Basler-electric DECS-400 User Manual Page 58
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46 9369700990 Rev R
Figure 14. Inverse Time Characteristic for Takeover-Style OEL
The inverse time characteristic is defined by the following equation:
Where:
t
pickup
= time to pickup in seconds
A = –95.908
B = –17.165
C = 490.864
D = –191.816
TD = time dial setting <0.1, 20>
MOP = multiple of pickup <1.03, 2.5>
Once the field current decreases below the dropout level (95% of pickup), the function is reset based on
the following curve equation:
Each mode of operation (off-line and on-line) has a Low Level setting, a High Level setting, and a Time
Dial setting. Each Low Level setting has a setting range of 0 to 11,999 Adc with 0.01 Adc increments.
Each High Level setting has a setting range of 0 to 9,999 Adc with 0.01 Adc increments. Each Time Dial
setting has a setting range of 0.1 to 20 seconds with 0.1 second increments.
The two current thresholds are defined by the Off-Line Low Level, Off-Line High Level, On-Line Low
Level, and On-Line High Level settings. Each Low level setting has a setting range of 0 to 11,999 Adc
with 0.01 Adc increments. Each High Level setting has a setting range of 0 to 9,999 Adc with 0.01 Adc
increments. The Time Dial settings have a setting range of 0.1 to 20 seconds with 0.1 second increments.
Underexcitation Limiter
The underexcitation limiter UEL senses the leading var level of the generator and limits any further
decrease in excitation to prevent loss of synchronization and limit end-iron heating. The (UEL) operates in
all modes. Through user-configurable logic, the UEL can be disabled only in FCR mode. In this
circumstance, underexcitation is only annunciated—not limited.
An internally-generated UEL curve or user-defined UEL curve may be specified. If the customized curve
is selected and if a zero setting is entered for kW point 2 or kvar point 2, the UEL will use the internally-
generated UEL curve. The internally-generated curve is based on the desired reactive power limit level at
zero real power with respect to the generator voltage and current rating. The following equation illustrates
the internally-generated UEL curve:
Functional Description DECS-400
- INSTRUCTION MANUAL 1
- Preface 3
- 9369700990 Rev R iii 5
- DECS-400 Preface 5
- Contents 7
- General Information 13
- Generator Voltage Regulation 14
- Control Output 14
- Stability 14
- Overexcitation Limiters 16
- Minimum Excitation Limiter 16
- Stator Current Limiter 16
- Reactive Power Limiter 17
- Protective Functions 17
- Programmable Logic 17
- Model and Style Number 19
- Human-Machine Interface 21
- Menu System 22
- Editing Settings 32
- Password Protection 33
- Metering Screen 34
- Setpoint 35
- Percent of Range 35
- Alarms Message 36
- Operating Mode 37
- Functional Description 39
- Front Panel Keyboard 41
- Contact Input Circuits 41
- Digital Signal Processor 42
- Microprocessor 42
- IRIG Port 42
- Memory Circuits 43
- Digital to Analog Converter 43
- Control Output Circuits 43
- Meter Driver Circuits 43
- Relay Output Contacts 43
- Front Panel LEDs 44
- Front Panel LCD 44
- RS-232 Communication Port 44
- RS-485 Communication Ports 44
- Startup Functions 45
- Control Modes 46
- Field Overvoltage 50
- Generator Undervoltage 50
- Generator Overvoltage 50
- Loss of Sensing Voltage 50
- Power Supply Low 51
- Loss of Field (40Q) 51
- Field Overtemperature 52
- Volts per Hertz (24) 52
- MEASURED 53
- Exciter Diode Monitor (EDM) 54
- Limiter Functions 55
- Overexcitation Limiter 56
- TIME IN SECONDS 57
- Underexcitation Limiter 58
- (0.49 x kW 59
- 1.0) x kvar_level 59
- Underfrequency Limiter 59
- GENERATOR VOLTS 60
- Var Limiter 61
- Limiter Scaling 61
- Droop Compensation 61
- Reactive Differential 61
- Line Drop Compensation 61
- Autotracking 62
- Data Recording and Reporting 62
- Data Logging 63
- Power System Stabilizer 64
- PSS Theory of Operation 65
- Figure 19. Speed Signal 66
- Stabilizing 67
- Compensation 67
- SSW 5SSW 4 67
- P0026-21 68
- 12-09-04 68
- Figure 26. Output Stage 69
- BESTCOMS™ Software 71
- Communication 73
- Modem Communication 75
- System Configuration 75
- Settings 83
- Gain Settings 89
- Figure 44. PID Calculator 90
- Protection 100
- Metering 110
- Data Log 114
- 9.22936 ×= 121
- Analysis 123
- Caution 126
- 9369700990 Rev R 115 127
- DECS-400 BESTCOMS™ Software 127
- Installation 133
- 122 9369700990 Rev R 134
- Installation DECS-400 134
- 9369700990 Rev R 123 135
- DECS-400 Installation 135
- Connections 137
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- Table 13. IRIG Terminals 141
- Cross-Current Compensation 144
- Typical Interconnections 145
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- 9369700990 Rev R 135 147
- Communication Connections 148
- P0026-01 149
- 10-01-04 149
- Commissioning 151
- Warning! 154
- Recommended PSS Testing 159
- Maintenance 161
- Backup Battery Replacement 164
- Upgrading DECS-400 Firmware 164
- Specifications 169
- Generator Current Sensing 170
- Field Voltage and Current 170
- Field Isolation Module 170
- Contact Inputs 170
- Control Outputs 171
- Metering Outputs 172
- Contact Outputs 172
- Communication Ports 172
- Regulation Accuracy 173
- Metering Accuracy 174
- Traverse Rates 174
- Setpoint Tracking 174
- Soft Start 175
- Sequence of Events Recording 175
- Data Logging (Oscillography) 175
- Trending 175
- Limiters 175
- Underexcitation 176
- Protection Functions 177
- Type Tests 178
- Agency Certifications 178
- Real-Time Clock Battery 178
- Environment 179
- Physical 179
- Logic Schemes 182
- 9369700990 Rev R 171 183
- DECS-400 Programmable Logic 183
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- Programmable Logic DECS-400 184
- 9369700990 Rev R 173 185
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- 9369700990 Rev R 183 195
- Logic Scheme Modification 196
- Logic Definitions 207
- Outputs 210
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- Relay Output 1 through 6 214
- Modbus™ Communication 215
- Modbus Modes of Operation 216
- Serial Transmission Details 216
- Modbus™/TCP 218
- Preset Multiple Registers 219
- Response 220
- Data Formats 221
- Generic Types UI8 and I8 222
- Generic Types UI16 and I16 222
- Generic Types UI32 and I32 222
- CRC Error Check 223
- DECS-400 Register Tables 225
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- Revision History 243
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