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
|