Description
Overview of Integrated Transformer Protection Devices
- 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.
- Please note that this product is suitable for two-turn transformer protection but is not suitable for three-turn transformer protection.
Technical Features of Transformer Secondary Protection
- 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.
Function Configuration of transformer electrical protection
- Differential Protection ANSI 87T
- 2nd & 3rd Harmonic Restraint
- Differential Instantaneous Protection ANSI 87
- Differential Current Overlimit Alarm
- TA Broken Circuit Detection
- Three-stage Compound Voltage Overcurrent Protection (with harmonic restraint) ANSI 51V
- Inverse-time Overcurrent Protection (with harmonic restraint) ANSI 51
- Two-stage Definite-time Negative Sequence Overcurrent Protection ANSI 46
- HV Side Definite-time Zero-sequence Overcurrent Protection (with harmonic restraint) ANSI 51N
- LV Side Definite-time Zero-sequence Overcurrent Protection (with harmonic restraint) ANSI 51N
- LV Side Inverse-time Zero-sequence Overcurrent Protection ANSI 51N
- Overload Protection ANSI 49
- Overvoltage Protection ANSI 59
- Undervoltage Protection ANSI 27
- Non-electrical Quantity Protection
- F-C Interlock
- Sampling: Current, Voltage, Active Power, Reactive Power, Power Factor, Active Energy, Reactive Energy, 15-channel Switch Quantity Acquisition
- 4-20mA Analog Output (Optional, please specify when ordering)
- IRIG-B & NTP Time Synchronization
Setting List
| 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 |
Outline and Installation Dimensions
FAQ
Q：Advantages and disadvantages of transformer differential and backup protection?
A:According to industry regulations, transformer differential protection devices are designed to protect against internal transformer faults, while transformer backup protection covers external transformer faults.
When combined, this approach can effectively reduce costs in practical applications, but it may not necessarily meet the actual acceptance criteria.
The advantage is cost savings, but the disadvantage is that if the unit malfunctions, the transformer has no relays to protect it. Furthermore, it may not meet on-site technical specifications.
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