Circuit-breaker: Difference between revisions

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{{Menu_LV_switchgear_functions_&_selection}}
{{Menu_LV_switchgear_functions_and_selection}}
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The circuit-breaker/disconnector fulfills all of the basic switchgear functions, while, by means of accessories, numerous other possibilities exist}}


{| cellpadding="1" style="border: 1px solid #8888aa; background: #f7f8ff; padding: 5px; "
As shown in {{FigureRef|H20}} the circuit-breaker/ disconnector is the only item of switchgear capable of simultaneously satisfying all the basic functions necessary in an electrical installation.
|  
 
'''Contents:'''
Moreover, it can, by means of auxiliary units, provide a wide range of other functions, for example: indication (on-off - tripped on fault); undervoltage tripping; remote control… etc. These features make a circuit-breaker/ disconnector the basic unit of switchgear for any electrical installation.
* [[Standards and description of circuit-breakers]]
 
* [[Fundamental characteristics of a circuit-breaker]]
{{tb-start|id=Tab1265|num=H20|title=Functions performed by a circuit-breaker/disconnector|cols=3}}
* [[Other characteristics of a circuit-breaker]]
{| class="wikitable"
* [[Selection of a circuit-breaker]]
|-
* [[Coordination between circuit-breakers]]
! colspan="2" | Functions
* [[Discrimination MV/LV in a consumer’s substation]]
! colspan="2" | Possible Conditions
* [[Ultra-rapid circuit breaker]]
|-
| colspan="2" | Isolation
| {{tb-square}}
|
|-
| rowspan="3" |Control
| Functional
| {{tb-square}}
|
|-
| Emergency switching
| {{tb-empty-square}}
| (With the possibility of a tripping coil for remote control)
|-
| Switching-off for mechanical maintenance
| {{tb-square}}
|
|-
| rowspan="4" | Protection
| Overload
| {{tb-square}}
|
|-
| Short-circuit
| {{tb-square}}
|
|-
| Insulation fault
| {{tb-empty-square}}
| (With differential-current relay)
|-
| Undervoltage
| {{tb-empty-square}}
| (With undervoltage-trip coil)
|-
| colspan="2" | Remote control
| {{tb-empty-square}}
| Added or incorporated
|-
| colspan="2" | Indication and measurement
| {{tb-empty-square}}
| (Generally optional with an electronic tripping device)
|}
|}


[[ru:Автоматический выключатель]]
{{Section-TOC}}
[[zh:断路器]]

Latest revision as of 09:48, 22 June 2022

The circuit-breaker/disconnector fulfills all of the basic switchgear functions, while, by means of accessories, numerous other possibilities exist

As shown in Figure H20 the circuit-breaker/ disconnector is the only item of switchgear capable of simultaneously satisfying all the basic functions necessary in an electrical installation.

Moreover, it can, by means of auxiliary units, provide a wide range of other functions, for example: indication (on-off - tripped on fault); undervoltage tripping; remote control… etc. These features make a circuit-breaker/ disconnector the basic unit of switchgear for any electrical installation.

Fig. H20 – Functions performed by a circuit-breaker/disconnector
Functions Possible Conditions
Isolation
Control Functional
Emergency switching (With the possibility of a tripping coil for remote control)
Switching-off for mechanical maintenance
Protection Overload
Short-circuit
Insulation fault (With differential-current relay)
Undervoltage (With undervoltage-trip coil)
Remote control Added or incorporated
Indication and measurement (Generally optional with an electronic tripping device)
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