Substation Transformers: The Heart of the Substation
A substation transformer is a crucial component of a substation,
serving as its central core. Its primary function is to modify
the relationship between incoming and outgoing voltage and
current. This modification allows electricity to be efficiently
transmitted and distributed to consumers.
Substation Transformer Ratings
Substation transformers are rated based on their primary and
secondary voltage relationship and their power capacity. For
instance, a typical substation transformer might be rated as
69-13 kV and 20 MVA. This means that the transformer can handle
incoming high voltage at 69 kV and convert it to a lower voltage
of 13 kV for distribution, all while having a power capacity of
20 MVA or 20,000 KVA.
Maintain Reliable Transformer Operation
To maintain reliable operation, substation transformers consist
of a core and coils that are submerged in oil within a steel
tank. The oil serves two critical purposes: it acts as an
insulator, protecting the transformer, and functions as a
coolant to maintain the core at a suitable operating
Safety & Optimization
In some cases, larger transformers have additional cooling
mechanisms, such as fins that allow oil circulation to dissipate
heat more efficiently. Some may also include fans to force air
across the fins or pumps to actively circulate the oil for
better cooling performance. In certain situations, utilities may
even employ water spray systems to cool the transformer case
during hot days and high load conditions. These cooling measures
are necessary to ensure the transformer operates safely and
optimally, supporting the reliable supply of electricity to
New Substation Transformers are Expensive
The cost of a new substation transformer can vary widely
depending on several factors such as its voltage rating, power
capacity, type (e.g., distribution or power transformer),
manufacturer, and additional features or specifications required
for the specific application. The average cost for a new
substation transformer range from hundreds of thousands to
several million dollars.
The transformer is the heart of the substation. Take care of
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15 Activities to Extend the Life of Substation