SGB High voltage reactive power automatic compensation device
1. Overview
The high-voltage reactive power automatic compensation device is connected in parallel to the 10kV power frequency AC power system, and the network reactive power and voltage integrated control is used to achieve real-time automatic completion capacitor To improve power factor, reduce line loss and improve power supply quality.
SGB type is used for 10kV lines, mainly composed of AC vacuum contactor, fully sealed high-voltage parallel connection container , HV controller, wireless current transformer (or outdoor pole mounted current transformer), voltage transformer, lightning arrester, connection bus, etc. The current signal is measured by outdoor pole mounted current transformer or wireless current transformer, and the V type voltage transformer is connected to vacuum switch Previously, it was used to measure the voltage of bus and calculate reactive power through voltage and current. Use wireless transmission and reception of current signals or outdoor current CT to high-voltage reactive power controller as current sampling.
Automatic switching principle: measurement Power Supply Side bus voltage and current, calculate reactive power Q1 of the network, and set according to reactive power and capacitor door Automatic switching is carried out by phase comparison. When Q1 is greater than the switching threshold Qt, the device is put into operation after a set delay; When Q1 is greater than the cut-off threshold Qq, (the capacitor is put into the capacity of overcompensation, and the power factor should be negative at this time) after the set delay, the device will exit the operation.
According to the actual operating parameters of the bus, properly change the set values of Qt and Qq to obtain better economic benefits and ensure that the device will not have switching oscillation.
Discharge resistance is installed in the device capacitor.
2. Service conditions
Altitude: ≤ 1500m
Ambient temperature category: - 40/A, - 25/B 45 ℃ (indoor) 60 ℃ (outdoor)
Relative humidity: 20%~90% at 40 ℃ (or 45 ℃)
The installation site shall be free of harmful gas and steam, and conductive dust.
The installation site shall be free from violent vibration and impact.
3. Main parameters
·The rated voltage is 10kV and 6kV.
·Rated capacity of column mounted reactive compensation device (kvar): 100, 200, 300, 360, 450, 600, 900, 1200.
·Working voltage in control cabinet: ～ 220V ± 20%.
·Control mode: voltage, reactive power, time period.
·Measurement accuracy: voltage error ≤ 0.5%, current error ≤ 1%, reactive and active error ≤ 1%, power factor ± 2%.
·It has overcurrent, overvoltage, undervoltage and phase failure protection functions. After the compensation device is disconnected from the power grid, the residual voltage will be automatically reduced to below 50V through internal discharge components.
·The device adopts a vertical box structure, and the cabinet body can be made of high-quality steel plate or stainless steel plate. It can be installed on the mounting frame of two vertical cement poles higher than three meters, with the protection grade of IP3L3.
