Cables and cable accessories are tested in multiple international standard tests.

Standard Requirements And Test Items
Test items and standard requirements	Compound Sleeve Terminations	Premould Termination	GIS Termination	Straight Joint/Insulation Joint
1min power frequency voltage test (wet state) : 185kV, 1min no breakdown and flashover	√	√
Partial discharge test at room temperature: the power under 96kV is not more than 5pC	√	√	√	√
Constant voltage load thermal cycle test: the conductor is heated to 95°C~100°C, the applied voltage is 128kV, each cycle is 24h, including heating 8h cooling 16h, a total of 20 cycles.	√	√	√	√
High temperature partial discharge test: the lower power of 96kV is not more than 5pC	√	√	√	√
Lightning impact voltage test: 95°C ~ 100°C, 550kV positive and negative polarity 10 times, no flashover, no breakdown	√	√	√	√
15min power frequency voltage test after impulse voltage test: 160kV. 15min no flashover, no breakdown	√	√	√	√
4h power frequency voltage test: 192kV no flashover, no breakdown	√	√	√	√
Impact voltage margin test: Through the 550kV impact test with 50kV as a level of margin test	√
Dc voltage test: Apply a DC voltage of 20kV for 1min between the cable metal sheath at both ends of the connector isolation insulator and the metal sheath at each end and the grounding surface of the connector outer protective layer. No breakdown should be achieved.				√
Impulse voltage test: Apply 75kV impulse voltage between the metal sheaths at both ends of the joint, and apply 37.5kV impulse voltage between the metal sheaths at each end of the cable and the grounding surface of the outer sheaths, and no breakdown should be achieved.				√
Technical specification
Nominal voltage	64/110KV
Maximum voltage	126KV
leakage distance（mm ）	≥3906
Leakage distance per unit withstand voltage（mm/kV ）	≥31

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