GB/Z 32513-2016General rules of reliability for low voltage apparatus (English PDF)

3.1 Terms and definitions

The terms and definitions as defined in GB/T 2900.13-2008, GB/T 2900.18-

2008, GB/T 5080 (all parts), GB 10963.1-2005, GB 10963.2-2008, GB 14048.1-

2012, GB 14048.2-2008, GB 14048.4 -2010, GB 14048.5-2008, GB 14048.6-

2008, GB 16916.1-2014, GB 16917.1-2014 and the following apply to this

document.

3.1.1

Reliability

It refers to the ability of the product to complete the specified function within

the specified conditions and within the specified time.

3.1.2

Failure rate

It refers to the probability of failure of the product within the unit time after

working to the time t.

3.1.3

success ratio, the residual current protection success ratio after the

environmental test, the short circuit protection success ratio, and the overload

protection success ratio as the reliability characteristic quantity.

4.1.2 Reliability leveling of the residual current operated circuit breakers

for household and similar purposes

It respectively uses the operation failure rate level, the residual current

protection success ratio, the success ratio of the residual current protection

after the environmental test, the short circuit protection success ratio, and the

overload protection success ratio as the reliability indicators.

Based on the value of the maximum failure rate lambdamax, the operation failure rate

level is divided into four levels (level 4, sub-level 4, level 3, and sub-level 3).

Based on the value of the unacceptable success ratio R1, the residual current

protection success ratio is divided into four levels (level 6, level 5, level 4, and

level 3), the success ratio of residual current protection after the environmental

test is divided into four levels (level 6, level 5, level 4, and level 3), the short

circuit protection success ratio is divided into four levels (level 6, level 5, level

4, and level 3), AND the overload protection success ratio is divided into four

levels (level 5, level 4, level 3, and level 2).

4.2 Reliability indicators for overcurrent protection circuit breakers for

household and similar purposes

4.2.1 Reliability characteristic quantity of overcurrent protection circuit

breakers for household and similar purposes

The overcurrent protection circuit breaker for household and similar purposes

uses the operation failure rate (lambda), the short-circuit protection success ratio, and

the overload protection success ratio as its reliability characteristic quantity.

4.2.2 Reliability leveling of overcurrent protection circuit breakers for

household and similar purposes

It respectively uses the operation failure rate level, the short-circuit protection

success ratio level, and the overload protection success ratio as the reliability

indicators.

Based on the value of the maximum failure rate lambdamax, the operation failure rate

level is divided into four levels (level 4, sub-level 4, level 3, and sub-level 3).

Based on the value of the unacceptable success ratio R1, the short circuit

protection success ratio is divided into four levels (level 6, level 5, level 4, and

level 3), AND the overload protection success ratio is divided into four levels

(level 5, level 4, level 3, and level 2).

The small capacity AC contactor uses the operation failure rate (lambda) as its

reliability characteristic quantity.

4.5.2 Reliability leveling of small capacity AC contactors

Based on the value of the maximum failure rate lambdamax, the failure rate is divided

into six levels (level 7, sub-level 7, level 6, sub-level 6, level 5, and sub-level 5),

AND it is used as the reliability indicator.

6.1 Reliability verification test plan

The reliability verification test plan is as follows.

a) As for the reliability verification test, it is recommended to use the time or

failure curtailed tests;

b) As for the reliability verification test, the consumer's risk beta is taken as 0.1;

c) As for the reliability test sampling plan, it is selected in accordance with

the specific product reliability test standard sampling plan table.

6.2 Reliability verification test procedure

6.2.1 Failure rate verification test procedure

The failure rate verification test is conducted in accordance with the following

procedure.

a) SELECT the failure rate level of the product;

b) SELECT the allowable failure number Ac and the curtailed failure number

rc (rc = Ac + 1);

c) Based on the selected failure rate level and Ac, from the failure rate

verific...

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