Protective relay
Numerical protection relays with IEC 61850 capability for feeder, transformer, and motor protection. Firmware version and the actual test protocol are checked before commissioning.
InquireProtection & Power Quality
The Protection & Power Quality we reverse-engineer, verify, and negotiate on your behalf. Pick a model or send us the spec.
Surge arrester
ZnO gapless arresters for station and distribution duty, 3-220 kV. Rated voltage, discharge-current class, and residual-voltage curve are verified against the test report.
InquirePower capacitor / PFC
LV capacitor banks, detuned reactors and automatic PFC panels for power-factor correction and harmonic mitigation. Capacitance tolerance, detuning factor and switching duty are verified against factory data.
InquireCapacitor bank
LV and MV capacitor banks for power-factor correction, fixed or automatic. Capacitance tolerance, rated voltage, and switching duty are checked against factory data.
InquireVerifying protection and power-quality equipment
Protection and power-quality devices — protective relays, surge arresters, capacitor banks and harmonic filters — raise the hard substitution question around **software-defined parameters**: trip curves, framing templates, and communication protocols pinned to an existing SCADA topology. Hardware equivalence is only the first step; the real exposure sits in firmware version availability and access to the setting toolchain.
Verification checklist: firmware and revision parity with the replaced devices; reproducible terminal mapping for the existing wiring; local availability of the special test sets needed for periodic maintenance; and type-test reports whose named coverages reach your operating conditions.
For a switch of this kind SpecSourcing does not answer "compatible" in the abstract: the free 48-hour screen returns a go / hold / walk verdict tied to your project use, and the paid tiers map settings and interface parameters back onto the installed base.
Protection: the hardware is easy, the software is not
Chinese assembly clusters can supply the hardware completely. But a protection substitution is never decided by hardware — it is decided by firmware, curve libraries and test tooling.
01
Hardware availability is not the constraint
Relays, surge arresters, capacitor banks and harmonic filters all sit inside the same clusters, where a local supply rate near 85% means terminals, wiring accessories and mounting hardware follow a model change quickly.
02
The local toolchain is closing, unevenly
Setting software, manual language versions and locally available periodic-test equipment are what turn into a cost sink in the first annual verification cycle after commissioning. Chinese manufacturers have invested heavily here in recent years, but capability still varies sharply between them.
03
The checklist that decides it
Firmware and revision parity with the replaced device; terminal mapping that can be reproduced after the swap; type-test coverages that actually reach your operating conditions; and calibration traceability in the factory records — not a generic statement of conformity.
04
What the free screen settles first
Whether the existing SCADA interface, the curve library and the spares position make the switch worth doing at all — one verdict on the supplier and one core reason within 48 hours, before anyone spends engineering hours.
Before you retype the settings, check the toolchain
Send the model of the device you are replacing and what it talks to. We come back with a verdict on the supplier, one core reason, and the firmware, curve-library and calibration-traceability questions that decide whether the swap is repeatable.
Brand equivalents in this category
Equipment sourcing FAQ
How do you tell a real factory from a trading office?
We cross-check the business-licence scope, social-insurance headcount, and customs filing. A "manufacturer" with two insured staff and no production-equipment records is almost always a trader reselling someone else's unit. We also look at whether the address is an industrial park or a serviced office.
Can you match a specific brand or model to the right manufacturer?
Yes. Send us the brand and model, or just a nameplate photo, and we reverse-engineer the key parameters: rated voltage, impedance, cooling class, protection grade. Then we shortlist Chinese manufacturers whose product line genuinely covers those parameters. This is the Spec Match tier.
Can you negotiate on my behalf?
Yes. The Procurement Execution and Remote Audit tiers include independent negotiation support, and On-Site Verification covers the physical checks; either way, we sit on your side of the table, not the factory's.
Do you take commissions from factories?
Never. We're paid only by you, on a flat fee. When we name an alternative supplier, we state in writing that we have no financial relationship with it. No referral fees, no kickbacks, no revenue share. Our only incentive is that your deal closes.