Completing The Test - ABB ret650 Commissioning Manual

Transformer protection

Hide thumbs Also See for ret650:

Technical manual (670 pages)

Applications manual (392 pages)

Commissioning manual (112 pages)

Table Of Contents

100

101

102

103

104

105

106

107

108

109

110

Table of Contents

1MRK 504 126-UEN -

6.3.3.2

Commissioning Manual

As the operating voltage is adjusted on the stabilizing resistor

and with the setting of the resistor value in the function this is

essential for the measurement of the expected value. Normally

a slightly higher operating value is no problem as the

sensitivity is not influenced much.

Connect the trip contact to the test set to stop the test set for measurement of

trip times below.

Increase the voltage and make note of the operate value U>Trip. This is done

with manual test and without trip of the test set.

Reduce the voltage slowly and make note of the reset value. The reset value

must be high for this function.

Check the operating time by injecting a voltage corresponding to 1.2 ·

U>Trip level. Make note of the measured trip time.

If required, verify the trip time at another voltage. Normally 2 · U>Trip is

selected.

If used, measure the alarm level operating value. Increase the voltage and

make note of the operate value U>Alarm. This is done with manual test and

without trip of the test set.

Measure the operating time on the alarm output by connecting the stop of the

test set to an output from tAlarm. Inject a voltage 1.2 · U>Alarm and measure

the alarm time.

Check that trip and alarm outputs operate accordingly to the configuration logic.

10. Finally check that start and alarm information is stored in the event menu and

if a serial connection to the SA is available verify that the correct and only the

required signals are presented on the local HMI and on the SCADA system.

Information on how to use the event menu is found in the operator's

manual.