DELL X1052 switches

DELL X1052 switches

Operating time characteristic checks It is recommended that the relays are timed at two points on the characteristic curve as given in the following relevant sections. (a) MVTD 11 undervoltage relay (See Figure 4 for the test circuit) One pole of the changeover switch (SW1) should be used to start the timer and one of the relay contacts used to stop the timer. Note: If the changeover switch or variable resistor (rheostat) is not available, it is permissible to test the relay at only one point on the characteristic curve ie. switching from 120% of the setting to zero.

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With the relay on the minimum voltage setting

 (32Vn = 57/70V or 62V for Vn = 100/120V) and the TMS = 1x, the variac and variable resistor should be adjusted to provide 120% and 70% of the setting voltage respectively. Using the changeover switch (SW1 in Figure 4), change the applied voltage to the relay from 120% to 70% of the voltage setting. Measure and record the operating time. The operating time should be 16.67s ±7.5% (within the range 15.42s to 17.92s). No allowance has been made for instrument errors. Adjust the variable resistor to give zero volts from the wiper connection (ie. take the wiper to the beginning of the track). Switch the voltage applied to the relay from 120% of the setting to zero and measure and record the operating time. The operating time should be 5s ±5% (within the range 4.75s to 5.25s). No allowance has been made for instrument errors.

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