Product Introduction
The UHV-107 CT/PT Volt-Ampere Characteristic Tester is engineered for automated testing of Protection-Class and Metering-Class CTs/PTs.The instrument integrates multiple functions including VA characteristic testing, turns ratio testing, polarity testing, and error analysis into one unit, enabling fast and accurate on-site and laboratory testing of transformers. It is an important testing device for substations, power plants, power supply enterprises, and transformer manufacturers in the power system.
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.
Product Characteristics
1、All-in-One Operation – Performs all tests (excitation curves, ratio, polarity, demag, 5%/10% error curves, secondary burden, AC withstand) without external equipment
2、Automated Analysis – Auto-detects CT/PT excitation knee-point and generates 5%/10% error curves
3、Intuitive Interface – Smart controller with large LCD graphical display for simplified operation
4、On-Site Reporting – Integrated micro-thermal printer for instant results
5、Advanced Data Management
Stores 3,000 test sets (battery-backed retention)
USB export to generate Word reports on standard PCs
6、Field-Optimized Design – Lightweight (≤22kg) and compact for enhanced portability
Parâmetros do produto
The main parameters
| Item | parâmetro | |
| Fonte de alimentação funcionando | AC220V±10% 、50Hz | |
| Devices output | 0~2500V (peak value of 20A) Note: 0 to 5A is the true value, and greater than 5A to 20A is the calculated value | |
| Saída de alta corrente | 0～600A | |
| Precisão de medição de excitação | ≤1.0% (0.5%* reading +0.5%* range) | |
| Relação de TC medição | The scope of | ≤3000A/1A(15000A/5A) |
| precisão | ≤0.5% | |
| PT ratio medição | The scope of | ≤500kV |
| precisão | ≤0.5% | |
| work environment | temperatura | -10℃~40℃ |
| umidade | ≤90% | |
| altitude | ≤1000m | |
| tamanho | 410 mm × 260 mm × 340 mm | |
| peso | ≤25kg | |
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.
