NDXB-Y Series AC Withstand Voltage Resonant Test System for Power Cables (Oil-Immersed Type)-Wuhan Nanxing Electric Power Technology Co., Ltd.

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NDXB-Y Series AC Withstand Voltage Resonant Test System for Power Cables (Oil-Immersed Type)

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Series Resonant Withstand Voltage Test Device

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NDXB-Y系列电力电缆交流耐压谐振装置(油浸式)

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■Product Overview

Used for 10kV、35kV、110kV For AC withstand voltage testing of cables, the variable-frequency series resonance withstand test utilizes the inductance of a reactor and the capacitance of the device under test to achieve capacitive resonance, thereby generating high voltage and large current across the test specimen. The AC withstand voltage test system for cables primarily consists of a variable-frequency power supply. ( Host ) It consists of an excitation transformer, a reactor, and a capacitive voltage divider.

The frequency adjustment range is 30~300Hz , in compliance with the enterprise standards issued by China Southern Power Grid Company ( The “Regulations for Preventive Testing of Power Equipment” can not only meet the requirements of high-voltage… XLPE It meets the voltage withstand requirements for cables and is lightweight. ( The weight of a single component shall not exceed 30kg) Its excellent portability makes it well suited for field testing.

■ Common Configuration Table for Variable-Frequency Resonance in AC Withstand Voltage Testing of Cables

35kV Configuration Table for Withstand Voltage Testing Equipment for Cables of 1 kV and Below
Model Name	Control box	Reactor	Excitation transformer	Voltage divider	Scope of Application
NDXB-F - 44/22	2.5kW	1A/22kV Two units	2.5KVA/1kV	25kV	10kV Cable ≤1km
ND XB-F- 88/22	4kW	2A/22kV Two units	4KVA/1kV	25kV	10kV Cable ≤2km
NDXB-F - 132/22	6kW	2A/22kV Three units	6KVA/1/3kV	60kV	10kV Cable ≤3km 35kV Cable ≤1km
NDXB-F - 176/22	7.5kW	2A/22kV Four units	7.5KVA/3kV	60kV	10kV Cable ≤4km 35kV Cable ≤1km
NDXB-F - 264/22	10kW	2A/22kV Six units	10KVA/1/3kV	60kV	10kV Cable ≤6km 35kV Cable ≤2km
NDXB-F - 330/22	15kW	2.5A/22kV Six units	15KVA/1kV	100kV	10kV Cable ≤8km 35kV Cable ≤2km
NDXB-F - 640/22	25kW	2A/22kV Eight units	25KVA/1/3/5kV	200kV	10kV Cable ≤10km 35kV Cable ≤4km 110kV Cable ≤1km

110kV Configuration Table for Withstand Voltage Testing Equipment for Cables of 1 kV and Below
Model Name	Control box	Reactor	Excitation transformer	Voltage divider	Scope of Application
NDXB-F- 1300/130	50kW	5A/130kV Two units	505KVA/1/3/5kV	150kV	35kV Cable ≤2km 110kV Cable ≤2km
NDXB-F- 260/130	100kW	5A/130kV Four units	100KVA/1/3/5/10kV	220kV	35kV Cable ≤3km 110kV Cable ≤3km 220kV Cable ≤1.5km
NDXB-F- 3200/220	160kW	4A/220kV Four units	160KVA/5/10kV	220kV	110kV Cable ≤5km 220kV Cable ≤3km
NDXB-F-6400/220	320kW	8A/220kV Four units	320KVA/5/10kV	320kV	110kV Cable ≤10km 220kV Cable ≤5km 500kV Cable ≤1km

■ Product Specifications

Rated output voltage	0~220kV
Output frequency	30~300Hz
Resonant voltage waveform	Pure sine wave, waveform distortion rate ≤ 1.0%
Full-load operating time	Continuous working hours 60min
Quality factor	30~90
Frequency adjustment sensitivity	0.1Hz
Instability degree	<0.05%
Power supply	Single-phase 220V or three-phase 380V ± 15% , power frequency 50Hz ± 5%

■Product Features

Easy to operate : Automatic tuning ( Automatic resonance point search ) , Automatic Testing ( Automatic resonance point tracking and automatic voltage boosting ) and manual testing ( Manually searching for the resonance point and manually boosting the voltage ) The three modes cater to different test requirements. They allow adjustment of the test voltage, frequency‑modulation range, protection current, and pressurization time.

Automatic mode : Simply set the test voltage and duration; the equipment automatically and precisely adjusts frequency and voltage, completes the test, and saves the data.

It features ground fault and flashover protection.

It can automatically track changes in grid voltage and adjust the voltage in real time, ensuring stable high-voltage levels.

Easy to operate ; Single-phase 220V Or three-phase 380V The power supply is universal, making on-site power access convenient.

Reactors of the same voltage level and capacity are smaller in size and lighter in weight. ; The temperature rise is small under rated load. ; Adopting dry-type epoxy casting , High mechanical strength and excellent electrical insulation properties. , Beautiful and can be concealed.

Flexible configuration : The reactor can be connected in series. / It can be used in parallel to meet the requirements of various test specimens, enabling multi‑purpose operation with high cost‑effectiveness.

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NDXB-Y Series AC Withstand Voltage Resonant Test System for Power Cables (Oil-Immersed Type)

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