Reactive power compensation cabinet

main purpose
Widely applicable to AC 50HZ, rated voltage 400V, 1250KVA and below power transformer distribution systems, for reactive power compensation of inductive loads. Improve the power factor of the line, enhance the quality of electrical energy, and extend the service life of power equipment. The contactor type is suitable for situations where the compensation speed is not required to be too fast; Due to the use of voltage zero crossing triggering technology, the thyristor type has no impact on the system and capacitors, making it suitable for situations that require frequent and rapid compensation. The thyristor 8421 control method is more suitable for systems with multiple compensation stages and large capacity, which is more economical.
This device can also be used in systems with severe harmonics, generally using two solutions One is the non tuning scheme: the capacitor compensation branch is connected in series with a certain proportion of reactors to prevent resonance between the capacitor and the system. This scheme is suitable for situations where only reactive power compensation is required without filtering. Another compensation and filtering scheme requires on-site measurement of the system, using filtering software and simulation system design to achieve harmonic content that meets the requirements of the power supply system while maintaining high performance and cost-effectiveness. Generally, if the main road is a monotonic co filtering circuit.

Technical Features
Strong anti-interference ability, passed the rigorous level III anti-interference test of IEC255-22
Accurate calculation of fundamental current, voltage, reactive power, active power, and power factor under conditions of strong harmonic content
Adopting high-performance microcontrollers, high integration, low cost, and high reliability
Cycle switching capacitors to improve their service life
8421 switching feature: It can complete up to 15 levels of switching under 4-channel control. Improve control accuracy.
Only three buttons, combined with display, make operation convenient and intuitive.
For systems with severe harmonic content, precise control with one-step switching is adopted to avoid overloading caused by single channel input.

Operation Manual
The controller has two states: automatic (automatic light on) and manual (automatic light off), which can be set through the function keys. After power on, the first state is automatic. During automatic operation, the controller automatically switches capacitors based on the detected reactive power; In manual mode, capacitors can be switched by pressing the button.
The controller has two methods: fixed display of power factor and cyclic display of active power (P), reactive power (q), power factor (C), voltage (U), and current (E).
Press the "Function" button to display the number of routes that have been deployed; Press the "Function" button again, the code will display "Q", and the displayed value will show the minimum capacitance capacity, which can be adjusted by pressing the "▲" and "▼" buttons to increase or decrease; Press the "Function" button again, and the code will display "O". The displayed value will show the overvoltage setting value, which can be adjusted using the "▲" and "▼" keys; Press the "Function" button again, and the code will display "L". The displayed value will show the undervoltage setting value, which can be adjusted using the "▲" and "▼" keys; Press the "Function" button again, the code will display "S", and the displayed value will show the delay setting value (unit: seconds), which can be adjusted using the "▲" and "▼" keys; Press the "Function" button again, and the code will display "P". A value of "1" indicates a fixed display power factor, while a value of "2" indicates a cyclic display that can be adjusted using the "▲" and "▼" keys; Press the "Function" button again, the code will display "H", and the displayed value will show the current transformer ratio setting value. For example, "15" represents a current transformer ratio of 1500:5, which can be adjusted using the "▲" and "▼" keys. Press the "Function" button again, the code will display E, and the displayed value will show the number of switching paths, which can be adjusted using the "▲" and "▼" keys;
Note: All parameters of the controller have been set before leaving the factory, please do not adjust them arbitrarily.

Technical parameters
Rated voltage: 380V
Rated current: 5A
Measurement power: 0~999Kvar
Control sensitivity: 100mA
Compensation based on reactive power
Overvoltage preset: 400~420V (return difference 6V)
Undervoltage preset: 300~380V
Delay time: 0S~99S, with a difference of 1S
Single level capacity preset: 0~100Kvar
Current transformer ratio setting: 100/5~3000/5A
Hole size: 113mm × 113m

Ordering Instructions
Controller control mode (control contactor or thyristor)
Control the number of capacitor circuits
Minimum capacitance level difference
Transformation ratio of incoming current transformer
Note: Generally, it is the equal capacity cyclic switching method. If 8421 switching or other methods are required, please make a special statement.
The controller application and wiring diagram are shown in the figure.