太陽(yáng)能光伏發(fā)電系統(tǒng)接地的主要目的

Main purpose of grounding of solar photovoltaic power generation system

（1）將低壓電氣設(shè)備的中性點(diǎn)接地，以此來(lái)降低電氣設(shè)備的絕緣水平要求，抑制因系統(tǒng)故障接地而引起的過(guò)電壓。

(1) The neutral point of low-voltage electrical equipment is grounded to reduce the insulation level requirements of electrical equipment and suppress overvoltage caused by system fault grounding.

（2）防止用電設(shè)備由于絕緣老化、損壞引起觸電、火災(zāi)等事故。

(2) Prevent electric shock, fire and other accidents caused by aging and damage of insulation of electrical equipment.

（3）保證防雷器件在電氣設(shè)備遭受雷擊時(shí)更有效的保護(hù)設(shè)備。

(3) Ensure that lightning protection devices can protect electrical equipment more effectively when it is struck by lightning.

（4）降低系統(tǒng)的電磁干擾。

(4) Reduce the electromagnetic interference of the system.

太陽(yáng)能光伏發(fā)電系統(tǒng)的接地類(lèi)型和要求

Grounding type and requirements of solar photovoltaic power generation system

（1）防雷接地，包括避雷針(帶)、引下線、接地體等，要求接地電阻小于10Ω，并建議考慮單獨(dú)設(shè)置接地體。

(1) Lightning protection grounding, including lightning rod (strip), down lead, grounding body, etc., requires the grounding resistance to be less than 10 Ω, and it is recommended to consider setting a separate grounding body.

（2）工作接地，包括逆變器、蓄電池組的中性點(diǎn)、電壓互感器和電流互感器的二次線圈等，接地電阻小于等于4Ω。

(2) Working grounding, including the neutral point of the inverter and storage battery, the secondary coil of voltage transformer and current transformer, and the grounding resistance is less than or equal to 4 Ω.

（3）安全保護(hù)接地，包括光伏組件外框、支架，控制器、逆變器、配電柜外殼，蓄電池支架、電纜外皮、金屬穿線管外皮等，要求接地電阻小于等于4Ω。

(3) Safety protection grounding, including PV module frame, support, controller, inverter, distribution cabinet shell, battery support, cable cover, metal conduit cover, etc., requires the grounding resistance to be less than or equal to 4 Ω.

（4）光伏發(fā)電系統(tǒng)中常用的接地方法如圖所示，其中無(wú)接地就是光伏發(fā)電系統(tǒng)沒(méi)有接地裝置。

(4) The common grounding methods in the photovoltaic power generation system are shown in the figure, in which no grounding means that the photovoltaic power generation system has no grounding device.

（5）條件許可時(shí)，防雷接地系統(tǒng)應(yīng)盡量單獨(dú)設(shè)置，不與其它接地系統(tǒng)共用，并保證防雷接地系統(tǒng)的接地體與公用接地體在地下的距離保持在3m以上。

(5) When conditions permit, the lightning protection grounding system should be set separately as far as possible, not shared with other grounding systems, and the distance between the grounding body of the lightning protection grounding system and the public grounding body should be kept at more than 3m underground.

（6）系統(tǒng)接地

(6) System grounding

系統(tǒng)接地是指將光伏發(fā)電系統(tǒng)中的一路導(dǎo)線(例如光伏組串負(fù)極輸出引線)，連接到設(shè)備接地端的接地方式。系統(tǒng)接地的重要作用是當(dāng)系統(tǒng)工作正常時(shí)，它能夠穩(wěn)定電氣系統(tǒng)對(duì)地的電壓，還能在發(fā)生故障時(shí)，使過(guò)電流裝置更容易運(yùn)行。

System grounding refers to the grounding method of connecting a circuit of conductors in the photovoltaic power generation system (such as the negative output lead of the photovoltaic string) to the equipment grounding terminal. The important role of system grounding is that when the system works normally, it can stabilize the voltage of the electrical system to the ground, and also make the overcurrent device easier to operate in case of fault.

系統(tǒng)中點(diǎn)接地是指在直流輸出為三線輸出時(shí)，將中性線或中心抽頭接。

The neutral point grounding of the system refers to connecting the neutral line or center tap when the DC output is three-wire output.

地

land

當(dāng)實(shí)際施工中采用系統(tǒng)接地方式時(shí)，二線系統(tǒng)中的一根導(dǎo)線，或三線系統(tǒng)中的中性線要按照下列方法牢固接地。

When the system grounding method is adopted in the actual construction, one conductor in the two-wire system or the neutral wire in the three-wire system shall be firmly grounded according to the following methods.

①直流電路可以在光伏方陣輸出電路的任意一點(diǎn)上接地，但接地點(diǎn)要盡可能靠近光伏組件前端，在開(kāi)關(guān)、熔斷器、保護(hù)二極管等之前，以更好地保護(hù)系統(tǒng)免遭雷擊引起的電壓沖擊。

① The DC circuit can be grounded at any point of the output circuit of the PV array, but the grounding point should be as close as possible to the front end of the PV module, before the switch, fuse, protective diode, etc., to better protect the system from the voltage impact caused by lightning strikes.

②當(dāng)從組串或方陣中拆去任何一塊組件時(shí)，系統(tǒng)接地、設(shè)備接地都不應(yīng)該被切斷。

② When any component is removed from the string or square array, the system grounding and equipment grounding should not be cut off.

③直流電路的地線和設(shè)備的地線應(yīng)共用同一接地電極。如果是中性接地，要把此地線與供電設(shè)施干線的中性地線連接。直流系統(tǒng)與交流系統(tǒng)的所有地線應(yīng)該是共同的。

③ The ground wire of DC circuit and equipment shall share the same grounding electrode. If it is neutral grounding, connect this ground wire with the neutral ground wire of the power supply facility trunk line. All ground wires of DC system and AC system shall be common.

光伏發(fā)電安全運(yùn)行的主要環(huán)節(jié)，在設(shè)計(jì)、施工和運(yùn)行維護(hù)過(guò)程中都要引起足夠的重視，確保接地良好，才能確保電站安全運(yùn)行。更多相關(guān)內(nèi)容就來(lái)我們網(wǎng)站http://51lib.com.cn咨詢！

The main links of safe operation of photovoltaic power generation should be paid enough attention in the process of design, construction and operation and maintenance to ensure good grounding to ensure safe operation of the power station. Come to our website for more relevant content http://51lib.com.cn consulting service