Substation Primary Construction & Maintenance
PowerNet primary group is experienced in all forms of brown and green field construction. PowerNet has established a strong reputation for its quality of work and attention to detail.
PowerNet can offer the Supply and installation of all steelwork, including termination structures, equipment support structures bus bar supports, bus bars, cable ladder etc
The Primary group specialise in the setting up, adjustment, alignment and maintenance of various types of Transmission and Distribution equipment;
- HV Circuit breakers SF6 & Oil
- Indoor switchgear
- Disconnect Switches – Local and remote
- Earth Switch – local & remote
- Power Transformers
- Auxiliary Switchgear
- Capacitor and Reactor Banks
- Instrument Transformers
- Earth grid
- Substation Overhead line work
- Rigging Steel structures and Bus erection
- Custom steel Fabrication
Substation Secondary Construction
PowerNet Constructions secondary team is made up of experience electrician’s offers an end to end secondary solution for green field & brown field sites.
PowerNet capability’s are:
- Supply, installation and connection of all electrical cabling and wiring
- Modifications of complex in service electrical systems
- Manufacture, supply and installation of AC auxiliary supply and distribution, including control panels, associated switchgear transformers etc.
- Manufacture, supply and installation of DC supply and distribution, including control panels, associated switchgear, batteries & chargers
- Manufacture, supply and installation of control & protection equipment
- SCADA, SCIMIS & HMI equipment
Underground HV Cable Jointing & Hauling
PowerNet Underground group is experienced in all forms of brown and green field construction underground installations. PowerNet capability covers all aspects of HV and LV cable installation, cable jointing, termination and service of paper-lead, SWA, Polymeric & XLPE up to 66KV, and are skilled in the use of cold/heat shrink, jointing methods.
Testing & Commissioning
PowerNet’s primary test team have a broad range of experience in condition monitoring, plant diagnostics & pre commissioning and commissioning of primary plant up to 500kV.
Our Primary High End Test Services include:
DC winding resistance, demagnetization, Dynamic load tap changer diagnostics, Transformer turns ratio, vector group, Leakage reactance / short circuit impedance, Transformer, bushing: power / dissipation factor + insulation capacitance, Insulating fluids: power / dissipation factor, Excitation current per tap, Frequency response of stray losses (FRSL), Surge arrestors: leakage current and watt losses
C T ratio, burden, CT excitation curve (knee point),Polarity, Accuracy limiting factor (ALF) test, CT ratio with voltage, CT winding resistance, CT voltage withstand test, Power / dissipation factor (tan δ) test
VT ratio, polarity and burden, secondary voltage withstand test, Polarity check, VT electronics, Power / dissipation factor (tan δ) test
Ground grid impedance for large & small systems, Step and touch voltage, Soil resistivity, Integrity check of grounding connection, Reduction factor / current split factor, Measure multiple current paths
Switchgear,GIS and Circuit Breaker Testing
Contact resistance, Bushing: power / dissipation factor (tan δ) + insulation capacitance, Overcurrent relays with primary injection, Power / dissipation factor (tan δ) + Insulating fluids: power / dissipation factor, Withstand test.
HV Line & Underground Testing
PowerNet has an experienced team to cater for all power line and HV cable testing and diagnostic.
HV Cable & Line Testing
Cable Fault Location, VLF, Hipot, Insulation resistance, Line impedance and k-factor, Mutual coupling, Positive or zero sequence impedance
Distribution Field Devices
ACR’s, Sectionalises, Regulators, Capacitor Banks
PowerNet Secondary testing division provides complex protection testing and diagnostic across all protections schemes in the power industry:
- Generator Prot
- Line Prot
- Transformer Prot
- Line Diff
- CB Mang
- Line Diff
Standard relay calibration and verification testing of High Burden and Microprocessor relays, Protection scheme testing using State Simulation to provide End to End testing of Communication Based Schemes with GPS time syncing, Protection and control testing of transmission terminal stations, distribution zone substations stations, Protection and control testing of distribution field devices, Fault Finding in Low Voltage protection and control circuits.