MCYXC-A Inter-frequency Line Parameter Tester

Model: MCYXC-A Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

Category: Cable Fault Tester

Keywords: MCYXC-A Inter-frequency Line Parameter Tester

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Product Overview

Before a newly constructed high-voltage transmission line is put into operation, in addition to inspecting the line’s insulation condition and verifying phase sequence, various power-frequency parameters must also be measured to serve as the practical basis for calculating system short-circuit currents, setting relay protection settings, estimating power-flow distribution, and selecting appropriate operating modes. The parameters that should generally be measured include DC resistance R and positive-sequence impedance Z. 1 , Zero-sequence impedance Z 0 , Positive-sequence capacitance C 1 and zero-sequence capacitance C 0 , Interphase capacitance C 12 。

For multiple circuits erected on the same pole or for lines that are closely spaced with long parallel sections, it is also necessary to measure the coupling capacitance C. m and mutual inductance impedance Z m 。

Prior to measuring the parameters, it is necessary to record the relevant design information for the transmission line, such as the line name, voltage level, line length, tower type, conductor model, and conductor cross-sectional area, and to develop a test plan based on this information and the site conditions.

In conventional power-frequency parameter testing of transmission lines, a three-phase autotransformer and a high-capacity isolation transformer are used to supply the test power; current and voltage transformers for power metering perform signal conditioning; and precision analog voltmeters, ammeters, and wattmeters are employed to measure the electrical parameters, from which the final test results for the transmission-line power-frequency parameters are calculated. This approach results in bulky and heavy test equipment that requires crane assistance, which is highly inconvenient for on-site measurements. Moreover, since the test power source is a power-frequency supply, it is prone to mixing with coupled power-frequency interference signals, leading to substantial measurement errors. Consequently, the signal-to-noise ratio must be significantly improved, further increasing the power-supply capacity and physical size of the equipment.

This instrument can accurately measure the power-frequency parameters of various high-voltage transmission lines—including overhead lines, cable lines, hybrid overhead-cable lines, and multi-circuit lines on the same tower—such as positive-sequence capacitance, zero-sequence capacitance, positive-sequence impedance, zero-sequence impedance, mutual inductance and coupling capacitance, and interphase capacitance.

The instrument complies with the requirements stipulated in the “Procedures for Commissioning and Acceptance of Basic Construction Projects for 110 kV and Above Power Transmission and Transformation Systems,” DL/T 559-94 “Operating and Setting Procedures for Relay Protection Devices in 220–500 kV Power Grids,” and GB 50150-2006.

The instrument features an integrated design with a built-in variable-frequency power supply module, enabling frequency- and voltage-adjustable output. It employs digital filtering technology to eliminate interference from power-frequency electric fields during testing, thereby fundamentally resolving the challenge of accurate measurement under strong electric-field interference.

Product Features

1. Rapid and accurate measurement of positive-sequence capacitance, zero-sequence capacitance, positive-sequence impedance, zero-sequence impedance, and other line parameters; simultaneous measurement of inter-line mutual inductance reactance, coupling capacitance, and phase-to-phase capacitance is also possible.

2. Strong anti-interference capability, enabling accurate measurement even when the ratio of heterofrequency signals to power-frequency signals is as high as 1:10;

3. The external wiring is simple: complete all line parameter measurements with just a single connection to the leads of the line under test, thereby thoroughly resolving the issues associated with existing testing methods, such as cumbersome wiring changes, interference, stability, and accuracy.

4. The instrument is powered by a high-speed microcontroller, integrating the test power supply, instrumentation, and computational model into a single unit, thereby condensing the functionality of an entire truckload of equipment into one compact instrument.

5. The instrument features a 320×240 large-screen dot-matrix LCD display, is operated via an imported rotary mouse, and prints results using a built-in miniature Chinese-character printer.

6. The instrument-based testing process is rapid: the instrument automatically completes the test, measuring one sequence parameter in just one minute, thereby significantly reducing test duration and enabling the workload that would traditionally take a full day to be completed within 20 minutes.

7. High measurement accuracy, with three sets of heterofrequency power supplies: 42.5 Hz/57.5 Hz, 45 Hz/55 Hz, and 47.5 Hz/52.5 Hz.

A set of power-frequency power supplies, 50.0 Hz / 50.0 Hz

It offers selectable options for easily separating power-frequency and spurious interference, thereby effectively enabling high-precision measurement of small signals.

Technical Specifications

Input Power

Three-phase AC 380 V ±10%, 50 Hz

Output maximum voltage

AC 200V, Accuracy: 1%

Output maximum current

5A

Output signal frequency

42.5 Hz/57.5 Hz; 45 Hz/55 Hz; 47.5 Hz/52.5 Hz; 50 Hz/50 Hz

Measurement range

Positive-sequence capacitance

Zero-sequence capacitance

Coupling capacitor

Positive-sequence impedance

Zero-sequence impedance

Mutual inductive reactance

Impedance angle

0.1–50 μF

0.5–400 Ω

0–360°

Measurement resolution

0.01 μF

0.01Ω

0.01°

Measurement accuracy

±3% ±0.05 μF for 0.1 μF to 1 μF

±1.5% ±0.03 μF for 1 μF to 50 μF

±3% ±0.05Ω when 0.5Ω to 1Ω

±3% ±0.03 Ω when 01 Ω to 400 Ω

±0.2° (voltage > 1.0 V)

±0.3° (voltage > 0.2–1.0 V)

External dimensions

535 mm × 435 mm × 360 mm (excluding wheels); weight: 61 kg

Anti-interference parameters

Interference Voltage: The longitudinal induced voltage after connecting the instrument to the test power supply shall be less than 350 V.

Interference current: less than 40 A when the two ends of the line are short-circuited and grounded;

The test can be performed stably and accurately under conditions where the ratio of the instrument’s output signal to the interference signal is 1:10.

Operating Environment

Ambient temperature: -15°C to +40°C Relative humidity: <90%

MCYXC-A Inter-frequency Line Parameter Tester

MCYXC-A Inter-frequency Line Parameter Tester

Model: MCYXC-A Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

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Tel： 86-13307164232

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