High Voltage Cable and Transmission Line Test Instrument Transmission Line Parameter Tester

• Customization: Available
• After-sales Service: Yes
• Warranty: 1 Year
• Input Power: Three Phase AC380V ± 10%, 50Hz
• Maximum Current: 5A
• Measurement Resolution: 0.01μf
• Power: Electronic
• Customized Support: OEM, ODM, Obm, Software Reengineering
• Signal Frequency: 42.5Hz/57.5Hz;45Hz/55Hz;47.5Hz/52.5Hz;50Hz/50Hz
• Transport Package: Carton or Wooden Case
• Trademark: KDZD
• Origin: Hubei, China
• HS Code: 9030332000
• Production Capacity: 500 Pieces

Product Description

 

Overview

Input power	three phase AC380V ± 10%, 50Hz
output	AC 200V accuracy: 1%
Maximum current
Output	5A
Maximum current
signal frequency	42.5Hz/57.5Hz;45Hz/55Hz;47.5Hz/52.5Hz;50Hz/50Hz
Measurement range	positive sequence capacitance	positive sequence impedance	impedance angle
	Zero sequence capacitance	Zero sequence impedance
	Coupling capacitance	Mutual inductance reactance
	0.1~50μF	0.5~400Ω	0~360°
Measurement resolution	0.01μF	0.01Ω	0.01°
Measurement accuracy	0.1μF~1μF	0.5Ω~1Ω	±0.2°(voltage>1.0V)
	±3%±0.05μF	±3%±0.05Ω	±0.3°(voltage>0.2~1.0V)
	1μF~50μF	01Ω~400Ω
	±1.5%±0.03μF	±3%±0.03Ω
Overall dimension	620 mm × 500 mm × 600mm (including wheels); Weight: 79kg
Operating environment ambient temperature	Ambient temperature: - 15 ºC ~ + 40 ºC relative humidity: < 90%
Anti interference parameters	Interference voltage: the longitudinal induced voltage after connecting the instrument test power supply is less than 350V;
	Interference current: < 40A when both ends of the line are short circuited and grounded;
	It can stably and accurately complete the test under the condition that the ratio of the output signal of the instrument to the interference signal is 1:10.

 

 

 

Key introduction

1. Grounding terminal: used for system safety grounding When testing phase-to-phase impedance and phase-to-phase capacitance, it is necessary to open the connecting piece between the ground terminal and UN, and the UN terminal is suspended
2. Test power output: used for current signal output
3. Test signal input: used for voltage signal input
4. Safety tube: used to protect equipment
5. Power input: equipment power input, three-phase AC380V
6. Printer: used to print test reports
7. Touch screen: display various function menus and operate various functions
8. Stop key: emergency interrupt key in case of emergency
9. Reset key: press this key to reset the system in case of failure
10.Power switch: responsible for equipment power supply

Product Introduce
Before the new high-voltage transmission line is put into operation, in addition to checking the insulation of the line and checking the phase, various power frequency parameter values should also be measured as the actual basis for calculating the short-circuit current of the system, setting relay protection, calculating the power flow distribution and selecting a reasonable operation mode. Generally, the parameters to be measured include DC resistance R, positive sequence impedance Z1, zero sequence impedance Z0, positive sequence capacitance C1 and zero sequence capacitance C0, and inter phase capacitance C12.

For multiple circuits erected on the same pole or lines with short distance and long parallel section, the coupling capacitance cm and mutual inductance impedance ZM shall also be measured.

Before measuring parameters, it is necessary to record relevant design data of the line, such as line name, voltage class, line length, tower type, conductor model and cross section, and make a test plan according to these data and site conditions.

In the traditional test of power frequency parameters of transmission lines, three-phase autotransformer and large capacity isolation transformer are used to provide the test power supply, CT and Pt used for power measurement are used for electrical signal conversion, and finally, pointer type high-precision voltmeter, ammeter and power meter are used to measure various electrical parameters, and finally the test results of power frequency parameters of transmission lines are calculated. This makes the whole set of test equipment bulky and heavy, requiring the cooperation of cranes, which is very unfavorable for on-site measurement. Moreover, since the test power supply is a power frequency power supply, it is very easy to mix with the coupled power frequency interference signal, resulting in large measurement error. It is necessary to greatly improve the signal-to-noise ratio, which further improves the capacity and volume of the power supply.

This instrument can accurately measure the power frequency parameters (positive sequence capacitance, zero sequence capacitance, positive sequence impedance, zero sequence impedance, mutual inductance and coupling capacitance, phase-to-phase capacitance, etc.) of various high-voltage transmission lines (overhead, cable, overhead cable hybrid, multi circuit erection on the same tower).

The instrument meets the requirements of the code for start-up acceptance of basic construction projects of 110 kV and above power transmission and transformation, DL / t559-94 code for operation and setting of relay protection devices of 220-500kV power grid and gb50150-2016.

The instrument adopts an integrated structure, with a built-in variable frequency power supply module, and can output power with variable frequency and voltage regulation. The digital filtering technology avoids the interference of power frequency electric field to the test, and fundamentally solves the problem of accurate measurement under strong electric field interference.

Product parameters
1. It can quickly and accurately complete the measurement of positive sequence capacitance, zero sequence capacitance, positive sequence impedance, zero sequence impedance and other parameters of the line, and also measure the mutual inductance reactance, coupling capacitance and inter phase capacitance between lines;
2. It has strong anti-interference ability and can measure accurately when the ratio of different frequency signal to power frequency signal is 1:10;
3. The external wiring is simple, and all line parameters can be measured only by connecting the lead wire of the tested line once; Completely solve the problems of cumbersome test wiring switching, interference, stability, accuracy and other aspects of existing test methods.
4. The instrument takes high-speed single-chip microcomputer as the core, realizes the integration of test power supply, instrument and calculation model, and condenses a truck of equipment into an instrument.
5. The instrument adopts 8-inch color touch screen display and embedded Chinese character micro printer to print the results;
6. The test process of the instrument is fast, the instrument automatically completes the test, completes the measurement of one sequence parameter in one minute, and the test time is shortened,
The workload of traditional method for one day can be completed in 20 minutes;
7. High measurement accuracy, easy separation of power frequency and clutter interference, effectively achieving high-precision measurement of small signals;