I. Introduction:
Our company has designed the frequency response analysis equipment
SFRA-II, which can use two methods to detect the deformation of the
transformer at the same time. One is the sweep frequency response
analysis method, the other is low-voltage short-circuit impedance
method. Using two methods can effectively reduce incorrect
judgments.
SFRA-II Sweep Frequency Response Analysis Equipment follows
the national power industry standards DL / T911-2004 and DLT
1093-2008, and can be used for IEC60076-18-2012 and
IEC60076-5-2006.
II.Main Features
1. This SFRA equipment uses the advanced technical of DDS;
2. The automatic sweep frequencty response analyzer uses the
high speed and advanced microprocessor to design;
3. It adopts AD chip of 16 bits;
4. With seven inch LCD touch screen of which the brightness can be
adjusted;
5. With thermal printer of which the print thick can be adjusted;
6. It could store one hundred and twenty groups of FRA data, fifty
groups of SCI data and thirty groups of SCI data, which could be
read to current screen or upload to the PC;
7. With PC software using which we could upload data ,test, analyze
data, print data, or create word document;
8. Using USB2.0 to connect to the device;
9. Dimension:49X31X25cm；
10. Weight:8.0KG;
11. Power supply:AC220V±10%, (50 or 60)HZ ;
12. Environment:-10℃～50℃; humidity <90％;
III. Technical Specifications:
Sweep frequency response analysis
| Two different sweep modes: Linear sweep, Section sweep |
| Linear sweep | 10HZ-1MHZ interval 0.5KHZ 2000 dots 100HZ-2MHZ interval 0.5KHZ 2000 dots 10HZ-1MHZ interval 0.25KHZ 4000 dots(PC available) 100KHZ-2MHZ interval 0.25KHZ 4000 dots(PC available) Frequency,interval,and scan dots can be set(PC available) |
| Section sweep | 10HZ-100HZ interval 1HZ 90 dots 100HZ-1KHZ interval 5HZ 180 dots 1KHZ -10KHZ interval 50HZ 180 dots 10KHZ-100KHZ interval 0.2KHZ 450 dots 100KHZ –300KHZ interval 0.5KHZ 400 dots 300KHZ – 1000KHZ interval 1KHZ 700 dots |
| Test range | (-100dB) - (+20dB) |
| Test accuracy | (-80dB) - (+20dB)0.2dB (-100dB) - (-80dB)1.0dB |
| Frequency accuracy | < 0.01% |
| Signal input impedance | > 1M Ω |
| Signal output impedance | 50 Ω |
| In-phase test repetition rate | 99.5% |
Short-circuit impedance and generator rotor AC impedance:
| AC impedance | 0～999.999Ω 0.2%±2 digits |
| AC voltage | 0～600V 0.2%±2 digits |
| AC ampere | 0～120A 0.2%±2 digits |
| Active power | cosφ>0.1 0.5%±2 digits cosφ<0.1 1.0%±2 digits Reactive power 0.2%±2 digits |
| Frequency | 45～65HZ 0.1% |
