Main and standby switching system for transformer in transformer area

Abstract

The utility model discloses a transformer main and standby switching system in a transformer area. The system comprises a main transformer, a standby transformer, a bus tie circuit breaker, a first circuit breaker, a second circuit breaker, a fusion terminal, a first LTU device and a second LTU device. The first circuit breaker is arranged at the wire outlet end of the main transformer, and the second circuit breaker is arranged at the wire outlet end of the standby transformer; the main transformer is respectively connected with the fusion terminal and the bus tie circuit breaker through the first circuit breaker; the fusion terminal is connected with the first LTU device, the second LTU device, the bus tie circuit breaker and the second circuit breaker. And the first LTU device and the second LTU device are connected with the second circuit breaker. According to the utility model, the technical problem of how to accurately and rapidly carry out real-time fault monitoring on the transformer in the transformer area and realize seamless switching independent power supply is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a main-standby switching system for transformers in a transformer substation. Background Art

[0002] With the progress of society, the power system is an indispensable infrastructure in modern society. However, due to various reasons, faults in the system will inevitably occur, resulting in equipment damage, power outages and even major accidents of personal safety. With the renovation of old substations, on-site design increasingly considers the low failure rate and stability of substations, especially zero tolerance for power outages. Although departments at all levels have emergency plans and measures for faulty equipment such as power outages, it takes a certain amount of time to notify electricians and equipment personnel to deal with them, and uninterruptible power supplies are not very practical, so solving the problem from the root of the equipment is the only correct direction. The patent document with application number 202311567603.5 discloses a power supply disaster prevention method and equipment, which explains the relationship between photovoltaic power generation systems, high-voltage systems, municipal power systems, and distribution systems, and proposes a power supply disaster prevention method for photovoltaic power generation and municipal power systems. It is a main and standby disaster recovery method considered from the power supply end, and the scheme uses the first transformer and the second transformer to sense whether to use the photovoltaic power generation system or the municipal power system according to the preset range, without considering the power outage caused by transformer failures in low-voltage substations. Patent document with application number 202311613016.5 discloses a method for generating a power grid fault recovery strategy under maintenance mode. From the perspective of power grid maintenance, this scheme anticipates faulty equipment, presets multiple fault handling schemes and backup automatic refusal to operate handling. It focuses more on refusal to operate handling and electrical isolation faults. It is too simple to anticipate complex substation faults, and does not involve the main and backup disaster recovery handling of transformers.

[0003] At present, the existing solutions mainly focus on studying the situation of single-point failure of power supply on the power supply side and activating the backup power supply or system. There are fewer studies on transformer failures on the low-voltage distribution side. More studies are being made on the disaster recovery method of photovoltaic system power generation and the existing main power system. There are few studies on the active and standby disaster recovery of control transformers on the low-voltage distribution side. Some solutions propose information on the anticipated multiple faults. When a fault occurs, the fault is electrically isolated, that is, all switches connected to the fault are ensured to be in the disconnected state. After the fault is restored, the switches on both sides of the switches connected to the fault are opened to form physical isolation in order to handle the fault. When the fault is electrically isolated, the operation sequence from the load side to the power side is followed. The research is on the removal of the fault, which still requires personnel to handle. Moreover, the switching of high-risk equipment by voting is too idealistic and not very suitable for the existing low-voltage distribution scenarios.

[0004] At present, there is basically only one transformer in the low-voltage substation. When a fault occurs, it is easy to cause a long power outage and heavy repair pressure. Electricity users have a low tolerance for power outages in the substation transformer, which affects the satisfaction of power service. In the existing technical solutions, power outage alarms are generally used to notify relevant personnel to carry out rapid repairs, but rapid repairs are still not possible, and there will always be power outages. Therefore, it is urgent to propose a transformer master-slave switching system in the substation to solve the technical problem of how to accurately and quickly monitor the faults of the transformers in the substation in real time and realize the seamless switching of the transformer master and standby for independent power supply. Utility Model Content

[0005] The main purpose of the utility model is to propose a transformer main-standby switching system in a transformer substation, aiming to solve the technical problem of how to accurately and quickly monitor the transformer faults in the transformer substation in real time and realize seamless switching of independent power supply.

[0006] To achieve the above-mentioned purpose, the utility model provides a main-standby switching system for transformers in a substation, wherein the main-standby switching system for transformers in a substation includes: a main transformer, a standby transformer, a busbar circuit breaker, a first circuit breaker, a second circuit breaker, a fusion terminal, a first LTU device, and a second LTU device; the first circuit breaker is arranged at the outlet end of the main transformer, and the second circuit breaker is arranged at the outlet end of the standby transformer; the main transformer is respectively connected to the fusion terminal and the busbar circuit breaker through the first circuit breaker; the fusion terminal is respectively connected to the first LTU device, the second LTU device, the busbar circuit breaker and the second circuit breaker; the first LTU device and the second LTU device are connected to the second circuit breaker.

[0007] In one of the preferred solutions, open-type current / voltage transformers are provided on the outgoing line sides of the bus tie circuit breaker, the first circuit breaker and the second circuit breaker.

[0008] In one of the preferred solutions, the fusion terminal collects the exchange data of the bus tie circuit breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device through the RS485 bus.

[0009] In one of the preferred solutions, the transformer active / standby switching system in the substation further includes a power supply device, which is respectively connected to the bus tie circuit breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device.

[0010] In one of the preferred solutions, the power supply device is an uninterruptible power supply device.

[0011] In the above technical scheme of the utility model, the transformer main-standby switching system in the substation area includes: a main transformer, a standby transformer, a busbar circuit breaker, a first circuit breaker, a second circuit breaker, a fusion terminal, a first LTU device, and a second LTU device; the first circuit breaker is arranged at the outlet end of the main transformer, and the second circuit breaker is arranged at the outlet end of the standby transformer; the main transformer is respectively connected to the fusion terminal and the busbar circuit breaker through the first circuit breaker; the fusion terminal is respectively connected to the first LTU device, the second LTU device, the busbar circuit breaker, and the second circuit breaker; the first LTU device and the second LTU device are connected to the second circuit breaker. The utility model solves the technical problem of how to accurately and quickly monitor the faults of transformers in the substation area in real time and realize seamless switching of independent power supply.

[0012] In the utility model, the circuit connection is designed by setting multiple circuit breakers and LTU devices, and data is collected through a simple and stable 485 method without interfering with the normal working logic of the fusion terminal. The current, voltage and other data of multiple devices in the substation are monitored in real time, and the threshold is set to achieve seamless switching of the main and standby transformers, which can share the load pressure of a single transformer and increase its lifespan, and solve the problem of single-point failure of the transformer.

[0013] In the utility model, the online monitoring data can be obtained not only from the fusion terminal, but also through the 485 method. The data acquisition method is simple and real-time switching can be realized. At the same time, the status of the transformer is fed back to the main station in real time through the fusion terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 The present invention is a schematic structural diagram of a transformer main-standby switching system in a transformer substation according to an embodiment of the present invention.

[0016] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0019] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] See also Figure 1 According to one aspect of the utility model, the utility model provides a main-standby switching system for transformers in a substation, wherein the main-standby switching system for transformers in a substation comprises: a main transformer, a standby transformer, a busbar circuit breaker, a first circuit breaker, a second circuit breaker, a fusion terminal, a first LTU device, and a second LTU device; the first circuit breaker is arranged at the outlet end of the main transformer, and the second circuit breaker is arranged at the outlet end of the standby transformer; the main transformer is respectively connected to the fusion terminal and the busbar circuit breaker through the first circuit breaker; the fusion terminal is respectively connected to the first LTU device, the second LTU device, the busbar circuit breaker and the second circuit breaker; the first LTU device and the second LTU device are connected to the second circuit breaker.

[0021] Specifically, in this embodiment, open-type current / voltage transformers are provided on the outgoing line sides of the bus tie circuit breaker, the first circuit breaker and the second circuit breaker.

[0022] Specifically, in this embodiment, the fusion terminal collects the exchange data of the bus tie circuit breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device through the RS485 bus.

[0023] Specifically, in this embodiment, the transformer active / standby switching system in the substation further includes a power supply device, which is respectively connected to the bus tie breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device.

[0024] Specifically, in this embodiment, the power supply device is an uninterruptible power supply device.

[0025] Specifically, in this embodiment, the switching method of the transformer main and standby switching system in the substation area includes the following steps:

[0026] S1. Install the device, read the device and bind the measurement point number;

[0027] S2. Start the timer to read the exchange data of each device, including voltage and current data; the fusion terminal performs RS-485 polling every 10 seconds and repeats it 2-3 times to ensure the accuracy of the data;

[0028] S3, monitoring the status of the main transformer, and switching and starting the main / standby transformer according to the exchange data;

[0029] If the main transformer fails, the main transformer is switched to the standby transformer, the first circuit breaker is opened, and the bus tie circuit breaker is closed, thereby completing the switch from the main transformer to the standby transformer;

[0030] If the main transformer returns to normal, the standby transformer is switched to the main transformer, the bus tie circuit breaker is opened, and the first circuit breaker is closed, thereby completing the switch from the standby transformer to the main transformer;

[0031] If the standby transformer fails, it will actively switch to the main transformer, open the second circuit breaker, and close the bus tie circuit breaker, thus completing the switch from the standby transformer to the main transformer;

[0032] If the standby transformer returns to normal, it will actively switch to the standby transformer, open the bus tie circuit breaker, and close the second circuit breaker, thereby completing the switch from the main transformer to the standby transformer.

[0033] Specifically, in this embodiment, the data collected from the first LTU device and the second LTU device also include A phase voltage, B phase voltage, C phase voltage, A phase current, B phase current, C phase current, A phase active power, B phase active power, C phase active power, total active power, A phase apparent power, B phase apparent power, C phase apparent power and total apparent power; the utility model does not make specific limitations and can be set according to needs.

[0034] Specifically, in this embodiment, the data obtained from the main circuit breaker, the first circuit breaker and the second circuit breaker also include phase A voltage, phase B voltage, phase C voltage, phase A current, phase B current, phase C current, maximum apparent power within 10 minutes and switch status; the utility model does not make specific limitations and can be set according to needs.

[0035] Specifically, in this embodiment, the data obtained from the fusion terminal also includes phase A voltage, phase B voltage, phase C voltage, phase A current, phase B current, phase C current and input quantity, etc.; the utility model does not make specific limitations and can be set according to needs.

[0036] Specifically, in this embodiment, before step S1, it also includes: initializing the device, performing log initialization configuration according to the log configuration file, reading the APP configuration file, and forming configuration information.

[0037] Specifically, in this embodiment, when the main transformer and the standby transformer are out of power, the three-phase voltage of the fusion terminal body or the second LTU device is out of voltage, and the data of relevant equipment are collected to determine whether the main transformer or the standby transformer is out of power; the first circuit breaker is connected to the first remote signal of the fusion terminal, and the first circuit breaker is monitored through the first remote signal; the first circuit breaker is connected to the second remote signal of the fusion terminal, and the second circuit breaker is monitored through the second remote signal; the hard pressure plate is connected to the fourth remote signal of the fusion terminal, and the standby transformer is started through the fourth remote signal; in order to reduce the risks brought by the collection errors, in the utility model, the voltage below 10V is the voltage loss disconnection state, and 176V and above is the power restoration closing state; the current below 0.01A is the current loss state, and 0 .1A and above is the recurrent state, where the threshold is configurable; when the main transformer takes over the standby transformer, whether the taking-over end is capable of taking over the taken-over end, calculate the sum of the output currents S1 of the first circuit breaker and the second circuit breaker. When the main transformer takes over the standby transformer, S1 should be less than 0.8*the input current value of the second circuit breaker. When the standby transformer takes over the main transformer, S1 should be less than 0.8*the input current value of the first circuit breaker. The input current takes the maximum current value recorded 10 minutes before the power outage, and the output current takes the real-time value. Of course, you can also consider calculating the sum of the maximum apparent power of the main and standby sides 10 minutes before the power outage and comparing it with the average apparent power of the taking-over end. In either case, the power is monitored later, and once an overload occurs, the port should be taken over immediately.

[0038] Specifically, in the present embodiment, in step S3, when the main transformer fails, the control steps are specifically: determining whether the main transformer reaches the power outage condition;

[0039] If yes, the first circuit breaker is opened, the waiting time is T, and the data is read; it is determined whether the opening of the first circuit breaker is successful, if yes, the bus tie circuit breaker is closed, the waiting time is T, and it is determined whether the bus tie circuit breaker is closed, if yes, the main transformer is switched to the standby transformer; otherwise, the first circuit breaker and / or bus tie circuit breaker cannot be closed and / or the opening state is reported to the master station;

[0040] The main transformer reaches the power outage condition specifically when:

[0041] The fusion terminal reads that the switch state of the first circuit breaker is in the open state, the incoming and outgoing voltages of the first circuit breaker are less than or equal to 10V, that is, the voltage loss disconnection state, the incoming or outgoing current of the first circuit breaker is less than or equal to 0.01A, that is, the current loss state, the incoming voltage of the bus tie circuit breaker is less than or equal to 10V, the incoming current of the bus tie circuit breaker is less than or equal to 0.01A, the outgoing voltage of the second circuit breaker is greater than or equal to 176V, that is, the power restoration closing state, the outgoing current of the second circuit breaker is greater than or equal to 0.1A, the hard pressure plate is in the closed state, and the sum of the outgoing currents of the first circuit breaker and the second circuit breaker is less than or equal to 0.8*the input current value of the second circuit breaker;

[0042] The determination of whether the bus tie circuit breaker is closed is specifically as follows:

[0043] The fusion terminal obtains that the switch status of the main bus circuit breaker is in the closed state, the incoming and outgoing voltages of the second circuit breaker are 176-264V, the incoming and outgoing current range of the second circuit breaker is 0.1-the input current value of the second circuit breaker, the incoming voltage of the main bus circuit breaker is 176-264V, the incoming current range of the main bus circuit breaker is 0.1-the incoming current value of the main bus circuit breaker, the outgoing voltage of the first circuit breaker is 176-264V, the on-off status of the hard pressure plate is in the closed state, and the output current of the first circuit breaker is less than or equal to 0.01V, then the main bus circuit breaker is in the closed state.

[0044] Specifically, in this embodiment, in step S3, when a fault occurs in the standby transformer, the control steps are specifically as follows:

[0045] Determine whether the main transformer has reached the reset condition, if not, further determine whether the standby transformer has reached the power outage condition;

[0046] If yes, the second circuit breaker is opened, the waiting time is T, and the data is read; it is determined whether the second circuit breaker is opened successfully, if yes, the bus tie circuit breaker is closed, the waiting time is T, and it is determined whether the bus tie circuit breaker is closed, if yes, the switching from the standby transformer to the main transformer is completed; otherwise, the unopenable and / or closed status of the second circuit breaker and / or bus tie circuit breaker is reported to the master station;

[0047] The power outage conditions for the standby transformer are as follows:

[0048] The fusion terminal reads that the switch state of the second circuit breaker is in the on state, the incoming and outgoing line voltages of the second circuit breaker are less than or equal to 10V, that is, the voltage loss disconnection state, the incoming or outgoing line current of the second circuit breaker is less than or equal to 0.01A, that is, the current loss state, the outgoing line voltage of the bus tie circuit breaker is less than or equal to 10V, the outgoing line current of the bus tie circuit breaker is less than or equal to 0.01A, the outgoing line voltage of the first circuit breaker is greater than or equal to 176V, that is, the power restoration closing state, the outgoing line current of the first circuit breaker is greater than or equal to 0.1A, and the sum of the outgoing line currents of the first circuit breaker and the second circuit breaker is less than or equal to 0.8*the input current value of the first circuit breaker;

[0049] The determination of whether the bus tie circuit breaker is closed is specifically as follows:

[0050] The fusion terminal obtains that the switch status of the main bus circuit breaker is in the closed state, the incoming and outgoing voltages of the first circuit breaker are 176-264V, the incoming and outgoing current ranges of the first circuit breaker are 0.1-the input current value of the second circuit breaker, the outgoing voltage of the main bus circuit breaker is 176-264V, the outgoing current range of the main bus circuit breaker is 0.1-the incoming current value of the main bus circuit breaker, the outgoing voltage of the second circuit breaker is 176-264V, the hard pressure plate on-off state is in the closed state, the output current of the second circuit breaker is less than or equal to 0.01V, and the main bus circuit breaker is in the closed state.

[0051] Specifically, in this embodiment, when the main transformer or the standby transformer is powered on, the trigger condition is that when the low-voltage standby automatic re-transfer has been taken over, the three-phase voltage of the first circuit breaker or the second circuit breaker incoming line is 210V-264V, and relevant equipment is collected for analysis and judgment, and the main transformer, also known as the main transformer, is powered on, and the standby transformer, also known as the standby transformer, is powered on.

[0052] Specifically, in this embodiment, in step S3, when the main transformer returns to normal, the control steps are specifically as follows:

[0053] Determine whether the main transformer has reached the power-off condition, and if not, further determine whether the main transformer has reached the power-on condition;

[0054] If so, the bus tie circuit breaker is opened, the waiting time is T, and the data is read. At the same time, the fusion terminal reports the main transformer power restoration information and the operation information of preparing to switch the circuit breaker to realize the main transformer power supply alone to the main station; it is judged whether the bus tie circuit breaker is opened successfully. If so, the first circuit breaker is closed, and the waiting time is T. It is judged whether the first circuit breaker is closed. If so, the standby transformer is switched to the main transformer; otherwise, the first circuit breaker and / or the bus tie circuit breaker cannot be closed and / or the opening state is reported to the main station;

[0055] After the first circuit breaker is closed, the process also includes: waiting for a time T, reading the data of each device to confirm whether the status is normal, and if normal, confirming the first circuit breaker and the gate, switching on and off the circuit breaker to realize the safety of the main transformer operating alone, and the standby transformer is in a state of waiting to be switched;

[0056] The specific conditions for restoring power to the main transformer are:

[0057] The fusion terminal reads that the switch state of the bus tie circuit breaker is in the closed state, the switch state of the first circuit breaker is in the open state, the incoming and outgoing line voltages of the first circuit breaker are 210-264V, the incoming and outgoing line currents of the first circuit breaker are less than or equal to 0.1A, the incoming line voltage of the bus tie circuit breaker is 210-264V, the incoming line current of the bus tie circuit breaker is greater than or equal to 0.1A, the outgoing line voltage of the second circuit breaker is 210-264V, and the outgoing line current of the second circuit breaker is greater than or equal to 0.1A;

[0058] The determination of whether the bus tie circuit breaker is opened successfully is specifically as follows:

[0059] The switch state of the bus tie circuit breaker is in the on state, the incoming voltage of the first circuit breaker is 210-264V, the outgoing voltage of the first circuit breaker is less than or equal to 10V, the incoming current of the first circuit breaker is less than or equal to 0.01A, the outgoing current of the first circuit breaker is less than or equal to 0.1V, the outgoing voltage of the bus tie circuit breaker is 210-264V, the outgoing current of the bus tie circuit breaker is less than or equal to 0.01A, the on-off state of the hard pressure plate obtained by the fusion terminal is in the off state, the outgoing voltage of the second circuit breaker is 210-264V, and the outgoing current of the second circuit breaker is greater than or equal to 0.1A;

[0060] The reading of each device data to confirm whether the status is normal is specifically as follows:

[0061] The switch state of the first circuit breaker is closed, the switch state of the main bus circuit breaker is open, the incoming and outgoing line voltages of the first circuit breaker are 210-264V, the incoming and outgoing line currents of the first circuit breaker are greater than or equal to 0.1A, the incoming line voltage of the main bus circuit breaker is 210-264V, the outgoing line voltage of the main bus circuit breaker is 176-264V, the fusion terminal reads the on-off state of the hard pressure plate as closed, and the incoming and outgoing line currents of the main bus circuit breaker are less than or equal to 0.01A.

[0062] Specifically, in this embodiment, in step S3, the control steps when the standby transformer returns to normal are specifically as follows:

[0063] Determine whether the standby transformer has reached the power-off condition, and if not, further determine whether the standby transformer has reached the power-on condition;

[0064] If so, the bus tie circuit breaker is opened, and the waiting time is T, and the data is read. At the same time, the fusion terminal reports the power restoration information of the main and standby transformers and the information of preparing to switch the circuit breaker to realize the independent power supply operation of the standby transformer to the main station; it is judged whether the bus tie circuit breaker is opened successfully. If so, the second circuit breaker is closed, and the waiting time is T. It is judged whether the second circuit breaker is closed. If so, the switching from the main transformer to the standby transformer is completed; otherwise, the bus tie circuit breaker and / or the second circuit breaker cannot be opened and / or closed to the main station;

[0065] The specific conditions for restoring power to the main transformer are:

[0066] The fusion terminal reads that the switch state of the main bus circuit breaker is in the closed state, the switch state of the second circuit breaker is in the open state, the incoming and outgoing line voltages of the second circuit breaker are 210-264V, the incoming and outgoing line currents of the second circuit breaker are less than or equal to 0.1A, the outgoing line voltage of the main bus circuit breaker is 210-264V, the outgoing line current of the main bus circuit breaker is greater than or equal to 0.1A, the outgoing line voltage of the first circuit breaker is 210-264V, and the outgoing line current of the first circuit breaker is greater than or equal to 0.1A.

[0067] After the second circuit breaker is closed, the process also includes: waiting for a time T, reading the data of each device to confirm whether the status is normal, and if normal, confirming the second circuit breaker and the gate, switching on and off the circuit breaker to realize the safety of the standby transformer operating independently, and the main transformer is in a state to be switched on;

[0068] The determination of whether the bus tie circuit breaker is opened successfully is specifically as follows:

[0069] The switch state of the bus tie circuit breaker is in the on state, the incoming voltage of the second circuit breaker is 210-264V, the outgoing voltage of the second circuit breaker is less than or equal to 10V, the incoming current of the second circuit breaker is less than or equal to 0.01A, the outgoing current of the second circuit breaker is less than or equal to 0.1V, the incoming voltage of the bus tie circuit breaker is 210-264V, the incoming current of the bus tie circuit breaker is less than or equal to 0.01A, the on-off state of the hard pressure plate obtained by the fusion terminal is in the off state, the outgoing voltage of the first circuit breaker is 210-264V, and the outgoing current of the first circuit breaker is greater than or equal to 0.1A;

[0070] The reading of each device data to confirm whether the status is normal is specifically as follows:

[0071] The switch state of the second circuit breaker is closed, the switch state of the main bus circuit breaker is open, the incoming and outgoing line voltages of the second circuit breaker are 210-264V, the incoming and outgoing line currents of the second circuit breaker are greater than or equal to 0.1A, the incoming line voltage of the main bus circuit breaker is 210-264V, the outgoing line voltage of the main bus circuit breaker is 176-264V, and the fusion terminal reads the hard pressure plate on-off state as closed, and the incoming and outgoing line currents of the main bus circuit breaker are less than or equal to 0.01A.

[0072] Specifically, in this embodiment, in the process of judging the power outage status and power restoration status of the main transformer and the standby transformer by levels, the topological layer structure of the substation can be quickly identified, and the fault location in the substation can be quickly located, reducing the problem of multiple or false alarms of fault time in the low-voltage substation; under normal circumstances, multiple transformers are deployed in the low-voltage substation, which supply power to each other independently without interfering with each other, and can take over in both directions in the event of a fault, which can not only share the load pressure of the transformer and extend the life of the transformer, but also solve the single-point failure of the transformer, the power outage fault disaster recovery and zero power outage purpose, and minimize the power outage time; after the substation in the low-voltage substation takes over, it can monitor the power grid data in real time. Once the emergency repair is completed, it can automatically solve the takeover and restore the independent power supply state without human intervention.

[0073] Specifically, in this embodiment, by configuring low-cost circuit breakers and LTU devices in the substation and collecting data through RS-485, power outage fault recovery can be achieved at low cost; the internal input and output voltage, current, power and other power grid data are monitored in real time through the fusion terminal, real-time online calculation is performed, and adjustable parameter thresholds are configured to accurately monitor specific substations and seamlessly control the switching of circuit breakers; at the same time, through the preset of multiple communication methods, the status of equipment in the substation, whether it is switched, and the opening and closing status of the circuit breaker can be pushed to the main station or customer in real time, so that the operating personnel can repair the fault in time; and it can be extended to multiple substations to achieve the goal of power outage and zero power outage in distributed transformer clusters.

[0074] In order to facilitate the understanding of the relevant terms of this utility model, an explanation is given here:

[0075] LTU, intelligent low voltage shunt monitoring unit.

[0076] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transformer main and standby switching system in a transformer area, characterized in that: include: A main transformer, a standby transformer, a busbar circuit breaker, a first circuit breaker, a second circuit breaker, a fusion terminal, a first LTU device, and a second LTU device; the first circuit breaker is arranged at the outgoing terminal of the main transformer, and the second circuit breaker is arranged at the outgoing terminal of the standby transformer; the main transformer is respectively connected to the fusion terminal and the busbar circuit breaker through the first circuit breaker; the fusion terminal is respectively connected to the first LTU device, the second LTU device, the busbar circuit breaker and the second circuit breaker; the first LTU device and the second LTU device are connected to the second circuit breaker.

2. A transformer main-standby switching system in a transformer substation according to claim 1, characterized in that: The outgoing line sides of the bus tie circuit breaker, the first circuit breaker and the second circuit breaker are provided with open-type current / voltage transformers.

3. A transformer main-standby switching system in a transformer substation according to any one of claims 1-2, characterized in that: The fusion terminal collects the exchange data of the bus tie circuit breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device through the RS485 bus.

4. A transformer main-standby switching system in a transformer substation according to any one of claims 1-2, characterized in that: The transformer active / standby switching system in the substation area also includes a power supply device, which is respectively connected to the bus tie circuit breaker, the first circuit breaker, the second circuit breaker, the first LTU device and the second LTU device.

5. A transformer main-standby switching system in a transformer area according to claim 4, characterized in that: The power supply device is an uninterruptible power supply device.

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