Partial Discharge Tester for High Voltage Switchgear

Product Introduction

When partial discharge occurs, it generates physical phenomena such as ultrasonic waves, heat, light, and magnetic fields. Among these, ultrasonic waves propagate spherically outward from the source. The MEJFD-103 Partial Discharge Inspection and Location Instrument for High-Voltage Switchgear utilizes the ultrasonic signals generated by partial discharges to determine their presence and location. Combined with real-time image and data displays, it enables rapid diagnosis of partial discharge conditions. This locator integrates both transient earth voltage and ultrasonic detection methods.

Product Parameter (specification)

2.1 TEV Performance Parameters
1) Sensor	Capacitive;
2) Measurement Range	-5 to 60 dB, 1 dB increments;
3) Resolution	1 dB.
3.2 Ultrasonic Measurement Parameters
1) Measurement Range	-11 dB to 68 dB, 1 dB increments;
2) Resolution	1 dB;
3) Sensor Center Frequency	40kHz ±1kHz;
4) Sensor Diameter	16mm.
2.3 Instrument Hardware Specifications
1) Display	Color backlit LCD;
2) Display Resolution	320X240;
3) Horizontal Sensitivity	50μs/Div ~ 2ms/Div;
4) Vertical sensitivity	4 μV/Div ~ 400 μV/Div (ultrasonic);400 μV/Div ~ 40 mV/Div (TEV);
5) Trigger modes	Auto, Norm, Sign;
6) PC interface	USB connection;
7) Charging method	Dedicated charger;
8) Data storage	Supports SD card storage;
9) Operating Time	4 to 5 hours per full charge;
10) Controller	Membrane Keypad;
11) Connectors	2.1mm low-voltage DC charger input;
2.5mm stereo headphone jack;
1) External ultrasonic sensor input;
2) Headphones	Minimum 8 ohms.
2.4 Operating Environment
1) Operating Temperature	-10 to 45°C;
2) Humidity	0–90% RH, non-condensing;
2.5 Dimensions
1) Dimensions	Main Unit 245×132×45 mm; Parabolic Reflector Diameter;275 mm;
2) Weight	1 kg (Main Unit) 0.5 kg (Sensor);
2.6 Battery Charger
1) Rated Voltage	90–264 V AC;
2) Frequency	47–63 Hz;
3) Charging Voltage	12 V DC;
4) Charging Current	500 mA;
5) Full Charge Time	5 hours.
2.7 External Parabolic Ultrasonic Sensor Parameters
1) Sensor Center Frequency	40 kHz;
2) Sensor Diameter	16 mm;
3) Parabolic Reflector Outer Diameter	275 mm;
4) Parabolic Reflector Standard Diameter	250 mm;
5) Weight	0.6 kg;
6) Operating Temperature	-10 to 50 °C;
7) Humidity	0–90% relative humidity, non-condensing.

Product feature and application

● Ultrasonic and TEV partial discharge waveforms are displayed alongside yellow, green, and red warning thresholds on a single interface-a domestic first.

● Measures partial discharge magnitude using transient earth voltage (TEV) detection in dBmV units;

● Features a color LCD screen for more intuitive and user-friendly display;

● Includes headphone monitoring mode for real-time listening to partial discharge signals during ultrasonic testing;

● Automatically stores test data for easy record retrieval and subsequent analysis;

● User-friendly design with compact size, lightweight construction, and portability.

Prodection details

Suitable for partial discharge detection and localization in high-voltage and medium-voltage switchgear, enabling rapid diagnosis of partial discharge conditions.

Company Qualifications

FAQ

1)What two detection methods are integrated into the MEJFD-W103 High-Voltage Switchgear Partial Discharge Inspection and Location Instrument?

Answer: This location instrument integrates transient earth voltage (TEV) and ultrasonic detection methods. It can determine the presence and location of discharges by receiving signals generated by partial discharges.

2)What are the requirements for plugging and unplugging the external sensor connection cable when using the MEJFD-W103 High-Voltage Switchgear Partial Discharge Inspection Locator?

Answer: The external sensor connection cable must be plugged or unplugged only when the main unit is powered off. Operating while powered on may damage the instrument or affect detection accuracy.

3)How can I assist in identifying partial discharge signals in ultrasonic mode on the MEJFD-W103 High-Voltage Switchgear Partial Discharge Inspection and Localization Instrument?

Answer: In ultrasonic mode, insert the dedicated headphones and adjust the volume. Identify discharge signals by listening for a hissing sound (similar to sizzling in a frying pan). Additionally, the instrument features a laser aiming function. When used with a transparent reflector, it enables precise targeting to assist in detecting surface discharges at close or distant ranges.

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