Pang Yuliang

Pangyu Liang Spark-135/108 Variable Frequency Series Resonant Voltage Endurance Test System Product Introduction:
Product model: Spark-135/108
Product brand: Pang Yuliang
Product category: Transformer testing instrument
Product note: Variable frequency series resonant withstand voltage test system

Pangyu Liang Spark-135/108 Variable Frequency Series Resonant Voltage Endurance Test System Product Overview:
This device is mainly designed and manufactured for the AC withstand voltage test of all electrical main equipment such as 35kV and below power main transformers and busbar switches. The reactor adopts multiple separate designs, which can meet the requirements of high voltage and low current equipment testing conditions, as well as the requirements of low voltage AC withstand voltage testing such as 10kV cables. It has a wide range of applications and is an ideal withstand voltage equipment for high voltage testing departments and power installation and maintenance engineering units at the prefecture, city, and county levels.
The device mainly consists of a variable frequency power supply, an excitation transformer, a reactor, and a capacitive voltage divider.
Advantages of series resonance in power systems:
1. The required power capacity is greatly reduced. Series resonant power supply generates high voltage and high current through resonance between resonant reactor and the tested capacitor. In the entire system, the power supply only needs to provide the active consumption part of the system. Therefore, the required power supply for the experiment is only 1/Q of the test capacity.
2. The weight and volume of the equipment have been greatly reduced. In a series resonant power supply, not only is the bulky high-power voltage regulating device and ordinary high-power power frequency test transformer eliminated, but the resonant excitation power supply only requires 1/Q of the test capacity, greatly reducing the system weight and volume, usually 1/10-1/30 of ordinary test devices.
3. Improve the waveform of the output voltage. A resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the accidental breakdown of the test sample by harmonic peaks.
4. Prevent large short-circuit currents from burning the fault point. In the series resonance state, when the weak point of the insulation of the test sample is broken down, the circuit immediately disengages and the loop current rapidly drops to 1/Q of the normal test current. However, when conducting voltage withstand tests in parallel resonance or test transformer mode, the breakdown current immediately increases by several tens of times. Compared with the two, the short-circuit current is hundreds of times different from the breakdown current. So, series resonance can effectively identify insulation weaknesses without the concern of large short-circuit currents burning the fault point.
5. There will be no overvoltage recovery. When the test sample breaks down, due to the loss of resonance conditions, the high voltage immediately disappears, the arc immediately extinguishes, and the process of re establishing the recovery voltage is long. It is easy to disconnect the power supply before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and does not result in any recovery overvoltage.
Main functions and technical characteristics of frequency modulation resonance device:
1. The device has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The overvoltage and overcurrent protection values can be set according to user needs. When the test sample flashes, the flashover protection action can be taken and the flashover voltage value can be recorded for experimental analysis.
2. The entire device is lightweight, with a maximum weight of no more than 40kg, making it easy to use on site.
3. The device has three working modes, which facilitate users to flexibly choose according to the on-site situation and improve the testing speed. The working modes are: fully automatic mode, manual mode, automatic tuning, and manual boost mode
4. It can store data with numerical numbers, making it convenient for users to identify and search.
5. When the device automatically scans the frequency, the starting point of the frequency can be set arbitrarily within the specified range, and the scanning direction can be selected upwards or downwards. At the same time, the LCD screen displays the scanning curve, making it convenient for users to intuitively understand whether the resonance point has been found.
6. Adopting DSP platform technology, it is convenient to add or remove functions and upgrade according to user needs, making the human-machine exchange interface more user-friendly.

Pang Yuliang Spark-135/108 Variable Frequency Series Resonant Voltage Endurance Test System Product Parameters:
（1） Spark - refers to the manufacturer's code
135 refers to the maximum rated capacity that the device can output, measured in kVA
108 refers to the voltage level that the equipment can output, measured in kV;
（2） Technical specifications of Spark-135kVA/108kV variable frequency series resonant withstand voltage test device
1. Rated voltage:
27kV - meets the AC withstand voltage test of 10kV cable;
54kV - meets the AC withstand voltage test of 10kV system and 35kV cable;
108kV - meets the AC withstand voltage test of 35kV system;
2. Distortion rate of output voltage waveform:<1.0% 3. Allowable continuous working time: 60 minutes of one-time operation under rated conditions 4. Device quality factor: Q>50
5. Quality factor at full load during thermal power generator testing: Q>10 (load dependent)
6. Quality factor under full load during cable testing: Q>30 (load dependent)
7. Quality factor of main transformer test at full load: Q>30 (load dependent)

8. GIS， Quality factor of switch and other tests at full load: Q>50 (load dependent)
   9. Input power supply: single-phase 380V
   10. Frequency adjustment range: 20Hz~300Hz
   11. System measurement accuracy: 1.5%
   12. The device has protection functions such as overvoltage, overcurrent, and zero start
   （3） Equipment follows standards
   Standard for Handover Test of Electrical Equipment in Electrical Equipment Installation Engineering GB50150-2006
   High voltage resonance test device "DL/T 849.6-2004
   Reactor GB10229.88
   Preventive Test Code for Power Equipment DL/T596-1996
   Coupling capacitors and capacitive voltage dividers "IEC358 (1990)
   （4） Main equipment configuration and technical parameter description:
   1. One variable frequency power supply:
   Rated power: 7.5kVA;
   Input voltage: single-phase 220V or three-phase 380V ± 10% 45-65Hz
   Output voltage: adjustable from 0 to 400V
   Output voltage frequency: 30-300Hz
   0.1Hz step adjustable
   Frequency instability ≤ 0.02%
   Output current: 0-18A
   2. High voltage resonant reactors (4 units in total): 27kV/1.25A
   Rated working voltage: 27kV
   Rated working current: 1.25A
   Rated inductance: 100H
   Continuous working time: 60 minutes
   Temperature rise: less than 60 degrees
   Working frequency: 30-300Hz
   3. Motivate to become one:
   Rated capacity: 7.5kVA
   Input voltage: 200V/400V
   Output voltage: 1.2kV/3kV/5kV, 1.2kV is used for AC withstand voltage test of cables below 10kV; 3kV is used for 35kV cables, 10kV substation system AC withstand voltage test, and 5kV is used for 35kV substation system AC withstand voltage test.
   4. One capacitor voltage divider: 110kV pure capacitor type:
   Self capacitance: 1000pF
   Working frequency: 30-300Hz
   Uncertainty: 1.5%
   Rated voltage: 110kV/1000pF
   5. One set of testing lines and accessories:
   1) 1 set of internal connecting wires
   2) 1 copy of user manual
   3) One test report