Early this year Eskom launched the first phase of its two-phase battery energy storage system (BESS) programme with its appointment of two international companies to oversee the design, execution and management of the programme.
The companies, Hyosung Heavy Industries of South Korea and Pinggao Group of China, wasted no time in appointing local engineering, procurement and construction (EPC) contractors to execute the BESS projects comprising the initial phase, which Eskom characterises as the “proof of concept” phase.
This was followed by the awarding of contracts by the EPC contractors to local manufacturers and service providers to provide the equipment and services required for the projects.
For the BESS programme the government has lifted many of the stringent local content requirements that normally apply to state-driven capital projects – such as, for example, the national Renewable Energy Independent Power Producer Procurement Programme (REIPPPP).
“The relaxation of the local content requirements opens the door to suppliers from other parts of the world to participate in the BESS projects, thereby increasing the level of competition that local suppliers have to face. As a local manufacturer we understand that we cannot rely on protectionism and need to compete on a global platform and have structured our manufacturing operations and product offerings accordingly,” said Steve Jordaan, Divisional CEO of ACTOM Power Transformers.
“The fact that the initial BESS projects have unusually short lead times to completion works to the advantage of local suppliers already in good standing with Eskom, as their already approved products are saved from the time-consuming design and approval processes which many overseas suppliers will be obliged to go through. The Developers, EPC’s and ultimate client have the added benefit of local support for the product over the life of the project,” he remarked.
These advantages apply to all the ACTOM Transmission & Distribution divisions that have been awarded contracts to manufacture and supply electrical equipment for BESS projects, namely ACTOM Power Transformers, ACTOM MV Switchgear, ACTOM High Voltage Equipment and ACTOM Distribution Transformers.
In early-September Power Transformers was awarded a contract for the manufacture and supply of three 40MVA power transformers required for the 132kV/22kV collector substation that is currently under construction for the 80MW Skaapvlei project in the Western Cape – the biggest of the BESS projects being undertaken by Pinggao in the current phase. The EPC contractor for Skaapvlei is Midrand-based Proconics.
“The transformers for Skaapvlei are repeat designs of units we’ve previously produced for Eskom. This saves us from having to design and obtain design signoffs on them, so greatly helping to ensure that we’ll be able to manufacture and supply them within the exceptionally short contract period of only seven months,” Steve commented.
MV Switchgear was awarded contracts in June and July for the manufacture and supply of medium voltage primary switchgear and ring main units for the collector substations of three BESS projects being developed under Hyosung’s overall control. These are the 40MW Pongola and 8MW Elandskop projects in Kwazulu-Natal as well as the 20MW Hex project in the Western Cape. The EPC company for Pongola and Elandskop is Roodepoort-based Tractionel Enterprise, while Besamandla of Cape Town is the EPC for Hex.
“The existing 11kV Hex distribution substation’s switchboard, which consists of MV Switchgear’s SBV4E gear, is being extended to serve as the collector substation for the Hex project, for which we are contracted to supply and install four more SBV4E indoor panels,” said Rhett Kelly, the division’s Design & Development Manager.
The primary switchgear to be supplied by MV Switchgear for the 22kV Pongola collector substation comprises nine panels of GMAe gas-insulated fixed pattern indoor switchgear from Schneider Electric, an international producer of low and medium voltage equipment with which ACTOM has a longstanding local value-added reseller (VAR) agreement. For the 11kV Elandskop collector substation the division will supply a four-panel board of its premier brand AMV12 air-insulated withdrawable pattern indoor switchgear.
MV Switchgear’s popular gas-insulated RMV ring main units are to be deployed in all three of the abovementioned BESS projects These comprise six 11kV units for Hex, three 11kV units for Elandskop and twelve 22kV units for Pongola.
“For all three projects we are required to provide custom-designed internal arc classified enclosures to house the various combinations of extensible and non-extensible RMV ring main units, each with a separate low voltage auxiliary compartment to house the protection relay and supervisory control and data acquisition (SCADA) equipment. All the various switchgear products have been through stringent Eskom evaluation processes, including desktop, factory and sample evaluations,” said Rhett.
High Voltage Equipment has been awarded contracts for the supply of various substation equipment for Hyosung’s Pongola, Elandskop and Hex projects as well as Pinggao’s 80MW Skaapvlei and 9.5MW Paleisheuwel projects in the Western Cape, with Proconics of Midrand being the EPC contractor for both. The equipment to be supplied by the division for these five projects comprise disconnectors, voltage & current transformers, circuit breakers and surge arresters ranging from 6,6kV to 132kV.
ACTOM Distribution Transformers was contracted in July 2022 by Besamandla of Cape Town, the EPC for the Hex project in the Western Cape, to supply 11kV 360A 400V NECRT’s for the project’s collector substation. These units are scheduled for delivery in March 2023.
NECRT’s, which are a combination of neutral electromagnetic couplers with neutral earthing resistors and an auxiliary transformer in one, are designed to act as shock absorbers when earthing power transformers with Delta connected windings. They limit the earth fault current under abnormal conditions.
The particular units for the Hex collector substation will be designed to limit the earth fault current to 300A.
Distribution Transformers currently enjoys dominance in the supply of NECRT’s on the Eskom national contract.
