WDD-3X series microcomputer protection device installation dimensions
Dimensions: 80mm (H) ×160mm (W) ×130mm (D)
- Application scope
WDD-3X has the characteristics of strong versatility and wide application range, and can be applied to the main protection or backup protection of various electrical equipment and lines in the non-directly grounded power grid with voltage levels of 35kV and below. Usually, WDD-3X can meet the protection and automation functions required by the substation, reducing the maintenance workload and spare parts.
WDD-30 universal operating unit is circuit breaker operating actuator, with anti-jump function and opening and closing indication. It can be used with WDD-31, WDD-33 and WDD-34. Optional when the circuit breaker itself has an anti-jump operating circuit.
Scope of application:
※ In-line protection and control
※ Outlet protection and control
※ Factory transformer protection and control
※ High voltage motor protection and control
※ High voltage capacitor protection and control
※ Voltage transformer switching function
Two, WDD-3X microcomputer protection device main functions
2.1 Protection Function
| product Protection function | WDD-31 | WDD-32 | WDD-33 | WDD-34 |
| Current velocity break protection | ● | – | ● | ● |
| Time limit current current break protection | ● | – | ● | ● |
| Overload protection | ● | – | ● | – |
| Afteracceleration protection | ● | – | – | – |
| Zero sequence current protection | ●(Note 1) | – | ● | – |
| Overvoltage protection | – | – | ● | ● |
| Low voltage protection | – | – | ● | ● |
| Reclosing protection | ● | – | – | – |
| Non-electrical protection | ● | ● | ● | |
| Overheat protection | – | – | ● | – |
| Long startup time protection | – | – | ● | |
| PT parallel/uncolumn | ● |
2.2 Data Protection:
※ Protection current (IA, IB, IC)
※ Zero sequence current (3I0)
2.3 Monitoring Function
2.3.1 Support 8 external switch inputs, and can directly act on tripping or alarm; Hardware circuit filtering and software time window technology are used to eliminate the remote signal error caused by switch node jitter and electromagnetic interference, and the accuracy of remote signal can reach 100%.
2.3.2 Monitoring contents include:
※ Circuit breaker position
※ Ground knife position
※ Isolation knife position (fixed cabinet)
※ Working position of the handcart (handcart cabinet)
※ Spring energy storage state, gas pressure state (GIS cabinet)
※ Other contact signals, such as temperature, gas, interlock signals, etc
※ Device self-test
WDD-3X terminal diagram
Typical wiring diagram of WDD-3X
3.1 Typical wiring diagram for line protection
3.2 Typical transformer protection wiring diagram
3.3 Typical wiring diagram of high voltage motor protection
3.4 Typical wiring diagram of high voltage capacitor protection
3.5 Typical wiring diagram of the operation unit
3.6 Typical wiring diagram of voltage transformer switching device
