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7
Service Preparation
7.1 Low Voltage and High Voltage Electrical Connections
The cables that are connected to the transformer bushings should be long enough to allow
their expansion and contraction due to temperature changes.
It is important to verify that the connections are very tight to avoid hot spots generation, or
the transformer terminals are disconnected due to pad-mounted transformer characteristic
vibrations. On the other hand, it must be assured that the weight and alignment of the
cables connected to the bushing will not bring about mechanical stress that can cause crack,
failures or to provoke the presence of leakages through the gaskets.
7.2 Connections
The connections that are not shown in the nameplate must not be realized.
7.3 Ground Connections
The transformer must be permanently ground connected in order to avoid electrical
discharge by an induced voltage. The connection has to be made through the tank ground
pad. For the containerized solution Sungrow supply, the transformer has been grounded via
the container grounding cables. Please make sure the container grounding pad are well
connected to the grounding network onsite.
The ground system must be carried out with the particular regulations of the area where the
transformer has been installed.
Never make connections that are not authorized by the manufacturer or are not
indicated in the Nameplate.
7.4 Pre-Commissioning Check
Before applying voltage to the transformer check the following:
• The neutral terminals on HV side (Yny type transformers) are properly ground connected.
Except: the Dy1 or Dy11 transformer does not have the neutral terminals on HV side.
• The tank is solidly grounded.
• The tap changer has the adequate position to provide the relation of needed voltage
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