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Integrated Transformer Protection Device
Integrated Transformer Protection Devices feature transformer differential and backup protection, applicable to substation integrated automation systems and new energy power plant electrical automation systems. They support cabinet centralized installation and switchgear direct mounting for decentralized control.
ANSI codes: 87T,87,51V,51,46,51N,49,59,27
Communication Mode
Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103), IEC 61850
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Description
The integrated transformer protection device combines transformer differential protection, backup overcurrent protection, voltage protection, earth fault protection, measurement, communication and fault recording in one intelligent protection relay. It is designed for two-winding power transformers in substations, industrial power systems and renewable energy applications.
Protection Functions
| Function | ANSI Code |
|---|---|
| Transformer Differential Protection | 87T |
| Instantaneous Differential Protection | 87 |
| Voltage-Restrained Overcurrent | 51V |
| Overcurrent Protection | 51 |
| Negative Sequence Overcurrent | 46 |
| Zero-Sequence Overcurrent | 51N |
| Thermal Overload Protection | 49 |
| Overvoltage Protection | 59 |
| Undervoltage Protection | 27 |
What Is an Integrated Transformer Protection Device?
An integrated transformer protection device is a microprocessor-based protection relay that combines multiple transformer protection functions into a single device. Instead of using separate relays for differential, overcurrent, earth fault, voltage and overload protection, an integrated relay combines these functions with measurement, communication and fault recording.
| Conventional Protection | Integrated Protection Device |
|---|---|
| Multiple protection relays | One multifunction relay |
| More wiring | Simplified wiring |
| Separate measurements | Unified measurement |
| Multiple communication interfaces | Integrated communication |
| Separate fault records | Centralized fault recording |
| Larger panel space | Compact installation |
| More configuration points | Centralized configuration |
Technical Features of the Integrated Transformer Protection Device
- Measures three-phase current, zero-sequence current (Ia, Ib, Ic, Io), three-phase and line voltage (Uan, Ubn, Ucn, Uab, Ubc, Uca), active power P, reactive power Q, power factor cosφ, frequency f, active energy kWh and reactive energy kVarh.
- Measurements cover fundamental wave as well as 2nd to 13th harmonics. Adaptive frequency range: 45~60Hz, ensuring consistent readings with professional meters.
- Equipped with one 4~20mA DC analog output, configurable for current, voltage or power to replace AC acquisition transmitters.
- Up to 15 user-definable binary input channels.
- Trip matrix configurable for protection output relays. Contacts can be set as auto-reset trip contacts or manual-reset signal contacts.
- Built-in operating circuit adapts to 0.5A~5A breaker tripping and closing current, compatible with AC and DC power supply.
- Supports network timing, IRIG-B timing via RS485 port and SNTP timing.
- Differential protection adopts anti-saturation criteria to avoid mal-operation caused by TA saturation during equipment startup and external faults.
- Reliable TV broken line detection prevents false tripping of undervoltage protection.
- Dual 100M Ethernet ports and one RS485 port, compliant with IEC60870-5-103, Modbus-TCP protocols.
- Stores 16 fault records with maximum 13 analog channels sampled at 1ms interval, recorded in standard Comtrade format.
- Low static power consumption around 6W. Optimized LCD design extends service life significantly.
Protection Functions
- 87T Differential Protection
- 87 Differential Instantaneous Protection
- 51V Voltage-Restrained Overcurrent
- 51 Overcurrent Protection
- 46 Negative Sequence Protection
- 51N Zero Sequence / Earth Fault Protection
- 49 Thermal Overload Protection
- 59 Overvoltage Protection
- 27 Undervoltage Protection
Measurement and Monitoring
- Three-phase current
- Zero-sequence current
- Phase and line voltage
- Active power
- Reactive power
- Power factor
- Frequency
- Active energy
- Reactive energy
- Harmonic measurement
Communication and SCADA Integration
The integrated transformer protection relay supports multiple communication interfaces and protocols for integration with substation automation and SCADA systems.
| Communication | Application |
|---|---|
| IEC 61850 | Substation automation |
| IEC 60870-5-103 | Protection communication |
| Modbus TCP | SCADA / industrial automation |
| RS-485 | Local communication |
| Ethernet | Network communication |
Setting List of Transformer Protection Devices
| No. | Setting Name | Unit | Range | Remark |
|---|---|---|---|---|
| 1 | Transformer Rated Current | A | 0.05～30.00 | |
| 2 | Differential Protection Setting | Ie | 0.2～2.00 | |
| 3 | Differential Instantaneous Trip Setting | Ie | 1.00～20.00 | |
| 4 | Percentage Differential Restraint Coefficient | — | 0.3～1 | |
| 5 | 2nd Harmonic Restraint Coefficient | — | 0.1～0.3 | |
| 6 | 3rd Harmonic Restraint Coefficient | — | 0.1～0.3 | |
| 7 | Low Voltage Side Balance Coefficient | — | 0.1～10 | |
| 8 | Differential Current Alarm Threshold | Ie | 0.1～1 | |
| 9 | Differential Current Alarm Time | s | 0.1～50 | |
| 10 | 1st Stage Overcurrent Setting | A | 0.05～99.99 | |
| 11 | 1st Stage Overcurrent Time Delay | s | 0～60 | |
| 12 | 2nd Stage Overcurrent Setting | A | 0.05～99.99 | |
| 13 | 2nd Stage Overcurrent Time Delay | s | 0～60 | |
| 14 | 3rd Stage Overcurrent Setting | A | 0.05～99.99 | |
| 15 | 3rd Stage Overcurrent Time Delay | s | 0～60 | |
| 16 | 2nd Harmonic Restraint Coefficient | — | 0.1～0.3 | |
| 17 | Undervoltage Startup for 1st Stage Overcurrent | V | 10~90 | Set by line voltage |
| 18 | Undervoltage Startup for 2nd Stage Overcurrent | V | 10~90 | Set by line voltage |
| 19 | Undervoltage Startup for 3rd Stage Overcurrent | V | 10~90 | Set by line voltage |
| 20 | Negative Sequence Voltage Startup Overcurrent | V | 1～99.99 | Set by line voltage |
| 21 | Inverse-time Overcurrent Startup Value | A | 0.05～99.99 | Ip |
| 22 | Inverse-time Overcurrent Time Constant | s | 0～60 | tp |
| 23 | 1st Stage Negative Sequence Overcurrent Setting | A | 0.05～99.99 | |
| 24 | 1st Stage Negative Sequence Overcurrent Time Delay | s | 0～60 | |
| 25 | 2nd Stage Negative Sequence Overcurrent Setting | A | 0.05～99.99 | |
| 26 | 2nd Stage Negative Sequence Overcurrent Time Delay | s | 0～60 | |
| 27 | 1st Stage HV Zero-sequence Overcurrent Setting | A | 0.05～30 | |
| 28 | 1st Stage HV Zero-sequence Overcurrent Time Delay | s | 0～60 | |
| 29 | 2nd Stage HV Zero-sequence Overcurrent Setting | A | 0.05～30 | |
| 30 | 2nd Stage HV Zero-sequence Overcurrent Time Delay | s | 0～60 | |
| 31 | LV Zero-sequence Overcurrent Setting | A | 0.05～99.99 | |
| 32 | LV Zero-sequence Overcurrent Time Delay | s | 0～60 | |
| 33 | Inverse-time Zero-sequence Rated Current | A | 0.05～99.99 | |
| 34 | Inverse-time Zero-sequence Time Constant | s | 0～60 | tp |
| 35 | Inverse-time Zero-sequence Threshold | Ie | 0～20 | Ire |
| 36 | Overload Setting | A | 0.05～99.99 | |
| 37 | Overload Time Delay | s | 0～60 | |
| 38 | Overvoltage Setting | V | 15～140 | |
| 39 | Overvoltage Time Delay | s | 0.1～60 | |
| 40 | Undervoltage Setting | V | 15～99.99 | |
| 41 | Undervoltage Time Delay | s | 0.1～60 | |
| 42 | FC Interlock Current Setting | A | 0.1～99.99 | |
| 43 | FC Interlock Time Delay | s | 0～60 |
Applications of Integrated Transformer Protection Devices
Substation Protection
-
MV/HV substations, distribution substations, industrial substations
Renewable Energy
-
Solar power plants, wind power plants, PV booster substations
Industrial Power Systems
-
Manufacturing plants, mining, oil & gas, large industrial facilities
Retrofit Projects
-
Especially suitable for replacing multiple conventional protection relays with a single multifunction numerical protection relay – saving space, simplifying wiring, and reducing overall costs. This is particularly valuable for overseas engineering contractors.
Why Choose Our Integrated Transformer Protection Device?
Multiple Protection Functions in One Relay
Combines differential, overcurrent, earth fault, voltage and overload protection.
Simplified Panel Design
Reduces wiring, panel space and the number of individual protection devices.
Flexible Communication
Supports IEC 61850, IEC 60870-5-103, Modbus and Ethernet communication.
Fault Recording
Stores fault records and sampled data for troubleshooting and system analysis.
Flexible Installation
Suitable for centralized cabinet installation or direct switchgear mounting.
Technical Support
Configuration, relay settings, communication integration and application support are available for project requirements.
Outline and Installation Dimensions
FAQ
Is this integrated transformer protection device suitable for two-winding transformers?
Yes. This model is designed primarily for two-winding transformer protection. For three-winding transformer applications, please contact our technical team to confirm the appropriate protection model.
What protection functions are integrated into the device?
The relay integrates transformer differential protection (87T), instantaneous differential protection (87), voltage-restrained overcurrent protection (51V), overcurrent protection (51), negative sequence protection (46), zero-sequence protection (51N), overload protection (49), overvoltage protection (59) and undervoltage protection (27).
What is the advantage of an integrated transformer protection relay?
It combines multiple protection, measurement, communication and fault-recording functions in one device, helping reduce panel space, wiring complexity and commissioning workload.
Does the relay support IEC 61850?
Yes. The device supports IEC 61850 as well as other communication interfaces and protocols depending on the configuration.
Can the relay be integrated with a SCADA system?
Yes. The communication interfaces support integration with substation automation and SCADA systems.
Does the device support transformer differential protection?
Yes. Transformer differential protection is provided through ANSI 87T, with differential restraint and harmonic restraint functions designed to improve protection security during transformer energization and external faults.
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High Quality
Stable performance, reliable design, ensuring safe operation for power system protection and grid stability.
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Best Warranty
Professional Warranty: Reliable after-sales support for stable relay protection and long-term customer satisfaction.
xiao zhang –
This integrated transformer protection device combines differential main protection and backup protection with stable braking logic, effectively resisting inrush current and avoiding false tripping. It covers short-circuit, overload and earth fault protection, quickly isolating transformer faults to safeguard substation equipment safety.
Jack –
Dual power supply option adds extra reliability — great feature.