9424200994 Rev U
43
BE1-11
g
Overexcitation (24) Protection
Overexcitation (24) Protection
The overexcitation (24) element monitors the volts per hertz ratio and protects transformers and
generators from the adverse effects of excessive heating resulting from overexcitation. Overexcitation
exists whenever the per unit volts per hertz exceeds the equipment design limitations.
Element logic connections are made on the BESTlogic
™
Plus
screen in BESTCOMS
Plus
®
and element
operational settings are configured on the Overexcitation (24) settings screen in BESTCOMS
Plus
. A
summary of the logic inputs and outputs and operational settings appears at the end of this chapter.
BESTCOMSPlus Navigation Path:
Settings Explorer, Protection, Voltage, Overexcitation (24)
HMI Navigation Path:
Settings Explorer, Protection, Settings Group x (where x = 0 to 3), Voltage
Protection, Overexcitation 24
Element Operation
Overexcitation occurs when a generator or transformer magnetic core becomes saturated. When this
happens, stray flux is induced in non-laminated components, causing overheating. The BE1-11
g
detects
overexcitation conditions with a volts per hertz element that consists of one alarm setting, one inverse
time characteristic with selectable exponents (3 sets of time curves), and two definite-time characteristics.
This allows the user to select an individual inverse-time characteristic, a composite characteristic with
inverse time, and one or two definite-time elements, or a dual-level, definite-time element.
The inverse time characteristic closely approximates the heating characteristic of the protected equipment
as overexcitation increases. A linear reset characteristic provides for the decreasing (cooling) condition.
The overexcitation element responds to the magnitude of voltage versus frequency where the measured
voltage is phase to phase and includes the phase with the frequency measurement element.
Sensing Configuration
The pickup settings determine the V/Hz pickup level. The measured V/Hz is always calculated as the
measured voltage divided by the sensed system frequency. The measured phase depends on the
sensing voltage setting. The 24 element monitors VAB for both 3-wire and 4-wire connections. Thus, the
setting is in VPP/Hz for VT connection = 3W, 4W, AB, BC, CA and VPN/Hz for VT connection = AN, BN,
CN. For more information, refer to the
Configuration
chapter
.
Nominal voltage for the BE1-11
g
is defined as a phase-to-neutral quantity. Nominal V/Hz depends on the
sensing voltage (VT) connection, nominal voltage, and nominal frequency settings. Nominal V/Hz is
calculated as the nominal voltage divided by nominal frequency. For VT connections equal to 3W, 4W,
AB, BC, CA, the nominal voltage (phase-neutral value) must be converted to a phase-phase value by
multiplying by the square root of 3. No additional conversion is required for VT connections equal to AN,
BN, or CN.
For 3W, 4W, AB, BC, or CA phase to phase sensing connections:
Frequency
Nominal
3
V
V/Hz
Frequency
Measured
V
Measured
V/Hz
Nominal
Nominal
Phase
-
Phase
Measured
∗
=
=
Equation 1. V/Hz Measured (3W, 4W, AB, BC, or CA)
For AN, BN, or CN phase to neutral sensing connections:
Frequency
Nominal
V
V/Hz
Frequency
Measured
V
Measured
V/Hz
Nominal
Nominal
-Neutral
Phase
Measured
=
=
Equation 2. V/Hz Measured (AN, BN, or CN)
Содержание BE1-11g
Страница 1: ...INSTRUCTION MANUAL FOR BE1 11g Generator Protection System Publication 9424200994 Revision U Jul 17...
Страница 2: ......
Страница 21: ...9424200994 Rev U 9 BE1 11g Introduction Figure 1 Style Chart...
Страница 22: ...10 9424200994 Rev U Introduction BE1 11g...
Страница 36: ...24 9424200994 Rev U Quick Start BE1 11g...
Страница 44: ...32 9424200994 Rev U Controls and Indicators BE1 11g...
Страница 54: ...42 9424200994 Rev U Contact Inputs and Outputs BE1 11g...
Страница 61: ...9424200994 Rev U 49 BE1 11g Overexcitation 24 Protection Figure 40 Inverse Time Delay and Reset Time...
Страница 62: ...50 9424200994 Rev U Overexcitation 24 Protection BE1 11g...
Страница 68: ...56 9424200994 Rev U Sync Check 25 Protection BE1 11g...
Страница 74: ...62 9424200994 Rev U Phase Undervoltage 27P Protection BE1 11g...
Страница 82: ...70 9424200994 Rev U Negative Sequence Voltage 47 Protection BE1 11g...
Страница 88: ...76 9424200994 Rev U Phase Overvoltage 59P Protection BE1 11g...
Страница 94: ...82 9424200994 Rev U Auxiliary Overvoltage 59X Protection BE1 11g...
Страница 96: ...84 9424200994 Rev U Stator Ground 64G Protection BE1 11g...
Страница 100: ...88 9424200994 Rev U Vector Jump 78V Protection BE1 11g...
Страница 106: ...94 9424200994 Rev U Frequency 81 Protection BE1 11g...
Страница 150: ...138 9424200994 Rev U Power 32 Protection BE1 11g...
Страница 154: ...142 9424200994 Rev U Loss of Excitation Reverse Var Based 40Q Protection BE1 11g...
Страница 158: ...146 9424200994 Rev U Distance 21 Protection BE1 11g...
Страница 170: ...158 9424200994 Rev U Resistance Temperature Detector 49RTD Protection BE1 11g...
Страница 174: ...162 9424200994 Rev U Analog Input Protection BE1 11g...
Страница 192: ...180 9424200994 Rev U Logic Timers 62 BE1 11g...
Страница 198: ...186 9424200994 Rev U Breaker Control Switch 101 BE1 11g...
Страница 206: ...194 9424200994 Rev U Setting Groups BE1 11g...
Страница 236: ...224 9424200994 Rev U Alarms BE1 11g...
Страница 238: ...226 9424200994 Rev U Differential Reporting BE1 11g...
Страница 248: ...236 9424200994 Rev U Demands BE1 11g...
Страница 250: ...238 9424200994 Rev U Load Profile BE1 11g...
Страница 254: ...242 9424200994 Rev U Power Quality BE1 11g...
Страница 262: ...250 9424200994 Rev U Trip Circuit Monitor 52TCM BE1 11g...
Страница 272: ...260 9424200994 Rev U BESTnet Plus BE1 11g Figure 188 Power Quality Page...
Страница 274: ...262 9424200994 Rev U Mounting BE1 11g Figure 190 J Type Case Side Dimensions...
Страница 280: ...268 9424200994 Rev U Mounting BE1 11g Figure 196 Retrofit Mounting Plate Basler P N 9424200073 Part 2...
Страница 282: ...270 9424200994 Rev U Mounting BE1 11g Figure 198 H1 Rack Mount Case Dimensions...
Страница 283: ...9424200994 Rev U 271 BE1 11g Mounting Figure 199 H1 Panel Mount Case Dimensions...
Страница 289: ...9424200994 Rev U 277 BE1 11g Mounting Figure 206 Dovetailing Procedure...
Страница 290: ...278 9424200994 Rev U Mounting BE1 11g...
Страница 297: ...9424200994 Rev U 285 BE1 11g Terminals and Connectors Figure 215 Example of Reversed CT Polarity...
Страница 298: ...286 9424200994 Rev U Terminals and Connectors BE1 11g...
Страница 304: ...292 9424200994 Rev U Typical Connections BE1 11g...
Страница 324: ...312 9424200994 Rev U BESTCOMSPlus Software BE1 11g...
Страница 344: ...332 9424200994 Rev U BESTlogic Plus BE1 11g...
Страница 354: ...342 9424200994 Rev U Communication BE1 11g Figure 263 Modbus Mapping Screen...
Страница 367: ...9424200994 Rev U 355 BE1 11g Timekeeping Figure 275 Front Panel Circuit Board Backup Battery Location...
Страница 370: ...358 9424200994 Rev U Timekeeping BE1 11g...
Страница 374: ...362 9424200994 Rev U Device Information BE1 11g...
Страница 392: ...380 9424200994 Rev U Configuration BE1 11g...
Страница 396: ...384 9424200994 Rev U Introduction to Testing BE1 11g...
Страница 408: ...396 9424200994 Rev U Commissioning Testing BE1 11g...
Страница 422: ...410 9424200994 Rev U Sync Check 25 Test BE1 11g...
Страница 426: ...414 9424200994 Rev U Phase Undervoltage 27P Test BE1 11g...
Страница 442: ...430 9424200994 Rev U Phase Overvoltage 59P Test BE1 11g...
Страница 454: ...442 9424200994 Rev U Auxiliary Overvoltage 59X Test BE1 11g...
Страница 458: ...446 9424200994 Rev U Vector Jump 78V Test BE1 11g...
Страница 466: ...454 9424200994 Rev U Frequency 81 Test BE1 11g...
Страница 496: ...484 9424200994 Rev U Inverse Overcurrent 51 Test BE1 11g...
Страница 516: ...504 9424200994 Rev U Phase Current Differential 87 Test BE1 11g...
Страница 520: ...508 9424200994 Rev U Neutral Current Differential 87N Test BE1 11g...
Страница 526: ...514 9424200994 Rev U Power 32 Test BE1 11g...
Страница 530: ...518 9424200994 Rev U Loss of Excitation Reverse Var Based 40Q Test BE1 11g...
Страница 534: ...522 9424200994 Rev U Distance 21 Test BE1 11g...
Страница 560: ...548 9424200994 Rev U Virtual Control Switches 43 Test BE1 11g...
Страница 570: ...558 9424200994 Rev U Logic Timers 62 Test BE1 11g...
Страница 584: ...572 9424200994 Rev U Troubleshooting BE1 11g...
Страница 614: ...602 9424200994 Rev U Specifications 25 Hz Operation BE1 11g BESTlogic Plus Update Rate cycle...
Страница 622: ...610 9424200994 Rev U Time Curve Characteristics BE1 11g Figure 357 Time Characteristic Curve A Standard Inverse BS 142...
Страница 630: ...618 9424200994 Rev U Time Curve Characteristics BE1 11g Figure 365 Time Characteristic Curve G Long Time Inverse BS 142...
Страница 633: ...9424200994 Rev U 621 BE1 11g Time Curve Characteristics Figure 368 Time Characteristic Curve B Very Inverse BS 142...
Страница 638: ...626 9424200994 Rev U Time Curve Characteristics BE1 11g Figure 373 Time Characteristic Curve C Extremely Inverse BS 142...
Страница 672: ...660 9424200994 Rev U RTD Module BE1 11g...
Страница 694: ...682 9424200994 Rev U BESTCOMSPlus Settings Loader Tool BE1 11g...
Страница 705: ......