Kewtech KT64, Инструкция по эксплуатации, Страница: 38 / 44

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2 . Press the 0 ° / 180 ° switch to change the phase and repeat step ( 1 ).
3 . Change the phase again and repeat step ( 1 ).
b) Auto Test
Measurements are automatically performed under the Auto Test function in
the following sequence: X
1 / 2 ( 0 ° ), X 1 / 2 ( 180 ° ), X 1 ( 0 ° ),X 1 ( 180 ° ), X 5 ( 0 ° ),
X 5 ( 180 ° ).
1 ) Press F 1 to select Auto
2 ) Press F 2 & F 3 to select I
Δ
n & RCD type
3 ) Press the Test button. The KT 64 will automatically conduct the sequence
as above. When the RCD trips each time reset it.
4 ) Return to the tester and the results will be displayed
▲
Be sure to return the tested RCD to the original condition after the test.
▲
When the Uc voltage rises to UL value or greater, the measurement is
automatically suspended and "Uc > UL" is displayed on the LCD.
▲
If " I
Δ
n" setting is greater than the rated residual current of the RCD, the
RCD will trip and "no" may be displayed on LCD.
▲
If a voltage exists between the protective conductor and earth, it may
influence the measurements.
▲
If a voltage exists between neutral and earth, it may influence the
measurements, therefore, the connection between neutral point of the
distribution system and earth should be checked before testing.
▲
If leakage currents flow in the circuit following the RCD, it may influence the
measurements.
▲
The potential fields of other earthing installations may influence the
measurement.
▲
Special conditions of RCDs of a particular design, for example S- type,
should be taken into consideration.
▲
The earth electrode resistance of a measuring circuit with a probe shall not
exceed table 1 (page 10 ).
▲
Equipment following the RCD, e.g. capacitors or rotating machinery, may
cause a significant lengthening of the measured trip time.
RCD