AC/DC power frequency withstand voltage test equipment

NegotiableUpdate on 05/06

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Nature of the Manufacturer: Producers

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Overview

The AC/DC power frequency withstand voltage test device has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The entire device is lightweight and easy to use on site, using DSP platform technology

Product Details

Meet the scope of the test sample

1、10kV/300mm²AC withstand voltage test for cable 1.5km, capacitance ≤ 0.5632 μ F, test frequency 30-300Hz, test voltage 22kV, test time 5min.

2、35kV/300mm²AC withstand voltage test for cable 0.35km, capacitance ≤ 0.0681 μ F, test frequency 30-300Hz, test voltage 52kV, test time 60min.

3. AC withstand voltage test of 35kV main transformer, capacitance ≤ 0.02 μ F, test frequency 45-65Hz, test voltage not exceeding 68kV, test time 1min.

4. AC withstand voltage test for electrical equipment such as 10kV switches, with a test frequency of 30-300Hz, a test voltage not exceeding 42kV, and a test time of 1 minute.

AC/DC power frequency withstand voltage test devicemajor component

serial number	Device Name	Specification Model	unit	quantity
1	Variable Frequency Power Supply	UHV-4kW	platform	1
2	Incentive Transformer	UHV-4kVA/1.5/3/6kV/0.4kV	platform	1
3	High-voltage reactor	UHV-25kVA/25kV	section	3
4	Capacitive voltage divider	UHV-1000pF/80kV	set	1

hand overDC power frequency withstand voltage test deviceMain technical parameters and functions

Rated capacity	75kVA
rated voltage	25k； 75kV
rated current	3A；1A
measurement accuracy	Effective value of the system at level 1.5
operating frequency	30-300Hz
Device output waveform	sine wave
Quality factors	The device itself has a Q ≥ 30 (f=45Hz)
waveform distortion rate	Output voltage waveform distortion rate ≤ 1%
input power	Single phase 220 or three-phase 380V voltage, frequency 50Hz
working hours	Under rated load, continuous operation for 60 minutes is allowed; Overvoltage 1.1 times for 1 minute
temperature rise	Temperature rise ≤ 65K after 60 minutes of continuous operation under rated load
protection function	Protection functions such as overvoltage, overcurrent, zero start, system detuning (flashover), etc
ambient temperature	－20℃-55℃
relative humidity	≤90%RH
altitude	≤ 3000 meters

Device capacity verification (device capacity is set at 75kVA, divided into three sections of reactors, with a single section of 25kVA/25kV/1A/110H). ）

serial number	experiment	Test frequency	Test current
1	10kV/300mm²AC withstand voltage test for cable 1.5km, capacitance ≤ 0.5632 μ F, test frequency 30-300Hz, test voltage 22kV, test time 5min. If three reactors are connected in parallel, L=110/3=36.7H	f=1/2π√LC=1/(2×3.14×√36.7×0.5632×10^-6)=35.01Hz	I=2πfCU_try=2π×35.01×0.5632×10^-6×22×10³=2.73A
2	35kV/300mm²AC withstand voltage test for cable 0.35km, capacitance ≤ 0.0681 μ F, test frequency 30-300Hz, test voltage 52kV, test time 60min. Use three reactors in series (mutual inductance coefficient 1.2), L=110 × 3 × 1.2=396H	f=1/2π√LC=1/(2×3.14×√396×0.0681×10^-6)=30.65Hz	I=2πfCU_try=2π×30.65×0.0681×10^-6×52×10³=0.68A
3	AC withstand voltage test of 35kV main transformer, capacitance ≤ 0.02 μ F, test frequency 45-65Hz, test voltage not exceeding 68kV, test time 1min. If three reactors are connected in series (with a mutual inductance coefficient of 1.2), then L=110 × 3 × 1.2=396H	f=1/2π√LC=1/(2×3.14×√363×0.02×10^-6)=56.55Hz	I=2πfCU_try=2π×56.55×0.02×10^-6×68×10³=0.48A

Equipment combination method during the experiment

combination method Subject of the test sample	Reactor selection (25kVA/25kV three sections)	Incentive Transformer Output terminal selection	Test voltage (kV)
10kV/300mm²Cable 1.5km	Use three parallel reactors	1.5kV	≤22kV
35kV/300mm²Cable 0.35km	Use three reactors in series	3kV	≤52kV
AC withstand voltage test of 35kV main transformer	Use three reactors in series	6kV	≤68kV
10kV switches and other electrical equipment	Use three reactors in series	3kV	≤42kV

System configuration parameters

（1） Variable frequency power supply UHV-4kW (1 unit)

Rated output capacity	4kW
working power supply	220/380 ± 10% V (single/three-phase), power frequency
output voltage	0-400V
Rated input current	10A
Rated output current	10A
voltage resolution	0.01kV
Voltage measurement accuracy	1.5%
Frequency adjustment range	30-300Hz
Frequency adjustment resolution	≤0.1Hz
frequency stability	0.1%
runtime	Continuous 60 minutes at rated capacity
Component temperature during continuous operation for 60 minutes at rated capacity	≤65K
noise level	≤50dB
Dimensions (length, width, height mm)	400×280×400
weight	About 10kg

（2） Excitation transformer UHV-4kVA/1.5/3/6kV/0.4kV (1 unit)

Rated capacity	4kVA
input voltage	0-400V
output voltage	1.5/3/6kV
structure	dry-type
Dimensions (length, width, height mm)	450×330×430
weight	About 45kg

（3） High voltage reactor UHV-25kVA/25kV (3 sections)

Rated capacity	25kVA
rated voltage	25kV
rated current	1A
inductance	110H/single section
Quality factors	Q≥30(f=45Hz)
structure	dry-type
Size (inner diameter height mm)	∅282×435
weight	About 45kg

（4） Capacitive voltage divider UHV-1000pF/80kV (1 set)

rated voltage	80kV
High voltage electrical capacity	1000pF
Dielectric loss	tgσ≤0.5%
voltage division ratio	1000：1
measurement accuracy	Effective value level 1.5
Size (inner diameter height mm)	∅140×1000
weight	About 8kg

Supply List

serial number	Device Name	Model and Specifications	unit	quantity
1	Variable Frequency Power Supply	UHV-4kW	platform	1
2	Incentive Transformer	UHV-4kVA/1.5/3/6kV/0.4kV	platform	1
3	High-voltage reactor	UHV-25kVA/25kV	section	3
4	Capacitive voltage divider	UHV-1000pF/80kV	set	1
5	Internal connection line		set	1
6	Factory inspection report		copy	1
7	User Manual		copy	1
8	Product Qualification Certificate		copy	1
9	Packing List		copy	1

Reference experimental standards

DL/T 596-1996	Preventive Testing Regulations for Power Equipment
GB50150-2016	Standard for Handover Test of Electrical Equipment in Electrical Installation Engineering
GB10229-88	Reactor
GB1094	Power Transformers
GB1094.1-GB1094.6-96	Degrees of Protection Provided by Enclosures
GB2900	Electrical Terminology and Terminology
GB/T16927.1~2-1997	High Voltage Test Technology
DL/T474.4-2006	Guidelines for on-site insulation testing - AC withstand voltage test
DL/T1015	Guidelines for the use of voltage measurement systems for on-site DC and AC withstand voltage tests
GB/T311.1-1997	Insulation and Coordination of High Voltage Transmission and Transformation Equipment
GB191-2000	Packaging, Storage, and Transportation Symbols
JB/T9641-1999	Test Transformer
IEC358(1990)	Coupling capacitors and capacitive voltage dividers
GB4793-1984	Safety Requirements for Electronic Measuring Instruments
GB/T3859.2-1993	Guidelines for the Application of Semiconductor Inverters
GB/T2423.8-1995	Basic Environmental Testing Regulations for Electrical and Electronic Products
DL/T849.6-2004	General technical specifications for specialized testing instruments for power equipment - Part 6: High voltage resonance test apparatus

Note:

1. The appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice. If there is any act of theft or copying, legal responsibility will be pursued.

2. For more information on ultra-high voltage products, please enter the product center.

workshop floor

The ultra-high voltage self owned factory covers an area of 4500 square meters and has a total of more than 100 employees. The series resonance device is widely used in industries such as power, metallurgy, petroleum, and chemical. It is suitable for the interconnection and preventive testing of large capacity, high-voltage capacitive samples such as power cables, power transformers, hydroelectric generators, GIS, etc.

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