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Protection-Relay Series — Grid-Code Protection
1 Models available · Monitoring, Protection & SCADA
Protection relays implement the under/over-voltage, under/over-frequency and islanding protection required for safe grid connection.
Model Number Breakdown
- Voltage/frequency protection
- Islanding detection
- Configurable trip settings
- Utility grid-code support
Specifications Range
All specifications and dimensions can be customized upon request
| Key parameters | Model Range |
|---|---|
| Interface | RS485, Ethernet |
| Uplink Protocol | Modbus, IEC 61850 |
| Device Capacity | 1 |
| Communication | Ethernet, optical fiber ring |
| Monitoring | Real-time monitoring, Alarm |
⚙How It Works
A protection relay is the safety gatekeeper for grid connection. It continuously monitors voltage and frequency and trips the plant off-grid the instant a parameter leaves its configured window — under/over-voltage, under/over-frequency, or an islanding condition. Utilities require a certified relay before any generator, including a PV plant, may connect to their network.
▦Structure & Composition
The relay samples the grid voltage and frequency through instrument transformers, compares them against configurable trip settings, and drives a trip output to the main breaker. It includes an islanding detection algorithm and a local display for setting and status, with Modbus communication for remote supervision of the trip state.
Model Range
| Model | Interface | Uplink Protocol | Device Capacity | Communication | Monitoring | Reference Price |
|---|---|---|---|---|---|---|
| QD-EMS-REL | RS485, Ethernet | Modbus, IEC 61850 | 1 devices | Ethernet, optical fiber ring | Real-time monitoring, Alarm | … |
Applications
Selection Guide
- Required for every grid-connected plant — choose a relay certified for the target utility's grid code.
- Configure the voltage and frequency trip windows to the utility's interconnection requirements.
- Integrate the trip output with the main breaker so a fault isolates the plant immediately.
Frequently Asked Questions
Why is a protection relay mandatory?
Utilities require certified under/over-voltage, under/over-frequency and islanding protection before a plant may connect to the grid.
What is islanding protection?
The relay detects when the plant is unintentionally energising a dead grid section and trips to prevent back-feeding.
Can the trip settings be adjusted?
Yes — the voltage and frequency windows are configurable to match the utility's grid code.
Instant Selection & Quote Calculator
Select your specifications to get an estimated price instantly.
| Base price (interpolation) | $1,215 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Complete equipment — no winding copper linkage
Reference prices are for estimation only and do not constitute a formal offer.
We will reply with your latest quote instantly.
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