Generally Inverse time overcurrent relays with Definite Minimum Time feature (IDMT. relays) are used in practice. There are many types of such relays available in relay-. market, viz. normal inverse relays, very inverse relays and extremely inverse relays. The. characteristics of these relays are shown in fig. 1.2. The other types of o/c relays are 3. second relay and 1.3 second relay. This means the time of operation of the relay is either. 3 or 1.3 second at Plug Setting Multiplier (PSM) equal to 10. Long time inverse relays. are used for o/c cum overload application. Voltage restrains o/c relays have their own. application.
Cleanliness Testing. Cleanliness Testing in the printed circuit board and assembly world encompasses the analysis of a specimen to determine the âtypeâ or âamountâ of a contaminant material. This contaminant material can be potentially anything; the material can be large or small and can be unknown, known, expected, or unexpected to the analyst or the requestor.
Nondestructive Testing. Nondestructive testing (NDT) or Nondestructive evaluation (NDE) is a method of materials testing to assess the characteristics of a component without altering or destroying it. NDT is important in the materials testing industry where quick, dependable information on finished or raw material is needed.