Device hardware
3.1 Device structure
The device chassis is 4U in height and 19 3 inches in width, complying with IEC60297-3 standard. It is installed integrally in embedded mode, with rear wiring and mounting holes
See Figure 1 for dimensions.
Figure 1 Overall Dimensions and Installation Hole Dimensions of the Device
Figure 1 Overall Dimensions and Installation Hole Dimensions of the Device
3.2 Overview of device functional components
The device adopts the idea of functional modular design. Different products are combined and configured by the same functional components as required, realizing the standard of functional modules
Normalization. The device is composed of AC plug-in, CPU, outlet and power combination plug-in and human-machine interface components. The hardware structure diagram is shown in Figure 2.
General part of CSC-280 series digital protection (measurement and control) device instruction
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Fig. 2 Schematic diagram of hardware module
3.3 AC plug-in
AC module includes voltage converter and current converter, which convert CT or PT secondary side current and voltage into data acquisition system
The signal is processed and plays the role of electrical isolation. The configuration of current voltage converter may be different for different models of devices. At the same time, AC plug
The Iout terminal on the device is 4-20ma output. The location of different models may be different.
3.4 CPU plug-in (CPU)
CPU module is the core module of the device, including CPU system, analog quantity acquisition system, switching value input/output system, real-time hard time
Clock system and high-speed communication system. It is made of multi-layer printed boards and surface mount technology, and a variety of anti-interference isolation measures are taken.
3.5 Output plug-in (DO)
The output module provides protection tripping and closing control, remote control tripping and closing control, action/alarm signal output and other functions, and plays the role of electrical isolation
Use. Among them, all important outlets can only be executed after the starting relay is opened to avoid misoperation caused by component damage.
The tripping module provides circuit breaker position monitoring, tripping and closing holding, anti tripping and other functions. The tripping and closing holding current is adaptive within the range of 0.5~4A,
It is not necessary to change the electrical parameters of the circuit. According to the user's technical requirements, the tripping and closing operation circuit in this module can also be canceled.
3.6 Man machine interface (MMI)
The MMI module uses internal communication to exchange data with the CPU module, providing users with local operation interfaces for the device, including LCD
Display screen, LED indicator, operation keys and RS232 debugging port.
3.7 Power plug-in (POW)
The power module uses the inverter principle to convert the DC 220V/110V input into three groups of DC voltage required by the device for operation
Not sharing the ground and adopting floating ground mode, which plays the role of electrical isolation. In order to improve the anti-interference performance of the power supply circuit, the module has
Anti interference filter devices are installed in the outgoing external 24V power supply circuit. The module is also equipped with complete power protection functions (undervoltage, overvoltage, overvoltage
Current, over power, etc.) to prevent damage to the device caused by power failure. The power module provides 9-way 220V or 110V strong current input and reliable
Electrical isolation.
General part of CSC-280 series digital protection (measurement and control) device instruction
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3.8 Plug in layout
The MMI module is installed in the front panel of the device, and other plug-ins are plugged in from the rear. Figure 3 shows the layout of the device plug-ins, which indicates the standard configuration
The position and arrangement order of the plug-in set down. In engineering applications, the plug-in layout may vary with different hardware configurations. Please refer to
Follow the terminal diagram of each device backplane.
Figure 3 Plug in Layout
General part of CSC-280 series digital protection (measurement and control) device instruction
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4 Measurement and control function and other functions
4.1 Measuring meter
The function of measuring meter includes the calculation of real-time operation data (current, voltage, power) of equipment.
a) Current Ia, Ib, Ic;
b) Voltage Ua, Ub, Uc;
c) Line voltage Uab, Ubc, Uca;
d) Active power P, reactive power Q, power factor cos, Frequency f.
4.2 Circuit breaker control
The normal opening and closing operation of the circuit breaker can be performed through the communication port and the operating handle on the protection panel cabinet.
"Remote/local" input can be set to remote position or local position as high level through internal control word. If it is in remote position, remote position is allowed
The remote control is locked at low power level, and the local operation function is not affected by this input.
4.3 Operation mode control
The device provides 5 sets of constant value management functions, which will not be lost in case of power failure, and can meet the change of operation mode in most cases.
The device provides the soft enabling/disenabling function of main protection elements, and the user can enable/disenable part of the device's protection online through the communication port or device operation interface
The components shall meet the operation needs of the equipment, and the platen state shall not be lost in case of power failure.
4.4 Accident record and analysis
The device can monitor and record the operating conditions of operating equipment, relevant secondary circuits and the device itself in real time, including fault records, wave recording records
Sequence of events record and device operation record. The recorded time scale information comes from the internal clock system of the device, with a time resolution of 1ms. Clock
The system supports network time synchronization, better GPS pulse time synchronization and B code time synchronization. The internal lithium battery provides backup work after the device loses power
Power Supply.
4.5 Fault record
When the device drives the tripping outlet contact, lights the corresponding LED indicator on the panel, drives the accident signal contact and sends the fault report,
At the same time, the data with important reference value at the time of fault shall be recorded for fault analysis. When an accident occurs, these recorded information will be automatically displayed in the device field
At the same time, it is transmitted to the station level control center in real time through the communication port. The device can save the last 40 equipment failure records (no loss in case of power failure),
It can be accessed through the device operation interface or communication port. The main information contained in the fault record is:
a) Fault time mark: date and time;
b) Action event table: action elements, action time;
c) Operating data: electrical quantities such as current and voltage.
4.5.1 Wave recording record
The wave recording function is used to capture the analog quantity data and status quantity data of predefined length before and after an event, and reproduce the protected equipment before the event
The device triggers the wave recording function according to the preset conditions. Wave recording records include 7 analog channels and 16 digital channels
Channel (input, output, etc.) and time scale sequence information. The device records data at 20 points per cycle, 35 points before each record protection starts
Data at 25 points after starting and 40 points after tripping at 20 points before tripping, and the latest 12 wave recording records can be saved. Wave recording can be recorded through EPPC
The tool software is retrieved from the RS232 debugging port on the device panel and can be converted to the COMTRADE general format for other recording components
General part of CSC-280 series digital protection (measurement and control) device instruction
The analysis software or fault simulation software can also be transmitted to the engineer station through the station communication network for protection action behavior analysis.
The operation steps of using EPPC tool software to call wave recording records are as follows: in the commissioning mode, click the main menu accident record record copy
In the record copying dialog box, select the accident record serial number to view, click Copy to copy it to the debugging window, and then right-click the record to display the
Open the shortcut menu and click "Recording Data" to call up the oscillogram.
