Title:
HIGHER HARMONIC FLOW-OUT AMOUNT EVALUATION SYSTEM
Document Type and Number:
Japanese Patent JP3167620
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To evaluate the flow-out amount of higher harmonics by subjecting a high frequency generation amount measured only at a power receiving point to a corrective operation.
SOLUTION: A higher harmonic order analysis unit 201 is fed, as input signals, with two elements of secondary currents iR, iT of phases R and T from a current transformer 5 for measuring the total load current of a building at the power receiving section in the building along with two elements of secondary voltages VRS, VTS from a voltage transformer 4. High frequency order analysis is then performed based on these current signal (i) and voltage signal V and ±In1 is determined as the vector signal of high frequency current for each order. It is fed to a higher harmonic generation amount evaluation unit 203 as an operation signal vector. A true higher harmonic generation amount In from the load group in a building is outputted from the unit 203 by operating the difference between the apparent higher harmonic current ±In1 measured at the power receiving section and a current In2 flowing into a power capacitor facility. A highly accurate evaluation is realized by applying a higher harmonic flow-out amount evaluation unit 200 to the power receiving part.
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Inventors:
Naoya Yamada
Application Number:
JP17244996A
Publication Date:
May 21, 2001
Filing Date:
July 02, 1996
Export Citation:
Assignee:
Mitsubishi Electric Building Techno Service Co., Ltd.
International Classes:
G01R23/20; G01R29/00; (IPC1-7): G01R29/00; G01R23/20
Domestic Patent References:
| JP9163606A | ||||
| JP8313572A | ||||
| JP843460A |
Attorney, Agent or Firm:
Soga Doteru (6 people outside)
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