35kV Series Resonance Test Equipment Product Introduction
Transformers, GIS systems, SF6 switches, CT/PT, insulators, busbars, cables, bushings, and other capacitive equipment are the most common primary electrical equipment in substations. According to the test regulations for withstand voltage of primary electrical equipment in substations at 220V and below, the corresponding AC/DC withstand test equipment must not only meet the test conditions of high voltage and low current but also meet the conditions of low voltage and high current, requiring a wide range of applicability. Using the principle of series resonance, the main equipment consists of a variable frequency power supply control box (operating console), an excitation transformer, reactors, and a capacitive voltage divider. By connecting a rectifier stack and a microammeter to the capacitive voltage divider, DC withstand voltage tests can be completed. Due to the excellent filtering characteristics after system resonance, the DC voltage produced is comparable to that rectified from a conventional test transformer. It is an ideal withstand voltage device for municipal, county-level high-voltage testing departments and power installation, repair, and testing engineering units.
◆ Reference schemes for resonance test device configuration:
A. Reference scheme for cable resonance test device configuration
B. Reference scheme for generator resonance test device configuration
C. Reference scheme for substation electrical equipment resonance device configuration
D. Reference scheme for CVT calibration resonance boosting device configuration
Series Resonance Test Equipment Product Aliases
AC withstand voltage resonance device, variable frequency resonance, variable frequency series resonance, series resonance, series resonance transformer,
Product Features
1. Reactors of the same voltage level and capacity are smaller in size and lighter in weight; temperature rise is minimal at rated load; dry-type epoxy casting ensures high mechanical strength, excellent electrical insulation performance, and aesthetic reliability
2. The variable frequency power supply control box has ample capacity margin; strong protection functions; good output waveform; good stability; multiple working modes for convenient operation; compatible with single-phase 220V or three-phase 380V input power, facilitating on-site power access
3. Flexible configuration. Different types of reactors can be selected to meet various test requirements, achieving multi-purpose use with high cost-effectiveness
Technical Specifications:
| Rated Output Voltage |
0～1000kV and below |
| Output Frequency |
30～300Hz |
| Resonant Voltage Waveform |
Pure sine wave, waveform distortion rate ≤1.0% |
| Duty Cycle |
Continuous operation at full power for 60 minutes |
| Quality Factor |
30～90 |
| Frequency Adjustment Sensitivity |
0.1Hz |
| Instability |
＜0.05% |
| Power Supply |
Single-phase 220V or three-phase 380V±10% |
| Power frequency 50Hz±5% |
Series Product Configurations and Applicable Scope:
| Product Model and Name |
Applicable Scope (AC withstand voltage equipment for substation electrical equipment at 10kV～500kV voltage levels, frequency 30～300Hz) |
| Variable Frequency Source |
Resonant Reactor |
Excitation Transformer |
Voltage Divider |
Applicable Scope |
| BPXZ-50/50/25 |
3kW |
25kV/1A Two units
(Dry-type) |
3kVA
(Dry-type) |
50kV |
1000kVA and below 10kV power transformers
10kV switches, busbars, PT, CT, etc.
10kV (300mm2) cable ≤1.0km |
| BPXZ-108/108/27 |
5kW |
27kV/1A Four units
(Dry-type) |
5kVA
(Dry-type) |
110kV |
31500kVA and below 35kV power transformers
35kV switches, busbars, PT, CT, etc.
10kV (300mm2) cable 2km
35kV (300mm2) cable 0.5km |
| BPXZ-200/200/50 |
10kW |
50kV/1A Four units
(Dry-type) |
10kVA
(Dry-type) |
200kV |
50000kVA and below 110kV power transformers
110kV GIS, PT, CT, etc. (preventive tests)
35kV (300mm2) cable ≤1.0km
10kV (300mm2) cable ≤2.0km |
| BPXZ-270/270/45 |
15kW |
45kV/1A Six units
(Dry-type) |
15kVA
(Dry-type) |
300kV |
50000kVA and below 110kV power transformers
110kV GIS, PT, CT, etc.
35kV (300mm2) cable ≤1.2km
10kV (300mm2) cable ≤3.0km |
| BPXZ-800/400/50 |
30kW |
50kV/2A Eight units
(Dry-type)
100kV/2A Four units
(Oil-immersed) |
30kVA
(Dry-type)
30kVA
(Oil-immersed) |
400kV |
80000kVA and below 220kV power transformers
50000kVA and below 110kV power transformers
110kV/220kV GIS, PT, CT, etc.
35kV (300mm2) cable ≤2.0km
110kV (300mm2) cable ≤0.7km |
| BPXZ-1600/800/200 |
60kW |
200kV/2A Four units
(Oil-immersed) |
60kVA
(Dry-type) |
800kV |
80000kVA and below 220kV power transformers
50000kVA and below 110kV power transformers
500kV GIS, PT, CT, etc.
220kV switches, GIS, PT, CT, etc.
110kV (400mm2) cable ≤1.5km
220kV (400mm2) cable ≤1.0km |
Note: Customized solutions can be provided based on test object parameters
