ECA 181-1957 Iron Core Charging Inductors《铁芯充电感应器》.pdf
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1、RETMA STANDARD Iron Core Chargng Inductors RS-181 (Revision of TR-127) I March 1957 Engineering Department RADIO-ELECTRONICS-TELEVISION MANUFACTURERS ASSOCIATION r 1 EIA LBL 57 3234600 0028539 O 4 NOTICE RETMA standards are adopted in the public interest and are designed to eliminate misunder- stand
2、ings between the manufacturer and the purchaser and to assist the purchaser in selecting and obtaining without delay the proper product for its particular need. Existence of such stand- ards does not in any respect preclude any member or non-member of RETMA from manufacturing or selling products not
3、 conforming to the standard. Any proposal of recommended standards and practices made by the Association is without any regard to whether or not their adoption may in any way involve patents on articles, materials or processes. By such action, the Association does not assume any liability to any pat
4、ent owner, nor does it assume any obligation whatever to parties adopting the recommended standards or practices. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, NOW., Washington, D. C. 20006 Electronic Industries Association 1971 All rights reserved .Price $2.
5、20 Printed In U.RA. EIA 181 57 m 3234h00 0028540 7 m RS-I81 Page 1 IRON CORE CHARGING INDUCTORS (From Standard TR-127 and Stamlards Proposal No. 514 formulated utzder the cognizance of RETMA ErvginserZng Committee SQ-4 on Trarcsf owners and Inductors) 1. SCOPE This standard covers iron core charging
6、 reactors for use in radar transmitters and similar equip- ment where long life, reliability and continuity of operation is essentiai. 2. DEFINITIONS Definitions of electrical terms used in this standard shall be in accordance with those given in “American Standard Definitions of Electrical Terms”-A
7、SA Standard C42-1941. Definitions of electrical terms used in this standard, but not covered by ASA Standard C42-1941, are given below: 2.1 Charging Inductor A charging inductor is an inductor placed in the charging circuit of a pulse forming network. Because of the oscillatory nature of the chargin
8、g, network capacitance ia charged to almost double the power supply voltage, at which time the switch shunting the network conducts, discharges the network and develops a pulse across the load of the modulator. 2.2 Pulse Repetition Frequency (PRF) Pulse repetition frequency (PRF) ia the number of ti
9、mes per second the pulse is transmitted. 2.3 Resonant Frequency of Charging (fB) Resonant frequency of charging reactor inductance and network capacity as determined by 2.4 Resonant Charging Resonant charging occurs when the switch starts to conduct at the peak of the sine wave of voltage across the
10、 network. fa should approximately equal - PRF for this condition. In linear charging, the switch starta to conduct while the voltage across the network condenser is still rising. fR should be leas than - PRF for this condition. 2 2.5 Linear Charging 2 2.6 Resonant Charging with a Charging Diode A di
11、ode is placed in series with the charging inductor with its plate connected to the high voltage side of the inductor and its cathode connected to the wmmon junction of the switch and the pulse forming network. The network charges to full voltage, remains there until the switch conducts, and permits
12、operation at PRFs less than Zf,. 2.7 Graded Insulation Graded insulation is a method of construction wherein the insulation to ground is reduced more or less uniformly from the high potential end to the low potential end. It is applicable to charging inductors where one end is permanently connected
13、to a fixed potential while the other end may swing to essentialy double this Axed potential. 2.8 RMS Working Voltage The “RMS working voltage” between the winding and ground shall be defined as 0.707 times the sum of the maximum d-c voltage and the peak a-c voltage which may appear between the wind-
14、 ing and ground under normal conditions of continuous operation. 2.9 Average Current (kc) This is the current drawn from the power supply over one or more complete cycles. EIA 181 57 3234600 0028541 9 RS-18 1 Page 2 3. PURCHASE SPECIFICATIONS The purchaser will specify 3.1 Electrical Features 3.1.1
15、The rated value of inductance at approximately 25C. (a) Permissible variation of inductance over frequency, voltage and current range of the appli- cation, as specified in 3.1.2, 3.1.3, and 3.1.4. NOTE: If no variation in ide is specified, the inductance measured at $42 Ide shall not differ from the
16、 inductance measured at Idc by more than 20 percent. (b) Taps and tap tolerance. 3.1.2 Type of charging desired (resonant, linear, or resonant with a charging diode) and the pulse repetition frequency or frequencies. 3.1.3 Peak, RMS and average current for each frequency specified in 3.1.2. 3.1.4 Ma
17、ximum operating voltage at all terminals. 3.1.5 The modulator circuit diagram, complete with component values and, operating conditions including losses, may be given instead of the voltages and currents in 3.1.3 and 3.1.4. 3.2 Construction Features 3.2.1 General Assembly: (For example: non-encased
18、core and coils, end bell, sheet metal enclosed, dry or liquid filled, or hermetically sealed). NOTE : In specifying construction, cognizance should be taken of requirements imposed by 3.1.4, 3.3.2, 3.3.4, 3.4, 4.3, and 4.4. 3.2.2 Terminals, (For example : leads, screw studs or soldering lugs). 3.2.3
19、 Mounting, (For example : terminal end or opposite end). 3.2.4 Limiting dimensions and weight. 3.3 Conditions of Operation 3.3.1 Maximum ambient temperature for continuous operation. 3.3.2 Maximum altitude if more than 6000 feet above sea level. 3.3.3 Unusual requirement or operating conditions such
20、 as intermittent operation. 3.3.4 Special conditions, such as ability to withstand vibration. (a) Unless otherwise specified, the ambient temperature shall be assumed to be 60C. 3.4 Other specifications with which the inductor must comply (Army, Navy, etc.). 4. PERFORMANCE STANDARDS 4.1 When tested
21、under standard conditions as described in 7.1, the maximum temperature rise of the inductor winding shall not exceed the limit for the class of insulation used, as defined by the latest issue of AIEE Standard No. 1. Unless other classes are specifically agreed upon between purchaser and manufacturer
22、, class A insulation shall be used. 4.2 Winding Voltage. The winding shall be insulated so as to withstand the DC voltage at one terminal, twice the DC voltage at the other, and an AC voltage across the winding of peak value equal to the DC voltage. The high voltage end of the inductor winding shall
23、 be designed to with- stand the voltage produced in actual operation as specified in 3.1. 4.3 Unless otherwise specified, inductors shall be so constructed as to successfully pass the Mois- ture Resistance Tests of 8. 4.4 Unless otherwise specified, Magnitude of Corona shall be within the limits tab
24、ulated in 9. - r. EIA 181 57 3234600 0028542 O E RS-181 Page 3 5. PERFORMANCE TESTS e 9.1 Indiictance Tekt The inductance shall be measured in a suitable circuit, with the greatest value of average current, the maximum voltage, and the corresponding frequency fn specified in 3.1. If desired, a highe
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