HYZ- Series Complete DC power supply system overview
1.1 Product Use
HYZ series DC power supply devices produced by our company are widely used in power coal, iron and steel smelting, petrochemical and municipal buildings and other fields, providing stable and reliable DC power supply for high-low voltage circuit breakers and secondary equipment in power substation and distribution room of factories and mining enterprises.
1.2 Implementation of standards and procedures

• DL5000-94 “Thermal Power Plant design Technical Regulations”;
• IEC896-2-1995 “Valve controlled lead-acid maintenance-free Battery”;
• ZBK45017-90 “General Technical Conditions for DC screens for Power Systems”;
• GB50172-92 “Electrical device installation regulations Battery construction acceptance Code”;
• DL/ T5004-95 “Technical Regulations on DC System Design for Thermal Power Plants and substations”
  1.3 Model Description

1.4 System composition and main functional features
It mainly consists of AC power distribution, monitoring module, rectifier module, microcomputer insulation monitoring, battery inspection, buck silicon chain, flash alarm, DC feed and so on. It can also be flexibly combined according to the specific requirements of users.

Dc power supply system basic block diagram

• Two AC input, automatic switching, high reliability;
• Rectifier module parallel operation, N+1 hot backup mode, any single module damage does not affect the system operation;
• The monitoring module adopts all Chinese LCD display. The monitoring module exits due to a fault. The rectifier module works normally.
• Microcomputer insulation monitoring can monitor the DC system insulation in real time, and can automatically find the branch ground, with the help of the caliper receiver, you can determine the specific ground point without power failure.
• Integrated substation automation system can be realized through RS485 communication interface, and can be connected to the DCS system of the power plant. To realize the functions of “telemetry, remote control, remote communication and remote adjustment” of DC power system, and meet the requirements of unattended.
  1.5 Main Technical specifications
• AC input voltage: AC 380V±15%, 50HZ, three-phase four-wire system, two power inputs (single-phase AC 220V power supply).
• DC output voltage: DC220V, DC110V;
• Output current: Control bus (KM) 5~120A;
• Battery capacity: valve-controlled sealed lead-acid maintenance-free battery 20Ah~3000Ah;
• Stability accuracy: ≤±0.5%;
• Steady flow accuracy: ≤±0.5%;
• Ripple coefficient: ≤±0.5%;
• System efficiency: ≥92%;
• Power factor: ≥0.99;
• Running noise: ≤50dB;
• Dielectric strength: 2000V/min no flashover, no breakdown;
• Insulation impedance: > 10MΩ;
• Protection class: IP30;
• Dimensions: 2260(H)×800 (W)× 600 (D) (mm);
  2360(H)×800 (W)× 600 (D) (mm); Or according to user requirements.
  1.6 Operating Environment Conditions
• Installation location: indoor installation (can also be installed in the box);
• Relative humidity: ≤50% at +40℃, higher relative humidity is allowed at low temperature;
• Altitude: installation altitude ≤3000 meters;
• Seismic intensity < 8°, installation vertical inclination < 5°;
• Pollution level ≤3, no conductive particles in the environment;
• The installation site should be free from explosion danger and serious mold, no corrosive metal and destroy insulation gas;
• The installation site should have good air flow and heat dissipation conditions.

1. Describes the functions of the main unit
   Module unit function description: monitoring module, charging rectifier module, WZJ-1 microcomputer DC insulation monitoring system, WMX microcomputer maintenance-free battery detector, buck silicon chain loop, DC converter, inverter, valve-controlled sealed lead-acid maintenance-free battery.
2. Typical scheme design
   3.1 Overview
   Battery capacity and service life are two important indicators of battery selection, battery selection should pay attention to the performance difference between different manufacturers, generally imported batteries have high reliability and long service life (up to 18 years), but the price is more expensive. Users can make a reasonable selection according to the importance of the project and the cost performance. Because the current circuit breaker opening current and normal load current is small, the capacity of battery and rectifier module is greatly reduced than the previous selection, and the use of buck silicon chain is also greatly reduced. Because the rectifier module has N+1 backup, two separate sets of rectifier modules are rarely used to reduce investment. For 6KV, 10KV small and medium-sized systems generally do not consider installing flash devices. Therefore, our company fully considered the above factors in the selection design.
   The following are recommended several commonly used typical design schemes for users and design institutes to select a reference.

3.2 Scheme Design
The solution design is detailed in technical support HYZ series DC power system.pdf

4. Product packaging, transportation, storage instructions
   4.1 Packaging, transportation and storage of products

• Packaging: The screen cabinet of the complete set of devices is packed in wooden cases, and meets the requirements of relevant standards, and the battery is packaged separately.
• Transportation: The equipment shall not be inverted during transportation to prevent rain and strong vibration of collision. Batteries should be packed separately and do not touch terminals or safety valves. Batteries are delivered with liquid charge, and short circuit should be prevented during transportation.
• Storage: The equipment should be stored indoors, the storage place should be dry, clean, air circulation, no corrosive and flammable gases in the surrounding air, the air temperature can be -25 ° C to +55 ° C, the average monthly relative humidity is not greater than 90%, it is strictly prohibited to store with corrosive items in the same place. The battery to be stored for a long time should be properly charged and the surface of the battery should be cleaned, and the pole, nut, metal washer, and jumper plate should be evenly coated with petroleum jelly, and stored in a ventilated, dry room at 25±10 ° C. It should be fully charged again every six months.
  4.2 Ordering Instructions
• Can be selected according to the typical design specifications, just provide the following basic parameters can be:
• Equipment model, specification, quantity, delivery date;
• Screen cabinet color, appearance size and structure form;
• Required spare parts and specifications quantity;
• Feed out loop name, number, capacity, etc.;
• Any other special technical requirements and instructions;
• If there is any discrepancy with the final design, please provide:
• DC system schematic and panel layout (reference)
• Provide loop number, name, code, capacity and other parameters;
• Product operation, use and system rated voltage;
• According to the requirements for non-standard and special requirements, special purpose products design and production, the two sides negotiate and sign an agreement.