The instrument meets the requirements of the "Regulations for the start and acceptance of 110 kV and above power transmission and transformation capital construction Projects", DL/T559-94 "Regulations for the operation and adjustment of 220-500kV Network Relay Protection Devices" and "GB50150-2016".

The instrument adopts integrated structure, built-in variable frequency power module, variable frequency voltage adjustable output power supply. The digital filter technology is adopted to avoid the interference of power frequency electric field and solve the difficult problem of accurate measurement under the interference of strong electric field.

Instrument characteristics
1, quickly and accurately complete the line's positive sequence capacitance, zero sequence capacitance, positive sequence impedance, zero sequence impedance and other parameters measurement, but also can measure the mutual inductance reactance between the lines, coupling capacitance, interphase capacitance measurement;
2, strong anti-interference ability, can be accurately measured under the condition of 1:10 ratio of different frequency signal and power frequency signal;
3, the external connection is simple, only one access to the lead line of the line under test can complete the measurement of all line parameters; Thoroughly solve the problems of cumbersome test wiring switching, interference, stability, accuracy and other aspects existing in the existing test means.
4, the instrument with high-speed single-chip microcomputer as the core, to achieve the integration of test power supply, instrument, calculation model, a truck of equipment concentrated into one instrument.
5, the instrument uses 8-inch color touch screen display, embedded Chinese micro printer printing results;
6, the instrument test process is fast, the instrument automatically completes the test, the test time is shortened, and the traditional method of 1 day's work can be completed within 20 minutes;
7, high measurement accuracy, easy separation of power frequency and clutter interference, effectively achieve high-precision measurement of small signals;

Technical index
Accurately measure the positive sequence capacitance, zero sequence capacitance, positive sequence impedance, zero sequence impedance, mutual inductance and coupling capacitance, and interphase capacitance of various high-voltage transmission lines
 
The measurement results in this instrument are described:
Positive sequence impedance: has been converted to a positive sequence parameter per kilometer per phase.
Zero sequence impedance: has been converted to zero sequence parameter per kilometer per phase.
Positive sequence capacitance: has been converted into a positive sequence parameter per kilometer of line to ground per phase.
Zero sequence capacitance: has been converted to the average zero sequence parameter to earth per kilometer per phase.
Coupling capacitance: Actual measured value, no conversion
Mutual inductance impedance: Actual measured value, no conversion
Interphase capacitance: Actual measured value, no conversion.
Line to ground capacitance: Actual measured value, no conversion.
Line to ground impedance: Actual measured value, no conversion.
 
Input power supply: three-phase AC380V±10%, 50Hz
Maximum output voltage: AC 200V Accuracy: 1%
Maximum output current: 5A
Output signal frequency: 47.5Hz/52.5Hz; 50Hz/50Hz
 
Measuring range:
Positive sequence capacitance, zero sequence capacitance, coupling capacitance: 0.1 ~ 50μF; Measurement resolution: 0.01μF; Measurement accuracy: 0.1μF ~ 1μF ±3%±0.05μF; 1μF ~ 50μF ±1.5%±0.03μF
Positive sequence impedance, zero sequence impedance, mutual inductance reactance: 0.1 ~ 400Ω; Measurement resolution: 0.01Ω; Measurement accuracy: 0.1Ω ~ 1Ω ±3%±0.05Ω; 1Ω ~ 400Ω ±3%±0.03Ω
Impedance Angle: 0 ~ 360°; Measurement resolution: 0.01°; Measurement accuracy: ±0.2° (voltage >1.0V); ±0.3° (voltage >0.2 ~ 1.0V)
 
Dimensions: 620mm × 500mm ×600mm (including wheels); Weight: 79kg
 
Anti-interference parameters:
Interference voltage: longitudinal induced voltage < 350V after connecting the instrument to test the power supply;
Interference current: < 40A when the first and last ends of the line are short-grounded;
It can complete the test stably and accurately under the condition that the ratio of output signal and interference signal is 1:10.
Operating environment: Ambient temperature: -15 ℃ ~ +40℃; Relative humidity: < 90%