STS366T digital ground transformer protection device is a complete set of current and voltage protection function products, suitable for 66KV and below voltage levels of ground transformer or used as station ground transformer. It provides quick break protection, single-stage overcurrent protection, high-voltage side single zero-sequence current protection, low-voltage side single zero-sequence current protection, single zero-sequence voltage protection, non-electrical quantity protection of transformer, and completes measurement and control functions. It can be installed locally in the switch cabinet or assembled on the control panel.
The STS 366T is a digital ground‑transformer protection and control device designed for voltage levels up to 66 kV. It provides fast‑trip, zero‑sequence over‑voltage, over‑current, and non‑electrical protections for both high‑ and low‑voltage sides, and can be installed in switchgear cabinets or control rooms.
The manual describes the device’s protection logic, configuration parameters, soft‑panel functions, and data‑recording capabilities. It includes tables of setting values, control‑word definitions, and wiring diagrams to aid installation, operation, and maintenance. This manual is written in Chinese.
| Rated DC voltage | 220 V or 110 V |
|---|---|
| Rated AC voltage per phase | 100 V |
| Rated AC current | up to 14 A |
| Rated frequency | 50 Hz |
| Normal power consumption | ≤ 15 W |
| Power consumption during operation | ≤ 25 W |
| Sampling voltage range | 0.4 V – 120 V |
| Sampling current range | 0.08 A – 20 A |
| Contact rating | 400 V · A |
| Data recording capacity | up to 50 reports, ≥ 1000 events |
The device can be supplied with either 220 V or 110 V DC.
It provides five protection output contacts.
Yes, it records fault waveforms after a protection action and stores them in FLASH RAM, with up to 50 reports and at least 1000 events.
Normal power consumption does not exceed 15 W.