Creepage-Clearance-TECTRAIN04(介绍高压产品爬电距离与电气间隙的计算方式)
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Working Voltage : The highest rms value (or dc) which can occur between 2 points across an insulation (Maximum permanent voltage) Rated insulation voltage UNm : An rms withstand voltage value assigned by the manufacturer to a equipment characterising the specified permanent (5 minutes) withstand capability of insulation. => UNm > Max local voltage Rated impulse voltage UNi : An impulse voltage value assigned by the manufacturer to the equipment characterising the specified withstand capability of its insulation against transient over voltages.
0.72 0.9 1.8 9
CREEPAGE & CLEARANCE UNi Rated Impulse Voltage
Rated Voltage UNm
Paragraph 2.2 :
Method 1 : =>Table A2 or A1 Method 2 : => Refer standard
OV
Creepage & Clearance parameters
High Voltage
Clearance Creepage
Ground
APPLICATION Environment (Humidity) Safety level
Single or Double Insulation
PRODUCT Voltage Voltage Material Shape
Paragraph 2.6.1.3 :
Material group I II IIIa IIIb CTI 600<CTI 400<CTI<600 175<CTI<400 100<CTI<175 Class Class 1A4.5 Class 1A3.5 Class 1A2.5 Class 1A0
Over voltage Category (application)
TECTRAIN Mai 2004 Erick Pauchet 8
CREEPAGE & CLEARANCE UNm : Rated voltage
Data supplied by customer or Correlation between Un and UNm
Table D1- Annex D :
Application Voltage Voltage Voltage
Rated Voltage UNm Nominal Voltage UN
Battery supply kV
0.6 0.75 1.5 18/01/2013
0.72 0.9 1.8 TECTRAIN Mai 2004 Erick Pauchet
Paragraph 6.3.1.1 :
OV1 : OV2 : OV3 : OV4 :
18/01/2013
circuits which are protected against external & internal over voltages and which only very low voltage can occur. The same as OV1, but with harsher over voltage condition and-or higher requirement concerning safety and reliability The same as OV4, but with less harsh over voltage condition and-or lower requirement concerning safety and reliability Circuits which are not protected against external or internal over voltages.
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 6
CREEPAGE & CLEARANCE Pollution Degree
Paragraph 2.5 - Table A4 :
PD1 Dust deposit no pollution non conductive well protected protected non conductive temporary conductivity low conductivity low conductivity Occasionally conductive with periodic cleaning Occasionally conductive coming from heavy pollution Humidity Dry no condensation
PD2
Rare, short Temporary condensation
PD3 PD3A PD4
Frequent condensation damp, long time condensation Rain, snow, ice, fog
PD4A
Rain, snow, ice, fog
18/01/2013
•Creepage •Clearance
6.7
Creepage & clearance
5.2.16
Safety Requirements
EN 50124
Equivalent results (Unified standards)
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 3
PD4B
Occasionally conductive Rain, snow, ice, fog TECTRAIN Mai 2004 Erick Pauchet coming from very heavy pollution
7
CREEPAGE & CLEARANCE Comparative Tracking Index (Material characteristic)
3/ Electron flow through material EN 50124 scope = 1/ + 2/ only Protection against electric shocks
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 2
Creepage & Clearance Links with usable standards
Table A2 or A1
Uni
Rated impulse Voltage
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
10
IF IN The APPLICATION FIELD is NOT CLEARLY DEFINED : LEM take in consideration the INDUSTRIAL APPLICATION • Pollution degree PD2 (non conductive pollution & temporary conductivity caused by condensation) • Over voltage category OV III • Calculation : OVIII= In building EN 50178 = IEC 61010 (<1500V)
Creepage & Clearance EN 50124 standard (1999)
Railway application Basic coordination part 1:
Basic requirements : Clearances and creepage distances for all electrical & electronic equipment
CE Field: Electrical Equipment (75 Vdc/1500 Vdc) measurement
CE Marking (Safety)
Application standard
Mains Standards
LVD 73/23 EN 61010
EN 50178
EN 50155
Others
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 1
EN 50124 scope The 3 insulation failure modes
High Voltage
1/ Electron flow in air : Clearance
Ground
2/ Electron flow on material surface : Creepage
Supplementary insulation : An independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of failure of the basic insulation. Example : Fuse, ground connection … Double insulation = Basic insulation + Supplementary insulation Symbol =
Pollution Degree PD
Rated Voltage UNm Over voltage Category OV Rated Impulse Voltage UNi
Nominal Voltage UN
百度文库
Comparative Tracking Index CTI
Distances Cp - Cr
Requested between end user and the system.
Reinforced insulation : A single insulation system applied to live parts, wich provides a degree of protection against electric shock equivalent to double protection.
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
4
CREEPAGE & CLEARANCE Voltage definition
Nominal Voltage Un : A suitable approximate voltage value used to designate a given supply system
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
5
CREEPAGE & CLEARANCE Insulation definition
Basic insulation : The insulation applied to live part to provide basic protection against electric shocks .
=>for railway power distribution
Nominal Voltage Un Power supply According to EN 50163 dc (kV) dc (kV) Minimum values of the rated insulation Voltage Unm Rolling stock kV Fixed installation kV
0.72 0.9 1.8 9
CREEPAGE & CLEARANCE UNi Rated Impulse Voltage
Rated Voltage UNm
Paragraph 2.2 :
Method 1 : =>Table A2 or A1 Method 2 : => Refer standard
OV
Creepage & Clearance parameters
High Voltage
Clearance Creepage
Ground
APPLICATION Environment (Humidity) Safety level
Single or Double Insulation
PRODUCT Voltage Voltage Material Shape
Paragraph 2.6.1.3 :
Material group I II IIIa IIIb CTI 600<CTI 400<CTI<600 175<CTI<400 100<CTI<175 Class Class 1A4.5 Class 1A3.5 Class 1A2.5 Class 1A0
Over voltage Category (application)
TECTRAIN Mai 2004 Erick Pauchet 8
CREEPAGE & CLEARANCE UNm : Rated voltage
Data supplied by customer or Correlation between Un and UNm
Table D1- Annex D :
Application Voltage Voltage Voltage
Rated Voltage UNm Nominal Voltage UN
Battery supply kV
0.6 0.75 1.5 18/01/2013
0.72 0.9 1.8 TECTRAIN Mai 2004 Erick Pauchet
Paragraph 6.3.1.1 :
OV1 : OV2 : OV3 : OV4 :
18/01/2013
circuits which are protected against external & internal over voltages and which only very low voltage can occur. The same as OV1, but with harsher over voltage condition and-or higher requirement concerning safety and reliability The same as OV4, but with less harsh over voltage condition and-or lower requirement concerning safety and reliability Circuits which are not protected against external or internal over voltages.
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 6
CREEPAGE & CLEARANCE Pollution Degree
Paragraph 2.5 - Table A4 :
PD1 Dust deposit no pollution non conductive well protected protected non conductive temporary conductivity low conductivity low conductivity Occasionally conductive with periodic cleaning Occasionally conductive coming from heavy pollution Humidity Dry no condensation
PD2
Rare, short Temporary condensation
PD3 PD3A PD4
Frequent condensation damp, long time condensation Rain, snow, ice, fog
PD4A
Rain, snow, ice, fog
18/01/2013
•Creepage •Clearance
6.7
Creepage & clearance
5.2.16
Safety Requirements
EN 50124
Equivalent results (Unified standards)
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 3
PD4B
Occasionally conductive Rain, snow, ice, fog TECTRAIN Mai 2004 Erick Pauchet coming from very heavy pollution
7
CREEPAGE & CLEARANCE Comparative Tracking Index (Material characteristic)
3/ Electron flow through material EN 50124 scope = 1/ + 2/ only Protection against electric shocks
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 2
Creepage & Clearance Links with usable standards
Table A2 or A1
Uni
Rated impulse Voltage
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
10
IF IN The APPLICATION FIELD is NOT CLEARLY DEFINED : LEM take in consideration the INDUSTRIAL APPLICATION • Pollution degree PD2 (non conductive pollution & temporary conductivity caused by condensation) • Over voltage category OV III • Calculation : OVIII= In building EN 50178 = IEC 61010 (<1500V)
Creepage & Clearance EN 50124 standard (1999)
Railway application Basic coordination part 1:
Basic requirements : Clearances and creepage distances for all electrical & electronic equipment
CE Field: Electrical Equipment (75 Vdc/1500 Vdc) measurement
CE Marking (Safety)
Application standard
Mains Standards
LVD 73/23 EN 61010
EN 50178
EN 50155
Others
18/01/2013 TECTRAIN Mai 2004 Erick Pauchet 1
EN 50124 scope The 3 insulation failure modes
High Voltage
1/ Electron flow in air : Clearance
Ground
2/ Electron flow on material surface : Creepage
Supplementary insulation : An independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of failure of the basic insulation. Example : Fuse, ground connection … Double insulation = Basic insulation + Supplementary insulation Symbol =
Pollution Degree PD
Rated Voltage UNm Over voltage Category OV Rated Impulse Voltage UNi
Nominal Voltage UN
百度文库
Comparative Tracking Index CTI
Distances Cp - Cr
Requested between end user and the system.
Reinforced insulation : A single insulation system applied to live parts, wich provides a degree of protection against electric shock equivalent to double protection.
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
4
CREEPAGE & CLEARANCE Voltage definition
Nominal Voltage Un : A suitable approximate voltage value used to designate a given supply system
18/01/2013
TECTRAIN Mai 2004 Erick Pauchet
5
CREEPAGE & CLEARANCE Insulation definition
Basic insulation : The insulation applied to live part to provide basic protection against electric shocks .
=>for railway power distribution
Nominal Voltage Un Power supply According to EN 50163 dc (kV) dc (kV) Minimum values of the rated insulation Voltage Unm Rolling stock kV Fixed installation kV