Repair Instruction - ABB Relion 670 Series Commissioning Manual
Busbar protection
Hide thumbs
Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
Table of Contents
Advertisement
1MRK 505 304-UUS -
13.3
Busbar protection REB670 2.0 ANSI
Commissioning Manual
•
Module that should be changed.
•
Sequence of faults, if more than one unit is faulty.
•
Exact time when the fault occurred.
Repair instruction
Never disconnect the secondary connection of a current transformer
circuit without short-circuiting the transformer's secondary winding.
Operating a current transformer with the secondary winding open will
cause a massive potential build up that may damage the transformer
and may cause injuries to humans.
Never connect or disconnect a wire and/or a connector to or from a IED
during normal service. Hazardous voltages and currents are present that
may be lethal. Operation may be disrupted and IED and measuring
circuitry may be damaged.
An alternative is to open the IED and send only the faulty circuit board to ABB for
repair. When a printed circuit board is sent to ABB, it must always be placed in a
metallic, ESD-proof, protection bag. The user can also purchase separate replacement
modules.
Strictly follow the company and country safety regulations.
Most electronic components are sensitive to electrostatic discharge and latent damage
may occur. Please observe usual procedures for handling electronics and also use an
ESD wrist strap. A semi-conducting layer must be placed on the workbench and
connected to ground.
Disassemble and reassemble the IED accordingly:
1.
Switch off the dc supply.
2.
Short-circuit the current transformers and disconnect all current and voltage
connections from the IED.
3.
Disconnect all signal wires by removing the female connectors.
4.
Disconnect the optical fibers.
5.
Unscrew the main back plate of the IED.
6.
If the transformer module is to be changed:
Section 13
Troubleshooting
167
Advertisement
Table of Contents
