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PREVIOUS | TABLE OF CONTENTS | NEXT 27. Testing & Inspection at Manufacturer's Plant27.1 Subject to subsection 27.2, tests for following electrical equipment shall be witnessed by a marine surveyor at the manufacturer's plant, except that a recognized Classification Society Certificate shall serve as test verification of such inspection for equipment manufactured outside of Canada;
27.3 Machines and equipment having a capacity less than that set forth in subsection (1), shall be tested by the manufacturer whose certificate of test shall be made available, if requested, to the marine surveyor. 27.4 In the case of propulsion machines operating at more than one voltage or one frequency, the predominant operating criteria shall be used as the basis for testing the machine. 28. Testing Rotating Machines ^ 28.1 The tests which shall be carried out on the rotating machines described in Section 27 are:
28.3 The insulation resistance test of generator and motor windings shall be carried out with the machine at operating temperature and should be not less than one megohm. 28.4 The high potential test of ac generators shall be performed by the continuous application of an ac potential of twice the rated voltage of the machine plus 1000 volts for one minute between all windings and ground and between phases except that this test does not apply to field windings; for high voltage machines designed to operate with the neutral insulated, the test voltage shall be not less than 7.5 times the line to neutral voltage. 28.5 The high potential test of field windings of ac generators shall be performed by the continuous application of an ac potential of ten times the excitation voltage, but in no case less than 1500 volts between field brush rigging and ground, and between field brush rigging of opposite polarity. 28.6 The high potential test of dc generators shall be performed by the continuous application of an ac potential of twice the rated voltage of the machine plus 1000 volts for one minute between:
28.8 The commutation test on dc motors shall consist of the application of a momentary torque of 50% in excess of that corresponding to its rating, for 15 seconds with fixed brush setting, without injurious sparking or injury to the commutator or brushes. 28.9 The commutation of ac commutator motors shall be practically sparkless over the specified range of load and speed. 28.10 The overload test for generators shall be performed as an excess current of 50 percent for 15 seconds after attaining the temperature rise corresponding to rated load, the terminal voltage being maintained as near the rated value as possible; the foregoing does not apply to the overload torque capacity of the prime-mover. 28.11 The overload test for motors shall be performed at rated speed or, in the case of a range of speeds, at the highest and lowest speeds, under gradual increase of torque, the appropriate excess torque given below; synchronous motors and synchronous induction motors are required to withstand the excess torque without falling out of synchronism and without adjustment of excitation circuit preset at the value corresponding to rated load:
28.12 Ships' service generators are to be capable of withstanding the mechanical and thermal effects of fault current for the duration of any time delay which may be fitted in a tripping device for discrimination purposes; they are to be capable of maintaining under steady-state short-circuit conditions a current of at least 3 times the full load for a duration of 2 seconds or, where precise data is available, for the duration of any time delay which may be fitted in a tripping device for discrimination purposes. 29. Testing Switchboards and Motor Control Centres ^ 29.1 The following tests shall be carried out on those main, emergency and propulsion switchboards and motor control centres required to be tested:
29.3 The high potential test for all switching and control apparatus for systems over 60 volts should be twice the rated volts plus 1000 volts for one minute. 29.4 The insulation resistance shall be not less than 1 megohm between:
30.1 All main cables for electric propelling machinery shall be tested in accordance with the following:
TABLE 30-1 Test Voltages for Propulsion cables
31.1 A high-potential test shall be carried out on every transformer described in Section 27 preferably with the transformer hot, immediately after the temperature rise test; the test shall be applied between the winding under test and the remaining windings, frame and tank of the transformer all connected to ground. 31.2 The test shall be made with ac at a convenient frequency between 25 Hz and twice the rated frequency and the full test voltage, as shown in Table below, and shall be maintained for one (1) minute without breakdown.
31.3 Induced potential: an ac potential of twice the maximum rated voltage of one winding at a suitable frequency shall be applied for a duration equal to 1 min. X (Twice rated Frequency) / (Test Frequency) with a minimum of 15 seconds between the terminals of that winding with the ends of the other windings open. 31.4 Temperature rise: rated voltage at rated frequency shall be applied to the primary windings of a transformer with rated load connected to the secondary windings; as an alternative, tests resulting in losses approximating those obtained under normal or specified load conditions may be applied; the test shall be continued until constant temperatures are attained; the temperature rises shall not exceed those given in Table 14-1. 31.5 Insulation resistance test of the transformer windings shall be carried out, preferably with the transformer winding hot, immediately after the temperature rise test and shall be not less than one megohm. 32. Testing Static Power Supplies ^ 32.1 A high-potential test shall be carried out on every static power supply described in section 27, preferably with the unit hot, immediately after the temperature rise test; the test shall be made with ac of suitable frequency and applied for a period of one minute, both between parts connected to different circuits (where applicable) and between live parts and exposed non-current-carrying metal parts as follows:
32.3 Overload test: The static power supply unit shall be tested to ensure that the internal protective devices integral with the unit will function and protect the unit in accordance with the manufacturer's damage curve. 32.4 If a cooling fan is provided, the fire hazard due to fan failure shall be investigated. 32.5 Insulation resistance test of the wiring of the static power supply shall be carried out, preferably with the unit hot, immediately after the temperature rise test and the resistance shall be not less than one megohm. |
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