CN108051706B - Fault identification method and system for automatic standby power supply switching device - Google Patents
Fault identification method and system for automatic standby power supply switching device Download PDFInfo
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Abstract
A fault identification method and a system for an automatic standby power supply switching device relate to a method and a system for automatic standby power supply switching of a transformer substation. The method comprises the following steps: the method comprises the steps that a merging unit intelligent terminal integrated device is installed on a bus coupler and an incoming line in a centralized mode, the voltage of a bus and the incoming line, the current of the incoming line and a section and the position of a switch are collected, an optical signal message is sent to a spare power automatic switching device, and meanwhile a command from the spare power automatic switching device is received and executed to control the operation of a circuit breaker; the current direction of the spare power automatic switching device is automatically judged to be used as a criterion for fault positioning; when the starting condition of the backup power automatic switching is met, the backup power automatic switching device judges whether bus faults or transformer faults exist, then executes backup power automatic switching logic according to strategies, and automatically identifies the fault types. The system comprises an automatic standby power supply switching device, a merging unit intelligent terminal integrated device, a direction monitoring unit for monitoring the direction and the size of the current of a line in real time, and a fault judging and positioning monitoring unit. The invention can effectively improve the power supply reliability of the power network and the stability of the power grid operation.
Description
Technical Field
The invention relates to a method and a system for automatically switching in a standby power supply of a transformer substation, in particular to a method and a system for automatically switching in a standby power supply, which have the advantages that the protection of a 110kV voltage level is not provided with a bus, the fault type needs to be automatically identified by the standby power supply, and different logics are executed.
Background
With the rapid development of social economy, the requirements of power consumers on the power supply reliability and the operation stability of the power grid are higher and higher.
The spare power automatic switching device in the intelligent substation can automatically detect the operation mode of the substation in the substation, complete the automatic switching logic of the spare power supply, greatly improve the power supply reliability of a power grid, and plays an important role in a power grid automation system. However, at present, a mainstream 110kV voltage class transformer substation is not separately provided with bus protection, so that when a bus fault occurs, a backup protection action of a transformer or a line is used for removing, a backup power source automatic device is used for removing, but the risk of switching on the bus fault exists; when the transformer acts, the action types of the main-flow backup power automatic switching can not be distinguished, the backup power automatic switching is directly locked, and the condition of partial coincidence loss exists. At present, no standby power supply automatic switching device capable of automatically judging fault types and executing different strategies according to related electric quantities and switching quantities exists.
Disclosure of Invention
One purpose of the invention is to provide a fault identification method for an automatic switching-in device of a standby power supply, which can quickly and accurately judge the fault type in an intelligent substation and realize the automatic switching-in of the standby power supply according to a response strategy.
One of the purposes of the invention can be realized by designing a fault identification method for an automatic standby power supply switching-in device, which comprises the following steps:
A. the method comprises the steps that a merging unit intelligent terminal integrated device is installed on a bus coupler and an incoming line in a centralized mode, bus voltage, incoming line current, sectional current and incoming line and sectional switch positions are collected, message light signals are sent to a spare power automatic switching device, tripping and closing commands from the spare power automatic switching device are received and executed at the same time, and the operation of a circuit breaker is controlled;
B. the spare power automatic switching device automatically judges the current direction of the spare power automatic switching device according to the relation between the bus voltage and the incoming line current transmitted by the line merging unit intelligent terminal integrated device, and the current direction is used as a criterion for fault positioning;
the relation between the bus voltage and the incoming line current specifies that the line flow direction bus is a positive direction, the direction element adopts 90-degree wiring, and the positive direction action equation is as follows:
in the formula:
and
respectively representing corresponding incoming line current and bus voltage in a 90-degree wiring mode;
when the device judges that the current value is in the positive direction and is greater than the fault current threshold, the fault point is below the current transformer of the circuit breaker at the moment; if the direction is the reverse direction, the fault is a line fault;
C. when the bus voltage does not meet the pressure condition and simultaneously meets the backup power automatic switching starting condition, the backup power automatic switching device judges whether a bus fault or a transformer fault exists according to the relation between the related alternating current and the electric quantity, and then executes different backup power automatic switching logics according to different strategies to automatically identify the fault type.
Further, when the bus tie spare power automatic switching mode is adopted, the charging is carried out when the following conditions are met: 1a, the bus coupler switch is in a brake-off state; 1b, the incoming line switch is in a closing state; 1c, the bus voltage is higher than the bus voltage with a fixed value;
discharging when any of the following conditions is met: 2a, a locking incoming line self-throwing-in device 1; 2b, remotely controlling or manually opening a switch of one of the incoming lines; 2c, setting a transformer action signal to be 1; 2d, closing the bus coupler switch; 2e, the voltage of the two sections of buses does not meet the requirement that the voltage time is more than 15 s; 2f, the overhaul state of the intelligent terminal integrated device of the incoming line merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2g, the overhaul state of the intelligent terminal integrated device of the bus union merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2h, a bus tie spare power automatic switching soft pressing plate or a control word is not put in; 2i, the incoming line switch rejects tripping or the bus coupler switch rejects closing;
when the spare power automatic switching device receives an action signal from the transformer protection device, the spare power automatic switching device considers that the corresponding transformer protection has a fault at the moment, and the spare power automatic switching device is required to directly discharge;
the current flowing through the inlet wire is larger than a set fault current threshold, and the current is judged to be in the positive direction according to the direction criterion, and the device judges that the corresponding bus has a fault; firstly, cutting off the incoming line switch, and closing the bus coupler switch; after the bus tie switch is closed, if the corresponding bus fault is an instantaneous fault, the fault is eliminated at the moment, and the system can normally run; if the corresponding bus fault is a permanent fault, after the bus coupler switch is closed, the fault current passing through the bus coupler CT is larger than a post-acceleration fixed value, at the moment, a post-acceleration function of the bus coupler is started, the bus coupler switch is switched on, and a fault point is isolated;
and if the current flowing through the incoming line is smaller than the set fault current threshold or the current is judged to be in the opposite direction according to the direction criterion, the device judges that the line has a fault, firstly, the corresponding incoming line switch is cut off, and the bus coupler switch is closed, so that the total station does not lose voltage.
Further, when the system is in an incoming line spare power automatic switching mode, the system is charged when the following conditions are met: 3a, the incoming line switch is in a brake-off state; 3b, the other incoming line switch is in a closing state; 3c, the bus voltage is higher than the bus voltage with a fixed value; 3d, the bus coupler switch is in a closing state; 3e, when the input line voltage control word is detected to be input, the input line extraction voltage is higher than the input line voltage fixed value;
discharging when any of the following conditions is met: 4a, a locking incoming line self-throwing-in device 1; 4b, remotely controlling or manually opening the other incoming line switch on site; 4c, setting the transformer action signal to be 1; 4d, closing the incoming line switch; 4e, when the input of the incoming line voltage control word is detected, the time that the incoming line extraction voltage does not meet the voltage requirement is more than 15 s; 4f, the overhaul state of the intelligent terminal integrated device of the incoming line merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 4g, the overhaul state of the intelligent terminal integrated device of the bus combined unit is inconsistent with the overhaul state of the spare power automatic switching device; 4h, the incoming line spare power automatic switching soft pressing plate or the control word is not switched in; 4i, the other incoming line switch rejects tripping, or the incoming line switch rejects closing, or the bus-coupled switch rejects tripping;
when the spare power automatic switching device receives an action signal from the 1# transformer protection device, the 1# transformer protection is considered to have a fault at the moment, the spare power automatic switching device is started at the moment, the incoming line '1' switch and the bus coupler switch are tripped, and then the incoming line '2' switch is switched on;
when the spare power automatic switching device receives an action signal from the 2# transformer protection device, the 2# transformer protection device is considered to have a fault, the spare power automatic switching device is required to directly discharge, and the situation that the system stability is influenced due to the fact that a switch is switched on due to the fault is avoided;
the current flowing through the inlet wire 1 is larger than a set fault current threshold, and is judged to be in the positive direction according to the direction criterion, the device judges that the bus has a fault, the bus tie switch is firstly cut off, the current flowing through the inlet wire 1 disappears after the bus tie switch is cut off, and the fault point is on the bus II and is cut off; if the current flowing through the incoming line 1 still exists, the fault point is on the I bus, the device cuts off the incoming line 1 switch, and closes the incoming line 2 switch to ensure that the II bus load is not cut off;
the current flowing through the inlet wire 1 is smaller than a set fault current threshold, or the current is judged to be in the opposite direction according to the direction criterion, the device judges that the line has a fault, firstly, the switch of the inlet wire 1 is cut off, and the switch of the inlet wire 2 is closed, so that the total station is ensured not to lose voltage.
One of the purposes of the invention can be realized by designing a fault identification system of an automatic standby power supply switching device, which comprises the automatic standby power supply switching device, an intelligent terminal integrated device of a merging unit, a direction monitoring unit for monitoring the current direction and the current magnitude of a line in real time, and a fault judgment and positioning monitoring unit,
the standby power supply automatic switching device automatically judges the fault condition according to the electric quantity and switching quantity information provided by the merging unit intelligent terminal integrated device, executes logic corresponding to the fault type according to the fault type and ensures the reliability and stability of a power supply system;
the merging unit intelligent terminal integrated device is used for sending out light signals according to analog quantity sampling values acquired by the acquisition device, the switch position of the circuit breaker and the transformer substation synchronous signals, receiving control commands from the automatic standby power supply switching device and operating a circuit breaker mechanism;
the direction monitoring unit monitors the direction and the magnitude of the line current in real time and judges the direction and the magnitude of the current according to the received bus voltage and the line current;
and the fault judging and positioning monitoring unit judges the fault according to the monitoring result of the direction monitoring unit for monitoring the direction and the size of the line current in real time and positions a fault point by switching a switch.
The invention adopts the structure that the merging unit intelligent terminal integrated unit which can detect the states of the bus voltage and the incoming line current direction of the substation in real time, monitor the system electric quantity and the breaker switch information in real time, and other protection device action signals in real time, send the states to the automatic bus transfer device in real time through optical signals and receive the automatic bus transfer command from the spare power supply, so that the automatic bus transfer device system can effectively improve the power supply reliability of a power network and the running stability of the power network, is suitable for being used as a common conventional automatic bus transfer device and can also be used as an automatic bus transfer device with a fault identification function.
Drawings
FIG. 1 is a schematic diagram of a network architecture according to a preferred embodiment of the present invention;
FIG. 2 is a logic diagram of the incoming "" 2 "" self-launch operation of the preferred embodiment of the present invention;
FIG. 3 is a logic diagram of the operation of the segmented automatic power switch according to the preferred embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention relates to a spare power automatic switching method of an intelligent spare power automatic switching device (also called a spare power automatic switching device) designed for a main connection wire of a transformer substation with a single bus, a single bus with a bypass, a single bus section and a single bus section with a bypass. The invention can judge the fault type of the power system according to the electric quantity information such as the input quantity, the alternating current quantity and the like of the device and execute different logics according to different fault types.
A fault identification method for an automatic standby power supply switching device comprises the following steps:
A. the method comprises the steps that a merging unit intelligent terminal integrated device is installed on a bus coupler and an incoming line in a centralized mode, bus voltage, incoming line current, sectional current and incoming line and sectional switch positions are collected, an IEC61850 message optical signal is sent to a spare power automatic switching device, tripping and closing commands from the spare power automatic switching device are received and executed at the same time, and the operation of a circuit breaker is controlled;
B. the spare power automatic switching device automatically judges the current direction of the spare power automatic switching device according to the relation between the bus voltage and the incoming line current transmitted by the line merging unit intelligent terminal integrated device, and the current direction is used as a criterion for fault positioning;
C. when the bus voltage does not meet the pressure condition and simultaneously meets the backup power automatic switching starting condition, the backup power automatic switching device judges whether a bus fault or a transformer fault exists according to the relation between the related alternating current and the electric quantity, then different backup power automatic switching logics are executed according to different strategies, the fault type is automatically identified, and the purpose of reliable and stable power supply is guaranteed.
The spare power automatic switching device automatically judges the current direction according to the relation between the bus voltage and the incoming line current transmitted by the line merging unit intelligent terminal integrated device, and the current direction is used as a criterion for fault positioning, wherein the criterion is as follows: the relation between the bus voltage and the incoming line current specifies that the direction element is connected by 90 degrees (Ia → Ubc/Ib → Uca/Ic → Uab) by taking the direction from the line flow to the bus as the positive direction, and the action equation of the positive direction is as follows:
in the formula:
and
representing the corresponding current and voltage quantities in the 90 deg. wiring mode, respectively.
When the device judges that the current value is in the positive direction and is greater than the fault current threshold, the fault point is below the current transformer of the circuit breaker at the moment; if the direction is the reverse direction, the fault is a line fault. The fault discrimination and direction recognition function device judges in real time, ensures the reliability and completeness of data, and eliminates the risks of misjudgment and misjudgment.
The invention is realized as follows:
1. as shown in fig. 1 and 2, the incoming line "2" is taken as an example of self-casting.
When the system is in an incoming line spare power automatic switching mode, the system is charged when the following conditions are met: 3a, the incoming line switch (incoming line 2 switch) is in an opening state; 3b, the other incoming line switch (incoming line 1 switch) is in a closing state; 3c, the bus voltage is higher than the bus voltage with a fixed value; 3d, the bus coupler switch is in a closing state; 3e, when the incoming line (incoming line '2') voltage control word is detected to be put in, the incoming line (incoming line '2') draws a voltage that is higher than the incoming line voltage by a fixed value.
Discharging when any of the following conditions is met: 4a, a locking incoming line self-throwing-in device 1; 4b, remotely controlling or manually opening another incoming line switch (incoming line '1' switch); 4c, setting the action signal of the transformer (2# transformer) to be 1; 4d, the incoming line switch (incoming line 2 switch) is closed; 4e, when the incoming line (incoming line '2') voltage control word is detected to be put in, the voltage extracted by the incoming line (incoming line '2') does not meet the requirement that the voltage time is more than 15 s; 4f, the overhaul state of the intelligent terminal integrated device of the incoming line (incoming line 1 or incoming line 2) merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 4g, the overhaul state of the intelligent terminal integrated device of the bus combined unit is inconsistent with the overhaul state of the spare power automatic switching device; 4h, the incoming line (incoming line '2') is provided with a spare power automatic switching soft pressing plate or a control word is not switched in; 4i, the other incoming line switch (incoming line '1' switch) rejects the jump or the incoming line switch (incoming line '2' switch) rejects the closing or the bus-bar switch rejects the jump.
The action logic is divided into: the device can execute different strategies according to various conditions under the conditions of 1# main transformer fault, 2# main transformer fault, I bus fault, II bus fault, inlet wire 2 line fault and the like.
When the spare power automatic switching device receives an action signal from the 1# transformer protection device, the 1# transformer protection is considered to have a fault at the moment, the spare power automatic switching device is started at the moment, the incoming line '1' switch and the bus coupler switch are opened, and then the incoming line '2' switch is closed. When a 1# transformer breaks down, the spare power automatic switching device receives a GOOSE action signal sent by a 1# main transformer protection, judges whether the voltage of an I bus and the voltage of an II bus are both lower than a bus non-voltage fixed value, if the condition that the two bus voltages are both lower than the bus non-voltage fixed value is met, the spare power automatic switching device starts, trips to an inlet wire '1' switch and a bus connection switch through setting delay, and sends an action signal and simultaneously discharges the spare power automatic switching device; after confirming that the incoming line 1 switch and the bus coupler switch are tripped off, automatically sending a command of closing the incoming line 2 switch after a time constant value; and (3) confirming that the switch of the inlet wire 2 is switched on, and sending a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the process of the backup power automatic switching action is stopped, and a report of failure of the backup power automatic switching is sent. At the moment, the fault is isolated, the II bus load is not cut off, and the power supply reliability is improved.
When the backup power automatic switching device receives an action signal from the 2# transformer protection device, the 2# transformer protection device is considered to have a fault, and the backup power automatic switching device is required to directly discharge to prevent the backup power automatic switching device from being switched on to the fault, so that the system stability is influenced. When the 2# transformer fails, the backup power automatic switching device receives a GOOSE action signal sent by the 2# main transformer protection, and the backup power automatic switching device directly discharges and cannot act at the moment, because if the incoming line 2 is directly connected to the fault, impact is caused to the power system.
The current flowing through the inlet wire 1 is larger than a set fault current threshold, and is judged to be in the positive direction according to the direction criterion, the device judges that the bus has a fault, the bus tie switch is firstly cut off, the current flowing through the inlet wire 1 disappears after the bus tie switch is cut off, and the fault point is on the bus II and is cut off; if the current flowing through the incoming line 1 still exists, the fault point is on the I bus, the device cuts off the incoming line 1 switch, and closes the incoming line 2 switch, so that the II bus load is not cut off. When II bus faults occur, the voltage of the I bus and the voltage of the II bus are both lower than a bus non-voltage fixed value, meanwhile, the incoming line '1' direction criterion can judge that the current is in the positive direction, namely, the current flows to the bus through a line. The spare power automatic switching device judges that the bus has a fault. The device sends an action signal through a setting delay bus-coupled switch, and meanwhile, the spare power automatic switching device discharges electricity; and after the bus tie switch is determined to be tripped, if the current flowing through the inlet wire 1 is lower than the fault current fixed value, the fault is on the II bus and isolated, and the spare power automatic switching device sends a report of the completion of the spare power automatic switching. And in the process of the backup power automatic switching action, the bus-coupled switch rejects, the process of the backup power automatic switching action is stopped, and a report of failure of the backup power automatic switching is sent.
When I bus has a fault, the voltage of the I bus and the voltage of the II bus are both lower than a bus non-voltage fixed value, and meanwhile, the incoming line '1' direction criterion can judge that the current is in the positive direction at the moment, namely, the current flows to the bus through a line. The spare power automatic switching device judges that the bus has a fault. The device sends an action signal through a setting delay bus-coupled switch, and meanwhile, the spare power automatic switching device discharges electricity; after the bus tie switch is determined to be tripped, if the current flowing through the inlet wire 1 is still larger than the fault current fixed value, the fault still exists on the bus I at the moment, and the inlet wire 1 switch is tripped through setting delay, and the device sends an action signal; after the switch of the inlet wire '1' is confirmed to be tripped, a switch command of closing the inlet wire '2' is automatically sent out after a time fixed value, and the spare power automatic switching device sends out a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the backup power automatic switching action process is stopped, and a report of failure of the backup power automatic switching is sent.
The current flowing through the inlet wire 1 is smaller than a set fault current threshold, or the current is judged to be in the opposite direction according to the direction criterion, the device judges that the line has a fault, firstly, the switch of the inlet wire 1 is cut off, and the switch of the inlet wire 2 is closed, so that the total station is ensured not to lose voltage. When a line breaks down, the voltage of a bus I and the voltage of a bus II are both lower than a non-voltage fixed value of the bus, meanwhile, the direction criterion of the incoming line 1 judges that the direction is the reverse direction at the moment, namely, the current flows to the line from the bus, the spare power automatic switching trips to the incoming line 1 switch through a setting delay at the moment, the device sends an action signal, and meanwhile, the spare power automatic switching discharges; after the switch of the incoming line 1 is confirmed to be tripped, a switch command of closing the incoming line 2 is automatically sent out after a time constant value; and (3) confirming that the switch of the inlet wire 2 is switched on, and sending a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the process of the backup power automatic switching action is stopped, and a report of failure of the backup power automatic switching is sent.
2. As shown in fig. 1 and 3, taking the bus tie backup automatic switching as an example:
when the bus tie spare power automatic switching mode is adopted, the charging is carried out when the following conditions are met: 1a, the bus coupler switch is in a brake-off state; 1b, leading-in switches (leading-in 1 switch and leading-in 2 switch) are in a closing state; 1c, the bus voltage is higher than the bus voltage by a fixed value.
Discharging when any of the following conditions is met: 2a, a locking incoming line self-throwing-in device 1; 2b, a switch (an incoming line '1' switch or an incoming line '2' switch) for tripping off one of the incoming lines remotely or manually on site; 2c, setting an action signal of one of the incoming line transformers (the 1# transformer or the 2# transformer) to be 1; 2d, closing the bus coupler switch; 2e, the voltage of the two sections of buses does not meet the requirement that the voltage time is more than 15 s; 2f, the overhaul state of the intelligent terminal integrated device of the incoming line (incoming line 1 or incoming line 2) merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2g, the overhaul state of the intelligent terminal integrated device of the bus union merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2h, a bus tie spare power automatic switching soft pressing plate or a control word is not put in; and 2i, the incoming line switch (an incoming line '1' switch or an incoming line '2' switch) is rejected, or the bus coupler switch is rejected.
The action logic is divided into: the device can execute different strategies according to various conditions under the conditions of 1# main transformer fault, 2# main transformer fault, I bus fault, II bus fault, inlet wire 2 line fault and the like.
When the spare power automatic switching device receives an action signal from the transformer protection device, the fault corresponding to the transformer protection exists at the moment, and the spare power automatic switching device is required to directly discharge to prevent the switch-on from being carried out on the fault, so that the stability of the system is not influenced. When a 1# transformer has a fault or a 2# main transformer has a fault, when a transformer has a fault, the spare power automatic switching device receives a GOOSE action signal sent by 1# main transformer protection or 2# main transformer protection, and the spare power automatic switching device directly discharges electricity and cannot act, because if a combined incoming line 2 is directly connected to the fault, impact is caused to an electric power system.
When the I bus has a fault, the voltage of the I bus is lower than a non-voltage fixed value of the bus, and meanwhile, the direction criterion of the inlet wire 1 judges that the current is in a positive direction, namely the current flows to the bus from a line. The spare power automatic switching device judges that the bus has a fault. Through a setting delay incoming line '1' switch, the device sends an action signal and is automatically switched on and off; after the switch of the incoming line 1 is determined to be tripped, a bus coupler switch closing command is automatically sent out after a time fixed value, the bus coupler switch is determined to be closed, and the spare power automatic switching device sends out a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the backup power automatic switching action process is stopped, and a report of failure of the backup power automatic switching is sent. After the bus tie switch is closed, if the I bus fault is a transient fault, the fault is eliminated at the moment, and the system can normally run; if the I bus fault is a permanent fault, after the bus-tie switch is closed, the fault current passing through the bus-tie CT is larger than a post-acceleration fixed value, at the moment, a post-acceleration function of the bus-tie is started, the bus-tie switch is switched on, and a fault point is isolated.
When II bus faults occur, the voltage of the II bus is lower than a bus non-voltage fixed value, meanwhile, the incoming line '2' direction criterion can judge that the current is positive, namely, the current flows to the bus through a line. The spare power automatic switching device judges that the bus has a fault. Through a setting delay incoming line 2 switch, the device sends an action signal and is automatically switched on and off; after the switch of the incoming line 2 is determined to be tripped, a bus coupler switch closing command is automatically sent out after a time fixed value, the bus coupler switch is determined to be closed, and the spare power automatic switching device sends out a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the backup power automatic switching action process is stopped, and a report of failure of the backup power automatic switching is sent. After the bus tie switch is closed, if the II bus fault is a transient fault, the fault is eliminated, and the system can normally run; if the II bus fault is a permanent fault, after the bus tie switch is closed, the fault current passing through the bus tie CT is larger than a post-acceleration fixed value, at the moment, a post-acceleration function of the bus tie is started, the bus tie switch is switched off, and a fault point is isolated.
When a line fails, the voltage of an I bus is lower than a bus non-voltage fixed value, meanwhile, the incoming line '1' direction criterion can judge that the current is in the opposite direction, namely, the current flows to the line from the bus, at the moment, the spare power automatic switching trips to an incoming line '1' switch through a setting delay, the device sends an action signal, and meanwhile, the spare power automatic switching discharges; after the switch of the incoming line 1 is confirmed to be tripped, a command of closing the bus coupler switch is automatically sent out after a time constant value; and (5) confirming that the bus tie switch is switched on, and sending a report of the completion of the spare power automatic switching. In the process of the backup power automatic switching action, any switch is rejected to jump or close, the process of the backup power automatic switching action is stopped, and a report of failure of the backup power automatic switching is sent.
The spare power automatic switching mode is a self-adaptive mode, and the device can automatically judge according to the position of the corresponding circuit breaker without manual switching.
As shown in fig. 1, a fault identification system for an automatic standby power supply switching device includes an automatic standby power supply switching device, a merging unit and intelligent terminal integrated device, a direction monitoring unit for monitoring the direction and magnitude of a line current in real time, and a fault judgment and positioning monitoring unit.
The automatic standby power supply switching device automatically judges the fault condition according to the electric quantity and switching quantity information provided by the intelligent terminal integrated device of the merging unit, executes logic corresponding to the fault type according to the fault type, and ensures the reliability and stability of a power supply system.
And the merging unit intelligent terminal integrated device sends out light signals according to the analog quantity sampling value collected by the collector, the switch position of the circuit breaker and the transformer substation synchronous signals, and simultaneously receives a control command from the automatic standby power supply switching device to operate the circuit breaker mechanism.
And the direction monitoring unit monitors the direction and the magnitude of the line current in real time and judges the direction and the magnitude of the current according to the received bus voltage and the line current.
And the fault judging and positioning monitoring unit judges the fault according to the monitoring result of the direction monitoring unit for monitoring the direction and the size of the line current in real time and positions a fault point by switching a switch.
The running information of the device can be monitored at other clients, and corresponding data records are stored after each action for subsequent investigation.
The invention adopts the structure that the merging unit intelligent terminal integrated unit which can detect the states of the bus voltage and the incoming line current direction of the substation in real time, monitor the system electric quantity and the breaker switch information in real time, and other protection device action signals in real time, send the states to the automatic bus transfer device in real time through optical signals and receive the automatic bus transfer command from the spare power supply, so that the automatic bus transfer device system can effectively improve the power supply reliability of a power network and the running stability of the power network, is suitable for being used as a common conventional automatic bus transfer device and can also be used as an automatic bus transfer device with a fault identification function.
Claims (8)
1. A fault identification method for an automatic standby power supply switching device is characterized by comprising the following steps:
A. the method comprises the steps that a merging unit intelligent terminal integrated device is installed on a bus coupler and an incoming line in a centralized mode, bus voltage, incoming line current, sectional current and incoming line and sectional switch positions are collected and sent to a spare power automatic switching device through optical signal messages, and meanwhile tripping and closing commands from the spare power automatic switching device are received and executed to control the operation of a circuit breaker;
B. the spare power automatic switching device automatically judges the current direction of the spare power automatic switching device according to the relation between the bus voltage and the incoming line current transmitted by the line merging unit intelligent terminal integrated device, and the current direction is used as a criterion for fault positioning;
the relation between the bus voltage and the incoming line current specifies that the line flow direction bus is a positive direction, the direction element adopts 90-degree wiring, and the positive direction action equation is as follows:
in the formula:
and
respectively representing corresponding incoming line current and bus voltage in a 90-degree wiring mode;
when the device judges that the current value is in the positive direction and is greater than the fault current threshold, the fault point is below the current transformer of the circuit breaker at the moment; if the direction is the reverse direction, the fault is a line fault;
C. when the bus voltage does not meet the pressure condition and simultaneously meets the backup power automatic switching starting condition, the backup power automatic switching device judges whether a bus fault or a transformer fault exists according to the relation between the related alternating current and the electric quantity, and then executes different backup power automatic switching logics according to different strategies to automatically identify the fault type.
2. The method for identifying a fault in an automatic standby power supply switching device according to claim 1, wherein: the device determines real-time determination.
3. The method for identifying a fault in an automatic standby power supply switching device according to claim 1, wherein: when the bus tie spare power automatic switching mode is adopted, the charging is carried out when the following conditions are met: 1a, the bus coupler switch is in a brake-off state; 1b, the incoming line switch is in a closing state; 1c, the bus voltage is higher than the bus voltage with a fixed value;
discharging when any of the following conditions is met: 2a, a locking incoming line self-throwing-in device 1; 2b, remotely controlling or manually opening a switch of one of the incoming lines; 2c, setting a transformer action signal to be 1; 2d, closing the bus coupler switch; 2e, the voltage of the two sections of buses does not meet the requirement that the voltage time is more than 15 s; 2f, the overhaul state of the intelligent terminal integrated device of the incoming line merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2g, the overhaul state of the intelligent terminal integrated device of the bus union merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 2h, a bus tie spare power automatic switching soft pressing plate or a control word is not put in; 2i, the incoming line switch rejects tripping or the bus coupler switch rejects closing;
when the spare power automatic switching device receives an action signal from the transformer protection device, the spare power automatic switching device considers that the corresponding transformer protection has a fault at the moment, and the spare power automatic switching device is required to directly discharge;
the current flowing through the inlet wire is larger than a set fault current threshold, and the current is judged to be in the positive direction according to the direction criterion, and the device judges that the corresponding bus has a fault; firstly, cutting off the incoming line switch, and closing the bus coupler switch; after the bus tie switch is closed, if the corresponding bus fault is an instantaneous fault, the fault is eliminated at the moment, and the system can normally run; if the corresponding bus fault is a permanent fault, after the bus coupler switch is closed, the fault current passing through the bus coupler CT is larger than a post-acceleration fixed value, at the moment, a post-acceleration function of the bus coupler is started, the bus coupler switch is switched on, and a fault point is isolated;
and if the current flowing through the incoming line is smaller than the set fault current threshold or the current is judged to be in the opposite direction according to the direction criterion, the device judges that the line has a fault, firstly, the corresponding incoming line switch is cut off, and the bus coupler switch is closed, so that the total station does not lose voltage.
4. The method for identifying a fault in an automatic standby power supply switching device according to claim 1, wherein: when the system is in an incoming line spare power automatic switching mode, the system is charged when the following conditions are met: 3a, the incoming line switch is in a brake-off state; 3b, the other incoming line switch is in a closing state; 3c, the bus voltage is higher than the bus voltage with a fixed value; 3d, the bus coupler switch is in a closing state; 3e, when the input line voltage control word is detected to be input, the input line extraction voltage is higher than the input line voltage fixed value;
discharging when any of the following conditions is met: 4a, a locking incoming line self-throwing-in device 1; 4b, remotely controlling or manually opening the other incoming line switch on site; 4c, setting the transformer action signal to be 1; 4d, closing the incoming line switch; 4e, when the input of the incoming line voltage control word is detected, the time that the incoming line extraction voltage does not meet the voltage requirement is more than 15 s; 4f, the overhaul state of the intelligent terminal integrated device of the incoming line merging unit is inconsistent with the overhaul state of the spare power automatic switching device; 4g, the overhaul state of the intelligent terminal integrated device of the bus combined unit is inconsistent with the overhaul state of the spare power automatic switching device; 4h, the incoming line spare power automatic switching soft pressing plate or the control word is not switched in; 4i, the other incoming line switch rejects tripping, or the incoming line switch rejects closing, or the bus-coupled switch rejects tripping;
when the spare power automatic switching device receives an action signal from the 1# transformer protection device, the 1# transformer protection is considered to have a fault at the moment, the spare power automatic switching device is started at the moment, the incoming line '1' switch and the bus coupler switch are tripped, and then the incoming line '2' switch is switched on;
when the spare power automatic switching device receives an action signal from the 2# transformer protection device, the 2# transformer protection device is considered to have a fault, the spare power automatic switching device is required to directly discharge, and the situation that the system stability is influenced due to the fact that a switch is switched on due to the fault is avoided;
the current flowing through the inlet wire 1 is larger than a set fault current threshold, and is judged to be in the positive direction according to the direction criterion, the device judges that the bus has a fault, the bus tie switch is firstly cut off, the current flowing through the inlet wire 1 disappears after the bus tie switch is cut off, and the fault point is on the bus II and is cut off; if the current flowing through the incoming line 1 still exists, the fault point is on the I bus, the device cuts off the incoming line 1 switch, and closes the incoming line 2 switch to ensure that the II bus load is not cut off;
the current flowing through the inlet wire 1 is smaller than a set fault current threshold, or the direction criterion judges that the current is in the opposite direction, the device judges that the line has a fault, firstly, a switch of the inlet wire 1 is cut off, and a switch of the inlet wire 2 is closed, so that the total station is ensured not to lose voltage.
5. The method for identifying a fault in an automatic standby power supply switching device according to claim 3 or 4, wherein: the spare power automatic switching mode is a self-adaptive mode, and the device can automatically judge according to the position of a corresponding breaker without manual switching.
6. The method for identifying a fault in an automatic standby power supply switching device according to claim 1, wherein: the optical signals are sent out by adopting an IEC61850 format.
7. A fault identification system for an automatic standby power supply switching device is characterized in that: comprises an automatic standby power supply switching device, a merging unit intelligent terminal integrated device, a direction monitoring unit for monitoring the current direction and the current magnitude of a line in real time, and a fault judging and positioning monitoring unit,
the standby power supply automatic switching device automatically judges the fault condition according to the electric quantity and switching quantity information provided by the merging unit intelligent terminal integrated device, executes logic corresponding to the fault type according to the fault type and ensures the reliability and stability of a power supply system;
the merging unit intelligent terminal integrated device is used for sending out light signals according to analog quantity sampling values acquired by the acquisition device, the switch position of the circuit breaker and the transformer substation synchronous signals, receiving control commands from the automatic standby power supply switching device and operating a circuit breaker mechanism;
the direction monitoring unit monitors the direction and the magnitude of the line current in real time and judges the direction and the magnitude of the current according to the received bus voltage and the line current;
and the fault judging and positioning monitoring unit judges the fault according to the monitoring result of the direction monitoring unit for monitoring the direction and the size of the line current in real time and positions a fault point by switching a switch.
8. The backup power supply automatic switching device failure recognition system according to claim 7, characterized in that: and monitoring the running information of the device at other clients, and storing corresponding data records after each action for subsequent investigation.
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