First, the test object and test requirements 1. AC withstand voltage test for 0.5km of 110kV/300mm2 cable, capacity ≤ 0.0735uF, test frequency 30-300Hz, test voltage 128kV, test time 60min. 2. AC withstand voltage test of 2km 35kV/300mm2 cable, capacity ≤ 0.389uF, test frequency 30-300Hz, test voltage 52kV, test time 60min. 3, 110kV/63000kVA main transformer fully insulated AC withstand voltage test, capacity ≤ 0.02uF, test frequency 45-65Hz, test voltage does not exceed 160kV, test time 1min. 4. AC withstand voltage test of 110kV switch, switchgear, insulator and other electrical equipment, test frequency 30-300Hz, test voltage 265kV, test time 1min. Second, the working environment 1. Ambient temperature: -100C -500C; 2. Relative humidity: ≤90%RH; 3. Altitude: ≤1000 meters; Third, the main technical parameters and functions of the device 1. Rated capacity: 405kVA; 2. Input power: single-phase 220 or three-phase 380V voltage, frequency is 50Hz; 3. Rated voltage: 45kV; 90kV; 135kV; 270kV 4. Rated current: 9A; 4.5A; 3A; 1.5A 5. Working frequency: 30-300Hz 6. Device output waveform: sine wave 7. Waveform distortion rate: output voltage waveform distortion rate ≤ 1%; 8. Working time: Allow continuous 60min under rated load; overpressure 1.1 times 1 minute; 9. Temperature rise: temperature rise ≤ 65K after 60min continuous operation under rated load; 10. Quality factors: the device itself Q≥30 (f=45Hz); 11. Protection function: Overcurrent, overvoltage, and flashover protection of the test object for the product under test (see the variable frequency power supply section for details); 12. Measurement accuracy: system effective value of 1.5; Fourth, the equipment follows the standard GB10229-88 Reactor GB1094 "Power Transformer" GB50150-2006 "Electrical Apparatus Installation Engineering Electrical Equipment Transfer Test Standard" DL/T 596-1996 "Protection test regulations for electrical equipment" GB1094.1-GB1094.6-96 Shell Protection Level GB2900 Terminology of Electrical Engineering GB/T16927.1~2-1997 "High Voltage Test Technology" Fifth, determine the capacity of the device Designing six reactors, the single reactor is 67.5kVA/45kV/1.5A/85H, and the total capacity of the device is 405kVA. Verification: AC withstand voltage test of 1,35kV/300mm2 length 2km cable, capacity ≤ 0.389uF, test frequency 30-300Hz, test voltage 52kV, test time 60min. Use two reactors in series (coefficient 1.05) to connect three groups in parallel, then L=85×2×1.05/3=59.5 H , then: Test frequency: f=1/2π√LC=1/(2×3.14×√59.5×0.389×10-6)=33Hz Test current: I = 2πfCU test = 2π × 33 × 0.389 × 10 -6 × 52 × 103 = 4.19A 2. AC withstand voltage test for 0.5km of 110kV/300mm2 cable, capacity ≤ 0.0735uF, test frequency 30-300Hz, test voltage 128kV, test time 60min. Use three reactors in series (coefficient 1.2) Two groups in parallel, then L = 85 × 3 × 1.2/2 = 153H, then: Test frequency: f=1/2π√LC=1/(2×3.14×√153×0.0735×10-6)=47.6Hz Test current: I = 2πfCU test = 2π × 47.6 × 0.0735 × 10 - 6 × 128 × 103 = 2.81A The capacity of the device is set to 405kVA/270kV, divided into six reactors, and the reactor is 67.5kVA/45kV/1.5A/85H in a single section. The use of reactors in series and in parallel can meet the test requirements of the above-mentioned test objects. List of equipment usage relationships during testing Subjects Reactor 67.5 kVA/45kV six sections Incentive transformer Output selection 35kV/300mm 2 length 2km cable Use reactor two sections in series Three parallels 4kV 110kV switch, switch, insulator Using reactor six-section series 16kV 110kV/300mm2 cable 0.5km Use reactor three sections in series Two sets of parallel 4kV 110kV/63000kVA main transformer Use reactor four-section series 8kV Sixth, system configuration and its parameters 1. Incentive transformer JLB-18kVA/4/8/16kV/0.4kV a) Rated capacity: 18kVA; b) Input voltage: 0-400V, single phase; c) Output voltage: 4/8/16kV d) Structure: dry; e) Weight: about 90kg; 2. Frequency conversion power supply BPXZ-F -18kW/220/380V 1 a) Rated output capacity: 18kW b) Working power: 220/380±10%V (single/three-phase), power frequency c) Output voltage: 0 – 400V, single phase, d) Rated input current: 45A e) Rated output current: 45A f) Voltage resolution: 0.01kV g) Voltage measurement accuracy: 1.5% h) Frequency adjustment range: 30 – 300Hz i) Frequency adjustment resolution: ≤0.1Hz j) Frequency stability: 0.1% k) Running time: continuous 60min under rated capacity l) The maximum temperature of the components in continuous operation 60min under rated capacity ≤ 65K; m) Noise level: ≤50dB n) The following functions can be achieved 1) The placement of frequency conversion power supply is vertical and horizontal, which is especially suitable for on-site operation and observation; 2) The inner and outer parts are equipped with special shock-absorbing rubber supporting feet and protective aluminum boxes, which can effectively reduce the jolt vibration during transportation and the impact during lifting. Ensure the long-term stability and reliability of the variable frequency power supply; 3) Parameter display: touch or external mouse large-screen LCD interface display system Resonance voltage (ie target voltage set before test), test frequency, measurement frequency, low voltage voltage, low voltage current, withstand voltage time, overvoltage protection, overcurrent protection, flashover protection, phase boost and phase timing, operation Mode switching, capacitance, inductance, frequency swap calculation, parameter query, etc. It can also display frequency curve, voltage curve, etc. It can intuitively judge the accuracy and stability of the test's resonant frequency. 4) parameter settings: large-screen touch LCD color screen and an external mouse to complete the setting of various parameters, can start frequency, stop frequency, start voltage, stage boost and timing, measure the voltage divider ratio, incentive change Ratio, overvoltage protection, overcurrent protection, flashover protection, test mode, capacitance and inductance frequency interchange calculation, parameter setting prompts and help and other parameters are set or selected; 5) Test mode: touch screen and external mouse operation, automatic, semi-automatic, manual three operating states. With boost, tuning (including manual, automatic), segmented pressurization and timing, running status, mode switching, fault indication, capacitance and inductance frequency swap calculation function; 6)Protection function and information prompt: It has multiple protection functions such as high-voltage over-voltage protection, low-voltage over-current and over-current protection, and de-tuning protection, zero-position, flashover protection, emergency shutdown, and undervoltage protection. 7) Data storage function: Save test results (manual save), print, upload, check back, etc. 1 Test result: After the manual or automatic test is completed, detailed parameters of the test can be displayed in the test result interface. When the test is interrupted, the interrupt status can be indicated. The parameters can be stored in memory, the memory is non-volatile memory, can save 50 test records; 2 Data query: The saved test result data can be displayed on the screen, with USB interface at the same time, the data output can be printed or printed by the printer carried by the device; (The printer is customer's choice, if the customer has this requirement, it must be in the contract. In particular, 8) Automatic voltage regulation function: The system automatically tracks and maintains a stable test voltage according to the set test voltage or manual boosting result, and the voltage stability can reach 1.0%; 9) Frequency range and frequency resolution can be set: Frequency range can be set to 30 ~ 300Hz, 45 ~ 100Hz, 200-300Hz, set on demand, can speed up the tuning process; frequency resolution can be preset to 0.1 according to need Hz, 0.2Hz, 0.5Hz, or 1.0Hz, to achieve an optimal balance between tuning efficiency and tuning accuracy; 10) The frequency adjustment is divided into coarse and fine adjustment, and the test resonance point can be automatically found to ensure that the resonance frequency does not drift during the entire test process; P) Weight: about 22kg; 3. High voltage reactor DK-67.5kVA/45kV 6 sections a) Rated capacity: 67.5kVA; b) Rated voltage: 45kV; c) Rated current: 1.5A; d) Inductance: 85H/single block; e) Quality factors: Q≥30 (f=45Hz); f) Structure: dry; g) Weight: about 68kg; 4. Capacitor divider FR-270kV/500pF 1 set a) Rated voltage: 270kV; b) High piezoelectric capacity: 500pF c) Dielectric loss: tgσ≤0.5%; d) Partial pressure ratio: 3000:1 e) measurement accuracy: effective value of 1.5; f) Weight: about 26kg; Custom Puzzle,Oem Jigsaw Puzzle,Customized Jigsaw Puzzle,Customize Image Jigsaw Puzzle NINGBO PAPER GAMES KINGDOM CO.,LTD , https://www.papergameskingdom.com