IPC-TM-650 EN 2022 试验方法.pdf - 第567页

1.0 Scope This method describes a procedure for deter- mining the ability of rigid insulating materials to resist break- down parallel to laminations (or in the plane of the material) when subjected to extremely high vol…

IPC-TM-650

Number Subject Date

Revision

Page 7 of 7

2.5.5.15 Relative Permittivity and Loss Tangent Using a 06/22

Split-Post Dielectric Resonator

N/A

5.3.10 If another test frequency is selected, change the SPDR test fixture in accordance with the test frequency. Then repeat

steps 5.3.2 through 5.3.9.

6 Report

6.1 For room temperature tests, report the following:

6.1.1 Test environment (temperature, humidity);

6.1.2 Test frequency;

6.1.3 Report the values and the average values of the relative permittivity and loss tangent at test frequency;

6.1.4 The preconditioning of the specimen;

6.1.5 Any anomalies in the test or variations from this test method.

6.2 For variable temperature tests, report the following:

6.2.1 Test temperature (T) and base temperature (T

ref

);

6.2.2 Test frequency;

6.2.3 Dk(T)and Df(T)at test temperature (T);

6.2.4 TC

and TC tan

;

6.2.5 Dk(T

ref

) and Df(T

ref

);

6.2.6 If more than one test temperature is necessary, report the curve diagram of the relative permittivity and loss tangent in

accordance with the temperature variation ;

6.2.7 The preconditioning of the specimen;

6.2.8 Any anomalies in the test or variations from this test method.

7 Notes

7.1 Accuracy of measurements of a sample of thickness h.

7.2 Permittivitymeasurement:Δ

=±[0.0015+Δh/h].

7.3 Losstangent:Δtan

= ±2 × 10

−5

or ±0.03 × tan

whichever is higher.

7.4 Clean test heads, standard materials and fixtures regularly.

7.5 To prevent damage to the test fixture because of the variable temperature tests, verify the test system regularly with a

standard reference sample. For example, single-crystal quartz is used as standard reference sample of thickness 0.4 mm.

The deviation of the relative permittivity measurement between the test result and the nominal value of the standard

reference sample shall be less than ± 0.7 %, while the deviation of the loss tangent shall be less than ± 2 × 10

−5

1.0

Scope

This

method describes a procedure for deter-

mining the ability of rigid insulating materials to resist break-

down parallel to laminations (or in the plane of the material)

when subjected to extremely high voltages at standard AC

power frequencies of 50-60Hz.

As for most electrical properties, values obtained on most

materials are highly dependent on the moisture content and

tests using different conditioning cannot be compared. Tests

in other mediums, e.g., air are generally impractical due to its

relatively low breakdown.

This method is based on the test technique described as

ASTM D229.

2.0

Applicable documents

ASTM D229

Standard

Method of Testing Rigid Sheet and

Plate Materials Used for Electrical Insulation

ASTM

D149

Standard

Test Method for Dielectric Breakdown

Voltage and Dielectric Strength of Solid Electrical Insulating

Materials at Commercial Power Frequencies

3.0

Test Specimens

3.1 Number

Four

specimens shall be tested. When speci-

fied, two shall be in the machine direction and two in the

transverse direction for reinforced materials.

3.2

Form

Specimens

shall be approximately 3.0 inch X 2.0

inch X thickness and shall be prepared by shearing or sawing

the specimen from the test sample. Two holes 0.188 inch in

diameter are to be drilled along the center line of the 3.0 inch

dimension and midway between the edges in the 2.0 inch

dimension, with a spacing of 1.0 inch ± .01 inch center to

center.

3.3

Location

The

specimens may be cut from any location

in the sheet (except from the outer 1.0 inch of full size sheets).

3.4

Foil Clad Material

Foil

clad material shall have all

metal cladding removed by etching and shall be thoroughly

cleaned prior to conditioning or testing.

4.0

Apparatus/Materials

4.1

High

voltage breakdown tester (generally 50KV mini-

mum) with current rating of .5KVA up to 10KV and 5KVA

above 10KV and a motorized control capable of a 500 volts/

second rate of rise.

4.2

Oil

tank filled with insulating oil

capable

of exceeding

the requirements of the specification.

4.3

Tapered

pin electrode fixture utilizing two American

Standard #3 pins. (Note spherical ends on the pins are per-

mitted and recommended to reduce likelihood of breakdown

in the oil.)

4.4

High

voltage test leads (leads rated in excess of machine

capacity are recommended).

4.5

Constant

temperature water bath, capable of 50°C ±

2°C, filled with distilled water.

4.6 Beaker

or pan filled with ambient temperature distilled

water.

4.7

Racks

for supporting specimens in the 50°C water bath

(with all specimen surfaces exposed).

4.8

Timer

0-60 seconds.

4.9

Lint

free paper towels.

5.0

Procedure

5.1 Preconditioning

Unless

otherwise specified the speci-

men shall be conditioned for 48 hours (+2 hours –0 hours) in

distilled water maintained at 50°C ± 2°C.

Following this step the specimen shall be immersed in ambi-

ent temperature distilled water for 30 minutes minimum, 4

hours maximum, to allow the specimens to achieve tempera-

ture equilibrium without a substantial change in moisture con-

tent.

Insulating Oil: Transfer oil such as Shell Dial Ax may be used. Use of dibutyl phthalate is acceptable but it may cause failure of the adhesives used for plastic

tanks.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.5.6

Subject

Dielectric

Breakdown of Rigid Printed Wiring

Material

Date

5/86

Revision

Originating Task Group

N/A

Material

in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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5.2

Test Condition

The

test shall be performed at ambient

temperature (23°C ± 5°C). Relative humidity is not significant

as the tests are performed under oil.

5.3

Equipment Set Up

5.3.1

Adjust

the transformer on the high voltage tester

(manually for most models) to the position which will allow for

the necessary voltage to be achieved with adequate current

capacity for breakdown.

5.3.2

Set

the machine for testing using a 500 volt per sec-

ond rate of rise.

5.4

Test

5.4.1

Remove

a preconditioned specimen from the ambient

temperature water and wipe dry with a lint free paper towel.

5.4.2 Insert

the first specimen into the fixture (inserting the

tapered pins from opposite sides) and immerse in the oil bath.

5.4.3

Attach

leads (if not permanently wired) so that one

high voltage lead is connected to one tapered pin electrode

and the ground lead is connected to the other tapered pin

electrode.

5.4.4

Operate

the tester such that the voltage is applied with

a 500 volts per second rate of rise and observe the specimen

until an electrical breakdown occurs.

5.4.5

Record

the voltage at which breakdown occurs, using

the meter memory device if available.

Note:

the breakdown

appears to be in the oil and no specimen damage is obvious

it is recommended that the same sample be retested. If the

specimen still will not breakdown due to breakdown of the oil,

the oil should be filtered or replaced.

5.4.6

Determine

the starting voltage and steps for the

remaining specimens from the same sample from Table 1.

5.4.7

Change

the high voltage tester to manual (or pro-

grammed stepped) operation, remove a specimen from the

water bath, wipe dry, and insert the second specimen.

5.4.8

Set

the voltage to the 50% value (plus or minus the

value of one step) and apply the voltage for 60 seconds.

5.4.9 If

no breakdown occurs increase the voltage in steps

per Table 1 until the material breaks down or the breakdown

capacity of the machine or oil is reached. Record the break-

down voltage to the nearest kilovolt or record ‘‘N. B.’’ if there

is no breakdown of the material.

Note:

the minimum value

required by the material specification is not exceeded, but

material breakdown does not occur, it is necessary to replace

or filter the oil.

5.4.10

Repeat

steps 5.4.7-5.4.9 for the remaining speci-

mens from the sample.

5.5

Calculation

5.5.1

Average

the values for the three specimens tested

using the stepped technique and round to the nearest kilovolt.

Even if some specimens do not break down, the maximum

individual voltages will be used to calculate an average.

Note:

the accuracy of the meter on the machine is not within 5%

for all values in the range, apply a correction obtained from the

last machine calibration to each reading to determine the

actual value for the dielectric breakdown.

5.6

Report

5.6.1

Report

the average value of the dielectric breakdown

(if all specimens actually breakdown), e.g., 85KV average.

5.6.2

Report

the average with a plus after the value if one or

two specimens do not break down, e.g., 82 + KV average

2NB.

5.6.3

Report

the minimum value at which the oil broke

down, if no actual specimen breakdowns are obtained, e.g.,

75 + KV N.B.

5.6.4

Report

any anomalies in the test or any variations from

prescribed procedures or tolerances.

6.0 Notes

able 1 Voltage increments for Step by Step Test

Breakdown

Voltage (KV) Increment KV

less than 12.5 0.5

over 12.5 to 25 1.0

over 25 to 50 2.5

over 50 to 100 5

over 100 10

IPC-TM-650

Number

2.5.6

Subject

Dielectric

Breakdown of Rigid Printed Wiring Material

Date

5/86

Revision

age2of3

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