What is an automatic voltage regulator and its specifications
AVR (automatic voltage regulator) is a sealed electronic device that regulates the output power of the rectifier of the exciter armature by controlling the magnetic field of the low power exciter, so as to meet the requirements of controlling the magnetic field current of the main machine and stabilizing the output voltage of the brushless generator. It has low frequency and no input signal protection device. It is also equipped with parallel compensation function to meet customers' demand for capacity expansion.
It has the functions of voltage setting, stability adjustment, F/V frequency/voltage characteristic setting, F/V low frequency protection, F/V voltage drop setting, excitation current limit, parallel positive cross adjustment (droop adjustment), and can be controlled by external voltage trimming potentiometer and power factor regulator.
Taking SY-AVR-2058 as an example, its general specifications are as follows:
Maximum output 4A 95VDC
Voltage regulation rate ≤ 0.5%
Generator field resistance 15 ohms minimum ± 8% with external potentiometer 1K Ω 1/2W potentiometer
Voltage establishment (initial stage) When the remanence voltage is greater than 5V25Hz, the voltage will be established automatically
Low-frequency protection Built-in protection circuit with output voltage decreasing when engine speed decreases
Operating temperature: - 40 ℃~60 ℃
Function of terminal block:
1.K1 and K2 are magnetic field switches, which must be short-circuited and bridged when not in use.
2.P2 and P3: input terminals of magnetic field power supply.
3.2 and 3: detection power input terminals.
4.1 and 2: They are external VR, and must be short-circuited and bridged when not in use.
5.X, XX: X is magnetic field F+, XX is magnetic field F -.
6.S1 and S2: Droop (speed drop), CT input terminal.
7. J1~J8: select jumper 2-3, 4-5, 6-7.
