Converter station measurement and control protection signal transmission architecture
By introducing signal expansion panels and signal output switches into the converter station and utilizing optocoupler switching technology to achieve signal transmission, the problems of redundant signal wiring and insufficient reliability in early converter stations have been solved, realizing an efficient and economical signal transmission and transformation solution.
Patent Information
- Application Number
- CN202520153697.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Early converter stations had redundant signal wiring in their measurement and control devices, resulting in high wiring costs and insufficient reliability. Upgrades required modifications to the equipment-side circuits, and existing upgrade methods could not achieve unimpeded signal extraction from multiple measurement and control devices.
The system employs a combination of signal expansion panels and signal output switches, and achieves signal transmission through optocoupler input. All wiring is concentrated on one side of the control room. The signal expansion panel includes multiple parallel expansion relays, and the original signal switch and the mapped signal switch are in the same state, enabling reliable transmission of multiple signals.
It reduces the workload of modifying primary equipment, improves the reliability of signal transmission, reduces the difficulty and economic cost of modification, and enables unimpeded extraction of multiple signals.
Smart Images
Figure CN223885004U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power transmission and distribution technology, and specifically discloses a signal transmission architecture for converter station measurement, control and protection. Background Technology
[0002] As the service life increases, the secondary equipment of the early converter stations built in my country is gradually aging, the failure rate of DC control and protection systems is gradually increasing, and there is a shortage of spare parts, which seriously affects the safe and stable operation of the power system.
[0003] Currently, the monitoring and control devices of newly built converter stations are all designed according to the following standards: Figure 2 As shown, the complete dual configuration from primary equipment to secondary control and protection effectively improves reliability. However, the simple dual configuration leads to redundant wiring on the primary equipment side, hindering on-site management, especially for large equipment, where wiring costs are high. Early converter stations, particularly those using Siemens technology, had their measurement and control devices configured as single sets, and the relevant signal nodes of the primary equipment were also configured as single sets, lacking the capability for multiplexing. Furthermore, the service life of primary equipment is typically considered to be 40 years, while the service life of secondary control and protection devices is typically considered to be 15 years. This mismatch in service life and economic considerations mean that retrofit projects usually retain the primary equipment and only upgrade the secondary control and protection devices. However, previous retrofit projects often used hard connections to connect signals to both measurement and control terminals (e.g., ...). Figure 3 As shown in the figure, the essence is still that a single signal cannot be extracted by multiple different measurement and control devices without obstacles, resulting in insufficient reliability and a tendency to cause cross-current problems (the power supply comes from different power supplies in the power distribution equipment area of the converter station). The circuit on the primary equipment side still needs to be modified during the renovation. Utility Model Content
[0004] To address the technical problems listed in the background section, this utility model provides a signal transmission architecture for converter station monitoring and protection. The specific technical solution is as follows:
[0005] A converter station measurement and control protection signal transmission architecture includes a signal expansion panel and a signal output switch located in the measurement and control room, and an original signal switch located in the power distribution equipment area of the converter station. The signal expansion panel includes multiple parallel expansion relays, each expansion relay including a coil and a contact pair constituting a mapped signal switch. One end of the original signal switch is connected in series with the coil and electrically connected to the positive signal terminal of the measurement and control room, and the other end is electrically connected to the negative signal terminal of the measurement and control room. One end of each mapped signal switch is electrically connected to the positive signal terminal of the measurement and control room, and the other end is connected in series with the signal output switch and electrically connected to the negative signal terminal of the measurement and control room.
[0006] Preferably, the signal output switch is an optocoupler switch.
[0007] Preferably, all original signal switches are consistent with the switch state of the corresponding mapping signal switch.
[0008] Preferably, the plurality is 4 or 8.
[0009] Preferably, the electrical connection is through a wire connection, and the current flowing in the wire is direct current or alternating current.
[0010] 1) Multiple sets of signal transmission wiring occur on the side of the measurement and control room, and there is no redundant wiring on the primary equipment side. When the measurement and control device needs to be replaced in the later period, the primary equipment in the early period does not need to be modified and upgraded, thereby reducing the workload.
[0011] 2) Multiple signal extraction of the converter station measurement and control device is achieved from one side of the measurement and control room, and the manufacturer does not need to develop different control protection, thereby improving the reliability.
[0012] 3) If the primary equipment needs to be modified and upgraded in the future, since the measurement and control device interface is completely compatible, the modification difficulty is greatly reduced, and the economy is good. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a wiring schematic diagram of the measurement and control protection signal transmission architecture of the converter station in the embodiment of the utility model.
[0014] Figure 2 It is a measurement and control device circuit architecture schematic diagram of the newly-built converter station in the background technology.
[0015] Figure 3 It is a one-to-two protection signal wiring schematic diagram in the background technology. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be described below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0017] REFERENCE Figure 1The embodiment provides a converter station measurement and control protection signal transmission architecture, which comprises double measurement and control device set A and measurement and control device set B, a signal expansion screen and primary equipment. A signal output switch, i.e. an optical coupling input, is connected in each measurement and control device loop. The signal expansion screen comprises a plurality of parallel expansion relays, each of which comprises a coil and a contact pair forming a mapping signal switch. One end of the original signal switch is electrically connected to a signal positive terminal of a measurement and control room after being connected in series with the coil, and the other end is electrically connected to a signal negative terminal of the measurement and control room. One end of each mapping signal switch is electrically connected to the signal positive terminal of the measurement and control room, and the other end is electrically connected to the signal negative terminal of the measurement and control room after being connected in series with the optical coupling input. The switching states of all original signal switches and corresponding mapping signal switches are consistent. All control circuits can be connected with alternating current or direct current.
[0018] Each original signal switch corresponds to eight relay coils, four of which control the contact pairs connected to the measurement and control device set A, and the other four control the contact pairs connected to the measurement and control device set B.
[0019] During normal operation, when a certain measurement and control parameter reaches a threshold value to cause the state of the original signal switch to change, the expansion relay is actuated, so that the switching state of the mapping signal switch is changed accordingly, the optical coupling input is connected, and the state of the multiple mapping signal switches is received by the measurement and control device.
[0020] When a certain measurement and control device needs to be updated, it can be replaced only from the standard interface in the measurement and control room, and the primary equipment side can work normally and is not affected.
[0021] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A transmission station measurement and control protection signal transmission architecture, characterized in that, The signal extension screen and the signal output switch are arranged in the control room, and the original signal switch is arranged in the power distribution device area of the converter station; the signal extension screen comprises a plurality of parallel extension relays, each of which comprises a coil and a contact pair constituting a mapping signal switch; one end of the original signal switch is electrically connected to the signal positive terminal of the control room after being connected in series with the coil, and the other end is electrically connected to the signal negative terminal of the control room; one end of each mapping signal switch is electrically connected to the signal positive terminal of the control room, and the other end is electrically connected to the signal negative terminal of the control room after being connected in series with the signal output switch.
2. The converter station measurement and control protection signal transmission architecture of claim 1, wherein, The signal output switch is an optical coupling input.
3. The converter station measurement and control protection signal transmission architecture of claim 2, wherein, The switching states of all original signal switches and their corresponding mapping signal switches are consistent.
4. The converter station measurement and control protection signal transmission architecture of claim 3, wherein, The plurality is 4 or 8.
5. The measurement and control protection signal transmission architecture of a converter station according to claim 4, characterized in that, The electrical connection is achieved by a wire, and the current flowing through the wire is direct current or alternating current.