Answer / v.govindarajulu

In Thermal Magnetic Release shortly known as TMD release
gives two types of Protection which are overload and short
circuit Protection, In termal Property ( ie metal gets
elongated when heating) is used to sense the overload (
over curent causes high heat in bimettalic strip). and
Magnetic Property (ie Magnectic Flux / induction) is used
to sense the short circuit.

note: short circuit protection needs quick trip than
overload trip thats why thermal trip is used for Overload
Protection And Magnetic Property is used for shortcircuit
Protection.


In Microprocessor release, sensing and triping executed by
Micrprocessor in gives the very faster response than TMD
Release. Normally Microprocessor based release gives LSI
Protection. ( G is Optional)

Answer / manojkrishnan

The thermal-magnetic release tripping circuit works with the
advantage of bimetallic strip, on which a heating element is
wound and so it needs particular time to trip ( heat up the
metallic strip > open circuit the holding coil > opens the
contacts ) .But the microprocessor based CB trips more
rapidly as we can set the tripping current,sensitivity and
tripping time more accurately with the help of a CT or a
current sensing resistor (in DC ).

Answer / naveen sahariya

fault sensing time is less in microprocessor release

Answer / mustafa

Thermal magnetic uses bimetallic strips- manual reset

Answer / naveen

in thermal magnetic release movement of the parts involved
where as in microprocessor based release is static device
no wear and tear

which bulb is greater iluminited, 60w and 100w are conected in series?

2 Answers  

What is Bolted fault?

0 Answers  

what happen if we give 220 volts dc supply to d bulb r tube light?

9 Answers   NHPC,

-What shall be short circuit current of LV switchgear for a 1000 kva, 11.415kv, 3 phase tranformer with 5% reactance.

0 Answers  

I want the details about BHEL company examination.Can anyone able to help me please.

0 Answers  

Why are the HV motors are connected in star connection?

5 Answers  

Is pure capacitor load and pure inductor load is an linear load? pls justify

2 Answers  

WANTCONTACT NUMBER & EMAIL/ WEBSITE TO CONTACT THE SECRETARY,MADHYA PRADESH LICENSING BOARD(ELECTRICAL),K- BLOCK,3RD FLOOR,SATPOODA BHAWAN,BHOPAL

0 Answers  

what is meant by reactive power ,active power & real power ? thank you

2 Answers  

Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

2 Answers  

How much ampere rating on LT side of distribution transformer and also on HT side of 200KVA transformer

2 Answers   ABB,

how to determine ct ratio in ht vcb?

0 Answers   Techno Engineering,