Safety instructions 13
Electrical safety in installation, start-up and maintenance
Precautions before electrical work
These instructions are for the qualified electricians who do work on the converter,
generator cable or generator.
WARNING! Perform the electrical safety precautions below before starting any
work on the installation. If you ignore the precautions, physical injury or death, or
damage to the equipment can occur. If you are not a qualified electrician, do not
proceed or do any installation or maintenance work.
1. Clearly identify the work location.
2. Disconnect all possible voltage sources.
• Open the main circuit breaker (Q1), disconnect, lock and attach a warning notice
to it. See section Opening and disconnecting the main circuit breaker on page 16.
• Open the charging circuit switch-disconnector (Q10). See section Disconnecting
the charging circuit from the main circuit on page 19.
• Open and lock out the auxiliary voltage switch-disconnectors (Q2 and Q3). See
section Disconnecting the external auxiliary power supply on page 20.
• Disconnect any external dangerous voltages from the control circuits (such as
relay outputs).
• Open, disconnect and lock out the breaker of the grid transformer as the main
circuit breaker of the converter does not remove the voltage from the grid cable
busbars and some auxiliary circuits. Attach a warning notice to the disconnector.
• Lock the turbine rotor (and generator shaft).
• Open the safety switch between the generator-side converter and the generator (if
any).
• After you disconnect the converter, always wait for five minutes to let the
intermediate circuit capacitors discharge before you continue.
3. Protect any other energized parts in the work location against contact.
4. Take special precautions when close to bare conductors.
5. Measure that the installation is de-energized.
• Use a multimeter with an impedance of at least 1 Mohm.
• Make sure that the voltage between the converter grid cable terminals (L1, L2, L3)
and the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the generator cable terminals (U2, V2, W2)
and the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the DC bus and the grounding (PE) busbar is
close to 0 V.
Note:
•
Only authorized persons are allowed to repair a malfunctioning converter.
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