Guidelines for successful completion of construction project

Guidelines for successful completion of construction project

POLYVINYL CHLORIDE INSULATED UNSHEATHED AND SHEATHED CABLES/CORDS WITH RIGID AND FLEXIBLE CONDUCTOR FOR RATED VOLTAGES UP TO AND INCLUDING 450/750 V

POLYVINYL CHLORIDE INSULATED UNSHEATHED AND SHEATHED CABLES/CORDS WITH RIGID AND FLEXIBLE CONDUCTOR FOR RATED VOLTAGES UP TO AND INCLUDING 450/750 V

FMEA (failure mode effective analysis)

FMEA (failure mode effective analysis)

TVSS ( transient voltage surge suppression)

TVSS ( transient voltage surge suppression

Brief on various Electrical earthing

Brief on various Electrical earthing

Cummins diesel generator internal parts

cummins diesel generator internal parts

national building code 2005, India

national building code 2005, India

power cable size calculation manual

power cable size calculation manual

ACB parts, operation and fault finding manual

ACB parts, operation and fault finding manual

Shunt trip Vs undervoltage coil in breaker

 "SHUNT RELEASE" & "UNDER_VOLTAGE RELEASE"


SHUNT RELEASE:
This Electrical Device operates by momentary energisation and opens the "Switching Device / Circuit Breaker" by activating the Mechanical Latch. Since, this require energisation hence you NEED A CONTROL SUPPLY either of "it's own inherent" or an "Independent" one, and the other important thing, that this "Release is wired through its NO (Normally open Contact" that ensures supply cessation immediately after OPENING / TRIPPING the "Switching Device. SHUNT Release is generally used for "REMOTE OPENING OF THE SWITCHING DEVICE" but, you can also use it for LOCAL OPENING / TRIPPING of the SWITCHING DEVICE through local Push Button OR through any number of parallel Control Signals. Further this is a MOMENTARY DUTY type Release whose Power supply needs to be interrupted after opening / Tripping the "Switching Device / Circuit Breaker".

NOTE: SHUNT RELEASE does not provide the feature of TRIPPING THE "Switching Device / Circuit Breaker" upon Power supply failure OR Voltage dips


UNDER VOLTAGE RELEASE:
This Electrical Device always NEED ENERGISATION to initially "Closing the SWITCHING DEVICE / Circuit Breaker ", OR to KEEP IT IN CLOSED condition. The SWITCHING DEVICE immediately TRIPS / SWITCHES "OFF" as soon as the Control supply is interrupted through "Local Push Button" or through interlocking Auxiliary Contacts that are wired in Series of its circuit path. Further, this is CONSTANT DUTY Type Release.

NOTE:
1. UNDER VOLTAGE RELEASE offers the feature of TRIPPING THE "Switching Device / Circuit Breaker " upon Power supply failure OR Voltage dips below its "Drop-out Voltage Design", which is generally 80 % of its rated Voltage. This is the reason "Under-voltage Release" is also used as an "UNDER-VOLTAGE RELAY" and most of the "Under-voltage sensitive Circuits", like Motor Feeders are incorporated with this "Release".

2. To avoid nuisance / undesired Tripping of the "Switching Device / Circuit Breaker " on the Voltage Dips OR needing to keep an operator to Re-closing same, a Different Variation of "Under-voltage Release" is available that is fitted with a Capacitor element across its terminals, which prevents the "De-energisation" of "Under-voltage Release" and "Tripping / Opening" of the "Switching Device", and the energy stored in the Capacitive unit is used while the Circuit is deprived of OR drops below the operating Control Voltage range.

Shunt trip function in detail

 More about shunt trip

A shunt trip device is an optional accessory in a circuit breaker that mechanically trips the breaker when power is applied to the shunt trip terminals. The power for the shunt trip does not come from within the breaker, so it must be supplied from an external source. Some circuit breakers allow field installlation of a shunt trip kit, however others require factory installation when the breaker is ordered. Check the specific breaker type for available ac and dc shunt trip voltage ratings and for the method of installation.

A "shunt trip" coil is installed in a circuit breaker to provide remote trip of the breaker but "undervoltage" or "no voltage" coil is installed to provide automatic tripping when loss of power occurs or when there is a major voltage dip.

Shunt trip installation manual