Aleen Mohammed

Aleen brings a unique skillset in that he has six years of experience as a utility consultant and five years of experience as an engineer at a public utility. In these roles, he created physical design drawings, protection & control drawings, and SCADA drawings for numerous substations and successfully managed projects as a lead engineer to meet scope, schedule, and budget requirements. Aleen also has experience in conducting system studies for industrial facilities to determine available short-circuit current to specify equipment, arc-flash hazard study using IEEE 1584 to specify PPE, and load flow studies to specify capacitors. Besides work, he has contributed to the IEEE 1584 standard and PJM’s (Designated Entity) substation standards.

Arc Flash Hazard Study – 5 Ways You Can Ruin It

The complete article written by Steve Coleman and Aleen Mohammed (PeGuru admin) is published in the Electrical Construction & Maintenance magazine. Read this article on ECMweb at: Article Abstract: If you are conducting an arc flash study, you are probably using one of the many software packages that can perform the analysis for you …

Arc Flash Hazard Study – 5 Ways You Can Ruin It Read More »

Arc flash vs the HRC4 - 40Cal suit

Arc Flash Hazard Study – The Basics

Arc flash hazard is a huge concern in areas where you are operating medium voltage (1kV – 34kV) and low voltage (less than 1kV) equipment. Mostly because, when you inadvertently initiate a fault, an arc flash ensuing it releases enormous amount of heat energy. The composition of this arc includes molten bits of copper or aluminium busbar or cable.

Arc flash vs the HRC4 - 40Cal suit

Direct Transfer Trip Scheme

Direct Transfer Trips (DTT) are initiated from station relays when a serious event occurs in the substation. Some of these events are breaker failure, bus faults, transformer failure, etc. A lockout relay (86 device) is assigned to each event.

Direct Transfer Trip

Basics of Pilot Relaying & Application Considerations For Transmission Line Protection

Pilot relaying refers to the communication network implemented on the high voltage transmission line (T-line) to transmit “trip or don’t trip” signal to and fro between two or more substations. The intent here is to trip the circuit breakers as fast as possible when a fault strikes the T-line, therefore, protecting it.

Wave Trap with Corona Fittings

Directional Comparison Blocking Scheme

The Directional Comparison Blocking (DCB) scheme is the most popular pilot relaying scheme, implemented to protect high voltage power lines. This scheme is more dependable than a permissive transfer trip scheme because it trips the breaker even when there is no carrier signal from the remote end pilot relay. Let’s dive into details.

Fault Zones
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