Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

1.Definition and Function1.1 Role of the Generator Circuit BreakerThe Generator Circuit Breaker (GCB) is a controllable disconnect point located between the generator and the step-up transformer, serving as an interface between the generator and the power grid. Its primary functions include isolating generator-side faults and enabling operational control during generator synchronization and grid connection. The operating principle of a GCB is not significantly different from that of a standard c

1. High-Resistance Grounding SystemHigh-resistance grounding can limit ground fault current and appropriately reduce ground overvoltage. However, there is no need to connect a large high-value resistor directly between the generator neutral point and ground. Instead, a small resistor can be used together with a grounding transformer. The primary winding of the grounding transformer is connected between the neutral point and ground, while the secondary winding is connected to a small resistor. Ac

1.Introduction1.1 Basic Function and Background of GCBThe Generator Circuit Breaker (GCB), as the critical node connecting the generator to the step-up transformer, is responsible for interrupting current under both normal and fault conditions. Unlike conventional substation circuit breakers, the GCB directly withstands the massive short-circuit current from the generator, with rated short-circuit breaking currents reaching hundreds of kiloamperes. In large generating units, the reliable operati

The generator circuit breaker is a critical component in power systems, and its reliability directly affects the stable operation of the entire power system. Through research and practical application of intelligent monitoring systems, the real-time operational status of circuit breakers can be monitored, enabling early detection of potential faults and risks, thereby enhancing the overall reliability of the power system.Traditional circuit breaker maintenance primarily relies on periodic inspec

1.Protects the GeneratorWhen asymmetric short circuits occur at the generator outlet or the unit bears unbalanced loads, the GCB can quickly isolate the fault to prevent generator damage. During unbalanced load operation, or internal/external asymmetric short circuits, twice the power frequency eddy current is induced on the rotor surface, causing additional heating in the rotor. Meanwhile, the alternating electromagnetic torque at twice the power frequency induces double-frequency vibration in

In industrial production, emergency rescue, commercial buildings, and other scenarios, silent-canopy diesel generator sets serve as the “core backup” for stable power supply. The quality of on-site installation directly determines the unit’s operational efficiency, noise control performance, and service life; even minor oversights may lead to potential faults. Today, based on practical experience, we outline the complete standardized procedures and critical details for on-site installation of si

Units with a capacity of 300MW and above are usually connected in a generator-transformer unit configuration and connected to the power system through the circuit breaker on the high-voltage side of the transformer. During the normal operation of the unit, the circuit breaker may trip automatically due to various reasons. Operators must make correct judgments and take timely measures to ensure the safe operation of the unit.1. Causes of Automatic Circuit Breaker Tripping Tripping due to relay pr

Recently, a Chinese generator circuit breaker manufacturer has successfully developed generator circuit breakers for 1,000MW hydropower and thermal power units, which have passed the group's appraisal and acceptance. Their comprehensive performance has reached the international leading level, filling the domestic gap. This is another major breakthrough following the group's mastery of the technology for large-capacity generator circuit breaker complete sets for 400MW, 600MW, and 800MW units, mar

The working principle of a power plant boiler is to utilize the thermal energy released from fuel combustion to heat feedwater, producing a sufficient quantity of superheated steam that meets specified parameters and quality requirements. The amount of steam produced is known as the boiler's evaporation capacity, typically measured in tons per hour (t/h). Steam parameters primarily refer to pressure and temperature, expressed in megapascals (MPa) and degrees Celsius (°C), respectively. Steam qua

Why Do Electrical Equipment Need a "Bath"?Due to atmospheric pollution, contaminants accumulate on insulating porcelain insulators and posts. During rain, this can lead to pollution flashover, which in severe cases may cause insulation breakdown, resulting in short circuits or grounding faults. Therefore, the insulating parts of substation equipment must be periodically washed with water to prevent flashover and avoid insulation degradation that could lead to equipment failure.Which Equipment Is