JPS6226996Y2 - - Google Patents
Info
- Publication number
- JPS6226996Y2 JPS6226996Y2 JP14590383U JP14590383U JPS6226996Y2 JP S6226996 Y2 JPS6226996 Y2 JP S6226996Y2 JP 14590383 U JP14590383 U JP 14590383U JP 14590383 U JP14590383 U JP 14590383U JP S6226996 Y2 JPS6226996 Y2 JP S6226996Y2
- Authority
- JP
- Japan
- Prior art keywords
- current
- current transformer
- motor
- overcurrent
- relay
- 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.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は、電動機の起動時及び運転時の保護協
調を確実にした過電流保護継電装置に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an overcurrent protection relay device that ensures protection coordination during startup and operation of a motor.
過電流継電器を用いた電動機保護においては過
電流継電器の誘導円板要素の動作時間はタイムダ
イヤルの設定値によつて決まるので一度設定すれ
ば電動機の始動時及び運転時共過電流継電器の動
作時間は変らなく一定である。しかしながら始動
電流が電動機の過電流耐量に近い場合には過電流
継電器の動作特性を始動時と運転時に変えないと
電動機の保護が完全に行なえない。その様な場合
の保護協調例を第１図に示す。
When protecting a motor using an overcurrent relay, the operating time of the induction disk element of the overcurrent relay is determined by the setting value of the time dial, so once the setting is made, the operating time of the overcurrent relay will be the same at both the start and operation of the motor. remains constant. However, if the starting current is close to the overcurrent withstand capacity of the motor, the motor cannot be completely protected unless the operating characteristics of the overcurrent relay are changed during starting and during operation. Figure 1 shows an example of protection coordination in such a case.
第１図の曲線Ａは電動機の始動時及び運転時の
電流変化を示し、I2は始動突入電流、I1は定格電
流、T1は始動時間である。曲線Ｂは過電流継電
器の動作特性を示す。曲線Ｃは電動機の過電流耐
量を示す。 Curve A in FIG. 1 shows the current change during starting and operation of the motor, where I 2 is the starting inrush current, I 1 is the rated current, and T 1 is the starting time. Curve B shows the operating characteristics of the overcurrent relay. Curve C shows the overcurrent withstand capacity of the motor.
始動電流が電動機の過電流耐量に近い場合は、
第１図の如く保護継電器の動作曲線Ｂを始動電流
曲線Ａと過電流耐量曲線Ｃの間に入れることが困
難な場合がある。 If the starting current is close to the overcurrent capacity of the motor,
As shown in FIG. 1, it may be difficult to place the operating curve B of the protective relay between the starting current curve A and the overcurrent capability curve C.
本考案の目的は、始動電流が電動機の過電流耐
量に近く保護継電器の動作曲線が始動電流と交わ
る場合においても電動機の始動時の誤動作を防止
し、また運転時の保護を可能にした電動機の過電
流保護継電装置を提供することにある。
The purpose of this invention is to prevent malfunctions when starting the motor even when the starting current is close to the overcurrent withstand capacity of the motor and the operating curve of the protective relay intersects the starting current, and to protect the motor during operation. An object of the present invention is to provide an overcurrent protection relay device.
本考案による電動機の過電流保護継電装置は、
電動機の主回路電流を取り出す主変流器と、この
主変流器の２次電流をより小さな値に変流する補
助変流器と、この補助変流器の２次電流を入力す
べく設けられた過電流継電器と、前記電動機の始
動に伴つて附勢され所定の始動時間経過後前記過
電流継電器に前記主変流器の２次電流を導入させ
るタイマー回路とを備え電動機の始動時のみ、補
助変流器の２次電流を過電流継電器に導入して、
始動電流による誤動作を確実に防止する保護協調
特性を持つものである。
The motor overcurrent protection relay device according to the present invention is
A main current transformer that takes out the main circuit current of the motor, an auxiliary current transformer that transforms the secondary current of this main current transformer to a smaller value, and a main current transformer that is installed to input the secondary current of this auxiliary current transformer. and a timer circuit that is energized when the motor starts and causes the secondary current of the main current transformer to be introduced into the overcurrent relay after a predetermined starting time has elapsed, only when the motor is started. , by introducing the secondary current of the auxiliary current transformer into the overcurrent relay,
It has protective coordination characteristics that reliably prevent malfunctions caused by starting current.
以下本考案を図面に示す一実施例を参照して説
明する。
The present invention will be described below with reference to an embodiment shown in the drawings.
第２図は本考案装置を適用する一般的な系統図
であり電動機１１は母線１２にしや断器１３を介
して接続している。そして上記しや断器１３の開
閉により運転及び停止動作するしや断器１３から
電動機１１への電路には主変流器１４を設け、そ
の２次回路には過電流保護継電装置１５を接続す
る。この過電流保護装置１５は、通常の誘導形過
電流継電器１６及び主変流器１４の２次電流をさ
らに小さな値に変流する補助変流器１７と、この
補助変流器１７を短絡するための接点Ｘ−ａによ
り概略構成される。 FIG. 2 is a general system diagram to which the device of the present invention is applied, and an electric motor 11 is connected to a bus bar 12 via a sheath disconnector 13. A main current transformer 14 is installed in the electrical path from the shield breaker 13, which is operated and stopped by opening and closing of the shield breaker 13, to the motor 11, and an overcurrent protection relay device 15 is installed in its secondary circuit. Connecting. This overcurrent protection device 15 short-circuits a normal inductive overcurrent relay 16 and an auxiliary current transformer 17 that transforms the secondary current of the main current transformer 14 to a smaller value. It is roughly constituted by a contact point X-a.
第３図は本考案に用いるタイマー回路を示す。
PNは制御電源１３−ａは前記しや断器１３の補
助ａ接点で、しや断器１３の投入に伴い閉成す
る。この接点１３−ａは動作ロツク用タイマーＴ
を介して電源Ｐ，Ｎ間に接続され、補助リレーＸ
のａ接点Ｘ−ａは前述の如く、短絡用の接点とし
て用いる。しや断器１３のトリツプコイル１３Ｔ
は前記過電流継電器１６の出力部１６ａを介して
電源Ｐ，Ｎ間に接続する。 FIG. 3 shows a timer circuit used in the present invention.
The control power source 13-a of PN is an auxiliary a contact of the shield breaker 13, and is closed when the shield breaker 13 is turned on. This contact 13-a is the operation lock timer T.
is connected between the power supplies P and N via the auxiliary relay
The a contact X-a is used as a short-circuit contact as described above. Trip coil 13T of shield breaker 13
is connected between the power supplies P and N via the output section 16a of the overcurrent relay 16.
次に第４図で示す、本考案による協調例を示す
保護協調特性を参照して作用を説明する。第２図
のしや断器１３を投入し電動機１１を始動すると
主変流器１４を介して２次回路に始動電流I2が流
れる。さらにこの始動電流I2を変流する補助変流
器１７る介して過電流継電器１６に流入する始動
電流I3を過電流継電器１６の動作曲線Ｄにかさな
らないようにする。曲線Ｄは過電流継電器１６に
流入する電流変化を示す。補助変流器１７の変流
タツプの選定基準としては始動電流I2と過負荷耐
量曲線Ｃの時間差をT3とし、また本考案にて過
電流継電器１６に流入する始動電流I3と過電流継
電器動作曲線Ｂとの時間差をT2とするとT2≦T3
となるよう変流タツプを選定する。従つて始動時
の過電流継電器１６に流入する電流I3は補助変流
器の変流比分だけ電流が小さくなり、過電流継電
器１６は動作しない。また電動機始動時間T1以
上に第３図のタイマーＴを整定しておくことによ
り、始動時間後その接点Ｔ−ａがオンし補助リレ
ーＸの短絡用接点Ｘ−ａがオンし第２図で示す補
助変流器１７を短絡することで過電流継電器に流
入する電流は定格電流I1となる。このようにして
過電流継電器１６の動作電流を始動時には補助変
流器１７を介すことでおさえ、運転時には定格電
流を流入するようにした。 Next, the operation will be explained with reference to the protection cooperation characteristics shown in FIG. 4, which shows an example of cooperation according to the present invention. When the breaker 13 shown in FIG. 2 is turned on and the motor 11 is started, a starting current I 2 flows through the main current transformer 14 to the secondary circuit. Further, the starting current I 3 flowing into the overcurrent relay 16 via the auxiliary current transformer 17 that transforms this starting current I 2 is made not to exceed the operating curve D of the overcurrent relay 16 . Curve D shows the change in current flowing into the overcurrent relay 16. The criteria for selecting the current transformer tap of the auxiliary current transformer 17 is the time difference between the starting current I 2 and the overload capability curve C, and in this invention, the starting current I 3 flowing into the overcurrent relay 16 and the overcurrent If the time difference with relay operating curve B is T 2 , then T 2 ≦T 3
Select the current change tap so that Therefore, the current I3 flowing into the overcurrent relay 16 at the time of starting becomes smaller by the current transformation ratio of the auxiliary current transformer, and the overcurrent relay 16 does not operate. In addition, by setting the timer T in Fig. 3 to a time greater than the motor starting time T 1 , the contact T-a is turned on after the starting time, and the short-circuit contact X-a of the auxiliary relay X is turned on, as shown in Fig. 2. By short-circuiting the auxiliary current transformer 17 shown, the current flowing into the overcurrent relay becomes the rated current I1 . In this way, the operating current of the overcurrent relay 16 is suppressed through the auxiliary current transformer 17 during startup, and the rated current flows during operation.
以上のように本考案によれば、始動電流が過電
流耐量曲線に近い場合においても補助変流器にて
過電流継電器に流入する電流をおさえ、運転時に
は主変流器の２次電流を過電流継電器１６に導入
させることで電動機の保護が行なえる。
As described above, according to the present invention, even when the starting current is close to the overcurrent withstand curve, the auxiliary current transformer suppresses the current flowing into the overcurrent relay, and during operation, the secondary current of the main current transformer is suppressed. By introducing the current into the current relay 16, the motor can be protected.
第１図は従来の保護協調特性を示す特性図、第
２図は本考案による電動機の過電流保護継電装置
の一実施例を示す系統図、第３図は本考案に用い
るタイマー回路の構成例を示す回路図、第４図は
本考案装置による保護協調特性を示す特性図であ
る。
１１……電動機、１４……主変流器、１６……
過電流継電器、１７……補助変流器、Ｘ……補助
継電器、Ｔ……タイマー。
Fig. 1 is a characteristic diagram showing conventional protection coordination characteristics, Fig. 2 is a system diagram showing an embodiment of the overcurrent protection relay device for a motor according to the present invention, and Fig. 3 is the configuration of a timer circuit used in the present invention. FIG. 4 is a circuit diagram showing an example, and is a characteristic diagram showing protection cooperation characteristics by the device of the present invention. 11...Electric motor, 14...Main current transformer, 16...
Overcurrent relay, 17... Auxiliary current transformer, X... Auxiliary relay, T... Timer.
Claims (1)
の主変流器の２次電流をより小さな値に変流する
補助変流器と、この補助変流器の２次電流を入力
すべく設けられた過電流継電器と、前記電動機の
始動に伴つて附勢され所定の始動時間経過後前記
過電流継電器に前記主変流器の２次電流を導入さ
せるタイマー回路とを備えた電動機の過電流保護
継電装置。 A main current transformer that takes out the main circuit current of the motor, an auxiliary current transformer that transforms the secondary current of this main current transformer to a smaller value, and a main current transformer that is installed to input the secondary current of this auxiliary current transformer. and a timer circuit that is energized when the motor starts and causes the overcurrent relay to introduce the secondary current of the main current transformer after a predetermined starting time has elapsed. Protective relay device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14590383U JPS6055239U (en) | 1983-09-22 | 1983-09-22 | Motor overcurrent protection relay device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14590383U JPS6055239U (en) | 1983-09-22 | 1983-09-22 | Motor overcurrent protection relay device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6055239U JPS6055239U (en) | 1985-04-18 |
| JPS6226996Y2 true JPS6226996Y2 (en) | 1987-07-10 |
Family
ID=30324931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14590383U Granted JPS6055239U (en) | 1983-09-22 | 1983-09-22 | Motor overcurrent protection relay device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055239U (en) |
-
1983
- 1983-09-22 JP JP14590383U patent/JPS6055239U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6055239U (en) | 1985-04-18 |
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