Relay Fault setting LSIG

Описание: An ACB LSIG setting
 refers to the adjustable protection parameters on an Air Circuit Breaker's electronic trip unit, where L is Long-time (overload) protection, S is Short-time (low-level short-circuit) protection, I is Instantaneous (high-level short-circuit) protection, and G is Ground-fault (equipment ground-fault) protection. These settings define the current levels and time delays at which the breaker will trip to protect the electrical system from different fault conditions. 

Understanding Each Protection Setting

L (Long-Time Protection):

Purpose: Protects against prolonged overcurrents that can cause overheating and damage to cables and equipment. 

Setting: Typically set as a percentage of the breaker's rated current (In). 

S (Short-Time Protection):

Purpose: Provides protection against short circuits that occur relatively close to the breaker. 

Setting: Often set as a multiple of the long-time setting (Ir) with an adjustable time delay for coordination with downstream devices. 

I (Instantaneous Protection):

Purpose: Offers immediate protection against very high fault currents, like a direct short circuit. 

Setting: Usually a multiple of the breaker's full load current (In). 

G (Ground-Fault Protection):

Purpose: Detects and protects against equipment ground faults. 

Setting: An optional, adjustable setting to detect ground faults.