obeyTN-C、TN-S、TN-C-S、TT系统区别

devel

opment

s be

nefit families, bring mor

e welfare to the masses. Devel

opme

nt of social conve

nience. A

cce

ptance of bala

nce

d dev

elopm

ent of compul

sory e

ducati

on t

hroug

h the

national asse

ssment, t

he County vocational e

ducation

center wa

s named

onal e

ducation in China

batch

of national reform and

development model through

provi

ncial ...

Five is to dee

pen reform a

nd i

nnovation to

break bottlene

cks a

nd

endoge

nous development of effective fire. A

s an engi

ne of

dynamism, a

ddi

ng reform key to a

dopting reform measures stre

ss e

nergy and bre

ak bottlene

cks a

nd

promoti

ng devel

opme

nt. Pay

close attenti

on to the key

area

s of r

eform. Consci

entiously im

plement t

he pr

ovincial

depl

oyment a

nd

cancel, a

djustment, to

undertake the admini

strative approval items a

ccordi

ng to Regulati

on

347 to f

urther impr

ove admi

nistrative efficie

ncy

conti

nui

ng deepe

ning

reform for poverty a

lleviation, spee

ding

up r

ural land right regi

stration certification pil

ot pr

oject, encouraging the or

derly transfer

of land management, utilize the l

and resource

s, in order to

promote

scale ma

nagement l

aid t

he Foundation. Actively

cultivate t

he market. Firm

ly esta

blish a market- ori

ented, nurturing

family farms, industrial

users, professional cooperation

organizati

on new market ma

nagement mai

n body 456, effectively impr

ove the industr

y, inte

nsive

and

marketization of encouraging support social

capital i

nto the

small micro

-cre

dit, urban development, culture a

nd tourism,

public servi

ces a

nd

other area

s, easi

ng devel

opment

shortfall. To pr

omote mass i

nnovation.

To support the rural se

ctor to

use new thi

nking a

nd new idea

s, creative w

or

k incentive

s such a

s actively pr

omoting fina

ncial intermediati

on,

bring a

dde

d 159 i

n non publi

c enter

prises, i

ndivi

dua

lly-1540, create

d a

（

3

）

TN-C

方式供电系统

它是用工作零线兼作接零保护线，可以称作保护中性线，可用

NPE

表示

（

4

）

TN-S

方式供电系统

它是把工作零线

N

和专用保护线

PE

严格分开的供电系统，称作

TN-S

供电系

统，

TN-S

供电系统的特点如下。

1

）

系统 正常运行时，

专用保护线上不有电流，

只是工作零线上有不平衡 电流。

PE

线对地没有电压，所以 电气设备金属外壳接零保护是接在专用的保护线

PE

上，安

全可靠。

2

）工作零线只用作单相照明负载回路。

3

）专用保护线

PE

不许断线，也不许进入漏电开关。

4

）干线上使用漏电保护器，工作零线不得有重复接地，而

PE

线有重复接地，但

是不经过漏电 保护器，所以

TN-S

系统供电干线上也可以安装漏电保护器。

5

）

TN-S

方式供电系统安全可靠，

适用于工业与民用建筑等低 压供电系统。

在

建筑工程工工前的“三通一平”

（电通、水通、路通和地平

--

必须采用

TN-S

方

式供电系统。

二，供电线路符号小结

5/6/2010 10:48:21 AM

1

）国际电工委员会（

IEC

）规定的供电方式符号中，第一个字母表示电力（电

源）系统对地关系 。如

T

表示是中性点直接接地；

I

表示所有带电部分绝缘。

2

）第二个字母表示用电装置外露的可导电部分对地的关系。如

T

表示设备外壳

接地，它与系统中的 其他任何接地点无直接关系；

N

表示负载采用接零保护。

3

）第三个字母表示工作零线与保护线的组合关系。如

C

表示工作零线与保护线

是合一的，如

TN-C

；

S

表示工作零线与保护线是严格分开的，所以

PE

线称为

专用保护线，如

TN-S

。

Ｔ

N

系统：电源变压器中性点接地，设备外露部分与中性线相 连。

ＴＴ系统：电源变压器中性点接地，电气设备外壳采用保 护接地。

ＩＴ系统：电源变压器中性点不接地（或通过高阻抗 接地），而电气设备外壳电气

设备外壳采用保护接地。

1

、

TN

系统

5/6/2010

10:52:49

AM

Pushing a

head, Ea

st, North, We

st devel

opment, facilitating shant

y, complete xinche

ng West Roa

d, stability and re

construction of the street, Star Di

ng garde

n built ce

ntury Gar

den

District, subject

public housing

construction, heati

ng the gas expa

nsi

on a

ccel

erated im

pleme

ntation, Jing Rui River and bridge

style line

soli

d shaft, further expanded t

he tow

n devel

opme

nt. Beautiful

country adhere to t

he adva

nce a

nd ty

pical for a group t

o lead.

According t

o

ogical lay

base

d, and industry i

ncreased income

, and l

ive upgra

de civi

lization, and culture ri

ch connotati

on

caug

ht built beautiful vill

age, and whole village a

dvance, a

nd eas

ily relocation, and

built

ct near 30 a; depth i

nto e

col

ogical, a

nd i

ndustry, a

nd

cult

ure, and tourism, eleme

nts, hig

h standards ca

ught party origi

nal city

Liu, a

nd ja

de are

Xia AO, m

odel vill

age, in

province City

set has benchmark. F

our is e

qual be

nefits to pr

omote sharing,

coordinate

d devel

opme

nt of various social

undertakings.

In the case of rigid

spe

ndi

ng slowing reve

nue growth, increase, financial 75% t

o the people's liveli

hood, t

he masse

s have more a

cce

ss in t

he sharing.

Cuo

ba

n somet

hing good a

nd benefit. A

dhere to t

he affordabl

e, best

, carefully cuoban v

illage oil

, water and

heat, cultural,

city

and County colum

ns

practical

, devel

opment

s be

nefit families, bring mor

e welfare to the masses. Devel

opme

nt of social conve

nience. A

cce

ptance of bala

nce

d dev

elopment of compul

sory e

ducati

on t

hroug

h the

national asse

ssment, t

he County vocational e

ducation

center wa

s named

onal e

ducation in China

batch

of national reform and

development model through

provi

ncial ...

Five is to dee

pen reform a

nd i

nnovation to

break bottlene

cks a

nd

endoge

nous development of effective fire. A

s an engi

ne of

dynamism, a

ddi

ng reform key to a

dopting reform measures stre

ss e

nergy and bre

ak bottlene

cks a

nd

promoti

ng devel

opme

nt.

Pay

close attenti

on to the key area

s of r

eform. Consci

entiously im

plement t

he pr

ovincial

depl

oyment a

nd

cancel, a

djustment, to

undertake the admini

strative approval items a

ccordi

ng to Regulati

on

347 to f

urther impr

ove admi

nistrative efficie

ncy

conti

nui

ng d

eepe

ning

reform for poverty a

lleviation, spee

ding

up r

ural land right regi

stration certification pil

ot pr

oject, encouraging t

he or

derly transfer

of land management, utilize the l

and resource

s, in order to

promote

scale ma

nagement l

aid t

he Foundation. Actively

cultivate t

he market. Firmly esta

blish a market-ori

ented, nurturing

family farms, industrial

users, professional cooperation

organizati

on new market ma

nagement mai

n body 456, effectively impr

ove the industr

y, inte

nsive

and

marketization of encouraging support social

capital i

nto the

small micro

-cre

dit, urban development, culture a

nd tourism,

public servi

ces a

nd

other area

s, easi

ng devel

opment

shortfall. To pr

omote mass i

nnovation.

To support the rural se

ctor to

use new thi

nking a

nd new idea

s, creative w

or

k incentive

s such a

s actively pr

omoting fina

ncial intermediati

on,

bring a

dde

d 159 i

n non publi

c enter

prises, i

ndivi

dua

lly-1540, create

d a