Manual for D21 underexcitation protection needed
Manual for D21 underexcitation protection needed
(OP)
I have to perform maintenance test of old electromechanical relay protection type D21, manufactured by former Chech company ZPA. This company still exists, but their relay protection division is sold, so they didn't respond to my question.
If somebody can help me with some materials, like service manual or commissioning instructions it will be very helpful for me.
I have results from previous tests, so I can just compare my results with old ones, but I don't like to work without good understanding how to interpret measured data.
If somebody can help me with some materials, like service manual or commissioning instructions it will be very helpful for me.
I have results from previous tests, so I can just compare my results with old ones, but I don't like to work without good understanding how to interpret measured data.
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant





