JP2003088135A - Surge absorber switching circuit of inverter motor - Google Patents

Surge absorber switching circuit of inverter motor

Info

Publication number
JP2003088135A
JP2003088135A JP2001272892A JP2001272892A JP2003088135A JP 2003088135 A JP2003088135 A JP 2003088135A JP 2001272892 A JP2001272892 A JP 2001272892A JP 2001272892 A JP2001272892 A JP 2001272892A JP 2003088135 A JP2003088135 A JP 2003088135A
Authority
JP
Japan
Prior art keywords
inverter motor
surge absorber
inverter
lightning
motor
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
Application number
JP2001272892A
Other languages
Japanese (ja)
Inventor
Takeshi Suzuki
鈴木  剛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsurumi Manufacturing Co Ltd
Original Assignee
Tsurumi Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tsurumi Manufacturing Co Ltd filed Critical Tsurumi Manufacturing Co Ltd
Priority to JP2001272892A priority Critical patent/JP2003088135A/en
Publication of JP2003088135A publication Critical patent/JP2003088135A/en
Pending legal-status Critical Current

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  • Inverter Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a surge absorber switching circuit which can easily and accurately perform measurement for insulation as the daily check of an hydraulic pump using an inverter motor. SOLUTION: Lightning-arresters 4a for normal mode are respectively inserted among each phase of AC 3-phase as a surge absorber protection circuit 2 between an inverter input and a converter 3 of the inverter motor 1. Lightning- arresters 4b for common mode are respectively provided between the 3-phase and an earth line 5. Moreover, a normal-open type electromagnetic switch 7 which requires power source from the main power supply of the inverter motor 1 is provided between the lightning-arrester 4b for common mode and the earth line 5.

Description

【発明の詳細な説明】 【0001】 【発明の技術分野】本発明は、インバータとモ−タを一
体化したいわゆるインバータモータ、特に水中ポンプ用
インバータモータの絶縁測定用として有効な、インバー
タモータのサージアブソーバ開閉回路に関するものであ
る。 【0002】 【従来技術とその問題点】インバータには雷などのサー
ジ電圧から保護するため図2に示すよう、入力部にサー
ジアブソーバ等の保護回路20を設けるのが通例であ
る。この保護回路20は通常、各電源入力ライン各相間
および電源ライン80とアースライン50間に接続して
あり、サージ電圧印加されると過電圧をサージ電流とし
てアース側に流し、インバータ内部を保護するのであ
る。そして一般的な水中ポンプの日常点検の一つにモー
タの絶縁測定がある。これはメガテスタを用いて、モー
タおよびケーブルの絶縁状態を確認するものである。 【0003】しかし図2のような回路構成のインバータ
モータ10では、DC500Vメガテスタにより通常行
うようなポンプケーブル先端までの絶縁測定を実施した
場合、保護回路20がメガテスタからの印加電圧に対し
ても動作して、測定部に対し規定電圧が印加されないた
め正確に測定できないことがある。従って、このような
従来のインバータモータの絶縁抵抗値を正確に測定する
ためには、インバータモータ10を一旦分解し、インバ
ータ10aおよびモータ10bのそれぞれについて測定
を行うか、または保護回路20部分を取り外した態様に
おいて測定するかの何れかの方法がとられることにな
る。 【0004】 【発明の目的】本発明の目的は、インバータモータを用
いた水中ポンプ等の日常点検として絶縁測定が簡単かつ
正確に行うことのできる、サージアブソーバ開閉回路を
提供することにある。 【0005】 【発明の構成】本発明に係るインバータモータのサージ
アブソーバ開閉回路では、インバータモータのインバー
タ入力部とコンバータの間にサージアブソーバ保護回路
として、交流3相の各相間にそれぞれノーマルモード用
の耐雷素子を挿入し、上記3相とアースラインの間には
それぞれコモンモード用の耐雷素子を挿入し、かつ、イ
ンバータモータの主電源を電源とするノーマルオープン
型の電磁スイッチを前記コモンモード用耐雷素子とアー
スラインの間に介装させた。 【0006】 【作用】インバータモータへの電源電圧が印加されてい
ない状態では、電磁スイッチは接点開であるからサージ
アブソーバ保護回路はアースラインから外れた状態とな
り、サージアブソーバ保護回路によるDC500Vメガ
テスタでの絶縁抵抗測定への影響は無くなる。そしてイ
ンバータモータへの電源電圧が印加されると、電磁スイ
ッチが接点閉となってサージアブソーバ保護回路はアー
スラインに繋がり、サージ電圧保護が可能となる。 【0007】 【実施例】実施例の図1において、1はインバータ1a
とモータ1bを一体化したインバータモータ、2はイン
バータ1aの入力部とコンバータ3の間に接続されたサ
ージアブソーバ保護回路、4a・・4aは交流3相の各
相間にそれぞれ挿入されたノーマルモード用耐雷素子、
4b・・4bは交流3相とアース端子6の間に挿入され
たコモンモード用耐雷素子、7はアース端子6とアース
ライン5との間に介装されたノーマルオープン型の電磁
スイッチである。 【0008】電磁スイッチ7の電磁コイルへの電源はイ
ンバータモータ1の主電源から取る。これによりインバ
ータモータ1への電源電圧が印加されていない状態で
は、電磁スイッチ7は接点開であるからサージアブソー
バ保護回路2はアースライン5から外れた状態となり、
サージアブソーバ保護回路2によるDC500Vメガテ
スタでの絶縁抵抗測定への影響は無くなる。そしてイン
バータモータ1への電源電圧が印加されると、電磁スイ
ッチ7は接点閉となってサージアブソーバ保護回路2は
アースライン5に繋がり、サージ電圧保護が可能とな
る。ここで問題となるのが、インバータモータ1への電
源電圧が印加されていない状態では、電源ライン8とア
ースライン5が接続されておらず、コモンモードに対す
るサージ電圧保護が懸念されることである。しかしこれ
に関しては後述の理由により問題はない。 【0009】インバータモータ1へかかるサージ電圧と
して主に考えられるのは、電源開閉時におけるスイッチ
ングサージと落雷による誘導雷サージである。電源開閉
時のサージとは、インバータモータ1への電源供給スイ
ッチ、例えば電磁接触器やブレーカなどから電源を印加
した瞬間に発生するスイッチングサージであり、これは
各相間に挿入しているノーマルモード用耐雷素子4a・
・4a等の保護素子により保護される。絶縁抵抗測定
は、アース端子6と各相間の絶縁状態を測定するもので
あるから、これについては何ら影響を生じるものではな
い。一方の落雷による誘導雷サージについては、電源ラ
インから印加される場合と、操作盤と負荷との間のケー
ブルに直接誘導し印加するというケースが考えられる
が、水中ポンプ用のインバータモータとして考えた場
合、後者のケースは極めて稀であり、実際的には前者の
電源ラインから印加されるケースが問題となる。即ち、
電源入力ラインにおいて、電磁接触器やブレーカ等で電
源が遮断されている状態では雷サージ経路は絶たれるた
め問題はなく、また電源供給ラインが繋がっている状態
では保護回路が機能することになる。 【0010】 【発明の効果】本発明サージアブソーバ開閉回路によれ
ば、インバータモータを用いた水中ポンプ等の日常点検
としての絶縁測定が簡単かつ正確に行われるという利点
がある。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called inverter motor in which an inverter and a motor are integrated, and more particularly to an inverter motor which is effective for measuring insulation of a submersible pump inverter motor. The present invention relates to a surge absorber switching circuit. 2. Description of the Related Art Generally, an inverter is provided with a protection circuit 20 such as a surge absorber at an input portion as shown in FIG. 2 in order to protect the inverter from surge voltage such as lightning. This protection circuit 20 is normally connected between each power supply input line and each phase and between the power supply line 80 and the ground line 50. When a surge voltage is applied, an overvoltage flows as a surge current to the ground side to protect the inside of the inverter. is there. One of the daily inspections of general submersible pumps is motor insulation measurement. This is to check the insulation state of the motor and the cable using a megatester. However, in the inverter motor 10 having a circuit configuration as shown in FIG. 2, when the insulation measurement up to the tip of the pump cable is normally performed by a DC 500 V megatester, the protection circuit 20 operates even with an applied voltage from the megatester. As a result, accurate measurement may not be possible because the specified voltage is not applied to the measuring unit. Therefore, in order to accurately measure the insulation resistance value of such a conventional inverter motor, the inverter motor 10 is once disassembled and measurement is performed on each of the inverter 10a and the motor 10b, or the protection circuit 20 is removed. In any of the embodiments described above, any of the methods will be used. SUMMARY OF THE INVENTION It is an object of the present invention to provide a surge absorber switching circuit capable of easily and accurately performing insulation measurement as a daily inspection of a submersible pump or the like using an inverter motor. In a surge absorber switching circuit for an inverter motor according to the present invention, a surge absorber protection circuit is provided between an inverter input section of the inverter motor and a converter, and a normal mode mode is provided between each of three AC phases. A lightning proof element is inserted between the three phases and the ground line, and a normally open type electromagnetic switch powered by a main power supply of an inverter motor is connected between the three phases and the ground line. It was interposed between the element and the earth line. In the state where the power supply voltage is not applied to the inverter motor, the contact point of the electromagnetic switch is open, so that the surge absorber protection circuit is disconnected from the ground line. There is no influence on insulation resistance measurement. When a power supply voltage is applied to the inverter motor, the electromagnetic switch is closed and the surge absorber protection circuit is connected to the ground line, thereby enabling surge voltage protection. In FIG. 1 of the embodiment, reference numeral 1 denotes an inverter 1a.
And motor 1b are integrated, an inverter motor 2 is a surge absorber protection circuit connected between the input section of the inverter 1a and the converter 3, and 4a... 4a are for a normal mode inserted between each of three phases of AC. Lightning proof element,
4b denotes a common mode lightning proof element inserted between the three alternating current phases and the earth terminal 6, and 7 denotes a normally open electromagnetic switch interposed between the earth terminal 6 and the earth line 5. Power for the electromagnetic coil of the electromagnetic switch 7 is obtained from the main power supply of the inverter motor 1. As a result, when the power supply voltage is not applied to the inverter motor 1, the contact of the electromagnetic switch 7 is open, so that the surge absorber protection circuit 2 is disconnected from the ground line 5,
The effect of the surge absorber protection circuit 2 on the insulation resistance measurement with a DC 500 V megatester is eliminated. When the power supply voltage is applied to the inverter motor 1, the electromagnetic switch 7 is closed and the surge absorber protection circuit 2 is connected to the ground line 5, so that surge voltage protection is possible. The problem here is that when the power supply voltage is not applied to the inverter motor 1, the power supply line 8 and the ground line 5 are not connected, and there is a concern about surge voltage protection for common mode. . However, there is no problem with this for the reasons described below. [0009] The surge voltage applied to the inverter motor 1 is mainly considered to be a switching surge at the time of opening and closing the power supply and an induced lightning surge due to a lightning strike. The power supply switching surge is a switching surge generated at the moment when power is applied from a power supply switch to the inverter motor 1, for example, an electromagnetic contactor or a breaker, and is used for a normal mode inserted between each phase. Lightning protection element 4a
・ Protected by a protection element such as 4a. Since the insulation resistance measurement is to measure the insulation state between the earth terminal 6 and each phase, there is no effect on this. On the other hand, the lightning surge induced by a lightning strike may be applied from the power supply line or applied directly to the cable between the operation panel and the load, but it was considered as an inverter motor for a submersible pump. In the latter case, the latter case is extremely rare. In practice, the former case is applied from the power supply line. That is,
In the power input line, when the power is cut off by an electromagnetic contactor, a breaker, or the like, the lightning surge path is cut off, so that there is no problem. When the power supply line is connected, the protection circuit functions. According to the surge absorber opening / closing circuit of the present invention, there is an advantage that insulation measurement as a daily inspection of a submersible pump or the like using an inverter motor can be performed simply and accurately.

【図面の簡単な説明】 【図1】 本発明におけるインバータモータのサージア
ブソーバの開閉回路図である。 【図2】 従来におけるインバータモータのサージアブ
ソーバの回路図である。 【符号の説明】 1 インバータモータ 1a インバータ 1b モータ 2 サージアブソーバ保護回路 3 コンバータ 4a ノーマルモード用耐雷素子 4b コモンモード用耐雷素子 5 アースライン 7 ノーマルオープン型の電磁スイッチ
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a switching circuit diagram of a surge absorber of an inverter motor according to the present invention. FIG. 2 is a circuit diagram of a conventional inverter motor surge absorber. [Description of Signs] 1 Inverter motor 1a Inverter 1b Motor 2 Surge absorber protection circuit 3 Converter 4a Normal mode lightning proof element 4b Common mode lightning proof element 5 Earth line 7 Normally open electromagnetic switch

Claims (1)

【特許請求の範囲】 【請求項1】 インバータモータのインバータ入力部と
コンバータの間にサージアブソーバ保護回路として、交
流3相の各相間にそれぞれノーマルモード用の耐雷素子
を挿入し、上記3相とアースラインの間にはそれぞれコ
モンモード用の耐雷素子を挿入し、かつ、インバータモ
ータの主電源を電源とするノーマルオープン型の電磁ス
イッチを前記コモンモード用耐雷素子とアースラインの
間に介装させたことを特徴とする、インバータモータの
サージアブソーバ開閉回路。
Claims: 1. A lightning proof element for a normal mode is inserted between each of three phases of alternating current as a surge absorber protection circuit between an inverter input part of an inverter motor and a converter. A common mode lightning proof element for each common mode is inserted between the ground lines, and a normally open electromagnetic switch powered by the main power supply of the inverter motor is interposed between the common mode lightning proof element and the ground line. A surge absorber switching circuit for an inverter motor.
JP2001272892A 2001-09-10 2001-09-10 Surge absorber switching circuit of inverter motor Pending JP2003088135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001272892A JP2003088135A (en) 2001-09-10 2001-09-10 Surge absorber switching circuit of inverter motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001272892A JP2003088135A (en) 2001-09-10 2001-09-10 Surge absorber switching circuit of inverter motor

Publications (1)

Publication Number Publication Date
JP2003088135A true JP2003088135A (en) 2003-03-20

Family

ID=19098189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001272892A Pending JP2003088135A (en) 2001-09-10 2001-09-10 Surge absorber switching circuit of inverter motor

Country Status (1)

Country Link
JP (1) JP2003088135A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009254217A (en) * 2008-04-11 2009-10-29 Wellness:Kk Electric device, power connection device and method for grounding electric device
JP2012178968A (en) * 2011-01-31 2012-09-13 Kyocera Corp Solar power generation system
JP2013539350A (en) * 2010-10-06 2013-10-17 アルストム テクノロジー リミテッド Method and apparatus for protecting ESP power supply from transient overvoltage in power grid
CN111316554A (en) * 2018-09-27 2020-06-19 富士电机株式会社 Power conversion device
CN113872172A (en) * 2020-06-30 2021-12-31 Abb瑞士股份有限公司 Device for overvoltage protection of subsea electrical equipment and method for operating the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06144737A (en) * 1992-11-06 1994-05-24 Hitachi Ltd Control device of elevator
JPH06319293A (en) * 1993-03-12 1994-11-15 Toshiba Corp Safety device for air conditioner
JPH08338391A (en) * 1995-06-09 1996-12-24 Ebara Corp Driving control device of inverter motor pump
JPH11107975A (en) * 1997-10-03 1999-04-20 Hitachi Ltd Submerged motor driven pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06144737A (en) * 1992-11-06 1994-05-24 Hitachi Ltd Control device of elevator
JPH06319293A (en) * 1993-03-12 1994-11-15 Toshiba Corp Safety device for air conditioner
JPH08338391A (en) * 1995-06-09 1996-12-24 Ebara Corp Driving control device of inverter motor pump
JPH11107975A (en) * 1997-10-03 1999-04-20 Hitachi Ltd Submerged motor driven pump

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009254217A (en) * 2008-04-11 2009-10-29 Wellness:Kk Electric device, power connection device and method for grounding electric device
JP2013539350A (en) * 2010-10-06 2013-10-17 アルストム テクノロジー リミテッド Method and apparatus for protecting ESP power supply from transient overvoltage in power grid
US9899831B2 (en) 2010-10-06 2018-02-20 General Electric Technology Gmbh Method and device to protect an ESP power supply from transient over-voltages on the power grid
JP2012178968A (en) * 2011-01-31 2012-09-13 Kyocera Corp Solar power generation system
CN111316554A (en) * 2018-09-27 2020-06-19 富士电机株式会社 Power conversion device
CN111316554B (en) * 2018-09-27 2023-09-22 富士电机株式会社 Power conversion device
CN113872172A (en) * 2020-06-30 2021-12-31 Abb瑞士股份有限公司 Device for overvoltage protection of subsea electrical equipment and method for operating the same
EP3934043A1 (en) * 2020-06-30 2022-01-05 ABB Schweiz AG Arrangement for overvoltage protection of subsea electrical apparatus
US11705274B2 (en) 2020-06-30 2023-07-18 Abb Schweiz Ag Arrangement for overvoltage protection of subsea electrical apparatus
CN113872172B (en) * 2020-06-30 2024-03-26 Abb瑞士股份有限公司 Device for overvoltage protection of subsea electrical equipment and method for operating the same

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