The Gas-fired power plant unit is generally composed of engine, generator, unit integrated control system, oil circuit system and power distribution system. The differences in parameters and performance between high-voltage generator sets and low-voltage generator sets are mainly reflected in the generator part and distribution system part. The power part of the generator set in the communication system - the engine or gas turbine engine - is basically the same for high-pressure and low-pressure units; The configuration and fuel volume of the oil system are mainly related to power, so there is no significant difference between high and low pressure units, so there is no difference in the requirements for the air intake and exhaust systems of the units that provide cooling.

高壓發(fā)電機組一般要求裝設電流速斷保護、過負荷保護、接地保護等。當電流速斷保護的靈敏性不符合要求時，可裝設縱聯(lián)差動保護。高壓發(fā)電機組在運行中發(fā)生接地故障時，對人身和設備產(chǎn)生很大的安全隱患，因此需要設置接地故障保護。

High voltage generator sets generally require the installation of current quick break protection, overload protection, grounding protection, etc. When the sensitivity of current quick break protection does not meet the requirements, longitudinal differential protection can be installed. When a grounding fault occurs in the operation of a high-voltage generator set, it poses a significant safety hazard to personnel and equipment, so it is necessary to set up grounding fault protection.

發(fā)電機中性點通過電阻接地，當發(fā)生單相接地故障時，可檢測到流經(jīng)中性點的故障電流，通過繼電保護實現(xiàn)跳閘或停機保護。發(fā)電機中性點通過電阻接地，可將故障電流限制在發(fā)電機允許的損壞曲線內(nèi)，發(fā)電機可帶故障運行。通過接地電阻，可有效地檢測到接地故障，驅(qū)動繼電保護動作。高壓發(fā)電機組與低壓機組相比需增加電阻柜、接觸器柜等中性點配電設備。

The neutral point of the generator is grounded through a resistor. When a single-phase grounding fault occurs, the fault current flowing through the neutral point can be detected, and tripping or shutdown protection can be achieved through relay protection. The neutral point of the generator is grounded through a resistor, which can limit the fault current within the allowable damage curve of the generator, and the generator can operate with faults. Through grounding resistance, grounding faults can be effectively detected and relay protection actions can be driven. Compared to low-voltage units, high-voltage generator sets require the addition of neutral point distribution equipment such as resistance cabinets and contactor cabinets.

燃氣氣發(fā)電機組必要時需設置差動保護。在發(fā)電機的定子繞組上提供三相的電流差動保護。當任意兩相發(fā)相或三生短路或接地時，均能在兩個互感器內(nèi)檢測到故障電流，從而驅(qū)動保護。通過安裝在發(fā)電機每組線圈兩個出線端的電流互感器，測量線圈進出線端的電流差值，以此來判斷線圈絕緣情況。

If necessary, differential protection should be installed for gas turbine generator sets. Provide three-phase current differential protection on the stator winding of the generator. When any two phases are short circuited or grounded, the fault current can be detected in both transformers, thereby driving the protection. By installing current transformers at the two outgoing terminals of each coil in the generator, the current difference between the incoming and outgoing terminals of the coil is measured to determine the insulation condition of the coil.