8/12/2019 C.B RATED Current Iec62271-100

1/1

62271-100 IEC:2001 155

Two operating cycles shall be performed for each of the five terminal load tests.

Table 9 Examples of static horizontal and vertical forces for static terminal load test

Rated voltage range Rated current range Static horizontal forceFth

Static vertical force(vertical axis-upward anddownward)

Ur

kV

Ir

A

Longitudinal

FthA

N

Transversal

FthB

N

Ftv

N

52 72,5 800 1 250 500 400 500

52 72,5 1 600 2 500 750 500 750

100 170 1 250 2 000 1 000 750 750

100 170 2 500 4 000 1 250 750 1 000

245 362 1 600 4 000 1 250 1 000 1 250

420 800 2000 4 000 1 750 1 250 1 500

6.102 Miscellaneous provisions for making and breaking tests

The following subclauses are applicable to all making and breaking tests unless otherwisespecified in the relevant clauses.

Where applicable, prior to the commencement of the tests, the manufacturer shall declare thevalues of

minimum conditions of the operating mechanism guaranteeing the rated operating

sequence (for example the minimum functional pressure for operation in case of ahydraulic operating mechanism);

minimum conditions of the interrupting device guaranteeing the rated operating sequence(for example the minimum functional pressure for interruption in case of a SF6 circuit-breaker).

6.102.1 General

Circuit-breakers shall be capable of making and breaking all short-circuit currents,symmetrical and asymmetrical, up to and including the rated short-circuit breaking currents:this is demonstrated, when the circuit-breakers make and break the specified three-phasesymmetrical and asymmetrical currents between 10 % (or such lower currents as specified in6.107.2 if 6.107.1 is applicable) and 100 % of the rated short-circuit breaking current at rated

voltage.

In addition, circuit-breakers intended to be used in an earthed neutral system or for single-pole operation shall make and break single-phase short-circui t currents between 10 % (orsuch lower currents as specified in 6.107.2 if 6.107.1 is applicable) and 100 % of the rated

short-circuit breaking current at phase-to-earth voltage (Ur/3).

Circuit-breakers to which any capacitive current switching rating has been assigned shall becapable of switching capacitive currents up to and including the rated capacitive switchingcurrent at a voltage level up to and including the specified one (see 6.111.7). This isdemonstrated when the circuit-breakers switch the rated capacitive switching current at thespecified test voltage.