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參數(shù)資料
| 型號： | P2500L |
| 英文描述： | MCU CMOS 80 LD 33MHZ 8K EPRM, -40C to +85C, 80-TQFP, TRAY |
| 中文描述： | 搖臂夾具 |
| 文件頁數(shù)： | 188/212頁 |
| 文件大?。?/td> | 1877K |
| 代理商： | P2500L |
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Telecommunications Protection
http://www.teccor.com
+1 972-580-7777
5 - 26
2002 Teccor Electronics
SIDACtor
Data Book and Design Guide
Telecommunications Protection
Because early telecommunications equipment was constructed with components such as
mechanical relays, coils, and vacuum tubes, it was somewhat immune to lightning and
power cross conditions. But as cross bar and step-by-step switches have given way to more
modern equipment such as digital loop carriers, repeater amplifiers, and multiplexers, an
emphasis has been put on protecting this equipment against system transients caused by
lightning and power cross conditions.
Lightning
During an electrical storm, transient voltages are induced onto the telecommunications
system by lightning currents which enter the conductive shield of suspended cable or
through buried cables via ground currents.
As this occurs, the current traveling through the conductive shield of the cable produces an
equal voltage on both the Tip and Ring conductors at the terminating ends. Known as a
longitudinal voltage surge, the peak value and wave-form associated with this condition is
dependent upon the distance the transient travels down the cable and the materials with
which the cable is constructed.
Although lightning-induced surges are always longitudinal in nature, imbalances resulting
from terminating equipment and asymmetric operation of primary protectors can result in
metallic transients as well. A Tip-to-Ring surge is normally seen in terminating equipment
and is the primary reason most regulatory agencies require telecom equipment to have
both longitudinal and metallic surge protection.
Power Cross
Another system transient that is a common occurrence for telecommunications cables is
exposure to the AC power system. The common use of poles, trenches, and ground wires
results in varying levels of exposure which can be categorized as direct power cross, power
induction, and ground potential rise.
Direct power cross occurs when a power line makes direct contact to telecommunications
cables. Direct contact is commonly caused by falling trees, winter icing, severe
thunderstorms, and vehicle accidents. Direct power cross can result in large currents being
present on the line.
Power induction is common where power cables and telecommunications cables are run in
close proximity to one another. Electromagnetic coupling between the cables results in
system transients being induced onto the telecommunications cables, which in turn can
cause excessive heating and fires in terminal equipment located at the cable ends.
Ground potential rise is a result of large fault currents flowing to Ground. Due to the varying
soil resistivity and multiple grounding points, system potential differences may result.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| P2500M | 制造商:SEMIKRON 功能描述:DIODE RECTIFIER 25A 1000V AXIAL |
| P2500MTL | 制造商:SEMIKRON 制造商全稱:Semikron International 功能描述:Standard silicon rectifier diodes |
| P2500PR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PRESS MANUAL ASSEMBLY |
| P2500Q12ALRP | 功能描述:硅對稱二端開關(guān)元件 230V 50A QFN 3X3 2L SIDACtor Bi RoHS:否 制造商:Bourns 轉(zhuǎn)折電流 VBO:40 V 最大轉(zhuǎn)折電流 IBO:800 mA 不重復通態(tài)電流: 額定重復關(guān)閉狀態(tài)電壓 VDRM:25 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）: 保持電流（Ih 最大值）:50 mA 開啟狀態(tài)電壓:5 V 關(guān)閉狀態(tài)電容 CO:120 pF 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AA |
| P2500Q12BLRP | 功能描述:硅對稱二端開關(guān)元件 230V 100A SIDACtor Bi RoHS:否 制造商:Bourns 轉(zhuǎn)折電流 VBO:40 V 最大轉(zhuǎn)折電流 IBO:800 mA 不重復通態(tài)電流: 額定重復關(guān)閉狀態(tài)電壓 VDRM:25 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）: 保持電流（Ih 最大值）:50 mA 開啟狀態(tài)電壓:5 V 關(guān)閉狀態(tài)電容 CO:120 pF 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AA |
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