Commissioning; Required Test Equipment; Inspection; Applying Settings - Siemens 7SG164 Ohmega 400 Series Manual

7SG164 Ohmega 400 Series Commissioning

1 Commissioning

A separate commissioning guide is available for each model of the relay which details the testing of each
function.

1.1 Required Test Equipment

1000V Insulation resistance test set.
Digitally controlled automatic test equipment suitable for distance relay testing (3 phase o/ps)
Primary injection equipment 5KVA with variable 500A output
Phase sequence meter
A d.c. supply with nominal voltage within the working range of the relays d.c. auxiliary supply rating.
A d.c. supply with nominal voltage within the working range of the relays d.c. input rating.
Additional equipment for testing the communications channel:
Portable PC with fibre optic modem, or RS232 connections.

2 Inspection

Ensure that all connections are tight and in accordance with the relay wiring diagram and the scheme diagram.
Check the relay is correctly programmed and fully inserted into the case. Refer to the Description of Operation
for programming the relay.

3 Applying Settings

The relay settings for the particular application should be applied before any secondary testing occurs. If they
are not available then the relay has default settings which can be used for pre-commissioning tests. Note the
input and output relays must be programmed correctly before any scheme tests are carried out. See the Relay
Settings section of this manual for the default settings.
The relay feature eight alternative settings groups. In applications where more than one settings group is to be
used then it may be necessary to test the relay in more than one configuration.
When using settings groups it is important to remember that the relay need not necessarily be operating
according to the settings which are currently being displayed. There is an "active settings group" on which the
relay operates and an "edit/view settings group" which is visible on the display and which can be altered. This
allows the settings in one group to be altered while the protection continues to operate on a different unaffected
group. This "active settings group" and the "edit settings group" are selected in the "System Configuration
Menu".
Elsewhere in the settings menu system, those settings which can be altered for different groups are indicated by
the symbols G1, G2 etc in the top left of the display. Other settings are common to all groups.

4 Precautions

Before testing commences the equipment should be isolated from the current and voltage transformers and the
CT's short circuited in line with the local site procedures. The tripping and alarm circuits should also be isolated
where practical. Ensure that the correct d.c. supply voltage and polarity is applied. See the relevant scheme
diagrams for the relay connections.

5 Tests

5.1 Insulation

Connect together all of the C.T. terminals and measure the insulation resistance between these terminals and all
of the other relay terminals connected together and to earth.
©2011 Siemens Protection Devices Limited Chapter 9 Page 3 of 6