Modularized transformer substation PT secondary voltage acquisition device

Abstract

The invention provides a modularized transformer substation PT secondary voltage acquisition device, which comprises a shell, and is characterized in that a main power panel, a voltage acquisition board, a communication board and a main control board are arranged in the shell; the main power supply board can be plugged in a PCI / IDE slot of the main control board and is provided with a state indicating lamp. At least one voltage acquisition board is provided, and the voltage acquisition board can be plugged in a PCI / IDE slot of the main control board and is provided with a plurality of groups of jacks for connecting cables for outputting voltage of the measuring group and the metering group under the plurality of buses; the communication board is plugged in a PCI / IDE slot of the main control board and is provided with a communication interface; and the voltage acquisition board acquires the voltages of the measuring groups and the metering groups under the plurality of buses, and the main control board performs digital quantity conversion on the effective values and the phases of the voltages, and then the communication board forms messages and sends the messages to external equipment. According to the invention, the acquisition work of the secondary voltage is modularly designed, so that the accuracy and efficiency of voltage acquisition can be improved, and the support in the aspect of data acquisition technology can be provided for complex operation of multiple groups of voltage components.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a modular substation PT secondary voltage acquisition device. Background Art

[0002] Voltage transformer (PT) is an important primary measurement device in substations. The secondary standard voltage it converts is used in protection, measurement, metering and other aspects. It is an important basis for voltage monitoring, protection analysis and grid stability maintenance.

[0003] However, the traditional PT secondary voltage collection method is mainly based on mechanical repetitive work, which is not only low in technical content, but also time-consuming and labor-intensive. Even if the staff has a strong level of skills, they are often prone to inaccurate data measurement due to negligence. In serious cases, the voltage circuit may be short-circuited due to miswiring, which poses a considerable threat to work progress, equipment and personal safety. In addition, the traditional PT secondary voltage collection method is also limited by the distance between panels and cabinets and the function of the equipment, and there are shackles when facing complex calculations of multiple groups of voltage components in cross-panel or cross-level scenarios.

[0004] Therefore, a new PT secondary voltage collection method is urgently needed. By modularizing the secondary voltage collection work, it can not only help improve the accuracy and efficiency of voltage collection, but also provide data collection technology support for complex calculations of multiple groups of voltage components. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a modular substation PT secondary voltage acquisition device. By modularizing the secondary voltage acquisition work, it can not only help to improve the accuracy and efficiency of voltage acquisition, but also provide data acquisition technical support for complex calculations of multiple groups of voltage components.

[0006] In order to solve the above technical problems, the embodiment of the present invention provides a modular substation PT secondary voltage acquisition device, including a shell; the shell is provided with a main power board, a voltage acquisition board, a communication board and a main control board with multiple PCI / IDE slots; wherein,

[0007] One side of the main power board can be plugged into a corresponding PCI / IDE slot on the main control board, and the other side is formed with a first status indicator light for indicating whether the working status is normal or abnormal;

[0008] There is at least one voltage acquisition board; one side of each voltage acquisition board can be plugged into a corresponding PCI / IDE slot on the main control board, and multiple groups of jacks are provided on the other side; each group of jacks is connected to a secondary voltage cable for outputting the measurement group voltage and the metering group voltage under the same bus; the measurement group voltage includes A phase voltage, B phase voltage, C phase voltage, residual winding voltage and neutral line voltage; the metering group voltage includes A phase voltage, B phase voltage, C phase voltage and neutral point voltage;

[0009] One side of the communication board can be plugged into a corresponding PCI / IDE slot on the main control board, and at least one communication interface is formed on the side surface of the other side;

[0010] Among them, the main power supply board is used to supply power to all boards; each of the voltage acquisition boards is used to collect the measurement group voltage and metering group voltage under the bus corresponding to the connected secondary voltage cable in real time; the main control board is used to convert the effective value and phase of the measurement group voltage and metering group voltage collected in real time by each voltage acquisition board into digital quantities, and forward them to the communication board; the communication board is used to package the digital quantities forwarded by the main control board into the form of a message, and send it to an external network device or communication device.

[0011] Among them, it also includes: a backup power supply board; among them,

[0012] One side of the backup power board can be plugged into a corresponding PCI / IDE slot on the main control board, and a second status indicator light is formed on the other side to display whether the working status is normal or abnormal; the backup power board is used to take over the main power board to supply power to all boards when the main power board is disabled or fails.

[0013] Wherein, the main power board and the backup power board both output 110 / 220V direct current.

[0014] Among them, the busbar corresponding to each of the voltage collection boards is a busbar at one or more voltage levels of 10kV, 66kV, 110kV, 132kV, 220kV, 230 / 400kV, 330kV, 500kV and 750kV.

[0015] Wherein, the communication interface provided on the communication board includes a Gigabit optical fiber port and a Gigabit Ethernet port.

[0016] Wherein, the shell is made of stainless steel.

[0017] Implementing the embodiments of the present invention has the following beneficial effects:

[0018] The present invention adopts a modular design and synchronously collects the measurement group voltages and metering group voltages under multiple bus lines based on a voltage acquisition board. After digital quantity conversion by the main control board, it is sent to external equipment by the communication board, which can not only help improve the accuracy and efficiency of voltage acquisition, but also provide data acquisition technology support for complex calculations of multiple groups of voltage components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0020] Figure 1 A schematic structural diagram of a modular substation PT secondary voltage collection device provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Rear view of a single voltage acquisition board;

[0022] Figure 3 for Figure 2 Application scenario diagram. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown in the figure, a modular substation PT secondary voltage collection device is proposed in an embodiment of the present invention, including a housing 1 made of stainless steel or other metals; a main power board 11, a voltage collection board 12, a communication board 13 and a main control board (not shown) with multiple PCI / IDE slots (not shown) are arranged in the housing 1; wherein,

[0025] One side of the main power board 11 can be plugged into a corresponding PCI / IDE slot on the main control board, and a first status indicator light (not shown, such as an LED light) is formed on the other side to indicate whether the working status is normal or abnormal; at this time, the main power board 11 provides 110 / 220V DC power;

[0026] There is at least one voltage acquisition board 12; one side of each voltage acquisition board 12 can be plugged into a corresponding PCI / IDE slot on the main control board, and a plurality of jacks 121 are provided on the other side; each jack 121 is connected to a secondary voltage cable (not shown) for outputting the measurement group voltage and the metering group voltage under the same bus; the measurement group voltage includes the A phase voltage U A , B phase voltage U B 、C phase voltage U C , residual winding voltage U L and neutral line voltage U N ; The voltage of the metering group includes the A phase voltage U a , B phase voltage U b 、C phase voltage U c and neutral point voltage U n ; Wherein, the busbar is a busbar at one or more voltage levels of 10kV, 66kV, 110kV, 132kV, 220kV, 230 / 400kV, 330kV, 500kV and 750kV; It should be noted that the secondary voltage cable is the cable led out from the terminal block on the PT interface panel, and the cable introduced into the terminal block is the output cable corresponding to the busbar through the PT winding; In an example, Figure 3 As shown, the secondary voltage cable corresponding to the output measurement group voltage and metering group voltage under the 110kV 1M bus is led to the voltage acquisition board 12;

[0027] One side of the communication board 13 can be plugged into a corresponding PCI / IDE slot on the main control board, and at least one communication interface (not shown) is formed on the other side; wherein the communication interface includes but is not limited to a Gigabit optical fiber port and a Gigabit Ethernet port;

[0028] Among them, the main power supply board 11 is used to supply power to all boards; each voltage acquisition board 12 is used to collect the measurement group voltage and metering group voltage under the bus corresponding to the connected secondary voltage cable in real time; the main control board is used to convert the effective value and phase of the measurement group voltage and metering group voltage collected in real time by each voltage acquisition board 12 into digital quantities, and forward them to the communication board; the communication board 13 is used to package the digital quantities forwarded by the main control board into the form of a message, and send it to an external network device or communication device.

[0029] In the embodiment of the present invention, the secondary voltage collection device further includes: a backup power supply board 14; wherein,

[0030] The backup power board 14 provides 110 / 220V DC power, one side of which can be plugged into a corresponding PCI / IDE slot on the main control board, and the other side is formed with a second status indicator light (not shown) for displaying whether the working status is normal or abnormal; at this time, the backup power board 14 is used to take over the main power board 11 to supply power to all boards when the main power board 11 is disabled or fails.

[0031] It can be understood that the shell of the secondary voltage acquisition device is a rectangular parallelepiped, and the specific size depends on the reserved space of the screen cabinet and the number of busbars involved in the device, and is fixed by setting a mounting panel and a rack inside the PT interface screen. At the same time, looking directly at the outside of the shell of the secondary voltage acquisition device, it can be found that the shell is provided with a third status indicator light reflecting the normal or abnormal operating state of the secondary voltage acquisition device. At this time, the control of the third status indicator light is controlled by the main control board. When looking back at the outside of the shell of the secondary voltage acquisition device, the first status indicator light of the main power board 11, the jack 121 of the voltage acquisition board 12, the communication interface of the communication board 13 and the second status indicator light of the backup power board 15 can be found.

[0032] A method of using a modular substation PT secondary voltage collection device in an embodiment of the present invention is as follows:

[0033] 1) Check the device for fastening and grounding. Tighten the screws of the mounting panel and check whether the protective grounding is in good condition.

[0034] 2) Power on the device. First, check whether the amplitude of the DC power supply is normal, whether there is AC / DC voltage parasitism, and check the positive and negative polarity before powering on. Then, after powering on, check whether the "Run" indicator light (i.e. the third status indicator light) on the outside of the device housing is correctly and steadily lit.

[0035] 3) Network configuration. Connect the device, switch and debugging computer through the network cable, and configure and download the IP address, VLAN and network port. Then, use the message capture tool to verify the message upload frequency and message integrity, and check whether the device sampling zero drift meets the requirements without adding any experimental quantity.

[0036] 4) Sampling test. Lead the spare cable from the spare terminal of the PT interface panel to the voltage collection board 12 of the device, use the relay protection experimental instrument to test each group of voltage collection channels of the voltage collection board 12, and verify the sampling accuracy and correctness of the voltage amplitude and phase by adding three-phase asymmetric analog voltage.

[0037] 5) Actual wiring. After the sampling function is verified to be correct, lead out the voltage cables of each group under each busbar from the PT interface panel to the voltage collection board 12 of the device, and pay attention to prevent the risk of electric shock and voltage circuit short circuit.

[0038] Implementing the embodiments of the present invention has the following beneficial effects:

[0039] The present invention adopts a modular design and synchronously collects the measurement group voltages and metering group voltages under multiple bus lines based on a voltage acquisition board. After digital quantity conversion by the main control board, it is sent to external equipment by the communication board, which can not only help improve the accuracy and efficiency of voltage acquisition, but also provide data acquisition technology support for complex calculations of multiple groups of voltage components.

[0040] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A modular substation PT secondary voltage collection device, characterized in that: It includes a housing; the housing is provided with a main power supply board, a voltage acquisition board, a communication board and a main control board with multiple PCI / IDE slots; wherein, One side of the main power board can be plugged into a corresponding PCI / IDE slot on the main control board, and the other side is formed with a first status indicator light for indicating whether the working status is normal or abnormal; There is at least one voltage acquisition board; one side of each voltage acquisition board can be plugged into a corresponding PCI / IDE slot on the main control board, and multiple groups of jacks are provided on the other side; each group of jacks is connected to a secondary voltage cable for outputting the measurement group voltage and the metering group voltage under the same bus; the measurement group voltage includes A phase voltage, B phase voltage, C phase voltage, residual winding voltage and neutral line voltage; the metering group voltage includes A phase voltage, B phase voltage, C phase voltage and neutral point voltage; One side of the communication board can be plugged into a corresponding PCI / IDE slot on the main control board, and at least one communication interface is formed on the side surface of the other side; Among them, the main power supply board is used to supply power to all boards; each of the voltage acquisition boards is used to collect the measurement group voltage and metering group voltage under the bus corresponding to the connected secondary voltage cable in real time; the main control board is used to convert the effective value and phase of the measurement group voltage and metering group voltage collected in real time by each voltage acquisition board into digital quantities, and forward them to the communication board; the communication board is used to package the digital quantities forwarded by the main control board into the form of a message, and send it to an external network device or communication device.

2. The modular substation PT secondary voltage acquisition device according to claim 1, characterized in that: Also includes: Backup power board; wherein, One side of the backup power board can be plugged into a corresponding PCI / IDE slot on the main control board, and a second status indicator light is formed on the other side to display whether the working status is normal or abnormal; the backup power board is used to take over the main power board to supply power to all boards when the main power board is disabled or fails.

3. The modular substation PT secondary voltage acquisition device according to claim 2, characterized in that: The main power board and the backup power board both output 110 / 220V DC power.

4. The modular substation PT secondary voltage acquisition device according to claim 3 is characterized in that: The busbar corresponding to each of the voltage collection boards is a busbar at one or more voltage levels of 10kV, 66kV, 110kV, 132kV, 220kV, 230 / 400kV, 330kV, 500kV and 750kV.

5. The modular substation PT secondary voltage acquisition device according to claim 4, characterized in that: The communication interface provided on the communication board includes a Gigabit optical fiber port and a Gigabit Ethernet port.

6. The modular substation PT secondary voltage acquisition device according to claim 5, characterized in that: The shell is made of stainless steel.

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