Deskripsi
Transformer Sampling Board Electrostatic Precipitator
The transformer sampling board (also known as the sampling board / detection board) on the electrostatic precipitator has the core function of collecting the operating parameters of the high-voltage silicon rectifier transformer, providing a basis for monitoring, adjustment and protection of the control system, and serving as a “data bridge” between the transformer and the main control system of the electrostatic precipitator.
Its specific functions can be divided into the following three points:
1. Accurately collect core operating parameters
The core power source of an electrostatic precipitator is a high-voltage silicon rectifier transformer, which is responsible for converting the industrial frequency AC power into tens of thousands of volts of DC high voltage to supply the electric field to generate corona discharge to adsorb dust.
The core function of the sampling board is to collect two sets of key parameters:
a. Output DC high voltage signal: The DC high voltage value of the secondary side of the transformer is collected through a voltage divider circuit and converted into a low voltage analog signal (such as 0-10V , 4-20mA ) that can be recognized by the main control system.
b. Output DC current signal: The operating current output by the transformer is collected through a current transformer or shunt to reflect the magnitude of the corona current in the electric field.
2. Provides adjustment basis for the control system to ensure dust removal efficiency.
The main control system will determine the electric field conditions in real time based on the voltage and current data fed back by the sampling board.
a. If the voltage is too low or the current is too small, it may be due to excessive dust accumulation in the electric field or abnormal electrode spacing. The system will automatically increase the output voltage to maintain the optimal corona discharge intensity.
b. If the voltage drops suddenly or the current increases suddenly, it may be due to a flashover or short circuit in the electric field. The system will immediately reduce the voltage or trip to avoid ineffective discharge.
Simply put, the data from the sampling plate is the direct basis for the system to “judge the operating conditions and optimize parameters,” and directly affects the dust removal efficiency of the electrostatic precipitator.
3. Achieve fault monitoring and safety protection
The parameters collected by the sampling board are compared with preset safety thresholds. If the values exceed the thresholds, a protection mechanism will be triggered.
a. When overvoltage / overcurrent is detected, a rapid feedback is sent to the protection circuit to cut off the transformer power supply and prevent the transformer from burning out due to overload;
b. When no-load / under-current is detected , it indicates faults such as poor electric field insulation or electrode breakage, which facilitates timely troubleshooting by maintenance personnel and prevents the fault from escalating.
Additional explanation: The accuracy of the sampling plate directly affects the response speed of the control system. Therefore, it is usually paired with filtering and voltage regulation circuits to reduce the impact of power grid fluctuations or electric field interference on the sampling data and ensure the accuracy of monitoring and control.
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