Introduction; Test Equipment; Inspection; Precautions - Siemens 7sg15 microtapp Operation Manual

1 Introduction

Extensive accuracy, functional, and endurance testing is carried out at the factory prior to despatch. On-site
confirmation of the setting ranges and accuracy levels are not necessary. However, in order to confirm correct
operation of the overall voltage control scheme, it is suggested that the following minimum tests be carried out.

2 Test Equipment

It is assumed that CT injection testing has been carried out to confirm the VT and CT rating and ratio. Instruments
required are: -
•
A 500V Insulation resistance test set
•
A variable voltage source
•
A high quality RMS sensing digital voltmeter
•
Timing stopwatch
For testing the communications channels: -
•
Portable PC with fibre optic modem connections and 25-way serial cable

3 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 the relay is fully inserted into the case. Refer to the Description of
Operation for programming the relay.

4 Precautions

Before testing commences the equipment should be isolated from the current transformers and the CTs short
circuited in line with the local site procedures. The inputs and alarm circuits should also be isolated where
practical.
Ensure that the correct auxiliary voltage is applied to the circuit. See the relevant scheme diagrams for the relay
connections.

5 LCD Contrast Adjustment

The LCD contrast will vary with temperature and the level may need to be adjusted. The contrast should be
adjusted after the relay has been powered up for at least half an hour to let the temperature settle.
The procedure for adjusting the contrast is given in the installation section of this manual.

6 Tests

This document details the key testing that should be carried out. Other confirmation tests should be undertaken
prior to service, depending on any additional functions incorporated into the design.
©2012 Siemens Protection Devices Limited
7SG15 MicroTAPP Commissioning
Chapter 7 Page 3 of 10