METHOD OF AND APPARATUS FOR INCOPLETE TESTING THE PROTECTION OF 110 KV FEEDER TRANSFORMER PRIMARY WITHOUT MAKING SUCH TRANSFORMER INOPERATIVE

摘要

1. A method of performing partial testing of the safety systems on the higher voltage side of a power supply transformer, involving the activation of the tested safety systems by stepwise feeding of supply values from current feeders to the tested safety system in the course of functional tests on that system, and the breaking of the cut-out pulse circuits during the test, after which the device and safety system return automatically to their original state, characterized in that during testing of a differential safety device (2) this device receives, via the final control element (20), a 50 Hz first harmonic current of the set value, from current feeders (8 and 10), and a measurement is made of the stabilization characteristic, and then a check on the blocking of the action of the differential safety device (2) is carried out by supplying it with a specified value of 100 Hz second harmonic current from sources (9 and 11) of second harmonic current, also via the final control element (20).2. Testing device for performing partial testing of the safety systems on the higher voltage side of a power supply transformer, containing a selector switch, which together with a control component is connected to the final control element, to which is also connected a current feeder, connected to an external AC power source, together with a selector switch for the supply value, and additionally the control component is connected to a start button and a stop button, as well as an element which breaks the circuit of the trigger coil, an optical signalling component and a time measuring component [...]IMAGE