●Product introduction
Product name: 300kW without partial discharge frequency conversion power supply
Product specifications: 300kW frequency conversion power system without partial discharge
Applicable test product: 220kV transformer
Test product range: 220kV transformer partial discharge and induction withstand voltage test
General conditions of use:
Maximum temperature: 40℃ (use) 50℃ (storage);
Minimum temperature: -10℃ (use) -20℃ (storage);
Maximum daily temperature difference: 25K
Sunlight intensity: 0.1W/cm2;
Altitude: ≤2000m;
Maximum wind speed: 18.7m/s;
Maximum environmental relative humidity (at 20°C): 95%;
Earthquake intensity: 7 degrees;
Pollution level: Level IV (climbing distance: 31mm/kV, calculated according to the highest working voltage);
Use place: outdoor;
Storage location: indoor;
No fire and explosion hazard;
Does not contain corrosive metal and insulating gas;
There is a reliable grounding point, and the grid resistance is less than 0.5Ω;
The partial discharge interference level of the power supply is less than 100pc;
The inclination of the equipment installation site is less than 5 degrees
basic skills:
It has the ability to resist electric field interference. Under strong electric field interference, the measurement accuracy and control protection meet the requirements.
With good magnetic shielding, the components and leads are shielded by high-permeability materials, and there is no space radiation;
It has complete protection functions, which can meet the short-circuit test of the outlet under full load conditions; it is equipped with start, stop and emergency opening buttons;
With the function of setting test time, the timing range is 0 to 99 minutes, the timing accuracy is 0.1 second, and the sound reminder is provided at the end of the time period;
With input and output terminal connection convenient and reliable; the main circuit is equipped with air circuit breaker and AC contactor at the same time; with power start and stop buttons and emergency stop switches;
With buttons for coarse and fine adjustment of voltage increase and decrease;
With buttons for coarse and fine frequency adjustment;
With automatic recognition of the phase sequence of the cooling fan and automatic selection of the direction of the fan;
Equipped with an independent power supply for the instrument, the power is isolated and output by a transformer, the output power is 500W, single-phase AC 220V, 60Hz. It can be used as a working power source for "partial discharge instrument", "control box", "oscilloscope", "charger", etc.
Equipped with an independent synchronous power supply, which can be used for synchronous test frequency when the partial discharge instrument measures the partial discharge signal. The output power of each synchronous power supply is 100W, 100VAC.
Equipped with low temperature heating device to ensure normal operation under low temperature conditions (within minus 20 degrees).
The parallel expansion capacity function is reserved. When the output function of the variable frequency power supply cannot meet the test needs, the capacity can be increased by connecting more power supplies in parallel. The upgrade interface is reserved when producing variable frequency power supplies.
Automatic and manual test selection (test voltage, test time, automatic tuning, automatic voltage increase and decrease, etc. can be set);
With overvoltage protection, overcurrent protection setting value adjustment function;
Protective function:
This system is composed of multiple protections to achieve different functions. To ensure that the test product and the operator will not be harmed during the test, and at the same time, advanced intelligent methods are used,
In the test, even misoperation will not cause harm to the tested product and the operator (for example, if the variable frequency power supply device forgets to ground, it will not affect the operation of the system,
It will not endanger personal safety; if the key is wrong in the test, the system will not perform the wrong operation).
1. Short circuit protection: When the output of the frequency conversion cabinet is short-circuited, the output is automatically cut off.
2. Output over-voltage protection: presets can be set arbitrarily, and the output is automatically cut off when the output of the complete set of devices reaches the protection setting value.
3. Overcurrent protection: When the output current of the frequency conversion cabinet reaches the protection setting value, the output is automatically cut off.
4. Breakdown flashover protection: When a flashover to ground occurs on the high-voltage side, the output can be automatically cut off.
5. Boot zero protection: the boost must be zero, otherwise the output will not start.
6. Inverter overload protection: When the output current exceeds the set current, the control box automatically turns off the output of the variable frequency power supply, and there is a corresponding prompt at this time.
7. Power failure protection: When the input power supply is suddenly cut off, the system can use the remaining power in the circuit to shut down the output signal in time to ensure the safe shutdown of the system.
8. Detune protection: When the test product is detuned due to internal defects and the parameters of the test system are detuned, the control box automatically turns off the output.
9. Bridge arm voltage protection: The DC working voltages of the four power amplifier arms are displayed. When the voltage of the four power amplifier arms is unbalanced, the control box will automatically alarm or shut down the system.
10. Efficacy protection (power curve protection): By measuring the output voltage and current, monitoring the load impedance and phase, the active and reactive power output of the variable frequency power supply is limited to ensure that the variable frequency power supply is not damaged. And it will automatically prompt to re-adjust the output of the excitation transformer to achieve a suitable impedance matching and then perform the test.
11. Cooling fan linkage protection: When the phase sequence of the fan power supply is connected incorrectly, the frequency conversion power supply automatically adjusts the phase sequence to achieve the automatic selection of the fan direction.
12. Transportation anti-vibration protection: anti-vibration disc spring is designed at the bottom of the frequency conversion cabinet to buffer the vibration caused by uneven road surface.
13. Phase loss protection: When the input power is missing phase and cannot work normally, the screen will display phase loss and shut down the system at the same time.
14. Power supply over-voltage protection.
The main body is separated from the control, display, and protection. The main body and the protection are integrated, and the control and display are another whole. The control and display are easy to carry on site.
●Technical parameters
Measurement display:
Display the voltage of each power amplifier bridge arm separately, which can monitor the working status of the host;
Display of output voltage, current, frequency, output voltage and output current phase and output voltage waveform of variable frequency power supply;
High voltage side voltage measurement;
Outlet wind temperature display;
Display output waveform;
Various protection actions display;
Can be displayed in three languages: "Simplified Chinese", "Traditional Chinese", "English"
Frequency conversion power control box:
The weight of the control box is 10kg, which is very easy to carry.
The connection between the power cabinet body of the variable frequency power supply and the control box and the voltage divider and the control box are all connected by optical fiber, which can be completely isolated to ensure the personal safety of the operator and the control box itself is not damaged by discharge.
It has real-time display of the working status of the frequency conversion cabinet and real-time display of high-voltage measurement.
It has the function of identifying each host. Since the entire system is operated in parallel, there is a communication fiber between each host and the control box. When the host and the optical fiber do not correspond, the control box can report an error prompt in time.
The power supply of the control box can be selected from the variable frequency power supply cabinet. The required working power supply is 220VAC, 50/60Hz, 100W.
Buttons of the control box: boost and buck, coarse and fine adjustment buttons; frequency coarse and fine adjustment buttons; countdown button, menu selection button, automatic tuning button.
Frequency conversion power control box display and control functions:
1. Output voltage: The output voltage is the output voltage value of the variable frequency power supply, and the displayed value is the effective value of the sine wave.
2. Output frequency: the frequency value of the sine wave voltage output by the variable frequency power supply, with a frequency resolution of 0.1 Hz. The frequency can be adjusted by the frequency control button or automatically tuned by the control box.
3. Output current: the output current of the variable frequency power supply. When the output current exceeds the set current, the control box will automatically turn off the output of the variable frequency power supply. At this time, there should be a corresponding prompt.
4. System status: When the system is abnormal, there should be an abnormal prompt.
5. Input voltage: When the input power is under-voltage, unbalanced or lack of phase, the corresponding protection circuit in the control box will act and display the corresponding information.
6. Bridge arm voltage: The DC working voltage of the four power amplifier arms of each host should be displayed. When the four voltages are unbalanced, the control box will automatically alarm or shut down the system, and it is convenient to check the fault tube area, and display corresponding information when abnormal .
7. Outlet air temperature: The outlet air temperature of each host is displayed separately, prompting corresponding information.
8. Overcurrent setting: It can be set. When the output current reaches this value, the control box will automatically turn off the output of the variable frequency power supply and prompt the corresponding information.
9. When the output current of the frequency conversion cabinet reaches the protection setting value, the whole set of devices will be automatically cut off and the "output current failure" will be displayed.
10. Function switching, respectively switching to display the working status between different hosts.
