861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
105/214
Installation
23
Performing the power- frequency voltage test
If required, a test with rated short-duration power-frequency withstand voltage can be
performed at the readily installed switchgear on site. The busbar voltage transformers are
designed for a repeat test at 80% U
D
at 60 Hz according to IEC 62271-200.
Preparing the power-
frequency voltage test
➭ Check the SF
6
gas filling (see page 60, "Checking the SF
6
gas pressure").
➭ Before the test, remove non-disconnectable voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200.
➭ Close the transformer bushings in a surge-proof way.
➭ Switch the voltage transformer disconnector of the disconnectable voltage transformers to
OPEN position.
➭ For the rated short-duration power-frequency withstand voltage test, first close the three-
position disconnector and then the circuit-breaker in the incoming panel.
➭ Close all free sockets in the test section in a surge-proof way.
➭ Earth and short-circuit all test sockets of the voltage detecting system.
➭ Switch all other three-position disconnectors to READY-TO-EARTH position.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable connection
bushing via test adapters.
✔ The rated short-duration power-frequency withstand voltage test can now be performed.
Performing the power-
frequency voltage test
➭ Apply 80 % of the rated short-duration power-frequency withstand voltage consecutively to
phases L1, L2 and L3 for 60 seconds each.
WARNING
Hazardous electrical voltage!
An incorrectly performed high-voltage test can cause death, serious injury and property
damage.
➭ Observe the specifications for prevention of accidents.
➭ Observe the operating instructions and work instructions of the switchgear operator.
➭ Have the high-voltage test only performed by operating personnel who was instructed in
theory and practice of switchgear operation (see page 10, "Qualified personnel").
➭ Keep a minimum safety distance of 3 m during the test.
➭ Install safety barriers.
➭ Earth test leads when test is complete.
NOTICE
Considerable property damage
During the high-voltage test, connected non-disconnectable inductive voltage
transformers may be damaged.
➭ During commissioning, perform the high-voltage test before installing the non-
disconnectable voltage transformers.
➭ Remove already mounted non-disconnectable inductive voltage transformers.
➭ Close the transformer bushings in a surge-proof way.
➭ Check the SF6 gas filling (see page 60, "Checking the SF
6
gas pressure").
➭ Switch the disconnecting facility for panels with disconnectable voltage transformers to
OPEN position before performing the high-voltage test.