CN110323724B - Annular power distribution network relay protection device capable of automatically judging direction and control method - Google Patents
Annular power distribution network relay protection device capable of automatically judging direction and control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention relates to the technical field of power grid safety, in particular to an automatic direction-judging relay protection device for an annular power distribution network, which is arranged at each node of a connecting line and comprises a communication module, a clock, an ammeter, a memory and a controller, wherein the ammeter measures the current of the node of the connecting line, the memory stores a unique number and a node sequence relation, the clock provides a current timestamp, the communication module is in communication connection with a branch ammeter, the communication module, the clock, the memory and the ammeter are all connected with the controller, and the controller is connected with a control end of a relay switch. The substantial effects of the invention are as follows: the position of the fault branch can be judged through the action signal, so that the fault branch can be cut off in a targeted manner, and the expansion of accidents is avoided.
Description
Technical Field
The invention relates to the technical field of power grid safety, in particular to a relay protection device of an annular power distribution network and a control method thereof, wherein the relay protection device can automatically judge the direction.
Background
The traditional upper and lower distribution network protection mainly depends on a setting method to realize the selectivity of upper and lower protection actions. If the grade difference is too small, the grade-crossing action is easy to cause, the power failure range is expanded, and the requirement of distribution network automation on the power supply reliability cannot be met; if the reliable level difference is kept, large impact load occurs in a lower level area, and the lower level protection malfunction can be brought, so that the power supply reliability of the distribution network is reduced. Therefore, there is a need for a technical solution to achieve protection that can reliably sense a fault signal and ensure the selectivity of protection action during a fault in a zone. The problem of poor upper and lower level protection selectivity of the power distribution network is solved, and the reliability of power supply of the power distribution network is improved.
At present, a technical scheme of judging fault positions by an active communication mode and further accurately cutting off fault branches is provided. For example, chinese patent CN108123424A, published 2018, 6 and 5, a method for protecting a relay in a ring network power supply with both fast mobility and selectivity is applicable to a single-side ring network power supply system, and realizes interlocking current protection by sending a locking signal and an enabling signal to improve fast mobility and selectivity on the basis of realizing interlocking current protection by sending a locking signal to each other in the conventional current protection interlocked with each other. The method comprises the following steps: 1) setting a criterion of mutual transmission permission signals in a relay protection device: when the circuit breaker is in the closed position and the voltage is less than the rated voltage, or a blocking signal is received and the current is less than the fixed value, an allowing signal is sent; 2) setting an interlocking allowable current protection action criterion in a relay protection device: and when the permission signal is received, the current is larger than the interlocking current protection fixed value, and tripping is protected after the time delay of the interlocking permission type current protection time. And the current protection is matched with the traditional interlocking and locking type current protection to form looped network interlocking current protection. But it is not suitable for double-sided current protection of the ring network.
The ring power supply is a power supply mode for closing a power supply, a power line and a user into a ring. This power supply method can adjust the power supply between the power sources. When any line segment in the ring has a fault, other lines can supply power, and the power can not be influenced by users. This power supply is often used for important users to improve the reliability of power supply. The ring power supply is more economical than the dual-loop radiation power supply. Therefore, a relay protection device with a tide direction determination function needs to be developed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that a relay protection scheme suitable for a ring-shaped power distribution network is lacked at present. The relay protection device and the control method for the annular power distribution network are rapid in fault removal and good in selectivity and have automatic direction judgment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a relay protection device of an annular power distribution network capable of automatically judging the direction comprises at least two power supply buses and a tie line, wherein the tie line is divided into a plurality of sections, node relay switches are arranged at nodes of the sections, each section is connected with a power supply branch circuit, the power supply branch circuits supply power for users or supply power for the users after being further divided into a plurality of branch circuits, branch circuit ammeters with communication functions are arranged at the joints of the power supply branch circuits and the tie line, each node of the tie line is provided with the relay protection device and comprises a communication module, a clock, an ammeter, a memory and a controller, the ammeter measures the current of the node of the tie line, the memory stores a unique number and a node sequence relation, the clock provides a current timestamp, the communication module is in communication connection with the branch circuit ammeters, and the communication module, the clock, the memory and the ammeter are all connected with the controller, the controller is connected with the control end of the relay switch.
Preferably, the communication module is a wireless communication module. The wireless communication module is convenient to deploy.
Preferably, the method comprises the following steps: A) the controller judges the superior-inferior relation according to the tide direction and the node sequence relation; B) when the fault current is detected, the controller executes the following judgment, if the node where the relay protection device is located has no lower node, the controller directly sends out a relay protection action command, disconnects the node, sends out action signals to the relay protection devices at all the upper nodes, and if the node where the relay protection device is located has the lower node, the step C is carried out; C) after waiting for the time T, judging that the relay protection device is locked and the node is kept on if the action signal of the relay protection device at any one level of lower node is received within the time T, and sending a relay protection action command and disconnecting the node if the action signal of the relay protection device at any lower node is not received within the time T. Through active communication, the position of the fault current can be accurately judged, the branch circuit removal is more selective, and the accident expansion is effectively avoided.
Preferably, the relay protection devices at nodes with more lower nodes wait for a longer time T.
Preferably, in the step a, the method for determining the direction of the power flow specifically includes: A1) the controller reads the current value measured by the ammeter, and the controller sends the unique number, the current value and the timestamp as information packets in a broadcasting mode; A2) the controller receives information packets sent by the relay protection devices at nodes on two sides, and simultaneously reads values of branch ammeter on two sides of the nodes; A3) and respectively calculating the difference between the current value measured by the relay protection devices on two sides and the measured value of the branch ammeter, wherein the relay protection device on one side with the difference value closer to the current value read by the current controller is the superior stage of the current relay protection device, the relay protection device on one side with the difference value being negative is the subordinate stage of the current relay protection device, and the difference values on two sides are positive, so that the relay protection device has no subordinate relay protection device. The upper and lower level relations can be accurately judged through current comparison, and the method has a real-time judging function, so that the judgment of the tidal current direction is more accurate.
Preferably, the method for sending the operation signals to the relay protection devices at all the upper nodes specifically includes the following steps: B1) after the superior-subordinate relation is determined, each relay protection device stores the unique serial numbers of all subordinate relay protection devices; B2) a controller of the relay protection device reads a current value measured by an ammeter, and sends the unique number, the current value and a timestamp as information packets in a broadcast mode at a period t; B3) the controller of the relay protection device checks the upper and lower level relations, and if the upper and lower level relations are checked to be wrong, the upper and lower level relations are judged again; B4) when the relay protection device without the subordinate relay protection device detects fault current, the node is disconnected, the broadcasting of the information packet is stopped, and if all the superior relay protection devices of the relay protection device do not receive the information packet broadcasted by the relay protection device for two continuous periods t, the action signal of the relay protection device is considered to be received.
Preferably, step C specifically comprises: when the relay protection device with the subordinate relay protection device detects fault current, the broadcast information packet is stopped, two periods t are waited, if all subordinate relay protection devices keep the broadcast information packet in the two periods t, the relay protection device disconnects the node, and if the subordinate relay protection devices do not broadcast the information packet in the two periods t, the relay protection device is considered to receive an action signal of the subordinate relay protection device, and the node is locked and protected, and kept to be connected.
When the relay protection device with the subordinate relay protection device detects fault current, the broadcast information packet is stopped, two periods t are waited, if all subordinate relay protection devices keep the broadcast information packet in the two periods t, the relay protection device disconnects the node, and if the subordinate relay protection devices do not broadcast the information packet in the two periods t, the relay protection device is considered to receive an action signal of the subordinate relay protection device, and the node is locked and protected, and kept to be connected. The preferred scheme adopts the information packet required by the trend judgment and periodically broadcasts and sends the information packet, and can bring the following beneficial effects: multiplexing information packets, so that the information packets are used for transmitting current information to be used for judging the direction of the power flow, and transmitting action protection signals to be used for judging the position of a fault branch; the periodic communication is maintained, when the communication module fails, the failure can be timely found, and the phenomenon that when the failure current occurs, the communication module is damaged and cannot transmit action information timely, so that the misoperation of a superior relay protection device is caused, and the accident is enlarged is avoided; the broadcasting stop information packet is used as an action signal, so that the problems of wireless communication delay and communication channel blockage are avoided skillfully.
Preferably, the method further comprises the step D) of judging the upper-level and lower-level relations again by the relay protection device at the node which is kept connected after the fault current disappears, and executing the step B-C; and the relay protection device at the node disconnection part uploads the node position to the power distribution network maintenance center through the communication module. When the fault branch is cut off, the relay protection devices at the un-disconnected nodes form new protection again; the node disconnection position is sent to a power distribution network maintenance center, the fault position can be conveniently located, and maintenance efficiency is improved.
Preferably, step B2 further includes: and if the broadcast information packet of the next relay protection device is not received by a certain relay protection device within two continuous periods t and the fault current is not detected by the ammeter of the relay protection device, the unique serial number of the relay protection device without the broadcast information packet is sent to the distribution network maintenance center. The communication module that can in time discover to break down overhauls.
Preferably, the controller also performs the following steps: receiving the current value of the relay protection device at the adjacent node on one side, and calculating the sum and difference of the current values obtained by the relay protection device at the current node and the relay protection device at the adjacent node on the side, and taking the absolute value; reading the side branch ammeter measured value; if the measured value of the branch ammeter is not equal to the sum value and not equal to the absolute value of the difference value, the branch is judged to have electric leakage, and the position of the branch is reported to the distribution network maintenance center. This preferred scheme can assist and judge branch road electric leakage trouble.
The substantial effects of the invention are as follows: the tide direction is judged by periodically broadcasting the current value, and meanwhile, the broadcasting stopping current value is used as an action signal, so that the time consumed by the action of cutting is reduced in two broadcasting periods; the position of the fault branch can be judged through the action signal, so that the fault branch can be cut off in a targeted manner, and the expansion of accidents is avoided; when no fault current occurs, the current value is periodically broadcasted, so that a communication module with a fault can be found in time and replaced in time, and the accident expansion caused by the damage of the communication module is avoided; the non-received periodic broadcast signal is used as the action information, so that the delay of each stage in wireless communication can be offset, the transmission of the action signal is not influenced by communication delay, the removal of a fault branch is accelerated, and the safe and stable operation of a power grid is effectively guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a relay protection device according to an embodiment.
Fig. 2 is a schematic diagram of a deployment position of a relay protection device in a ring power distribution network according to an embodiment.
Fig. 3 is a block diagram of a control method of a relay protection device according to an embodiment.
Wherein: 100. ammeter, 200, memory, 300, communication module, 400, controller, 500, clock.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The first embodiment is as follows:
the utility model provides an automatic direction is differentiateed's relay protection device of ring-type distribution network, the ring-type distribution network includes two at least power supply bus and a junctor, the junctor is divided into a plurality of sections, node relay switch is installed to the node of section and section, as shown in fig. 2, node 563-1, node 563-2, node 001, node 654-2, node 654-1 and node 654, the junctor of connecting A bus and B bus is divided into four sections, wherein node 563 and node 654 are bus bar exit switch, power supply branch road is all connected to every section, power supply branch road is divided into a plurality of branch roads again, the trend on the branch road is one-way trend, its relay protection scheme can refer to this embodiment and implement. The branch ammeter 100 with a communication function is installed at the connection of each power supply branch and a tie line, relay protection devices are arranged on nodes 563, 563-1, 563-2, 001, 654-2, 654-1 and 654 on the tie line, as shown in fig. 1, in this embodiment, each relay protection device includes a communication module 300, a clock 500, the ammeter 100, a memory 200 and a controller 400, the ammeter 100 measures the current of the tie line node, a unique number and a node sequence relationship are stored in the memory 200, the clock 500 provides a current timestamp, the communication module 300 is in communication connection with the branch ammeter 100, the communication module 300, the clock 500, the memory 200 and the ammeter 100 are all connected with the controller 400, and the controller 400 is connected with a control end of a relay switch. The clock 500 may be an external clock, or the clock 500 may be provided in the controller 400. The communication module 300 is a wireless communication module 300. The ZigBee technology with low power consumption can be adopted, and the transmission rate of the ZigBee is enough to be implemented by the embodiment.
A method for controlling a relay protection device of a ring network for automatically determining a direction as described above, as shown in fig. 3, includes the following steps: A) the controller 400 determines the superior-inferior relationship according to the power flow direction and the node sequence relationship. The method specifically comprises the following steps: A1) the controller 400 reads the current value measured by the ammeter 100, and the controller 400 transmits the unique number, the current value and the time stamp as information packets in a broadcast manner; A2) the controller 400 receives information packets sent by relay protection devices at nodes on two sides, and the controller 400 simultaneously reads the values of the branch ammeter 100 at two sides of the nodes; A3) and respectively calculating the difference between the current value measured by the relay protection devices on the two sides and the measured value of the branch current meter 100, wherein the relay protection device on one side with the difference value closer to the current value read by the current controller 400 is the superior stage of the current relay protection device, the relay protection device on one side with the difference value being negative is the inferior stage of the current relay protection device, and the difference values on the two sides are positive, so that the relay protection device has no inferior relay protection device. The upper and lower level relations can be accurately judged through current comparison, and the method has a real-time judging function, so that the judgment of the tidal current direction is more accurate.
B) When a fault current is detected, the controller 400 performs the following steps: B1) after the superior-subordinate relation is determined, each relay protection device stores the unique serial numbers of all subordinate relay protection devices; B2) the controller 400 of the relay protection device reads the current value measured by the ammeter 100, and sends the unique number, the current value and the timestamp as information packets in a broadcast manner in a period t, and if a certain relay protection device does not receive the broadcast information packet of the next relay protection device in two consecutive periods t and the ammeter 100 of the relay protection device does not detect fault current, the unique number of the relay protection device which does not broadcast the information packet is sent to the distribution network maintenance center. The communication module 300 with faults can be found in time and maintained in time; B3) the controller 400 of the relay protection device checks the relationship between the upper level and the lower level, and if the relationship between the upper level and the lower level is checked incorrectly, the relationship between the upper level and the lower level is judged again; B4) when the relay protection device without the subordinate relay protection device detects fault current, the node is disconnected, the broadcasting of the information packet is stopped, and if all the superior relay protection devices of the relay protection device do not receive the information packet broadcasted by the relay protection device for two continuous periods t, the action signal of the relay protection device is considered to be received.
C) When the relay protection device with the subordinate relay protection device detects fault current, the broadcast information packet is stopped, two periods t are waited, if all subordinate relay protection devices keep the broadcast information packet in the two periods t, the relay protection device disconnects the node, and if the subordinate relay protection devices do not broadcast the information packet in the two periods t, the relay protection device is considered to receive an action signal of the subordinate relay protection device, and the node is locked and protected, and kept to be connected.
D) When the fault current disappears, the relay protection device at the conducted node is kept to judge the upper-level and lower-level relations again, and the steps B-C are executed; the relay protection device at the node disconnection point uploads the node position to the distribution network maintenance center through the communication module 300. When the fault branch is cut off, the relay protection devices at the un-disconnected nodes form new protection again; the node disconnection position is sent to a power distribution network maintenance center, the fault position can be conveniently located, and maintenance efficiency is improved.
The controller 400 also performs the following steps: receiving the current value of the relay protection device at the adjacent node on one side, and calculating the sum and difference of the current values obtained by the relay protection device at the current node and the relay protection device at the adjacent node on the side, and taking the absolute value; reading the side branch ammeter 100 measurement; if the measured value of the branch ammeter 100 is not equal to the sum value or the absolute value of the difference value, it is determined that the branch has electric leakage, and the position of the branch is reported to the distribution network maintenance center. This preferred scheme can assist and judge branch road electric leakage trouble.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. A relay protection device of a ring-shaped power distribution network capable of automatically judging the direction comprises at least two power supply buses and a connecting line, wherein the connecting line is divided into a plurality of sections, node relay switches are arranged at the nodes of the sections, each section is connected with a power supply branch circuit, the power supply branch circuits supply power for users or supply power for the users after being further divided into a plurality of branch circuits, branch current meters with communication functions are arranged at the joints of the power supply branch circuits and the connecting line, and each node of the connecting line is provided with the relay protection device,
the communication module is in communication connection with the branch ammeter, the communication module, the clock, the memory and the ammeter are all connected with the controller, and the controller is connected with a control end of the relay switch;
the control method of the annular power distribution network relay protection device capable of automatically judging the direction comprises the following steps of:
A) the controller judges the superior-inferior relation according to the tide direction and the node sequence relation;
B) when the fault current is detected, the controller executes the following judgment, if the node where the relay protection device is located has no lower node, the controller directly sends out a relay protection action command, disconnects the node, sends out action signals to the relay protection devices at all the upper nodes, and if the node where the relay protection device is located has the lower node, the step C is carried out;
C) after waiting for the time T, judging that the relay protection device is locked and the node is kept on if the action signal of the relay protection device at any one level of lower node is received within the time T, and sending a relay protection action command and disconnecting the node if the action signal of the relay protection device at any lower node is not received within the time T.
2. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
the communication module is a wireless communication module.
3. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
in the step a, the method for determining the power flow direction specifically includes:
A1) the controller reads the current value measured by the ammeter, and the controller sends the unique number, the current value and the timestamp as information packets in a broadcasting mode;
A2) the controller receives information packets sent by the relay protection devices at nodes on two sides, and simultaneously reads values of branch ammeter on two sides of the nodes;
A3) and respectively calculating the difference between the current value measured by the relay protection devices on two sides and the measured value of the branch ammeter, wherein the relay protection device on one side with the difference value closer to the current value read by the current controller is the superior stage of the current relay protection device, the relay protection device on one side with the difference value being negative is the subordinate stage of the current relay protection device, and the difference values on two sides are positive, so that the relay protection device has no subordinate relay protection device.
4. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
the method for sending the action signals to the relay protection devices at all the superior nodes specifically comprises the following steps:
B1) after the superior-subordinate relation is determined, each relay protection device stores the unique serial numbers of all subordinate relay protection devices;
B2) a controller of the relay protection device reads a current value measured by an ammeter, and sends the unique number, the current value and a timestamp as information packets in a broadcast mode at a period t;
B3) the controller of the relay protection device checks the upper and lower level relations, and if the upper and lower level relations are checked to be wrong, the upper and lower level relations are judged again;
B4) when the relay protection device without the subordinate relay protection device detects fault current, the node is disconnected, the broadcasting of the information packet is stopped, and if all the superior relay protection devices of the relay protection device do not receive the information packet broadcasted by the relay protection device for two continuous periods t, the action signal of the relay protection device is considered to be received.
5. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
the step C is specifically as follows: when the relay protection device with the subordinate relay protection device detects fault current, the broadcast information packet is stopped, two periods t are waited, if all subordinate relay protection devices keep the broadcast information packet in the two periods t, the relay protection device disconnects the node, and if the subordinate relay protection devices do not broadcast the information packet in the two periods t, the relay protection device is considered to receive an action signal of the subordinate relay protection device, and the node is locked and protected, and kept to be connected.
6. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
step D) when the fault current disappears, the relay protection device at the conducting node is kept to judge the upper-level and lower-level relations again, and the steps B-C are executed; and the relay protection device at the node disconnection part uploads the node position to the power distribution network maintenance center through the communication module.
7. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 4,
step B2 further includes: and if the broadcast information packet of the next relay protection device is not received by a certain relay protection device within two continuous periods t and the fault current is not detected by the ammeter of the relay protection device, the unique serial number of the relay protection device without the broadcast information packet is sent to the distribution network maintenance center.
8. The relay protection device for the ring distribution network capable of automatically judging the direction according to claim 1,
the controller also executes the following steps:
receiving the current value of the relay protection device at the adjacent node on one side, and calculating the sum and difference of the current values obtained by the relay protection device at the current node and the relay protection device at the adjacent node on the side, and taking the absolute value; reading the side branch ammeter measured value;
if the measured value of the branch ammeter is not equal to the sum value and not equal to the absolute value of the difference value, the branch is judged to have electric leakage, and the position of the branch is reported to the distribution network maintenance center.
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