WDD-3X series microcomputer protection device installation dimensions
Dimensions: 80mm (H) ×160mm (W) ×130mm (D)
1、 Application scope
WDD-3X has the characteristics of strong universality and wide application, and can be applied to the main or backup protection of various electrical equipment and lines in non directly grounded power grids with voltage levels of 35kV and below. Usually, using only one model of WDD-3X product can meet the protection and automation functions required by substations, reducing maintenance workload and spare parts.
The WDD-30 universal operating unit is a circuit breaker operating actuator with anti trip function and opening/closing indication. Used in conjunction with WDD-31, WDD-33, and WDD-34. When the circuit breaker itself has an anti trip operation circuit, it can be optionally selected.
Scope of application:
※ Incoming line protection and control
※ Outgoing line protection and control
※ Protection and control of factory transformers
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
Note 1: WDD-31 zero sequence current protection has two stages of zero sequence protection on the high and low voltage sides.
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
2、 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
