electrical engineering

What is Single Line Diagram?

Single Line Diagram (aka one line diagram) is an overview drawings of Your electrical installation. It contains main information about your electrical systems like : 

  • Low Voltage, Medium Voltage switchgears
  • Low Voltage panelboards 
  • Cable data 
  • Power transformers data 
  • Circuit breakers, fuses, disconnectors 
  • PV, BESS, Charging points
  • and much more

SLD will give You a lot of answers. It is usually first step for understanding of your electrical installation. Doesn’t matter how big or small it is. Life is easier with SLD. 

Image of an electrical control panel in a facility
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Why do I need it?

Simple answer is to easily operate electrical installation. Once we have SLD, we can :
  • use it for maintenance planning
  • easily point to LOTO points
  • write PTW-Permit to Work
  • reduce time for fault finding
  • identify circuits faster
  • avoid errors during switching
  • reduce costs on Arc Flash Risk Assessment
It is one of the most important element of Your electrical documentation. In most countries it is a legal requirement to have up-to-date single line diagram.

When do I need it?

Every electrical installation should have it documented. If you have some of those problems:
  • It takes ages to identify supply feeder?
  • you need to ask oldest electrician for information's 😉
  • after switching off there is still voltage at the panel 😨
  • Your drawings are old and not relevant
  • You can't find electrical panel in your SLD?
Single Line drawings are must have. If you don't have one, no worry. Our team will help You. SLD will add to many fields and one of it is electrical safety.

What is Protection Testing?

Protection settings are the reason why your circuit breakers trip on faults. Setting up protection settings is next step after Protection Coordination Study It usually requires protection testing and test report. This apply to:

  • ACB-Air Circuit Breakers with digital trip units
  • MCCB-Moulded Case Circuit Breakers 
  • Protection Relays

Testing is carried out with our “proposed” settings and it is verified in the field  for any last minute issues. Reported with “final” file and testing reports per device.  And we care about electrical safety during whole process. 

protection setting
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Why do I need it?

Change it & Test it. Every protection changes needs to be documented. How useful it will be to have proper Single Line Drawings. What it will help with? Adjusting protection settings is just electrical service process. It needs to be combined with Protection Coordination Study so we know why & what it will give to us. Mostly it will:
  • reduce nuisance tripping
  • reduce arc flash incident energy
  • increase selectivity level
  • reduce time for fault finding
  • reduce problems with transformer energizations
  • improve overall protection
Side effect of proper circuit breakers or relay testing is finding if it works properly.

When do I need it?

Every electrical installation should have documented protection testing. If you have some of those problems:
  • You can't find actual protection settings of your HV or LV installation?
  • You don't know when it was last time tested ?
  • You can't energize transformer at first try ?
  • You experience power shut downs of big areas of your factory?
Than you should start with Protection Coordination Study and adjust protection after finding out what is your selectivity level and what can be improved.

Trust and Worth

We help clients in various sectors

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