Types of Relays Used in Air Circuit Breaker (ACB)
- shunt coil relay
- Under Voltage (UV) Relay
- closing relay
Elektrik, elektronik dan pelbagai perkara berkaitan teknikal sudah menjadi minatku sejak dari kecil lagi. Disini pelbagai alrtikel, litar dan seumpamanya berkaitan teknikal akan dikongsi bersama, tak kiralah, litar, projek dan pelbagai bahan lagi akan menjadi nota dan rujukan. Mungkin ia tak berguna hari ini, esok belum tentu... apa saja berkaitannya yang dirasakan boleh dikongsi, akan dimasukkan kedalamnya... Semoga bermanfaat.
Iu
Rated uninterrupted current (Iu) The rated uninterrupted current of an equipment is a value of current, stated by the manufacturer, which the equipment can carry in uninterrupted duty.
KA rating
kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. If the current goes beyond this value, the circuit breaker could be damaged. kA rating is known as the short circuit withstand capacity or ultimate breaking capacity of a circuit breaker
Icu
unlimited break Capacity of the circuit breaker Which means the circuit breaker can break the maximum fault current without damage. Typically for MCB the maximum Icu will be 6KA to 10 KA for MCCB Icu may be 200kAmps.
Ice
Ics is the amount of current that the circuit breaker can safely withstand without being damaged for example 6 kA or 6000 A and remain usable. Icn is the amount of current the circuit-breaker can safely handle but would not remain usable.
Ue
Rated working voltage (Ue) is the continuous operation voltage for which the MCCB is designed. This value is typically equivalent or close to a standard system voltage. Operating short-circuit breaking capacity (Ics) is the highest fault current that the MCCB can trip without being damaged permanently.
Ui
Rated insulation voltage (Ui)
This is the value of voltage to which the dielectric tests voltage (generally greater than 2 Ui) and creepage distances are referred to. The maximum value of rated operational voltage must never exceed that of the rated insulation voltage,
Uimp
Rated impulse-withstand voltage (Uimp)
This characteristic expresses, in kV peak (of a prescribed form and polarity) the value of voltage which the equipment is capable of withstanding without failure, under test conditions. Generally, for industrial circuit-breakers, Uimp = 8 kV and for domestic types, Uimp = 6 kV.
No
|
category
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certificate
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classification
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Low Voltage System (Below 1000V)
| |||
1
|
AO
|
PJ1
|
Low Voltage System (Without Aerial Line and Power Station)
|
2
|
A1
|
PJ2
|
Low Voltage System (Without Power Station)
|
3
|
A4-2
|
PJ32
|
Low Voltage System (Without Aerial Line and Synchronizing of Generators)
|
4
|
A4-1
|
PJ3
|
Low Voltage System (Without Synchronizing of Generators)
|
5
|
A4
|
PJ4
|
Low Voltage System
|
High Voltage System ( 11kV or 33kV)
| |||
6
|
BO-2
|
PJ52
|
High Voltage System (Without High Voltage Aerial Line and High Voltage Power Station; and Without Low Voltage Aerial Line and Low Voltage Synchronizing of Generators)
|
7
|
BO-1
|
PJ5
|
High Voltage System (Without High Voltage Aerial Line and High Voltage Power Station; and Without Low Voltage Synchronizing of Generators)
|
8
|
BO
|
PJ6
|
High Voltage System (Without High Voltage Aerial Line and High Voltage Power Station)
|
9
|
B1
|
PJ7
|
High Voltage System (Without High Voltage Power Station)
|
10
|
B4
|
PJ8
|
High Voltage System
|