MONITORING METHOD AND MONITORING SYSTEM

To provide monitoring technology that is advantageous from the cost point of view.SOLUTION: A second phase voltage between a neural line 10o and a second ungrounded electric wire 10b is detected. A line-to-line voltage between a first ungrounded electric wire 10a and the second ungrounded electric w...

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Bibliographic Details
Main Authors SHIMOMURA TAKUYA, KONNO HIRONORI
Format Patent
LanguageEnglish
Japanese
Published 29.08.2019
Subjects
CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
SYSTEMS FOR STORING ELECTRIC ENERGY
TESTING
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Summary:To provide monitoring technology that is advantageous from the cost point of view.SOLUTION: A second phase voltage between a neural line 10o and a second ungrounded electric wire 10b is detected. A line-to-line voltage between a first ungrounded electric wire 10a and the second ungrounded electric wire 10b is detected. A voltage for conversion that appears in a resistor 25 for current detection provided in the second ungrounded electric wire 10b is detected. A difference between a detection value representing the line-to-line voltage and a detection value representing the second phase voltage is calculated using a calculation unit 31 so that a calculated value representing a first phase voltage between the neutral line 10o and the first ungrounded electric wire 10a is obtained. The calculated value representing the first phase voltage, the detected value representing the second phase voltage and the detected value representing the voltage for conversion are conveyed to a control device 35 via a single insulating circuit 34. The calculation unit 31 and the insulating circuit 34 operate using electric power supplied from a power supply 74b, with the potential of the second ungrounded electric wire 10b used as a reference voltage.SELECTED DRAWING: Figure 1 【課題】コストの観点から有利なモニタリング技術を提供する。【解決手段】中性線１０ｏと第２非接地電線１０ｂとの間の第２相電圧を検出する。第１非接地電線１０ａと第２非接地電線１０ｂとの間の線間電圧を検出する。第２非接地電線１０ｂ上に設けられた電流検出用抵抗部２５に現れる換算用電圧を検出する。中性線１０ｏと第１非接地電線１０ａとの間の第１相電圧を表す計算値が得られるように、計算部３１を用いて線間電圧を表す検出値と第２相電圧を表す検出値との差を計算する。第１相電圧を表す計算値、第２相電圧を表す検出値および換算用電圧を表す検出値を、単一の絶縁回路３４を介して制御装置３５に伝達する。計算部３１および絶縁回路３４は、第２非接地電線１０ｂの電位を基準電位とする電源７４ｂから供給される電力を用いて動作する。【選択図】図１
Bibliography:Application Number: JP20180028067