JPS58143432U - motor protection relay - Google Patents
motor protection relayInfo
- Publication number
- JPS58143432U JPS58143432U JP3931682U JP3931682U JPS58143432U JP S58143432 U JPS58143432 U JP S58143432U JP 3931682 U JP3931682 U JP 3931682U JP 3931682 U JP3931682 U JP 3931682U JP S58143432 U JPS58143432 U JP S58143432U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- phase
- signal
- motor
- unbalance rate
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第1図は従来のモータ保護リレーの構成を示すブロック
図、第2図は本考案に係るモータ保護リレーの構成を示
すブロック図である。
各図中同一部材には同一符号を付し、10は変流器、1
2は過電流検出回路、14は不平衡率判定回路、14a
は起動待不平衡率判定回路、i4bは運転時不平衡率判
定回路、16は反相検出回路、20はリレー回路、32
は起動検出回路、24は起動時間設定器、22.34は
アンド回路、30は電源電圧検出回路、18.28はオ
ア回路、26はノット回路である。FIG. 1 is a block diagram showing the structure of a conventional motor protection relay, and FIG. 2 is a block diagram showing the structure of a motor protection relay according to the present invention. Identical members in each figure are given the same reference numerals; 10 is a current transformer; 1 is a current transformer;
2 is an overcurrent detection circuit; 14 is an unbalance rate determination circuit; 14a
is a start-up unbalance rate determination circuit, i4b is an operation unbalance rate determination circuit, 16 is an antiphase detection circuit, 20 is a relay circuit, 32
24 is a startup detection circuit, 24 is a startup time setter, 22.34 is an AND circuit, 30 is a power supply voltage detection circuit, 18.28 is an OR circuit, and 26 is a NOT circuit.
Claims (3)
、前記負荷電流が設定基準値を越えたときに過電流信号
を出力する過電流検出回路と、前記負荷電流の不平衡率
を演算し該不平衡率が設定基準値を越えたときに不平衡
信号を出力する不平衡率判定回路と、モータ接続の正相
或いは反相状態を判別しモータが反相接続されていると
きに反相信号を出力する反相検出回路と、前記過電流信
号と不平衡信号と反相信号とのうち少くともいずれか1
つの信号が出力されたときに主回路を開放するリレー回
路と、を含むモータ保護リレーにおいて、前記不平衡率
判定回路はモータ起動時には不平衡率の設定基準値が高
く設定されモータ起動後所定時間経過後は設定基準値が
低く設定される回路から成り、また反相検出回路はモー
タ主回路の電源電圧を分析してモータの反相接続を検出
する構成から成り該反相検出回路にはモータ起動後所定
時間経過後にリレー回路への反相信号の出力を阻止する
反相信号停止装置が設けられることを特徴とするモータ
保護リレー。(1) A current transformer that detects the load current of the three-phase motor main circuit, an overcurrent detection circuit that outputs an overcurrent signal when the load current exceeds a set reference value, and an unbalance rate of the load current. an unbalance rate determination circuit that calculates the unbalance rate and outputs an unbalance signal when the unbalance rate exceeds a set reference value; and an unbalance rate determination circuit that determines whether the motor is connected in positive phase or in reverse phase and when the motor is connected in reverse phase. an anti-phase detection circuit that outputs an anti-phase signal to the overcurrent signal, an unbalanced signal, and an anti-phase signal;
a relay circuit that opens the main circuit when one signal is output; The anti-phase detection circuit consists of a circuit that sets the set reference value low after the elapse of time, and the anti-phase detection circuit consists of a circuit that analyzes the power supply voltage of the motor main circuit to detect anti-phase connection of the motor. A motor protection relay characterized in that it is provided with an anti-phase signal stop device that prevents output of an anti-phase signal to a relay circuit after a predetermined period of time has elapsed after activation.
リレーにおいて、不平衡率判定回路は設定基準値が高く
設定された起動時不平衡率判定回路と設定基準値が低く
設定された運転時不平衡率判定回路とから成り、モータ
起動時は負荷電流の −不平衡率を起動時不平衡率
判定回路によって判定し起動後所定時間経過後は運転時
不平衡率判定回路によってそれぞれ判定することを特徴
とするモータ保護リレー。(2) Utility Model Registration Scope of Claim (1) In the motor protection relay described in claim (1), the unbalance rate determination circuit includes a start-up unbalance rate determination circuit with a high set standard value and an operation time with a low set standard value. When starting the motor, the -unbalance rate of the load current is determined by the starting unbalance rate determining circuit, and after a predetermined time has elapsed after startup, the running unbalance rate determining circuit determines the -unbalance rate of the load current. A motor protection relay characterized by:
のモータ保護リレーにおいて、反相信号停止装置はモー
タの起動を検出しモータ起動後所定時間起動検出信号を
出力する起動検出回路と、前記起動検出信号と反相信号
とが共に出力されたときのみ反相信号を出力するアンド
回路とから成ることを特徴とするモータ保護リレー。(3) In the motor protection relay described in utility model registration claim (1) or (2), the anti-phase signal stop device includes a start detection circuit that detects the start of the motor and outputs a start detection signal for a predetermined period of time after the motor starts. and an AND circuit that outputs an anti-phase signal only when the start detection signal and the anti-phase signal are both output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3931682U JPS58143432U (en) | 1982-03-19 | 1982-03-19 | motor protection relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3931682U JPS58143432U (en) | 1982-03-19 | 1982-03-19 | motor protection relay |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58143432U true JPS58143432U (en) | 1983-09-27 |
Family
ID=30050606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3931682U Pending JPS58143432U (en) | 1982-03-19 | 1982-03-19 | motor protection relay |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58143432U (en) |
-
1982
- 1982-03-19 JP JP3931682U patent/JPS58143432U/en active Pending
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