Common use of Type Tests Clause in Contracts

Type Tests. In accordance with the requirements of IEC 60137 plus:- (a) Puncture Withstand Test - The bushing, immersed in the medium, or media as intended for service shall have a voltage of approximately one third of the test voltage applied to it. The voltage shall be increased to the test voltage as rapidly as is consistent with its value being indicated by the measuring means, provided that the time taken to increase the voltage to the final value is not less than 10 seconds. The final test voltage, which shall be 15% greater than the specified Power Frequency Withstand Voltage shall be sustained only for the time necessary to determine it. Puncture or flashover shall not occur during the test. Bushing which have been subjected to this test shall not thereafter be used in the contract works without special approval. (b) Alternatively, on bushings intended for use with impulse tested apparatus, the test shall be performed by subjecting the bushing under the above conditions to five consecutive impulse voltage waves. The impulse waves shall be of the most onerous polarity and of a value 15% in excess of that specified as the Rated Insulation Level. During this test puncture of the bushing or flashover of insulation immersed in oil or gas shall not occur, but flashover of air ends is permissible.

Type Tests. In accordance with the requirements of IEC 60137 plus:- (a) Puncture Withstand Test - The bushing, immersed in the medium, or media as intended for service shall have a voltage of approximately one third of the test voltage applied to it. The voltage shall be increased to the test voltage as rapidly as is consistent with its value being indicated by the measuring means, provided that the time taken to increase the voltage to the final value is not less than 10 seconds. The final test voltage, which shall be 15% greater than the specified Power Frequency Withstand Voltage shall be sustained only for the time necessary to determine it. Puncture or flashover shall not occur during the test. Bushing which have been subjected to this test shall not thereafter be used in the contract works without special approval. (b) . Alternatively, on bushings intended for use with impulse tested apparatus, the test shall be performed by subjecting the bushing under the above conditions to five consecutive impulse voltage waves. The impulse waves shall be of the most onerous polarity and of a value 15% in excess of that specified as the Rated Insulation Level. During this test puncture of the bushing or flashover of insulation immersed in oil or gas shall not occur, but flashover of air ends is permissible.