S Series Power Frequency Substation UPS

S Series Power Frequency Single Phase Grid Indoor UPS (3kVA & 5kVA)

Product Positioning

      Rack-mounted power frequency UPS developed for power grid indoor scenarios, mainly installed in substation communication cabinets, distribution automation control cabinets and power station secondary control rooms.

Complete Model Classification

3kVA Series

DC110V standalone/parallel: S103BD

DC220V standalone/parallel: S103AD

5kVA Series

DC110V standalone/parallel: S105BD

DC220V standalone/parallel: S105AD

Core Structure Feature

      Standard cabinet mounting structure, two panel opening dimensions for flexible cabinet matching, hot-swappable power unit design for fast on-site maintenance.

1. Product Overview

      Different from large-capacity SDL heavy-duty floor-standing UPS, this power frequency substation UPS targets compact rack installation for secondary power control cabinets. It strictly adopts mature power frequency UPS topology, supports dual input of commercial AC and station DC power (110V/220V), outputs stable 50Hz pure sine wave power for protection of relay protection devices, communication transmission equipment and RTU terminals.

      This power frequency substation UPS supports up to 6 units parallel operation with current sharing imbalance controlled within ±5%, meeting the step-by-step capacity expansion demand of grid reconstruction projects. Built-in output isolation transformer suppresses harmonic interference and ground surge current, DSP full digital control realizes soft start to eliminate inrush current when powering on. The unit reserves RS232/RS485 Modbus communication and dry contact interfaces, which can be connected to the substation centralized monitoring platform to realize remote three-remote management. The whole machine meets DL/T 1074-2019 power industry testing standards and is highly adapted to long-term unattended operation of indoor power stations.

2. Core Advantages

2.1 Stable Power Frequency Architecture Optimized for Grid Scenarios

      Wide input voltage and frequency tolerance reduces battery charge-discharge cycles to extend battery service life. The built-in isolation transformer effectively suppresses harmonic impact on inverters, and the strong overload & short-circuit resistance ensures stable operation under harsh grid fluctuation. Intelligent temperature-controlled fan design lowers dust accumulation risk for long-term reliable operation of this power frequency substation UPS.

2.2 Flexible Parallel Expansion & Hot-swap Maintenance

      No master-slave parallel design, maximum 6 units connected in parallel; power module supports hot swap, faulty unit can be pulled out and replaced quickly without shutting down the whole system, minimizing grid business downtime. Customizable soft start parameter, transfer time between mains and backup path is controlled below 4ms.

2.3 Complete Industrial-grade Monitoring & Protection

      Equipped with LCD display + indicator light for local operation check; RS485 Modbus protocol + 6 dry contacts realize remote data upload and fault linkage alarm. Full protection covers input/output over/under voltage, over temperature and short circuit to avoid equipment damage caused by abnormal grid status.

2.4 Harsh Environment Adaptability

   ● Operating temperature range: -10℃ ~ +45℃, storage temperature from -20℃ to +60℃

   ● Humidity adaption meets long-term indoor power station environment

   ● Normal operation up to 3000m altitude, linear derating rule for high-altitude sites

   ● Low leakage current design, suitable for densely arranged secondary cabinet groups

3. Global Typical Application Scenarios

     1.Backup power for communication transmission equipment of urban and rural substations

     2.Power supply protection for distribution automation RTU, FTU and remote terminal units

     3.Secondary control cabinet load backup for small hydropower and thermal power stations

     4.Power industry indoor monitoring cabinet, relay protection device UPS power supply

     5.EPC power renovation project, compact rack-type standby power solution

4. Full Model Parameter Comparison Table

4.1 Universal Electrical Specifications

Machine Overall Index

   ● Max parallel number: 6 units, current sharing imbalance ≤±5%

   ● Max Power: 4200VA(0.9PF)/4667VA | 7000VA(0.9PF)/7777VA

   ● Input PF ≥0.95, total leakage current ≤3.5mA

   ● Dry contact expandable: half group 3DI+3DO, full group 6DI+6DO

   ● Monitoring: LCD + indicator, RS485 Modbus, 6 dry contacts, three-remote function

AC Input

   ● Voltage: AC220V(-20%~+20%)

   ● Frequency: 50Hz±10%

   ● THD ≤10%, single harmonic current ratio ≤30%

DC Input

   ● Voltage: DC110V/220V (DC 170V~270V working range)

   ● DC bus reverse ripple ≤±1.5% rated DC voltage

   ● Starting inrush current ≤150% rated current

AC Output

   ● Voltage: AC220V adjustable ±1%

   ● Frequency: 50Hz adjustable ±0.2Hz

   ● Dynamic voltage deviation ≤±5%, recovery time ≤10ms

   ● Sync precision ≤2%

   ● Wave distortion: linear load ≤2%, nonlinear load ≤5%

Bypass

   ● Bypass input: AC220V

   ● Transfer time ＜4ms

Protection & Alarm

   ● Over/under voltage protection for AC input, DC input, inverter output and bypass circuit

   ● Overload logic: 120% continuous operation; 125% load for 10min; 150% load for 1min; ＞150% transfer to bypass immediately

   ● Alarm trigger for AC/DC/bypass abnormality, inverter undervoltage and other faults

Environment

   ● Operating temp: -10℃~+45℃; storage temp: -20℃~+60℃

   ● Humidity: daily avg ≤95%, monthly avg ≤90% @40℃ non-condensing

   ● Altitude: full load up to 3000m, derate 1% output per 100m extra elevation

5. Optional Supporting Accessories for Overseas Projects

     1.Custom panel adapter plates for different overseas standard cabinets

     2.Substation centralized UPS monitoring software platform

     3.Extended dry-contact alarm terminal box

     4.Hot-swappable backup power modules

6. Operator FAQ

Q1: Can this UPS work with both 110VDC and 220VDC substation battery systems?

A1:We provide dedicated models for DC110V and DC220V two mainstream substation DC voltage specifications for selection.

Q2: How many units can be paralleled for capacity expansion?

A2: Maximum 6 units parallel operation, current sharing imbalance kept within ±5%.

Q3: Does it support hot-swap maintenance?

A3: The power unit adopts hot-plug design, which can be replaced quickly without shutting down the whole UPS system.

Q4: Can it connect with substation SCADA monitoring system?

A4: Standard RS485 Modbus RTU interface and dry contacts support docking with mainstream power automation SCADA platforms.

Q5: Is the product certified for global power EPC bidding?

A5: The design strictly complies with DL/T 1074-2019 power industry standard, and can provide full test reports for tender documents.

7. Document Download & After-sales Policy

Downloadable Files

   ● S Series 3kVA/5kVA Grid Indoor UPS English Datasheet

   ● Cabinet Opening Dimension Drawing & Wiring Manual

   ● Industry Standard Compliance Test Reports

Global Warranty

   ● 3-year warranty for mainframe

   ● Remote technical support for overseas project commissioning

   ● OEM labeling and parameter customization available for EPC partners