Xu Shuang
Ankerui Electric Co., Ltd. Shanghai Jiading 201801
1 Project Overview
This project is a power distribution transformation project of a refinery. The original main transformer of the 110KV/6KV A substation is two two-turn on-load tap-changer, and the 110KVGIS is an internal bridging line with 5 intervals, and 6KV feeds out 76 loops. As the new CFB boiler in the plant is equipped with 2 sets of 30MW generator sets and 35KV grid connection is adopted, the substations are rebuilt and the voltage level is increased to 35KV. In addition to the primary equipment and substation main wiring changes, the distribution automation system is also upgraded. Acrel-2000 intelligent distribution automation system is adopted.
2 Distribution plan design
As the CFB boiler project's new generator set can not meet the grid connection requirements of existing equipment, the project transformation includes:
1) Replace the two main transformers with a voltage rating of 110KV/35KV/6KV and a capacity ratio of 1/1/1;
2) Increase the line interval of 110KV GIS main transformers, and change the main wiring from internal bridge line mode to single bus line segment mode;
3) Add 35KV power distribution equipment to meet the need for new onboard generators in CFB projects;
4) Due to the increase of system short-circuit capacity, the original 6KV switchgear's breaking capacity has not met the requirements, 38 surfaces have been replaced, and other reactors have been added to the front side to limit the short-circuit current.
According to the transformation content, design the power distribution scheme shown in Figure 1. In order to meet the unattended scheme design of the substation integrated automation system, each device in the substation needs to be protected, controlled, measured, and monitored. Therefore, in the design of the secondary solution, AM5 and AM6 series protective devices with protection and monitoring functions are provided in each compartment switch cabinet. The specific equipment is shown in Table 1:
Table 1 Secondary Scheme Protection Equipment
Interval type
product name
Product number
Protective function
1# main change, 2# main change
Transformer differential
Protection and monitoring device
AM6-D3
Transformer differential protection, harmonic brake protection, differential speed protection
Transformer backup protection monitoring and control device
AM6-T
Clearance zero current protection, zero-sequence current protection, zero-sequence voltage protection, over-voltage lockout over-current protection
Transformer non-electric protection device
AM6-FD
Non-electrical protection of main transformer
3# main change, 4# main change
Transformer differential
Protection and monitoring device
AM6-D3
Transformer differential protection, harmonic brake protection, differential speed protection
Transformer backup protection monitoring and control device
AM6-T
Clearance zero current protection, zero-sequence current protection, zero-sequence voltage protection, over-voltage lockout over-current protection
Transformer non-electric protection device
AM6-FD
Non-electrical protection of main transformer
Transformer outlet cabinet
Plant protection device
AM5-T
Three-stage with overpressure and over-current protection and transformer non-electrical protection
PT cabinet
PT monitoring device
AM5-U
PT disconnection monitoring, low voltage alarm, over voltage alarm
Motherboard
Prepare self-protection device
AM5-B
Prepare self-injection device and bus couple protection
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Figure 1 Distribution plan
3 Intelligent Distribution Automation System
The substation adopts a comprehensive automation system and is based on the design of an unattended scheme to protect and monitor all equipment in the substation. All analog and state quantities are collected, processed, and counted, accurately and truly reflected, creating on-site operating conditions for on-duty personnel and meeting the requirements of various types of design specifications, realizing information center and other substation equipment and industries. The communication of the on-site control center can reliably and effectively manage the substation.
Acrel-2000 intelligent distribution automation system adopts an object-oriented hierarchical distributed structure. The entire system can be divided into three layers: station management layer, network communication layer and field device layer. According to the user's power consumption scale, distribution of electrical equipment, and land area, and other aspects of comprehensive consideration, the most appropriate networking method is adopted.
The station control management is located in the central transformer station duty room, including monitoring computers, network switches, printers, UPS, timing devices, telecontrol devices, and Acrel-2000 intelligent power distribution systems. The station control management computer can be placed on the operation desk of the duty room, or it can be installed in the network cabinet to form a monitoring screen. The network communication layer includes communication collectors, optical transceivers, and other network equipment used to connect with the station control layer. It is installed in the communication collection box, and the communication collection box and field device layer devices are installed nearby and mounted on the wall. The communication layer is a physical layer that links up and down. It is responsible for transmitting the information of the device layer device to the station control layer, and the command of the station layer is sent to the device layer device. The field device layer includes AM5 and AM6 series protection devices on the low-voltage cabinets, ASD series switchgear monitoring and control devices, multi-functional power meters, temperature controllers, and DC screens. Acrel-2000 intelligent power distribution system is based on the Windows platform application software, can simulate the user's power distribution network, provide monitoring, remote signaling, remote control, remote adjustment, alarm, reporting, accident analysis and other functions.
3.1 System Configuration of Acrel-2000 Substation
The system configuration diagram of Acrel-2000 substation is shown in Fig. 2. The configuration of the high-voltage partial protection monitoring and control device is shown in Table 1. The measurement and metering devices selected for the low-voltage part are shown in Table 2. The communication network in the institute is laid with a twisted-pair wire to form a bus-shaped network. Considering the long-term scale of substations, it is very flexible to add spacer devices on the network. When any part of the device fails, it only affects the local reliability. The secondary cables are greatly reduced, simplifying the installation and maintenance workload and saving investment.
Table 2 Low-voltage system equipment
product name
Product number
The main function
ACR Series
Network Power Meter
ACR230ELH
Three-phase voltage, current, active, reactive power; four-quadrant electric energy metering; maximum demand; 2-31 harmonic analysis, etc.
Terminal energy meter
DTSD1352
Three-phase current, voltage, active, reactive power, four-quadrant power, etc.
Four remote units
ARTU-K32
Remote signaling unit
ARTU-J16
Remote control unit
ARTU-M32
Telemetry unit
3.2 Station Communication Network
Acrel-2000 adopts a bus-shaped network, which is flexible in configuration and good in scalability. It is very convenient to increase or decrease the number of contacts on the Internet. The input or exit of any node does not affect the normal communication of other nodes; the station increase contact point can be set at any location; Important information such as relay protection actions is prioritized, responds promptly in the shortest time, and communication reliability is high.
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Figure 2 Acrel-2000 Distribution Automation System
3.3 Protection Device Functions and Applications
The selection of this transformation project is Ankerui protection device, which has fault analysis function: event record, fault record, fault record wave; monitoring function: over-limit monitoring; diagnostic function: power-on diagnosis, continuous self-test, test function running status Surveillance; Communication function: The front panel RS232 port is used for local maintenance. The rear panel has 2 interfaces for remote communication. The communication protocol is modbus or 103 optional.
3.3.1 6KV protection monitoring device
Busbar section protection and monitoring device 1 (with preparation for self-investment), selected AMRO-AM5-B. There are 22 line protection and monitoring devices, 3 motor protection and monitoring devices, 4 capacitor protection and monitoring devices, and 4 protection and control devices for distribution transformers. All of them are AM5 devices, followed by AM5-F, AM5-M, AM5-C and AM5. -T. Its protection monitoring and control function protection: multi-phase phase overcurrent protection, ground fault protection; local or remote operation of circuit breakers, circuit breaker fault monitoring, programmable logic program; voltage, current, power, power factor measurement. Specific functions can be seen in Table 1.
Voltage transformer protection monitoring and control device 2 sets, select AM5-U device to achieve low voltage / over voltage protection, zero sequence over-voltage protection, phase voltage / line voltage measurement.
3.3.2 Main transformer protection monitoring screen: 2 sides
Each side of the protection monitoring and control screen is composed of a main transformer differential protection device, a main transformer backup protection device, a high side and a low side, and a measuring device. The main transformer differential protection used AM6-D3 from Ankerui Inc., which includes three-circle differential protection, differential differential speed, second harmonic ratio differential protection, CT disconnection identification, alarm, and differential current limit alarm. Since the ratio of current transformers on each side may be different, there are measures to balance the currents on each side of the differential protection, and the three-side switch of the main transformer. Back-up protection uses AM6-T, three-stage three-times over-voltage lockout over-current protection, overload transmission, start the main transformer air-cooled, three-stage three-time zero-sequence voltage and current protection, PT disconnection alarm. The non-electricity protection of the transformer, gas, temperature, pressure release, oil level anomaly and cooling system fault signal within the transformer body is adopted. AM6-FD is selected. Its main function and technical requirements are that the transformer heavy gas can act on the trip outlet with the time limit of the transformer. Transformer Light gas only acts on the signal; the temperature measuring device of the transformer provides passive contact for non-electricity protection, and signals or trips when the temperature is too high; the oil level measuring device of the transformer provides passive contact for non-electricity protection when the oil level is abnormal. The protection device signals or trips.
3.3.3 35KV Protection and Control Devices
A busbar section protection and monitoring device (optional AM5-B), line protection and monitoring device 6 (optional AM5-F).
3.3.4 Local Monitoring Network Master
The main function is to collect the network information sent by each protection monitoring and control layer device; convert the network information into the format required by the agreement with the background machine; complete the four remote functions with the background; and drive the accident sound and preview sound. In the implementation, when an accident sound or warning sound is issued, a language alarm system is driven, and a clear and clear utterance is used to tell the attendant what happened at the time. The local monitoring network configuration interface is shown in Figure 3.
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Figure 3 Local monitoring network master configuration
3.3.5 Remote Network Master Station
The main function is to collect the network information sent by the protection monitoring and control layer device, convert the network information into the format required by the standard telecontrol protocol, and transmit it to the remote monitoring station; accept the commands of the remote monitoring station to complete the four remote functions; drive the accident sound And notice sound.
3.3.6 Monitoring Host Stations
It is mainly used to adjust and modify the fixed value, and analyzes the accident information sent from the special recording network. The four telematics interfaces configured on the Acrel-2000 power distribution system are shown in Figure 4.
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Figure 4 35KV line transformer protection details
3.3.7 Real-time data acquisition and processing
The system can collect current parameters such as current, voltage, active power, reactive power, frequency, and power factor in real time. Figure 5 shows real-time data acquisition on a capacitor protection device. The analog information is collected periodically according to the scan cycle and the corresponding conversion, filtering, accuracy check, and database update are performed. For the analog quantity required to be recalled, the data recorded from 1 minute before the accident to 5 minutes after the accident can be recalled. It can also monitor the position signals of circuit breakers, disconnectors and earthing switches, relay protection action and alarm signals in real time. The state quantity signal is periodically acquired in a quick scan manner and the status checker database is updated. Signals such as circuit breaker position signals and relay protection operation signals need to be quickly recorded in response to the occurrence of displacement. Figure 6 shows the alarm information collected by the system in real time.
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Figure 5 Real-time data acquisition
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Figure 6 Real-time status and action signal acquisition
The transformer substation of the refinery set a “three-remote†quantity of 1,648 points, including 723 points of remote sensing and 878 points of telemetry, including 182 points of electric energy and 47 points of remote control, which basically reflect the actual operation of the equipment accurately and truly.
4 Equipment List
The list of high voltage equipment in the substation is as follows:
1
Monitoring master station (included)
Quantity
model
unit price
Host: CPU: Core Duo, clock speed: 2.7G, Memory: 2G, Hard disk: 160G, Optical drive: DVD burner, Operating system: Windows XP
1
DELL
7000
Standard keyboard and optical mouse
1
DELL
200
22-inch widescreen LCD monitor
1
DELL
1700
Audio and voice alarm system
1
Lenovo
120
A4 laser printer
1
HP 1108
1300
Monitoring system software
1
Acrel Acrel-2000
60000
2
Communication Interface Cabinet
Communication interface device (double-click redundant configuration)
1
ANet-Lx8
12000
GPS clock synchronization device
1
ATS1000E
6100
Ethernet switch
1
TPLINK
500
UPS Inverter (2KVA/1A)
1
C2K/2KVA
3800
Cabinet
1
5000
3
Main transformer protection monitoring cabinet
2 sides
Main change differential protection device
2
Ankerui AM6-D3
8000
Main transformer backup protection device
6
Acry AM6-T
6000
Main transformer non-electric protection device
2
Ankerui AM6-FD
5000
printer
1
HP 1108
1300
Cabinet
1
PRC
5000
4
Switchgear installation equipment in place
35kV line protection and monitoring device
6
Acrel AM5-F
5000
35kV bus couple protection and monitoring device
1
Ankerui AM5-B
5000
6kV line protection and monitoring device
twenty two
Acrel AM5-F
5000
6kV capacitor protection and monitoring device
4
Ankerui AM5-C
5000
6kV motor protection and monitoring device
3
Ankerui AM5-M
5000
6kV distribution transformer protection and monitoring device
4
Ankerui AM5-T
5000
6kV voltage transformer protection and monitoring device
2
Ankerui AM5-U
5000
6kV self-investment and marriage protection monitoring and control device
1
Ankerui AM5-B
5000
5
Communication cable
Serial Communication Twisted Pair
300 meters
1419A
1400
Ethernet communication twisted pair
200 meters
0-219413
300
5 Conclusion
The application of the Acrel-2000 intelligent distribution automation system is of great significance to improving the safety, stability, reliability, and management of substations, reducing operating and maintenance costs, and improving the economy. The AM5 and AM6 series protection and control devices equipped in the secondary power distribution system integrate protection, measurement, and control. Different protection functions can be flexibly configured for different primary devices, and a comprehensive protection and monitoring of voltage and power distribution stations at voltage levels of 35kV and below can be realized. The function is applicable to the protection and automatic control functions of equipment such as line, bus coupler, distribution transformer, high voltage motor and high voltage capacitor. The device adopts advanced and reliable protection principles and algorithms, strong anti-interference performance, high reliability, flexible implementation of protection, and redundant design for communication. The device adopts full graphic programming technology and can logically program the device as required to meet the requirements of most users. If the protection monitoring and control device needs to replace the protection function during use, it is only necessary to update the built-in logic diagram through the maintenance port of the device, and the implementation mode is simple and flexible.
Through accumulated experience in the design, installation, commissioning, operation and maintenance of the A substation automation system in the implementation, it laid a good foundation for the development of other substation projects of our company.
references:
[1] Vi-S2000 substation integrated automation system application: smart electrical appliances and integrated automation. Yu Kai, Zhu Youzhi
[2] Ankerui Electric Co., Ltd. Product Selection Manual 2013.1.
[3] Ankerui Electric Co., Ltd. Energy efficiency management system design and installation atlas 2013.11.
About the Author:
Xu Shuang, female, Master, Ankerui Electric Co., Ltd., the main research direction for the intelligent distribution system design, Email: mobile phone QQ
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