In short. A generator only protects a site if it is correctly connected to everything around it. Integrated power covers that connection: how the load transfers from mains to generator (ATS or AMF), how several sets synchronise and share load, the LV and MV switchgear and transformers between source and load, protection and earthing, monitoring, and the redundancy level (N+1 or 2N) the site needs. Most generator failures in service are failures of this integration, not of the engine.
Where to start
| If your question is… | Start with |
|---|---|
| The generator must start and take load automatically on mains failure | AMF Panels |
| Choosing an automatic transfer switch type | Automatic Transfer Switches |
| Running two or more generators together | Generator Paralleling |
| Sharing load correctly between paralleled sets | Generator Load Sharing |
| Deciding how much redundancy the site needs | N+1 Power Architecture |
| Planning the whole system from first principles | Integrated Power System Design Guide |
All 22 guides in this section
- ATS — Automatic transfer switch guidance: selection, transfer logic, coordination and testing.
- Automatic Transfer Switches — How an automatic transfer switch moves load between mains and generator, how to specify poles, rating and transition type, and what to check before you buy.
- AMF Panels — What an AMF panel monitors, how its start, transfer, retransfer and cooldown logic should be set for Indian mains conditions, and where automatic standby fails.
- Generator-to-Generator Transfer — How to arrange two diesel generators as duty and standby without paralleling, what triggers the changeover, how duty rotation works and how to interlock them.
- Generator-Grid Paralleling — What changes when a diesel generator runs in parallel with the DISCOM grid, which protection it needs, how kW and kVAr are controlled, and how approval works.
- Generator Paralleling — How several diesel generators are synchronised onto a common bus, what controls and protection the plant needs, and when paralleling gives real redundancy.
- Generator Load Sharing — How paralleled generators divide real and reactive load, the difference between droop and isochronous sharing, what poor sharing looks like and how to test it.
- Load Management — How load management protects a generator by deciding what connects, in what order and what is shed, with a priority method, shedding triggers and restoration.
- Synchronising Panels — What a DG synchronising panel contains, how it handles dead-bus start, synchronising, load sharing and alarms, and how to specify, commission or retrofit one.
- Master Controls for Multi-Generator Plants — What a generator plant master controller decides above the unit controllers, how it sequences sets and holds reserve, and how to design its fallback.
- LV Generator Switchgear — How to specify 415 V generator switchgear: continuous current, fault withstand, breaker type, form of separation, ventilation and maintainability.
- MV Generator Switchgear — When generator plants should move to medium voltage, what 11 kV generator switchgear contains, which studies it needs and how operating safety changes.
- PCC & MCC Integration — How a diesel generator connects into a plant PCC and MCC: incomer position, interlocks, motor restart order, APFC on generator supply and fault duty.
- Transformer Integration — What happens when a generator energises or feeds through a transformer: inrush, voltage dip, vector group, impedance, protection and paralleling checks.
- Cables, Busbars & Distribution — How to size and route generator cables and busbars: current, derating for Indian ambient, voltage drop with a worked example, terminations and temporary runs.
- Protection Coordination for Integrated Power Systems — How protection is graded in a generator-fed system so a fault removes only its own zone: decaying fault current, time grading and dual source settings.
- Earthing & Neutral Architecture — How generator neutral earthing, body earthing and ATS neutral switching fit together so earth faults are cleared safely, with guidance for paralleled sets.
- SCADA, BMS & DCIM Integration — Which generator data a SCADA, BMS or DCIM should receive, over which protocols, how monitoring differs from control, and what must happen when the link fails.
- Utility Paralleling — What it takes to run a generator in parallel with the DISCOM supply: operating modes, interface protection, export limits, islanding decisions and approvals.
- N+1 Power Architecture — How to design a genuine N+1 generator plant: defining N from load and transients, removing shared dependencies, derating, maintenance states and…
- N+N & 2N Power Architecture — What 2N and N+N mean for generator and distribution design: independent A and B paths, the shared elements that break them, and when the cost is justified.
- Integrated Power System Design Guide — A fourteen-step method for designing an integrated generator power system, from load classification through transfer, protection, earthing and commissioning.
Questions engineers ask
What is the difference between an ATS and an AMF panel?
An ATS is the switch that moves the load between mains and generator. An AMF panel adds the logic that senses the mains failure, starts the generator, transfers the load and returns it when mains is restored. Many sites use an AMF panel that controls an ATS or a pair of interlocked breakers.
When do generators need to be paralleled?
When one set cannot carry the load, when the site needs N+1 redundancy, or when load varies widely and running fewer sets at light load saves fuel. Paralleling needs synchronising controls, load sharing and protection designed together.
Engineering content reviewed by Srinivas Reddy, Managing Partner, Reddy Generators. For advice on your own site, send us your requirement or call 098852 01608.