JPH02206377A - Motor protective device - Google Patents
Motor protective deviceInfo
- Publication number
- JPH02206377A JPH02206377A JP1024356A JP2435689A JPH02206377A JP H02206377 A JPH02206377 A JP H02206377A JP 1024356 A JP1024356 A JP 1024356A JP 2435689 A JP2435689 A JP 2435689A JP H02206377 A JPH02206377 A JP H02206377A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- neutral point
- motor
- phase
- 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
- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (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
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はＹ−Δ始動される電動機のＹ結線時の中性点
側回路における短絡を検出できる電動機保護装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motor protection device capable of detecting a short circuit in a neutral point side circuit when a Y-connected motor is started in a Y-Δ manner.
第２図は従来のＹ−Δ始動される電動機の三線結線図で
ある。図において、（１）は三相交流電源、＋２１ 、
１３１ 、 ＋４１は回路開閉器、（５１はＹ−△始動
される電動機、（６１は過電流検出装置である。FIG. 2 is a three-line diagram of a conventional Y-Δ starting electric motor. In the figure, (1) is a three-phase AC power supply, +21,
131, +41 is a circuit breaker, (51 is a motor to be started by Y-Δ, (61 is an overcurrent detection device).
次に動作について説明する。Ｙ−Δ始動される電動機（
５）の起動は回路開閉器（３）を開き、回路開閉器＋２
＋、（４１を閉じることによってＹ結線で行なわれ、起
動後、回路開閉器（４）を開き回路開閉器（３１を閉じ
てΔ結線で運転される。そして、電動機（５）の内部及
び過電流検出装置（６）と電動機（５１の間での短絡事
故は過電流検出装置（６）で検出され、回路開閉器（２
）を開くなど回路を開いて電動機（５）を停止させる等
の保護処置が行なわれる。Next, the operation will be explained. Y-Δ The electric motor being started (
To start 5), open the circuit breaker (3) and switch the circuit breaker +2.
+, (41 is closed to perform a Y connection. After startup, the circuit breaker (4) is opened and the circuit breaker (31 is closed to operate in a Δ connection. Then, the inside of the motor (5) and the A short circuit accident between the current detection device (6) and the motor (51) is detected by the overcurrent detection device (6), and the circuit breaker (2
) to open the circuit and stop the motor (5).
従来の回路は以上のように構成されているので回路開閉
器（３）が開、回路開閉器＋２１ 、 ＋４）が閉のＹ
結線時に電動機（５１と回路開閉器（４）の間で短絡等
の事故が発生した場合、過電流検出装置（６）でに検出
されず、回路開閉器（３）が閉となってΔ結線となった
時はじめて過電流が過電流検出装置（６）で検出される
ため、電動機がある程度回転してからの異常検出となり
、大きな事故電流が流れるなど十分な保護が出来ないと
いう課題があった。The conventional circuit is configured as described above, so the circuit breaker (3) is open and the circuit breakers +21 and +4) are closed.
If an accident such as a short circuit occurs between the motor (51) and the circuit breaker (4) during wiring, it will not be detected by the overcurrent detection device (6) and the circuit breaker (3) will close, resulting in a delta connection. Since the overcurrent is detected by the overcurrent detection device (6) only when this occurs, an abnormality is detected only after the motor has rotated to a certain extent, resulting in problems such as large fault currents flowing and insufficient protection. .
この発明は上記のような課題を解決するためになされた
もので、回路開閉器（３）が開、回路開閉器＋２１ 、
＋４１が閉のＹ結線時の電動機（５）と回路開閉器（
４）の間の中性点回路での短絡事故でも検出できる電動
機保護装置を得ることを目的とする。This invention was made to solve the above-mentioned problems, and the circuit breaker (3) is open, the circuit breaker +21
Motor (5) and circuit breaker (when +41 is closed in Y connection)
4) It is an object of the present invention to obtain a motor protection device that can detect even a short-circuit accident in the neutral point circuit between 4) and 4).
この発明に係る電動機保護装置は、三相Ｙ−Δ始動され
る電動機の入力側゛成流會検出する入力電流検出器、上
記電動機のＹ結線時の中性点側各相の電流を検出する中
性点電流検出器、この中性点電流検出器で検出された中
性点側各相の電流と上記入力”酸流検出器で検出された
入力側電流とにより上記電動機のＹＶｉｍ時の中性点回
路の短絡を検出する短絡検出装置を設けたものである。The motor protection device according to the present invention includes an input current detector that detects the current flow on the input side of a three-phase Y-Δ motor that is started, and an input current detector that detects the current of each phase on the neutral point side when the motor is Y-connected. A neutral point current detector, the current of each phase on the neutral point side detected by this neutral point current detector and the input side current detected by the above input acid flow detector determines the inside of the above motor during YVim. A short circuit detection device is provided to detect a short circuit in the sex point circuit.
この発明における短絡検出装置は、中性点電流検出器で
検出された中性点側各相の電流と、入力電流検出器で検
出された入力側電流とにより、三相Ｙ−Δ始動される電
動機のＹ結線時の中性点回路の短絡を検出する。The short circuit detection device according to the present invention is started by three-phase Y-Δ by the current of each phase on the neutral point side detected by the neutral point current detector and the input side current detected by the input current detector. Detects a short circuit in the neutral point circuit when the motor is Y-connected.
以下、この発明の一実施例を図について説明する。第１
図において、Ｉｌｌは三相交流＊ｍ、（２Ｉ 、 ［３
＋ 。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, Ill is three-phase AC*m, (2I, [3
＋.
（４）は回路開閉器、（６）は三相Ｙ−Δ始動される電
動機、（６）は過電流検出装置、（Ｉｌｌは電動＠（５
）の入力回路の電流を検出する変流器、０２）は電動機
（６１のＹ結線時の中性点近傍の各相電流を検出する変
流器、關は入力回路の電流と中性点回路の電流を比較す
ることにより中性点回路の短絡を検出する短絡検出装置
である。(4) is a circuit breaker, (6) is a three-phase Y-Δ electric motor, (6) is an overcurrent detection device, (Ill is electric @ (5
) is a current transformer that detects the current in the input circuit of the motor (61), and 02) is a current transformer that detects the current of each phase near the neutral point when Y-connected the motor (61). This is a short circuit detection device that detects short circuits in the neutral point circuit by comparing the currents of the two.
次に動作について説明する。Next, the operation will be explained.
変流器（Ｉ２１からσ）中性点側各相の電流及び変流器
（ＩＩ）からの電動機（５）の入力回路の１相の電流を
中性点回路短絡検出装置０３１に入力する。例えば、中
性点回路で３相短絡が発生すると短絡した３相の短絡点
から中性点側には電流が流れず、電動機人力には電流が
流れる。中性点回路で２相短絡が発生すると、短絡点か
ら中性点側に流れる電流は短絡した２相の電流の和と健
全相の電流と絶対１直は等しくなる。すなわち、３相短
絡及び２相短絡いずれにおいても中性点側の１相以上の
電流が入力電流より小さくなる。The current of each phase on the neutral point side of the current transformers (I21 to σ) and the current of one phase of the input circuit of the motor (5) from the current transformer (II) are input to the neutral point circuit short circuit detection device 031. For example, when a three-phase short circuit occurs in a neutral point circuit, no current flows from the short circuit point of the shorted three phases to the neutral point, but current flows to the manual power of the electric motor. When a two-phase short circuit occurs in the neutral point circuit, the current flowing from the short circuit point to the neutral point side is equal to the sum of the currents of the short-circuited two phases, the current of the healthy phase, and absolute one. That is, in both a three-phase short circuit and a two-phase short circuit, the current in one or more phases on the neutral point side becomes smaller than the input current.
中性点回路短絡検出装ｆｔ０３１は、このことに着目し
中性点回路各相の電流と電動機入力回路の電流全比軟し
、中性点回路の各相電流のうち１相以上が電動機入力回
路の電流より小さいことにより、中性点回路で短絡が発
生したことを検出する。中性点回路での短絡が検出さ扛
ると轟然の事ではあるが電動＠（５）を停止させる等の
保護処置がとられる。Focusing on this, the neutral point circuit short circuit detection device ft031 softens the total ratio of the current of each phase of the neutral point circuit to the current of the motor input circuit, and detects that one or more of the phase currents of the neutral point circuit is input to the motor. It is detected that a short circuit has occurred in the neutral point circuit because the current is smaller than the current in the circuit. If a short circuit in the neutral point circuit is detected, protective measures such as stopping the electric motor (5) will be taken, although it may be surprising.
なお、電流の比較はＳ／Ｗ （ソフトウェア）で行なっ
ても、Ｈ／Ｗ （ハードウェア）で行なっても同様の効
果を奏する。Note that the same effect can be obtained whether the current comparison is performed by S/W (software) or H/W (hardware).
また、中性点回路の短絡の検出は中性点側電流のみによ
っても、例えば三相分全比較したり、始動時の電流の立
上りを見ることなどの方法で可能ではあるが、上記実施
例のように入力側電流と比較することで、より簡単に確
実に短絡の検出ができる。In addition, it is possible to detect a short circuit in the neutral point circuit using only the neutral point side current, for example by comparing all three phases or by observing the rise of the current at the time of starting. A short circuit can be detected more easily and reliably by comparing it with the input side current as shown in the figure below.
以上のようにこの発明によれば、電動機保護装置を、三
相Ｙ−△始動される電動機の入力側車流を検出する入力
゛電流検出器、上記電動機のＹ結線時の中性点側各相の
電流を検出する中性点電流検出器、この中性点電流検出
器で検出された中性点側各相の電流と上記入力電流検出
器で検出された入力側？「流とにより上記電動機のＹ結
線時の中性点回路の短絡を検出する短絡検出装置を備え
るように構成したので、三相Ｙ−Δ始動されるｉＪＬｗ
Ｊ機のＹ結線時に中性点回路でσ）短絡事故が検出でき
るものが得られる効果がある。As described above, according to the present invention, the motor protection device includes a three-phase Y-△ input current detector for detecting the input side vehicle flow of the motor to be started, and each phase on the neutral point side when the motor is Y-connected. A neutral point current detector that detects the current of , the current of each phase on the neutral point side detected by this neutral point current detector and the input side detected by the above input current detector? ``Since the structure is equipped with a short circuit detection device that detects a short circuit in the neutral point circuit when the motor is Y-connected due to current, the iJLw
This has the effect of making it possible to detect σ) short-circuit accidents in the neutral point circuit when the J machine is connected in a Y manner.
第１図はこの発明の一実施例による三相Ｙ−△始動され
る電動機の概略結線を示す結線図、第２図は従来の三相
Ｙ−△始動される電動機の概略結線を示す結線図である
。
図において、（１）は三相交流電源、＋２１ 、 ＋３
１ 、 ＋４１は回路開閉器、（５１は電動機、（６１
は過電流検出装置、（Ｉｌｌ 、 ＋１２１は変流器、
α３１は短絡検出装置である。
なお、
図中、
同一符号は同一、
又は相当部分を
示す。Fig. 1 is a wiring diagram showing a schematic connection of a three-phase Y-△-started motor according to an embodiment of the present invention, and Fig. 2 is a wiring diagram showing a schematic connection of a conventional three-phase Y-△-started motor. It is. In the figure, (1) is a three-phase AC power supply, +21, +3
1, +41 is a circuit breaker, (51 is an electric motor, (61
is an overcurrent detection device, (Ill, +121 is a current transformer,
α31 is a short circuit detection device. In addition, the same symbols in the figures indicate the same or equivalent parts.
Claims (1)
力電流検出器、上記電動機のＹ結線時の中性点側各相の
電流を検出する中性点電流検出器、この中性点電流検出
器で検出された中性点側各相の電流と上記入力電流検出
器で検出された入力側電流とにより上記電動機のＹ結線
時の中性点回路の短絡を検出する短絡検出装置を備えた
電動機保護装置。An input current detector that detects the input current of a three-phase Y-Δ motor that is started, a neutral point current detector that detects the current of each phase on the neutral point side when the motor is Y-connected, and this neutral point. A short circuit detection device detects a short circuit in the neutral point circuit when the motor is Y-connected using the current of each phase on the neutral point side detected by the current detector and the input side current detected by the input current detector. Equipped with motor protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024356A JPH02206377A (en) | 1989-02-01 | 1989-02-01 | Motor protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024356A JPH02206377A (en) | 1989-02-01 | 1989-02-01 | Motor protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02206377A true JPH02206377A (en) | 1990-08-16 |
Family
ID=12135915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1024356A Pending JPH02206377A (en) | 1989-02-01 | 1989-02-01 | Motor protective device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02206377A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008228513A (en) * | 2007-03-15 | 2008-09-25 | Mitsubishi Electric Corp | Electric motor drive device, electric motor drive method, and refrigeration air conditioner |
-
1989
- 1989-02-01 JP JP1024356A patent/JPH02206377A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008228513A (en) * | 2007-03-15 | 2008-09-25 | Mitsubishi Electric Corp | Electric motor drive device, electric motor drive method, and refrigeration air conditioner |
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