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Chế độ quét
1. Quét tuyến tính
Dải đo quét: (10Hz)-(10MHz) 40000 điểm quét; độ phân giải 0.25kHz, 0.5kHz và 1kHz.
2. Phép đo quét phân đoạn
Dải đo quét: (0.5kHz)-(1MHz) 2000 điểm quét;
(0.5kHz)-(10kHz)
(10kHz)-(100kHz)
(100kHz)-(500kHz)
(500kHz)-(1000kHz)
Dải đo biên độ: (-120dB) -(+20dB)
Độ chính xác đo biên độ: 0.1dB
Độ chính xác của tần số quét: 0.00005
Trở kháng đầu vào tín hiệu: 1MΩ
Trở kháng đầu ra tín hiệu: 50Ω
Biên độ tín hiệu ra: ±20V
Tốc độ lặp lại phép đo cùng pha: 0.999
Kích thước máy đo: (Dài, rộng và cao): 370x300x170(mm)
Kích thước hộp cáp hợp kim nhôm: (Dài, rộng, cao): 420x300x300(mm)
Tổng trọng lượng: 20Kg
Nhiệt độ hoạt động: -10℃- +40℃
Nhiệt độ bảo quản: -20℃ - +70℃;
Độ ẩm tương đối: <90%, không ngưng tụ
General Information:
The EPFR80 SFRA transformer sweep frequency response analyzer, also called transformer winding deformation analyzer, adopting the sweep frequency response analysis (SFRA) method that is being developed and perfected by developed countries in the world, the transformer winding deformation analyzer can accurately judge the internal faults of transformer based on the measurement of the characteristic parameters of transformer windings.
The coils and internal structure are determined after the transformer is designed and manufactured. If the coils of a multi-winding transformer have the same voltage level, but different winding methods, the corresponding parameters (Ci, Li) of each coil should be certain. Therefore, the frequency domain characteristic response of each coil will also be determined depending on the corresponding parameters, and the frequency spectrum between the corresponding three-phase coils is comparable.
The distribution parameters of the transformer winding will change if turn-to-turn short circuit and short circuit between phases occur during the test, or the relative displacement of coils is caused by the collision in the transport process, and the coils lose their shape due to electromagnetic tension in the states of short circuit and fault during operation. Further, the original frequency domain characteristics of the transformer will be affected and changed, that is, the frequency response will vary considerably and the resonance frequency point will shift. The transformer winding analyzer developed based on the response analysis method is such a novel non-destructive testing equipment for internal faults of transformer. It applies to the testing of internal structure faults of 63kV-500kV power transformers.
The EPFR80 SFRA analyzer will quantify the response changes of internal winding parameters in different frequency domains, and then determine the degree of change of internal windings according to the variables, the amplitude of frequency response change, the area and the trend of frequency response change. Thus, it can judge whether the transformer has been severely damaged and needs to be overhauled according to the measurement results.
The analyzer can judge the degree of fault of the transformer under operating conditions by comparing the difference in the characteristic spectrum between the faulty transformer coils whether the frequency domain characteristic spectrum was saved or not in the past. Of course, it will be easier to provide an accurate and powerful basis for the operation status, post-accident analysis and maintenance and repair of the transformer if there is a set of original winding characteristic spectrum.
The SFRA transformer sweep frequency response analyser, also called winding deformation analyzer is equipped with a high-precision measurement system composed of a laptop and a single-chip microcomputer. It is simple to operate with a compact structure and a perfect test analysis function. The operators who have read the instruction manual or have accepted short-term training can operate and use the analyzer themselves.
