The DC system is mainly composed of two major parts. One part is the other part of the battery screen is a DC charging screen (DC screen). The battery screen is a cabinet (800 ¡Á 600 ¡Á 2260) that can be placed in multiple battery. The battery in the battery screen is typically composed of 2V-12V batteries in series, and the corresponding electrical output is 110V or 220V. The battery currently used is primarily a valve-free sealed maintenance lead-acid battery. The DC screen is mainly by cabinet, rectifier module system, monitoring system, insulation monitoring unit, battery inspection unit, switching amount detection unit, buck unit, and a series of communication units, DC output, voltage display, current display and other distribution units. .1. Rectifier module system: The power rectification module is a single-machine module that flows in direct current, usually nominally by current size (such as 2A module, 5a module, 10a module, 20a module, etc.), according to the design concept It can also be divided into: air cooling module, independent air duct module, self-cooling module, self-energy air cooling module, and self-refining module. It can be used in parallel to achieve N1 redundancy. The module output is 110V, 220V stable and adjustable DC voltage. The module itself has a relatively complete protection function such as: input overpressure protection, output overvoltage protection, output limit protection, and output short circuit protection.
2, monitoring system: The monitoring system is the control of the entire DC system, the management core, its main task is to perform long-term automatic monitoring of each function unit and battery in the system, acquire various operational parameters and status in the system, according to the measurement data and Timely handling in operation, and use this as a basis for controlling the system, fully automatic management of power systems, ensuring continuity, reliability, and security of its work. The monitoring system is currently divided into two: one is that there is a touch screen type. : Monitoring system provides human-machine interface *, implement system operation parameter display, system control operation, and system parameter settings.
3, the insulation monitoring unit: DC system insulation monitoring unit is a device that monitors the insulation of DC system, which can monitor line-ground drain resistors in real time, and this value can be set according to the specific situation. When the line is designed to the setting value, an alarm signal will be issued. The DC system insulation monitoring unit currently has bus insulation monitoring, support insulation monitoring.
4. Battery Patrol Unit: The battery inspection unit is an apparatus for patrolling the line voltage of the battery. You can detect how much each battery voltage is detected in real time. When the battery voltage is over or low, the alarm signal will be issued, and the battery can be displayed by the monitoring system to fail. Battery inspection units typically detect 2V-12V batteries and patrols to detect 1-108 batteries.
5, switch quantity detection unit: The switching amount detecting unit is an apparatus for detecting the amount of switch to the switch and the alarm dry node output. For example, when the circuit breaker is faulty in the entire system, it is a warning signal, and the switching amount detecting unit will issue an alarm signal, and can display a fail-free trip or which way to display the circuit breaker through the monitoring system. Melt. The current switch detection unit can be acquired to 1-108 road switch and multiple passive dry node alarm output.
6, the buck unit: The buck unit is a buck regulator device. It is a combined mechanical input buck unit, and the buck unit is then output to the control mother, and the controller voltage is adjusted (110V or 220V). When the anematic voltage changes, the buck unit is automatically adjusted to ensure that the output voltage is stable. The buck unit is also nominally nominally in the size of the output current. There are two types of step-down units, one is a conventional antihypertensive silicon chain, one is a stepless buck chopper. The level buck silicon chain has 5-level buck and seven-stage buck. The voltage regulatory point is 3.5V, which means that the step-down silicon chain automatically regulates the stabilized controlled mother voltage when the combined electrical voltage is raised or decreased by 3.5V. The stepless buck chopper is a buck module that is smaller than the buck silicon chain. It does not have a voltage regulatory point, and the output voltage is also stable than the step-down silicon chain. There is also overpressure, overcurrent, and battery over-discharge. Waiting for functions. However, there is currently not very mature failure, so it is still a wide range of step-down silicon chains.
7, power distribution unit: The power distribution unit is mainly used in the DC screen to implement AC input, DC output, voltage display, current display, etc., such as power cord, terminal block, AC circuit breaker, DC circuit breaker, contact Lightning, splitter, fuse, conversion switch, button switch, indicator, and current, voltage meter, etc.
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