Authorities say a faulty electric transformer may have caused the explosion, ruling out an 'attack' against civilians. A blast at a supermarket in the northwestern Mexican state of Sonora has killed at least 23 people, including children, and wounded at least 11, according to. A supermarket explosion killed at least 23 people in northern Mexico yesterday, according to local officials, with investigators saying the blast was an accident possibly caused by a faulty electric transformer. — AFP pic Stay updated on the latest news and insights. The. A substation explosion can trigger a major power outage, release plumes of smoke, and damage transformers. They can escalate locally within milliseconds and—depending on grid configuration and protection coordination—may propagate into wider outages. In this blog. Causes of Failure There are two fundamental causes of failure of electrical equipment you should differentiate: mechanical failure or electrical failure of insulation. The majority of circuit breaker failures.
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