Operation Guide P341/EN O/B11
Commissioning and CHAPTER 3
Maintenance Page 5/80
MiCOM P341
1. INTRODUCTION
The MiCOM P341 Interconnection Protection Relays are fully numerical in their
design, implementing all protection and non-protection functions in software. The
relays employ a high degree of self-checking and, in the unlikely event of a failure,
will give an alarm. As a result of this, the commissioning tests do not need to be as
extensive as with non-numeric electronic or electro-mechanical relays.
To commission numeric relays, it is only necessary to verify that the hardware is
functioning correctly and the application-specific software settings have been applied
to the relay. It is considered unnecessary to test every function of the relay if the
settings have been verified by one of the following methods:
• Extracting the settings applied to the relay using appropriate setting software
(Preferred method)
• Via the operator interface.
To confirm that the product is operating correctly once the application-specific
settings have been applied, a test should be performed on a single protection
element.
Unless previously agreed to the contrary, the customer will be responsible for
determining the application-specific settings to be applied to the relay and for testing
of any scheme logic applied by external wiring and/or configuration of the relay’s
internal programmable scheme logic.
Blank commissioning test and setting records are provided at the end of this chapter
for completion as required.
As the relay’s menu language is user-selectable, it is acceptable for the
Commissioning Engineer to change it to allow accurate testing as long as the menu is
restored to the customer’s preferred language on completion.
To simplify the specifying of menu cell locations in these Commissioning Instructions,
they will be given in the form [courier reference: COLUMN HEADING, Cell Text]. For
example, the cell for selecting the menu language (first cell under the column
heading) is located in the System Data column (column 00) so it would be given as
[0001: SYSTEM DATA, Language].
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE USER
SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY AND
TECHNICAL DATA SECTIONS AND THE RATINGS ON THE EQUIPMENT’S
RATING LABEL.
2. SETTING FAMILIARISATION
When commissioning a MiCOM P341 relay for the first time, sufficient time should be
allowed to become familiar with the method by which the settings are applied.
Chapter 1 contains a detailed description of the menu structure of P341 relays.
With the secondary front cover in place all keys except the [Enter] key are accessible.
All menu cells can be read. LEDs and alarms can be reset. However, no protection
or configuration settings can be changed, or fault and event records cleared.
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