Cable Resonance Testing Solution for Variable-Frequency Series Resonant Withstand Voltage Test Equipment
发布时间：2025-02-08
Variable-frequency series resonant dielectric withstand test apparatus
HTXZ-75kVA/75kV
I. Meeting the Scope of Test Specimens
1 , 10kV/300mm 2 AC withstand voltage test for a 1.5 km cable, with a capacitance ≤ 0.5632 µF, test frequency of 30–300 Hz, test voltage of 22 kV, and test duration of 5 minutes.
2, 35kV/300mm 2 The AC withstand voltage test for a 0.35 km cable has a capacitance of ≤0.0681 µF, an test frequency of 30–300 Hz, a test voltage of 52 kV, and a test duration of 60 minutes.
3. For the AC withstand voltage test of the 35 kV main transformer, the capacitance shall not exceed 0.02 µF, the test frequency shall be 45–65 Hz, the test voltage shall not exceed 68 kV, and the test duration shall be 1 minute.
4. For AC withstand voltage tests of 10 kV switchgear and other electrical equipment, the test frequency shall be 30–300 Hz, the test voltage shall not exceed 42 kV, and the test duration shall be 1 minute.
II. Main Components of the Device
Serial number | Device Name | Unit | Quantity |
1 | Variable-frequency power supply | Taiwan | 1 |
2 | Excitation transformer | Taiwan | 1 |
3 | High-voltage reactor | Festival | 3 |
4 | Capacitive voltage divider | set | 1 |
III. Main Technical Parameters and Functions
1. Rated Capacity: 75kVA
2. Rated Voltage: 25kV；75kV
3. Rated Current: 3A；1A
4. Measurement accuracy: System RMS value 1.5 level
5. Operating frequency: 30-300Hz
6. Device output waveform: sine wave
7. Quality factor: the device itself Q ≥ 30(f=45Hz)
8. Waveform Distortion Rate: Output voltage waveform distortion rate ≤ 1%
9. Input power supply: Single-phase 220 V or three-phase 380 V, with a frequency of 50 Hz.
10. Operating Time: Continuous operation is permitted under rated load. 60min ; Overvoltage 1.1 times 1 minute
11. Temperature Rise: Continuous operation under rated load 60min Maximum temperature rise ≤ 65K
12. Protection Functions: Protection functions including overvoltage, overcurrent, zero‑position start-up, and system detuning (flashover)
13. Ambient temperature: – 20 °C -55 °C
14. Relative humidity: ≤ 90%RH
15. Altitude: ≤ 3000 rice
IV. Verification of Installed Capacity
The equipment capacity is rated at 75 kVA, comprising three reactor sections, with each section rated at 25 kVA/25 kV/1 A/110 H.
Verification: 1 , 10kV/300mm 2 AC withstand voltage test for a 1.5 km cable, with a capacitance ≤ 0.5632 µF, test frequency of 30–300 Hz, test voltage of 22 kV, and test duration of 5 minutes.
If three reactor sections are connected in parallel, then L = 110/3 = 36.7 H; therefore:
Test frequency: f = 1/(2π√LC) = 1/(2 × 3.14 × √(36.7 × 0.5632 × 10⁻⁶)) -6 )=35.01Hz
Test current: I = 2πfCU Try =2π×35.01×0.5632×10 -6 ×22×10 3 =2.73A
2, 35kV/300mm 2 The AC withstand voltage test for a 0.35 km cable has a capacitance of ≤0.0681 µF, an test frequency of 30–300 Hz, a test voltage of 52 kV, and a test duration of 60 minutes.
Use three reactors connected in series (with a mutual inductance coefficient of 1.2); L = 110 × 3 × 1.2 = 396 H.
Test frequency: f = 1/(2π√LC) = 1/(2 × 3.14 × √(396 × 0.0681 × 10⁻⁶)) -6 )=30.65Hz
Test current: I = 2πfCU Try =2π×30.65×0.0681×10 -6 ×52×10 3 =0.68A
3. For the AC withstand voltage test of the 35 kV main transformer, the capacitance shall not exceed 0.02 µF, the test frequency shall be 45–65 Hz, the test voltage shall not exceed 68 kV, and the test duration shall be 1 minute.
When three reactor sections are connected in series (with a mutual inductance coefficient of 1.2), the total inductance L is calculated as follows: L = 110 × 3 × 1.2 = 396 H. Therefore:
Test frequency: f = 1/(2π√LC) = 1/(2 × 3.14 × √(363 × 0.02 × 10)) -6 )=56.55Hz
Test current: I = 2πfCU Try =2π×56.55×0.02×10 -6 ×68×10 3 =0.48A
Meet the experimental requirements.
V. Equipment Configuration During Testing
Combination method Test subject | Reactor Selection (25 k VA/25 k V three sections) | Excitation transformer Output Selection | Test voltage ( kV ) |
10kV/300mm2 Cable 1.5 km | Use three reactor sections in parallel. | 1.5kV | ≤22kV |
35kV/300mm2 Cable 0.35 km | Use three reactor sections connected in series. | 3kV | ≤52kV |
AC withstand voltage test of the 35 kV main transformer | Use three reactor sections connected in series. | 6kV | ≤68kV |
10 kV switchgear and other electrical equipment | Use three reactor sections connected in series. | 3kV | ≤42kV |
VI. System Configuration Parameters
(1) Variable-frequency power supply HTXZ-6kW 1 unit
1) Rated output capacity: 6 kW
2) Power supply: 220/380 ±10% V (single/three-phase), mains frequency
3) Output voltage: 0–400 V
4) Rated input current: 15 A
5) Rated output current: 15 A
6) Voltage resolution: 0.01 kV
7) Voltage measurement accuracy: 1.5%
8) Frequency adjustment range: 30–300 Hz
9) Frequency adjustment resolution: ≤0.1 Hz
10) Frequency stability: 0.1%
11) Operation Time: Continuous for 60 under rated capacity min
12) Under rated capacity, the maximum temperature of components during continuous operation for 60 minutes shall not exceed 65 K.
13) Noise Level: ≤50 dB
14) Dimensions (Length × Width × Height, mm): 400 × 280 × 400
15) Weight: approximately 10kg
(II) Excitation transformer 6 kVA / 1.5 / 3 / 6 kV / 0.4 kV, 1 unit
1) Rated capacity: 6 kVA
2) Input voltage: 0–400 V
3) Output voltage: 1.5/3/6 kV
4) Structure: Dry-type
5) Dimensions (Length × Width × Height, mm): 450 × 330 × 430
6) Weight: approximately 45k g
(3) High-voltage reactor 25 kVA/25 kV, 3 sections
1) Rated capacity: 25 kVA;
2) Rated voltage: 25 kV
3) Rated current: 1A
4) Inductor Quantity: 110H per cell
5) Quality factor: Q ≥ 30 (f = 45 Hz)
6) Structure: Dry-type
7) Dimensions (inner diameter × height, mm): ∅282×435
8) Weight: approximately 45kg
(4) Capacitive voltage divider, 1000 pF / 80 kV, 1 set
1) Rated voltage: 80 kV
2) High-voltage capacitance: 1000 pF
3) Dielectric loss: tan δ ≤ 0.5%
4) Partial pressure Ratio: 1000:1
5) Measurement accuracy: 1.5 class for RMS values
6) Dimensions (inner diameter × height, mm): ∅ 140×650
7) Weight: approximately 8k g
VII. Supply List
Serial number | Set Alternative Name | Unit | Quantity |
1 | Variable-frequency power supply | Taiwan | 1 |
2 | Excitation transformer | Taiwan | 1 |
3 | High-voltage reactor | Festival | 3 |
4 | Capacitive voltage divider | set | 1 |
5 | Internal connection cable | set | 1 |
6 | Factory Inspection Report | portion | 1 |
7 | Instruction Manual | portion | 1 |
8 | Certificate of Conformity | portion | 1 |
9 | Packing List | portion | 1 |
VIII. Reference Experimental Standards
DL/T 596-1996 “Preventive Test Procedures for Power Equipment”
GB 50150-2016 “Standard for Handover Tests of Electrical Equipment in Electrical Installation Projects”
GB 10229-88 “Reactors”
GB 1094 "Power Transformers"
GB1094.1–GB1094.6-96 "Degrees of Protection Provided by Enclosures"
GB 2900 “Electrotechnical Terminology”
GB/T 16927.1–2:1997 “High-Voltage Test Techniques”
DL/T 474.4-2006 “Guidelines for the Implementation of On-site Insulation Testing – AC Withstand Voltage Test”
DL/T 1015 Guidelines for the Use of On-site DC and AC Withstand Voltage Test Voltage Measurement Systems
GB/T 311.1-1997 “Insulation and Coordination of High-Voltage Transmission and Transformation Equipment”
GB 191-2000 “Packaging and Storage & Transportation Pictorial Markings”
JB/T 9641-1999 “Testing Transformer”
IEC 358 (1990) “Coupling Capacitors and Capacitive Voltage Dividers”
GB4793-1984 “Safety Requirements for Electronic Measuring Instruments”
GB/T 3859.2-1993 “Guidelines for the Application of Semiconductor Converters”
GB/T 2423.8-1995 “Basic Environmental Testing Procedures for Electrical and Electronic Products”
DL/T 849.6-2004 “General Technical Requirements for Specialized Testing Instruments for Power Equipment – Part 6: High-Voltage Resonant Test Systems”
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