SPD for Power Supply System Series Selection Guide
The installation of SPD at each lightning protection zone, according to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category, its insulation withstand impulse voltage level can determine the selection of SPD. According to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category as signal level, loading level, distribution and control level, power supply level. Its insulation withstand impulse voltage level are:1500V,2500V,4000V,6000V. As per to the protected equipment installation position different and the different lightning current of different lightning protection zone, to determine the installation position of SPD for power supply and the break-over capacity.
The installation distance between each level SPD should not more than 10m, the distance between SPD and protected equipment should as short as possible, not more than 10m. If due to limitation of installation position, can't guarantee the installation distance, then need to install decoupling component between each level SPD, make the after class SPD can be protected by the prior class SPD. In the low voltage power supply system, connecting an inductor can achieve the decoupling purpose.
SPD for power supply system specification selection principle
Max. continuous operating voltage: bigger than protected equipment, the system's max. continuous operating voltage.
TT System: Uc≥1.55Uo (Uo is low voltage system to null line voltage)
TN System: Uc≥1.15Uo
IT System: Uc≥1.15Uo(Uo is low voltage system to line voltage)
Voltage Protection Level: less than the insulation withstand impulse voltage of protected equipment
Rated discharge current: determined as per to the lightning situation of the position installed and lightning protection zone.
SP1 Series
Normal Working Conditions
-Altitude not exceed 2000m
-Ambient air temperature:
Normal range: -5ºC~+40ºC
Extend range: -40ºC~+80ºC
-Relative Humidity: 30% - 90% under indoor temperature condition
- At the place without obviously shaking and shock vibration
- Non-explosion danger medium, non-corrosion gas and dust ( including conductive dust)
Classification
-As per Nominal Discharge Current:
5,10,20,30,40,60KA(8/20µs)
- As per Maximum continuous operating voltage:
275V,320V,385V,420V,440V,460V
- As per to poles
1P,1P+N,2P,3P,3P+N,4P
- As per auxiliary functions:
a. With remote signal output ( remote alarm function)
b. Without remote signal output
Selection Principle
- The continuous applied voltage on the two terminals of SPD should not more than the maximum continuous operating voltage Uc value;
- The voltage protection level Up of SPD should less than the maximum impulse withstand voltage of the protected equipment;
- As per to the different earthing system and protection mode to select the specification accordingly;
SP1-NPE Neutral earthing surge protection
Application
SP1-NPE Neutral earthing protection module ( brief as NPE) suitable for TT,TN-S power supply system with AC 50/60Hz, rated voltage 400V, used between Neutral line and Earthing line, make surge protection caused by indirect lightning and direct lightning or other instant over voltage. And can assembly with SP1-C, SP1-D series SPD to form the combination of 1P+NPE, 3P+NPE etc., as to improve the anti-surge performance.
Structure Features
NPE use gas discharge tube or air gap discharge as main execute component, normally it shows high resistance status, when there is surge in power grid due to indirect and direct lightning or other instant over voltage, the electrode will breakover within nanosecond grade time, to lead the surge to earth, and protect the electric equipment in the power grid, after the surge across NPE, it recover to high resistance status again, and no influence to the normal running of power grid.
Radin Electric provides ATS design, engineering, and full after sales support for a wide range of automatic transfer switch applications. We offer onsite electrical audits to assist in determining the correct product and installation to meet your exact needs and requirements.
Dlivery Terms
Shipment & Express & Air express
About the Company
We've got CE, TUV, KEMA, CCC certificate for ATS which also meets the ISO9001 standard and the factory has go through SGS test.
FAQ:
1. What's the warranty term?
24 Monthes.
2.How long does it take to deliver my goods?
Normally, samples can be delivered in 2 days. Customer designed sampleswill be delivered in 3-7 days.
3. Do you offer sample?
Yes, we offer sample order for customer to test the goods.
4. What kinds of payment terms do you accept?
We offer kinds of payment ways foe customer to chose from. T/T,L/C,Aliexpress,Western union etc.
5. What if there's quality peoblem?
We offer replacement for the goods as soon as there is a quality problem with the goods, and the fright is on our account to cut down the customer's loss to the lowest.
We are sure any of your questions will get our prompt reply, just leave the message!
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