In accordance with the requirements of the "pre-regulation", the following items shall be tested on the SF6 gas-insulated transformer:
1) Humidity test of SF6 gas (volume fraction at 20 °C);
2) SF6 gas analysis;
3) SF6 gas leakage test;
4) Winding DC resistance measurement;
5) testing of the insulation resistance, absorption ratio or polarization index of the winding together with the bushing;
6) measurement of the tan δ of the winding together with the casing;
7) Measurement of insulation resistance of iron core and clamp;
8) AC withstand voltage test.
The above tests are described as follows:
(1) Test 4) For the part related to the oil-immersed transformer, the transformer, cable, GIS side winding of the closed cable outlet or GIS outlet may not be tested periodically;
(2) Test 5), 6) For the relevant part of the oil-immersed transformer, the transformer, cable and GIS side windings of the closed cable outlet or GIS outlet can be measured at the neutral point;
(3) Test 7) ​​the same oil-immersed transformer;
(4) Test 8) Same as oil-immersed transformer, 110kV transformer adopts induction withstand voltage.
1) Humidity test of SF6 gas (volume fraction at 20 °C);
2) SF6 gas analysis;
3) SF6 gas leakage test;
4) Winding DC resistance measurement;
5) testing of the insulation resistance, absorption ratio or polarization index of the winding together with the bushing;
6) measurement of the tan δ of the winding together with the casing;
7) Measurement of insulation resistance of iron core and clamp;
8) AC withstand voltage test.
The above tests are described as follows:
(1) Test 4) For the part related to the oil-immersed transformer, the transformer, cable, GIS side winding of the closed cable outlet or GIS outlet may not be tested periodically;
(2) Test 5), 6) For the relevant part of the oil-immersed transformer, the transformer, cable and GIS side windings of the closed cable outlet or GIS outlet can be measured at the neutral point;
(3) Test 7) ​​the same oil-immersed transformer;
(4) Test 8) Same as oil-immersed transformer, 110kV transformer adopts induction withstand voltage.
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USB3.0 is a USB specification, which was initiated by Intel and other companies. The maximum transmission bandwidth of USB3.0 is as high as 5.0gbps (500MB / s).
While maintaining compatibility with USB2.0, USB3.0 also provides enhancements: significantly increased bandwidth (up to 5Gbps full duplex); better power management;
more power; faster device identification; and higher data processing efficiency.
The reason why USB 3.0 has the performance of "speeding" is entirely due to the improvement of technology.
Compared with USB 2.0 interface, USB 3.0 adds more physical buses in parallel mode.
You can pick up a USB Cable and look at the interface.
On the basis of the original 4-wire structure (power supply, ground wire, 2 pieces of data), USB 3.0 adds 4 lines for receiving and transmitting signals.
So there are eight lines in the cable and on the interface.
It is the additional 4 (2 pairs) of lines that provide the bandwidth required for "superspeed USB" to achieve "over speed".
Obviously, two (1 pair) lines on USB 2.0 are not enough.
In addition, in the signal transmission method, the host control mode is still used, but the asynchronous transmission is changed.
USB 3.0 makes use of two-way data transmission mode instead of half duplex mode in USB 2.0 era. In short, data only needs to flow in one direction, which simplifies the time consumption caused by waiting.
In fact, USB 3.0 does not take any rarely heard of advanced technology, but theoretically increases the bandwidth by 10 times. As a result, it is more friendly and friendly. Once superspeed USB products come out, more people can easily accept and make better customized products.
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