What is time multiplier setting in relay?

Time Setting Multiplier (TSM): The time setting multiplier is nothing but an adjusting or speeds up the tripping mechanism of the relay (it is called as the dial). The dial is nothing but a rotating disc, which rotates when the fault current in the relay coil reaches the pickup current.

What is meant by operating time of a protective relay?

Answer: The operating time of a protective relay is defined as the time which elapses between the instant when the actuating quantity exceeds the pickup value to the instant when the relay contacts close. The relay took very small times to close the contacts.

What is time dial setting?

The time dial setting adjusts the time delay before the relay operates whenever the fault current reaches a value equal to, or greater than, the relay current setting.

What is the effect of the time multiplier setting on the time current characteristic of the tested relay?

Time Multiplier Setting used to change the value of operation of the relay. If it is more the relay will take more time to operate and vice versa. Changing the position of TMS setting, changes the distance between the contact of the rotating disk and the coil.

What is meant by time grading in protection systems?

This is a scheme in which the time setting of relays is so consecutive that in the event of a fault, the smallest possible part of the system is isolated.

What is the order of operation of relay time?

The operating time is the time from when the rated voltage is applied to the coil, until the time when the contacts operate. With Relays that have multiple pairs of contacts, if there are no other conditions, then the operating time is the time required for the slowest pair of contacts to operate.

What are the essential elements of a protective relay?

What are the Essential Qualities of Protective Relay?

• Reliability.
• Speed and Time.
• Sensitivity.
• Selectivity and discrimination.
• Stability.
• Simplicity.
• Economy.
• Adequateness.

How do you calculate relay time?

Operating Time of Relay for Normal Inverse Curve (t) =0.14 / ((PSM) 0.02 -1). Operating Time of Previous upstream Relay = Actual operating Time of Relay+ Total Grading Time.

How do you set the operating time of a relay?

Finally that operating time of relay would be multiplied with time setting multiplier, in order to get actual time of operation of relay. Hence say time setting of the relay is 0.1. Therefore the actual time of operation of the relay for PSM 10, is 3 × 0.1 = 0.3 sec or 300 ms.

What is TMS and PMS in relay?

phanibabu January 20, 2020 January 20, 2020 1 Comment. PSM and TMS settings that is Plug Setting Multiplier and Time Multiplier Setting are the settings of a relay used to specify its tripping limits. To understand this concept easily, it is better to know about settings of the Electromechanical Relays.