SmartGen HPD300 Reverse Power Protection Relay

1. Overview

The HPD300 reverse power protection relay is widely utilized in marine genset and land genset applications. It is designed to prevent situations where power flows backward to the generator from the system, which can occur when the generator loses excitation or experiences other failures, effectively turning the generator into an electric motor. The HPD300 provides protection against such over-power situations.

2. Performance and Characteristics

• Suitable for 3-phase 4-wire, 3-phase 3-wire, single-phase 2-wire, and 2-phase 3-wire systems with frequencies of 50/60/400Hz.
• Collects 3-phase voltage, 3-phase current, frequency, and power parameters.
• Parameters monitored include: Generator (GEN) voltage (Uab, Ubc, Uca), frequency (Hz), and Load (LOAD) current (IA, IB, IC), and Active Power (kW).
• Features adjustable potentiometers for setting values and delay times.
• Provides 2 relay outputs.
• Includes one test button for testing reverse power, over current, and indicators.
• Wide power supply range: DC(8~35)V, compatible with various starting battery voltage environments.
• 35mm guide rail mounting.
• Modular design with pluggable terminals for easy installation.

3. Technical Parameters

4. Panel Button Description

The HPD300 features a panel with various indicators, buttons, and terminals:

• DC24V Terminals (1, 2): For DC power input. Terminal 1 is for negative (-) and Terminal 2 is for positive (+).
• LINK Terminal (17): Used for parameters setting.
• RP TRIP RELAY Terminals (3, 4, 5): Relay output for reverse power trip. Terminal 3 is Normally Closed, Terminal 4 is COM, Terminal 5 is Normally Open.
• OC TRIP RELAY Terminals (6, 7, 8): Relay output for over current trip. Terminal 6 is Normally Closed, Terminal 7 is COM, Terminal 8 is Normally Open.
• Phase Voltage Input Terminals (9, 10, 11): L1, L2, L3 for phase voltage input.
• CT Input Terminals (12, 13, 14, 15, 16): IL1, IL2, IL3 for connecting to the secondary coil of current transformers.
• Indicators: POWER (green), RP TRIP (red), OC TRIP (red).
• Buttons/Potentiometers: TEST button, LEVEL/% Reverse Power Set Value Potentiometer, DELAY /s Potentiometer, OVER/% Over Current Set Value Potentiometer, DELAY /s Potentiometer.

Figure 1 - Panel Drawing depicts the layout of these components.

Table 4 - Description of Terminal Connection provides details on each terminal's function and connection:

5. Function Description

6. Scopes and Definitions of Programmable Parameters

PC Program: Parameters setting and real-time monitoring can be implemented via the LINK port by using PC software and an SG72 adapter produced by SmartGen.

Figure 2 - PC Program Connection illustrates the connection setup for PC programming.

7. Typical Diagram

Figure 3 - 3 phase 3 wire/3 phase 4 wire shows the typical wiring diagram for 3-phase systems.

Figure 4 - Single phase 2 wire/2 phase 3 wire shows the typical wiring diagram for single-phase and 2-phase systems.

8. Installation Dimensions

Figure 5 - Case Dimensions and Cutout provides the physical dimensions of the HPD300 unit.

1) Output And Expand Relays

All outputs are relay contact output type. To expand relays, add a freewheel diode to both ends of the relay's coils (for DC current) or a resistance-capacitance return circuit (for AC current) to prevent disturbance to the controller or other equipment.

2) AC Input

Current input must be connected to an external current transformer. The current transformer's secondary side current must be 5A. Ensure the phases of the current transformer and input voltage are correct; otherwise, the current and active power readings may be inaccurate.

Note: When there is load current, the transformer's secondary side must not be open-circuited.

3) Withstand Voltage Test

CAUTION! If a high voltage test is required when the relay is installed in a control panel, disconnect all terminal connections of the relay to prevent high voltage from entering the relay and causing damage.