1.4 Measurement and control and other functions
1.4.1 Measurement control function
a、 telemetering
It mainly completes the measurement of voltage, current, zero sequence current, active power, reactive power, power factor, frequency, etc., and can be calculated
The active and reactive kilowatt hours are generated.
According to the number of connected measuring current channels, you can set whether to use the two meter method or the three meter method to measure power in the "operating parameters".
b、 Calibration of measuring channels
1) External AC terminal wiring: measuring current (including phase current and zero sequence current) circuit terminals are connected in series and voltage terminals are connected in parallel (PSP 641U
Three phase symmetrical voltage is required).
2) Offset calibration: no AC current is applied to the external AC terminal. Use "" and "-" in the menu of " factory settings measurement and calibration"
Press the key to select "Offset calibration". After about 10s, under the menu of " Running status Measured value", the relevant current and voltage should be all
0 or close to 0.
3) Gain verification: high incoming current or 1A, phase voltage 100V (three-phase symmetrical voltage 57.74V in PSP 641U). In " factory
Select "Gain Calibration" with "" and "-" keys under the menu of "Setup Measurement and Calibration", and after about 10s, select "Gain Calibration" in " Operation Status
Under the menu of "measured value", the corresponding current should be 5.000A or 1.000A, and the corresponding phase voltage (line voltage in PSP 641U) should be 100V
(The error is within 0.2%), the voltage should be all 0 or close to 0 after disconnecting the AC current.
4) Under the menu of " running settings", operate "electric degree reset".
5) After the device is powered on again, connect the current and voltage. Check the corresponding current and voltage under the menu of " running status measured value"
Size to confirm that the measurement channel has been calibrated.
c、 remote control
10 channels of independent switching value output are provided, and it can support monitoring feedback of control outlet contact. All master station remote control commands will be recorded by the device
Record so as to check with the master station operation record.
d、 Telesignalling
22 channels of DC strong current remote signaling input, breaker position, manual tripping signal, accident and alarm remote signaling, and event sequence recording.
e、 Telepulse
2-channel pulse electric degree input accumulation. It can be used as ordinary remote communication by setting "operation parameters".
1.4.2 Online program upgrade
The upper computer application software SGview is used to realize the online upgrade of the device program with the help of the Ethernet communication port of the device. The method is safe and fast,
Simplifies the process of program upgrade. However, this function is generally only used by professionals of the company.
1.4.3 Print interface
The device can print fixed value, action report, wave recording data, etc. by configuring an Ethernet print server or using 232 port to connect to the printer.
a、 When directly connected to the printer, the wiring mode is as follows:
Device serial port Phoenix terminal 3 (TXD) 5 or 6 (GND) 2 (CTS)
Printer DB25 serial port 3 7 20
b、 When connected to the print sharing module, the wiring mode is as follows:
Device serial port Phoenix terminal 3 (TXD) 5 or 6 (GND) 2 (CTS) 4 (RTS)
Operation Manual of Print Sharing Module DB9 Serial Port 3 5 8 7 PS 640U Series Protection and Measurement Device
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1.5 Information recording and analysis
1.5.1 Protection of information
The device has fault recording function. The recorded analog input and state quantity are the circuit breaker position, protection startup and tripping closing commands.
For each recording band, record the analog quantity and status quantity 100ms before and 200ms after the start of recording
Jump up starting of multiple state quantities. There are 8-100 recordable wave recording reports, and the recorded data can be maintained after power failure. Via master station and slave device
The equipped SGview software can call out the fault recording data from the device and view the corresponding fault data. And can use Comtrade lattice
It provides the possibility for fault playback and fault analysis using professional recording analysis software.
The device can record at least 40 protection action events and alarm events, and the recorded data can be maintained after power failure. Provided with the device
SGview software can also access more records.
1.5.2 Measurement and control information
In the menu "Event recording/tele signaling record", you can view the corresponding tele signaling displacement record. In the menu "Event recording/operation
Record "records all the records of remote control operation of master station, modification of fixed value and enabling/disenabling of soft strap.
None of the above records can be deleted.
1.5.3 Automation system access
The device provides single Ethernet or dual Ethernet communication mode to access various automation systems.
The binary state of the switch value input terminal X2:3 of the device can be changed through the device external accessory - remote/local switching handle. mutually
In response to the ground, the device enters two operation modes, namely "remote" (high level) and "local" (zero level). The device operates in "remote" mode
Under the formula, the master station system can remotely control the circuit breaker, soft strap of switching device and modify the setting value through the device. At this time, the device side of these functions is operated locally
All operations are blocked. When the device operates in the "local" mode, the soft pressing plate can be switched on/off and the setting value can be modified locally through the device keyboard. Remote/local switching
Change the handle and connect the local operation power supply of the circuit breaker at the same time to realize the opening and closing operation of the circuit breaker at the device side. At this time, the downlink command of the corresponding function of the master station will
Is blocked.
1.5.4 Communication and protocol
a) Communication mode
The standard configuration of the device has two 10BASE-T standard Ethernet interfaces for communication with the automation system, and the device can be connected to the single network system or dual network system
Network system operation. Single Ethernet operation adopts A network port access by default, while dual Ethernet operation adopts A and B network ports access at the same time. In the menu " Run
Set the corresponding communication port address under "Line setting HMI setting". It is recommended to use STP5 shielded twisted pair cable for Ethernet as the communication medium.
When Ethernet communication of devices is connected to the automation system, multiple devices are relatively centralized depending on the access hub (HUB)
Master station connection. If the switching hub is not used, the number of connected devices should not exceed 2/3 of the number of accessible devices of the hub,
To ensure the real-time nature of the information sent by the device.
b) Communication and protocol
The communication protocol adopts the power industry standard DL/T 667-1999 (IEC 60870-5-103). Specific protocol text connected to the device,
It can be downloaded from the website of Guodian Nanzi at www.sac-china.com.
When the device is connected to the automation system through Ethernet communication, Class B IP address is used. The network number is 172.20, and the host number takes up 2 bytes.
The host number must be uniformly allocated and managed in the whole station as a good identifier to identify the sub station and the master station. (00. XX), (01. XX)
The address combination of (255. XX), (XX. 00) and (XX. 255) is a reserved address and cannot be used. When routing is used to connect multiple IP networks,
The network other than the main network (172.20 and 172.21) should also use the class B network address. Note that the host number cannot be duplicate. It is recommended to select
Use 172.22, 172.23 and other network numbers first.
1.5.5 Clock synchronization
The device has two timing modes. One is that the master station conducts time synchronization by message through communication. It is recommended to use the pair in the UDP message
Time information. The other is to receive GPS hard timing input and input terminals (X2:16, X2:17). At the same time, the device is equipped with a PS 640U series protection and monitoring device instruction manual
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The hardware clock circuit with high-precision clock chip is combined with any or both of the above time synchronization methods to ensure that it can be connected with the automation system
Better synchronization of clocks.
1.5.6 Submission of measurement control information
After the connection between the device and the master station is completed, the real-time data is usually transmitted in the form of variable upload and cyclic upload. When the input quantity changes
When the measured value changes beyond the limit, the state of the pressing plate changes, or the device acts or alarms, the device will send these changes information
The information is immediately sent to the main station. It is not recommended that the master station frequently use the master call command to increase the network load. Pulse quantity data needs to be read by the master station
Call by the actual value of the measurement group.
1.6 Installation and wiring
1.6.1 Installation dimension
1.6.2 Wiring
In order not to affect the service life of the product and reduce its performance, pay attention to the installation direction and surrounding space, and properly fix it. Please be strict
Connect wires correctly according to the wiring specifications in the engineering design drawing provided with the product.
When the device is installed on the switch cabinet and connected to the horizontal terminal of the switch cabinet, the wiring of different natures connected to the device must be connected separately, and shall not be bound
In one harness. Connections of different natures include AC circuit and DC circuit, strong current circuit and weak current circuit (referring to the circuit with insulation voltage less than 60V). Operation Manual of PS 640U Series Protection, Measurement and Control Device
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In order to prevent accidents and ensure the normal performance of the device, the device must be well grounded. The grounding wire must be a special grounding wire (yellow and green
Color, sectional area not less than 4mm2) is connected to the substation grounding grid through the grounding copper bar, and the grounding method through channel steel grounding is not allowed. According to GB/T
The grounding resistance of 2887-2000 Technical Requirements for Computing Station Site and GB 9361-1988 Safety Requirements for Computing Station Site shall be less than 0.5 Ω.
Terminal wiring shall be operated according to the following specifications
1、 Conductor pretreatment
1. Strip the insulation layer, and the stripping length is 10mm
2. Add cold indenter, multi strand flexible wire is required, and hard wire is not required. The size of the metal part of the cold head shall be greater than 10mm, as shown in the figure below
2、 Wiring
1. The hard wire or multi strand wire with cold head can be directly inserted into the wiring hole, and the multi strand wire shall not be separately crimped with the cold head inserted into the terminal
Wiring holes.
