PROJECT DETAILS

• 485MW Zarqa power plant is a combined-cycle gas turbine (CCGT) power plant being developed in Zarqa, the Kingdom of Jordan.
• The power plant run on dual-fuel. The primary fuel being used to power the plant is natural gas.
• Jordan’s National Electric Power Company (NEPCO) has commissioned the 485MW ACWA Power Zarqa combined cycle power plant
• The power generated from the project is sold to National Electric Power under a power purchase agreement for a period of 25 years.
• The IPP supports Jordan’s Vision 2025 to boost economic growth and the National Energy Strategy, which aims to boost power generation capacity by 40% by 2020.
• Client has entrusted to perform The Power System Studies for their entire plant for electrical power distribution network.

PLANT ELECTRICAL SYSTEM DESCRIPTION

485MW Combined Cycle Gas Turbine (CCGT) Power Plant

• The 485MW Combined cycle power plant consists of three gas turbine generators with a capacity of 124.1MW each and one steam turbine generator with a capacity of 183MW.
• To facilitate transmission, the power is stepped-up to 132kV using 4Nos. transformers, with capacities of 3x160MVA and 1x220MVA for gas turbines and steam turbine respectively.
• The Auxiliary network consists of 6.6kV, 0.4kV MV and LV Switchgears, Distribution Panels

SCOPE

The scope covers the Power system studies for 485MW Combined Cycle Gas Turbine (CCGT) Power Plant

• Load flow study
• Short circuit study
• Relay Coordination Study
• Arc Flash study

SIMULATION SOFTWARE

• The Analysis for the Power system studies for 485MW Combined Cycle Gas Turbine (CCGT) Power Plant are performed using ETAP Version 22.
• ETAP – Electrical Transient Analyzer Program developed by ETAP Automation USA. ETAP is so popular for its capability for modelling of power system networks and analysing various studies and Real Time simulations.

STANDARDS FOLLOWED

• Load Flow – IEEE 3002.2 (2018)
• Short Circuit – IEC 60909-0 (2016)
• Protection coordination – IEEE 242 (2001)
• Arc Flash – IEEE 1584 (2018), NFPA 70E (2021)

CHALLENGES FACED

• Electrode configuration for arc flash study was unable to get it for the system

STUDY OBSERVATIONS AND RECOMMENDATIONS

• Voltage profile at all buses are within limits i.e., ±5 % change in voltage as per the standard IEEE 3002.2-2018.
• The loading of all the elements i.e., cable, transformer is found to be within their capability.
• It is observed that the short time rating for all the switchgears are within the limits
• The existing setting are found to be adequate, also the TCC is coordinated with the LV side relay.
• Appropriate Personal Protective Equipment (PPE) Level suit is recommended based on the arc flash study results.

STUDY OBSERVATIONS AND RECOMMENDATIONS

• We had advised to mark arc flash boundary, limited approach boundary and restricted approach boundary lines in front of the panels as per the given results.
• We have provided Arc flash danger labels as deliverable and advised them to place the danger labels on respective switchgears.