by Rocket Web | Feb 10, 2026 | Acceptance Testing
Power Quality Problems Are Event Problems A voltage sag may last less than a second and still stop a drive, reset a controller, or interrupt a process. Harmonics can add heating without creating an obvious alarm. Voltage unbalance can affect motors while average...
by Rocket Web | Feb 10, 2026 | Transformer Maintenance
Dry Does Not Mean Maintenance-Free Dry-type transformers avoid the oil-system concerns of liquid-filled units, but they still operate under thermal, electrical, mechanical, and environmental stress. Dust, blocked ventilation, loose connections, harmonic loading,...
by Rocket Web | Jan 19, 2026 | Acceptance Testing
What the Ratio Test Checks Transformer turns ratio testing compares the relationship between primary and secondary windings with the expected ratio for the selected tap position. It also helps confirm polarity or phase relationship, depending on the transformer and...
by Rocket Web | Jan 19, 2026 | MCC Testing
MCC Problems Reach the Process Quickly A motor control center is where electrical distribution meets production equipment. A weak bus connection, failing starter, incorrect overload, damaged bucket, or control-power problem can stop a pump, fan, conveyor, compressor,...
by Rocket Web | Dec 1, 2025 | Resistance Testing
Why Milliohms Matter A high-current connection can look clean and tight while its effective contact area is reduced by wear, oxidation, contamination, poor alignment, or insufficient pressure. Even a small increase in resistance can create additional heat and voltage...
by Rocket Web | Dec 1, 2025 | Resistance Testing
The Test Looks Simple, but the Context Is Not An insulation resistance test applies a dc voltage between conductors or between a conductor and ground, then measures the very small leakage current. The result is expressed as resistance, commonly in megohms or gigohms....
by Rocket Web | Nov 9, 2025 | Cable Testing
What Partial Discharge Means in a Cable System Partial discharge is localized electrical activity within or around insulation that does not completely bridge the conductors. In installed cable systems, activity may be associated with insulation defects, joints,...
by Rocket Web | Nov 9, 2025 | Cable Testing
Start With the Question, Not the Test Set Medium-voltage cable testing can be a withstand test, a diagnostic test, or a combination of both. The right method depends on whether the cable is new or service-aged, shielded or unshielded, extruded or laminated, recently...
by Rocket Web | Oct 15, 2025 | Switchgear Testing
Why Switchboards Become a Single Point of Concern A main switchboard may serve most of a commercial building’s load. Problems at the service entrance, main bus, feeder breakers, metering, or ground-fault protection can affect tenants, life-safety systems,...
by Rocket Web | Oct 15, 2025 | Relay Testing
A Relay Can Pass While the Scheme Still Fails Protective relays make decisions from current, voltage, timing, logic, and communications. A bench or secondary-injection test can show that a relay element responds correctly, but that result alone does not prove the...
