HF-IT-201 Instrument Transformer Calibrator

Instrument Transformer Tester

Instrument transformer testers for current transformer and voltage transformer ratio, polarity, burden, excitation and accuracy testing.

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Instrument Transformer Test Equipment: Calibrators, Analyzers and Burden Sets

Ten instruments covering the three jobs that come up when current and voltage transformers are commissioned or maintained: proving the ratio and error, measuring the burden the secondary circuit actually presents, and supplying the test voltage or current. The table groups them by job rather than by model number.

Quick comparison

JobInstrumentsWhat it gives you
Calibration and errorHF-IT-201, HF-IT-203Ratio and phase error measurement against a reference, the basis of any calibration certificate.
Analysis and characteristic curvesHF-IT-210, HF-IT-202, HF-IT-205, HF-IT-2045 % and 10 % error curves, excitation and ratio checks. HF-IT-210 is designed to IEC 60044-1, -2 and -6, GB 1208, 1207 and 16847, and IEEE C57.13; maximum test knee-point voltage for a CT reaches 45 kV.
Burden and test supplyHF-IT-206, HF-IT-207, HF-IT-208, HF-IT-209The load the secondary actually sees. HF-IT-208 is built to JJG 313-94 and JJG 314-94 with 2.5–60 VA at cos φ =0.8; HF-IT-207 runs 24 hours continuously and stores 480 data groups.

Before you specify one

  • Separate the acceptance test from the diagnostic. A calibrator proves accuracy against a reference and produces the number that goes into a report. An analyzer produces curves and diagnoses whether the transformer will saturate in service. Buying one and expecting the other is the most common mismatch.
  • Check the knee-point voltage range against your CT class. HF-IT-210 reaches 45 kV maximum test knee-point voltage. If the station CTs run higher, that specification decides the instrument before price does.
  • Do not treat the burden as an accessory. A CT that passes every ratio test and still misreads is usually driving an over-large burden. HF-IT-207 and HF-IT-208 exist for that measurement, and they are the cheapest part of the set.
  • Confirm the standards the instrument was designed to. HF-IT-210 is built to IEC 60044-1, IEC 60044-2, IEC 60044-6, GB 1208, GB 1207, GB 16847 and IEEE C57.13. That list tells you which test procedures it will support; ask for the same list on any alternative.

Common questions

Can one instrument do both CT and PT testing?
HF-IT-210 is a combined CT/PT analyzer. The dedicated units (HF-IT-203 for CT calibration, HF-IT-204 for VT testing) exist where one transformer type dominates the workload and a single-purpose instrument is easier to certify.

Do I need a burden box and a burden tester?
They answer different questions. The box presents a known burden; the tester measures the burden the installed circuit actually has. Commissioning usually needs the measurement, and the box is used when a specific burden must be simulated.

How long does delivery take?
Standard models ship in 7–15 working days; configured or custom variants take 25–35 days.

Datasheets for each model are on the product pages and in the datasheets library. Where a model is described as designed to a standard, that describes the design basis of the instrument, not a certification of the test object.

All 10 models in Instrument Transformer Tester
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