JPH05172443A - Power supply open-phase detecting device in refrigerating plant - Google Patents

Power supply open-phase detecting device in refrigerating plant

Info

Publication number
JPH05172443A
JPH05172443A JP34103691A JP34103691A JPH05172443A JP H05172443 A JPH05172443 A JP H05172443A JP 34103691 A JP34103691 A JP 34103691A JP 34103691 A JP34103691 A JP 34103691A JP H05172443 A JPH05172443 A JP H05172443A
Authority
JP
Japan
Prior art keywords
phase
current
power supply
current value
ratio
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.)
Withdrawn
Application number
JP34103691A
Other languages
Japanese (ja)
Inventor
Mitsutoshi Sudo
光敏 須藤
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP34103691A priority Critical patent/JPH05172443A/en
Publication of JPH05172443A publication Critical patent/JPH05172443A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To reduce the number of sensor means for sensing currents flowing in each of phases of a three-phase AC power supply line and also the number of signal input ports of a controller for inputting signals from the sensor means. CONSTITUTION:Each of a sum of values of currents flowing in two phases of a three-phase AC power supply and the values of a current flowing in another phase is sensed by the first and second current sensors 1 and 2, respectively. When the ratio between these current values exceeds a predetermined range, a discrimination means 32 discriminates it as an open-phase. With such an arrangement, the number of sensor means can be reduced as compared to that of the prior art device and at the same time the number of signal input ports of the controller can be reduced and its cost can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、冷凍装置の動力源とな
る3相交流電源に適用される冷凍装置の電源欠相検出装
置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power source open phase detecting device for a refrigerating apparatus which is applied to a three-phase AC power source which is a power source for the refrigerating apparatus.

【0002】[0002]

【従来の技術】従来の冷凍装置の3相交流電源の欠相検
出においては、3相交流電源のR相、S相、T相の各線
を流れる電流値を検知するための電流センサをそれぞれ
装備し、これら電流センサによって検知された各電流値
をコントローラに入力し、各電流値が異なるか否かによ
ってコントローラが欠相の有無を判別していた。
2. Description of the Related Art In the conventional open-phase detection of a three-phase AC power supply of a refrigeration system, a current sensor for detecting a current value flowing through each line of R-phase, S-phase and T-phase of the three-phase AC power supply is provided. However, each current value detected by these current sensors is input to the controller, and the controller determines whether or not there is a phase loss depending on whether or not each current value is different.

【0003】[0003]

【発明が解決しようとする課題】上記従来の冷凍装置に
おける電源欠相検出にあっては、各相電流が流れる3線
に電流センサをそれぞれ装備するため、その整備点数が
多くなるとともに、コントローラは各電流センサからの
信号を入力するためのポート数を多く要するため、コス
トアップとなっていた。
In the power supply phase loss detection in the conventional refrigeration system described above, since the current sensors are respectively provided in the three wires through which each phase current flows, the number of maintenance points is increased and the controller is Since the number of ports for inputting the signal from each current sensor is large, the cost is increased.

【0004】本発明は上記の課題を解決しようとするも
のである。
The present invention is intended to solve the above problems.

【0005】[0005]

【課題を解決するための手段】本発明は上記課題を解決
するべく、その要旨とするところは、3相交流電源を動
力源とする冷凍装置において、上記電源の2相を流れる
電流値の和を検知するための第1の検知手段と、他の1
相を流れる電流値を検知するための第2の検知手段とを
備えると共に、上記第1の検知手段による電流値と上記
第2の検知手段による電流値との比が所定の範囲を超え
たとき欠相と判断する判別手段を備えたことを特徴とす
る電源欠相検出装置にある。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the gist of the present invention is to sum the current values flowing through the two phases of the above-mentioned power source in a refrigerating apparatus powered by a three-phase AC power source. A first detecting means for detecting
Second detection means for detecting the current value flowing through the phase, and when the ratio of the current value by the first detection means to the current value by the second detection means exceeds a predetermined range A power supply phase loss detecting device characterized in that it is provided with a determination means for determining a phase loss.

【0006】[0006]

【作用】上記において、3相交流電源の2相を流れる電
流値の和と他の1相を流れる電流値をそれぞれ第1と第
2の電流センサが検知し、この両者の電流値の比が所定
範囲を超えたときは判別手段が欠相と判別する。
In the above, the first and second current sensors detect the sum of the current values flowing in the two phases of the three-phase AC power source and the current value flowing in the other one phase, respectively, and the ratio of the current values of the two is detected. When it exceeds the predetermined range, the discriminating means discriminates that the phase is missing.

【0007】上記により、従来の装置に比べて検知手段
の数を削減することができるとともに、判別手段が設け
られたコントローラの信号入力ポートの数を削減するこ
とができ、コスト低減が可能となる。
As described above, the number of detecting means can be reduced as compared with the conventional device, and the number of signal input ports of the controller provided with the discriminating means can be reduced, so that the cost can be reduced. .

【0008】[0008]

【実施例】本発明の一実施例を図1に示す。図1に示す
本実施例は、冷凍装置10に接続された3相交流電源線
のR相及びS相の電線にまたがって設けられR相とS相
の電流値の和を検知する変流器等よりなる第1の電流セ
ンサ1、上記3相交流電源線のR,S相以外のT相の電
線に設けられT相の電流値を検知する変流器等よりなる
第2の電流センサ2、上記第1、第2の電流センサ1,
2がそれぞれ検知した電流値を入力してその比率を演算
する演算手段31、予め所定の設定値が設定され記憶す
る設定手段33、同設定手段33と上記演算手段31の
出力信号を入力し欠相の有無を判別する判別手段32を
備えている。
FIG. 1 shows an embodiment of the present invention. The present embodiment shown in FIG. 1 is a current transformer that is provided over the R-phase and S-phase electric wires of the three-phase AC power supply line connected to the refrigerating apparatus 10 and detects the sum of the current values of the R-phase and S-phase. And the like, and a second current sensor 2 including a current transformer or the like provided in the T-phase electric wire other than the R and S phases of the three-phase AC power supply line and configured to detect a T-phase current value. , The first and second current sensors 1,
2 inputs the current value detected respectively and calculates the ratio thereof, the calculating means 31, the setting means 33 for setting and storing a predetermined set value in advance, and the output signals of the setting means 33 and the calculating means 31 are inputted and missing. A discriminating means 32 for discriminating the presence or absence of phases is provided.

【0009】なお、上記演算手段31と判別手段32と
設定手段33によりコントローラ3が形成されており、
また、第1の電流センサ1が設けられる2つの相はR,
S相以外の相の組合せでもよい。
A controller 3 is formed by the arithmetic means 31, the discrimination means 32, and the setting means 33,
The two phases in which the first current sensor 1 is provided are R,
A combination of phases other than the S phase may be used.

【0010】上記において、第1の電流センサ1及び第
2の電流センサ2によりそれぞれ検知された電流値A
1、A2はコントローラ3の演算手段31に入力され、
ここで、電流値の比率P(A1/A2)が演算される。
In the above, the current value A detected by each of the first current sensor 1 and the second current sensor 2
1, A2 are input to the calculation means 31 of the controller 3,
Here, the ratio P (A1 / A2) of the current value is calculated.

【0011】この電流値の比率Pは判別手段32に入力
され、判別手段32は設定手段33に予め設定されてい
る比率範囲を入力して比較し、電流値の比率Pがこの比
率範囲にある場合は欠相無しと判別する。
The current value ratio P is input to the discriminating means 32, and the discriminating means 32 inputs and compares a preset ratio range to the setting means 33, and the current value ratio P is within this ratio range. In this case, it is determined that there is no open phase.

【0012】一方、電流値の比率Pがこの比率範囲を逸
脱したときは欠相と判別する。ここに、比率範囲は電流
値の検知精度等を考慮して例えば、1・5〜2・5に設
定される。
On the other hand, when the current value ratio P deviates from this ratio range, it is determined that the phase is open. Here, the ratio range is set to, for example, 1.5 to 2.5 in consideration of the detection accuracy of the current value and the like.

【0013】かくして、欠相がない場合には、各相の負
荷はほぼ等しく同じ大きさの電流がそれぞれ3線に流れ
るため、第1の電流センサ1及び第2の電流センサ2で
検知される電流値の比率Pは2となり比率範囲内にある
ため、判別手段32で欠相無しと判別することができ
る。
Thus, when there is no open phase, the loads of the respective phases are substantially equal, and currents of the same magnitude flow in the three wires, respectively, so that they are detected by the first current sensor 1 and the second current sensor 2. Since the ratio P of the current values is 2, which is within the ratio range, the determining unit 32 can determine that there is no open phase.

【0014】他方、欠相がある場合、例えばR相及びS
相のいずれか一方の欠相にあっては、電流値の比率Pは
1となり、また、T相の欠相にあっては電流値の比率P
は過大となってそれぞれ比率範囲を超えるため、判別手
段32で欠相有りと判別することができる。
On the other hand, when there is a missing phase, for example, R phase and S phase
The current value ratio P is 1 in any one of the open phases, and the current value ratio P is in the T phase open phase.
Are excessive and exceed the respective ratio ranges, the determination means 32 can determine that there is a phase loss.

【0015】以上のごとく、本実施例においては、第1
の電流センサ1及び第2の電流センサ2によって検知し
た電流値の比率が所定範囲にあるか否かによって欠相の
有無を判定することができるため、従来の場合と比較し
て電流センサ1,2、及びコントローラ3の信号入力ポ
ートの数をそれぞれ削減できる。
As described above, in this embodiment, the first
The presence / absence of a phase loss can be determined depending on whether or not the ratio of the current values detected by the current sensor 1 and the second current sensor 2 is within a predetermined range. 2 and the number of signal input ports of the controller 3 can be reduced.

【0016】[0016]

【発明の効果】本発明の冷凍装置の電源欠相検出装置
は、3相交流電源の2相を流れる電流値の和と他の1相
を流れる電流値をそれぞれ第1と第2の電流センサが検
知して、この両者の電流値の比が所定範囲を超えたとき
は判別手段が欠相ありと判別することによって、従来の
装置に比べて検知手段の数を削減することができるとと
もに、コントローラの信号入力ポートの数を削減するこ
とができ、コストを低減することが可能となる。
According to the present invention, there is provided a power source open phase detecting device for a refrigerating apparatus, wherein a sum of current values flowing in two phases of a three-phase AC power source and a current value flowing in another one phase are respectively detected as first and second current sensors. Is detected, and when the ratio of the two current values exceeds a predetermined range, the determining means determines that there is an open phase, and thus the number of detecting means can be reduced as compared with the conventional device. The number of signal input ports of the controller can be reduced and the cost can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る電源欠相検出装置の説
明図である。
FIG. 1 is an explanatory diagram of a power supply phase failure detection device according to an embodiment of the present invention.

【符号の説明】 1 第1の電流センサ 2 第2の電流センサ 3 コントローラ 31 演算手段 32 判別手段 33 設定手段 10 冷凍装置[Explanation of reference numerals] 1 first current sensor 2 second current sensor 3 controller 31 computing means 32 discriminating means 33 setting means 10 refrigeration system

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 3相交流電源を動力源とする冷凍装置に
おいて、上記電源の2相を流れる電流値の和を検知する
ための第1の検知手段と、他の1相を流れる電流値を検
知するための第2の検知手段とを備えると共に、上記第
1の検知手段による電流値と上記第2の検知手段による
電流値との比が所定の範囲を超えたとき欠相と判断する
判別手段を備えたことを特徴とする電源欠相検出装置。
1. A refrigeration apparatus using a three-phase AC power source as a power source, and a first detecting means for detecting a sum of current values flowing in two phases of the power source, and a current value flowing in another one phase. A second detection means for detecting, and a judgment of an open phase when the ratio of the current value by the first detection means and the current value by the second detection means exceeds a predetermined range. A power source open phase detecting device comprising means.
JP34103691A 1991-12-24 1991-12-24 Power supply open-phase detecting device in refrigerating plant Withdrawn JPH05172443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34103691A JPH05172443A (en) 1991-12-24 1991-12-24 Power supply open-phase detecting device in refrigerating plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34103691A JPH05172443A (en) 1991-12-24 1991-12-24 Power supply open-phase detecting device in refrigerating plant

Publications (1)

Publication Number Publication Date
JPH05172443A true JPH05172443A (en) 1993-07-09

Family

ID=18342640

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34103691A Withdrawn JPH05172443A (en) 1991-12-24 1991-12-24 Power supply open-phase detecting device in refrigerating plant

Country Status (1)

Country Link
JP (1) JPH05172443A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1401076A2 (en) * 2002-09-19 2004-03-24 Carrier Corporation System and method for detecting loss of phase in a compressor system
KR100618255B1 (en) * 1999-12-29 2006-09-01 두산인프라코어 주식회사 a circuit for detecting over current in a motor driver
JP2015100260A (en) * 2013-11-18 2015-05-28 エルエス産電株式会社Lsis Co.,Ltd. Apparatus and method for detecting output phase deficiency in inverter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100618255B1 (en) * 1999-12-29 2006-09-01 두산인프라코어 주식회사 a circuit for detecting over current in a motor driver
EP1401076A2 (en) * 2002-09-19 2004-03-24 Carrier Corporation System and method for detecting loss of phase in a compressor system
EP1401076A3 (en) * 2002-09-19 2007-04-04 Carrier Corporation System and method for detecting loss of phase in a compressor system
JP2015100260A (en) * 2013-11-18 2015-05-28 エルエス産電株式会社Lsis Co.,Ltd. Apparatus and method for detecting output phase deficiency in inverter
US9448265B2 (en) 2013-11-18 2016-09-20 Lsis Co., Ltd. Apparatus and method for detecting output phase deficiency in inverter

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Legal Events

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A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990311