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Section 13
Troubleshooting
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:
•
•
•
•
7.
Pull out the faulty module.
8.
Check that the new module has a correct identity number.
9.
Check that the springs on the card rail are connected to the corresponding metallic area on the
circuit board when the new module is inserted.
10. Reassemble the IED.
If the IED has been calibrated with the system inputs, the calibration procedure must be performed again
to maintain the total system accuracy.
13.4
Repair support
If an IED needs to be repaired, the whole IED must be removed and sent to an Hitachi Power grids
Logistic Center. Please contact the local Hitachi Power grids representative to get more details.
13.5
Maintenance
The IED is self-supervised. No special maintenance is required.
Instructions from the power network company and other maintenance directives valid for maintenance of
the power system must be followed.
168
Strictly follow the company and country safety regulations.
Remove the IED from the panel if necessary.
Remove the rear plate of the IED.
Remove the front plate.
Remove the screws of the transformer input module, both front and rear.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 511 409-UUS Rev. K
Phasor measurement unit RES670
Commissioning manual
M11766-4 v3
M11768-3 v4
M11769-3 v2
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