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(jī)組一般要求裝設(shè)電流速斷保護(hù)、過(guò)負(fù)荷保護(hù)、接地保護(hù)等。當(dāng)電流速斷保護(hù)的靈敏性不符合要求時(shí)，可裝設(shè)縱聯(lián)差動(dòng)保護(hù)。高壓發(fā)電機(jī)組在運(yùn)行中發(fā)生接地故障時(shí)，對(duì)人身和設(shè)備產(chǎn)生很大的安全隱患，因此需要設(shè)置接地故障保護(hù)。

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(jī)中性點(diǎn)通過(guò)電阻接地，當(dāng)發(fā)生單相接地故障時(shí)，可檢測(cè)到流經(jīng)中性點(diǎn)的故障電流，通過(guò)繼電保護(hù)實(shí)現(xiàn)跳閘或停機(jī)保護(hù)。發(fā)電機(jī)中性點(diǎn)通過(guò)電阻接地，可將故障電流限制在發(fā)電機(jī)允許的損壞曲線內(nèi)，發(fā)電機(jī)可帶故障運(yùn)行。通過(guò)接地電阻，可有效地檢測(cè)到接地故障，驅(qū)動(dòng)繼電保護(hù)動(dòng)作。高壓發(fā)電機(jī)組與低壓機(jī)組相比需增加電阻柜、接觸器柜等中性點(diǎn)配電設(shè)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?xì)鈿獍l(fā)電機(jī)組必要時(shí)需設(shè)置差動(dòng)保護(hù)。在發(fā)電機(jī)的定子繞組上提供三相的電流差動(dòng)保護(hù)。當(dāng)任意兩相發(fā)相或三生短路或接地時(shí)，均能在兩個(gè)互感器內(nèi)檢測(cè)到故障電流，從而驅(qū)動(dòng)保護(hù)。通過(guò)安裝在發(fā)電機(jī)每組線圈兩個(gè)出線端的電流互感器，測(cè)量線圈進(jìn)出線端的電流差值，以此來(lái)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.