ZMK ⅡSeries distributed DC power supplyShanghai Renren Automation Technology Co., Ltd. The new generation of distributed power generation, developed based on the original distributed power source in 2015. Compared to the distributed power sources currently in use on the market, this model offers a new solution for the reliability, economy, and automation of power system supply, excelling in quality, features, power, and size.

ZMK ⅡThe Series Distributed DC Power Supply is a new type of DC power supply equipment, primarily used in small switch stations and user ends. It provides a reliable uninterrupted power supply for secondary control circuits (such as intelligent terminals like microcomputer protection and indicator lights, analog indicators, etc.), preventing the loss of protection function of microcomputer protection during AC power failure. It also addresses issues caused by overvoltage and harmonics that lead to the failure of UPS and subsequently the failure of microcomputer protection. Additionally, it can supply DC operating power to primary switching equipment that meets power requirements (such as spring mechanism vacuum circuit breakers, permanent magnet mechanism vacuum circuit breakers, and motorized load switches, etc.).

ZMK ⅡThe series of distributed DC power supplies feature both AC input and PT input options, with output specifications ranging from DC220V to DC24V. They cater to various application scenarios. The maximum output power of the unit reaches 600W, meeting the demands of different loads.

ZMK ⅡThe series of distributed DC power supplies are compact, easy to install and wire, suitable for installation within various switchgear models. They offer greater reliability and economy (more pronounced for small-scale end-users) compared to conventional DC screen systems, while also saving space, reducing line losses, and minimizing installation work. Additionally, they are easy to maintain, providing a new choice for power system supply reliability.

ZMK ⅡSeries distributed DC power supplies utilize high-frequency power technology. The batteries are maintained with an automatic charging management module, significantly extending their service life, ensuring safer and more reliable operation of the device. The unit features communication and alarm functions, allowing for convenient remote automated management without the need for on-site attendance.

2. Application Scope

ZMK ⅡSeries distributed DC power supplies are primarily used within various types of switchgear, providing a reliable DC operating power source for main switches (circuit breakers, load switches, etc.) and secondary protection devices.

    Description:

Input Voltage Range: 85VAC ~ 265VAC

Direct Current Output Voltage Ranges: 220V, 110V, 48V, 24V

4. Technical Specifications

  4.1 Environmental Conditions

Operating environment temperature: -10℃ to 45℃

Maximum Monthly Average Relative Humidity: ≤90%

Maximum Daily Average Relative Humidity: ≤95%

Altitude: Not exceeding 2,000 meters

Work Environment Conditions: No conductive dust particles, no corrosive substances that damage metals or insulation, location of use

The facility should be capable of withstanding rain, snow, wind, and sand, and the surrounding area must not be filled with steam or have a severe mold presence.

4.2 Input Power

（1）AC Input Voltage: 85～265V

（2）Frequency: 50Hz ± 10%

（3）Waveform: Sine wave, waveform distortion < 5%

（4）Power requirement: Not less than 250VA per unit

4.3 Output Power and Power Consumption

  Continuous Operating Power

Continuous Operation: ≤200W

Meets the power requirements for microcomputer protection devices, indicator lights, and analog indicators; when powered by batteries, it can last up to 8-24 hours depending on the battery capacity and load parameters.

② Impulse operating power: ≤700W, 60S

Suits most 10KV system circuit breakers for solenoid operators, including VS1, VD4, ZN21, etc., and meets the energy storage power requirements for electric load switches.

③ Instantaneous Operating Power: ≤1000W, 300ms

Meets the power supply needs of most 10KV system circuit breakers and load switches for operation mechanisms, such as VS1, VD4, ZN21, etc.; can operate over 20 times when powered by battery backup.

   (2) Power Consumption：The device itself consumes no more than 8W of power.

 4.4 Battery Charging and Discharging

The unit is externally powered by 2x12V batteries. In the event of an AC power outage, it ensures continuous DC power supply. The specific backup time is determined by the battery capacity and load size. When the battery voltage drops too low or rises too high, the unit emits an alarm signal and automatically stops the DC output to protect the battery. When AC power is restored, the unit automatically resumes DC power supply and can fully recharge the batteries within 72 hours.

4.5 Communication Speed and Protocols

（1）Communication Rate: 9600 bps

（2）The specification employs the MODBUS communication protocol.

4.6 Compliant Standards

Insulation properties meet the standards of GB/T14598.3-93.

(2) Voltage sag adaptation capability meets the requirements of GB/T17626.11-1999.

(3) Electromagnetic Compatibility Performance:

The insensitivity to static discharge complies with GB/T15153.1-1998, Grade 3 requirements.

The insensitivity to interference from power-frequency magnetic fields meets the 3rd grade requirements of GB/T15153.1-1998.

The insensitivity to rapid transient pulse group interference complies with GB/T17626.4-1998, Grade 3 requirements.

The insensitivity to high-frequency interference complies with DL/T721-2000 specifications.

The surge interference insensitivity conforms to the regulations of DL/T721-2000.

5. Product Features

  (1) Dispersed installation; saves land area and reduces construction cost

Based on the distributed design philosophy,ZMK ⅡSeries of distributed DC power supply units are directly installed in the instrument cabinet of an intelligent switchgear (or the electric operation box of an outdoor unit), which can save the floor space of the DC screen.

Due to the power source being located within the switchgear, it reduces the cable usage, saving on initial equipment investment and cable installation labor; with a low total count, its total price is lower than the DC screen system, thus lowering the overall project cost; simultaneously, during operation, it reduces line loss and spare parts, saving on operational costs.

(2) Distributed power supply method, reliability greatly enhanced

The supply is distributed, so when one circuit malfunctions, the power units in other circuits are unaffected, preventing the entire station from losing operational power due to a single fault. Compared to a centralized power supply DC screen, its overall reliability is significantly enhanced.

This product boasts high automation, requiring minimal specialized knowledge from the operator during routine operations. Operation can be performed by following the instructions in this user manual.

Second Usage Environment

2.1 Altitude not exceeding2000Rice.

2.2 Environmental Temperature-10～＋50℃ 。

2.3 Average relative humidity not greater than95%, monthly average relative humidity not greater than90％。

2.4 Free from strong vibration and impact, and free from strong electromagnetic field interference.

2.5 No serious dust, explosive hazardous medium, corrosive metals, harmful gases that destroy insulation, conductive particles, or severe mold is present in the vicinity.

2.6 Vertical Inclination Not Greater Than5Degree.

III. Technical Specifications

3.1 Three-phase AC input voltage380V（ 15%，-10%)，Frequency50 HZ±0.5。

3.2 Control Busbar Direct Current Output Voltage:220V /24V/48V/110V

3.3 Rated Direct Current Output Current of Bus Bar40A。

3.4 The rated capacity of the maintenance-free fully sealed lead-acid battery is applicable to:40AH-500AHCase Study:120AH）。

3.5 Bus Voltage Stability: ≤±0.2%。

3.6 Control bus voltage ripple factor ≤ ±0.1%。

3.7 Current Accuracy ≤ ±0.5%。

3.8 Disconnecting bus voltage ≤15%，10%。

3.9 Maximum Output Current Limit(A)：1.2IN。

3.10 Efficiency ≥90%。

3.11 Power Factor >0.90。

3.12 Response Speed:0.2ms。

3.13 Total Noise ≤50dB。

3.14 Flow Distribution Method: Automatic Flow Distribution.

3.15 Harmonic: No Interference.

3.16 Input Terminal High Voltage Surge: Grade 4 Lightning Protection

Direct Current Screen Charging Module Fault Code