Wind Turbine Safety Flashcards
1) Never go into the hub of a turbine without locking the …
2) What must you ensure prior to ending work on the hub/rotor?
1) Rotor Lock
The rotor lock is one of the most important safety equipment because when it is manually engaged it prevents the hub from rotating while a technician is inside or on the outside.
The rotor lock must be engaged prior to entering the hub. Rotor lock may not be disengaged before all personnel are out of the
hub.
2) Unsecured objects can cause damage to the turbine when the hub rotates. Do not leave any tools or other objects in the hub.
In the down tower assembly control center, what switch and setting do you need to be in to safely enter the nacelle?
The Operate Key, needs to be turned to either
Service (general maintenance) or
Repair (broken).
“Since the WTGS can be started by the remote control system, the WTGS [Wind Turbine Generator System] must be shut down for maintenance work. The service switch on the control cabinet must also be placed in the “Maintenance” or “Repair” position. The service switch must be replaced in the “Automatic” position after maintenance or repair work has been completed.
What is arguably the most dangerous part in the nacelle?
The high speed shaft. Always assume it is rotating and thus dangerous.
1) That is H.E.C. and why is it imporrant?
2) What is the OSHA standards code?
Hazardous Energy Control
or
Control of Hazardous Energy
“OSHA’s standard for The Control of Hazardous Energy (Lockout and Tagout), 1910.147, requires that hazardous energy be controlled [locked] during service and maintenance activities.”
“Equipment must be isolated from its energy source and rendered inoperative to prevent injury or death from unanticipated, uncontrolled hazardous energy.”
What does “protect with clearance” mean?
Clear the energy away from you.
National Electric Code (NEC)
NEC 110.26.
This set of code identifies how much clearance is needed around any type of electrical panel based on a number of different factors.
One of the main things that the NEC 110.26 specifies is that all electrical panels must have enough room around them that someone working on the equipment will have the room to safely access everything they need. This is necessary for all types of work including examination of the electrical panel, making adjustments to the electrical panel, servicing the electrical panel, and of course, performing maintenance on the electrical panel.
What is the OSHA Power Generation Standard number/
1910.269
More info here:
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.269
What are the 2 parts of Hazardous Energy Control?
Documentation
&
Safety Actions
How are these terms different: Hazard, Risk, Procedure, Regulation?
Hazard: The thing that can hurt you. Ex: High voltage, rotating mech, hydrolic pressure, dropped equiptment, falls
Risk: The probability that the thing will hurt you.
Procedure: A documented method of doing a job or a step by step narrative. Procedure helps eliminate complacency and help new or unexperienced workers. Can reduce high hazards to near zero risk.
Regulation: Are the law that inforce the standards
What are the 6 rules for electrical component work?
Electric Power Rules when carrying out any work on the electrical components:
- Disconnection of power
- Secure against re-connection of power
- Ascertain safe isolation from supply
- Grounding and short-circuiting
- Lock-out/Tag-out instructions
- Ensure that all drives are at a standstill
What must happen prior to working on / entering the Power Distribution Cabinet (PDC)?
Entrance to the PDC service entry cabinet requires the
- Pad Mount Transformer (PMT) to be de-energized
- PMT is grounded
- Locked out
This area cannot be accessed with the PMT energized and the PDC covers less than full strength due to arc blast and voltage hazards.
When working with a hydraulic system what is the main way to avoid a crush injury?
De-energize hydraulic unit. The electric motor must be switched off.
What is the maximum load rating of the tower hoist?
The LRSC Turbine has a
1/4 ton
250 kg
500 pounds
What is a safety chain?
“The safety chain is a series connection of contact points of various monitoring devices of the Wind Turbine Generator System. It serves to protect the WTGS from impermissible or dangerous operating states. The opening of just one of these contacts causes the interruption of the safety chain. In this case, an emergency braking operation that brings the rotor to a standstill as quickly as possible takes place. At the same time, the rotor blades are turned to the stop position of 89° (feathering position), the disk brake is activated and the WTGS is disconnected from the grid by the opening of the circuit breaker of the generator.”
What is the purpose of a WTG FAA (obstruction) light?
To keep airplanes that are flying too low from hitting the turbine.
Which is a more dangerous situation, closing or opening a high voltage circuit? Why?
“Closing a switch on voltage” is more dangerous
Closing a fuse switch is the dangerous part because that is when an arc
flash can happen; not when opening.”
