Vanguard Instruments

History

An official Vanguard product datasheet states that the company was founded in 1991 and initially developed a computerized extra-high-voltage circuit-breaker analyzer. It says the product line subsequently expanded into micro-ohmmeters, transformer turns-ratio testers, winding-resistance meters, and other diagnostic instruments for transformers, circuit breakers, and protective relays. That account supports a 1991 founding date and an electrical-utility test-equipment identity, rather than the unrelated investment-management or publishing organizations that can appear in broad searches for Vanguard.

Doble Engineering's official acquisition history records that it acquired Vanguard Instruments in 2017 and describes Vanguard as a provider of test equipment whose extra-high-voltage circuit-breaker analyzers expanded Doble's circuit-breaker offerings. Current Vanguard-hosted product pages continue to document circuit-breaker analyzers, contact-resistance micro-ohmmeters, and primary-current-injection equipment. Because the reviewed headquarters evidence comes from older product literature and current legal integration is not fully stated on the pages reviewed, this draft deliberately omits a current headquarters and current ownership field.

Equipment specialties

• circuit-breaker analyzers and timers
• micro-ohmmeters and contact-resistance meters
• transformer turns-ratio and winding-resistance testers
• protective-relay and primary-current-injection test equipment
• electrical utility diagnostic instruments