50kV Ultra-Low Frequency High-Voltage Generator

Product Introduction

The MEVLF-W50kV Ultra-Low Frequency High-Voltage Generator is a device developed using American technology and advanced components such as the ARM7 microcontroller. It features a 7-inch touchscreen and backend management software. Overcoming numerous shortcomings of similar products, it offers superior cost-performance compared to imported alternatives. Suitable for withstand voltage testing of high-capacitance equipment like power cables and large/medium-sized generators, it complies with the DL/T849.4-2004 industry standard.

Product Parameter (specification)

Output rated voltage	See table
Output frequencies	0.1Hz, 0.05Hz, 0.02Hz, 0.01Hz
Load capacity	0.5 µF maximum at 0.1 Hz 0.05Hz Maximum 1.1 µF 0.02Hz Maximum 2.2 µF 0.01 Hz Maximum 5.5 µF
Measurement accuracy	3%
Voltage positive and negative peak error	≤3 %
Voltage waveform distortion	≤5 %
Operating conditions	Indoor and outdoor; Temperature
-10 ℃ to +40 ℃; Humidity	≤85 % RH
Power fuse	See table 3
Power supply	voltage 220V±5% , 50±5Hz
Note	If using a portable generator for power, the generator output voltage and frequency must be stable (generally, the power should be greater than 3kW, the frequency 50Hz, and the voltage 220V±5% ).
The capacitance of the test sample shall not exceed the maximum rated capacitance of the instrument, as shown in Table ;

Model	Rated voltage	Load capacity	Power supply Fuse	Product structure, weight
30/1.1	30kV (peak value)	0.1 Hz , ≤0.5 µF	10A	Controller: 4 kg Boost converter: 20kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF
40/1.1	40kV (peak value)	0.1 Hz , ≤0.5 µF	10A	Controller: 4 kg Boost converter: 20kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF
50/1.1	50kV (peak value)	0.1 Hz , ≤0.5 µF	15A	Controller: 4 kg Boost converter: 40kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF
60/1.1	60kV (peak value)	0.1 Hz , ≤0.5 µF	15A	Controller: 4 kg Boost converter: 50kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF
80/1.1	80kV (peak value)	0.1 Hz , ≤0.5 µF	15A	Controller: 4 kg Boost converter: 50kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF
90/1.1	90kV (peak value)	0.1 Hz , ≤0.5 µF	15A	Controller: 4 kg Boost converter: 55kg
		0.05Hz , ≤1.1 µF
		0.02Hz , ≤2.2 µF
		0.01 Hz , ≤ 5.5 µF

Product feature and application

1. Advanced Technology:

Utilizes digital frequency conversion technology with microcomputer control, enabling fully automated testing processes including voltage boosting, voltage reduction, measurement, and protection.

2. User-Friendly Operation:

Simple wiring and foolproof operation.

3. Comprehensive Protection:

Multiple safeguards (overvoltage protection, high/low-side overcurrent protection) with rapid response (action time ≤10ms) ensure instrument safety and reliability.

4. Safe and Reliable:

Low-voltage connection between controller and high-voltage generator with optoelectronic control guarantees secure operation.

Compact Size and Lightweight:

6.Comprehensive Configuration:

Capacitive touchscreen, LCD Chinese character display, automatic storage, and automatic printing.

7. Wide Test Range:

Multiple frequency options (0.1Hz, 0.05Hz, 0.02Hz, and 0.021Hz) for extensive testing capabilities.

8. Compact Size and Lightweight:

Ideal for outdoor operations.

9. Chinese-English Switching Function

Prodection details

Power cables, power capacitors, big and medium-sized generators, electric motors, and other electrical devices with high equivalent capacitance can all benefit from the MEVLF-W50kV Ultra-Low Frequency High-Voltage Generator. In accordance with industrial standards such as DL/T849.4-2004, it may conduct acceptance tests and preventative withstand voltage testing. It can be used both indoors and outdoors, with a temperature range of -10°C to +40°C and a relative humidity of less than 85%. It is a key tool for preventive insulation testing of electrical equipment and can be powered by portable generators (≥3kW).

Company Qualifications

FAQ

1)What are the core components of the MEVLF-W50kV Ultra-Low Frequency High-Voltage Generator, and what are the primary functions of each part?

Answer:
The core of this instrument consists of two main components: the controller and the voltage booster. Their specific functions are as follows:
Controller: Equipped with a 7-inch capacitive touchscreen, printer, USB port, grounding terminal, power switch, and emergency stop button (STOP). Its core functions include parameter configuration (frequency, test duration, voltage/current protection thresholds, etc.), test process control (voltage ramping, shutdown, discharge), data acquisition and display, historical data storage and printing. It also connects to the booster's low-voltage side via photoelectric control to ensure operational safety.
Riser: Primarily converts signals transmitted by the controller into ultra-low-frequency high-voltage output, providing test specimens (e.g., power cables, motors) with high-voltage power meeting test requirements. Its structure is adapted for outdoor operations, with optimized volume and weight design.

2)What preparatory steps must be completed before conducting power cable withstand voltage tests using the MEVLF-W50kV Ultra-Low-Frequency High-Voltage Generator?

Answer:
Three critical preparatory steps must be completed before testing:
Disconnect all electrical equipment connected to the cable under test to prevent interference with test results or damage to other equipment;
Test the insulation parameters of each phase of the cable using a megohmmeter. Only proceed with the ultra-low frequency withstand voltage test after passing this test;
Set the test voltage value according to regulations (using the formula Umax=3Uo, where Uo is the cable's rated phase voltage). Simultaneously, estimate the overcurrent protection setting current based on the cable's capacitance (applying a 1.5 reliability factor) to ensure test parameters meet requirements.

3)How should the MEVLF-W50kV Ultra-Low Frequency High-Voltage Generator be transported and stored for long-term protection when not in use?

Answer:
Transportation and storage must comply with the following requirements:
Transportation: Use cardboard or wooden crates with foam padding for shock absorption to prevent mechanical damage during transit. Transport via road, rail, or air is permissible. Strictly prohibit placement in open-air vehicles to prevent exposure to rain and dust.
Storage: Place indoors at temperatures between -20°C and +60°C, relative humidity ≤85%, with ventilation and no corrosive gases. Do not place directly on the floor or against walls.
Moisture Prevention and Maintenance: In humid regions or seasons, power on the unit for approximately 2 hours monthly to dissipate moisture and protect components. Avoid direct sunlight exposure during outdoor use.

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