APT4801
Assignment 3 2025
Unique #:
Due Date: 21 July 2025
Detailed solutions, explanations, workings
and references.
+27 81 278 3372
, QUESTION 1
1. Overview of the Two Eskom Power Stations in Kriel, Mpumalanga
1.1 Kriel Power Station
Overview:
Kriel Power Station is one of Eskom’s older coal-fired power stations, commissioned
in 1979. It was the first in South Africa to be designed for a dry-cooled condenser
system, due to water scarcity in the region. The station uses pulverised coal
combustion technology.
Key Characteristics:
Installed Capacity: ± 3,000 MW
Generation Units: 6 × 500 MW units
Technology: Subcritical steam turbines
Fuel: Bituminous coal from nearby collieries
Cooling: Dry-cooling technology
Main Protection Schemes:
o Generator Differential Protection
o Overcurrent and Earth Fault Protection
o Distance Protection on outgoing feeders
o Transformer Differential and REF Protection
o Generator Transformer Protection
1.2 Matla Power Station
Overview:
Located near Kriel, Matla Power Station is another large coal-fired station
commissioned in the late 1970s. Unlike Kriel, it uses a wet-cooling system and larger
generating units. Matla was built with an emphasis on operational efficiency and
upgraded over the years to support improved environmental standards.
Key Characteristics:
Installed Capacity: ± 3,600 MW
Varsity Cube 2025 +27 81 278 3372
Assignment 3 2025
Unique #:
Due Date: 21 July 2025
Detailed solutions, explanations, workings
and references.
+27 81 278 3372
, QUESTION 1
1. Overview of the Two Eskom Power Stations in Kriel, Mpumalanga
1.1 Kriel Power Station
Overview:
Kriel Power Station is one of Eskom’s older coal-fired power stations, commissioned
in 1979. It was the first in South Africa to be designed for a dry-cooled condenser
system, due to water scarcity in the region. The station uses pulverised coal
combustion technology.
Key Characteristics:
Installed Capacity: ± 3,000 MW
Generation Units: 6 × 500 MW units
Technology: Subcritical steam turbines
Fuel: Bituminous coal from nearby collieries
Cooling: Dry-cooling technology
Main Protection Schemes:
o Generator Differential Protection
o Overcurrent and Earth Fault Protection
o Distance Protection on outgoing feeders
o Transformer Differential and REF Protection
o Generator Transformer Protection
1.2 Matla Power Station
Overview:
Located near Kriel, Matla Power Station is another large coal-fired station
commissioned in the late 1970s. Unlike Kriel, it uses a wet-cooling system and larger
generating units. Matla was built with an emphasis on operational efficiency and
upgraded over the years to support improved environmental standards.
Key Characteristics:
Installed Capacity: ± 3,600 MW
Varsity Cube 2025 +27 81 278 3372
