In the conventional transmission line frequency parameter testing, the use of three-phase autotransformer and large-capacity power isolation transformers to provide testing, CT and PT as electrical signals through power metering, and finally pointer precision electrical testing instrument ( ammeter, voltmeter and power meter) measurements of various electrical parameters, calculate the final transmission line frequency parameter test results. Complete set of test equipment bulky, heavy, with cranes and other required work, is not conducive to on-site work, and because the test frequency power supply is easy and frequency interference signal is mixed coupling, a great deal of measurement error, need greatly improved signal to noise ratio, capacity and volume requirements of the power supply further improved.
Currently sold in the market do not provide test power transmission line parameters tester, testing process still requires enormous frequency power supply equipment, still does not work under strong interference, even when serious burn instruments, such instruments only replaced traditional meter to achieve a test automation and computing, but can not solve the huge measure of immunity and three-phase power supply volume of the underlying problem.
With the development of the grid and land line corridor tense situation on the same tower erected back more and more common, the coupling between the transmission lines more closely, when the transmission line parameters tester interference is growing, serious security affect test accuracy and transmission line parameters tester equipment, solve this problem, Wuhan Guo Ding Technology Co., Ltd. has developed a new generation of transmission line parameters tester, integrated power-frequency test, measurement instruments, mathematical model in one eliminate the influence of strong interference, transmission line parameters to ensure the safety of the tester can be extremely easy to quickly and accurately measure the frequency of the transmission line parameters.

GDSD-2802 transmission line parameters tester main features are:
1, fast and accurate completion of the line positive sequence capacitance, the positive sequence impedance, zero sequence capacitance measurement parameters, zero sequence impedance, but also can measure the mutual inductance between the line and the coupling capacitance measurement (straight line resistance using a special instrument for direct resistance line measuring);
2, anti-interference ability, energy frequency signal and frequency signal interference ratio of 1:10 for the accurate measurement of conditions in different;
3, the external wiring is simple, only one access circuit under test to complete all of the deflectors line parameter measurement;
4, with IPC as the core instrument to achieve the test power, instrumentation, model integration, the device was concentrated to a truck with a single instrument. A TFT color LCD output, touch screen, micro-printer to print the results panel of Chinese characters, the operation is very simple;
5, the test process is quick, the instrument automatically complete the test mode control, Buck-Boost control and data measurements and calculations, and print measurement results, the measurement of a parameter sequence about a minute and a half to complete, test time is shortened, the workload greatly reduced within 30 minutes to complete the traditional method two hours of work;
6, high accuracy, the instrument itself provide access to the frequency-frequency power supply (47.5Hz and 52.5Hz), easily separated frequency noise and interference, effectively achieve high-precision measurement of small signals;
7, with a single connection to complete the entire measurement sequence parameters, completely solve the existence of existing test methods exist to test switching cumbersome wiring, interference, stability, accuracy and other issues.

GDSD-2802 transmission line parameters tester technical parameters:
1, the instrument Power supply: three-phase, ~ 380V ± 10%, 10A, 50Hz (RMS)
2, the internal power-frequency characteristics of the instrument:
Maximum output voltage
Three-phase: ~ 200V (RMS)
Maximum output current: 0A
Output frequency: 47.5Hz, 52.5Hz
3, measuring range:
Capacitance: 0.1 ~ 50μF;
Impedance: 0.1 ~ 400Ω;
Impedance angle: 0 ° ~ 360 °;
4, the measurement resolution:
Capacitance: 0.01μF;
Impedance: 0.01Ω;
Impedance angle: 0.01 °
5, measurement accuracy:
Capacitance: ≥1μF when, ± 1% of reading ± 0.01μF;
<When 1μF, ± 3% of reading ± 0.01μF;
Impedance: ≥1Ω when, ± 1% of reading ± 0.01Ω;
<When 1Ω, ± 3% of reading ± 0.01Ω;
Impedance angle: ± 0.2 °
6, anti-interference parameters
Interference voltage: Portrait inductive interference to the instrument test after the power voltage <350V;
Interference currents: the first and last ends of the line shorted to ground <40A; stable than the instrument output signal and the interference signal at 1:10 of the conditions to complete the test is accurate.
7, Dimensions: length 595 × width 500 × high 530 (mm3)
8, Weight: 75Kg
9, the instrument uses the environment
Ambient temperature: -15 ℃ - + 40 ℃
Relative humidity: <90%

GDSD-2802 transmission line parameters Tester Accessories:
1, a host instrument
2, a set of four current lines (yellow, green, red, black)
3, a set of four voltage signal line (yellow, green, red, black)
4, three-phase power line (yellow, green, red) set
5, two mutual inductance test leads (red, black)
6, spare paper vols
7, protective conductor (bare copper wire) a
8, a test line package
9, a keyboard + mouse
10, U disk (data import and export use) a
11, the touch pen two
12, a certificate
13 inspection report

GDSD-2802 transmission line parameters tester for measuring electrical power system transmission line parameter measurement, measurement of capacitance, impedance parameters