The Millivolt-Ampere Reactive Hour (mVARh) is an intriguing unit utilized to measure reactive energy in electrical systems, which might not be as well-known as its real power counterpart, the Watt. Reactive power is essential for maintaining voltage stability in alternating current systems, as it helps to energize the magnetic fields in motors and transformers. Without proper control of reactive power, the efficiency and reliability of power grids would significantly diminish.
An interesting aspect of reactive power is that it generates no useful work by itself, yet it is crucial for the functioning of AC systems. Engineers carefully manage reactive power to reduce losses and improve the quality of power delivery. So next time you hear about power consumption, remember that it’s not just about watts—a seamless supply also relies heavily on managing units like the mVARh.
The kilovolt-ampere reactive hour (kVARh) is a unit used to measure reactive energy, an essential concept in the realm of alternating current (AC) electrical systems. Reactive energy differs from active energy, in that it does not do useful work but is crucial for maintaining voltage levels necessary for the stability and efficiency of electricity networks. This energy arises due to the presence of inductive and capacitive loads, such as motors and transformers, in the power system.
Interestingly, despite reactive power not performing work directly, it has a direct impact on the efficiency and cost-effectiveness of power delivery. Utilities often impose charges based on reactive energy consumption to encourage users to improve their power factor, thereby optimizing their energy use and relieving stress on the grid infrastructure. Understanding and managing kVARh can lead to significant cost savings and enhanced grid reliability.
Millivolt-Amperes Reactive Hour | Kilovolt-Amperes Reactive Hour |
---|---|
0
mVARh
|
0
kVARh
|
10000
mVARh
|
0.01
kVARh
|
20000
mVARh
|
0.02
kVARh
|
30000
mVARh
|
0.03
kVARh
|
40000
mVARh
|
0.04
kVARh
|
50000
mVARh
|
0.05
kVARh
|
60000
mVARh
|
0.06
kVARh
|
70000
mVARh
|
0.07
kVARh
|
80000
mVARh
|
0.08
kVARh
|
90000
mVARh
|
0.09
kVARh
|
100000
mVARh
|
0.1
kVARh
|
110000
mVARh
|
0.11
kVARh
|
120000
mVARh
|
0.12
kVARh
|
130000
mVARh
|
0.13
kVARh
|
140000
mVARh
|
0.14
kVARh
|
150000
mVARh
|
0.15
kVARh
|
160000
mVARh
|
0.16
kVARh
|
170000
mVARh
|
0.17
kVARh
|
180000
mVARh
|
0.18
kVARh
|
190000
mVARh
|
0.19
kVARh
|
200000
mVARh
|
0.2
kVARh
|
210000
mVARh
|
0.21
kVARh
|
220000
mVARh
|
0.22
kVARh
|
230000
mVARh
|
0.23
kVARh
|
240000
mVARh
|
0.24
kVARh
|
250000
mVARh
|
0.25
kVARh
|
260000
mVARh
|
0.26
kVARh
|
270000
mVARh
|
0.27
kVARh
|
280000
mVARh
|
0.28
kVARh
|
290000
mVARh
|
0.29
kVARh
|
300000
mVARh
|
0.3
kVARh
|
310000
mVARh
|
0.31
kVARh
|
320000
mVARh
|
0.32
kVARh
|
330000
mVARh
|
0.33
kVARh
|
340000
mVARh
|
0.34
kVARh
|
350000
mVARh
|
0.35
kVARh
|
360000
mVARh
|
0.36
kVARh
|
370000
mVARh
|
0.37
kVARh
|
380000
mVARh
|
0.38
kVARh
|
390000
mVARh
|
0.39
kVARh
|
400000
mVARh
|
0.4
kVARh
|
410000
mVARh
|
0.41
kVARh
|
420000
mVARh
|
0.42
kVARh
|
430000
mVARh
|
0.43
kVARh
|
440000
mVARh
|
0.44
kVARh
|
450000
mVARh
|
0.45
kVARh
|
460000
mVARh
|
0.46
kVARh
|
470000
mVARh
|
0.47
kVARh
|
480000
mVARh
|
0.48
kVARh
|
490000
mVARh
|
0.49
kVARh
|
500000
mVARh
|
0.5
kVARh
|
510000
mVARh
|
0.51
kVARh
|
520000
mVARh
|
0.52
kVARh
|
530000
mVARh
|
0.53
kVARh
|
540000
mVARh
|
0.54
kVARh
|
550000
mVARh
|
0.55
kVARh
|
560000
mVARh
|
0.56
kVARh
|
570000
mVARh
|
0.57
kVARh
|
580000
mVARh
|
0.58
kVARh
|
590000
mVARh
|
0.59
kVARh
|
600000
mVARh
|
0.6
kVARh
|
610000
mVARh
|
0.61
kVARh
|
620000
mVARh
|
0.62
kVARh
|
630000
mVARh
|
0.63
kVARh
|
640000
mVARh
|
0.64
kVARh
|
650000
mVARh
|
0.65
kVARh
|
660000
mVARh
|
0.66
kVARh
|
670000
mVARh
|
0.67
kVARh
|
680000
mVARh
|
0.68
kVARh
|
690000
mVARh
|
0.69
kVARh
|
700000
mVARh
|
0.7
kVARh
|
710000
mVARh
|
0.71
kVARh
|
720000
mVARh
|
0.72
kVARh
|
730000
mVARh
|
0.73
kVARh
|
740000
mVARh
|
0.74
kVARh
|
750000
mVARh
|
0.75
kVARh
|
760000
mVARh
|
0.76
kVARh
|
770000
mVARh
|
0.77
kVARh
|
780000
mVARh
|
0.78
kVARh
|
790000
mVARh
|
0.79
kVARh
|
800000
mVARh
|
0.8
kVARh
|
810000
mVARh
|
0.81
kVARh
|
820000
mVARh
|
0.82
kVARh
|
830000
mVARh
|
0.83
kVARh
|
840000
mVARh
|
0.84
kVARh
|
850000
mVARh
|
0.85
kVARh
|
860000
mVARh
|
0.86
kVARh
|
870000
mVARh
|
0.87
kVARh
|
880000
mVARh
|
0.88
kVARh
|
890000
mVARh
|
0.89
kVARh
|
900000
mVARh
|
0.9
kVARh
|
910000
mVARh
|
0.91
kVARh
|
920000
mVARh
|
0.92
kVARh
|
930000
mVARh
|
0.93
kVARh
|
940000
mVARh
|
0.94
kVARh
|
950000
mVARh
|
0.95
kVARh
|
960000
mVARh
|
0.96
kVARh
|
970000
mVARh
|
0.97
kVARh
|
980000
mVARh
|
0.98
kVARh
|
990000
mVARh
|
0.99
kVARh
|
1000000
mVARh
|
1
kVARh
|
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