Description
Overview of IEC 61850 Transformer Protection Relay
- As a supplement to transformer main and backup protection, the digital main transformer integrated monitoring and control device realizes remote measuring, remote signaling, remote control and remote regulation. It is generally panel-mounted with transformer differential relay protection and other transformer protection relays.
- These IEC 61850 compliant protection relays for transformer cover full transformer protection and control demands.
On-load Tap Changer Function
- These transformer protection devices cooperate with on-load tap changer controller to perform tap regulation. Automatic, manual and remote control modes are supported. No voltage drop at minimum tap and no voltage rise at maximum tap. Single-step tap change limited by preset delay, output resets automatically after timeout.
Outline and Installation Dimensions
Power Transformer Protection Devices Setting List
| No. | Display Name | Range | Step | Remarks |
|---|---|---|---|---|
| 1 | Tap Setting | |||
| 1.1 | Automatic Tap Regulation | 1/0 | 1: Enable, 0: Disable | |
| 1.2 | Manual Tap Regulation | 1/0 | 1: Enable, 0: Disable | |
| 1.3 | Remote Tap Regulation | 1/0 | 1: Enable, 0: Disable | |
| 1.4 | Tap Position Display via YX1-7 | 1/0 | 1: Show tap position, 0: Common remote signal input | |
| 1.5 | Tap Transceiver Connection | 1/0 | 1: BCD code display, 0: 7-gear corresponding display | |
| 1.6 | Maximum Tap Position | 1～32 | 1 | |
| 1.7 | Boost Delay | 0～120.00s | 0.01s | |
| 1.8 | Buck Delay | 0～120.00s | 0.01s | |
| 1.9 | Boost Setting Value | 50～120.00V | 0.01V | |
| 1.10 | Buck Setting Value | 50～120.00V | 0.01V | |
| 2 | Measurement Setting | |||
| 2.1 | 380V Measurement | 1/0 | 1: On, 0: Off | |
| 2.2 | 1A Corresponding Current | 1/0 | 1: On, 0: Off | |
| 2.3 | Non-electrical Quantity | 1/0 | 1: With non-electrical quantity, 0: Without non-electrical quantity |
FAQ
Q：How to protect a transformer？
A:Electrical protection of transformer shall be configured according to capacity and operating environment, adopting customized schemes for different units.
Q：How to size overcurrent protection for a transformer？
A:As key relay for transformer protection, over current protection of transformer sets operating current to evade maximum load current and inrush current. Rated current adopts 1.1~1.2 times for load avoidance and 5~12 times for instantaneous trip against inrush current. Delay time matches subordinate protection to guarantee selectivity.
Q：Protective measures applied to 132 kV main transformer protection
A:
| No. | Protection Type | Core Function Description |
|---|---|---|
| 1 | Differential Transformer Protection | Rapidly isolate inter-phase and turn-to-turn short circuit faults of transformer windings |
| 2 | Transformer Overcurrent Protection | Phase and zero-sequence overcurrent serves as reliable backup protection for differential protection |
| 3 | Transformer Earth Fault Protection | Defend against earth short circuit accidents of the transformer |
| 4 | Transformer Overload Protection | Monitor overheating risk of the transformer and trigger alarm alerts |
| 5 | Comprehensive Electrical Transformer Protection | Covers voltage, frequency abnormal protection and lightning defense functions |
| 6 | Transformer Non-electrical Protection | Safeguards gas, oil temperature, pressure and cooling system operating status |
| 7 | On-load Tap Changer Interlock Protection | Avoids equipment damage caused by improper operation of the tap changer |
Q：IEEE guide for transformer protection
A:Core Orientation of the Guide
Q：What is restricted earth fault protection of transformer
A:This protection is mainly applied to internal earth faults of transformer windings. It offers high sensitivity against earth faults near the neutral point and serves as a dedicated earth fault solution for large power transformers. This function is fully supported by IEC 61850 Transformer Protection Relay.
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