| 摘要 |
PURPOSE:To accurately measure and to reduce an operator's load by varying the reference value of an operating time in response to a deviation between a testing current and a settling current. CONSTITUTION:A testing current varying in proportion to a control signal from a controller 11 is supplied from a current generator 12 to a protective relay 17 to be tested, and its current is detected by a current detector 18. The controller 11 so controls the generator 12 as to bring the detection current into coincidence with a settling current, sets an operating time reference value from the application of the testing current to the relay to be tested to the reception of an operation signal of an inner protective contact 19 in response to the amplitude of the detection current, and tests the relay 11 to be tested by the difference between the actual operating time and the value. The calculations are conducted by a personal computer 21. |
