bus bar - 2 wire sahaja). Jadi bila dipilih setting Vab, belah incomer automatic akan gunakan V_incomer (R-Y). Untuk voltage input 2, memandangkan hanya ada 2 wire sahaja, sambungan dari VT atau PT belah bus bar side harus lah juga menggunakan V_bus (R-Y). Jika tidak memang tidak akan synchro la sampai ke sudah.

ABB REF615 DEMO (Link to ABB)

ABB REF615 DEMO: http://protectionrelays-simulator.abb.com/…/simulator_demo.…

Assalamualaikum dan salam sejahtera semua,

Ni ada satu link bagus untuk interaksi dengan relay ABB jenis REF 615 untuk Feeder.

Antara interaksi yang boleh boleh dilakukan:-

1. Fault simulation (OC, EF, Dir EF)

How To Check IDMT Trip Time (Spot Check) During Relay Testing

Technical sharing on How To Check IDMT Relay Calibration by Crux of Electrical Engineering, Malaysia. 

Link to youtube video: https://www.youtube.com/watch?v=C76d5dTxbGc

Material in English tapi presentation dan komentar dalam Bahasa Malaysia (Malay Language) 

PDF: https://drive.google.com/open?id=1Xb6... 

Excel: https://drive.google.com/open?id=1R0N... 

The topics are on: 

1. Explanation on typical OCEF Relay Calibration report 

2. Introduction to IDMT

Technical Sharing: Fuse by CoEE

Technical sharing on fuse by Crux of Electrical Engineering, Malaysia.

Material is in English tapi presentation dan komentar dalam Bahasa Malaysia (Malay Language)

Material link: https://bit.ly/2yNOnar. It's free, but please give some credit in your website, presentation, video or pictures to www.cruxofee.com if you plan to use it.

The topics are on: 

• Definitions in a fuse rating name plate
• Fuse Characteristic
• Type of Fuses
• Fuse Construction
• Selection of Fuse for Motor, Transformer and Capacitor
• Fuse and Overload/IDMT discrimination i.e. discriminate between fuse and overload/ IDMT OC to protect the contactor / vacuum contactor unit

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Crux of Electrical Engineering
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Email: cruxofee@gmail.com 

Web: http://www.cruxofee.com/
Facebook: https://www.facebook.com/cruxofee/
Youtube Channel: https://bit.ly/2wwtsb8

Ex db, Ex eb, Ex ec what? Where did Ex d, e and nA go?

Electrical Equipment Classification

In approximate terms the Explosion Protection Levels (EPL) Ga, Gb, Gc correspond to the Equipment Categories 1G, 2G and 3G which align with the Zones 0, 1 and 2. The latest IEC standards mean that nA (non sparking) will become ec (for EPL increased - zone 2); e (increased safety) will become eb (for EPL high - zone 1) and d (flameproof) will become db (for EPL high – zone 1). This terminology is mandatory from 2018.

CEE Interview and Written Switching Procedure Experience

SLD for the written switching procedure 

Black colour is what I wrote
Red colour is the correction or further explanation.

Job Sheet: To perform maintenance at Ring Main Unit (2 + 1) at Pencawang Elektrik Kg Jelutong
(RMU 2+1 means 2 feeder and 1 Tx)

Preparation at all substations

1. Wear complete arc flash PPE
2. Note any alarms, trips and conditions of switch gears
3. Ensure rubber mat is available at all time
4. Ensure that HT voltage stick and multimeter are in good working condition.
• the steps above are done at each substation prior to commencing of switching work,

P/E Kg Jelutong
1. Inform OIC
2. At FA NOP

A. Perform voltage measurement at bus bar
a. Must state I.e. measured voltage is at 230VAC ph-n and 400VAC ph-ph within 10%, -6% tolerance for both bus bar and cable 
B. Perform voltage measurement at cable
C. Perform phase rotation check at bus bar
a. Clockwise rotation for both bus bar and cable 
D. Perform phase rotation check at cable
E. Perform phasing check between bus bar and cable
a. 0 VAC for in phase and 400VAC for out of phase