參數(shù)資料
型號: 70109518.55
英文描述: 8th-Order, Lowpass, Bessel, Switched-Capacitor Filters
中文描述: 保險絲
文件頁數(shù): 52/65頁
文件大?。?/td> 2586K
代理商: 70109518.55
Schurter, Inc. Phone 707-778-6311 Fax 707-778-6401 E-mail: info@schurterinc.com Website http://www.schurterinc.com
158
Surge Tolerant Fuses
Application Notes
Introduction
Telecommunication equipment acts as a source for data
exchange between subscribers. Communication takes place in
various ways, e. g. telephone, FAX etc.
Interference by induction (Power Induction)
Induction voltages occurring as interference on telecom
lines are usually a result of circulating or equalizing currents
in the earth or are produced by strong currents in adjacent
power cables.
EXCHANGE
SUBSCRIBER
EXCHANGE
Distances between individual subscribers (man, machine) can
vary significantly thereby subjecting network connections
(overhead lines, signal cables) to various interferences caused
by:
q
Atmospheric interference, (lightning strike, switching
operations)
q
Interference by power induction (equalizing currents,
vicinity of power cables)
q
Direct contact with energy network (short-circuits)
Interference sources
Atmospheric interference (Lightning Strike)
Interference due to lightning strikes occurs frequently on
exposed overhead telephone lines. Voltages as a result of this
atmospheric discharge can be 100 kV with discharge currents
up to 150 kA.
SUBSCRIBER
EXCHANGE
LIGHTNING STRIKE
SUBSCRIBER
TEL.-LINE
POWER LINE
EXCHANGE
Direct contact with the power network (Power Contact)
SHOR T-CIRCUIT
POWER CABLE
SUBSCRIBER / EXCHANGE
Interference of unusually high intensity and long duration (a
few seconds to several minutes) on a telephone line occurs
when there is direct contact with a power network (e.g. short-
circuit with an adjacent power cable).
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