JPS6480874A - Electronic watthour meter - Google Patents
Electronic watthour meterInfo
- Publication number
- JPS6480874A JPS6480874A JP62237458A JP23745887A JPS6480874A JP S6480874 A JPS6480874 A JP S6480874A JP 62237458 A JP62237458 A JP 62237458A JP 23745887 A JP23745887 A JP 23745887A JP S6480874 A JPS6480874 A JP S6480874A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase
- open
- level
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To accurately identify even an open-phase state wherein electric energy is not measured by controlling a display means according to the open-phase signal and power failure signal of a three-phase three-wire AC power source. CONSTITUTION:An I-side open-phase signal and a III-side open-phase signal (b) from the main body part 1 of the electronic watthour meter of the three- phase three-wire AC power source are normally high-level signals and an active electric energy pulse signal (c) and a reactive electric energy pulse signal (d) supplied to the 2nd data input B of a selector 39 are displayed at a frequency of 2Hz. Further, if either of the I side and III sides enters an open-phase state, the signal (a) or (b) falls to a low level, the selector 39 selects a 1Hz signal (g), and a display part 7 displays it at a frequency of 1Hz, so that the occurrence of the open phase state is identified. Further, if the three-phase three-wire AC power source enters a power failure state and an AC off signal (f) rises to a high level, the output of a NAND circuit 35 rises to high level and a high- level AC off signal (f) is lighted and displayed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62237458A JPS6480874A (en) | 1987-09-24 | 1987-09-24 | Electronic watthour meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62237458A JPS6480874A (en) | 1987-09-24 | 1987-09-24 | Electronic watthour meter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6480874A true JPS6480874A (en) | 1989-03-27 |
Family
ID=17015639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62237458A Pending JPS6480874A (en) | 1987-09-24 | 1987-09-24 | Electronic watthour meter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6480874A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04127067A (en) * | 1990-06-01 | 1992-04-28 | Mitsubishi Electric Corp | Power failure display apparatus of electronic measuring device |
-
1987
- 1987-09-24 JP JP62237458A patent/JPS6480874A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04127067A (en) * | 1990-06-01 | 1992-04-28 | Mitsubishi Electric Corp | Power failure display apparatus of electronic measuring device |
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