Lightning protection system
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Lightning Protection System

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(Lightning Protection System)

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


"" (Cumulonimbus

Cloud)


1. (P) (N)


2.


3.


4.


5. step leader


6. upward streamers step leader


7. step leader upward streamers lightning channel current


8. return stroke


9. J & K phenomena


10. Dart leader


8 remote earth


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


(Transients)

, , 2 1. Impulsive Transient /

(surge)2. Oscillatory Transient /

2 oscillatory

transient


(Short Duration)

  • (rms)

  • 3

  • Interruption 1 pu. 90% 1 clear fault


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

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


( 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)

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


(Waveform distortion)

(steady state) 5

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


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


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

4. Notching


5. Noise


(Voltage unbalance)


(Power frequency variation)

50Hz.


-

  • remote earth


1. Air Terminal


2. (Down Lead Down Conductor)


ground ring

1. Self Support


2. Guy Mast


down lead

(Lightning counter)


3. (Lightning ground)


(Grounding System)

1. (System Ground)



Master Ground Bar (MGB)


earth tester 0.01

1. 3 2. Grounding Profile

1. coupling 2.


1. (air terminal)

3

.

.

.

2. (down conductor)


3. (earth electrode)


4.

.

.

.


Remote Earth

  • ground plane ( )

  • ()

  • same potential ?


Remote Earth

remote earth

remote earth


(AC Line Surge Protector)

  • capacitor bank


1.

1.1 1.1.1 1.1.2 1.1.3

1.1.4 -

1.1.5 -


1.2 2

1.2.1 Transient ( surge) 8/20 usec.

1.2.2 swell ( surge ) 50 Hz. capacitor bank


1.3 1.4 MOV (Metal Oxide Varistor) MOV


1.5 1.6


2. 2.1 1 220 V, 50 Hz.

2.2 3

4 380/220 V, 50 Hz.


1.

01-9292693

2.

01-8735541

NECTEC

130/82 . 30 . . . . 11000

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


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