Gikubkob kini nga gida ang uban pang mga aspeto sa distribution transformers. Gitumong niini ang mga bahin sa pagtukod sama sa core, windings, cooling system, tank ug cover, conservator, pressure relief device, Buchholz relay, silica gel breather, ug winding temperature indicator. Gisama usab niini ang mga paksa sa transport, packing, ug despatch processes, installation procedures, fittings ug accessories, commissioning steps, samtang ang operation ug maintenance guidelines.
Ang transformer dapat naa sa isang maayo - ventilated nga lugar, protektado gikan sa excess dust, corrosive fumes, ug katulak nga contaminants. Importante ang sapat nga ventilation aron makapahimulos sa heat ang transformer tank ug radiators. Kung ang transformer gi-install sa indoor, dugay og 1.25 meters ang kinahanglan nga clear space sa tanang gilid.
Ang foundation kinahanglan matigas, level, ug dry. Sa mga kasong adunay rollers, ang mga appropriate rails kinahanglan ipasabot.
Kinahanglan ang mga arrangements para sa oil draining, sama sa Oil Soak Pits, sa kaso sa fire. Ang fire separation walls usab kinahanglan i-install kung necessary.
Ang mga components nga gisagol alang sa transport dapat maproper nga gi-reassemble. Ang torque values (sa Newton - meters) para sa uban-uban nga fastener sizes (nuts ug bolts) mao kini:
Linisin ang bushings ug suriha ang anumang fine cracks o uban pang damages. Test the insulation resistance (IR) sa bawat bushing gamit ang 500V megger. Ang value dapat wala mosugyot sa 100 megohms. I-record ang detalye sa bushings sa "Commissioning Report". Install all bushings ug siguraduhon nga ang test caps naka-tighten sa reliable grounding.
Adjust the arcing horn gaps according to the requirements of insulation coordination.
Kung ang MOG (presumably a specific component) adunay locking lever, ibutang. Install the conservator. Sa case sa on - load tap changer (OLTC), ang iyang conservator mahimong separate or as a partitioned chamber within the main conservator. Kung ang OLTC conservator adunay separate component, kini usab kinahanglan i-install.
Install the conservator as per the General Arrangement (G.A.) drawing. Usually, ang small conservator for the on - load tap changer connected to the main conservator.
Install the connecting pipe with Buchholz relay between the main tank and the conservator. Siguraduhon nga ang Buchholz relay oriented correctly, with the arrow on it pointing towards the conservator.
Install the breather connecting pipes and silica gel breathers for both the main tank and the OLTC conservators.
Sa panahon sa pag-install sa flexi separator (air cell) sa loob sa conservator, ang sumala nga steps mahimong magamit: (Specific installation steps can be added here according to the actual content. Since no relevant content is provided in the original text, it can be further improved if there is relevant content later.)
Install the air cell inside the conservator. Siguraduhon nga ang hooks sa air cell properly engaged with the brackets inside the conservator.
Suriha ang leaks ug siguraduhon nga wala.
Ang conservator with the air cell tested for pressure sa factory ug dispatched under a slight positive pressure. Konfirmi nga wala leakage sa oil.
Install three air - release valves on the conservator.
Keep the air - release valves open. Attach the air - filling adapter to the breather pipe ug inflate the air cell to the air pressure indicated on the instruction plate affixed to the transformer. Maintain this air pressure.
Open the air - release valves ug start oil filling from the bottom filter valve of the transformer.
Monitor the air - release valves. As soon as oil starts to overflow, close the air - release valves one by one. Stop oil filling when all air - release valves are closed.
Remove the air - filling adapter.
Continue oil filling ug observe the Magnetic Oil Level Gauge (MOLG).
Stop filling when the needle of the MOLG reaches the level corresponding to the ambient temperature during filling.
Install the silica - gel breather.
Do not open any of the air - release valves after oil filling is completed. If an air - release valve is opened, air will enter and the oil level will drop.
The ordinary oil - level gauge on the end - cover of the conservator should always indicate a full oil level.
If air enters the conservator, a drop in the oil level on the ordinary oil - level gauge will indicate it.
Regularly monitor the ordinary oil - level gauge.
With the separator installed, the conservator is positioned and connected above the transformer, and its lower part is linked to the oil - filling reserve via a pipe. Proceed as follows:
Create a vacuum inside the separator.
Using the same vacuum source, create a vacuum in the conservator.
Open the oil - filling valve of the transformer. Due to the vacuum in the conservator, the oil level will rise automatically.
Stop oil filling once the required volume is reached in the conservator.
While maintaining the vacuum in the conservator, allow dry air or nitrogen gas to enter the interior of the separator. The separator will then inflate on its own and occupy the free space, as the conservator is not completely full. During operation, in particular, the oil will rise to the top of the conservator.
Inflate the separator to the maximum level indicated on the instruction plate.
Check the vent holes and confirm that there is no residual air in the conservator. Adjust the oil level if necessary.
The floats of the Buchholz relay are tied up during transportation to prevent damage. They should now be released. Additionally, if a 'Test' lever is present, it should be set to the working position.
If an On - Load Tap Changer (OLTC) is provided, it may have its own separate breather.
Check that the color of the silica gel in the main breather is blue.
Remove the rubber cap that closes the breather pipe and the breather.
Fill oil in the oil cup and remove the seal that closes the breather opening.
Similarly, install the OLTC breather.
Radiators should be assembled one at a time. The oil required to fill the radiators is shipped separately in drums. Test an oil sample from each drum for Breakdown Voltage (BDV). Ensure it exceeds the minimum value specified in Indian Standard (I.S.) 1866 for new transformers.
If an oil filter machine is available, use it to fill the conservator completely with oil.
Clean the exterior of one radiator. Remove the blanking plates and clean the gaskets and radiator flanges. If the gaskets are damaged, replace them with spare gaskets.
If the blanking plates are not in place and there is suspicion that foreign material may have entered the radiators, clean their interiors by flushing with fresh and clean transformer oil.
Oil may seep through the tank - side radiator valves and be retained by the blanking plates. This oil should be collected in a clean container when removing the top and bottom blanking plates.
Align the radiator flanges with those on the tank. Ensure that the tank gasket is in position. Fasten them with bolts, nuts, spring washers, etc.
Use the operating handle to open the bottom radiator valve. Gradually unscrew the air - release plug on top of the radiator until air starts to escape.
Do not fully remove the air - release plug from its threads, as it will be difficult to control the oil flow. Close the air - release plug when oil flows steadily from it and no more air comes out.
Open the top radiator valve. The oil level in the conservator will now have dropped. Check for any oil leakage from the radiator itself and the gasket joints.
Restore the oil level and assemble the next radiator in the same manner.
