Frequency Conversion CT PT Analyzer Transformer Tester | 60kV
Inflection Point| XHTX206
The XHTX206 Frequency Conversion CT PT Analyzer is a new-generation
comprehensive transformer characteristic tester developed for the
power industry, replacing the traditional combination of
variable-ratio transformers, step-up transformers and current
boosters. Based on advanced frequency conversion testing technology
with a high-performance DSP and FPGA platform, it fully satisfies
excitation (volt-ampere) characteristic, transformation ratio,
polarity, secondary winding resistance, secondary burden, ratio
error and angle error testing of protection-class, metering-class
and TP-class current transformers, as well as excitation
characteristic, ratio, polarity and secondary winding resistance
testing of PT electromagnetic units. The instrument delivers higher
automation, better stability and significantly improved testing
efficiency for professional transformer verification.
Applications & Target Audience: Designed for grid company maintenance branches and transmission &
distribution engineering contractors (EPC), electrical
commissioning teams of wind and solar power plants, electrical test
laboratories of large industrial enterprises such as steel, cement
and chemical plants, electrical testing service companies and
equipment rental providers, and power vocational training colleges
for hands-on teaching of transformer characteristic testing.
Key Specifications
| Parameter | Specification |
|---|
| Test Objects | CT (protection / metering / TP class), PT electromagnetic units |
| Output | 0~180Vrms, 12Arms, 36A (peak) |
| Voltage Accuracy | ±0.2% |
| CT Ratio Range | 1~40000 (1~2000 <0.1%; 2000~5000 <0.2%; 5000~35000 <0.5%) |
| PT Ratio Range | 1~35000 |
| Phase Measurement | Accuracy ±5min, resolution 0.5min |
| Secondary Winding Resistance | 0~600Ω, <0.5% ±2mΩ |
| AC Burden Measurement | 0~1000VA, <0.5% ±0.02VA |
| Power Supply | AC220V ±10%, 50Hz |
| Working Environment | -10~50°C, humidity ≤90% |
| Dimensions / Weight | 365×290×153mm / <10kg |
Key Features
Frequency conversion method tests CT/PT excitation characteristic
curves and 10% error curves, handling inflection points up to 60kV
with only 180Vrms output and 12Arms (36A peak) current.
On-site verification of current transformers without standard CT,
booster, load box, voltage regulator or heavy current cables,
greatly reducing workload and improving efficiency.
Ratio error within ±0.1% and angle error within ±5min, enabling
field testing of 0.2S class current transformers with a ratio range
of 1~40000.
Automatically calculates inflection point voltage/current, 10% (5%)
error curves, accuracy limit factor (ALF), instrument security
factor (FS), secondary time constant (Ts), remanence coefficient
(Kr), saturated and unsaturated inductance.
One-key testing of CT DC resistance, excitation, ratio and polarity
with a single wiring scheme for all CT tests except burden, meeting
GB1208 (IEC60044-1), GB16847 (IEC60044-6) and GB1207 standards.
Optional dedicated current booster outputs 180A for on-site
through-flow testing.
Suitable CT grades include P, TPY, metering, PR, PX, TPS, TPX and
TPZ, with automatic standard selection based on transformer type
and class.
Advanced Features
Dynamic Chinese graphical interface with automatic wiring diagrams
for each selected test item, guiding operators step by step.
5.7 inch graphic transflective LCD, clearly readable in direct
sunlight for outdoor field work.
Rotary photoelectric mouse for fast, intuitive parameter entry and
operation.
Built-in printer for automatic test report printing; stores up to
1000 groups of data with power-off retention.
Portable construction weighing under 9kg for easy field
transportation.
Four-terminal measurement method ensures accurate secondary winding
resistance testing by eliminating lead resistance errors.
Test Items for Current Transformers
| Test Item | Description |
|---|
| Secondary Winding Resistance | Measures CT secondary winding DC resistance with four-terminal
method, range 0~600Ω |
| Excitation Characteristics | Tests volt-ampere characteristic curve of CT and PT electromagnetic
units |
| Transformation Ratio & Polarity | Checks CT/PT ratio accuracy and winding polarity with one-key
operation |
| Secondary Burden | Measures AC burden up to 1000VA with <0.5% ±0.02VA accuracy |
| Ratio Error & Angle Error | Calculates ratio error within ±0.1% and angle error within ±5min |
| Through-flow Test | With optional booster, outputs up to 180A for on-site through-flow
testing |
Standards Compliance & Test Principles
The XHTX206 follows the low-frequency method test principle for
excitation characteristic testing, which significantly reduces the
required test voltage and current while preserving measurement
accuracy. The instrument also applies the 10% error curve
calculation method to evaluate the performance of protection-class
current transformers, helping engineers verify that protection
devices will operate correctly under fault conditions. All tests
comply with GB1208 (IEC60044-1), GB16847 (IEC60044-6) and GB1207
standards, and the instrument automatically selects the appropriate
standard according to the transformer type and class, ensuring
consistent, repeatable results that are accepted by utilities and
third-party laboratories worldwide.
For various CT structures including bushing-type, wound-type and
window-type current transformers, the appendix of the manual
provides detailed four-terminal wiring diagrams, guaranteeing
correct connections for accurate measurement in every
configuration. The instrument's self-test function verifies
internal circuits and measurement channels before testing, while
the through-flow test function validates the complete current loop,
making the XHTX206 a complete verification solution for transformer
testing professionals.
FAQ
Q1: Who is the XHTX206 CT PT analyzer designed for?
It is designed for grid company maintenance branches and
transmission & distribution engineering contractors (EPC), wind and
solar power plant electrical commissioning teams, electrical test
laboratories of steel, cement and chemical enterprises, electrical
testing service companies and equipment rental providers, and power
vocational training colleges.
Q2: What tests can it perform?
It performs excitation (volt-ampere) characteristics,
transformation ratio, polarity, secondary winding resistance,
secondary burden, ratio error and angle error tests for protection,
metering and TP class CTs, plus excitation characteristics, ratio,
polarity and secondary winding resistance tests for PT
electromagnetic units.
Q3: Why is frequency conversion technology important?
Frequency conversion testing generates the full excitation
characteristic curve and 10% error curve using only 180Vrms output
and 12Arms current, yet handles CTs with inflection points up to
60kV, eliminating the need for bulky high-voltage boosters and
large current sources.
Q4: Can it verify CTs on site without a standard transformer?
Yes. It verifies current transformers on site without standard CT,
booster, load box, voltage regulator or heavy current cables,
achieving ratio error within ±0.1% and angle error within ±5min,
sufficient for 0.2S class CT field testing.
Q5: What accessories, packaging and delivery terms apply?
An optional dedicated current booster is available for 180A
through-flow testing. The instrument is delivered in wooden
packaging within 5-8 working days, with T/T payment and 1 set MOQ.
