Megger | Tushen Kudin Dukia Turuwanta Biyuwar Megger
Tarihin Megger
A cikin shekarar 1889 an yi amfani da wannan wurin, tsohon fara ta fitar da shi a shekarun 1920. A nan daidai an yi amfani da shi don inganta ayyuka masu tsarin kula da yawan tsarin kula. A baya mafi kyau na iya amfani da shi saboda yadda ake gina shi da kuma kayayyakin da suka samu. Duk da haka, a baya mafi kyau na iya amfani da shi da kuma ya zama cikakken fahimta.
Misau ne Megger?
Yawan tsarin kula na ayyukan kula ta yi lalacewa a lokacin yana wuce, musamman ga wasu yanayin adadin jiki, na'amantar, sanyi, da kuma abubuwan dust. Yana iya ci nasara a kan yawan tsarin kula saboda yadda ake amfani da shi don kula da kuma yadda ake amfani da shi. Saboda haka, yana da muhimmanci a yi nuna yawan tsarin kula (IR) na ayyukan kula a kowane lokaci don in ba a tabata ma'ana mai yawa ko kula mai yawa.
Amfani da Megger
Wurin ya amfani da shi don nuna yawan kula mai yawa a kabilu, amsa sun fi dacewa saboda ake amfani da kula don kula a lokacin da ake nuna. Wannan wurin ya amfani da shi don inganta yawan tsarin kula na ayyukan kula kamar motors, cables, generators, windings, k.s.a. Wannan nuna yana da muhimmanci sosai kuma an yi shi tun lokacin da yake. Ba ake bukatar a nuna wurin mai yawa amma ake bukatar a nuna yawan kula mai yawa da kuma yawan sanyi a cikin ayyukan kula/winding/system.
Abubuwan Megger
Zan iya koyar da abubuwan wannan wurin a biyu:
Electronic Type (Battery Operated)
Manual Type (Hand Operated)
Amma akwai nau'o'i na biyu na megger wanda ba ake amfani da battery don kula, amma ake bukatar external source don in tafara motor elektrik wanda za a tafara generator na megger.
Electronic Type Megger
Muhimman abubuwa:
Digital Display :- Display digital don nuna yawan IR a form digital.
Wire Leads :- Biyo na wire leads don konektar megger da system electrical na waje don in nuna.
Selection Switches :- Switches don zaba ranges na electrical parameters.
Indicators :- Don nuna status na parameters i.e. On-Off. Misali Power, hold, Warning, k.s.a.
Note: – Babu construction na biyu na duka abubuwan megger, ana iya kasance daga wanda ke ginshi zuwa wanda ke ginshi amma construction na uku da operation suka dacewa duka.
Fadada Electronic Type Megger
Level of accuracy is very high.
IR value is digital type, easy to read.
One person can operate very easily.
Works perfectly even at very congested space.
Very handy and safe to use.
Kashe-kashe na Electronic Type Megger
Require an external source of energy to energies i.e. Dry cell.
Costlier in market.
Hand Operated Megger
Muhimman abubuwa:-
Analog display:- Analog display provided on front face of tester for IR value recording.
Hand Crank:- Hand crank used to rotate helps to achieve desired RPM required generate voltage which runs through electrical system.
Wire Leads:- Used same as in electronic tester i.e. For connecting tester with electrical system.
Fadada Hand Operated Megger
Still keeps important in such high-tech world as it’s an oldest method for IR value determination.
No external source required to operate.
Cheaper available in market.
Kashe-kashe na Hand Operated Megger
At least 2 person required to operate i.e. one for rotation of crank other to connect megger with electrical system to be tested.
Accuracy is not up to the level as it’s varies with rotation of crank.
Require very stable placement for operation which is a little hard to find at working sites.
Unstable placement of tester may impact the result of tester.
Provides an analog display result.
Require very high care and safety during use of the same.
Construction of Megger
Circuit Construction features :-
Deflecting and Control coil : Connected parallel to the generator, mounted at right angle to each other and maintain polarities in such a way to produced torque in opposite direction.
Permanent Magnets : Produce magnetic field to deflect pointer with North-South pole magnet.
Pointer : One end of the pointer connected with coil another end deflects on scale from infinity to zero.
Scale : A scale is provided in front-top of the megger from range ‘zero’ to ‘infinity’, enable us to read the value.
D.C generator or Battery connection : Testing voltage is produced by hand operated DC generator for manual operated Megger. Battery / electronic voltage charger is provided for automatic type Megger for same purpose.
Pressure Coil Resistance and Current Coil Resistance : Protect instrument from any damage because of low external electrical resistance under test.
Working Principle of Megger
Voltage for testing produced by hand operated megger by rotation of crank in case of hand operated type, a battery is used for electronic tester.
500 Volt DC is sufficient for performing test on equipment range up to 440 Volts.
1000 V to 5000 V is used for testing for high voltage electrical systems.
Deflecting coil or current coil connected in series and allows flowing the electric current taken by the circuit being tested.
The control coil also known as pressure coil is connected across the circuit.
