MFAC Service Manual

of 30
15 views
PDF
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Document Description
Type MFAC High Impedance Differential Relays Service Manual R8007F HANDLING OF ELECTRONIC EQUIPMENT A person’s normal movements can easily generate electrostatic potentials of several thousand volts. Discharge of these voltages into semiconductor devices when handling circuits can cause serious damage, which often may not be immediately apparent but the reliability of the circuit will have been reduced. The electronic circuits of AREVA T&D products are immune to the relevant levels of electr
Document Share
Document Tags
Document Transcript
    Type MFAC High ImpedanceDifferential Relays Service Manual R8007F    HANDLING OF ELECTRONIC EQUIPMENT  A person’s normal movements can easily generate electrostatic potentials of severalthousand volts. Discharge of these voltages into semiconductor devices whenhandling circuits can cause serious damage, which often may not be immediately apparent but the reliability of the circuit will have been reduced.The electronic circuits of AREVA T&D products are immune to the relevant levels of electrostatic discharge when housed in their cases. Do not expose them to the risk of damage by withdrawing modules unnecessarily.Each module incorporates the highest practicable protection for its semiconductordevices. However, if it becomes necessary to withdraw a module, the followingprecautions should be taken to preserve the high reliability and long life for which theequipment has been designed and manufactured.1. Before removing a module, ensure that you are a same electrostatic potentialas the equipment by touching the case.2. Handle the module by its front-plate, frame, or edges of the printed circuitboard. Avoid touching the electronic components, printed circuit track orconnectors.3. Do not pass the module to any person without first ensuring that you are bothat the same electrostatic potential. Shaking hands achieves equipotential.4. Place the module on an antistatic surface, or on a conducting surface which isat the same potential as yourself.5. Store or transport the module in a conductive bag.More information on safe working procedures for all electronic equipment can befound in BS5783 and IEC 60147-0F.If you are making measurements on the internal electronic circuitry of an equipmentin service, it is preferable that you are earthed to the case with a conductive wriststrap. Wrist straps should have a resistance to ground between 500k – 10M ohms. If awrist strap is not available you should maintain regular contact with the case toprevent the build up of static. Instrumentation which may be used for makingmeasurements should be earthed to the case whenever possible. AREVA T&D strongly recommends that detailed investigations on the electroniccircuitry, or modification work, should be carried out in a Special Handling Area suchas described in BS5783 or IEC 60147-0F.  4 TYPES:MFAC 14MFAC 34CONTENTS SAFETY SECTION51.INSTALLATION91.1General91.2Unpacking91.3Storage91.4Site92.COMMISSIONING102.1Description of relay, calculation of setting and commissioning preliminaries102.2Instructions to ensure that the relay can be commissioned at the specific settingsfor the application123.MAINTENANCE184.MECHANICAL SETTINGS184.1General184.2Contact settings184.3Mechanical flag settings185.PROBLEM ANALYSIS195.1Failure to operate195.2Output contacts not changing state196.SPARES207.COMMISSIONING TEST RECORD21REPAIR FORM23
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks
SAVE OUR EARTH

We need your sign to support Project to invent "SMART AND CONTROLLABLE REFLECTIVE BALLOONS" to cover the Sun and Save Our Earth.

More details...

Sign Now!

We are very appreciated for your Prompt Action!

x