NDXB-F Series Substation Electrical Equipment AC Withstand Voltage Resonant Device (Dry-Type)-Wuhan Nanxing Electric Power Technology Co., Ltd.

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NDXB-F Series Substation Electrical Equipment AC Withstand Voltage Resonant Device (Dry-Type)

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Series Resonant Withstand Voltage Test Device

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NDXB-F系列变电站电气设备交流耐压谐振装置(干式)

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■Product Overview

Primarily aimed at 500kV The following is the design and fabrication of AC withstand voltage test equipment for primary electrical apparatus at substations. It can, in accordance with relevant standards, meet the requirements for transformers, GIS System, SF6 Switch, CT/PT , AC withstand voltage tests for capacitive equipment such as insulators, busbars, cables, and bushings. According to 220kV and the test procedures for dielectric withstand voltage of primary electrical equipment at substations of this voltage level or lower, as well as the corresponding handover… / DC withstand voltage test equipment must meet both high-voltage, low-current and low-voltage, high-current test requirements, necessitating a broad operating range. It employs the principle of series resonance, with the variable-frequency power supply control unit serving as its core. ( Control console ) The main equipment consists of an excitation transformer, a reactor, and a capacitive voltage divider. By connecting a rectifier silicon stack and a microammeter to the capacitive voltage divider, a DC withstand voltage test can be performed. Thanks to its excellent filtering characteristics following system resonance, the DC voltage it generates surpasses that obtained from conventional test transformers using rectification. It is an ideal withstand‑voltage testing device for high‑voltage testing departments at the provincial, municipal, and county levels, as well as for power installation, maintenance, and testing contractors.

■ Standard Configuration Table for AC Withstand Voltage Testing of Substation Electrical Equipment

Model Name	Scope of Application (10kV~500kV AC Withstand Voltage Test of Electrical Equipment in Substations by Voltage Level ) Frequency :30-300Hz
Model Name	Variable-frequency source	Reactor	Excitation transformer	Voltage divider	Scope of Application
NDXB-F-50/50/25	3kW	25kV/1A Two units ( Dry type )	3 kVA( Dry type )	50kV	1000kvA and below 10KV Power transformer 10kV Switches, busbars, PT 、 CT Wait 10kV (300mm²) Cable ≤1km
NDXB-F-108/108/27	5kW	27kV/1A Four units ( Dry type )	5 kVA( Dry type)	110kV	31500kvA and below 35kV Power transformer 35kV Switches, busbars, PT 、 CT Wait 35kV (300mm²) Cable ≤0.5km 10kV (300mm²) Cable ≤2.0km
NDXB-F-200/200/50	10kW	50kV/1A Four units ( Dry type )	10 kVA( Dry type )	200kV	50000kvA and below 110kV Power transformer 110kV GIS 、 PT 、 CT Wait ( Preventive testing )35kV(300mm2) Cable ≤1.0km 10kV (300mm²) Cable ≤2.5km
NDXB-F-270/270/45	15kW	45kV/1A Six units ( Dry type )	15kVA ( Dry type )	300kV	50000kvA and below 110kV Power transformer 110kV GIS , switch, PT 、 CT Wait 35kV (300mm²) Cable ≤1.2km 10kV (300mm²) Cable ≤3.0km
NDXB-F-800/400/50	30kW	50kV/2A Eight units ( Dry type ) 100kV/2A Four units	30 kVA( Dry type ) 30kVA	400kV	80000kvA and below 220kV Power transformer 50000kvA and below 110kV Power transformer 110/220kV GIS 、 PT 、 CT Wait 35kV (300mm²) Cable ≤2.0km 110kV (400mm²) Cable ≤0.7 km
NDXB-F-1600/800/200	60kW	200KV/2A Four units	60 kVA( Dry type )	800kV	80000kvA and below 220kV Power transformer 50000kvA and below 110kV Power transformer 500kVGIS、 PT 、 CT Wait 220kV Switch, GIS 、 PT 、 CT Wait 110kV (400mm²) Cable ≤1.5km² 220kV (400mm²) Cable ≤1.0 km

■ Product Specifications

Rated output voltage	0~1000kV and below
Output frequency	30~300Hz
Resonant voltage waveform	Pure sine wave, waveform distortion rate ≤ 1.0%
Work system	Continuous operating time at full power 60min
Quality factor	30~90
Frequency adjustment sensitivity	0.1Hz
Instability degree	<0.05%
Single-phase power supply	220V or three-phase 380V+10%
Power frequency	50Hz ± 5%

■Product Features

Easy to operate : Automatic testing ( Automatic resonance point tracking and automatic voltage boosting ) and manual testing ( Manually searching for the resonance point and manually increasing the voltage ) The two modes cater to different experimental requirements.

It can set 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 output.

Reactors of the same voltage level and capacity have a smaller footprint and lighter weight. ; The temperature rise is small under rated load. ; Adopting dry-type epoxy casting , High mechanical strength , Excellent electrical insulation performance , Beautiful and reliable.

The variable-frequency power supply control cabinet has a large capacity margin. ; Strong protection features ; The output waveform is good. ; Good stability ; Supports multiple operating modes , Easy to operate ; Single-phase 220V Or three-phase 380V The power supply is universal, making on-site power access convenient.

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-F Series Substation Electrical Equipment AC Withstand Voltage Resonant Device (Dry-Type)

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