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.
Definition of:stateful inspection. A firewall technology that ensures that all inbound packets are the result of an outbound request. Also called stateful packet inspection (SPI), it was designed to prevent harmful or unrequested packets from entering the computer.tateful inspection is the norm and generally a major component in every network firewall and personal firewall. However, stateful inspection causes problems with videoconferencing and VoIP, in which a user outside the network wants to initiate a communication with a user inside the network.