Relative Keywords: 33kV cable testing, hi-pot test, insulation resistance test, partial discharge test, tan delta test, cable commissioning, post-installation testing.

Professional Answer: The reliability of a 33kV cable network depends heavily on comprehensive testing. Before installation, factory acceptance tests are performed to verify the cable's specifications. After installation, a series of pre-commissioning tests are conducted to ensure the cable system's integrity. Key tests include:

• Insulation Resistance Test: Measures the effectiveness of the insulation to prevent leakage current.

• High Potential (Hi-Pot) Test: A voltage withstand test to check the cable's ability to handle overvoltage conditions.

• Partial Discharge (PD) Test: Detects microscopic voids or defects in the insulation that could lead to premature failure.

• Tan Delta Measurement: Assesses the quality of the insulation material.

• DC Voltage Test of the Outer Sheath: Ensures the integrity of the protective sheath.