Quality Judgment: Six Steps to Verify Authenticity
Judging the quality of power equipment (switchgear, transformers, circuit breakers, components) cannot rely solely on brand and appearance. It requires verification through six steps: “certificate → testing → components → workmanship → performance → acceptance.” Industry insiders point out that the core of “how to judge the quality of power equipment” is the chain of evidence—each quality link must have verifiable written and physical evidence;
only a complete chain of evidence indicates qualified equipment.
Six-Step Judgment Method
- Step 1: Verify Certificates: For low-voltage equipment, check CCC certification (nationally mandatory); for high-voltage equipment, check type test reports. Certificates must correspond to the purchased model.
- Step 2: Check Test Reports: Coverage of test reports (GB/IEC standards) for temperature rise, short circuit, mechanical life, protection level, etc., reflects the technical level.
- Step 3: Verify Components: The core of a complete set of equipment is its components (circuit breakers, contactors, protection devices). Verify the brand and grade list of components.
- Step 4: Examine the Workmanship: Busbar processing, cable routing, terminal crimping, grounding processes. Video factory visits to see the assembly line are the most intuitive.
- Step 5: Check Performance: Supply and commissioning records for similar projects, failure rate reputation, are long-term proof of quality.
- Step 6: Acceptance Testing: After arrival, perform insulation testing, power-on testing, and functional commissioning (SAT). Accept the product item by item according to the technical agreement.
Key Points for Judging Different Product Categories
Transformers: Check type testing and operational performance (temperature rise, short-circuit withstand); Switchgear: Check component configuration and assembly process; Circuit breakers: Check breaking capacity test and mechanical life; Instrument transformers: Check accuracy verification certificate;
Cables: Check conductor material and factory test report (withstand voltage, insulation resistance).
Pitfalls to Avoid
First, “borrowed certificates.”
Using test reports from other models to impersonate this model; the certificates must correspond.
Second, “downgrading.”
Quoting branded components but delivering generic components; keep the list locked.
Third, “refurbished.”
Second-hand and refurbished parts mixed in; inspect the batch stamp and appearance.
Fourth, “perfunctory testing.”
Request factory test records and third-party test reports.
Trends and Reminders
The quality assessment of power equipment is moving towards “data-driven” methods: transparent factory test data, digital quality inspection reports, and third-party supervision are becoming trends, with leading manufacturers providing traceable quality data.
For purchasers, we recommend “six-step verification, evidence chain archiving, and third-party spot checks.”
Quality is not something you can see, it’s something you verify—only with a complete evidence chain can you be confident in the equipment.
