Bueno Electric BEPR- 554U User manual

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BEPR- 554U
Generator Protection Device
Technical Manual
Operation Manual

Part 1
Technical Manual

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1 Introduction to Device
BEPR- 554U generator protection device is designed specifically for small and medium sized
generators, including generator differential protection and generator backup protection
Function BEPR-554
Differential protection √
Overvoltage protection √
Loss of excitation protection √
Compre ensive 3Uo stator ground protection √
Frequency protection √
One-point ground protection √
Rotator two-point ground protection √
Generator stator ground protection √
Reverse power protection √
Non-electric signal protection √
TA & TV breakage protection √
The device has the following features:
Main processor of the device is Motorola’s 32-bit microprocessor with fast speed, high reliability, rich
resources and big room to expandability;
The whole panel is a 240 × 128 big screen LCD which is operated and displayed in Chinese and has
friendly human-machine interface;
Multiple kinds of communication interfaces Reserved RS-232, RS-485/422, CAN and Ethernet can
conveniently conduct high-speed communication with the local station or remote system;
A/D has high conversion accuracy and fast speed and the device does not need adjustable parts to
automatically adjust sampling accuracy;
The device has well-improved software and hardware watchdog self-test function and automatically
blocks the trip in case of failure of CPU;
The device uses back inserted structure to separate light current from heavy current so as to greatly
enhance anti-jamming property of the device;

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The device has overall, rich and simple debug functions

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2 ardware Configuration of the Device
With an aim to executing the above functions in a set of hardware system and taking flexibility and
adaptability of the device into consideration, modular design is conducted for the device The device is
composed of the following modules:
2.1 AC and DC input module (AC/DC)
Three kinds of converting circuits are set according to different types of input signals
AC voltage: set isolation conversion of intermediate transformer, such as extreme voltage of generator
and high-tension side voltage of main transformer etc
AC current: set isolation conversion of intermediat converter and obtain voltage at secondary side
parallel resistance 1A and 5A converters are selected and secondary resistance is changed to meet the
requirement of measurement ranges of different currents, such as extreme current of generator and neutral
point current etc
DC voltage and current: set advanced isolated conversion of hall sensor, such as rotator voltage of
generator and diverter voltage of rotator
2.2 ost processing module (CPU)
All analogs resulting from conversion by AC and DC input modules can effectively filter out signals
within pass band through active filter with lowpass filtering and bandpass filtering to meet filtering
requirements of different frequency signals and achieve less than 1% of attenuation of fundamental wave,
and concurrently attenuation ratio and phase shift of analogs of all channels can reach good consistency
Figure 2-1: ardware of NSC 554 generator protection device
POWER
POWERPOWER
POWER
AC
ACAC
AC CPU
CPUCPU
CPU
MMI
Conversion
module of
AC and DC
input (TA
and TV etc )
A/D
CPU
Processor
CAN communication
Output
and
signal
Power
Voltage input
Current input
Human-
machine
dialogue
TRIP
TRIPTRIP
TRIP
DC input

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Central processing unit (CPU) is composed of A/D conversion, state quantity input, state quantity
output (used for pulse output of trip and close, alarm signal output, opening of block relay and other signal
outputs), microprocessor CPU, RAM, ROM, FLASH RAM and EEPROM High performance
microprocessor CPU (32-bit), large capacity ROM (256K bytes), RAM(256K bytes) and FLASH RAM (1M
bytes) enable the CPU module to have strong data processing and recording capacity and achieve various
complex fault handling schemes and record a lot of fault data C language programming can enable the
program to have strong reliability, portability and maintainability
All parts relevant to CPU are concentrated in a plug-in unit and all input and output state quantities go
through photoelectric coupling isolation If the parts in this module are in abnormal conditions, then main
processor drives block relay and cuts off OPS at photoelectric coupling output side of state quantity output
Auxiliary processor drives the above block relay when main processor is in abnormal conditions Block
relay will not be reset unless it is powered down Mutual monitoring of dual processors ensures operation
reliability of the device
The terminals of CPU module are used to connect in strap, dedicated input signal, output signal and
position signal required by the CPU
Analog/data conversion (A/D) uses 14-bit high accuracy, high stability, high speed and multi-channel
concurrent conversion unit whose precision working current can reach 0 04In and precision working voltage
can reach 0 2V to enhance measuring accuracy and speed All analogs can effectively filter out, through
lowpass filtering, higher harmonic wave and achieve less than 1% of attenuation of fundamental wave and
attenuation ratio and phase shift of analogs of all channels can reach good consistency
Figure 2-2 Schematic diagram of CPU module
Output
Signal and alarm output
To terminal
CPU
CAN
RAM
ROM
FLASH
I/O
To MMI
Terminal signal
Motherboard signal
EEPROM
Analog
i
nput
A/D conversion
CPU

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2.3 uman-machine module (MMI) module
Human-machine module (MMI) is installed in the rear of the whole panel of the device The module
includes microprocessor (32-bit), large capacity ROM (512K bytes), RAM (1M bytes), FLASH RAM (1M
bytes), EEPROM, input and output state quantity, communication control unit, clock, LCD with big screen
(240 × 128), full screen operating keyboard and signal indicating lamp etc
The module is mainly used for human-machine interface management Its main functions include
keyboard operation, management of liquid crystal display, printing, signal lamp indication, communication
with debug computer, monitoring system of transformer substation or remote safety automated device, GPS
time calibration (minute/second pulse time) and information information with main CPU
The communication with all CPUs uses CAN and the communication rate is 100Kbps, which breaks
through the bottleneck of internal communication of the device and enhances internal information
transmission rate of the device
External communication has three ports, with one being set on the panel and two being set on the back
panel of communication interface module (COM panel) RS232 serial port on the panel is used to be
connected with PC Two communication ports on the back panel of communication interface module can be
set as different physical interfaces as required
485 interface, Ethernet interface and optical fiber interface etc are set up on the back panel to meet
the needs of different automatic system when the device connects in the plant and station automatic systems
The port on the back panel can be set as RS232 interface (used to drive serial printer) or RS422/485
interface (it is used to communication with engineer station or for centralized printing)
Communication specification adopts IEC60870-5-103 specification
Electronic schematic of Human-machine module (MMI) is shown in Figure 2-3:
CPU
Serial interface
RAM
ROM
FLASH
I/O
To CPU module
Communication port
To CPU and control etc
Signal and alarm output
LCD
Keyboard
EEPROM Panel signal
CAN
Ethernet Communication port

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2.4 Output and signal module (TRIP)
This module interfaces with the commands sent by CPU module and provides device
actions and alarm signals which can be transmitted to either signal lamp on the panel or central
signal device Each unit is equipped with a set of three-phase operation circuit Device can
adaptive tripping current, without on-site adjustment
Figure 2-3 Electronic schematic of MMI module

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3 Technical indicators
3.1 Operating environment
Working temperature:-20 ℃～ 60 ℃ , average temperature within 24 hours does not exceed 35 ℃
Storage temperature:-25 ℃～ 80 ℃ , not apply excitation at limiting value; irreversible changes will not
occur in the device The device should normally work after temperature is recovered
Relative humidity: not more than 95% (without dew)
Atmospheric pressure: 80 ～ 110kPa (below relative sea-level elevation of 2KM)
3.2 Nominal parameters
Rated DC voltage: 220V/110V (indicated in the order), around 10W, fluctuation range: -20% ～
+10%
Rated AC data:
Phase voltage: 3/100 V
Line voltage: 100V
AC: 5A/1A (indicated in the order)
Rate frequency: 50Hz
3.3 Technical parameters of device
Input circuit: 24V D C 2 4mA at each point
Output contact rating: 30W( τ =5ms), 220V D C or 0 5A D C
Trip time: ＜ 20ms
Each phase of AC voltage circuit of the device at nominal parameter ≤ 0 2VA
Each phase of AC current circuit of the device at nominal parameter ≤ 0 3VA
Voltage, current and power: 0 5 grade
Phase angle measurement error ≤ 1 °
Impedance measurement error ≤ 5%

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4. Insulating Property
4.1 Insulation resistance
Megohmmeter with open circuit voltage 500V is used to measure insulation resistance of live part and
dead part of the device and casings of the device and electrically unassociated circuits of the device and the
insulation resistances of all circuits with different grades are not less than 100M Ω in atmospheric
conditions of normal test
4.2 Dielectric strength
The device can withstand line frequency pressure test with 50Hz frequency and 2000V voltage and
duration of 1 minute without breakdown and flashover and destroyed components in atmospheric conditions
of normal test The electric potentials of the remaining circuits are interconnected and grounded when
voltage is applied on any circuit during test
4.3 Impulse voltage
Short-time impulse voltage test with 1 2/50µs standard lightning wave is applicable for grounding of
power input circuit, AC input circuit and output contact circuit of the device and between circuits in
atmospheric conditions of normal test and voltage of open circuit test is 5kV
4.4 umid-heat resistance property
The device can withstand humid heat test stated in Chapter 21 of GB7261 The highest test
temperature is +40 ℃ and maximum humidity is 95% and test duration is 48 hours and each cycle lasts
24-hour alternating humid heat test Insulation resistances of all conducting channels to exposed dead metal
part, insulation resistance between casings and between all electrically unassociated circuits should be
measured to be not less than 1 5M Ω and medium VOLTAGE WITHSTAND STRENGTH should be
measured to be not lower than 75% of voltage amplitud in dielectric strength test voltage amplitude stated in
2 3 2 according to 2 3 1 within two hours before the test is finished
4.5 Electromagnetic interference resistance property
4 5 1 Impulsive interference
The device can withstand interference test stated in GB6162 and test power frequencies are 100kHz
and 1MHz and test voltage is attenuating oscillatory wave of common mode 2500V and differential mode
1000V Power is applied on the tested device in advance and interference test voltages are added according
to critical conditions listed in No 3 3 of GB6162 and the device will not have maloperation and reject
operation
4 5 2 Fast transient disturbance