Engineering Design - Protection & Control Schematics
 

AIT offer a wide range of design needs, from protection scheme definition and relay selection, through coordination studies and relay settings, substation control & engineering design, to plant maintenance and safety aspects. AIT is fully competent in distribution network from 11kV up to 33kV and transmission network from 132kV up to 500kV.

 

The scope of engineering design services for protection and control undertaken by the AIT shall comprise the following:-

 

1. Preparation of drawings:

a.             General Drawings

b.             Overview Diagram

c.             Block Diagram – Station Level

d.             Block Diagram – Bay Level

e.             Logic Function Diagram

f.              Panel Drawings

g.             Parameter Lists

h.             Station Level Schematics

i.               Bay Level Schematics

j.               Cable Block Diagram

k.             Interconnection Table

 

2. Protection Scheme Design & Philosophy

AIT can provide complete design your protection scheme, whether you are looking for a single line-terminal upgrade, or complete primary and backup protection for a new installation.

 

§         Evaluate and select the protective relays

§       Define the AC and DC inputs and outputs

§     Prepare system single-lines, three-lines, and DC schematics

§     Create wiring diagrams and construction prints

 

3. Protective Relay Setting Calculation

Calculations of protection settings for the following protection applications are covered and AIT also provides client on the report presentation.

 

    i. Transmission Line Protection

§       Line protection using time-stepped or communications-aided schemes

§         Permissive Over Reaching Transfer Trip

§         Permissive Under Reach Transfer Trip

§         Directional Comparison Blocking/Unblocking

§         Line Current Differential

§         Busbar protection

§         Automatic reclosing

 

     ii. Distribution Substation Protection

§         Feeder Overcurrent Protection

§         Feeder Unit Protection

§         Automatic reclosing

§         Transformer protection

 

     iii. Motor and Generator Protection

§         Induction Motor Thermal/Over-current Protection

§         Synchronous Generator Protection

 

 

 

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