Hitachi Relion 650 Series Technical Manual page 299

1MRK 511 557-UEN Rev. A
IEC19000916 V1 EN-US
Figure 135: Re-strike/re-ignition of breaker
During CB tripping, after the primary contact of the breaker separates, the current continues through
an electrical arc until natural current zero. During that time period, the potential dielectric strength of
the contact gap gradually increases while the CB is still conducting. After initial interruption, the CB
will re-ignite/re-strike if the TRV (voltage across breaker contacts after current interruption) exceeds
the actual dielectric strength, which in turn depends on the time since contact separation and
correspondingly arcing time. For example, in case of capacitive load, re-strikes may occur due to
trapped voltage on the load as shown in
Technical Manual
Figure 136.
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Re-strike/
Re-ignition
Time
IEC19000916-1-en.vsdx
Section 12
Monitoring
293