S Series Off-Grid Substation Indoor Frequency UPS

S Series Off-Grid Substation Indoor Frequency UPS (3kVA ~ 10kVA)

Product Positioning

      Rack-mounted frequency UPS designed for independent secondary cabinets inside substation buildings (indoor cabinet equipment, not applicable for open-air outdoor environments). Distinct from indoor built-in cabinet S series UPS.

Full Corrected Standard Model List

● 3kVA

DC110V Standalone/Parallel: S103BD-E

DC220V Standalone/Parallel: S103AD-E

● 5kVA

DC110V Standalone/Parallel: S105BD-E

DC220V Standalone/Parallel: S105AD-E

● 8kVA

DC110V Standalone/Parallel: S108BD-E

DC220V Standalone/Parallel: S108AD-E

● 10kVA

DC110V Standalone/Parallel: S110BD-E

DC220V Standalone/Parallel: S110AD-E

Core Design

      Standard rack installation structure, two sets of panel opening sizes to match different station cabinets; power modules support hot swap for fast on-site maintenance without shutdown.

1. Product Introduction

      Different from built-in cabinet UPS installed inside integrated control cabinets, this off-grid substation indoor frequency UPS is dedicated to independent secondary power cabinets placed separately inside substation main buildings, all equipment works in indoor environment and cannot be deployed in open-air outdoor scenes.

      The unit adopts classic industrial frequency UPS topology, supports AC220 mains and DC110/220 station dual power input, outputs stable 50Hz pure sine wave power for relay protection, RTU and communication devices in independent secondary cabinets. It supports up to 6 units parallel with current sharing imbalance ≤±5%, modular hot-swap design greatly reduces maintenance downtime during station overhaul. Built-in output isolation transformer suppresses harmonic and surge interference caused indoor unstable grid; full DSP digital soft start eliminates switch-on inrush current. Equipped with RS485 Modbus communication and 6 groups of dry contacts to realize remote three-remote management, fully compliant with DL/T 1074-2019 power industry standards.

2. Core Product Advantages

2.1 Optimized Design for Independent Indoor Substation Cabinets

      Wide voltage and frequency input window reduces battery charge-discharge cycles to extend service life; built-in isolation transformer eliminates harmonic impact on inverters, with strong overload and short-circuit resistance to cope with complex indoor grid fluctuation inside substations. Intelligent temperature-controlled fan reduces dust accumulation inside closed cabinets and improves long-term reliability of this off-grid substation indoor frequency UPS.

2.2 Masterless Parallel & Hot-Swap Maintenance

      No master-slave parallel control, maximum 6 units capacity expansion; independent power module hot swap design allows replacement without whole machine shutdown. Customizable soft-start parameters, transfer time between mains and backup path controlled below 4ms to guarantee uninterrupted power for secondary control loads.

2.3 Complete Protection & Full Remote Monitoring

      Local LCD + indicator lights for on-site inspection; RS485 Modbus protocol plus expandable dry contacts connect to substation SCADA platform for real-time data upload and fault linkage alarm. Full over/under voltage, over temperature and short-circuit protection prevents equipment damage caused by abnormal indoor power supply.

2.4 Strict Power Industry Standard Compliance

      All electrical indexes meet DL/T 1074-2019 standard, low leakage current design, stable operation under wide indoor temperature and humidity conditions, clear output derating rules for high-altitude station rooms.

3. Global Typical Application Scenarios

     1.Independent secondary distribution cabinets inside urban and rural substation main buildings

     2.Separate power supply cabinet for remote terminal RTU of power distribution automation

     3.Small hydropower, thermal power station independent communication control cabinet load backup

     4.Indoor secondary equipment power supply of power grid transformation EPC projects

     5.Unattended station indoor independent monitoring cabinet standby power system

4. Full Model Parameter Table

4.1 Universal Electrical Parameters

Overall Machine Index

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

   ● Peak Power(PF=0.9): 3kVA=4200VA/4667VA；5kVA=7000VA/7777VA；8kVA=9600VA/10667VA；10kVA=12000VA/13333VA

   ● Input power factor ≥0.95, total leakage current ≤3.5mA

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

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

AC Input

Voltage: AC220V(-20%~+20%)；Frequency:50Hz±10%；Voltage THD≤10%；Single harmonic current ratio≤30%

DC Input

Voltage: DC110V/DC220V (working range 170V~270V)；DC bus reverse ripple ≤±1.5% rated DC voltage；starting inrush current ≤150% rated current

AC Output

Output voltage AC220V adjustable ±1%；Frequency 50Hz adjustable ±0.2Hz；dynamic voltage deviation ≤±5%；recovery time ≤10ms；sync precision ≤2%；THD linear load≤2%, nonlinear load≤5%

Bypass

Bypass input AC220V；transfer time＜4ms

Protection & Alarm

AC/DC input、inverter output、bypass over/under voltage protection; overload rule:120% continuous operation,125% lasts 10min,150% lasts 1min,＞150% transfers to bypass immediately; alarm for AC/DC/bypass anomaly and inverter faults

Environment

Operating temp:-10℃~+45℃；Storage temp:-20℃~+60℃；humidity daily avg≤95%, monthly avg≤90% non-condensing @40℃；full load altitude up to 3000m, derate 1% output per 100m elevation

5. Optional Overseas Project Accessories

     1.Cabinet adapter plates matching international standard station secondary cabinets

     2.Centralized UPS monitoring platform for substation room

     3.Extended dry-contact alarm terminal box

     4.Hot-swappable spare power modules

6. Operator FAQ

Q1 What does off-grid substation indoor UPS mean? Is it suitable for open-air outdoor use?

A1: Off-grid substation indoor UPS refers to power supply equipment for independent secondary cabinets inside substation buildings, all installation environments are indoor, strictly cannot be used in open-air outdoor scenes. We provide DC110V (BD suffix) / DC220V (AD suffix) dedicated models for each capacity.

Q2 How many units can be connected in parallel for capacity expansion?

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

Q3 Does the power module support hot-swap maintenance without machine shutdown?

A3: Yes, independent power unit hot swap design, faulty module can be replaced directly without cutting off the whole UPS system power.

Q4 Can it be connected to substation SCADA automation platform?

A4: Standard RS485 Modbus RTU interface and dry contacts support docking with mainstream power monitoring systems.

Q5 Can it be used for overseas power station EPC bidding projects?

A5: The product complies with DL/T 1074-2019 standard, complete test reports can be provided for tender documents.

7. Document Download & After-sales Policy

Download Files

   ● S Series Off-Grid Substation Indoor UPS English Datasheet

   ● Cabinet Opening Drawing & Installation Wiring Manual

   ● Full Industry Standard Compliance Test Reports

Global Warranty

   ● 3-year warranty for mainframe

   ● Remote technical guidance for overseas project commissioning

   ● OEM labeling and parameter customization for EPC partners