CN206481109U - A kind of centralized protection supervisory equipment of 3/2 wiring - Google Patents

Abstract

The utility model provides a kind of centralized protection supervisory equipment of 3/2 wiring, including three CPU cards, respectively process layer interface CPU card, protection CPU card and station level communication cpu plug-in unit；Wherein process layer interface CPU card receives SV signals and the SV signals after snap shot is issued into protection CPU card, while completing the reception and transmission of transformer station general purpose event message (GOOSE) signal with protection CPU card；CPU card is protected according to the SV data-signals of reception, corresponding monitoring and protection action is made, each protection corresponding function module can independent operating, the information sharing between disparate modules can also be realized；Protection CPU card passes through station level communication cpu plug-in unit and station level network service.The utility model improves the integrated level of the wiring protection supervisory equipment of intelligent substation 3/2, and the global reliability of system is improved in the case where device reliability is constant.

Description

A 3/2 Wiring Centralized Protection Measuring and Controlling Device

technical field

The utility model belongs to the field of electric power system relay protection, in particular to a centralized protection measurement and control device with 3/2 wiring.

Background technique

At present, the secondary system of substations, including 500kV smart substations, mainly adopts the concept of hierarchical distributed design, and the devices adopt single-bay design. This mode has the advantages of small impact of device failure, easy reconstruction and expansion, operation and maintenance, etc., but it also has the following disadvantages:

1) The number of secondary equipment is large and the integration level is low

Intelligent substation bay layer and process layer equipment are independently configured according to the interval. One interval equipment includes independent devices such as protection, measurement and control, merging unit, and intelligent terminal. A 500kV substation can reach 200 secondary devices. More monitoring equipment, more secondary equipment, and low integration.

2) The secondary system is complex in composition and heavy in operation and maintenance workload

The protection and control function of the smart substation is realized by multiple devices through "direct mining and direct jumping" and "network mining and network jumping". The optical fiber connection between the devices has many network nodes, and the workload of on-site optical fiber fusion splicing and wiring is heavy, which poses problems in operation and maintenance. increasingly prominent.

Utility model content

The utility model provides a centralized protection measurement and control device with 3/2 connection, which can effectively solve the problems of scattered and independent configuration of secondary equipment, large number of equipment, and complicated operation and maintenance in the current intelligent substation.

A centralized protection measurement and control device with 3/2 wiring, including a protection measurement and control device frame constructed by three CPU plug-ins, the three CPU plug-ins are process layer interface CPU plug-in, protection CPU plug-in and station control layer communication CPU plug-in respectively ;

Among them, the process layer interface CPU plug-in communicates with the process layer of the smart substation communication network, and receives the SV signal sent by the process layer; the protection CPU plug-in communicates with the process layer interface CPU plug-in, and receives the sampling sent by the process layer interface CPU plug-in At the same time, it completes the receiving and sending of the substation general event message (GOOSE) signal between the process layer interface CPU plug-in; the station control layer communication CPU plug-in communicates with the protection CPU plug-in and the station control layer network at the same time.

Further, the CPU plug-in of the process layer interface communicates with the process layer network through optical fiber.

Further, the station control layer communication CPU plug-in uses electrical Ethernet to communicate with the station control layer network.

Further, there is redundant communication between the station control layer communication CPU plug-in and the station control layer network.

Further, the station control layer communication CPU plug-in is connected to a human-computer interaction interface, and the human-computer interaction interface includes buttons and a display.

The utility model provides a 3/2 connection centralized protection measurement and control device, which reduces the number of total station devices in an intelligent substation and improves the overall reliability of the system under the condition that the device reliability remains unchanged.

Description of drawings

Fig. 1 is the overall schematic diagram of the utility model providing device;

Fig. 2 is a schematic diagram of the utility model centralized protection data flow;

Fig. 3 is the structure diagram of the centralized protection hardware of the utility model;

Fig. 4 is a schematic diagram of the working principle of the wire-string integration device.

detailed description

The utility model discloses a centralized protection measurement and control device with 3/2 wiring, which includes three CPU plug-ins, which are process layer interface CPU plug-in, protection CPU plug-in and station control layer communication CPU plug-in, which solves the problem of the number of devices in the current intelligent substation. Many, difficult problems in operation and maintenance.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

A centralized protection measurement and control device with 3/2 wiring. Its core idea is to integrate multiple bay circuit breakers, knife switches, CTs, and PTs into an integrated device, and realize protection measurement and control based on this part of information. and other basic functions; the specific protection scope covered by the centralized protection measurement and control device is shown in Figure 1, including circuit breaker protection, circuit breaker measurement and control, line measurement and control, line protection and main transformer backup protection, etc.; The active protection is realized by other devices.

The device relies on the communication network of the smart substation to receive and send the required data. The current and voltage sampling data is sent by the merging unit to the integrated device through the process layer network, and the intelligent terminal sends the switching signal to the integrated device through the process layer network. After the integrated device is processed by the relevant modules, the trip command sends the substation general event (GOOSE) message to the intelligent terminal through the network, so as to realize the trip. Figure 2 is a schematic diagram of the data flow of the device provided by the present invention. For example: when the protection action of line 1 needs to collect the sampling value information such as current and voltage related to two circuit breakers, and the position information of the circuit breaker, the above information is forwarded by the merging unit and the intelligent terminal to the integrated device through the switch, and the line 1 protection module of the integrated device After processing, the switch trip command is sent to the intelligent terminal related to the circuit breaker through the switch, and then the switch is tripped.

As shown in Figure 3, the utility model adopts 3 CPU plug-ins to build a framework for centralized protection measurement and control. The process layer interface CPU plug-in, as the process bus processing unit, mainly provides redundant 1000M optical Ethernet process bus interface, completes the reception of SV data channels, and the reception and transmission of GOOSE signals, and the received SV data signals are sent after sampling To protect the CPU plugin;

The protection CPU plug-in makes corresponding measurement and control protection according to the received SV data signal. The measurement and control protection includes circuit breaker protection, circuit breaker measurement and control, line measurement and control, line protection and main transformer backup protection, etc.; memory image sharing is adopted between different modules technology, so that the processes of different modules can communicate with each other and be independent of each other. In addition, the protection CPU plug-in communicates with the station control layer network through the station control layer communication CPU plug-in.

Centralized protection measurement and control integrates the functions of multiple intervals or multiple modules, which puts forward higher requirements on the flow access, storage performance, real-time performance and reliability of device access data. For large data traffic access requirements, the CPU processing speed of the centralized protection is based on Gigabit Ethernet, and the protection device is connected to the switch with a Gigabit Ethernet port.

As shown in Figure 4, for the line string, the circuit breaker protection, circuit breaker measurement and control, and line protection are integrated into the design; the line string integration device integrates the original line interval, main transformer interval (line transformer string), and circuit breaker interval function integration design For one device, multiple bay circuit breakers, knife switches, CTs, and PTs are integrated, and all information is unified into the integrated device, and based on this part of the information, basic functions such as circuit breaker protection, circuit breaker measurement and control, and line protection measurement and control are realized. .

Similarly, for the line transformer series, the circuit breaker protection, circuit breaker measurement and control, line protection and main transformer protection are integrated into the design.

The application of the utility model integrates the functions of multiple devices by one device, which solves the problems of scattered and independent configuration of the current secondary devices, and complicated operation and maintenance of a large number of devices.

Claims (5)

1. a centralized protection measurement and control device of 3/2 wiring, it is characterized in that, comprises the protection measurement and control device framework that is constructed by three CPU plug-ins, and described three CPU plug-ins are process layer interface CPU plug-in, protection CPU plug-in and Station control layer communication CPU plug-in; The process layer interface CPU plug-in communicates with the process layer of the smart substation communication network to receive the SV signal sent by the process layer; The protection CPU plug-in communicates with the process layer interface CPU plug-in, receives the sampled SV signal sent by the process layer interface CPU plug-in, and simultaneously completes the receiving and processing of the substation general event message (GOOSE) signal with the process layer interface CPU plug-in send; The station control layer communication CPU plug-in communicates with the protection CPU plug-in and the station control layer network at the same time. 2. A 3/2 wiring centralized protection measurement and control device according to claim 1, characterized in that the process layer interface CPU plug-in uses optical fiber to communicate with the process layer network. 3. A 3/2 wiring centralized protection measurement and control device according to claim 1, characterized in that the station control layer communication CPU plug-in uses electrical Ethernet to communicate with the station control layer network. 4. A 3/2 wiring centralized protection, measurement and control device according to claim 1, characterized in that the communication CPU plug-in of the station control layer communicates redundantly with the network of the station control layer. 5. A 3/2 wiring centralized protection measurement and control device according to claim 1, characterized in that the station control layer communication CPU plug-in is connected with a man-machine interface, and the man-machine interface includes buttons and a display.