35kV Series Resonant 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 test 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 equipment for high-voltage testing departments at the prefecture, city, and county levels, as well as for power installation, repair, and testing engineering units.
◆ Reference schemes for resonant test device configuration:
A. Reference scheme for cable resonant test device configuration
B. Reference scheme for generator resonant test device configuration
C. Reference scheme for substation electrical equipment resonant device configuration
D. Reference scheme for CVT calibration resonant boosting device configuration
Series Resonant Test Equipment Product Aliases
AC withstand voltage resonant device, variable frequency resonant, variable frequency series resonant, series resonant, series resonant transformer,
Product Features
1. Reactors of the same voltage level and capacity are smaller in size and lighter in weight; temperature rise is small at rated load; dry-type epoxy casting provides high mechanical strength, good electrical insulation performance, and is aesthetically pleasing and reliable
2. The variable frequency power supply control box has a large 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, making it convenient for on-site power access
3. Flexible configuration. Different types of reactors can be selected to meet different test object requirements, achieving multi-purpose use of one machine with high cost performance
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% |
Working Power Supply |
Single-phase 220V or three-phase 380V±10% |
Power frequency 50Hz±5% |
Series Product Configuration and Applicable Scope:
Product Model and Name |
Applicable Scope (AC withstand voltage equipment for electrical equipment in substations with voltage levels from 10kV to 500kV, 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 |
10kV power transformers up to 1000kVA
10kV switches, busbars, PT, CT, etc.
10kV (300mm2) cables ≤1.0km |
BPXZ-108/108/27 |
5kW |
27kV/1A Four units
(Dry type) |
5kVA
(Dry type) |
110kV |
35kV power transformers up to 31500kVA
35kV switches, busbars, PT, CT, etc.
10kV (300mm2) cables 2km
35kV (300mm2) cables 0.5km |
BPXZ-200/200/50 |
10kW |
50kV/1A Four units
(Dry type) |
10kVA
(Dry type) |
200kV |
110kV power transformers up to 50000kVA
110kV GIS, PT, CT, etc. (preventive tests)
35kV (300mm2) cables ≤1.0km
10kV (300mm2) cables ≤2.0km |
BPXZ-270/270/45 |
15kW |
45kV/1A Six units
(Dry type) |
15kVA
(Dry type) |
300kV |
110kV power transformers up to 50000kVA
110kV GIS, PT, CT, etc.
35kV (300mm2) cables ≤1.2km
10kV (300mm2) cables ≤3.0km |
BPXZ-800/400/50 |
30kW |
50kV/2A Eight units
(Dry type)
100kV/2A Four units
(Oil-immersed type) |
30kVA
(Dry type)
30kVA
(Oil-immersed type) |
400kV |
220kV power transformers up to 80000kVA
110kV power transformers up to 50000kVA
110kV/220kV GIS, PT, CT, etc.
35kV (300mm2) cables ≤2.0km
110kV (300mm2) cables ≤0.7km |
BPXZ-1600/800/200 |
60kW |
200kV/2A Four units
(Oil-immersed type) |
60kVA
(Dry type) |
800kV |
220kV power transformers up to 80000kVA
110kV power transformers up to 50000kVA
500kV GIS, PT, CT, etc.
220kV switches, GIS, PT, CT, etc.
110kV (400mm2) cables ≤1.5km
220kV (400mm2) cables ≤1.0km |
Note: Customized solutions can be provided based on the parameters of the test object.
