| 摘要 |
<p>A method of operating a meter to perform the steps of generating a measure of real energy consumed, generating a measure of reactive energy consumed, and generating, from the real energy and reactive energy measures, a measure of apparent energy consumed. In one embodiment, the real energy and reactive energy measures are provided as integer quantity inputs. Particularly, assume S = kVAh, P = kWh, Q = kVARh, and R = Residue. Respective registers store values of P, [2P + 1], Q, [2Q + 1], and the sum [P<2> + Q<2>]. Initially, the P, Q, and [P<2> + Q<2>] registers are set to zero, while the [2P + 1] and [2Q + 1] registers are initialized to 1. At the arrival of a P pulse, the value in the [2P +1] register is added to the [P<2> + Q<2>] register, then the P register is incremented by 1 and the [2P + 1] register is incremented by 2. Exactly the same steps are carried out subsequent to receipt of a Q pulse. A set of registers also is used to store the S and [2S + 1] data, and generation of the S pulses is determined as follows. After arrival of either a P or Q pulse, a trial subtraction of [2S + 1] is made from the [P<2> + Q<2>] register. If the subtraction does not cause an underflow, an S pulse is generated, the S register is incremented by 1, and the [2S + 1] register is incremented by 2. If the subtraction causes an underflow, the [P<2> + Q<2>] register is reset to its previous value, the other registers are not incremented, and no S pulse is generated. <IMAGE></p> |
