■ Product overview

OWTS QW-30 series is an integrated partial discharge positioning system, mainly used for partial discharge diagnosis of medium voltage cables. The system test frequency is damped AC voltage (DAC) from 20 Hz to several hundred hertz.

The peak value of the damped AC voltage generated by the system during the test can reach 60kV, and the diagnosis is carried out by combining advanced system hardware and system software, including:

The latest transistor technology and laser control technology, such as high-voltage transistor switches;

Electronic components, digital signal processing, such as high-voltage transistor switches, high-voltage sources;

Digital signal processor and filter;

Wireless connection and computer built-in system: including partial discharge detector, control unit and partial discharge analyzer.

QW-30 mainly detects 10KV and 35KV cable systems. The position of partial discharge can be accurately positioned. The loss factor can be measured at the same time as the partial discharge detection to determine the aging of the cable insulation. This means that users can perform a comprehensive diagnosis of the health of the cable in the shortest possible time. 

■ Features 

▲ With automatic partial discharge calibration function

▲ Withstand voltage test function in line with international standards

▲ Describe the level and trend of partial discharge during the withstand voltage test

▲ Automatically calibrate cable length, joint position and wave speed

▲ Simultaneously locate the location of multiple partial discharge defects

▲ With built-in TDR calibration test function

▲ Three pressure modes: peak voltage, phase voltage multiples, and effective value voltage

▲ Phase and partial discharge spectrum display function

▲ Auto discharge function

▲ Real-time partial discharge level and position display function

▲ Switch display of partial discharge level and number of partial discharges

▲ Equipped with simulation software to completely reproduce the analysis process of field test data

▲ Equipped with a USB interface for easy data transmission and system software upgrades

▲ Cable partial discharge test and positioning: use low-damping oscillatory wave power supply for partial discharge test

▲ It can measure the initial voltage and level of partial discharge, and accurately locate the position of partial discharge defects

▲ The PD capture card must be an industrial-grade board

▲ The A/D converter of the data acquisition device is not less than 14Bit

▲ The equipment analysis software can be connected unlimitedly, no password dog is allowed, and any working computer can be used and upgraded for free

▲ The analysis software can be compatible with the test data of imported mainstream products on the market

▲ The software has VLF withstand voltage and partial discharge test functions

▲ The software has dual-end positioning function

▲ Equipped with a self-drying system to avoid internal interference of the instrument caused by humid weather

▲ Select at least 5 measurement intervals for windowing analysis

▲ The compensation capacitor supports external impedance measurement to eliminate the influence of test leads on positioning errors

▲ Must have damping fault curve correction function

▲Measurement function and analysis function are in a set of software, measurement and analysis must be able to be carried out at the same time

■ Technical parameters

System parameters DAC QW-30

Output voltage 60 kV (peak) / 42,4kV (RMS)

DAC frequency range 20Hz~500 Hz (acc. IEC 60060-3)

The capacitance value range of the measured object is 0,025 µF~8 µF

Partial discharge test range / partial discharge resolution 1 pC~100nC / 0.1 pC

Measuring the bandwidth of the partial discharge signal 100~500 kHz (acc. IEC 60270)

Connector positioning in calibration mode is integrated

Partial discharge positioning Wide-band, 100kHz~20MHz automatic adjustment

Power supply single phase, 94~250V, 48~63Hz, 500VA

Size Diameter: Ca. 620mm Height: Ca. 1200mm

Weight 75 kg

On-site handling Aluminum alloy handling rod

Signal control is controlled by a computer connected to the device through a network cable

Software ohv diagnostic suite

Including TDR, location map, PRPDA pattern recognition, import other test data formats, generate test reports

DAC oscillator partial discharge test unit / oscillator output voltage: 0~60kV self-interference level:<1pc<>

Oscillation wave output frequency: 20~1000Hz Outer sheath test: 3~10kV

Measurable cable capacitance: 8uF Outer sheath precise point: pulse 1:3/1:5/1:9

Inductance: 2.5H dedicated integrated software, can integrate control and operation of all the above equipment

Partial discharge detection range: 1pC~100nC Chinese operation interface

Resolution: ±0.1pC