Partial Discharge Monitor

The partial discharge monitor is based on many years of experience in partial discharge detection by our company's technicians, which is suitable for online partial discharge detection and positioning of high-voltage equipment.

The system is equipped with composite TEV sensors, ultra-high frequency sensors, high-frequency current transformers and high-sensitivity ultrasonic sensors to collect partial discharge signals inside high-voltage equipment. The system uses multi-level detection and frequency reduction technology to reduce the frequency of the discharge signal. At the same time, it uses a high-speed AD conversion circuit to complete the digitization of the signal. It also uses digital signal processing, adaptive filtering and other interference signal processing methods to ensure the reliability of the detected data. By collecting different signals generated by internal partial discharges of different high-voltage equipment, the operating status of the equipment can be quickly charged. The instrument can be installed and tested in the operating state of the equipment, and has no impact on the normal operation of the equipment. It is convenient for the staff to evaluate the operating state of the switchgear in time, and greatly improves the reliability, safety and effectiveness of the equipment operation.

The partial discharge monitor consists of the tester host, TEV sensor, ultrasonic sensor, high frequency current transformer, ultra high frequency sensor and connecting wire.

1 Scope of application

It is suitable for on-line detection and positioning of partial discharge of switch cabinets, transformers and GIS.

2 Use environment

Altitude: ≤3000m

Ambient temperature: -20～60℃

Relative humidity: ≤95%

3 Technical parameters

Instrument measurement parameter requirements

(1) TEV measurement

Sensor: capacitive; measuring range: 0～60dBmV;

Resolution: 1dB; Error: ±1dB;

Detection bandwidth: 5~70MHz; Maximum pulse/period: 655;

Threshold adjustment range: 3～57dB.

(2) High frequency current transformer

Detection frequency band: 10kHz～30MHz Signal transmission method: 50Ω coaxial cable

Detection sensitivity: 10pC

(3) Ultrasonic sensor:

Measurement range: -7dBμV～68 dBμV; Resolution: 1dB;

Error: ±1dB; Sensor sensitivity: -65dB (0dB = 1volt/μbar effective value SPL);

Sensor center frequency: 20～50kHz; Sensor diameter: no more than 50mm;

Heterodyne frequency: 38.4kHz.

(4) UHF sensor

Detection frequency band: 300MHz～1.5GHz Signal transmission method: 50Ω coaxial cable

Detection sensitivity: 1dB gain: >65dbm

Hardware requirements

Shell: It has a protective shell, and the protection level should reach or be better than IP53;

Connector: earphone jack, low-voltage DC charger input, external ultrasonic sensor input;

Host weight: not more than 3kg;

Display screen: LED display, and can display battery status.

Power supply requirements

Internal battery: equipped with rechargeable battery, with automatic shutdown function when the battery voltage is low;

Battery continuous working time: more than 6 hours in single-channel mode, more than 3 hours in multi-channel mode;

Battery charging: It can be charged with 220V power frequency power supply, and the charging time is not more than 8 hours;

Battery charger protection level: IP54.

partial discharge monitor Host front panel

The front panel of the partial discharge monitor host is divided into several functional areas, which are marked according to the above icons:

1. Waveform display area

2. F1~F5: Menu button

3. Power indicator

4. MEAS: Measurement menu

5. AUTORANGE: Automatic AUTO

6. MENU OFF: Close the menu option

7. MENU: Menu button

8. AUTO: Automatic setting button

9. RUN/STOP: start/stop

10. Arrow keys

11. TRIG: Trigger menu

12. LEVEL: Adjust the trigger level

13. TIME/DIV: Time base

14. POSITION: Adjust the horizontal trigger position

15. HORI: Horizontal Menu

16. VERTICAL: Adjust the vertical position

17. VOLTS: Voltage range

18. Power switch

19. REF: REF menu

20. MATH: MATH function key

21. CH2: Display the CH2 menu

22. CH1: Display the CH1 menu

23. UTILITY: Accessibility

24. SAVE RECALL: save/recall

25. RECORDER: Multimeter trend chart, oscilloscope trend chart, waveform recorder

26. SCOPE/DMM: Function interface switch button, switch to the multimeter signal source interface

27. CURSOR: Cursor measurement

1. Daily maintenance

When storing or placing the main unit, do not expose the LCD display to direct sunlight for a long time.

Note: To avoid damaging the host or sensor, do not place it in mist, liquid or solvent.

2. Clean

According to the requirements of operating conditions, check the host and sensor frequently. Please clean the outer surface of the instrument according to the following steps:

1) Use a lint-free rag to remove the floating dust outside the host and sensor. Please be very careful to avoid scratching the clean filter material of the display.

2) Use a soft cloth dampened with water to clean the host. For more thorough cleaning, use 75% isopropanol in water.

Note: To avoid damaging the surface of the host or sensor, do not use any corrosive reagents or chemical cleaning reagents.