What is a microprocessor based relay?
A microprocessor-based relay system is used in combination with relay contactors and a control circuit therefor to protect an electric motor from overload currents in addition to phase faults, ground faults, load losses, and load jams.
What is the advantage of microprocessor based relay?
Microprocessor-based relays offer many advantages over schemes using discrete components. The overall scheme takes up less panel space. The number of components is greatly reduced. The design and wiring is simpler and less costly to implement.
What are the applications of microprocessor relay?
Microprocessor-based relays provide technical improvements and cost savings in several ways: The relays use programmable logic to reduce and simplify wiring. The relays provide protection for bus faults, breaker failure, and high-side transformer blown fuse detection at no or minimal additional cost.
Which relay is used for feeder?
Translay relay: The arrangement is similar to overcurrent relay, but the secondary winding is not closed on itself. These types of relays are used in the feeder protection and the scheme is called the Translay scheme.
How do I set up an overcurrent relay?
Calculation of Over Current Relay Setting:
- Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp.
- Required Over Load Relay Plug Setting= Over Load Current (In) / CT Primary Current.
- Required Over Load Relay Plug Setting = 480 / 600 = 0.8.
What is the disadvantage of microprocessor based relay?
Modern relay protection and automation devices are built on a microprocessor-based elemental base (we denote them as MP device)….Advantages and disadvantages of microprocessor relay protection.
| + | – |
|---|---|
| may be part of industrial control system | needs information security |
| self diagnosis | narrow operating temperature range |
| resistance to mechanical stress | |
| simpler selection of settings |
What is the disadvantages of microprocessor?
Disadvantages of a microprocessor: The main disadvantages are it’s overheating physically. It is only based on machine language. The overall cost is high. The large size of PCB is required for assembling all components.
What is a microprocessor-based relay?
Microprocessor relays provide many functions that were not available in electromechanical or solid-state designs. Relay logic is very important to understand the microprocessor-based relay. The relay can be ON or OFF, that is, it has two stable states.
Can overcurrent relays be used for TK-85 programming?
A proposed scheme of overcurrent relays dealing with programming of the single-board microcomputer TK-85, built by NEC around Intel’s 8-bit 8085 microprocessor, is described. Experimental results with better relay characteristic performances and high flexibility for implementing the desired value of n, including noninteger values, are obtained.
What are the advantages and disadvantages of microprocessor relay?
1 Introduction. Microprocessor relays provide many functions that were not available in electromechanical or solid-state designs. 2 Advantages of microprocesser based relay: Very efficient and reliable. Highly accurate. Very fast in operation. Programmable in nature. A unit can perform retransmission of several systems. 3 Also read
What is the inverse over current relay type?
The inverse over current relay types are associated with operation time which is inversely proportional (in certain degrees) to the over current ratio [1]. A low cost portable ,reliable, fast screening technology propone the usage of gas and optical sensing technology for the testing of transformer oil [3].