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Protection and Distribution
JEC provides a Distribution & Protection design services for EHV / HV / MV System and our scope includes (but not limited) to the following:
Grid protection studies
• Relay setting calculation.
• Relays Coordination.
• LCC, Control & Protection Schematics and wiring diagram.
• Modification in protection and panel’s scheme
• Relay and Metering One Line Diagram/Protection Logic
Diagram.
• CT and VT Calculation and CT/ VT Interface wiring diagram.
• Signal List, Cable List and Terminal point list.
• Motor relays protection.
• Interlock and inter-trip logics and configuration.
• Protective relays software Setting printout output report.
• Setting,Testing and Commissioning for protection relays.
Distribution System design and Studies.
• Short Circuit and Load flow.
• Cable sizing and selection.
• Electrical duct bank heat calculation.
• Electrical equipment sizing calculation.
• DC load flow and battery sizing calculation.
• Lux calculations for indoor, street and outdoor area.
• Motor starting study.
• Arch flash Analysis.
Insulation Coordination Studies (ICS).
• Selection of Surge Arresters
• Determination of Surge Arrester Parameters
• Energy Capability of Surge Arresters.
• Overvoltage Study.
• Temporary overvoltage study
• Switching overvoltage’s study
• Fast Transient Phenomena
• Modeling of Various Elements of the Network using PSCAD
• Probability Studies of back flashover
• Calculation of Maximum Current, for Direct Lightning
• Very Fast Transient Phenomena using PSCAD Modeling
• Ferro-Resonance study
Grid Impact Statics & Dynamics Studies
• Voltage Fluctuation
• Active Power Control
• Reactive Power Control
• Fault Ride Through
Power Quality Studies.
• Voltage Flicker Calculations
• Harmonics Calculations
• Voltage Unbalance
Grounding System Studies.
• Grounding Conductor size
• Earthling philosophy and earthling transformer sizing.
• Number of ground rods.
• Complete ground system design for EHV / HV / MV / LV
according to IEEE standard.
• Grid Resistance.
• Step and touch potentials.
• Ground potential rise (GPR)
Transient and Lightening Studies.
• Very Fast Transient Phenomena (very fast front).
• Fast Transient Phenomena (fast front).
• Temporary over voltages (low frequency).
• Switching over voltages (slow front).
• Energization/ Re-energization with and without surge arresters.
• Direct Strokes to Phase Conductors.
• Back Flash Over.
• Load rejection.
• Lightening (Shielding) protection layout and details.
• Lightening System design Calculation.
