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Schützkleber

English translation: contact sticking

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Schützkleber
English translation:contact sticking
Entered by: Kim Metzger

08:08 Aug 7, 2023
German to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng
German term or phrase: Schützkleber
CONTEXT
Dadurch werden Schützkleber verhindert und den Verschleiß der Schützkontakte erheblich verringert.
Schützkleber HV-UND HV-+,
Schützkleber HV‑ 1und1 Überstrom 2oder2 Hauptsicherung (600°A) durchgebrannt.
Der Schaltschütz HV+ hat einen Schützkleber und muss ersetzt werden.
sdvplatt
United Kingdom
Local time: 09:37
contact sticking
Explanation:
The most common situation in contactor failures is contact sticking and coil burning.
The reason for contact sticking; If more current is passed through the main power contacts than it can carry, the contacts will overheat after a while and the contacts may stick as a result of this warming.
https://federal.com.tr/en/what-are-the-causes-of-contact-sti...

Reasons for Contact Sticking in the Contactor
However, what will happen if the current through the contacts is more than its rated current carrying capacity? Of course, it will generate more heat that may cause the sticking of the contacts. The sticking of contacts means the contacts get welded and when the contactor is de-energized the circuit will not isolate from the supply source.  https://www.electricalvolt.com/2023/04/causes-of-contact-sti...

Dies bedeutet, dass sich das Hochvoltschütz nicht mehr öffnen lässt. Um einen solchen sogenannten Schützkleber, also einen ungewollten Schließzustand der Schaltschütze, zu erkennen, werden die Schaltschütze in der Regel überwacht.
https://patents.google.com/patent/DE102015006279A1/en

Dabei erstarrt das Material und die Kontaktbrücke kann nach Abschalten des durch die Steuerspule fließenden Steuerstromes nicht mehr geöffnet werden. Diesen Fehler bezeichnet man als Schützkleber. Die zwei Terminals des Schützes sind leitend miteinander verbunden und können nicht getrennt werden. https://www.freepatentsonline.com/DE102014200265A1.html



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Note added at 6 hrs (2023-08-07 14:16:34 GMT)
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Dadurch werden das Öffnen der Schütze beim Vorliegen einer zu hohen elektrischen Last und damit das Verkleben der Schütze verhindert.
As a result, the opening of the contactors are prevented in the presence of excessive electrical load and thus the sticking of the contactors.
https://patents.google.com/patent/DE102014200264A1/de
Selected response from:

Kim Metzger
Mexico
Local time: 02:37
Grading comment
viva Mexico
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +2contact sticking
Kim Metzger
5 +1contact stuck, stuck (contactor) contacts
Johannes Gleim


Discussion entries: 6





  

Answers


6 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
contact sticking


Explanation:
The most common situation in contactor failures is contact sticking and coil burning.
The reason for contact sticking; If more current is passed through the main power contacts than it can carry, the contacts will overheat after a while and the contacts may stick as a result of this warming.
https://federal.com.tr/en/what-are-the-causes-of-contact-sti...

Reasons for Contact Sticking in the Contactor
However, what will happen if the current through the contacts is more than its rated current carrying capacity? Of course, it will generate more heat that may cause the sticking of the contacts. The sticking of contacts means the contacts get welded and when the contactor is de-energized the circuit will not isolate from the supply source.  https://www.electricalvolt.com/2023/04/causes-of-contact-sti...

Dies bedeutet, dass sich das Hochvoltschütz nicht mehr öffnen lässt. Um einen solchen sogenannten Schützkleber, also einen ungewollten Schließzustand der Schaltschütze, zu erkennen, werden die Schaltschütze in der Regel überwacht.
https://patents.google.com/patent/DE102015006279A1/en

Dabei erstarrt das Material und die Kontaktbrücke kann nach Abschalten des durch die Steuerspule fließenden Steuerstromes nicht mehr geöffnet werden. Diesen Fehler bezeichnet man als Schützkleber. Die zwei Terminals des Schützes sind leitend miteinander verbunden und können nicht getrennt werden. https://www.freepatentsonline.com/DE102014200265A1.html



--------------------------------------------------
Note added at 6 hrs (2023-08-07 14:16:34 GMT)
--------------------------------------------------

Dadurch werden das Öffnen der Schütze beim Vorliegen einer zu hohen elektrischen Last und damit das Verkleben der Schütze verhindert.
As a result, the opening of the contactors are prevented in the presence of excessive electrical load and thus the sticking of the contactors.
https://patents.google.com/patent/DE102014200264A1/de

Kim Metzger
Mexico
Local time: 02:37
Native speaker of: Native in EnglishEnglish
PRO pts in category: 248
Grading comment
viva Mexico

Peer comments on this answer (and responses from the answerer)
agree  Lancashireman: sticky or welded contact
18 hrs
  -> Better.
agree  Cilian O'Tuama
1 day 4 hrs
Login to enter a peer comment (or grade)

4 hrs   confidence: Answerer confidence 5/5 peer agreement (net): +1
contact stuck, stuck (contactor) contacts


Explanation:
'Schützkleber' is an inaccurate term as it is not the contactor that 'sticks' but its contacts that stick, usually because they arc weld together.

Kleben n des Relais / relay sticking [frezzing]
Schütz, Schaltschütz n / contactor (IEC)
(Budig, Fachwörterbuch Elektrotechnik und Elektronik)

Area Switchgear, controlgear and fuses / Switching devices
IEV ref 441-14-33
en

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Note added at 1 Tag 10 Stunden (2023-08-08 18:10:04 GMT)
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A short circuit occurs when the phase wire touched to neutral wire. In this condition, enormous current flows through the contacts, and if the protection devices do not trip the circuit in a timely manner, the huge current may cause contact sticking or contact welding.
https://www.morssmitt.com/solutions/relay-solutions/relays-s...

What are the causes of contact sticking and coil burning in the contactors?
The reason for contact sticking; If more current is passed through the main power contacts than it can carry, the contacts will overheat after a while and the contacts may stick as a result of this warming. Switching at high current, short circuit, or error in star-delta transition can cause this.
During the short duration current peak, material transfer takes place by moving ions from the anode to the cathode.
See picture below.
This material transfer creates a pip on the cathode and a crater on the anode.
When the pip and crater are sufficiently big, contact sticking can occur because of the extreme rough contact surfaces.
https://federal.com.tr/en/what-are-the-causes-of-contact-sti...

Reasons for Contact Sticking in the Contactor
1. Short Circuit …
A short circuit occurs when the phase wire touched to neutral wire. In this condition, enormous current flows through the contacts, and if the protection devices do not trip the circuit in a timely manner, the huge current may cause contact sticking or contact welding.
2. Wrong Selection of Contactor: …
You all know, that motor draws about 6-7 times the current of its rated full load current(FLC). If we use an AC-1 contactor for motor application then its contacts are apt to stick because it can not carry this huge starting current.
https://www.electricalvolt.com/2023/04/causes-of-contact-sti...

Problem #1:
The contactor is stuck in the closed position.
This can happen if the contacts are welded together due to high amperage melting the contacts together.

Problem #2
High electrical resistance is measured across the contacts when closed.
This can result due to pitting on the actual contacts. This is caused by arcing and partial melting at the contact face. This melting causes the contacts not to touch properly when the contacts are supposed to be in the closed position.

Problem #3
Ants, other insect, and cobwebs inside the contractor
Some ants such as the Red Tawny Ant are attracted to the electricity at the contactor. Because of this, they could get stuck between the contacts. … When the switch tries to close, it cannot because the contacts are not able to touch.
https://www.acservicetech.com/post/top-5-hvac-contactor-trou...

Why Electrical Contacts Stick
Electrical contacts may stick when they open and close. Small sparks known as "arcs" can corrode the metal and contribute to sticking. Cleaning electrical contacts to reduce sticking is an option. Eventually, electrical contacts need to be replaced.
https://www.repcoinc.com/about/blog/Why-Electrical-Contacts-...

Auxiliary contacts
Example circuit to realize stuck detection:
In case the contactor is stuck, the Aux COM and Aux NO wires will be short, hence the circuit is closed and the LED will be on. The AUX COM and AUX NC wires will be have the opposite way: the LED will be off when the contactor is stuck
https://www.tdk-electronics.tdk.com/inf/100/ds/HVC200A_24S.p...
https://www.texim-europe.com/Cmsfile/Stuck_Detection_Explana...

• 1 million nominal switching cycles
• Contact stuck detection available
https://www.mouser.de/new/tdk/epcos-high-voltage-contactors/...

So the star contactor could have stuck during the transition to delta causing a short circuit and it welded the links of all the three contactor that was in use during star delta transition.
https://www.eng-tips.com/viewthread.cfm?qid=380026

Johannes Gleim
Local time: 10:37
Specializes in field
Native speaker of: German
PRO pts in category: 449

Peer comments on this answer (and responses from the answerer)
agree  Zoi Patrinou
1 day 3 hrs
  -> Thank you!
Login to enter a peer comment (or grade)



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