DEIF PPM Power Management System Operation and Troubleshooting

Alarm and Event Management

1. Alarm list operation

When any protection function is triggered, the display unit will automatically jump to the alarm list. If you need to actively view, you can press the "INFO" key to enter directly. Each record in the alarm list contains:

Unacknowledged (UN ACK) or Confirmed (ACK) status

Total number of alarms and current serial number

Use the up and down keys to flip through pages, or select "FIRST"/"Last" to quickly locate

Once the alarm condition disappears and is confirmed, the record will be removed from the active alarm list but permanently stored in the event log (Log List).

2. Event log (Log List)

The log list can store up to 150 historical events, covering system power on, protection actions, circuit breaker opening and closing, parameter modification, etc. Press the "LOG" key to enter, and also support jumping by first/last event. This feature is crucial for post fault analysis - it is recommended that operators export log archives at least once a week.

3. Alarm processing logic

Typical alarm parameters include: Set point, Timer, Relay A/B, Enable, and Fail class. The fault level is divided into 8 levels (F1~F8), commonly mapped as: F1=Warning, F3=Block, F4=Trip CB, F6=Shutdown, etc. The specific meaning needs to refer to the Design Manual (DRH).

Power station mode management of AOP-2 operation panel

AOP-2 is a key component for implementing multi electromechanical station automation in PPM systems. Its 8 buttons and 16 LEDs support the following power station modes:

SEMI-AUTO (semi-automatic): The controller automatically performs synchronization, closing, and load distribution, but the start/stop of the unit needs to be manually initiated by the operator.

AUTO (fully automatic): Automatically start and stop the diesel engine according to the load of the busbar, achieving true "unmanned operation".

SHAFT (shaft generator mode): When the shaft generator supplies power to the busbar, PMS automatically limits the diesel engine start to avoid long-term parallel operation.

SHORE (shore power mode): When connected to shore power, PMS automatically disconnects the diesel engine and manages load transfer.

SPLIT (Split Busbar Mode): The busbar circuit breaker is disconnected, and both sides of the busbar operate independently, with each side managing its own connected unit.

In addition, the SECURED ON button can force an additional standby diesel engine to start (usually used to reserve margin before heavy load start), while the SECURED OFF button restores normal load dependent start stop logic. HC REQUESTED/CONNECTED LED is used to indicate the request and connection status of heavy loads (such as large compressors and thrusters), and to achieve sequential start-up of high-power equipment in conjunction with heavy load parameters (HC 1/2 maximum power, load type, confirmation type).

Practical operation of core functions of Utility Software

After the upper computer software is connected through USB or Modbus, the operator can obtain operation capabilities far beyond the local HMI:

1. Overview (Plant)

Real time display of single machine active power, current, phase angle, frequency, voltage, circuit breaker position, regulator status, and current alarm quantity. The symbols for analog instruments and circuit breakers can be customized, making it easy to quickly grasp the overall situation.

2. Historical alarms

List all previously activated alarms in a table format, including complete text, timestamp (accurate to milliseconds), active/inactive status, and confirmation status. Supporting sorting and filtering, it is the core tool for fault tracing.

3. Trending

Multiple measurement values (such as active power, frequency, current) can be selected simultaneously to draw the change curve, supporting scaling and translation. It is highly valuable for debugging PID parameters or analyzing load fluctuations.

4. Parameters

List all adjustable parameters by category (generator, busbar, NEL, synchronization, regulation, input/output, etc.). Click on any parameter (such as Reverse power) to bring up the settings window, where you can modify the settings, delay, and associated relays. After modification, it needs to be downloaded to take effect; On the contrary, 'upload' can read the current setting value into the PC backup.

5. Input/Output

Real time display of the status of all digital input/output, analog input/output, and VDO inputs. Support custom text labels (such as "emergency stop", "low oil pressure") for easy on-site recognition.

6. Logs

In addition to event logs, other diagnostic information within the controller can also be read. All logs can be saved as files for long-term archiving or sent to DEIF technical support.

Case Study of Key Protection Parameter Setting (Taking Generator Protection as an Example)

Here are several key points for setting commonly used protection parameters:

1. Reverse power (1001~1016)

Set value: usually set to -5%~-15% (negative values indicate power reversal).

Delay: 5-10 seconds to avoid brief reverse flow (such as during synchronization) and misoperation.