Product Introduction
The CT/PT Volt-Ampere Characteristic Tester is a portable field instrument that automates comprehensive testing of protection-class (P-class) and metering-class CTs/PTs. It performs key assessments including excitation curve measurement with automatic knee-point detection, 5%/10% error curve generation, ratio verification, polarity checks, and secondary burden testing – all without external equipment. Compliant with GB 20840.3-2013/IEC standards, the integrated solution features a large graphical LCD and intuitive controls for simplified operation, with a built-in thermal printer for on-site reporting and USB data export for generating Word reports. Weighing ≤22kg with 3,000+ battery-backed test storage, it delivers laboratory-grade accuracy in field conditions.
Product functions
ECharacteristic Testing Function
Performs VA characteristic tests on current transformers (CT) and voltage transformers (PT), automatically measuring the relationship between excitation voltage and excitation current, generating VA characteristic curves, and evaluating core performance, saturation characteristics, and operating condition of the transformer.
Turns Ratio Testing Function
Automatically detects the current and voltage conversion ratio between the primary and secondary sides of the transformer, calculates the actual ratio and error, and determines whether the transformer ratio meets design requirements, ensuring accuracy of metering and protection systems.
Polarity Testing Function
Detects the polarity of the primary and secondary windings of the transformer, quickly determining the relationship between terminals of the same polarity, preventing protection misoperation or abnormal measurement data caused by reversed polarity connections, thereby improving equipment operational reliability.
Error Analysis Function
Automatically calculates parameters such as ratio error and phase error based on test data, analyzes and determines the accuracy class of the transformer, and helps users quickly evaluate whether the equipment meets operational standards.
Key Advantages of CT/PT Volt-Ampere Characteristic Tester
1、Standards-Driven Compliance
Certified for GB 20840.3-2013 + IEC 60044 (global regulatory acceptance)
2、Unmatched Field Efficiency
≤22 kg all-in-one design – Replaces multiple devices; zero external equipment required
Instant micro-thermal printing – On-site report generation in 8 seconds
3、Engineered Precision
AI-assisted analysis – Auto-calculates knee-point with ≤0.5% repeatability
Dynamic error mapping – Generates 5%/10% composite accuracy curves
4、Industrial-Grade Resilience
3,200 test records – Military-grade flash storage with supercapacitor backup
-25°C to 55°C operational range – Verified in Qinghai-Tibet Plateau field trials
5、Seamless Data Integration
Smart USB 3.0 export – One-click generation of IEC 61850-compliant Word/PDF reports
6、Zero-Curve Learning Operation
Intuitive graphical UI with guided workflow – <15 minutes CT commissioning
Technical Parameter
| Item | parâmetro | |
| Fonte de alimentação funcionando | AC220V±10% 、50Hz | |
| Device output | 0~2500V 5kVA Maximum setting value 20A | |
| Saída de alta corrente | 0～600A | |
| Excitation precision | ≤0.5%（0.2%* reading +0.3%* range) | |
| Secundário winding resistance medição | scope of | 0.1～300Ω |
| precisão | ≤1.0% (0.4%* reading +0.6%* range) | |
| Secondary actual load medição | scope of | 5～500VA |
| precisão | ≤0.5%（0.2%* reading +0.3%* range) ± 0.1va | |
| Medição de fase (Angle difference) | precisão | ±4min |
| resolution of the | 0,1 minutos | |
| contrast | precisão | 0.05% |
| Relação de TC medição | scope of | ≤25000A/5A（5000A/1A） |
| precisão | ≤0.5% (0.2%* reading +0.3%* range) | |
| PT ratio medição | scope of | ≤500kV |
| precisão | ≤0.5% (0.2%* reading +0.3%* range) | |
| work environment | temperatura | －10℃ ～ 40℃ |
| umidade | ≤90% | |
| altitude | ≤1000m | |
| tamanho | 410 mm × 260 mm × 340 mm | |
| peso | ≤22kg | |
Application Scenarios
VA Characteristic Testing Function
Performs VA characteristic tests on current transformers (CT) and voltage transformers (PT), automatically measuring the relationship between excitation voltage and excitation current, generating VA characteristic curves, and evaluating core performance, saturation characteristics, and operating condition of the transformer.
Turns Ratio Testing Function
Automatically detects the current and voltage conversion ratio between the primary and secondary sides of the transformer, calculates the actual ratio and error, and determines whether the transformer ratio meets design requirements, ensuring accuracy of metering and protection systems.
Polarity Testing Function
Detects the polarity of the primary and secondary windings of the transformer, quickly determining the relationship between terminals of the same polarity, preventing protection misoperation or abnormal measurement data caused by reversed polarity connections, thereby improving equipment operational reliability.
Error Analysis Function
Automatically calculates parameters such as ratio error and phase error based on test data, analyzes and determines the accuracy class of the transformer, and helps users quickly evaluate whether the equipment meets operational standards.
Winding Resistance Testing Function
Measures the DC resistance of the transformer secondary winding, checks the winding connection condition, promptly identifies potential issues such as poor contact or winding abnormalities, and provides a reference basis for equipment maintenance.
FAQ about CT PT Volt-ampere Tester
What is a transformer VA ratio polarity comprehensive tester?
A transformer VA ratio polarity comprehensive tester is an intelligent testing device used for measuring the performance parameters of current transformers (CT) and voltage transformers (PT). The instrument integrates multiple functions including VA characteristic testing, turns ratio testing, polarity testing, error analysis, and winding resistance testing into one unit, enabling rapid performance testing and condition assessment of transformers.
Why is VA characteristic testing of transformers necessary?
VA characteristic testing reflects the excitation performance and saturation characteristics of the transformer core, and is an important basis for determining whether the transformer meets protection and metering requirements. By analyzing parameters such as the excitation curve, knee-point voltage, and excitation current, issues such as core aging, winding abnormalities, or degradation of magnetic performance can be promptly identified, ensuring the safe and stable operation of the power system.
What roles do turns ratio and polarity testing play in transformer inspection?
Turns ratio testing is used to verify whether the actual transformation ratio of the transformer complies with the rated value, ensuring the accuracy of measurement and protection systems. Polarity testing is used to confirm the polarity relationship between the primary and secondary windings, preventing relay protection misoperation, metering errors, or system abnormalities caused by wiring mistakes. These two tests are important contents in pre-commissioning and periodic inspection of transformers.
