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ELECTROLYTIC ALUMINUM CAPACITORS

Revision 09/17

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General technical data

5. SPECIFICATION TO APPLY

Electrolytic aluminum capacitors are defined in :

• NF and UTE French national standard

• CECC European specifications

• IEC international specifications

Quality insurance procedures are described in these specifications.

6. ENDURANCE TESTS / LIFE TIME

6.1. STANDARD ENDURANCE TEST

at max category temperature :

Standard endurance tests do not exceed 2000 hours at 125°C. However, present

EXXELIASICSAFCO technologies concerning liquid electrolytes have led to endurance tests

up to 5000 hours at 125°C (PRORELSIC 125 - FELSIC 125 RS) and even 20000 hours at

125°C (PRORELSIC 145 - ALSIC 145)

6.2. PERFORMANCE REQUIREMENTS ON STANDARD ENDURANCE TESTS.

Permissible capacitance drift ∆C/C (%)

Permissible increase factors on Tan , ESR, Z and Il initial values

(1) Tan or ESR : for initial value, take standard value.

(2) Z : for initial value, take specified value (see data sheet ).

Specific requirements can be taken into consideration with regards to initial values of

dissipation factor or equivalent series resistance and impedance.

French

European

International

Generic specification

Fixed capacitors

NF C 83 100

CECC 30 000

EN 130 000

IEC 60 384 -1

QC 300 000

Sectional specification

Electrolytic aluminum capacitors

NF C 83 110

CECC 30 300

IEC 60 384 - 4

C 300 300

Blank deta Il specification -

Electrolytic aluminum capacitors

with non solid electrolyte /

UTE 83 110

CECC 30 301

IEC 60 384 - 4 -1

QC 300 301

Blank deta Il specifications

CECC 30 301- 017 to

CECC 30 301- 062

CO 31 to CO 55

CECC 30 301- 017 to

CECC 30 301- 062

CECC 30 301- 802 to

CECC 30 301- 811

Temperature

Endurance test

Grade I - Long life

Grade II - General purpose

10 000 h

5 000 h

2 000 h

1 000 h

125°C

•

105°C

•

•

•

85°C

•

•

•

•

UR

Endurance test

Grade I

Grade II

10 000 h

5 000 h

2 000 h

1 000 h

6,3 V

+15 –30

+25 –40

10 V - 35 V

+15 –20

±15

±15

±30

40 V - 160 V

±15

±15

±15

±30

> 160 V

±15

±10

±10

±15

Endurance test

Grade I

Grade II

10 000 h

5 000 h

2 000 h

1 000 h

Tan or ESR (1)

1,5

1,3

1,3

1,5

Z (2)

3

2

2

3

Il

Standard values

6.3. FAILURE CRITERIA FOR ELECTROLYTIC CAPACITORS.

Failure criteria are defined in CECC 30 301

• Non measurable defaults leading to complete failure.

• Measurable defaults leading to adjustment losses of the load circuit

(failure due to variations).

6.3.1. Non measurable defaults.

They might be summed up as :

• Open circuit

• Short circuit

• Operation of pressure relief device

• Severely damaged insulation

• Unusable terminations

6.3.2. Measurable defaults.

Variations exceeding the values given below characterize a default.

• Capacitance drift ∆C/C (%) : 3 times the limit for standard endurance

testing or 50 % (whichever is the smallest).

• Tan or ESR : 3 times standard max initial values.

• Z : 3 times standard max initial values.

• Il : initial limit (under load conditions).

Specific requirements can be taken into consideration with regards to lower drifts.

6.4. INFLUENCE OF MAIN PARAMETER ON OPERATIONAL LIFE.

6.4.1. Temperature.

The capacitors operational life is highly dependent upon its internal temperature i

and therefore upon the ambient temperature and the ripple current.

Knowing ESR and dissipated power values (§ 6.4.3.) one can figure out, the internal

temperature rise and then determine the capacitors expected life.

With present high bo Iling point electrolytes (§ 8.6)

i max = 125 to 185°C depending on styles.

6.4.2. Ripple current.

The ripple current flowing through the capacitor increase the internal temperature

through power dissipation.

Standards define the permissible current at 100 Hz and generally consider a

temperature rise of 5 to 10°C of max category temperature.

Current waveforms and frequencies make it difficult to clearly determine the

capacitors internal temperature rise, which defines the operationally life.

Experiments confirm following relationship :

i = a + ( c - a) K

Where :

• i = Internal hot spot temperature

• a = Ambient temperature

• c = Case temperature

• K = Parameter depending upon case diameter and cooling

Ø ≥ 51 k = 2 ±0,5

Ø < 51 k = 1,5 ±0,5

(air cooling - 0,2 m/s)