In the power system, the accuracy and reliability of the current transformer (CT) directly affect the accuracy of relay protection, energy measurement, and system monitoring.It is important to choose a suitable current transformer analyzer, but there are many types on the market with different functions. This article will provide the selection guide from parameters, test functions, technical standards, brand comparison and future trends to help engineers make informed decisions.
1. Based on the test requirement and usage scenario.
Before selection, it is necessary to clarify the test object and purpose, and the requirements for equipment in different scenarios are significantly different.
A, If it will be used for Laboratory high precision calibration;
Suitable for metering CT (such as 0.2S), to meet the JJG 313-2023 standard, accuracy requirements ≤0.05%.
Recommended functions: automatic calculation of ratio/Angle difference, harmonic analysis (such as 50 harmonics).
B, On-site operation and maintenance inspection
Focus on rapid diagnosis of CT variable ratio, polarity, and voltammetry characteristics (such as 10% error curve).
Key requirements: portability (< 10kg). Like model: HYCT-100
2. Based on the key performance parameter.
|
parameter |
Requirement |
Ref standard |
|
Current range |
At least 1mA~600A(primary current CTneed to be 5kA ) |
IEC 61869-1:2024 |
|
Level of accuracy |
Lab level≤0.05%,on-site level≤0.1%(Ratio difference/Angle difference) |
JJG 313-2023 |
|
Output power |
≥200VA(Avoid insufficient output when testing high-impedance CT) |
IEEE C57.13-2023 |
|
Volt-ampere characteristic test |
Support automatic curve drawing, and calculate 10% error point (protection level CT mandatory) |
GB/T 20840.2-2025 |
|
Data storage |
≥1000 group test results, support CSV/PDF |
- |
|
level of protection |
IP65 (dustproof and waterproof for outdoor use) or explosion-proof certification (chemical/mine scenarios) |
IEC 60529 |