UHV-75kVA/75kV Series Resonance Solution

Main components of the device

Serial number	Device name	Specification and model	Unit	Quantity
1	Variable frequency power supply	UHV-4kW	Tower	1
2	Excitation transformer	UHV-4kVA/1.5/3/6kV/0.4kV	Tower	1
3	High voltage reactor	UHV-25kVA/25kV	Section	3
4	Capacitive voltage divider	UHV-1000pF/80kV	Set	1

Main technical parameters and functions

Rated capacity	75kVA
Rated voltage	25k；75kV
Rated current	3A；1A
Measurement accuracy	System RMS level 1.5
Operating frequency	30-300Hz
Device output waveform	Sinusoidal wave
Quality factor	Device Q≥30(f=45Hz)
Waveform distortion rate	Output voltage waveform distortion ≤1%
Input power supply	Single-phase 220 or three-phase 380V voltage, frequency 50Hz
Working hours	Allow continuous 60min under rated load; Overpressure 1.1 times 1 minute
Temperature rise	Temperature rise ≤65K after continuous operation under rated load for 60 minutes
Protection function	Overvoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions
Ambient temperature	－20℃-55℃
Relative humidity	≤90%RH
Altitude	≤3000m

Device capacity verification (device capacity is 75kVA, divided into three reactors, reactor single section is 25kVA/25kV/1A/110H)

Serial number	Test	Test Frequency	Test Current
1	AC withstand voltage test for 10kV/300mm² cable 1.5km, capacitance ≤0.5632μF, test frequency 30-300Hz, test voltage 22kV, test time 5min, using three reactors in parallel, then L=110/3=36.7H	f=1/2π√(LC)=1/(2×3.14×√(36.7×0.5632×10⁻⁶))=35.01Hz	I=2πfCU=2π×35.01×0.5632×10⁻⁶×22×10³=2.73A
2	AC withstand voltage test for 35kV/300mm² cable 0.35km, capacitance ≤0.0681μF, test frequency 30-300Hz, test voltage 52kV, test time 60min, using 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=2π×30.65×0.0681×10⁻⁶×52×10³=0.68A
3	AC withstand voltage test for 35kV main control, capacitance ≤0.02μF, test frequency 45-65Hz, test voltage not exceeding 68kV, test time 1min, using three reactors in series (mutual inductance coefficient 1.2), then L=110×3×1.2=396H	f=1/2π√(LC)=1/(2×3.14×√(396×0.02×10⁻⁶))=55.55Hz	I=2πfCU=2π×55.55×0.02×10⁻⁶×68×10³=0.48A

Equipment combination method during testing

Test Object Combination Method	Reactor Selection (25kVA/25kV Three Sections)	Excitation Transformer Output Selection	Test Voltage (kV)
10kV/300mm ² Cable 1.5km	Use three reactors in parallel	1.5kV	≤22kV
35kV/300mm ² Cable 0.35km	Use three reactors in series	3kV	≤52kV
35kV Transformer Multiple Current Withstand Test	Use three reactors in series	6kV	≤68kV
10kV Switch and Other Electrical Equipment	Use three reactors in series	3kV	≤42kV

System Configuration Parameters

(一) Variable Frequency Power Supply UHV-4kW (1 unit)

Rated Output Capacity	4kW
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%
Operating Time	Continuous 60min at Rated Capacity
Maximum Component Temperature at Continuous 60min Operation at Rated Capacity	≤65K
Noise Level	≤50dB
Dimensions (L×W×H mm)	400×280×400
Weight	Approximately 10kg

(二) 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 (L×W×H mm)	450×330×430
Weight	Approximately 45kg

(三) High Voltage Reactor UHV-25kVA/25kV (3 units)

Rated Capacity	25kVA
Rated Voltage	25kV
Rated Current	1A
Inductance	110H/unit
Quality Factor	Q≥30(f=45Hz)
Structure	Dry Type
Dimensions (Inner Diameter×Height mm)	282×435
Weight	Approximately 45kg

(四) Capacitive Voltage Divider UHV-1000pF/80kV (1 set)

Rated Voltage	80kV
High Voltage Capacitance	1000pF
Dielectric Loss	tgσ≤0.5%
Voltage Division Ratio	1000:1
Measurement Accuracy	Effective Value 1.5 Grade
Dimensions (Inner Diameter×Height mm)	140×1000
Weight	Approximately 8kg

Delivery List

No.	Equipment Name	Model and Specifications	Unit	Quantity
1	Variable Frequency Power Supply	UHV-4kW	Unit	1
2	Excitation Transformer	UHV-4kVA/1.5/3/6kV/0.4kV	Unit	1
3	High Voltage Reactor	UHV-25kVA/25kV	Section	3
4	Capacitive Voltage Divider	UHV-1000pF/80kV	Set	1
5	Internal Connection Cables		Set	1
6	Factory Inspection Report		Copy	1
7	User Manual		Copy	1
8	Product Certificate		Copy	1
9	Packing List		Copy	1

Reference Test Standards

DL/T 596-1996	"Preventive Test Code for Electric Power Equipment"
GB50150-2016	"Standard for Handover Testing of Electrical Equipment in Electrical Installation Engineering"
GB10229-88	"Reactors"
GB1094	"Power Transformers"
GB1094.1-GB1094.6-96	"Degrees of Protection Provided by Enclosures"
GB2900	"Electrotechnical Terminology"
GB/T16927.1~2-1997	"High Voltage Test Techniques"
DL/T474.4-2006	"Guide for Insulation Test Implementation on Site - AC Withstand Voltage Test"
DL/T1015	"Guide for the Use of Voltage Measurement Systems for On-site DC and AC Withstand Voltage Tests"
GB/T311.1-1997	"Insulation Coordination and Insulation of High Voltage Power Transmission and Transformation Equipment"
GB191-2000	"Pictorial Markings for Packaging and Storage"
JB/T9641-1999	"Test Transformers"
IEC358(1990)	"Coupling Capacitors and Capacitor Dividers"
GB4793-1984	"Safety Requirements for Electronic Measuring Instruments"
GB/T3859.2-1993	"Application Guide for Semiconductor Converters"
GB/T2423.8-1995	"Basic Environmental Testing Procedures for Electrical and Electronic Products"
DL/T849.6-2004	"General Technical Specifications for Special Test Instruments for Power Equipment Part 6: High Voltage Frequency Tuning Test Devices"

Note:

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