Protection device simultaneously applicable to phase-shifting transformer and generator motor of pumped storage power station

Abstract

The utility model relates to a protection device simultaneously applicable to a phase-shifting transformer and a generator motor of a pumped storage power station. The protection device comprises an alternating current plug-in, a trip-out plug-in and a CPU plug-in, the alternating current plug-in is used for collecting voltage and current of each side of the generator motor and the phase-shifting transformer; and the CPU plug-in is electrically connected with the alternating-current plug-in and the trip-out plug-in respectively, and is used for receiving the voltage and current signals acquired by the alternating-current plug-in, performing protection logic operation on the voltage and current signals and sending a trip-out command to the trip-out plug-in. According to the scheme of the utility model, the utility model provides the protection device which is simultaneously suitable for the pumped storage generator and the phase-shifting transformer, and the design scheme ensures the safe and reliable operation of the pumped storage power station generator set and the phase-shifting transformer; according to the utility model, a user-oriented, product-oriented and application-oriented embedded platform technology is adopted, so that the system is suitable for a wider voltage range, and can be installed and used in pumped storage generator units with different voltage grades and different operating environments.

Description

Technical Field

[0001] The utility model relates to the technical field of relay protection of main equipment in power systems, and particularly to a protection device applicable to both phase-shifting transformers and generator-motors in pumped storage power stations. Background Technique

[0002] The main equipment of large pumped storage power stations includes phase-shifting transformers, generator-motors, and excitation transformers. Transformer protection adopts an integrated main and backup protection scheme, providing all the electrical quantity protection required for phase-shifting transformers and excitation transformers in pumped storage power stations, applicable to various main wiring modes of different units, and capable of meeting the requirements of the electrical monitoring and automation system of power plants. The generator-motor provides all the electrical quantity protection required for a pumped storage generator-motor unit, applicable to various main wiring modes of different units, and capable of meeting the requirements of the electrical monitoring and automation system of power plants. There are the following inconsistencies between the generator-motor protection device and the phase-shifting transformer protection device for the above different requirements. For example, the generator-motor protection device is configured with current channels such as machine-terminal CT, neutral-point CT, and through-core CT, and the voltage channels are configured with machine-terminal PT, machine-terminal neutral-point PT, high-voltage side PT, low-voltage side PT, 20Hz zero-sequence PT, a total of 14 current channels and 13 voltage channels. The overall current channels are few and the voltage channels are many. While the phase-shifting transformer protection current channels are configured with high-voltage side CT, main transformer low-voltage machine-terminal side CT, low-voltage side one CT, low-voltage side two CT, low-voltage side three CT, high-voltage side zero-sequence CT, high-voltage side gap CT, and the voltage channels are configured with high-voltage side PT, low-voltage side PT, etc., a total of 23 current channels and 8 voltage channels. The overall current channels are many and the voltage channels are few. There is a contradiction here. In terms of protection inputs, such as the generator-motor protection device needs to be configured with more inputs, with more protection pressure plates and pumped storage operation status inputs. While the phase-shifting transformer protection device only has a small number of protection pressure plates and phase-changing switch inputs. The protection functions are quite different.

[0003] As can be seen from the above, the traditional solution needs to develop two different devices to solve the differences in sampling channels, input quantities, and protection functions between pumped storage generator-motors and phase-shifting transformers, resulting in partial repetition of the development process and wasting hardware development time and resources. Content of the Utility Model

[0004] The purpose of the utility model is to solve at least one technical problem in the background technique, and provide a protection device applicable to both phase-shifting transformers and generator-motors in pumped storage power stations.

[0005] To achieve the above purpose, the utility model provides a protection device applicable to both phase-shifting transformers and generator-motors in pumped storage power stations, including:

[0006] AC plug-in, trip output plug-in, and CPU plug-in;

[0007] The AC plug-in is used to collect the voltages and currents on each side of the generator motor and the phase-shifting transformer;

[0008] The CPU plug-in is electrically connected to the AC plug-in and the trip output plug-in respectively, and is used to receive the voltage and current signals collected by the AC plug-in, perform protection logic operations on the voltage and current signals, and send a trip command to the trip output plug-in.

[0009] According to one aspect of the present invention, it further includes a rear plug-in chassis, and a motherboard, a power supply plug-in, a rotor grounding plug-in, the AC plug-in, a signal plug-in, the trip output plug-in, an input plug-in, the CPU plug-in, a panel module and a communication processing plug-in are installed in the rear plug-in chassis;

[0010] The CPU plug-in is used to receive the input signals collected by the input plug-in, and the input signals are hard pressure plate signals for protection logic judgment;

[0011] The CPU plug-in is used to receive the analog signals of the rotor grounding plug-in, and after data processing, calculate the rotor grounding resistance and the grounding position for protection logic judgment;

[0012] The CPU plug-in is used to receive the analog signals of the AC plug-in, and after data processing, perform calculations with a fixed operation period, and determine whether the program enters fault calculation or normal operation according to whether the current, voltage, and switch signals meet the starting conditions; in the fault calculation, perform protection discrimination, and send a trip command to the trip output plug-in according to the discrimination result;

[0013] The trip output plug-in is used to receive the instructions of the CPU plug-in and output switch signals for controlling tripping and closing;

[0014] The input plug-in is used to collect external input signals and transmit them to the CPU plug-in;

[0015] The output plug-in is used to receive CPU instructions, output output signals for controlling tripping and closing; output signal quantities for background signal monitoring.

[0016] According to one aspect of the present utility model, a power bus, a CAN bus, an analog bus, and a communication bus are provided on the motherboard. The power supply plug-in is electrically connected to the rotor grounding plug-in, the signal plug-in, the trip output plug-in, the CPU plug-in, the panel module, the communication processing plug-in, and the input plug-in through the power bus; the CPU plug-in is electrically connected to the signal plug-in, the input plug-in, the trip output plug-in, and the rotor grounding plug-in through the CAN bus; the CPU plug-in is electrically connected to the rotor grounding plug-in and the AC plug-in through the analog bus; the communication processing plug-in is electrically connected to the CPU plug-in through the communication bus, the panel module is electrically connected to the communication processing plug-in through the communication bus, and the power supply plug-in, the AC plug-in, the signal plug-in, the trip output plug-in, the input plug-in, the CPU plug-in, the communication processing plug-in, and the rotor grounding plug-in are all connected to the motherboard through pin headers. The panel module is installed at the front of the rear plug-in chassis and connected to the motherboard.

[0017] According to one aspect of the present utility model, the CPU plug-in includes a main CPU plug-in and a slave CPU plug-in;

[0018] The main CPU plug-in and the slave CPU plug-in are set to work in parallel as dual hosts. The trip output plug-in is provided with an interlock circuit. When the main CPU plug-in and the slave CPU plug-in work in parallel and the main CPU plug-in and the slave CPU plug-in issue trip commands simultaneously, the trip output plug-in controls the trip relay to trip.

[0019] According to one aspect of the present utility model, the panel module includes a liquid crystal display screen, an Ethernet communication port, buttons, a signal reset button, and signal lights.

[0020] According to the solution of the present utility model, the present utility model provides a protection device that is simultaneously applicable to a pumped-storage generator and a phase-shifting transformer. The design solution ensures the safe and reliable operation of the generator sets and phase-shifting transformers in a pumped-storage power station;

[0021] The present utility model adopts an embedded platform technology that is user-oriented, product-oriented, and application-oriented, and is applicable to a wider voltage range. It can be installed and used in pumped-storage generator sets with different voltage levels and different operating environments;

[0022] The present utility model uses a set of hardware for both the pumped-storage generator and the phase-shifting transformer protection devices, avoiding repeated development and saving hardware development time and resources;

[0023] The present utility model uses a selection method in software to implement the configuration of the protection functions of the pumped-storage generator and the phase-shifting transformer. Only one set of source programs needs to be maintained during program development, saving software maintenance time. Brief Description of the Drawings

[0024] Figure 1 Schematically showing the structure diagram of a rear - plug - in chassis according to an embodiment of the present utility model;

[0025] Figure 2 Schematically showing the communication connection block diagram of a protection device that is applicable to both the phase - shifting transformer and the generator - motor in a pumped - storage power station according to the present utility model. Detailed Embodiments

[0026] Now, the content of the present utility model will be described with reference to exemplary embodiments. It should be understood that the described embodiments are only for enabling those of ordinary skill in the art to better understand and thus implement the content of the present utility model, rather than implying any limitation on the scope of the present utility model.

[0027] As used herein, the term "comprising" and its variants are to be construed as open - ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "an embodiment" and "one embodiment" are to be construed as "at least one embodiment".

[0028] Figure 1 Schematically showing the structure diagram of a rear - plug - in chassis according to an embodiment of the present utility model. As Figure 1 shown, the height of the rear - plug - in chassis is 8U, the structural dimensions of the rear - plug - in chassis are 354.0×255.0mm×482.0mm, and a motherboard, a power supply plug - in, a rotor grounding plug - in, an AC plug - in, a signal plug - in, a trip output plug - in, an input plug - in, a CPU plug - in, a panel module, and a communication processing plug - in are installed in the rear - plug - in chassis.

[0029] Furthermore, Figure 2 Schematically showing the communication connection block diagram of a protection device that is applicable to both the phase - shifting transformer and the generator - motor in a pumped - storage power station according to the present utility model. As shown in combination Figure 2 herein, in this embodiment, all of the above - mentioned plug - ins are connected to the motherboard through pin headers. The panel module is installed at the front of the chassis and connected to the motherboard. The motherboard includes a power bus, a CAN bus, an analog bus, and a communication bus. The power supply plug - in (not shown in the figure) is electrically connected to the signal plug - in 1, the trip output plug - in 2, the CPU plug - in, the panel module 3, the communication processing plug - in 4, and the rotor grounding plug - in 5 through the power bus; the CPU plug - in is electrically connected to the signal plug - in 1, the input plug - in (not shown in the figure), the trip output plug - in 2, the communication processing plug - in 4, and the rotor grounding plug - in 5 through the CAN bus. The CPU plug - in is also electrically connected to the rotor grounding plug - in 5 and the AC plug - in 6 through the analog bus. The communication processing plug - in 4 is electrically connected to the CPU plug - in through the communication bus. The panel module 3 is electrically connected to the communication processing plug - in 4 through the communication bus.

[0030] In this embodiment, the CPU plug-in adopts a dual-CPU plug-in system, that is, the CPU plug-in includes a main CPU plug-in 7 and a slave CPU plug-in 8. The AC plug-in 6 converts the incoming current and voltage quantities into small voltage signals, and after low-pass filtering, they enter the main CPU plug-in 7 and the slave CPU plug-in 8 respectively. After AD conversion, they enter the CPU plug-in for protection logic operation and tripping output, and at the same time, event recording and communication with the communication processing plug-in are completed. The main CPU plug-in 7 and the slave CPU plug-in 8 are exactly the same modules, both having independent AD conversion channels and fixed value program storage areas, and can perform protection calculations independently. The main CPU plug-in 7 and the slave CPU plug-in 8 are set to work in parallel as dual hosts. The tripping output plug-in 2 is provided with an interlock circuit. When the main CPU plug-in 7 and the slave CPU plug-in 8 work in parallel, only when the main CPU plug-in 7 and the slave CPU plug-in 8 simultaneously issue tripping commands can the tripping relay be started.

[0031] Further, in this embodiment, a total of 6 AC plug-ins are provided. The AC plug-ins are defined such that the first 10 channels are current channels and the last 4 channels are voltage channels. There are a total of 24 voltage channels and 60 current channels, which can simultaneously meet the AC quantities required by the phase-shifting transformer and the generator motor protection device of the pumped storage power station.

[0032] A total of 1 communication processing plug-in is provided, which provides a GPS time synchronization interface, supports IRIG-B time synchronization, and a printer interface. The communication processing plug-in is used to control the touch screen and exchange information between the protection and the monitoring system. The MMI module adopts an embedded operating system. It is connected to the liquid crystal and the touch screen through a communication bus, and at the same time, relevant protection information is transmitted between the CPU and the liquid crystal touch screen through HDLC communication.

[0033] The communication processing plug-in provides an RS232 serial port connected to the printer, and can print directly from the device or print through communication to the background engineer station. Four Ethernet ports are provided for communication with the background engineer station and the monitoring system.

[0034] A total of 1 rotor grounding plug-in is provided, which provides a rotor grounding protection function and can input the positive rotor winding, negative rotor winding, large shaft, and high-power measurement resistance connection terminals. The rotor grounding plug-in internally provides a high-precision kΩ-level test resistance for static debugging of rotor grounding protection; the rotor grounding plug-in also provides 4 - 20 mA for collecting the signal transferred by the rotor voltage through a transmitter.

[0035] A total of 2 tripping output plug-ins are provided, which provide 32 tripping output contacts. Each tripping output contact can be independently set and the tripping output name can be modified through the debugging software, which is suitable for various tripping methods.

[0036] There are a total of 8 signal plugins, providing a total of 53 alarm signal outputs, 2 device alarm contacts, and 2 device abnormal contacts. When the system runs abnormally or the device is abnormal, an alarm signal is sent to prompt relevant personnel to handle it.

[0037] In this embodiment, the CPU plugin is used to receive the input signals collected by the input plugin. The input signals are hard pressure plate signals and are used for protection logic judgment.

[0038] The CPU plugin is used to receive the analog signals of the rotor grounding plugin. After data processing, the rotor grounding resistance and grounding position are calculated and used for protection logic judgment.

[0039] The CPU plugin is used to receive the analog signals of the AC plugin. After data processing, calculations are performed at a fixed operation cycle. Whether to enter the fault calculation or normal operation of the program is determined according to whether the current, voltage, and switch signals meet the starting conditions. Protection discrimination is performed during the fault calculation. A trip command is sent to the trip output plugin according to the discrimination result.

[0040] The trip output plugin is used to receive the CPU plugin instructions and output switch signals for controlling tripping and closing.

[0041] The input plugin is used to collect external input signals and transmit them to the CPU plugin.

[0042] The trip output plugin is used to receive CPU instructions, output output signals for controlling tripping and closing, and output signal quantities for background signal monitoring.

[0043] Further, in this embodiment, the panel module includes a liquid crystal display screen, an Ethernet communication port, buttons, a signal reset button, and signal lights.

[0044] The rated voltage of the power supply plugin of the device is 65V - 260V. The accurate working range of the sampling circuit of the AC plugin for the phase voltage is 0.2V - 200V, and for the current is 0.04In - 40In.

[0045] Due to the differences in function configuration between the phase-shifting transformer protection and the pumped-storage generator protection device, the present utility model can adopt the method of software selection to achieve the switching of different functions.

[0046] According to the above solution of the present utility model, the present utility model provides a protection device that is simultaneously applicable to pumped-storage generators and phase-shifting transformers. The design ensures the safe and reliable operation of the generator sets and phase-shifting transformers in pumped-storage power stations;

[0047] The present utility model adopts an embedded platform technology oriented to users, products, and applications, and is applicable to a wider voltage range. It can be installed and used in pumped-storage generator sets with different voltage levels and different operating environments;

[0048] This utility model uses a set of hardware for the protection devices of the pumped-storage generator and the phase-shifting transformer simultaneously, avoiding repeated development and saving the time and resources for hardware development;

[0049] This utility model realizes the configuration of the protection functions of the pumped-storage generator and the phase-shifting transformer in a way of software selection and matching. Only one set of source programs needs to be maintained during program development, saving the software maintenance time.

[0050] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of this utility model rather than to limit. Although this utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of this utility model.

Claims

1. The protection device is applicable to both the phase-shifting transformer and the generator motor of the pumped storage power station, and is characterized by: include: AC plug-in, trip output plug-in and CPU plug-in; The AC plug-in is used to collect the voltage and current on each side of the generator motor and the phase-shifting transformer; The CPU plug-in is electrically connected to the AC plug-in and the trip output plug-in, respectively, and is used to receive the voltage and current signals collected by the AC plug-in, perform protection logic operations on the voltage and current signals, and send a trip command to the trip output plug-in; The CPU plug-in includes a master CPU plug-in and a slave CPU plug-in; The main CPU plug-in and the slave CPU plug-in are configured to work in parallel as dual hosts, and the trip output plug-in is provided with an interlocking circuit. When the main CPU plug-in and the slave CPU plug-in work in parallel, when the main CPU plug-in and the slave CPU plug-in send out trip commands at the same time, the trip output plug-in controls the trip relay to trip.

2. The protection device for the phase-shifting transformer and the generator motor of a pumped storage power station according to claim 1 is characterized in that: It also includes a rear plug-in chassis, in which a motherboard, a power plug-in, a rotor grounding plug-in, the AC plug-in, a signal plug-in, the trip output plug-in, an input plug-in, the CPU plug-in, a panel module and a communication processing plug-in are installed; The CPU plug-in is used to receive the binary input quantity collected by the binary input plug-in, and the binary input quantity is a hard pressure plate signal, which is used for protection logic judgment; The CPU plug-in is used to receive the analog quantity of the rotor grounding plug-in, and after data processing, calculate the rotor grounding resistance and grounding position for protection logic judgment; The CPU plug-in is used to receive the analog quantity of the AC plug-in, and after data processing, it performs calculations in a fixed operation cycle, and determines whether the program enters fault calculation or normal operation according to whether the current, voltage, and switch quantity meet the starting conditions; it performs protection discrimination in the fault calculation, and sends a trip command to the trip output plug-in according to the discrimination result; The trip output plug-in is used to receive instructions from the CPU plug-in and output a switch value for controlling tripping and closing; The input plug-in is used to collect external input quantities and transmit them to the CPU plug-in; The output plug-in is used to receive CPU instructions, output output quantity, which is used to control tripping and closing; and output signal quantity, which is used for background signal monitoring.

3. The protection device for the phase-shifting transformer and the generator motor of a pumped storage power station according to claim 2 is characterized in that: The motherboard is provided with a power bus, a CAN bus, an analog bus, and a communication bus. The power plug-in is electrically connected to the rotor grounding plug-in, the signal plug-in, the tripping output plug-in, the CPU plug-in, the panel module, the communication processing plug-in, and the input plug-in through the power bus; the CPU plug-in is electrically connected to the signal plug-in, the input plug-in, the tripping output plug-in, the communication processing plug-in, and the rotor grounding plug-in through the CAN bus; the CPU plug-in is electrically connected to the rotor grounding plug-in and the AC plug-in through the analog bus; The communication processing plug-in is electrically connected to the CPU plug-in through the communication bus, the panel module is electrically connected to the communication processing plug-in through the communication bus, the power plug-in, the AC plug-in, the signal plug-in, the trip output plug-in, the input plug-in, the CPU plug-in, the communication processing plug-in and the rotor grounding plug-in are all connected to the motherboard through pin headers, and the panel module is installed on the front of the rear-plug-in chassis and connected to the motherboard.

4. The protection device for the phase-shifting transformer and the generator motor of a pumped storage power station according to claim 2 is characterized in that: The panel module includes a liquid crystal display screen, an Ethernet communication port, buttons, a signal reset button and a signal light.

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