This manual describes the features, protection functions, wiring, and configuration procedures for the Julong WCK-7021/7022/7023 capacitor protection and…
The WCK-7021/7022/7023 series is a capacitor protection and monitoring device designed for neutral‑grounded or arc‑suppressor grounded systems up to 35 kV. It provides two‑stage over‑current protection, zero‑sequence grounding protection, over‑voltage, low‑voltage, and additional functions such as imbalance voltage/current, bridge‑difference current, and differential voltage protection depending on the model.
The unit uses a modular, distributed architecture with a 32‑bit MCU, CAN or RS‑485 communication, and a large LCD panel for real‑time display of voltage, current, power, frequency, and alarms. Settings are adjusted via the built‑in menu, and the device supports remote telemetry, signaling, and control. This manual is written in Chinese.
| Input voltage | DC220V ±20% or AC220V ±20% |
|---|---|
| Number of input channels | 22 |
| Number of output channels | 1 (trip/close control) |
| Communication interface | CAN or RS‑485 |
| Power consumption | <10 W |
| Dimensions (H×W×D) | 177 mm × 263 mm × 237 mm |
| Operating temperature range | –25 °C to +70 °C |
The device can operate at 125 kbps or 38.4 kbps on CAN bus, and similar rates on RS‑485.