設(shè)備功率負(fù)荷計(jì)算公式

1、精心整理專設(shè)備功率確定負(fù)荷計(jì)算公式一、計(jì)算設(shè)備功率的確定進(jìn)行負(fù)荷計(jì)算時(shí)，需將用電設(shè)備按其性質(zhì)分為不同的用電設(shè)備組，然后確定設(shè)備功率。用電設(shè)備的額定功率Pr或額定容量Sr是指銘牌上的數(shù)據(jù)。對(duì)于不同負(fù)載持續(xù)率下的額定功率或額定容量，應(yīng)換算為統(tǒng)一負(fù)載持續(xù)率下的有功功率，即設(shè)備功率 Pn。(1)連續(xù)工作制電動(dòng)機(jī)的設(shè)備功率等于額定功率。(2)短時(shí)或周期工作制電動(dòng)機(jī)(如起重機(jī)用電動(dòng)機(jī)等)的設(shè)備功率是指將額定功率換算為統(tǒng)一負(fù)載持續(xù)率下的有功功率。當(dāng)采用需要系數(shù)法和二項(xiàng)式法計(jì)算負(fù)荷時(shí)，應(yīng)統(tǒng)一換算到負(fù)載持續(xù)率e為25%下的有功功率。Pn = PrJ- = 2Pr 嘉，kW( 5-2-1).0.25當(dāng)采用利用系數(shù)

2、法計(jì)算負(fù)荷時(shí)，應(yīng)統(tǒng)一換算到負(fù)載持續(xù)率e為100%下的有功功率。Pn =P3(5-2-2)式中Pr 電動(dòng)機(jī)額定功率,kW ；r 電動(dòng)機(jī)額定負(fù)載持續(xù)率。(3)電焊機(jī)的設(shè)備功率是將額定容量換算到負(fù)載持續(xù)率&為100%時(shí)的有功功率。PN = SrcosQkW(5-2-3)式中Sr電焊機(jī)的額定容量，kVA ;cos ：功率因數(shù)。(4)電爐變壓器的設(shè)備功率是指額定功率因數(shù)時(shí)的有功功率。I I PN =Sr cosQkW(5-2-4)式中Sr 電爐變壓器的額定容量，kVA。(5)整流器的設(shè)備功率是指額定直流功率。(6)成組用電設(shè)備的設(shè)備功率是指不包括備用設(shè)備在內(nèi)的所有單個(gè)用電設(shè)備的設(shè)備功率之和。(7

3、)白熾燈的設(shè)備功率為燈泡額定功率。氣體放電燈的設(shè)備功率為燈管額定功率加上鎮(zhèn)流器的功率損耗(熒光燈加20%,熒光高壓汞燈、高壓鈉燈及鋪加燈加 8%)。二、計(jì)算需要系數(shù)法確定計(jì)算負(fù)荷(1)用電設(shè)備組的計(jì)算負(fù)荷及計(jì)算電流：有功功率Pjs = Kx Pn ,kW ( 5-2-5)無功功率Qjs = PjstgP ,kvar(5-2-6)視在功率Sjs = p Pj2 + Q> kVA (5-2-7)Si.計(jì)算電流 I js =/一,A (5-2-8) j .3Ur(2)配電干線或車間變電所的計(jì)算負(fù)荷：有功功率Pjs =K£p£(KxPn)，kW (5-2-9)無功功率Qjs

4、= K£q£(KxPNtg 邛),kvar(5-2-10)視在功率Sjs = jPj2 +Q2s, kVA(5-2-11)以上式中Pn 用電設(shè)備組的設(shè)備功率，kW;Kx 需要系數(shù)；見表 5-2-1、表5-2-2及表5-2-3;tg 用電設(shè)備功率因數(shù)角的正切值，見表 5-2-1、表5-2-3、表5-2-4及表5-2-5; .X A 、-" L- /'J'；Kp、Kgq 有功功率、無功功率同時(shí)系數(shù)，分別取 0.80.9和0.930.97;Ur用電設(shè)備額定電壓(線電壓)，kVo表5-2-1用電設(shè)備的Kx、cos邛及tg。用電設(shè)備組名稱單獨(dú)傳動(dòng)的金屬加工機(jī)

5、床小批生產(chǎn)的金屬冷加工機(jī)床0.120.160.501.73大批生產(chǎn)的金屬冷加工機(jī)床.0.170.200.501.73小批生產(chǎn)的金屬熱加工機(jī)床0.200.250.550.601.511.33大批生產(chǎn)的金屬熱加工機(jī)床 10.250.280.651.17鍛錘、壓床、剪床及其他鍛工 機(jī)械00.250.601.33木工機(jī)械0.200.300.500.601.731.33液壓機(jī)0.300.601.33生產(chǎn)用通風(fēng)機(jī)0.750.850.800.850.750.62衛(wèi)生用通風(fēng)機(jī)0.650.700.800.75泵、活塞型壓縮機(jī)、電動(dòng)發(fā)電 機(jī)組0.750.850.800.75球磨機(jī)、破碎機(jī)、篩選機(jī)、攪 攔機(jī)等0.7

6、50.850.800.850.750.62電阻爐(帶調(diào)壓器或變壓器)非自動(dòng)裝料0.600.700.950.980.330.20自動(dòng)裝料0.700.800.950.980.330.20干燥箱、加熱器等0.400.601.000工頻感應(yīng)電爐（/、帶尢功補(bǔ)償 裝置）0.800.352.68局頻感應(yīng)電爐（/、帶尢功補(bǔ)償 裝置）0.800.601.33焊接和加熱用圖頻加熱設(shè)備0.500.65 10.701.02熔煉用高頻加熱設(shè)備0.800.850.800.850.750.62表面淬火電爐（帶無功補(bǔ)償裝置）電動(dòng)發(fā)電機(jī)0.650.701.02真空管振蕩器0.800.850.62中頻電爐（中頻機(jī)組）0.650

7、.750.800.75氫氣爐（帶調(diào)壓器或變壓器）一0.400.500.850.900.620.48真空爐（帶調(diào)壓器或變壓器）0.550.650.850.900.620.48電弧煉鋼爐變壓器0.900.850.62電弧煉鋼爐的輔助設(shè)備一0.15 0.501.73點(diǎn)焊機(jī)、縫焊機(jī)0.35,0.2(f0.601.33對(duì)焊機(jī)0.350.701.02自動(dòng)弧焊變壓器 一0.5010.501.73單頭手動(dòng)弧焊變壓器0.350.352.68多頭手動(dòng)弧焊變壓器0.400.352.68單頭直流弧焊機(jī)0.351，；0.601.33多頭直流弧焊機(jī)0.700.701.02金屬、機(jī)修、裝配車間、鍋爐 房用起重機(jī)（=25%）

8、0.100.150.51.73鑄造車間起重機(jī)（=25%）0.150.30 0.51.73聯(lián)鎖的連續(xù)運(yùn)輸機(jī)械0.650.750.88非聯(lián)鎖的連續(xù)運(yùn)輸機(jī)械;0.500.600.750.88一般工業(yè)用硅整流裝置0.500.701.02電鍍用硅整流裝置0.500.750.88電解用硅整流裝置0.700.800.75紅外線干燥設(shè)備二0.850.9011.000.00電火花加裝置0.500.601.33超聲波裝置0.700.701.02X光設(shè)備0.300.551.52電子計(jì)算機(jī)主機(jī)0.600.700.800.75電子計(jì)算機(jī)外部設(shè)備0.400.500.501.73試驗(yàn)設(shè)備（電熱為主）0.200.40 10.

9、800.75試驗(yàn)設(shè)備（儀表為主）0.150.200.701.02磁粉探傷機(jī)0.200.402.29鐵屑加工機(jī)械0.400.750.88排氣臺(tái)0.500.600.900.48老煉臺(tái)0.600.700.701.02陶瓷隧道窯，0.800.900.950.33拉單品爐0.700.7510.900.48賦能腐蝕設(shè)備0.600.930.40真空浸漬設(shè)備0.700.950.33點(diǎn)焊機(jī)的需要系數(shù)0.2僅用于電子行業(yè) 表5-2-2照明用電設(shè)備需要系數(shù)建筑類別Kx建筑類別Kx生產(chǎn)廠房（有天然0.800.90宿舍區(qū)0.600.80生產(chǎn)廠房（無天然0.901.00醫(yī)院0.50辦公樓0.700.80食堂0.900.9

10、5設(shè)計(jì)室0.900.95商店0.90科研樓0.800.90學(xué)校0.600.70倉庫0.500.70展覽館0.700.80鍋爐房0.90旅館0.600.70表5-2-3旅游旅館用電設(shè)備的Kx、cos邛及tg中用電設(shè) 備組名 稱Kx用電 設(shè)備 組名 稱Kx11,、1 /|昭八、明客 房0.350.450.950.33電梯0.18-0.220.501.73其 他 場 所0.500.70洗衣 機(jī)0.300.350.701.02冷水機(jī) 組、泵0.650.750.800.75廚房 設(shè)備0.350.450.750.88通風(fēng)機(jī)0.600.700.800.75窗式 空調(diào) 器0.350.450.800.75表5-

11、2-4照明用電設(shè)備的cos中及tg中光源類別j" 1 1 光源類別白熾燈、鹵 鴇燈1.000.00高壓鈉燈0.451.98熒光燈（無 補(bǔ)償）0.551.52金屬鹵化 物燈0.400.612.291.29熒光燈（有 補(bǔ)償）0.900.49鋪燈0.521.60高壓汞燈0.450.651.981.16氤燈0.900.48表5-2-5cos中與tg邛、sin中1.0000.0000.0000.8700.5670.4930.6501.1690.7600.9900.1420.1410.8600.5930.5100.6001.3330.8000.9800.2030.1990.8500.6200.5

12、270.5501.5180.8350.9700.2510.2430.8400.6460.5430.5001.7320.8660.9600.2920.2800.8300.6720.5580.4501.9850.8930.9500.3290.3120.8200.6980.5720.4002.29110.9160.9400.3630.3410.8100.7240.5860.3502.6760.9370.930P 0.3950.3670.8000.7500.6000.3003.1800.9540.920P 0.4260.3920.7800.8020.6260.2503.8730.9680.9100.4560.4150.7500.8820.6610.2004.8990.9800.900P 0.4840.4360.7200.9640.6940.1506.591 10.9890.8900.5120.4560.7001.0200.7140.1009.9