Solar Electrical Learning Part-17||Week-17||To keep tripping system of 33 KV sub-station operational, use old solar panels.

Steemian Friends,
Today, I will write my Solar Electrical Learning Part-17. Today I will show the troubleshooting and solar maintenance work of my office solar project. I hope everyone will benefit from writing about my learning part on Solar.

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I am in charge of the 33 KV substation of our company. The total power supply to our factory is 20 MW. This electricity connection has been provided by the company called DPDC of our country. Some conditions have been given for the supply of 20 MW power from the Government Power Generation Board of our country. One of the conditions is that a 1.5 KW solar project will provide a 20 MW power supply. For this, we have installed a 1.5 KW solar project.

110-volt supply plays a very important role in 33 KV substations. If the tripping devices are not on, there can be major damage to the substation device. So solar project is mandatory in every 33 KV sub station in our country.

The tripping devices of the electrical 33KV substation's controlling panel are of 110 volts. We call them IDMT relay, Annunciator in engineering language. These devices operate at 110 volts. So, a 110-volt supply is required to keep the devices functional. 110-volt supply is provided in two ways.

33 KV 110 Volt Device

• Surging the battery directly using a 220/110-volt transformer while the power is connected.
• When there is no power supply, a 110-volt supply is provided by charging the battery through solar panels.

If, for some reason, there is no 110-volt supply, the tripping option will not work. Many times, some VCB coils are operated at 110 volts. Then, the supply cannot be turned on or off unless 110 volts are present in the coil. Therefore, solar projects at 33 KV substations have been made mandatory.

Today, I noticed that my panel does not have a 110-volt supply. Then I urgently need to check the solar panel. I took my electrical team to the roof of a seven-story building and checked the solar panels. I am getting the following problems with the solar panel.

Me & my electrical team

• It is currently summer in our country. It has not rained for a long time. Due to the lack of rain, a layer of dirt has worn on the solar panels. The solar cells were not working due to dirt.

Dirt shuts off solar panel supply

• Solar panels had bird droppings in the cells. We know bird droppings are harmful to solar cells. That is why the supply from the solar panel was off.

Bird droppings shut off solar cell supply

Then, I try to clean the dirt from the top of the solar panel with my electrical team. I warn my team not to damage the solar cell. Then, I check the solar connections. Then, I check the inverter through the output terminal of the panel. I check the battery charging through the inverter.

When switching on the inverter(1.5 KW) supply

110-voltage battery supply

Then, I measured the output voltage of the MCB in the charging panel with a digital multimeter and got 110 volts. The DC output voltage in the panel is 110 on the analog meter. Solar panels are basically used for uninterrupted supply.

110-volt supply panel

In our country, if the load is high, the electricity supply companies have made it mandatory to install solar projects by calculating the specific load.