SLOW OPERATION FOR MAINTENANCE PURPOSES
REV6 /REV3 OI 248 (EN) 127
140
A6 Slow Operation for Maintenance Purposes
Introduction
These instructions describe the following manual operations:
• Executing a slow closing operation
• Executing a slow opening operation
Manual operations in accordance with these instructions are not
necessary during installation work and during normal breaker ope-
ration.
Slow closing or opening operations can be used for setting, adjus-
ting and checking the circuit breaker, if necessary.
After improper manipulations or when there are problems with the
breaker, it may be necessary to close or open the breaker slowly
and discharge the closing spring manually in order to eliminate a
problem or fault.
Safety Precautions
Stored-energy spring mechanisms have been designed according
to the state of the art and are safe and reliable. Nonetheless, these
devices can be hazardous if operated improperly.
The circuit breaker operator must therefore ensure that all person-
nel working on the equipment will meet the following requirements:
• Technical knowledge regarding local and national safety and
accident prevention regulations, especially for high voltage
systems and devices
• Knowledge of and compliance with the contents of this document
• Professional training in the area of circuit breakers and stored-
energy spring mechanisms
• Compliance with the safety instructions displayed on the device
• Agreement to report immediately any changes that may
compromise safety
Requirements for Executing Manual Operations
• The circuit breaker is in the open position.
• The circuit breaker is grounded (earthed) at both ends.
• The control voltage is turned off.
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