🔔Help Electro Academy grow! 🔔 Your support can make a big difference! 😍 If you appreciate the efforts behind these educational videos, please subscribe - it’s free and just a click away.!🙏🏽 Additionally, if you can contribute, you can become a patron and support our mission of sharing knowledge with students and professionals around the world: patreon.com/ElectroAcademy 🙌 I am deeply grateful to our first sponsor! Your kind gestures motivate us to continue creating quality content. Let’s build this community together.!🏆 THANKS .! - Sudarshan, Creator of Electro Academy
Hi team, we looking for SDP suiting our needs , need more info to select for our load ( if you supply SDP too , we looking for huge demand ) How can we contact you ? Something urgent .thank you
I think the scheme is wrong, if lightning strikes and the fuses in the OCPD are blown, the circuit of the house will not be protected, the circuit to the house must be after the OCPD and followed by the RCCB and MCB, for mains peaks it is ok but not for lightning
@@MD5Biker Over current protection devices (OCPD) general response time is within 8 to 185 milliseconds. They wont blown during a lightening strike or during a voltage spike. Although high in magnitude, sudden voltage spikes are super fast and disappears within 1 to 30 microseconds. So, OCPD will just sit there without knowing that such large spike has come and gone after damaging lot of equipment.
@@ElectroAcademyEA from what you say it is understood that you cannot be protected against lightning strikes with an SPD preceded by an OCPD regardless of whether you use it according to the scheme presented by you or the one described by me in the previous comment, in conclusion if you are unlucky that the network is struck near by lightning, you will not be protected in any way.
No, you should have bought the 275 V one, the 385 V is for three-phase line, even the 275V one is quite high, but I don't know if there are values closer to 250V
@unlimitedfun702 Yes. For most residential and small commercial single-phase systems, a 40kA, UC 385V SPD provides adequate protection against common surges caused by lightning or grid disturbances. If you need enhanced protection (e.g., if you have highly sensitive electronics or you're in a high-risk area for surges), you could opt for a higher kA rating, but 40kA should suffice for general use. A UC rating of 275V-385V is common for single-phase systems, especially in regions with a 230V nominal voltage (like Sri Lanka and many other countries). The 385V rating is a good selection and allows the SPD to tolerate short-term overvoltages (which can occur in real-world conditions) without triggering and also without harming any equipment. However, if you go for lower value for Uc like 275V instead of 385V, SPD will operates unnecessarily to clamp voltage spikes around 300 volts and the lifespan of the SPD will be affected.
5:00 This waveform is for a 230V LN (as the case for Europe's electrical standard). But for a 240V split phase (as in USA and some part of the world), we get two 170V LN waveforms, one being opposite of the other. Having said that, should n't we use a lower Voltage rated SPD?
In a typical U.S. residential split-phase system, you have: 120V line-to-neutral (LN) voltage from each "hot" line to neutral. 240V line-to-line (LL) voltage between the two "hot" lines. SPDs are rated based on the maximum continuous operating voltage (Uc) they can withstand. This rating must account for the system's nominal voltage plus any temporary overvoltages that can occur during normal operation. In a 240V split-phase system, SPDs are often selected based on the line-to-line (LL) voltage (240V), not just the line-to-neutral (LN) voltage (120V), because the SPD needs to handle surges across both "hot" lines. Why Not Use a Lower Voltage Rated SPD? Higher Voltage Spikes Across Hot Lines: Even though each line is 120V LN, surges can often occur between the two lines (L1 and L2), which can result in voltages approaching or exceeding 240V line-to-line (or more during a surge). Therefore, the SPD must be rated to handle this 240V LL situation, which means a higher voltage SPD is necessary to protect both the line-to-neutral and line-to-line configurations. Although the system has 120V line-to-neutral (LN) waveforms, the SPD needs to be rated for the 240V line-to-line voltage and potential surges that may exceed that. Using a lower voltage-rated SPD (e.g., 150V or 170V) could result in under-protection, as it might not handle the higher line-to-line surges or temporary overvoltages. Thus, a higher voltage SPD (e.g., 385V UC) is appropriate for ensuring complete protection in a 240V split-phase system. For more info, please get the help of a good electrician.
This is so confusing! Do I need a type 1 SPD installed if I have a Type 2 installed at the entrance of the circuit? If I do need a Type 1 as well, then can I install it along with the Type 2 (same location)?
If your building is directly connected to an external power line (like overhead power lines), or if it's in an area prone to lightning strikes, it’s advisable to install a Type 1 SPD to handle the larger surges from direct strikes. A Type 2 SPD alone provides good protection from internal switching surges and indirect lightning strikes, but it’s not designed to handle direct lightning strikes or very high-energy surges that can occur at the main service entrance. Installation of Type 1 and Type 2 SPDs: Can they be installed at the same location? Yes! In fact, it’s common practice to install both Type 1 and Type 2 SPDs in the same electrical panel, typically at the main electrical distribution board. The Type 1 SPD handles the higher energy surge (from a direct lightning strike or external grid surge). The Type 2 SPD protects against lower-energy residual surges (coming from the Type 1 or switching surges within the building). They are often installed in a coordinated manner, where the Type 1 SPD acts as the first line of defense, and the Type 2 SPD provides secondary protection.
What if I have a spd with the following rating installed in a 230VAC Line-Line sytem. Uc =275v , In =20kA Imax=40kA, Up=1.8kV Approximately how long the spd will fail(turns to red) if the voltage spikes around my power system ranging from 280-380vac?
Since this SPD's maximum continuous voltage reads as 275 volts, 280-380 VAC surges are not a threat to this SPD. It will last till it reaches critical values, that is "In" for at least 15 times, and "Imax" at least one time.
Ideal separation ensure a minimum of 10 meters (33 feet) of cable length between the Type 2 and Type 3 SPDs for effective coordination. If the distance is not feasible, needs to consider using inductive coils or combined SPDs to achieve the desired protection. Proper coordination between SPDs is essential for protecting sensitive equipment, especially in environments where both large surges and small, localized spikes are possible.
Yes. AC and DC SPDs are different, and they are designed to handle the distinct characteristics of AC and DC power systems. You must select the appropriate SPD based on whether your system is AC or DC, considering the voltage rating, current type, and specific application (e.g., residential AC system or solar DC system).
🔔Help Electro Academy grow! 🔔
Your support can make a big difference! 😍
If you appreciate the efforts behind these educational videos, please subscribe - it’s free and just a click away.!🙏🏽
Additionally, if you can contribute, you can become a patron and support our mission of sharing knowledge with students and professionals around the world: patreon.com/ElectroAcademy 🙌
I am deeply grateful to our first sponsor! Your kind gestures motivate us to continue creating quality content. Let’s build this community together.!🏆
THANKS .!
- Sudarshan, Creator of Electro Academy
Hi team, we looking for SDP suiting our needs , need more info to select for our load ( if you supply SDP too , we looking for huge demand ) How can we contact you ? Something urgent .thank you
Please explain different models of basic VFD parameters settings for beginners
I think the scheme is wrong, if lightning strikes and the fuses in the OCPD are blown, the circuit of the house will not be protected, the circuit to the house must be after the OCPD and followed by the RCCB and MCB, for mains peaks it is ok but not for lightning
@@MD5Biker Over current protection devices (OCPD) general response time is within 8 to 185 milliseconds. They wont blown during a lightening strike or during a voltage spike.
Although high in magnitude, sudden voltage spikes are super fast and disappears within 1 to 30 microseconds.
So, OCPD will just sit there without knowing that such large spike has come and gone after damaging lot of equipment.
@@ElectroAcademyEA from what you say it is understood that you cannot be protected against lightning strikes with an SPD preceded by an OCPD regardless of whether you use it according to the scheme presented by you or the one described by me in the previous comment, in conclusion if you are unlucky that the network is struck near by lightning, you will not be protected in any way.
Excellent explanation on SPDs. Now I know what the various variables (Uc, Up, In, Imax) written on SPDs mean
Thank you
Excellent information, even ChatGPT could not give it.
Thank you
Very good Explanation
Thank you
Very useful explanation
Thank you
Good information 👍
Thank you
just supreb. very nicely explained.
Thank you
Great explanation
Thank you
I bought 40ka Uc 385V for single phase 230volt AC line.
Is it properly work my house???
Please reply me
No, you should have bought the 275 V one, the 385 V is for three-phase line, even the 275V one is quite high, but I don't know if there are values closer to 250V
@unlimitedfun702 Yes. For most residential and small commercial single-phase systems, a 40kA, UC 385V SPD provides adequate protection against common surges caused by lightning or grid disturbances.
If you need enhanced protection (e.g., if you have highly sensitive electronics or you're in a high-risk area for surges), you could opt for a higher kA rating, but 40kA should suffice for general use.
A UC rating of 275V-385V is common for single-phase systems, especially in regions with a 230V nominal voltage (like Sri Lanka and many other countries).
The 385V rating is a good selection and allows the SPD to tolerate short-term overvoltages (which can occur in real-world conditions) without triggering and also without harming any equipment.
However, if you go for lower value for Uc like 275V instead of 385V, SPD will operates unnecessarily to clamp voltage spikes around 300 volts and the lifespan of the SPD will be affected.
Great video information 👍❤ thank you for sharing your knowledge and experience 🇵🇭🫡
Thank you
Really helpful. Thank you so much
Thank you
my requirement is protect appliance from high/low voltage and from lightning which one should I install? Or both?
You have to use both then.
For low voltage protection, separate unit need to be connected.
Yes I really like your design
Thank you
Excellent 👍
Thank you
5:00 This waveform is for a 230V LN (as the case for Europe's electrical standard).
But for a 240V split phase (as in USA and some part of the world), we get two 170V LN waveforms, one being opposite of the other.
Having said that, should n't we use a lower Voltage rated SPD?
In a typical U.S. residential split-phase system, you have:
120V line-to-neutral (LN) voltage from each "hot" line to neutral.
240V line-to-line (LL) voltage between the two "hot" lines.
SPDs are rated based on the maximum continuous operating voltage (Uc) they can withstand. This rating must account for the system's nominal voltage plus any temporary overvoltages that can occur during normal operation.
In a 240V split-phase system, SPDs are often selected based on the line-to-line (LL) voltage (240V), not just the line-to-neutral (LN) voltage (120V), because the SPD needs to handle surges across both "hot" lines.
Why Not Use a Lower Voltage Rated SPD?
Higher Voltage Spikes Across Hot Lines:
Even though each line is 120V LN, surges can often occur between the two lines (L1 and L2), which can result in voltages approaching or exceeding 240V line-to-line (or more during a surge).
Therefore, the SPD must be rated to handle this 240V LL situation, which means a higher voltage SPD is necessary to protect both the line-to-neutral and line-to-line configurations.
Although the system has 120V line-to-neutral (LN) waveforms, the SPD needs to be rated for the 240V line-to-line voltage and potential surges that may exceed that. Using a lower voltage-rated SPD (e.g., 150V or 170V) could result in under-protection, as it might not handle the higher line-to-line surges or temporary overvoltages.
Thus, a higher voltage SPD (e.g., 385V UC) is appropriate for ensuring complete protection in a 240V split-phase system.
For more info, please get the help of a good electrician.
Thanks 👍👍👍
Thank you
This is so confusing! Do I need a type 1 SPD installed if I have a Type 2 installed at the entrance of the circuit? If I do need a Type 1 as well, then can I install it along with the Type 2 (same location)?
If your building is directly connected to an external power line (like overhead power lines), or if it's in an area prone to lightning strikes, it’s advisable to install a Type 1 SPD to handle the larger surges from direct strikes.
A Type 2 SPD alone provides good protection from internal switching surges and indirect lightning strikes, but it’s not designed to handle direct lightning strikes or very high-energy surges that can occur at the main service entrance.
Installation of Type 1 and Type 2 SPDs:
Can they be installed at the same location? Yes! In fact, it’s common practice to install both Type 1 and Type 2 SPDs in the same electrical panel, typically at the main electrical distribution board.
The Type 1 SPD handles the higher energy surge (from a direct lightning strike or external grid surge).
The Type 2 SPD protects against lower-energy residual surges (coming from the Type 1 or switching surges within the building).
They are often installed in a coordinated manner, where the Type 1 SPD acts as the first line of defense, and the Type 2 SPD provides secondary protection.
Thanks for information
Thank you
I'm a electrician of bangladesh,& where you working form.
What if I have a spd with the following rating installed in a 230VAC Line-Line sytem.
Uc =275v , In =20kA Imax=40kA, Up=1.8kV
Approximately how long the spd will fail(turns to red) if the voltage spikes around my power system ranging from 280-380vac?
Since this SPD's maximum continuous voltage reads as 275 volts, 280-380 VAC surges are not a threat to this SPD.
It will last till it reaches critical values, that is "In" for at least 15 times, and "Imax" at least one time.
@@ElectroAcademyEA thanks sir
Helpful
Thank you
how far the spd 3 should be away from spd2?
Ideal separation ensure a minimum of 10 meters (33 feet) of cable length between the Type 2 and Type 3 SPDs for effective coordination.
If the distance is not feasible, needs to consider using inductive coils or combined SPDs to achieve the desired protection.
Proper coordination between SPDs is essential for protecting sensitive equipment, especially in environments where both large surges and small, localized spikes are possible.
Thank u
Thank you
Are there different SPDs for AC & DC?
yes
Yes.
AC and DC SPDs are different, and they are designed to handle the distinct characteristics of AC and DC power systems.
You must select the appropriate SPD based on whether your system is AC or DC, considering the voltage rating, current type, and specific application (e.g., residential AC system or solar DC system).
Why showing 3 phase SPD. Do anybody use 4 pole SPD at home?
Single phase SPDs are there.