JPH0196734U - - Google Patents
Info
- Publication number
- JPH0196734U JPH0196734U JP19417487U JP19417487U JPH0196734U JP H0196734 U JPH0196734 U JP H0196734U JP 19417487 U JP19417487 U JP 19417487U JP 19417487 U JP19417487 U JP 19417487U JP H0196734 U JPH0196734 U JP H0196734U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- resistor
- time constant
- current
- output
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000004904 shortening Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Electronic Switches (AREA)
Description
第１図は本考案の実施例に係る電子式過電流リ
レーの要部の回路図、第２図は従来例に係る電子
式過電流リレーの要部の回路図である。
２……変流器、４……電流―電圧変換回路、６
……増幅回路、８……時定数回路、１０……比較
回路、８ａ……第１の抵抗、８ｂ……充放電コン
デンサ、８ｃ……第２の抵抗、８ｄ……時定数短
縮用スイツチ。
FIG. 1 is a circuit diagram of a main part of an electronic overcurrent relay according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a main part of an electronic overcurrent relay according to a conventional example. 2...Current transformer, 4...Current-voltage conversion circuit, 6
...Amplification circuit, 8...Time constant circuit, 10...Comparison circuit, 8a...First resistor, 8b...Charge/discharge capacitor, 8c...Second resistor, 8d...Time constant shortening switch.
Claims (1)
流を電圧に変換するとともに、変換した電圧を整
流平滑する電流―電圧変換回路と、前記電流―電
圧変換回路の出力を増幅する増幅回路と、前記増
幅回路の出力により充放電される時定数回路と、
前記時定数回路の出力が基準電圧を越えると所定
の状態信号を出力する比較回路とを含み、 前記時定数回路は、前記電流―電圧変換回路の
出力部と前記比較回路の入力部との間に直列に接
続された第１の抵抗と、その第１の抵抗の前記比
較回路の入力部側の一端と接地部との間に接続さ
れたコンデンサとからなる電子式過電流リレーに
おいて、 前記第１の抵抗の両端間には、この第１の抵抗
の抵抗値よりも小さな抵抗値を有する第２の抵抗
および前記時定数回路の時定数を短縮するときに
オンにされる時定数短縮用スイツチからなる直列
回路を並列に接続したことを特徴とする電子式過
電流リレー。[Claims for Utility Model Registration] A current transformer that detects current, a current-voltage conversion circuit that converts the output current of the current transformer into voltage, and rectifies and smoothes the converted voltage, and the current-voltage conversion circuit. an amplifier circuit that amplifies the output of the circuit; a time constant circuit that is charged and discharged by the output of the amplifier circuit;
a comparison circuit that outputs a predetermined status signal when the output of the time constant circuit exceeds a reference voltage, and the time constant circuit is connected between the output section of the current-voltage conversion circuit and the input section of the comparison circuit. an electronic overcurrent relay comprising: a first resistor connected in series with the first resistor; and a capacitor connected between one end of the first resistor on the input side of the comparison circuit and a grounding part, A second resistor having a resistance value smaller than the resistance value of the first resistor is disposed between both ends of the first resistor, and a time constant shortening switch that is turned on when shortening the time constant of the time constant circuit. An electronic overcurrent relay characterized by connecting series circuits in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19417487U JPH0196734U (en) | 1987-12-21 | 1987-12-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19417487U JPH0196734U (en) | 1987-12-21 | 1987-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0196734U true JPH0196734U (en) | 1989-06-27 |
Family
ID=31484918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19417487U Pending JPH0196734U (en) | 1987-12-21 | 1987-12-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0196734U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159517A (en) * | 1989-11-15 | 1991-07-09 | Mitsubishi Electric Corp | Overcurrent detector |
-
1987
- 1987-12-21 JP JP19417487U patent/JPH0196734U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159517A (en) * | 1989-11-15 | 1991-07-09 | Mitsubishi Electric Corp | Overcurrent detector |