Lightning protection system
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Lightning Protection System

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Lightning protection system

(Lightning Protection System)

  • 1. 2. 3. 4. 5. Remote Earth6. AC Line Surge Protector


Lightning protection system

"" (Cumulonimbus

Cloud)


Lightning protection system

1. (P) (N)


Lightning protection system

2.


Lightning protection system

3.


Lightning protection system

4.


5 step leader

5. step leader


6 upward streamers step leader

6. upward streamers step leader


7 step leader upward streamers lightning channel current

7. step leader upward streamers lightning channel current


8 return stroke

8. return stroke


9 j k phenomena

9. J & K phenomena


Lightning protection system

10. Dart leader


Lightning protection system

8 remote earth


Lightning protection system

  • 1. (Transients)2. (Short duration)3. (Long duration)4. (Voltage fluctuations)5. (Waveform distortion)6. (Voltage unbalance)7. (Power frequency variation)


Transients

(Transients)

, , 2 1. Impulsive Transient /

(surge)2. Oscillatory Transient /

2 oscillatory

transient


Short duration

(Short Duration)

  • (rms)

  • 3

  • Interruption 1 pu. 90% 1 clear fault


Lightning protection system

2. Sags(Dips) 0.1 - 0.9 pu. 10-90% 1

3. Swells 1.1 - 1.8 pu. 10 - 80% 1


Long duration

( Long Duration)

(rms)

1 3

1. Sustained interruption 1 Outage , Black out

2. Undervoltage 10% (0.8 - 0.9 pu.) 1 , Brown out3. Overvoltage 10% (1.1 - 1.2 pu.) 1


Voltage fluctuation

(Voltage fluctuation)

(rms) +/- 10% (0.9 - 1.1 pu.) flicker (Arc furnace)


Waveform distortion

(Waveform distortion)

(steady state) 5

1. DC offset ( AC) (DC) (Half-wave Rectifier)


Lightning protection system

2. Harmonics 50 Hz. 2 (100Hz.) gas discharge , 50 Hz.


Lightning protection system

3. Interharmonic 50 Hz. 2.5 125 Hz. (Arc furnace)

4. Notching


Lightning protection system

5. Noise


Voltage unbalance

(Voltage unbalance)


Power frequency variation

(Power frequency variation)

50Hz.


Lightning protection system

-

  • remote earth


Lightning protection system

1. Air Terminal


2 down lead down conductor

2. (Down Lead Down Conductor)


Ground ring

ground ring

1. Self Support


Lightning protection system

2. Guy Mast


Lightning protection system

down lead

(Lightning counter)


3 lightning ground

3. (Lightning ground)


Grounding system

(Grounding System)

1. (System Ground)


Lightning protection system


Lightning protection system

Master Ground Bar (MGB)


Lightning protection system

earth tester 0.01

1. 3 2. Grounding Profile

1. coupling 2.


Lightning protection system

1. (air terminal)

3

.

.

.

2. (down conductor)


3 earth electrode

3. (earth electrode)


Lightning protection system

4.

.

.

.


Remote earth

Remote Earth

  • ground plane ( )

  • ()

  • same potential ?


Remote earth1

Remote Earth

remote earth

remote earth


Ac line surge protector

(AC Line Surge Protector)

  • capacitor bank


Lightning protection system

1.

1.1 1.1.1 1.1.2 1.1.3

1.1.4 -

1.1.5 -


1 2 2

1.2 2

1.2.1 Transient ( surge) 8/20 usec.

1.2.2 swell ( surge ) 50 Hz. capacitor bank


Lightning protection system

1.3 1.4 MOV (Metal Oxide Varistor) MOV


Lightning protection system

1.5 1.6


2 2 1 1 220 v 50 hz

2. 2.1 1 220 V, 50 Hz.

2.2 3

4 380/220 V, 50 Hz.


Lightning protection system

1.

01-9292693

2.

01-8735541

NECTEC

130/82 . 30 . . . . 11000

Tel : 02-5881557 , 02-9517419-0 Fax 02-9517330


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