CN113162030B - Spare power automatic switching load sharing method, device and computer equipment based on transformer substation - Google Patents
Spare power automatic switching load sharing method, device and computer equipment based on transformer substation Download PDFInfo
- Publication number
- CN113162030B CN113162030B CN202110351166.8A CN202110351166A CN113162030B CN 113162030 B CN113162030 B CN 113162030B CN 202110351166 A CN202110351166 A CN 202110351166A CN 113162030 B CN113162030 B CN 113162030B
- Authority
- CN
- China
- Prior art keywords
- low
- main transformer
- voltage
- bus
- voltage side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application relates to a spare power automatic switching load sharing method, device, computer equipment and storage medium based on a transformer substation. The method comprises the following steps: collecting the power value of the second main transformer; checking whether the power value of the second main transformer is larger than an overload power fixed value; and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load. The load sharing flexibility can be improved by adopting the method.
Description
Technical Field
The application relates to the technical field of load sharing of automatic backup switching devices, in particular to a method, a device, computer equipment and a storage medium for load sharing of automatic backup switching based on a transformer substation.
Background
With the development of the load sharing technology of the spare power automatic switching device, in order to avoid the problem that the main transformer is overloaded due to the action of the device in the process that the low-voltage side spare power automatic switching device is put into the standby power to restore to normal power supply after the working power supply is disconnected, the spare power automatic switching load sharing technology based on the transformer substation is developed.
In the traditional technology, the load sharing logic is added into the low-voltage side (for example, 10 KV) spare power automatic switching device, so that overload of a transformer can be effectively avoided, and the power supply reliability is improved. The long-time overload operation of the transformer can cause the temperature rise, the insulation performance is reduced, and the service life of the transformer is influenced. Before operation, in order to avoid overload operation of each main transformer, the low-voltage side spare power automatic switching device increases load sharing logic, and the spare power automatic switching charging condition increases load sharing pressing plate input.
However, in the traditional method, the load sharing logic is single, the device does not consider the load carried by the main transformer to force the load sharing after the pressing plate is put into, and the flexibility is low.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, and a storage medium for load sharing of a backup power automatic switching device based on a substation, which can improve load sharing flexibility.
A spare power automatic switching load sharing method based on a transformer substation comprises the following steps:
the primary structure of the transformer substation comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, wherein a first main transformer low switch and a first main transformer are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer low switch and the first main transformer are connected in series; a second sectionalizer is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with the low-voltage side third bus in series; a second main transformer low-voltage switch is connected between the second main transformer and the low-voltage side second bus, a third main transformer low-voltage switch is connected between the second main transformer and the low-voltage side third bus, a first sectionalizing switch is connected between the low-voltage side third bus and the low-voltage side fourth bus, a third main transformer is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer low-voltage switch is connected between the third main transformer and the low-voltage side fourth bus; the method comprises the following steps:
Collecting the power value of the second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load.
In one embodiment, when the power value of the second main transformer is greater than the overload power fixed value, waiting for a delay fixed value duration to confirm spare power automatic switching load sharing includes:
detecting that the power value of the second main transformer is larger than the overload power fixed value;
and waiting for the time delay fixed value duration, when the second main transformer is determined to meet the charging operation condition of load sharing, switching off the first main transformer low-voltage switch, and when the first main transformer low-voltage switch is confirmed to be switched off and in a split state, switching on the first sectioning switch in a time delay mode, and when the first sectioning switch is confirmed to be in a closed state, switching on the second sectioning switch in a time delay mode.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, it is determined that no backup automatic switching load sharing is performed.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, the determining that the spare power automatic switching load sharing is not performed includes:
Detecting that the power value of the second main transformer is not larger than the overload power fixed value;
when the second main transformer meets the charging operation condition of no load sharing, the first main transformer low-voltage switch is turned off, and when the first main transformer low-voltage switch is confirmed to be turned off and in a split state, the second section switch is put into delay.
In one embodiment, before checking whether the power value of the second main transformer is greater than the overload power fixed value, the method further includes:
detecting whether a first bus at the low voltage side loses voltage or not, and whether a first main transformer low-voltage switch has no current or not;
and when the first bus at the low voltage side is determined to be out of voltage and the first main transformer becomes low-voltage switch to have no current, executing the step of checking whether the power value of the second main transformer is larger than the overload power fixed value.
In one embodiment, the method further comprises:
collecting the voltage of a first bus at the low voltage side to obtain a corresponding first voltage amplitude and a first vector angle, and collecting the voltage of a second bus at the low voltage side to obtain a corresponding second voltage amplitude and a second vector angle;
calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value;
Checking whether the angle vector difference is zero or not, and checking whether the amplitude vector difference is larger than a difference threshold;
when the angle vector difference value is zero and the amplitude vector difference value is not greater than a difference value threshold value, the first main transformer and the second main transformer are determined to belong to the same power supply system, the low-voltage side first bus and the low-voltage side second bus are in loop closing operation, and the operation is continued according to spare power automatic switching load equipartition.
In one embodiment, when the angle vector difference is not zero and the amplitude vector difference is greater than a difference threshold, it is determined that the first main transformer and the second main transformer do not belong to the same power system, the second main transformer low-voltage switch is tripped, and it is determined that spare power automatic switching load sharing is not executed.
A backup power automatic switching load sharing device based on a transformer substation, the device comprising:
the power value acquisition module is used for acquiring the power value of the second main transformer;
the power value checking module is used for checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
and the load sharing module is used for waiting for the delay fixed value duration and confirming the spare power automatic switching load sharing when the power value of the second main transformer is larger than the overload power fixed value.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
collecting the power value of the second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
collecting the power value of the second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load.
According to the method, the device, the computer equipment and the storage medium for equipartition of the spare power automatic switching load based on the transformer substation, when the upper power supply system of the first main transformer or the third main transformer fails, whether the power value of the second main transformer is larger than the overload power value is checked, and when the power value of the second main transformer is larger than the overload power value, the equipartition of the load is confirmed, and the operation according to the equipartition of the load is performed. The load sharing method has the advantages that the load sharing method does not need to manually throw the back-off plate, and automatically judges whether load sharing is carried out according to the power value of the second main transformer, so that the load sharing method optimizes the load function of the low-voltage side spare power automatic switching device by increasing the electrical quantity criterion, realizes the load sharing automatic selection function of the spare power automatic switching device, is favorable for realizing the real-time automatic control and analysis decision function of the integrated transformer substation, and can improve the load sharing flexibility.
Drawings
FIG. 1 is an application environment diagram of a backup power automatic switching load sharing method based on a transformer substation in one embodiment;
FIG. 2 is a schematic diagram of the structure and wiring of a high voltage substation according to one embodiment;
FIG. 3 is a diagram illustrating an operation state of load sharing of the automatic backup power switching in an embodiment;
FIG. 4 is a diagram illustrating an operation state of spare power automatic switching without load sharing in another embodiment;
fig. 5 is a schematic flow chart of backup power automatic switching load sharing based on a transformer substation in one embodiment;
fig. 6 is a schematic flow chart of backup power automatic switching load sharing based on a transformer substation in another embodiment;
FIG. 7 is a block diagram of a backup power automatic switching load sharing device based on a transformer substation in one embodiment;
fig. 8 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The spare power automatic switching load sharing method based on the transformer substation can be applied to an application environment shown in fig. 1. The automatic switching device 10 includes a data acquisition module 102 and a load sharing unit 104, where the data acquisition module 102 is configured to acquire a power value of the second main transformer, voltages and currents on the low-voltage side buses, and the load sharing unit 104 is configured to determine whether to perform automatic switching load sharing according to a verification result.
In general, the structure and wiring schematic diagram of a high-voltage (for example, 110KV on the high-voltage side and 10KV on the low-voltage side) transformer substation are shown in fig. 2, and the diagram only illustrates the structures and connection relationships, so that the on-off state of a specific circuit is not shown. The primary structure of the transformer substation comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, wherein a first main transformer low switch 501 and a first main transformer (# 1) are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer low switch 501 and the first main transformer are connected in series; a second sectioning switch 521 is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer (# 2) is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected in series with the low-voltage side third bus; a second main transformer low-voltage switch 502 is connected between the second main transformer and the low-voltage side second bus, a third main transformer low-voltage switch 503 is connected between the second main transformer and the low-voltage side third bus, and a first sectionalizing switch 532 is connected between the low-voltage side third bus and the low-voltage side fourth bus. A third main transformer (# 3) is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer low switch 504 is connected between the third main transformer and the low-voltage side fourth bus.
The running state of spare power automatic switching load sharing is shown in fig. 3, wherein a small black rectangle indicates that the switch is in a closed state, and a small white rectangle indicates that the switch is in a split state. It can be seen that the first main transformer low switch 501 is in the split state, the second main transformer low switch 502, the third main transformer low switch 503 and the fourth main transformer low switch 504 are in the closed state, and the first sectionalizing switch 532 and the second sectionalizing switch 521 are in the closed state. When the action logic of the spare power automatic switching load sharing is specifically executed, the first main transformer low-voltage switch 501 is firstly tripped, the first main transformer low-voltage switch 501 is confirmed to be in a split state, then the second sectionalizing switch 521 is put in a delayed state, and the second sectionalizing switch 521 is confirmed to be in a combined state, then the first sectionalizing switch 532 is put in a delayed state. Before executing a specific spare power automatic switching load sharing action, it is checked whether the following charging operation conditions are met, that is, whether four low-voltage side buses (a low-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus, and a low-voltage side fourth bus) are all three-phase voltage-possessed, and four main transformer low-voltage switches (a first main transformer low-voltage switch 501, a second main transformer low-voltage switch 502, a third main transformer low-voltage switch 503, and a fourth main transformer low-voltage switch 504) are in a closed state. When the above conditions are satisfied at the same time, the corresponding action logic is executed.
The running state of spare power automatic switching without load sharing is shown in fig. 4, wherein a small black rectangle indicates that the switch is in a closed state, and a small white rectangle indicates that the switch is in a split state. The first main transformer low switch 501 is in a split state, the second main transformer low switch 502, the third main transformer low switch 503 and the fourth main transformer low switch 504 are in a closed state, the first sectionalizing switch 532 is in a split state, and the second sectionalizing switch 521 is in a closed state. When the action logic of the spare power automatic switching load sharing is specifically executed, the first main transformer low-voltage switch 501 is firstly tripped, and after confirming that the first main transformer low-voltage switch 501 is in the split position, the second section switch 521 is put in a delay mode. Before specific actions are executed, it is checked whether the following charging operation conditions are satisfied at the same time, that is, whether the low-voltage side first bus and the low-voltage side second bus are both three-phase voltage, the first main transformer low switch 501, the second main transformer low switch 502 and the second section switch 521 are all in a closed state, and the standby power automatic switching function is put into operation. When the above conditions are satisfied at the same time, the corresponding action logic is executed.
In one embodiment, as shown in fig. 5, a method for equipartition of spare power automatic switching loads based on a transformer substation is provided, and the method is applied to the terminal in fig. 1 for illustration, and includes the following steps:
Step S502, the power value of the second main transformer is collected.
Step S504, checking whether the power value of the second main transformer is larger than the overload power fixed value.
When the power value of the second main transformer is larger than the overload power fixed value, executing step S506, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load; when the power value of the second main transformer is not greater than the overload power value, step S508 is executed to confirm that the spare power automatic switching load sharing is not executed.
The power value may be the maximum power value of the second main transformer, or may be the effective power value of the second main transformer (the effective power value is the effective value of the maximum power value), and the process of collecting the power value is real-time and continuous.
The overload power fixed value can be the maximum power value which can be born by the second main transformer, and the power value of the second main transformer which corresponds to the verification is the maximum power value of the second main transformer; the overload power fixed value can also be the maximum effective power value which can be born by the second main transformer, and the power value of the second main transformer which corresponds to the verification is the maximum effective power value of the second main transformer. The delay fixed value is the length of delay waiting time, and can be set in the spare power automatic switching device.
Specifically, taking the first main transformer as an example (the third main transformer is the same), if the upper power supply system fails, the first main transformer becomes low-voltage switch is tripped, and if the first main transformer is executed according to the spare power automatic switching mode without the equipartition operation mode, the second main transformer is provided with a low-voltage side first bus, a low-voltage side second bus and a low-voltage side third bus; when the first bus, the second bus, the third bus and the fourth bus are provided together by the second main transformer and the third main transformer when the automatic switching load sharing operation mode is executed. The load supply capacity of the second main transformer is obviously reduced in comparison with the load sharing mode, and the power value of the second main transformer is required to be relatively small. Therefore, when the power value of the second main transformer is larger than the overload power fixed value, after waiting for the set delay fixed value time length, the standby automatic switching load sharing is realized, and the overload of the second main transformer caused by the action of the standby automatic switching device is prevented. Before equipartition of the spare power automatic switching device load, an electrical quantity criterion (whether the power value of the second main transformer is larger than the overload power fixed value) is added in advance to optimize the load function of the spare power automatic switching device on the low voltage side. When the power value of the second main transformer is not larger than the overload power value, the fact that the spare power automatic switching load sharing is not executed is confirmed, and when the spare power automatic switching sharing is not executed, the second main transformer is in an operation state under the general condition that the overload condition does not occur.
In the spare power automatic switching load sharing method based on the transformer substation, when the upper power supply system of the first main transformer or the third main transformer fails, whether the power value of the second main transformer is larger than the overload power value is checked, and when the power value of the second main transformer is larger than the overload power value, load sharing is confirmed, and the spare power automatic switching load sharing method operates according to the load sharing. The load sharing method has the advantages that the load sharing method does not need to manually throw the back-off plate, and automatically judges whether load sharing is carried out according to the power value of the second main transformer, so that the load sharing method optimizes the load function of the low-voltage side spare power automatic switching device by increasing the electrical quantity criterion, realizes the load sharing automatic selection function of the spare power automatic switching device, is favorable for realizing the real-time automatic control and analysis decision function of the integrated transformer substation, and can improve the load sharing flexibility.
In one embodiment, when the power value of the second main transformer is greater than the overload power fixed value, waiting for the delay fixed value duration to confirm the spare power automatic switching load sharing includes:
detecting that the power value of the second main transformer is larger than the overload power fixed value; and waiting for the time delay fixed value duration, when the second main transformer is determined to meet the charging operation condition of load sharing, switching off the first main transformer low-voltage switch, and when the first main transformer low-voltage switch is confirmed to be switched off and in a split state, switching on the first sectioning switch in a time delay mode, and when the first sectioning switch is confirmed to be in a closed state, switching on the second sectioning switch in a time delay mode.
When the spare power automatic switching device confirms that the load is uniform, a state diagram of the switching positions of the switches is shown in fig. 3. Before a specific spare power automatic switching load sharing action is executed, whether the following charging operation conditions are met or not is checked, namely, three phases of four buses at the low voltage side are all in voltage, and four main transformer low-voltage switches are in a combined state. When the above conditions are satisfied at the same time, the corresponding action logic is executed. After the charging operation condition and the operation condition are satisfied, the first main transformer low-voltage switch 501 is turned off by the delay time, and when the first main transformer low-voltage switch 501 is confirmed to be turned off and in the split state, the first split switch 532 is turned on by the delay time, and when the first split switch 532 is confirmed to be in the closed state, the second split switch 521 is turned on by the delay time.
In this embodiment, the first main transformer low-voltage switch is turned off by delay, then the first sectionalizing switch is turned on by delay, and then the second sectionalizing switch is turned on by delay, so that the spare power automatic switching device realizes load sharing.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, confirming that the spare power automatic switching load sharing is not performed includes:
detecting that the power value of the second main transformer is not larger than the overload power fixed value;
when the second main transformer meets the charging operation condition of no-load sharing, the first main transformer low-voltage switch is turned off, and when the first main transformer low-voltage switch is confirmed to be turned off and in a split state, the second section switch is put into delay.
When the spare power automatic switching device confirms that the load is not uniform, a state diagram of the switching positions of the switches is shown in fig. 4. Before specific actions are executed, it is checked whether the following charging operation conditions are satisfied at the same time, that is, whether the low-voltage side first bus and the low-voltage side second bus are both three-phase voltage, the first main transformer low switch 501, the second main transformer low switch 502 and the second section switch 521 are all in a closed state, and the standby power automatic switching function is put into operation. When the above conditions are satisfied at the same time, the corresponding action logic is executed. When these charging conditions and operating conditions are satisfied at the same time, the first main transformer low-voltage switch 501 is turned off by a delay time, and after confirming that the first main transformer low-voltage switch 501 is turned on and off by the delay time, the second section switch 521 is turned on and off.
In this embodiment, when the first main transformer low-voltage switch is confirmed to be in the split state by tripping the first main transformer low-voltage switch, the second split switch is put into delay, so that the spare power automatic switching is in an operation mode of no-load sharing.
In one embodiment, before checking whether the power value of the second main transformer is greater than the overload power fixed value, the method further comprises:
detecting whether a first bus at the low voltage side loses voltage or not, and whether a first main transformer low-voltage switch has no current or not;
And when the first bus at the low voltage side is determined to be out of voltage and the first main transformer becomes low-voltage switch to have no current, executing the step of checking whether the power value of the second main transformer is larger than the overload power fixed value.
The voltage and the current of the low-voltage side bus are measured by the related device through the contact, and if the contact fails, the measured voltage and current values are not equivalent to the true values. In this case, the voltage loss of the low-voltage side first bus bar does not necessarily represent that the first main transformer low-voltage switch 501 is not necessarily currentless, and conversely, the first main transformer low-voltage switch 501 is not necessarily currentless nor does it represent that the low-voltage side first bus bar is not necessarily voltage-lost. Therefore, the verification result needs to simultaneously meet the conditions that the first bus at the low voltage side loses voltage and the first main transformer low-voltage switch has no current, and at the moment, the fault of the upper power supply system of the first main transformer can be determined, and the first main transformer low-voltage switch is in a split state.
In this embodiment, by detecting, when it is determined that the low-voltage side first bus is out of voltage and the first main transformer becomes low-voltage switch has no current, the power checking step of the second main transformer is executed, so that the spare power automatic switching device can be prevented from being switched to the load sharing operation mode by mistake when the upper power supply system of the first main transformer or the third main transformer does not actually fail.
In one embodiment, the backup power automatic switching load sharing method based on the transformer substation further comprises the following steps:
and acquiring the voltage of a first bus at the low voltage side to obtain a corresponding first voltage amplitude and a first vector angle, and acquiring the voltage of a second bus at the low voltage side to obtain a corresponding second voltage amplitude and a second vector angle.
The voltage, the current and the like are vectors, the first voltage amplitude is the absolute value of the voltage of the first bus at the low voltage side, and the second voltage amplitude is the absolute value of the voltage of the second bus at the low voltage side. For example, when the first sectionalizer between the low-voltage side first bus and the low-voltage side second bus is in the split state, the current flows of the low-voltage side first bus and the low-voltage side second bus are consistent, and the current flows from the high-voltage side to the low-voltage side. If the second sectional switch is closed at this time, the second main transformer and the first main transformer are in loop operation, namely, the current flows from the high-voltage side to the first main transformer, and flows to the second main transformer again through the second sectional switch. Therefore, there is a deviation between the angle of the voltage of the low-voltage side first bus and the angle of the voltage of the low-voltage side second bus, and the angle of the first vector corresponds to the low-voltage side first bus and the angle of the second vector corresponds to the low-voltage side second bus. The backup automatic switching device only needs to collect the voltage of the low-voltage side second bus corresponding to the second main transformer and the voltage of the low-voltage side first bus corresponding to the first main transformer for comparison, or the voltage of the low-voltage side third bus and the voltage of the low-voltage side fourth bus for comparison. And determining whether the two sections of buses can perform closed loop operation or not by comparing the amplitude vector difference value and the angle vector difference value.
If the low-voltage side is parallel to the high-voltage side, when the low-voltage bus is looped, if the voltage of the two main transformers on the high-voltage side deviates, circulation is easy to generate, and the overload of the transformer or the burning of equipment can be caused by serious circulation. Namely, when the first bus at the low voltage side and the second bus at the low voltage side are in loop connection, if the voltages at the high voltage sides of the corresponding first main transformer and the second main transformer deviate, the loop current is easy to flow; when the ring is closed between the third bus bar at the low voltage side and the fourth bus bar at the low voltage side, if the corresponding second main transformer and the corresponding third main transformer deviate at the high voltage side, circulation is easy to generate.
And calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value.
Specifically, the formula for calculating the magnitude vector difference is as follows:
U closing ring ＝|U X -U Y |，
Wherein U is Closing ring As magnitude vector difference (absolute form), U X For the first voltage amplitude, U Y Is the second voltage magnitude.
θ Closing ring ＝|θ X -θ Y |，
Wherein θ Closing ring In the form of angle vector difference (absolute value), θ X For a first vector angle, θ Y Is the second vector angle.
Checking whether the angle vector difference is zero or not, and checking whether the amplitude vector difference is larger than a difference threshold value or not; when the angle vector difference value is zero and the amplitude vector difference value is not greater than the difference value threshold value, determining that the first main transformer and the second main transformer belong to the same power supply system, and carrying out loop closing operation on the first bus at the low voltage side and the second bus at the low voltage side, and carrying out equipartition and continuous operation according to spare power automatic switching load; when the angle vector difference value is not zero and the amplitude vector difference value is larger than the difference value threshold value, the first main transformer and the second main transformer are determined not to belong to the same power supply system, the second main transformer low-voltage switch is tripped, and the spare power automatic switching load sharing is determined not to be executed.
The difference threshold is a constant value according to the on-site judgment, but can be set. When the magnitude vector difference is not greater than the difference threshold, the high voltage sides of the first main transformer and the second main transformer are considered to belong to the same power supply system.
Specifically, when the angle vector difference is zero and the amplitude vector difference is not greater than the difference threshold, it is indicated that the high-voltage sides corresponding to the first main transformer and the second main transformer belong to the same power supply system, the high-voltage sides are parallel before the low-voltage sides, and at the moment, the loop closing operation of the first bus on the low-voltage side and the second bus on the low-voltage side cannot cause the circulation problem. At this time, the system can still operate in a spare power automatic switching load sharing mode. If the high-voltage sides corresponding to the first main transformer and the second main transformer are not affiliated to the same power supply system, the low-voltage sides are arranged in parallel before the high-voltage sides, and at the moment, the loop current problem can be caused by the loop closing operation of the first bus on the low-voltage side and the second bus on the low-voltage side. And when the loop closing operation is judged to be impossible, the second main transformer low switch corresponding to the second bus at the low voltage side is tripped.
In this embodiment, by acquiring the amplitude vector difference and the angle vector difference and performing verification analysis on the amplitude vector difference and the angle vector difference, it is determined whether the low-voltage side first bus and the low-voltage side second bus are in loop closing operation, and the spare power automatic switching average-split operation mode is continuously executed, so that the problem that circulation occurs due to the fact that the low-voltage side is parallel before the high-voltage side is avoided. The electrical quantity criterion device for increasing the voltage amplitude and vector angle can automatically judge whether the low-voltage bus can perform loop closing operation. The optimized low-voltage side spare power automatic switching device can autonomously analyze and determine whether load sharing is realized, so that the workload of operation and maintenance personnel is reduced, and meanwhile, the power supply reliability and continuity are improved.
In this embodiment, when the upper power supply system of the first main transformer or the third main transformer fails, by checking whether the power value of the second main transformer is greater than the overload power value, when the power value of the second main transformer is greater than the overload power value, load sharing is confirmed, and the load sharing is operated according to the load sharing. The load sharing method has the advantages that the load sharing method does not need to manually throw the back-off plate, and automatically judges whether load sharing is carried out according to the power value of the second main transformer, so that the load sharing method optimizes the load function of the low-voltage side spare power automatic switching device by increasing the electrical quantity criterion, realizes the load sharing automatic selection function of the spare power automatic switching device, is favorable for realizing the real-time automatic control and analysis decision function of the integrated transformer substation, and can improve the load sharing flexibility.
In one embodiment, the backup automatic switching load sharing method based on the transformer substation comprises the following steps:
step S602, collecting the power value of the second main transformer;
step S604, detecting whether the first bus at the low voltage side loses voltage or not, and whether the first main transformer low-voltage switch has no current or not;
step S606, determining that the first bus at the low voltage side is out of voltage and the first main transformer becomes low-voltage switch without current;
step S608, checking whether the power value of the second main transformer is greater than the overload power fixed value;
When the power value of the second main transformer is larger than the overload power fixed value, executing step S610, waiting for the time delay fixed value duration, and confirming the equipartition of the spare power automatic switching load;
when the power value of the second main transformer is not greater than the overload power value, step S612 is executed to confirm that no spare power automatic switching load sharing is executed.
In this embodiment, when the upper power supply system of the first main transformer or the third main transformer fails, by checking whether the power value of the second main transformer is greater than the overload power value, when the power value of the second main transformer is greater than the overload power value, load sharing is confirmed, and the load sharing is operated according to the load sharing. The load sharing method has the advantages that the load sharing method does not need to manually throw the back-off plate, and automatically judges whether load sharing is carried out according to the power value of the second main transformer, so that the load sharing method optimizes the load function of the low-voltage side spare power automatic switching device by increasing the electrical quantity criterion, realizes the load sharing automatic selection function of the spare power automatic switching device, is favorable for realizing the real-time automatic control and analysis decision function of the integrated transformer substation, and can improve the load sharing flexibility.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a part of the steps in the flowcharts related to the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages performed is not necessarily sequential, but may be performed alternately or alternately with at least a part of the steps or stages in other steps or other steps.
In one embodiment, as shown in fig. 7, there is provided a backup power automatic switching load sharing device based on a transformer substation, including: power value acquisition module 702, power value verification module 704 and load sharing module 706, wherein:
the power value acquisition module 702 is configured to acquire a power value of the second main transformer;
a power value checking module 704, configured to check whether the power value of the second main transformer is greater than an overload power fixed value;
and the load sharing module 706 is configured to wait for a delay fixed value duration to confirm the spare power automatic switching load sharing when the power value of the second main transformer is greater than the overload power fixed value.
In one embodiment, the load sharing module is further configured to, when detecting that the power value of the second main transformer is greater than the overload power fixed value;
and waiting for the time delay fixed value duration, when the second main transformer is determined to meet the charging operation condition of load sharing, switching off the first main transformer low-voltage switch, and when the first main transformer low-voltage switch is confirmed to be switched off and in a split state, switching on the first sectioning switch in a time delay mode, and when the first sectioning switch is confirmed to be in a closed state, switching on the second sectioning switch in a time delay mode.
In one embodiment, the load sharing module is further configured to confirm that the backup power automatic switching load sharing is not performed when the power value of the second main transformer is not greater than the overload power value; wherein, include: detecting that the power value of the second main transformer is not larger than the overload power fixed value; when the second main transformer meets the charging operation condition of no-load sharing, the first main transformer low-voltage switch is turned off, and when the first main transformer low-voltage switch is confirmed to be turned off and in a split state, the second section switch is put into delay.
In one embodiment, the backup power automatic switching load sharing device based on the transformer substation further comprises:
the voltage and current detection module is used for detecting whether the first bus at the low voltage side loses voltage or not, and whether the first main transformer low-voltage switch has no current or not; and when the first bus at the low voltage side is determined to be out of voltage and the first main transformer becomes low-voltage switch to have no current, executing the step of checking whether the power value of the second main transformer is larger than the overload power fixed value.
In one embodiment, the backup power automatic switching load sharing device based on the transformer substation further comprises:
the voltage amplitude and vector angle acquisition module is used for acquiring the voltage of the first bus at the low voltage side to obtain a corresponding first voltage amplitude and a first vector angle, and acquiring the voltage of the second bus at the low voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle;
the amplitude vector difference value and angle vector difference value acquisition module is used for calculating based on the first voltage amplitude value and the second voltage amplitude value to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value;
the amplitude vector difference value and angle vector difference value checking module is used for checking whether the angle vector difference value is zero or not and checking whether the amplitude vector difference value is larger than a difference value threshold value or not;
The load sharing determining module is used for determining that the first main transformer and the second main transformer belong to the same power supply system when the angle vector difference value is zero and the amplitude vector difference value is not greater than a difference value threshold value, and the low-voltage side first bus and the low-voltage side second bus are in loop closing operation and continue to operate according to spare power automatic switching load sharing;
when the angle vector difference value is not zero and the amplitude vector difference value is larger than the difference value threshold value, the first main transformer and the second main transformer are determined not to belong to the same power supply system, the second main transformer low-voltage switch is tripped, and the spare power automatic switching load sharing is determined not to be executed.
The specific limitation of the automatic backup power switching load sharing device based on the transformer substation can be referred to the limitation of the automatic backup power switching load sharing method based on the transformer substation, and the description is omitted here. All or part of each module in the spare power automatic switching load sharing device based on the transformer substation can be realized through software, hardware and a combination of the software and the hardware. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 8. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to realize a spare power automatic switching load sharing method based on a transformer substation. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. The backup automatic switching load sharing method based on the transformer substation is characterized in that a primary structure of the transformer substation comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, a first main transformer low-voltage switch and a first main transformer are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer low-voltage switch and the first main transformer are connected in series; a second sectionalizer is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with the low-voltage side third bus in series; a second main transformer low-voltage switch is connected between the second main transformer and the low-voltage side second bus, a third main transformer low-voltage switch is connected between the second main transformer and the low-voltage side third bus, a first sectionalizing switch is connected between the low-voltage side third bus and the low-voltage side fourth bus, a third main transformer is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer low-voltage switch is connected between the third main transformer and the low-voltage side fourth bus; the method comprises the following steps:
Collecting a power value of a second main transformer, wherein the power value is determined based on the maximum power value of the second main transformer;
detecting whether the first bus at the low voltage side loses voltage or not, and whether the first main transformer low-voltage switch has no current or not;
when the first bus at the low voltage side is determined to lose voltage and the first main transformer becomes low-voltage switch without current, checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
detecting that the power value of the second main transformer is larger than the overload power fixed value;
waiting for delay fixed value duration, when the second main transformer meets the charging operation condition of load sharing, switching off a first main transformer low-voltage switch, and when the first main transformer low-voltage switch is confirmed to be switched off and in a split state, switching on the first sectioning switch in a delay manner, and when the first sectioning switch is confirmed to be in a closed position, switching on the second sectioning switch in a delay manner;
collecting the voltage of the first bus at the low voltage side to obtain a corresponding first voltage amplitude and a first vector angle, and collecting the voltage of the second bus at the low voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle, wherein the first voltage amplitude is the absolute value of the voltage of the first bus at the low voltage side, and the second voltage amplitude is the absolute value of the voltage of the second bus at the low voltage side;
Calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value, wherein the amplitude vector difference value and the angle vector difference value are used for: judging the result of ring closing operation between the first low-voltage side bus and the second low-voltage side bus;
checking whether the angle vector difference is zero or not, and checking whether the amplitude vector difference is larger than a difference threshold;
when the angle vector difference value is zero and the amplitude vector difference value is not greater than a difference value threshold value, determining that the first main transformer and the second main transformer belong to the same power supply system, enabling the first bus on the low-voltage side and the second bus on the low-voltage side to operate in a loop closing mode, and enabling the first bus on the low-voltage side and the second bus on the low-voltage side to continue to operate according to spare power automatic switching load sharing;
the running state of the spare power automatic switching load sharing is as follows: the first main transformer low switch is in a split state, the second main transformer low switch, the third main transformer low switch and the fourth main transformer low switch are in a closed state, and the first sectionalizing switch and the second sectionalizing switch are in a closed state.
2. The method of claim 1, wherein when the power value of the second main transformer is not greater than the overload power fixed value, it is confirmed that no backup automatic switching load sharing is performed.
3. The method of claim 2, wherein when the power value of the second main transformer is not greater than the overload power fixed value, confirming that no backup automatic switching load sharing is performed comprises:
detecting that the power value of the second main transformer is not larger than the overload power fixed value;
when the second main transformer meets the charging operation condition of no load sharing, the first main transformer low-voltage switch is turned off, and when the first main transformer low-voltage switch is confirmed to be turned off and in a split state, the second section switch is put into delay.
4. The method of claim 1, wherein when the angle vector difference is not zero and the amplitude vector difference is greater than a difference threshold, determining that the first main transformer and the second main transformer do not belong to the same power system, tripping the second main transformer low switch, and determining that no backup power load sharing is performed.
5. The spare power automatic switching load sharing device based on the transformer substation is characterized in that a first main transformer low-voltage switch and a first main transformer are connected between a first high-voltage side first bus and a first low-voltage side first bus, and the first main transformer low-voltage switch and the first main transformer are connected in series; a second sectional switch is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with a low-voltage side third bus in series; a second main transformer low-voltage switch is connected between the second main transformer and the low-voltage side second bus, a third main transformer low-voltage switch is connected between the second main transformer and the low-voltage side third bus, a first sectionalizing switch is connected between the low-voltage side third bus and the low-voltage side fourth bus, a third main transformer is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer low-voltage switch is connected between the third main transformer and the low-voltage side fourth bus; the device comprises:
The power value acquisition module is used for acquiring the power value of the second main transformer;
the voltage and current detection module is used for detecting whether the first bus at the low voltage side loses voltage or not and whether the first main transformer low-voltage switch has no current or not;
the power value verification module is used for verifying whether the power value of the second main transformer is larger than an overload power fixed value or not when the first bus at the low voltage side is determined to be out of voltage and the first main transformer becomes low-voltage switch to have no current;
the load sharing module is used for detecting that the power value of the second main transformer is larger than the overload power fixed value; waiting for delay fixed value duration, when the second main transformer meets the charging operation condition of load sharing, tripping the first main transformer low switch, and when the first main transformer low switch is determined to be tripped to be in a split state, feeding the first sectioning switch in a delay manner, and when the first sectioning switch is determined to be in a closed state, feeding the second sectioning switch in a delay manner;
the voltage amplitude and vector angle acquisition module is used for acquiring the voltage of the first bus at the low voltage side to obtain a corresponding first voltage amplitude and a corresponding first vector angle, and acquiring the voltage of the second bus at the low voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle, wherein the first voltage amplitude is the absolute value of the voltage of the first bus at the low voltage side, and the second voltage amplitude is the absolute value of the voltage of the second bus at the low voltage side;
The amplitude vector difference value and angle vector difference value acquisition module is used for calculating based on the first voltage amplitude value and the second voltage amplitude value to obtain an amplitude vector difference value, calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value, and the amplitude vector difference value and the angle vector difference value are used for: judging the result of ring closing operation between the first low-voltage side bus and the second low-voltage side bus;
the amplitude vector difference value and angle vector difference value checking module is used for checking whether the angle vector difference value is zero or not and checking whether the amplitude vector difference value is larger than a difference value threshold value or not;
the load sharing determining module is used for determining that the first main transformer and the second main transformer belong to the same power supply system when the angle vector difference value is zero and the amplitude vector difference value is not greater than a difference value threshold value, the low-voltage side first bus and the low-voltage side second bus are in loop closing operation, and the operation is continued according to spare power automatic switching load sharing;
the running state of the spare power automatic switching load sharing is as follows: the first main transformer low switch is in a split state, the second main transformer low switch, the third main transformer low switch and the fourth main transformer low switch are in a closed state, and the first sectionalizing switch and the second sectionalizing switch are in a closed state.
6. The automatic backup power switching load sharing device according to claim 5, wherein the load sharing module is further configured to confirm that automatic backup power switching load sharing is not performed when the power value of the second main transformer is not greater than the overload power fixed value.
7. The backup power automatic switching load sharing device according to claim 6, wherein the load sharing module is further configured to detect that a power value of the second main transformer is not greater than the overload power fixed value; when the second main transformer meets the charging operation condition of no load sharing, the first main transformer low-voltage switch is turned off, and when the first main transformer low-voltage switch is confirmed to be turned off and in a split state, the second section switch is put into delay.
8. The device for equally dividing the spare power automatic switching load according to claim 5, wherein the load equally dividing determining module is configured to determine that the first main transformer and the second main transformer do not belong to the same power system when the angle vector difference is not zero and the amplitude vector difference is greater than a difference threshold, and to trip the second main transformer low-voltage switch to determine that the spare power automatic switching load equally dividing is not performed.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110351166.8A CN113162030B (en) | 2021-03-31 | 2021-03-31 | Spare power automatic switching load sharing method, device and computer equipment based on transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110351166.8A CN113162030B (en) | 2021-03-31 | 2021-03-31 | Spare power automatic switching load sharing method, device and computer equipment based on transformer substation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113162030A CN113162030A (en) | 2021-07-23 |
| CN113162030B true CN113162030B (en) | 2023-07-07 |
Family
ID=76885853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110351166.8A Active CN113162030B (en) | 2021-03-31 | 2021-03-31 | Spare power automatic switching load sharing method, device and computer equipment based on transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113162030B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655191A (en) * | 2016-10-20 | 2017-05-10 | 广东电网有限责任公司电力调度控制中心 | Load equipartition method and apparatus of backup automatic switching apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710008B (en) * | 2012-03-08 | 2014-10-08 | 华南理工大学 | Three-bus four-section standby power automatic operation device self-adaption in service and out of service control method |
| CN104333118B (en) * | 2014-10-29 | 2017-06-23 | 国家电网公司 | The spare power automatic switching system and its operation method of middle resistance earthing mode self adaptation switching |
| CN106451461B (en) * | 2016-10-20 | 2018-11-27 | 广东电网有限责任公司电力调度控制中心 | The load sharing of backup auto-activating device starts method and device |
| CN111668922B (en) * | 2020-06-28 | 2022-07-26 | 深圳供电局有限公司 | 10kV spare power automatic switching action method for transformer substation |
| CN111756107A (en) * | 2020-06-29 | 2020-10-09 | 深圳供电局有限公司 | Spare power automatic switching method and system, spare power automatic switching device and storage medium |
| CN112072773B (en) * | 2020-08-05 | 2022-01-11 | 广东电网有限责任公司 | Main transformer spare power automatic switching implementation method adaptive to 10kV bus operation mode change |
| CN112366806B (en) * | 2020-11-06 | 2023-04-18 | 深圳供电局有限公司 | Load sharing method and system for spare power automatic switching device |
-
2021
- 2021-03-31 CN CN202110351166.8A patent/CN113162030B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655191A (en) * | 2016-10-20 | 2017-05-10 | 广东电网有限责任公司电力调度控制中心 | Load equipartition method and apparatus of backup automatic switching apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113162030A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105652190B (en) | Utilize the switch state inspection of the circuit block of insulated monitor | |
| Moghavvemi et al. | Real-time contingency evaluation and ranking technique | |
| US8947843B2 (en) | Fast breaker failure detection for HVDC circuit breakers | |
| Sefidgaran et al. | Reliability model of the power transformer with ONAF cooling | |
| KR20080104102A (en) | Static transfer switch device, power supply apparatus using the switch device and switching method thereof | |
| US11101687B2 (en) | Transfer switch source select systems and methods | |
| CN110716150A (en) | Energy storage system and insulation detection method thereof | |
| CN112684328A (en) | Anti-jump loop monitoring system, method and device, computer equipment and storage medium | |
| CN113162030B (en) | Spare power automatic switching load sharing method, device and computer equipment based on transformer substation | |
| CN104993582A (en) | Electric power system control method and apparatus | |
| CN114047435B (en) | Method and device for testing switching-on time discreteness of circuit breaker | |
| Gaurav et al. | Protection of low‐voltage DC microgrid based on series R–L–C equivalent circuit utilising local measurements | |
| CN113794220B (en) | Overvoltage protection method, overvoltage protection device, computer equipment and storage medium | |
| CN115498608A (en) | Method, device and equipment for pre-identifying line interelectrode short circuit under metal return wire | |
| CN113054656A (en) | Distribution transformer overhauling method and device, electronic equipment and storage medium | |
| CN113193643B (en) | Spare power automatic switching device switching method and device based on transformer substation | |
| Heidari-Kapourchali et al. | Component reliability evaluation in the presence of smart monitoring | |
| Matavalam et al. | Reliability assessment of industrial circuit breakers with design enhancements | |
| CN118017496A (en) | Automatic phase selection and power restoration method and device for phase change switch and computer equipment | |
| CN114062916B (en) | Method and device for detecting running state of phase selection switching-on device | |
| CN113437806B (en) | Method and device for controlling opening of metal loop switch and computer equipment | |
| CN112039083B (en) | Control method and device for load transfer across bypass buses | |
| KR102658099B1 (en) | Battery management system for battery having plateau and operating method thereof | |
| Darvishi et al. | Area angle can monitor cascading outages with synchrophasors | |
| Masuda et al. | Simulation studies of fault events in 66 kV superconducting cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |