JPH01150431U - - Google Patents
Info
- Publication number
- JPH01150431U JPH01150431U JP4537988U JP4537988U JPH01150431U JP H01150431 U JPH01150431 U JP H01150431U JP 4537988 U JP4537988 U JP 4537988U JP 4537988 U JP4537988 U JP 4537988U JP H01150431 U JPH01150431 U JP H01150431U
- Authority
- JP
- Japan
- Prior art keywords
- measured
- signal
- cycle
- frequency
- measuring means
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Manipulation Of Pulses (AREA)
Description
第１図はこの考案の一実施例の構成を説明する
ための概略ブロツク図、第２図はこの考案の一実
施例に係る周波数継電器の具体的な回路例を示す
構成ブロツク図、第３図は第２図の動作を説明す
るためのタイミング図、第４図は従来のデジタル
計数型周波数継電器の概略構成ブロツク図、第５
図は周波数継電器が備えられた設備の一例を示す
ブロツク図である。
１１…方形波変換回路、１２…第１の周波数計
数回路、１３…第２の周波数計数回路、２０…周
波数変化検出回路、２１…回路保護機構、Ａ…被
測定交流信号。
FIG. 1 is a schematic block diagram for explaining the configuration of an embodiment of this invention, FIG. 2 is a block diagram showing a specific circuit example of a frequency relay according to an embodiment of this invention, and FIG. 3 2 is a timing diagram for explaining the operation, FIG. 4 is a schematic block diagram of a conventional digital counting type frequency relay, and 5 is a timing diagram for explaining the operation of FIG.
The figure is a block diagram showing an example of equipment equipped with a frequency relay. DESCRIPTION OF SYMBOLS 11... Square wave conversion circuit, 12... First frequency counting circuit, 13... Second frequency counting circuit, 20... Frequency change detection circuit, 21... Circuit protection mechanism, A... AC signal to be measured.
Claims (1)
周波数が予定値になつた時に回路保護のための動
作をする周波数継電器において、 上記被側定交流信号の各周期における前半半周
期の長さを測定する第１の測定手段と、上記被測
定交流信号の各周期における後半半周期の長さを
測定する第２の測定手段と、予め定められた基準
値を出力する基準値出力手段と、上記第１の測定
手段および第２の測定手段の出力を交互に上記基
準値と比較し、被測定交流信号の周波数の変化を
半周期単位で検出する比較検出手段と、上記比較
検出結果に基づいて動作する回路保護機構とを含
むことを特徴とする周波数継電器。[Claims for Utility Model Registration] In a frequency relay that detects changes in the frequency of an AC signal to be measured and operates to protect the circuit when the frequency reaches a predetermined value, each period of the constant AC signal to be measured a first measuring means for measuring the length of the first half cycle in each cycle of the AC signal to be measured; a second measuring means for measuring the length of the second half half cycle in each cycle of the AC signal to be measured; and outputting a predetermined reference value. and comparison detection means for alternately comparing the outputs of the first measuring means and the second measuring means with the reference value to detect changes in the frequency of the AC signal to be measured in half-cycle units. , and a circuit protection mechanism that operates based on the comparison detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4537988U JPH01150431U (en) | 1988-04-04 | 1988-04-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4537988U JPH01150431U (en) | 1988-04-04 | 1988-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01150431U true JPH01150431U (en) | 1989-10-18 |
Family
ID=31271692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4537988U Pending JPH01150431U (en) | 1988-04-04 | 1988-04-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01150431U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0374214A (en) * | 1989-05-29 | 1991-03-28 | Mitsubishi Electric Corp | Controller for suspension or stabilizer |
| JP2001320882A (en) * | 2000-05-09 | 2001-11-16 | Matsushita Electric Ind Co Ltd | Power supply apparatus, inverter and air conditioner |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58218823A (en) * | 1982-06-11 | 1983-12-20 | 富士電機株式会社 | Digital frequency relay |
-
1988
- 1988-04-04 JP JP4537988U patent/JPH01150431U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58218823A (en) * | 1982-06-11 | 1983-12-20 | 富士電機株式会社 | Digital frequency relay |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0374214A (en) * | 1989-05-29 | 1991-03-28 | Mitsubishi Electric Corp | Controller for suspension or stabilizer |
| JP2001320882A (en) * | 2000-05-09 | 2001-11-16 | Matsushita Electric Ind Co Ltd | Power supply apparatus, inverter and air conditioner |
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