Transcript Fermilab - CERN Indico

Fermilab’s Experience in Applying OSHA and NFPA 70E
Requirements in Accelerator Power Supply Systems
Fermilab
AD E/E Support Department
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NFPA 70E Standard for Electrical Safety in the Workplace 2004 Edition.
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ADDP-EE-2004 Quality Control and Maintenance Considerations in
Equipment Design.
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Design recommendations used as a guide and review work sheet
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Safety-Related Work Practices.
Safety-Related Maintenance Requirements.
Safety Requirements for Special Equipment.
Installation Safety Requirements.
Requirement for internal design
Guide for procurement of commercial manufactured equipment
ADDP-EE-1002 PROJECT DOCUMENTATION
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Documentation for projects requirements and recommendations
June 15 2010
Steven Hays
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Flashing Lights to Indicate the Status of the Voltage
Fermilab
AD E/E Support Department
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In order to avoid having our Techs adding extra clothing to do
the verification we have started adding the flashing light to
equipment.
•These disconnects have the
flashing light that indicate that
indicate both the input and output
voltage state.
•For verification we can see the light
are on and when turned off we verify
by seeing the light go off.
•This prevents us from having to
open the door and have exposed
voltage.
June 15 2010
Steven Hays
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Example of High Impedance Test Points We have
Added to Existing Equipment to Make Verification Safer
Fermilab
AD E/E Support Department
This box has been
added to all of our
480vac powered
supplies.
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In this box is a set of
texts points with series
resistors.
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A meter can be
connected to the test
points.
•With the meter connected the Techs can got to the power panel and
turn off the breaker and see that the voltage went off.
•This can be done with only minimal clothing requirements. (Long Sleeves
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and Long Pants)
June 15 2010
Steven Hays
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We wish to reduce the chance of exposure to our
Techs so we added these test points.
Fermilab
AD E/E Support Department
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With the doors closed the
exposure is class “0”.
With the doors open the
exposure is class “1”.
Class “0” requires Long
sleeves and pant with
safety glasses.
Class “1” requires the class “0” clothing with the addition of leather
gloves and shoes to verify that the 480vac goes off.
These test points reduces the exposure of our Techs to the live
bus/cable behind the door. And allows them to verify that the
voltage is off.
June 15 2010
Steven Hays
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Example of the Viewing Windows Installed in
Disconnects to allow for Verification.
Fermilab
AD E/E Support Department
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This disconnect is used to
lockout a transformer and
208/120 Vac Power Panel.
When locked out a lock that is
defined as a group lock is added
and the key is returned to the
control room (MCR) and placed
in a lock box that is just for MI
LOTO, so that others can lock
over.
This requires minimal clothing.
Provides LOTO for access to the
enclosure but not for the Techs
working on the actual equipment
June 15 2010
Steven Hays
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Example of a disconnect with an added lock out key
switch and window for inspection of blades.
Fermilab
AD E/E Support Department
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This disconnect is used to lock
out an individual supply.
There is a key that will lock the
handle down. This key is used
to unlock the PS doors and
sequence the switching and
grounding of a large cap bank.
June 15 2010
Steven Hays
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Example of Motor Driven Disconnect used on 13.8kvac
Systems
Fermilab
AD E/E Support Department
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There are times that non-electrical
personnel need to provide LOTO for
others accessing the enclosures. In
general they are not trained or
equipped with same tools as our
techs.
When Accessing our NuMI
enclosure the operations crew will
look through the window to verify
that all three blades are open.
They are responsible for the LOTO
for people to access so people will
then be able to lock over there
locks when they get there access
keys from the control room.
June 15 2010
Steven Hays
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Example of a Main Injector Dipole Power Supply
Fermilab
AD E/E Support Department
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This is an example of our MI 10
Mva power supplies.
All of this equipment is
maintained by the E/E Support
Department.
Lockout of an individual supply is
done only by E/E Techs and
requires full clothing to be worn.
The lockout of the entire ring is
performed by the operations
crew with assistance from the
duty electricians assisted by
remote controlled VCBs and nonload break disconnects
June 15 2010
Steven Hays
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Vacuum Circuit Breaker and Disconnect used on
our Large Power Supplies in the MI
Fermilab
AD E/E Support Department
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The left compartment is a 600
amp load break switch
The right compartment is has a
PT drawer and VCB installed.
June 15 2010
Steven Hays
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After 40 years of our Techs switching this type of
equipment is the clothing necessary
Fermilab
AD E/E Support Department
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The answer is YES
June 15 2010
Steven Hays
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Quality Control and Maintenance Considerations in
Equipment
Fermilab
AD E/E Support Department
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This document was created as a result of our experience in support of
operation of our accelerator complex.
We use this document as a guide for constructing new systems as well as
a tool for evaluation of designs.
Things that this document address:
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Minimize Heat and Mechanical Vibration
Design for Air-cooling Where Feasible /Use Care in Water-Cooling Equipment
Design for a Transient Recorder / Filter and Latch all signals
Do not use panel meters for trips
Standardize Designs When possible
Avoid Electrical Noise and contact Problems
Be Wary of the External Control System
Avoid High-impedance Analog Circuits / High Humidity can effect
Use Smoke Detectors
Testing of Vendor Procured Parts
June 15 2010
Steven Hays
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Project Documentation
Fermilab
AD E/E Support Department
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This is a document used as a guideline for executing and
documenting projects in the E/E Support Department.
We require a Notebook:
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Specifications and changes to the specification
Design review information both internal and overall project reviews
Log book is always a good idea especially during testing and startup
Records of communication with vendors
Environment Safety & Health
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Testing
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Safety Analysis Report
Internal Safety Design Review
Pre-power Check List Written if on large systems and high power devices
Written procedures for testing an alignment of sub systems.
Final Project Report
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Block diagrams and written explanations
Written description on how the project interfaces to the Accelerator Controls System
June 15 2010
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