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Leon Zhang sales consultant
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Email: zxl635973785@gmail.com
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Phone/WhatsApp: +86 13655813266
400V Low Voltage Generator Protection Relay
Low Voltage Generator Protection Relay delivers complete generator fault protection for 400V standby generator units. Equipped with negative sequence, 59N grounding, reverse power and loss-of-excitation protection, compatible with industrial SCADA systems for remote monitoring and fault data logging.
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Description
- Our low voltage generator protection relay is a high-performance microcomputer-based protection and monitoring unit specially developed for 400V low-voltage synchronous generators, diesel generators, gas generators and small hydropower generator sets.
- Integrating professional electrical protection, real-time data measurement, signal acquisition and intelligent communication functions in one compact device, it solves common fault risks of low-voltage generators in industrial power stations, commercial backup power systems and distributed power generation projects.
Protection Configuration
| Protection Item | Function Description | Operation Mode |
|---|---|---|
| Instantaneous Overcurrent | – | Trip |
| Time-delayed Instantaneous Overcurrent | With undervoltage blocking | Trip |
| Overcurrent | – | Trip |
| Inverse Time Overcurrent | Normal / Very Inverse / Extremely Inverse characteristic curves optional | Trip |
| Overload | Alarm or trip configurable | Alarm / Trip selectable |
| Zero-sequence Overcurrent | Self-produced zero-sequence current function optional | Alarm / Trip selectable |
| Overvoltage | – | Trip |
| Undervoltage | Current-blocked undervoltage protection optional | Alarm / Trip selectable |
| Overfrequency | – | Trip |
| Underfrequency | – | Trip |
| Reverse Power | – | Trip |
| CT Broken Circuit | – | Alarm |
| PT Broken Circuit | Undervoltage protection blocked upon PT failure | Alarm |
| Control Circuit Breakage | – | Alarm |
Product Advantages
Industrial-Grade Stability
Adopts anti-interference industrial hardware design with a wide operating voltage range. It runs reliably under high temperature, high humidity and strong electromagnetic interference conditions, ideal for long-term unattended operation of generator sets.
High Precision & Low Measurement Error
Features Class 0.2 electrical measurement accuracy, guaranteeing precise monitoring of generator operating parameters and dependable protection tripping actions.
Easy Installation & Commissioning
Compact all-in-one structure for panel mounting. It supports flexible parameter configuration and programmable logic setup without complicated secondary development work.
Diversified Communication Protocols
Comes with Ethernet and standard communication ports, supporting mainstream protocols including Modbus RTU. Compatible with all types of industrial SCADA monitoring systems to enable remote real-time monitoring and data transmission.
Cost-Effective Integrated Design
Combines protection, measurement, monitoring and control into a single unit, replacing multiple single-function modules. It cuts down overall equipment procurement costs and field wiring expenses.
Low Voltage Generator Protection Relay setting
| No. | Menu Item (Setting Name) | Setting Range | Default Value | Remarks |
|---|---|---|---|---|
| 1 | PT Primary Rated Voltage | 0.1~999.99KV | 10KV | – |
| 2 | PT Secondary Rated Voltage | 100~999V | 100V | – |
| 3 | Measuring CT Primary Rated Current | 1~9999A | 600A | – |
| 4 | Measuring CT Secondary Rated Current | 1~5A | 5A | 5A or 1A |
| 5 | Protection CT Primary Rated Current | 1~9999A | 600A | – |
| 6 | Protection CT Secondary Rated Current | 1~5A | 5A | 5A or 1A |
| 7 | Zero Sequence CT Secondary Rated Current | 1~5A | 5A | 5A or 1A |
| 8 | Reserved | – | – | – |
| 9 | Number of PTs | 2~3 | 3 | – |
| 10 | Number of Measuring CTs | 2~3 | 3 | – |
| 11 | Zero Sequence Voltage Self-generation | 0~1 | 0 | 0: External; 1: Self-generated |
| 12 | Zero Sequence Current Self-generation | 0~1 | 0 | 0: External; 1: Self-generated |
| 13 | Protection Ia Polarity Reversal | 0~1 | 0 | Default |
| 14 | Protection Ib Polarity Reversal | 0~1 | 0 | Default |
| 15 | Protection Ic Polarity Reversal | 0~1 | 0 | Default |
| 16 | I0 Polarity Reversal | 0~1 | 0 | Default |
| 17 | Measuring IA Polarity Reversal | 0~1 | 0 | Default |
| 18 | Measuring IB Polarity Reversal | 0~1 | 0 | Default |
| 19 | Measuring IC Polarity Reversal | 0~1 | 0 | Default |
| 20~24 | Reserved | – | – |
Generator protective relay single line diagram
Application Scenarios
This low voltage generator protection device is widely compatible with all types of 400V low voltage generator sets, serving industrial and commercial projects worldwide:
- Backup diesel generator sets for industrial factories
- Low voltage power generation equipment of small and medium hydropower stations
- Standby power supply systems for commercial buildings, hospitals and data centers
- Distributed power generation and off-grid power supply projects
- Marine and mobile low voltage generator units
FAQ
Q1: What is the function of a low voltage generator protection device?
A low voltage generator protection device is the core safety component for 400V generator sets. It monitors generator operating parameters in real time. In case of faults such as overcurrent, overload, overvoltage, undervoltage and reverse power, it will automatically trigger alarms or tripping operations to protect the generator and power grid from damage and guarantee stable power supply.
Q2: What protection functions does a low voltage generator protection relay provide?
It features full protection functions including overcurrent, overload, negative sequence current, zero sequence current, over/undervoltage, over/under frequency, reverse power and loss-of-excitation protection. It also supports PT fault detection, event recording and real-time parameter monitoring to deliver all-round protection for low voltage generators.
Q3: Is this generator protection device compatible with diesel generators?
Yes. This intelligent protection unit is specially designed for low voltage diesel generators, gas generators and small hydro generators, perfectly matching the operating parameters and fault characteristics of industrial standby generator sets.
Q4: Does the generator protection relay support remote monitoring?
Absolutely. Equipped with standard communication ports and compatible with mainstream industrial protocols, the device can connect to SCADA and remote monitoring systems for real-time data viewing, remote parameter configuration and remote fault inquiry.
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High Quality
Stable performance, reliable design, ensuring safe operation for power system protection and grid stability.
Fast Delivery
Timely delivery to support your urgent orders and project schedules efficiently and professionally at any time.
Best Warranty
Professional Warranty: Reliable after-sales support for stable relay protection and long-term customer satisfaction.
Jack –
The product is fully functional and particularly suitable for small hydropower projects.