DESIGNATION: 50/51N
Remove packing & Transportation protection like stoppers / Support / rubber bands.
Pick up test :
Set TMS to 0.1 and plug setting to the desired value. Inject the current above than the plug setting value and note down the disc starting & closing currents. Starting current should be in the range of 102 % -105 % and closing current should be in the range of 105% to 120%.
If any error this should be adjusted with the spring provided at bottom of the relay disc the relay.
The same procedure is followed for earth fault pick up test also.
PHASE OVER CURRENT TIMING TEST:
With desired current plug setting TMS 0.1 the tripping time should be Measured for 2 Is value and 5 Is value. For normal inverse curve 2 times of fault current the tripping time should be 10 seconds at TMS 1.0 For 5 times of fault current the tripping time should be 4.4 seconds at TMS 1.0.
INSTATANEOUS ELEMENT CHECKING:
Set the desired instantaneous value. Inject the current and measure the pick up value of instantaneous element. Apply 2 times of pick up value and note done the reading. This should be in the range of 50 milli-seconds.
Remove packing & Transportation protection like stoppers / Support / rubber bands.
Pick up test :
Set TMS to 0.1 and plug setting to the desired value. Inject the current above than the plug setting value and note down the disc starting & closing currents. Starting current should be in the range of 102 % -105 % and closing current should be in the range of 105% to 120%.
If any error this should be adjusted with the spring provided at bottom of the relay disc the relay.
The same procedure is followed for earth fault pick up test also.
PHASE OVER CURRENT TIMING TEST:
With desired current plug setting TMS 0.1 the tripping time should be Measured for 2 Is value and 5 Is value. For normal inverse curve 2 times of fault current the tripping time should be 10 seconds at TMS 1.0 For 5 times of fault current the tripping time should be 4.4 seconds at TMS 1.0.
INSTATANEOUS ELEMENT CHECKING:
Set the desired instantaneous value. Inject the current and measure the pick up value of instantaneous element. Apply 2 times of pick up value and note done the reading. This should be in the range of 50 milli-seconds.
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