Kasancewar Jirageni na Ayyuka
Babban abubuwan da muna iya magancewa a cikin zaɓuɓɓukan kula sun hada da:
Safinta ƙaramin kuli na daban-daban
Kadansu mai ƙari na duka kula da suka gaji
Girmanan kadansu na duka ƙungiyoyi na kula
Duka girmanan mai ƙari hatta wanda ba suka shiga ƙungiyoyin kula ba
Tsarin Magancewa
Na taka duka safinta da muna iya magancewa zuwa gridin magancewa ta hanyar madara mai karfi da ake sauye. Na sanya madaran a kan tsawon 600 mm zuwa kusa. Idan waɗannan madara mai karfi suka haɗe wata jage, ƙasa, pipawa ko ƙarshe, yana da kyau a sanya waɗannan madara suka haɗe wannan manyan abubuwa tun daga ƙarin 300 mm.
Hakanan ne na amfani da madara mai karfi don inganta gridin magancewa a kan kusa, amma a kan gabashin kusa na amfani da flat MS. Ana kiran ingantaccen waɗannan safinta da gridin magancewa a kan gabashin kusa a matsayin riser. A kan gabashin kusa ana amfani da flat MS. Kafin a kan kusa, waɗannan madara suna ƙunshi waɗannan madara da ake amfani don inganta gridin magancewa masu uku.
Yana da kyau a taka duka kayan aiki zuwa gridin magancewa ta hanyar duwatsu risers. Wannan yana nufin cewa babu riser ya zama daga x na y.
Ana kiran taka duka ƙungiyoyin a cikin hakan. Ana taka duk sabbin box na isolator zuwa maten magancewa mai biyu, kuma ana taka duk maten magancewa zuwa gridin magancewa mai uku. Ana sanya duk maten magancewa zuwa kusan 300 mm. Ana taka flat MS zuwa paden magancewa ta hanyar nut bolts, kuma yana da kyau a sake ruɗuwa aiki a lokacin da ake buƙata. Ba a iya taka weld a wannan wurin ba. Ana taka lead zuwa gridin magancewa ta hanyar weld. Flat MS a kan gabashin kusa yana da kyau a taka weld zuwa madara a kan kusa. Yana da kyau a sake ruɗuwa weld points ta hanyar red lead da bitumen.
Magancewa Tower Gantry
Wire mai hafiya yana ƙaretsa a kan ƙarfin gantry. Wire mai hafiya wanda yake ƙaretsa a kan ƙarfin gantry an kiran downcomer. An fitowa downcomer a kan ƙarfin gantry kadan kadan 2 mita. An taka downcomer zuwa earthing lead zuwa electrode mai pipe. Ƙarfin gantry na farko yana da kyau a taka zuwa gridin magancewa mai uku ta hanyar riser.
Magancewa Bus Post Insulator
Har da BPI na ƙarfin bus post insulator ana taka zuwa gridin magancewa mai uku ta hanyar duwatsu risers. Flat MS da tsawon 50 mm × 10 mm yana ƙaretsa a kan ƙarfin BPI support structure daga baya. Ana taka flat MS zuwa risers zuwa x da y conductor na gridin magancewa mai uku.
Magancewa Current Transformer
Flat MS da tsawon 50 mm × 10 mm yana ƙaretsa a kan ƙarfin current transformer support structure daga baya. Ana taka flat MS zuwa gridin magancewa mai uku ta hanyar riser. Ƙarfin gantry na farko yana da kyau a taka zuwa gridin magancewa mai uku ta hanyar riser. Idan riser na farko ya zama daga x conductor na ground grid, riser na biyu yana da kyau a zama daga rod conductor na y direction.
Box junction na CT yana da kyau a taka zuwa gridin magancewa mai uku ta hanyar flat MS da tsawon 50 mm × 10 mm.
Magancewa Circuit Breaker
Supporting structure of each pole of a circuit breaker along with the metallic base of the poles are connected to the main earthing grid via two risers one preferably from x and other from y direction. The structure of the poles are connected together with 50 mm × 8 mm ms flat. The mechanism box of each pole is also connected to the main earthing grid via 50 mm × 10 mm ms flat.
Magancewa Isolator
The base of each pole of the isolator should be connected together with the help of one 50 mm × 10 mm ms flat. This ms flat will be connected to the main earthing grid via two risers one preferably from x and other from y direction earth mat conductors. The mechanism box of the isolator should be connected to the auxiliary earth mat and the auxiliary earth mat then connected to the main earthing grid to two different points on the main earthing grid.
Magancewa Lightning Arrestors
The base of the lightning arrestors must be connected to the main earthing grid via one riser and structure of the lightning arrestors must be connected to the main earthing grid via another riser. One extra earthing connection is provided in lightning arrestors which connects a treated earth pit via surge counter of the arrestors. This earth pit may be with test link.
Magancewa Capacitive Voltage Transformer
The base of the CVT or capacitive voltage transformer is connected to the main earthing grid via a riser. The special earthing point on the base of the CVT is connected to the pipe earth electrode with 50 mm × 8 mm ms flat. The bottom portion of the support structure is also connected to the main earthing grid via riser. Two opposite earthing points of the CVT junction box should also be connected to the main earthing grid.
Magancewa Cable Sealing System
The supporting structure of a cable sealing system should be connected to the main earthing grid via two risers. The earthing strip of size 50 mm × 10 mm ms flat must come down from the top of the supporting structure.
Magancewa Bay Marshalling Kiosk
There are two protected leads provided on two opposite sides of the bay marshalling kiosk. These two points must be connected to the main earthing grid via two risers. These links are provided on the lower portion of the marshalling kiosk or box.
Magancewa Earthing Transformer
The base of the earthing transformer must be connected to the main earthing grid via two risers. The neutral point of the earthing transformer must be connected to the pipe earth electrode with a test link. The neutral to ground connection should go through a neutral current transformer for earth fault protection purpose.
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