Author: adminstabil

กรมอุตุนิยมวิทยา เตือน 66 จังหวัด ระวังพายุฝนฟ้าคะนอง

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กรมอุตุนิยมวิทยา” รายงาน “พยากรณ์อากาศ” ระบุ ทั่วไทยตอนบนมีอากาศร้อน กับมีพายุฝนฟ้าคะนอง ลมกระโชกแรง และลูกเห็บตกบางพื้นที่ รวมถึงอาจมีฟ้าผ่า และมีฝนตกหนักเกิดขึ้นได้บางแห่ง
เมื่อวันที่ 6 พ.ค. 64 กรมอุตุนิยมวิทยา รายงานสภาพอากาศประจำวัน ลักษณะอากาศทั่วไปพยากรณ์อากาศ 24 ชั่วโมงข้างหน้า บริเวณความกดอากาศสูงจากประเทศจีนได้แผ่ลงมาปกคลุมภาคตะวันออกเฉียงเหนือของประเทศไทยและทะเลจีนใต้แล้ว ส่งผลทำให้มีลมใต้และลมตะวันออกเฉียงใต้พัดนำความชื้นจากทะเลจีนใต้และอ่าวไทยเข้ามาปกคลุมบริเวณภาคเหนือตอนล่าง ภาคตะวันออกเฉียงเหนือ ภาคกลาง และภาคตะวันออก รวมทั้งกรุงเทพมหานครและปริมณฑล ประกอบกับมีคลื่นกระแสลมฝ่ายตะวันตกจะเคลื่อนจากประเทศเมียนมาเข้าปกคลุมภาคเหนือตอนบนของประเทศไทย

ในขณะที่ประเทศไทยตอนบนมีอากาศร้อน ลักษณะเช่นนี้จะทำให้บริเวณดังกล่าวมีพายุฝนฟ้าคะนอง ลมกระโชกแรง และลูกเห็บตกบางพื้นที่ รวมถึงอาจมีฟ้าผ่า และมีฝนตกหนักเกิดขึ้นได้บางแห่ง ขอให้ประชาชนบริเวณประเทศไทยตอนบนระวังอันตรายจากพายุฝนฟ้าคะนองที่จะเกิดขึ้นไว้ด้วย โดยหลีกเลี่ยงการอยู่ในที่โล่งแจ้ง ใต้ต้นไม้ใหญ่ ป้ายโฆษณาและสิ่งปลูกสร้างที่ไม่แข็งแรง สำหรับเกษตรกรควรเตรียมการป้องกันและระวังความเสียหายที่จะเกิดต่อผลผลิตทางการเกษตรไว้ด้วย

สำหรับอ่าวไทย ภาคใต้ และทะเลอันดามันมีลมตะวันออกเฉียงใต้ และลมตะวันออกพัดปกคลุม ทำให้ภาคใต้มีฝนฟ้าคะนอง และมีฝนตกหนักบางแห่ง

ฝุ่นละอองขนาดเล็กในระยะนี้ประเทศไทยตอนบนมีฝนฟ้าคะนองเกิดขึ้นในบางพื้นที่ จึงทำให้การสะสมของฝุ่นละออง/หมอกควันยังคงอยู่ในเกณฑ์น้อยถึงปานกลาง

Season of the sound 2020

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งาน Season of the sound 2020 วันที่ 4-6 ธ.ค. 63 ณ.ฟอร์จูนทาวน์ ชั้น 2

งานกองแบบแผน กรมสนับสนุนบริการสุขภาพ ที่ชลบุรี

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What’s the Good lightning protection system should be ?

Posted on by adminstabil

What’s the Good lightning protection system should be ?
Answer: The Lightning Protection system can be divided into three major parts as follows:

1. Lightning Air-terminal.
2. Down Conductor / Down Lead.
3. Lightning Ground.

1. Lightning Air-terminal, in the event of lightning strike if we can not stop it form happen actually we want to choose the lightning to be strike at the lightning air-terminal point as for the safety, as the reason we must install the lightning air-terminal at the highest point of the structure as we can, for example install the lightning air-terminal above the highest point of the building structure e.g. TV antenna, radio antenna, water tank and etc and should be at lease 2 meters up above those highest object points (as Stabil standard), the lightning air-terminal should made with the good conductor metal and great withstand with the melting e.g. copper bar, stainless steel bar, tin plated copper bars, or other conductive materials and can also consider by where the lightning air-terminal to be installed e.g. if install near the sea should use materials which can good withstand the corrosion or can consider by budget of the installation and etc.
To install the lightning air-terminal the lightning air-terminal must not has any part to connect with the building structure ( Isolate the system ) this is to mitigate the effects of lightning which may effect to the building and electrical system in the building itself. There should has the sharp points due to the sharp points will have better ability to transfer ions to the air, a good lightning air-terminal should has a diameter not less than 3 / 8 inch, and not less than 10 inches long (standard UL96) in order to be able to handle large amount of the lightning strike currents well.

2. Down Conductor / Down Lead should be conducted with good electrical conductivity wire, melting resistant, such as THW wire, bare copper wire, steel wire or other conductor which has cross-section area not less than 70 mm². (according Stabil standard) and can be determine from the area of installation for example, if near the sea should use material with a good corrosion resistance or considering from the difficulty of installation or the budget of installation and etc.
The wiring of down conductor from the Lightning air-terminal to the lightning ground rod should has the shortest route and as possible, this is as to minimize the Flash over to the side of the building.
Wiring the down conductors should use the Down-lead Support with Ceramic insulators type as to hold the down lead wire to the lightning ground rod with separately from the main building structure.

3. Lightning Ground, as you can see from the previous description on the topic of Deep earth grounding principle works, currently the use of Lightning Air-terminals on the market now there’re many types of them such as the Faraday type, the Early Streamer Emission type, the Radio Active type, the Umbrella type and etc. as experienced STABIL would recommended the Faraday air-terminal type better this is due to the Faraday air-terminal is typically worked well with low cost, the protection angle about 45 degrees (measured from the tip of the air-terminal ) from the past found that when the Faraday air-terminal combined to work together with the deep earth grounding system the efficiency and the angle of lightning protection will be increased much more this is because of the lightning air-terminal can electro-statically exchange the ions between the air and the lightning air-terminal tip better with the a deep grounding system.
To Install the lightning protection systems in every join points from the Lightning Air-terminal through the down conductors down to the lightning ground rods will be connected by using Exothermic Welding (metal meat together) as for the best of huge amount of lightning currents transfer in a very short duration with maximum efficiency, and this will make the less effects of the lightning strike to the building and electrical system as well.

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Can the AC Power Strip in market today can actually help to protect against the Surges?

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Can the AC Power Strip in market today can actually help to protect against the Surges?

Answer: The AC Power strip today which built-in with Surge Protector can help to protect the electrical equipments from surge transient ( short duration surge), but not has the ability to protect against the long duration surge which known as TOVs (Temporary Over Voltages).

As mentioned TOVs is a long duration surge which has the duration about mSec up to a few seconds, which the today Surge Protector technology still can not be able to withstand this type of surge which made the sensitive electrical equipments still to damages due to the TOVs, as of this the Surge Protector you choose should be able to help protect against both Transient ( short duration surge ) and TOVs ( long duration surge ) at the same.

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What’re the Surge Protector features that need to consider?

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What’re the Surge Protector features that need to consider?

Answer: The Surge Protector features which need to consider are as follows :

1. Must be able to protect with both Surge Transient and Temporary Over Voltages (TOVs).
2. Must be responds to the Surge very fast (less than 25 nSec.) as to protect the equipments ( Loads )on time.
3. The working voltage of the Surge Protection (Clamping Voltage) should be in a proper voltage levels, such as between 256 to 315 Volt, 50 Hz.
4. The voltage that appears at the load (Let Through Voltage), while protector operates must be less than 1kv (Test at Transient 6KV / 3KA) and / or less than 285 VAC (Test at TOVs 300 -600 VAC, 50 Hz / 10 – 20 A).

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A long argue about the Franklin Rod VS Early Streamer Emission Lightning Air-terminals.

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A long argue about the Franklin Rod VS Early Streamer Emission Lightning Air-terminals.

Question: As STABIL long experienced in surge protectors and lightning protection system for more than 16 years, there’re a lot of questions asked that has the Early Streamer Emission ESE can actually works as there extreme protection advertisement ? as there price is several times higher than the standard lightning Air-terminal, which type of the lightning air-terminal that the buyers should be select for the lightning protection system which is the most worth than another ?.

Answer: As we known that the Early Streamer Emission lightning air-terminal is the French invented and designed which is academic is not recognize internationally. Actually the basic principles of the lightning air-terminal is just must qualify as a good conductor and well resistance to the corrosion from environments and as basic principle are enough for consider as a good lightning air-terminal.

In STABIL opinion, we should select to buy a standard Franklin Rod lightning air-terminal rather than the high cost of the Early Streamer Emission air-terminal as to save the cost and concentrate invest in making a good deep earth grounding system which will be more worth and cost effective.

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Can the UPS work as a Surge Protector ?

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Can the UPS work as a Surge Protector ?

Answer: The main function of UPS is to power backup the systems, means when the AC power line is failure the UPS will act immediately to supply the voltage for continuing to use the devices (Loads) which is connected behind the UPS. Since the UPS is installed in series with the electrical system and the load has connected behind the UPS, so when Extreme energy of Surge is occurred it can be damage the UPS itself then remain surge energy can also damage the Load which connected behind the UPS as well.
Note: Voltage Stabilizer, Voltage regulator, Line Conditioner are unable to protect the surge with the same working principle as UPS.

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How to choose the Surge Protector ?

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How to choose the Surge Protector ?

Answer: It’s difficult answer because we don’t know when the Surge will be and how strong of the surge will be, but the most common things to consider for choosing the size of the Surge Protector should be as follows :

1. The place of Surge Protector will be installed, for example if the place is in the vulnerable areas or on the open space or on the mountain, there should be consider to select the surge protector with 100KA at 8 / 20 μSec size, but if not in vulnerable area the sizes of surge protector can be 40KA at 8 / 20 μSec.

2. The value of the protected equipments, as well as the indirect value, e.g. the down time of the failure equipments or the loss of revenue or the human risk, in this case need to choose the surge protector with best quality which can also protect the Temporary Over Voltages (TOVs) for example can protect both Transient 100KA at 8 / 20 μSec. And TOVs 10A 3 Sec at the same device.

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