Power in watt

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Transformer : Neutral and ground is grouped to earth.
Active voltage : 220 sin (90+30)
1.73 x 220 = 380 x 0.865 Vrms
Gas turbine: middle voltage transmission.
Heat measurement : infrared sensor.

Fig.1. MV electrical panel

Heat : circuit breakers. Deviation at 60 degrees celcius. Colour changing is indication ? Temperature limit 70 to 90 degrees celcius.

Fig.2. Distribution pole

Force : BIL sin (180 - x) at cross section. Conductor : dF/dl = BI sin x  and Lenz Law indicates flux angle 0. Current density = integral surface E dS. 

Fig.3. Power transformer

https://en.m.wikipedia.org/wiki/Electric_power_distribution

When damping, magnetic flux in transformer is changing. At its secondary side of its percentage increases. Actual force equals W.

Fig.4. Power disconnector

The disconnector such a surge protector can be installed at primary side of transformer to protect current increasing.

https://www.tokopedia.com/amp/find/trafo-listrik-rumah

Those components are used in electrical networks. At  power distribution,  meter kwh will detect how much energy consumed. The supply and demand are in "watthour".

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