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praca niepełnofazowa

English translation: open-phase or off-phase operation

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Polish term or phrase:praca niepełnofazowa
English translation:open-phase or off-phase operation
Entered by: Frank Szmulowicz, Ph. D.

13:09 Dec 20, 2014
Polish to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng / silnik elektryczny
Polish term or phrase: praca niepełnofazowa
Zabezpieczenie silników elektrycznych niskiego napięcia od pracy niepełnofazowej
clairee
Local time: 00:40
open-phase or off-phase operation
Explanation:
The utility model is part of a three-phase asynchronous motor off phase protection

The utility model discloses an open-phase protector for a three phase asynchronous motor, adopting a three phase bridge linkage circuit device which comprises a rectifying element, an electrolytic capacitor and a direct current relay by routine connections. When any phase of the three phase power supply cord is cut off, the utility model of the open-phase protector can cut off a power supply rapidly in 0.3-0.5 seconds, so that the purpose of protecting a motor from being burnt out can be obtained. The open-phase protector has simple line and low cost, being applicable for countryside.

As you know, three-phase asynchronous motor burned for many reasons, but off-phase operation is one of the important reasons for motor overheating damaged.

otor overload and phase operation for effective protection has become an urgent problem to be solved, people have done a lot of work in this area, only the off-phase motor running protection program has a variety of differential thermal relay, general three phase thermal relays, full thermal protection and thermistor temperature relay, transistor-phase protection, etc., see the "Low Voltage" 1977 page 10, 3.

http://www.google.com/patents/CN85205451U?cl=en


ccccccccccccccccccccccccccc

The operation resulting from an open motor power line or a motor that was originally supposed to operate with three-phase voltage, but is currently operating with single-phase voltage because of loose connections, faulty control switch connection, or an open wire in the motor is called open-phase operation.

motor will not start with a single-phase voltage. Therefore the overload element described earlier can be used to detect this condition and prevent the motor from burning up. Should an open-phase condition occur during normal operation and result in single-phase operation, however, the three-phase inductive motor will continue to operate as a singlephase inductive motor if the load is light enough. Refer to Fig. 3. The three possible conditions are a power-supply open phase in a starconnected motor, a power-supply open phase in a delta-connected motor, and an internal delta open phase. Let's see whether we can prevent the motor from burning up here simply by inserting an overload element in the power supply line.
1.Open-phase in a Star-connected Motor

http://www.ia.omron.com/support/guide/65/overview.html
Selected response from:

Frank Szmulowicz, Ph. D.
United States
Local time: 18:40
Grading comment
thx!
4 KudoZ points were awarded for this answer



Summary of answers provided
3 +1missing phase operation
Jacek Kloskowski
3open-phase or off-phase operation
Frank Szmulowicz, Ph. D.


Discussion entries: 6





  

Answers


6 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +1
missing phase operation


Explanation:
Prócz wyżej wymienionych zabezpieczeń stosuje się również przekaźnik zaniku fazy. Niepełnofazowa praca silnika jest możliwa, ale wywoła asymetrię prądów wirnika i stojana prowadząc do takich samych uszkodzeń jak przy przeciążeniu.

http://www.elektroinstalacje.info/articles.php?article_id=6

Jacek Kloskowski
United States
Local time: 18:40
Native speaker of: Native in PolishPolish, Native in EnglishEnglish
PRO pts in category: 4

Peer comments on this answer (and responses from the answerer)
agree  George BuLah (X): I think, it's better to describe shortly as it has been done here
6 days
Login to enter a peer comment (or grade)

6 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
open-phase or off-phase operation


Explanation:
The utility model is part of a three-phase asynchronous motor off phase protection

The utility model discloses an open-phase protector for a three phase asynchronous motor, adopting a three phase bridge linkage circuit device which comprises a rectifying element, an electrolytic capacitor and a direct current relay by routine connections. When any phase of the three phase power supply cord is cut off, the utility model of the open-phase protector can cut off a power supply rapidly in 0.3-0.5 seconds, so that the purpose of protecting a motor from being burnt out can be obtained. The open-phase protector has simple line and low cost, being applicable for countryside.

As you know, three-phase asynchronous motor burned for many reasons, but off-phase operation is one of the important reasons for motor overheating damaged.

otor overload and phase operation for effective protection has become an urgent problem to be solved, people have done a lot of work in this area, only the off-phase motor running protection program has a variety of differential thermal relay, general three phase thermal relays, full thermal protection and thermistor temperature relay, transistor-phase protection, etc., see the "Low Voltage" 1977 page 10, 3.

http://www.google.com/patents/CN85205451U?cl=en


ccccccccccccccccccccccccccc

The operation resulting from an open motor power line or a motor that was originally supposed to operate with three-phase voltage, but is currently operating with single-phase voltage because of loose connections, faulty control switch connection, or an open wire in the motor is called open-phase operation.

motor will not start with a single-phase voltage. Therefore the overload element described earlier can be used to detect this condition and prevent the motor from burning up. Should an open-phase condition occur during normal operation and result in single-phase operation, however, the three-phase inductive motor will continue to operate as a singlephase inductive motor if the load is light enough. Refer to Fig. 3. The three possible conditions are a power-supply open phase in a starconnected motor, a power-supply open phase in a delta-connected motor, and an internal delta open phase. Let's see whether we can prevent the motor from burning up here simply by inserting an overload element in the power supply line.
1.Open-phase in a Star-connected Motor

http://www.ia.omron.com/support/guide/65/overview.html

Frank Szmulowicz, Ph. D.
United States
Local time: 18:40
Specializes in field
Native speaker of: Native in EnglishEnglish, Native in PolishPolish
PRO pts in category: 200
Grading comment
thx!
Login to enter a peer comment (or grade)



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