CN210894563U - Direct current looped netowrk on-line monitoring system - Google Patents
Direct current looped netowrk on-line monitoring system Download PDFInfo
- Publication number
- CN210894563U CN210894563U CN201921510762.0U CN201921510762U CN210894563U CN 210894563 U CN210894563 U CN 210894563U CN 201921510762 U CN201921510762 U CN 201921510762U CN 210894563 U CN210894563 U CN 210894563U
- Authority
- CN
- China
- Prior art keywords
- loop
- bus
- current
- section
- storage battery
- 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
Abstract
The utility model relates to an electric power control technical field specifically discloses a direct current looped netowrk on-line monitoring system, monitoring system includes: the system comprises a first section of bus, a first charger loop, a first storage battery loop, a second section of bus, a second charger loop and a second storage battery loop; the bus coupling loop is connected with the first section of bus and the second section of bus through a bus coupling switch; the bus coupler switch is provided with a position auxiliary contact for acquiring the opening and closing state of the bus coupler switch; the voltage acquisition system is used for respectively detecting the voltages of the first section of bus and the second section of bus; and the current acquisition system is used for respectively detecting the current of the charger loop I, the charger loop II, the storage battery loop I and the storage battery loop II. The utility model provides a direct current looped netowrk on-line monitoring system can be used to judge effectively fast whether there is the direct current looped netowrk, improves and differentiates efficiency and the discrimination degree of accuracy, guarantees electric wire netting system's steady operation.
Description
Technical Field
The utility model relates to an electric power control technical field especially relates to a direct current looped netowrk on-line monitoring system.
Background
In an electric power system, a power plant, a transformer substation and a communication machine room all adopt a direct current system to provide reliable working and power supplies for relay protection devices, control loops, monitoring equipment, communication equipment and the like in the station. The direct current system plays an important role in safe and stable operation of electric power infrastructure, and mainly comprises a charger, a storage battery pack, a direct current bus, a monitor, a switching (connecting) handle, a feeder unit and the like.
Related regulations have a clear text to prohibit the direct current system from running in a looped network, that is, when two groups of storage batteries and chargers are put into operation, each group of storage batteries and the corresponding charger, direct current bus and load must run independently. There cannot be any communication between the two systems. The direct current protection system aims to prevent serious problems that when one set of direct current system is grounded or short-circuited, if two sets of systems have looped networks, the other set of systems is also instantaneously grounded or short-circuited under the condition of being involved, so that the two sets of direct current systems of the total station lose voltage simultaneously to cause protection misoperation or operation rejection and the like.
However, the number of load outgoing lines of the direct current system is large, the direct current system is distributed all over the total station, and the two direct current systems are easy to be communicated in series to form a ring network. In order to ensure power supply, important direct current loads are double wiring of two sets of systems, one set of direct current system is selected to be adopted for power supply by utilizing the on-off of direct current air switch, and the other set of direct current system is reserved. Once the air switch is misdropped, a ring network is formed. The direct current looped network is very hidden, has no sign in normal operation, and is usually discovered after an accident event occurs, for example, two sets of direct current systems are grounded or lose voltage simultaneously due to grounding or losing voltage of one set of direct current systems. Or the existence of the looped network can be found only when a parasitic loop is found through power failure inspection.
In summary, at present, a running direct current system cannot realize online detection of whether looped networks exist, completely depends on manual operation and experience, and is low in efficiency, low in speed, high in error probability and short of effective technical means. If two sets of systems are always in a ring network operation state, once a certain set of system fails, the two sets of systems can fail at the same time, and the safety of the power system is seriously threatened.
Therefore, there is an urgent need to develop an on-line monitoring system for a dc ring network, which is used to quickly and effectively determine whether the dc ring network exists.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current looped netowrk on-line monitoring system can be used to judge effectively fast whether there is the direct current looped netowrk, improves and differentiates efficiency and the discrimination degree of accuracy, guarantees electric wire netting system's steady operation.
For reaching above purpose, the utility model provides a direct current looped netowrk on-line monitoring system, include:
the first direct current system comprises a first section of bus, a first charger loop and a first storage battery loop, wherein the first charger loop and the first storage battery loop are connected into the first section of bus in parallel;
the second direct-current system comprises a second section of bus, a second charger loop and a second storage battery loop, wherein the second charger loop and the second storage battery loop are connected into the second section of bus in parallel;
the bus coupling loop is connected with the first section of bus and the second section of bus through a bus coupling switch; the bus coupler switch is provided with a position auxiliary contact for acquiring the opening and closing state of the bus coupler switch;
the voltage acquisition system is used for respectively detecting the voltages of the first section of bus and the second section of bus;
the current acquisition system is used for respectively detecting the current of the first charger loop, the second charger loop, the first storage battery loop and the second storage battery loop.
Preferably, the voltage acquisition system comprises a first voltage transformer connected in parallel to the first section of bus and a fourth voltage transformer connected in parallel to the second section of bus.
Preferably, the current collection system comprises a first current transformer connected in series to the first charger loop, a second current transformer connected in series to the first storage battery loop, a third current transformer connected in series to the main circuit of the first charger loop and the first storage battery loop, a fourth current transformer connected in series to the second charger loop, a fifth current transformer connected in series to the second storage battery loop, and a sixth current transformer connected in series to the main circuit of the second charger loop and the second storage battery loop.
Preferably, the device further comprises a processing chip and an alarm device, wherein the processing chip is electrically connected with the current acquisition system and the alarm device respectively.
Preferably, the monitoring system further comprises a printing device for printing the monitoring report, and the processing chip is electrically connected with the printing device.
The beneficial effects of the utility model reside in that: the direct current looped network online monitoring system can be used for quickly and effectively judging whether a direct current looped network exists, the judging efficiency and the judging accuracy are improved, and the stable operation of a power grid system is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the present embodiment or the prior art, the drawings needed to be used in the description of the embodiment or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of an on-line monitoring system of a dc loop network according to an embodiment of the present invention;
fig. 2 is a block diagram of a dc ring network online monitoring system provided in the embodiment of the present invention;
fig. 3 is a flowchart of a dc ring network online monitoring method provided by the second embodiment of the present invention;
fig. 4 is a flowchart of a dc ring network online monitoring method provided by the third embodiment of the present invention.
In the figure:
101. i, a section of bus; 102. i, a charging unit; 103. i, a storage battery pack;
201. II sections of buses, 202 and II charging units; 203. II, a storage battery pack;
301. a first voltage transformer; 302. a second voltage transformer; 303. a third voltage transformer; 304. a fourth voltage transformer; 305. a fifth voltage transformer; 306. a sixth voltage transformer;
401. a first current transformer; 402. a second current transformer; 403. a third current transformer; 404. a fourth current transformer; 405. a fifth current transformer; 406. a sixth current transformer; 407. a seventh current transformer;
501. i, a charging switch; 502. i, a power storage switch; 503. II, a charging switch; 504. II, a power storage switch; 505. a bus tie switch;
6. processing the chip; 7. an alarm device; 8. a printing apparatus.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is apparent that the embodiments described below are only some but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
The embodiment of the present invention provides a direct current looped netowrk on-line monitoring system can be used to carry out the embodiment of the present invention provides a direct current looped netowrk on-line monitoring method, possesses corresponding function and beneficial effect.
Referring to fig. 1 to 2, an on-line monitoring system for a dc loop network includes a first dc system, a second dc system, a bus tie loop, a voltage collecting system, and a current collecting system.
The first direct current system comprises a first-section bus 101, a first charger loop and a first storage battery loop, wherein the first charger loop and the first storage battery loop are connected into the first-section bus 101 in parallel. The second direct current system comprises a second section of bus 201, a second charger loop and a second storage battery loop, wherein the second charger loop and the second storage battery loop are connected into the second section of bus 201 in parallel. The bus coupling loop is connected with the first section of bus 101 and the second section of bus 201 through a bus coupling switch 505; the bus tie switch 505 is provided with a position auxiliary contact for acquiring the opening and closing state of the bus tie switch. The voltage acquisition system is used for respectively detecting the voltages of the first section of bus 101, the first charger loop, the first storage battery loop, the second section of bus 201, the second charger loop and the second storage battery loop. The current acquisition system is used for respectively detecting the currents of a main circuit of a charger I, a storage battery I, a main circuit of the charger I and the storage battery I, a main circuit of a charger II, a storage battery II, a main circuit of the charger II and the storage battery II, and a bus coupler circuit seven. In FIG. 1, + -KM 1 is a first-stage busbar 101, and + -KM 2 is a second-stage busbar 201. The I charger loop is provided with the I charging set 102, the I storage battery loop is provided with the I storage battery set 103, the II charger loop is provided with the II charging set 202, and the II storage battery loop is provided with the II storage battery set 203.
Specifically, the voltage acquisition system comprises a first voltage transformer 301 connected in parallel to the first section of bus 101, a second voltage transformer 302 connected in parallel to the first section of battery charger loop, a third voltage transformer 303 connected in parallel to the first section of battery charger loop, a fourth voltage transformer 304 connected in parallel to the second section of bus 201, a fifth voltage transformer 305 connected in parallel to the second section of battery charger loop, and a sixth voltage transformer 306 connected in parallel to the second section of battery charger loop.
The current acquisition system comprises a first current transformer 401 connected in series with a loop of the I charger, a second current transformer 402 connected in series with a loop of the I storage battery, a third current transformer 403 connected in series with a trunk of the loop of the I charger and the loop of the I storage battery, a fourth current transformer 404 connected in series with a loop of the II charger, a fifth current transformer 405 connected in series with a loop of the II storage battery, a sixth current transformer 406 connected in series with a trunk of the loop of the II charger and the loop of the II storage battery, and a seventh current transformer 407 connected in series with a bus tie loop.
It can be understood that the voltage acquisition system and the current acquisition system are both secondary devices of a direct current system, and are used for acquiring current flow and voltage values of each point.
For a first direct current system, a first section of bus 101 is used for collecting and transmitting power to each feeder line; the I storage battery pack 103 stores electricity as a standby power supply of the I section of bus 101, and when the I charging unit 102 fails, energy with a certain capacity is provided for the I section of bus 101, so that the direct current load is guaranteed to keep normal operation within a certain time; the I charging set 102 is used for providing power for the I section of bus 101 in real time during normal operation, meanwhile, the I storage battery pack 103 is subjected to floating charging, and after charging is finished, the I storage battery pack 103 is uniformly charged for keeping full energy storage of the I storage battery pack 103 for standby. The second dc system has the same process, and is not described herein again.
It should be noted that, the floating charge is a power supply (discharge) operation mode of the storage battery pack, i.e. the storage battery pack and the charger are connected to a load circuit, the output voltage of the charger is only slightly higher than the terminal voltage of the storage battery pack, and a small amount of charging current compensates the loss of the storage battery pack due to local action, so that the storage battery pack can be always kept in a charging satisfied state without overcharging; the charge equalization means that the charger automatically raises the output voltage (for example, a 110V dc system, the charging voltage is increased by 5.2V when the charger equalizes charge compared with the floating charge) at intervals (generally, 9 days), the storage battery is charged significantly (the charging current is increased significantly), and the storage battery is ensured to be in a full capacity state. The uniform charging can be automatically carried out by setting a fixed time limit, and can also be forcibly started at any time.
The monitoring method provided by the second embodiment and the monitoring method provided by the third embodiment make full use of the characteristics that the charger of the monitoring system provided by the present embodiment can automatically or forcibly charge uniformly, the output voltage is raised and the output current is obviously increased during charging uniformly, and then whether a direct current ring network exists is accurately judged.
The direct current looped network on-line monitoring system further comprises a processing chip 6, an alarm device 7 and a printing device 8 used for printing a detection report, wherein the processing chip 6 is respectively electrically connected with the voltage acquisition system, the current acquisition system, the alarm device 7 and the printing device 8 and is used for calculating and judging monitoring results of the voltage acquisition system and the current acquisition system to obtain a conclusion whether the direct current looped network exists, and if the direct current looped network exists, the printing device 8 is controlled to print the monitoring report and send an alarm instruction to the alarm device 7.
Preferably, the alarm device 7 may be a warning lamp, a buzzer, a smartphone or other equipment with a warning function, and may emit warning information such as characters, flashing lights, sounds, vibrations, and the like.
Preferably, the I charger loop is provided with an I charging switch 501, the I storage battery loop is provided with an I storage battery switch 502, the II charger loop is provided with an II charging switch 503, and the II storage battery loop is provided with an II storage battery switch 504.
When the system runs normally, the I charging set 102 and the I storage battery set 103 are communicated with the I section of bus 101, the II charging set 202 and the II storage battery set 203 are communicated with the II section of bus 201, the bus coupler switch 505 is in an off state, other switches are in a closed state, and two sets of direct current systems run in a row. In some cases, when one of the batteries needs to be removed from operation (such as maintenance or nuclear capacity), the bus-bar switch 505 is closed, and at this time, the two sets of systems operate in parallel, and the storage switch corresponding to the battery pack is opened, so that the battery pack is isolated from the systems, and the operation is removed. Similarly, when one of the charging units needs to quit operation (such as maintenance or nuclear capacity), the bus tie switch 505 is closed, and at this time, the two sets of systems operate in parallel, and the charging switch corresponding to the charging unit is disconnected, and the charging unit is isolated from the systems and quits operation.
The dc ring network online monitoring system provided in this embodiment may be used in the dc ring network online monitoring method provided in the second embodiment or the third embodiment, and may quickly and effectively determine whether a dc ring network exists.
Example two
The embodiment provides an on-line monitoring method for a direct current ring network, which is applicable to application scenes in the field of power monitoring and can improve the efficiency of monitoring the operation of a power grid.
Referring to fig. 3, the dc loop network online monitoring method includes the following steps:
s201: the voltage U1 of the first section of the bus 101, the voltage U2 of the second section of the bus 201, the current Ic1 of the first charger loop, the current Ic2 of the second charger loop, the current Ix1 of the first storage battery loop and the current Ix2 of the second storage battery loop are monitored.
S202: when the bus coupler switch 505 is in an off state and the I storage battery loop is changed from floating charging to uniform charging, judging whether a direct-current looped network exists according to the change conditions of the voltage U1 of the I section bus 101, the voltage U2 of the II section bus 201, the current Ic1 of the I charger loop, the current Ic2 of the II charger loop, the current Ix1 of the I storage battery loop and the current Ix2 of the II storage battery loop.
Generally, two sets of direct current systems in the station operate in a split mode (the bus tie switch 505 is turned off, and the current Im of a bus tie loop is zero), and both storage battery packs are in a floating charge state. At intervals, the charging unit (the storage battery pack is automatically charged from floating charge to uniform charge (the uniform charge can be automatically put in, and also can be put in forcibly) is described by taking the first direct current system as an example, the second direct current system is the same as the first direct current system, when the first direct current system is uniformly charged from floating charge to uniform charge, the current output by the charging unit 102I is increased, the output voltage is increased, the voltage U1 of the section I bus 101 is increased along with the increase of the voltage U1 and generates a pressure difference with the section I storage battery pack 103, and a large current is formed to charge the storage battery pack, at the moment:
s2021 a: if the variation values of the voltage U2 of the II-section bus 201, the current Ic2 of the II charger loop and the current Ix2 of the II storage battery loop are all within an allowable error range; and/or if the difference value between the increment delta Ic1 of the current Ic1 of the I charger loop and the increment delta Ix1 of the current Ix1 of the I storage battery loop is within an allowable error range, the first direct current system and the second direct current system do not have looped networks.
It can be understood that the voltage U2 of the second-stage bus 201, the current Ic2 of the ii charger loop, and the current Ix2 of the ii battery loop are all within an allowable error range, that is, U2, Ic2, and Ix2 are basically kept unchanged, which indicates that the second dc system is not affected by the first dc system, so that no dc loop exists.
The difference between the increase amount Δ Ic1 of the current Ic1 of the i charger loop and the increase amount Δ Ix1 of the current Ix1 of the i battery loop is within the allowable error range, that is, Δ Ic1 ≈ Δ Ix1, which indicates that all the current flowing from the i charging set 102 flows through the i battery set 103, so that no direct current loop network exists.
S2022 a: if the voltage U2 of the second-section bus 201 is instantly increased to be consistent with the voltage U1 of the first-section bus 101, namely the difference value between the delta U1 and the delta U2 is within an allowable error range; and/or the difference value between (delta Ic 1-delta Ix1) and (delta Ix 2-delta Ic2) is within an allowable error range, and the looped network exists in the first direct current system and the second direct current system.
It can be understood that if the voltage U2 of the second-segment bus 201 is instantaneously raised to be consistent with the voltage U1 of the first-segment bus 101, that is, Δ U1 ≈ Δ U2, it indicates that there is a path between the second-segment bus 201 and the first-segment bus 101, and the buscouple switch 505 is in an open state, so that there is a dc loop.
The difference between (Δ Ic1- Δ Ix1) and (Δ Ix2- Δ Ic2) is within the allowable error range, i.e., (Δ Ic1- Δ Ix1) ≈ Δ Ix2- Δ Ic 2. The current increment of the I charging set 102 is nearly half of the current increment, the current is reversely transmitted to the II section of bus 201 through the looped network, the II section of bus 201 is boosted, meanwhile, the II storage battery pack 203 is uniformly charged, and the I charging set 102 is equivalent to uniformly charging two storage battery packs at the same time. Therefore, the current of the ii battery pack 203 increases, and the current output by the ii charging unit 202 decreases, according to kirchhoff's current law, at this time, Δ Ic1- Δ Ix1 is Δ Ix2- Δ Ic2 (where Δ Ic2 is a negative value), considering that a small increase in the bus voltage does not greatly affect the load current, an allowable error range may be set for judgment, that is, (Δ Ic1- Δ Ix1) ≈ (Δ Ix2- Δ Ic2), it is considered that a dc loop network exists.
In summary, when the bus tie switch 505 is in the disconnection state, the i battery pack 103 is uniformly charged from the float charge, and there are two judgment bases, namely voltage and current, which can be used for judging whether a ring network exists between two sets of systems, and it can be judged that the ring network exists when any one condition is satisfied.
In order to prevent the occurrence of the event of misreporting the ring network or failing to report the ring network due to the fact that the fault of the voltage transformer or the current transformer in the direct current system causes the incorrect acquisition, the embodiment combines the two conditions of voltage and current, and increases the judgment basis of the duration time to perform comprehensive judgment. That is, when only one condition of current and voltage is satisfied, a longer first time period T1 is required to alarm, and when both conditions of current and voltage are satisfied, a shorter second time period T2 is required to alarm.
An optimal strategy is implemented. The method comprises the following specific steps:
s2021 b: if the change values of the voltage U2 of the II section bus 201, the current Ic2 of the II charger loop and the current Ix2 of the II storage battery loop are all within an allowable error range and last for a first time length T1; or if the difference value between the increase amount delta Ic1 of the current Ic1 of the I charger loop and the increase amount delta Ix1 of the current Ix1 of the I storage battery loop is within the allowable error range and lasts for the first time length T1; or if the voltage U2 of the second section of the bus 201, the current Ic2 of the second charger loop and the current Ix2 of the second storage battery loop are all within an allowable error range, and the difference value between the increase quantity delta Ic1 of the current Ic1 of the first charger loop and the increase quantity delta Ix1 of the current Ix1 of the first storage battery loop is within the allowable error range and lasts for a second time length T2, the first direct current system and the second direct current system do not have looped networks; wherein TI is greater than T2;
s2022 b: if the voltage U2 of the second-section bus 201 is instantaneously raised to be consistent with the voltage U1 of the first-section bus 101, namely the difference value between the delta U1 and the delta U2 is within an allowable error range and lasts for a first time length T1; or the difference between (Δ Ic1- Δ Ix1) and (Δ Ix2- Δ Ic2) is within the allowable error range and lasts for the first time length T1; or, if the voltage U2 of the second-stage bus 201 instantaneously rises to be consistent with the voltage U1 of the first-stage bus 101, that is, the difference between Δ U1 and Δ U2 is within the allowable error range, and the difference between (Δ Ic1- Δ Ix1) and (Δ Ix2- Δ Ic2) is within the allowable error range, and lasts for the second time length T2, the first direct current system and the second direct current system have looped networks.
In the above steps, different allowable error ranges should be set in different occasions, and further, the smaller the allowable error range, the more easily the error is reported, the larger the allowable error range, the more easily the error is reported, and the allowable error ranges in different steps can be manually adjusted.
In this embodiment, when finding that the first dc system and the second dc system have the looped network, the warning message and the monitoring report may be sent to notify the power personnel, so as to remind the power personnel to correct the misoperation and eliminate the looped network communication point in time, thereby avoiding major accident event of total-station dc voltage loss.
The method for monitoring the direct current looped network on line provided by the embodiment can be used for monitoring the direct current looped network in the technical field of power monitoring, and can be used for rapidly judging whether the direct current looped network exists or not through the voltage and current change conditions of each loop, so that the statistical efficiency can be effectively improved, the labor is saved, the accuracy is improved, and the error is avoided.
EXAMPLE III
The embodiment provides an on-line monitoring method for a direct current ring network, which is applicable to application scenes in the field of power monitoring and can improve the efficiency of monitoring the operation of a power grid.
Referring to fig. 4, the dc loop network online monitoring method includes the following steps:
s301: the current Ic1 of the I charger loop, the current Ix1 of the I storage battery loop and the position auxiliary contact Fm of the bus tie switch 505 are monitored.
S302: when the I storage battery loop is in a floating charging state and the position state of the bus coupler switch 505 changes, judging whether a direct current looped network exists according to the current Im of the bus coupler loop, the current Ic1 of the I charger loop and the current Ix1 of the I storage battery loop.
In this embodiment, S302 includes:
s3021 a: when the bus-coupled switch 505 is switched from an open state to a closed state, if the variation value of the current Im of the bus-coupled loop is within an allowable error range; and/or when the bus coupler switch 505 is switched from a closed state to an open state, the difference value between the current Ic1 of the I charger loop and the current Ix1 of the I storage battery loop is within an allowable error range, and the first direct current system and the second direct current system do not have a looped network.
S3022 a: when the bus-coupled switch 505 is switched from an open state to a closed state, if the variation value of the current Im of the bus-coupled loop exceeds the allowable error range; and/or when the bus coupler switch 505 is switched from a closed state to an open state, the difference value between the current Ic1 of the I charger loop and the current Ix1 of the I storage battery loop exceeds an allowable error range, and the looped network exists in the first direct current system and the second direct current system.
Generally, when a group of storage batteries or charging units in a station needs to be removed from operation for maintenance or debugging, the switches need to be operated in sequence. The following description will be given by taking an example of the exit operation of the ii battery pack 203 and the ii charging unit 202 (the same exit from the i battery pack 103 and the i charging unit 102 is the same, and will not be described again):
①, firstly closing the bus-coupled switch 505, after closing the bus-coupled switch 505, the two sets of DC systems are converted from split operation to parallel operation, generally, if there is no DC looped network, because the voltages of the I section bus 101 and the II section bus 201 are similar, the current of the bus-coupled loop should be about zero, considering the actual line loss and other factors, an allowable error range can be added, namely, when the current variation value of the bus-coupled loop is in the allowable error range, it can be determined that there is no DC looped network, if there is one or more connection points (i.e. looped network operation) between the I section bus 101 and the second DC system, because the impedance of the bus-coupled switch 505 relative to the feeder looped network is very low, when the bus-coupled switch 505 is opened from split, most of the loop flow at the split position is split by the closed bus-coupled switch 505, at this time, the load current will generate a sudden change, namely, the current Im of the bus-coupled loop will be greater than the allowable error range.
② disconnects the II charging switch 503 corresponding to the II charging set 202 and the II storage switch 504 corresponding to the II storage battery set 203, and at the moment, the I charging set 102 and the I storage battery set 103 simultaneously supply power to the I section of bus 101 and the II section of bus 201;
③, overhauling or debugging the II storage battery pack 203 and the II charging unit 202;
④, after the overhaul or the debugging is finished, the II charging switch 503 and the II electric storage switch 504 are closed, and the two sets of direct current systems recover parallel operation;
⑤ before disconnecting the buscouple switch 505, the second storage battery pack 203 and the second charging unit 202 are counted into the second direct current system, the voltages of the first section bus 101 and the second section bus 201 are similar again, after the buscouple switch 505 is switched from closed to disconnected, the load current should not suddenly change, namely, Δ (Ic1-Ix1) is approximately equal to zero, preferably, a corresponding allowable error range can be set, when Δ (Ic1-Ix1) is in the allowable error range, it can be considered that no direct current looped network exists.
In summary, when the position of the buscouple switch 505 changes, two judgment bases exist for judging whether a ring network exists between two sets of systems, and the existence of the ring network can be judged when any one condition is met.
In order to prevent the occurrence of the event that the current transformer in the direct current system fails to correctly collect and causes the device to misjudge and finally reports the looped network incorrectly, the embodiment combines two conditions and increases the judgment basis of the duration time to carry out comprehensive judgment. That is, when only one condition is satisfied, a longer third time period T3 must elapse to alarm the exit, and when both conditions are satisfied, a shorter fourth time period T4 is reached to alarm the exit. An optimal strategy is implemented. The method comprises the following specific steps:
s302 may further include:
s3021 b: when the bus-bar switch 505 is switched from the breaking state to the closing state, the change value of the current Im of the bus-bar loop is within the allowable error range and lasts for a third time length T3; alternatively, the first and second electrodes may be,
when the busbar switch 505 is switched from a closed state to an open state, the difference value between the current Ic1 of the I charger loop and the current Ix1 of the I storage battery loop is within an allowable error range and lasts for a third time length T3; alternatively, the first and second electrodes may be,
when the bus tie switch 505 is switched from an open state to a closed state, the change value of the current Im of the bus tie loop is within an allowable error range, and when the bus tie switch 505 is switched from the closed state to the open state, the difference value between the current Ic1 of the charger loop I and the current Ix1 of the storage battery loop I is within the allowable error range, and lasts for a fourth time length T4, so that the first direct current system and the second direct current system do not have a looped network; wherein T3 > T4;
s3022 b: when the bus-bar switch 505 is switched from the breaking state to the closing state, the change value of the current Im of the bus-bar loop exceeds the allowable error range and lasts for a third time length T3; alternatively, the first and second electrodes may be,
when the bus coupler switch 505 is switched from a closed state to an open state, the difference value between the current Ic1 of the I charger loop and the current Ix1 of the I storage battery loop exceeds an allowable error range and lasts for a third time length T3; alternatively, the first and second electrodes may be,
when the bus tie switch 505 is switched from an open state to a closed state, the change value of the current Im of the bus tie loop exceeds an allowable error range, and when the bus tie switch 505 is switched from the closed state to the open state, the difference value between the current Ic1 of the charger loop I and the current Ix1 of the storage battery loop I exceeds the allowable error range, and lasts for a fourth time length T4, so that a looped network exists in the first direct current system and the second direct current system.
In the above steps, different allowable error ranges should be set in different occasions, and further, the smaller the allowable error range, the more easily the error is reported, the larger the allowable error range, the more easily the error is reported, and the allowable error ranges in different steps can be manually adjusted.
In this embodiment, when finding that the first dc system and the second dc system have the looped network, the warning message and the monitoring report may be sent to notify the power personnel, so as to remind the power personnel to correct the misoperation and eliminate the looped network communication point in time, thereby avoiding major accident event of total-station dc voltage loss.
In the embodiments provided in the present application, it should be understood that the disclosed system, unit, apparatus and method may be implemented in other ways. For example, all the embodiments described above are merely illustrative, and for example, the division of the above units or modules is only one logical function division, and there may be other divisions when the actual implementation is performed, for example, a plurality of units, modules and components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a computer-readable storage medium and includes instructions for causing a terminal device (which may be a mobile phone, a notebook, or other electronic device) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. The utility model provides a direct current looped netowrk on-line monitoring system which characterized in that includes:
the first direct current system comprises a first section of bus, a first charger loop and a first storage battery loop, wherein the first charger loop and the first storage battery loop are connected into the first section of bus in parallel;
the second direct-current system comprises a second section of bus, a second charger loop and a second storage battery loop, wherein the second charger loop and the second storage battery loop are connected into the second section of bus in parallel;
the bus coupling loop is connected with the first section of bus and the second section of bus through a bus coupling switch; the bus coupler switch is provided with a position auxiliary contact for acquiring the opening and closing state of the bus coupler switch;
the voltage acquisition system is used for respectively detecting the voltages of the first section of bus and the second section of bus;
the current acquisition system is used for respectively detecting the current of the first charger loop, the second charger loop, the first storage battery loop and the second storage battery loop.
2. The direct current looped network on-line monitoring system of claim 1, wherein the voltage acquisition system comprises a first voltage transformer connected in parallel to the first section of bus and a fourth voltage transformer connected in parallel to the second section of bus.
3. The direct current looped network on-line monitoring system as claimed in claim 1, wherein the current collection system comprises a first current transformer connected in series to the first charger loop, a second current transformer connected in series to the first battery loop, a third current transformer connected in series to the main circuit of the first charger loop and the first battery loop, a fourth current transformer connected in series to the second charger loop, a fifth current transformer connected in series to the second battery loop, and a sixth current transformer connected in series to the main circuit of the second charger loop and the second battery loop.
4. The direct current looped network on-line monitoring system of claim 1, further comprising a processing chip and an alarm device, wherein the processing chip is electrically connected with the current collection system and the alarm device respectively.
5. The direct current loop network online monitoring system of claim 4, further comprising a printing device for printing a monitoring report, wherein the processing chip is electrically connected to the printing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921510762.0U CN210894563U (en) | 2019-09-11 | 2019-09-11 | Direct current looped netowrk on-line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921510762.0U CN210894563U (en) | 2019-09-11 | 2019-09-11 | Direct current looped netowrk on-line monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210894563U true CN210894563U (en) | 2020-06-30 |
Family
ID=71339776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921510762.0U Active CN210894563U (en) | 2019-09-11 | 2019-09-11 | Direct current looped netowrk on-line monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210894563U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398667A (en) * | 2019-09-11 | 2019-11-01 | 广东电网有限责任公司 | A kind of looped network of DC power on-line monitoring system and method |
-
2019
- 2019-09-11 CN CN201921510762.0U patent/CN210894563U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398667A (en) * | 2019-09-11 | 2019-11-01 | 广东电网有限责任公司 | A kind of looped network of DC power on-line monitoring system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110794293A (en) | Method for detecting automatic nuclear capacity switch state of storage battery | |
| CN102664454A (en) | Non-floating charging type substation direct current power supply system based on iron lithium battery | |
| CN111342534A (en) | Storage battery discharge control system and control method thereof | |
| CN207481815U (en) | Electric system above and below electric automobile high-voltage | |
| CN112086955A (en) | Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof | |
| CN210894563U (en) | Direct current looped netowrk on-line monitoring system | |
| CN210894564U (en) | Direct current looped netowrk on-line monitoring system | |
| CN110398668A (en) | A kind of looped network of DC power on-line monitoring system and method | |
| CN218216809U (en) | Energy storage battery system | |
| CN204694790U (en) | A kind of Hall element fault monitoring device being applicable to nuclear power plant's ups system | |
| CN208571667U (en) | A kind of extension transformer substation communication equipment power-on time device | |
| CN202550664U (en) | Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery | |
| CN105429283B (en) | Electric power system for transformer station | |
| CN212304789U (en) | Energy storage battery double protection structure for energy storage system | |
| CN211296275U (en) | Energy storage system capable of automatically removing faults | |
| CN208971183U (en) | The safe discharge device for preventing DC bus from powering off | |
| CN208860936U (en) | A kind of open circuit afterflow of battery group and over-discharge alarm device | |
| CN203871888U (en) | Communication electricity-using apparatus of transformer station integrated power supply | |
| CN112152243A (en) | Lithium battery energy storage system and control method | |
| CN205583821U (en) | Portable modularization emergency repair alternating current -direct current integration power | |
| CN112798970A (en) | Remote capacity checking system for storage battery of transformer substation | |
| CN105811444B (en) | A kind of electric vehicle and power grid interactive simulation load system and its electrical protection method | |
| CN110398667A (en) | A kind of looped network of DC power on-line monitoring system and method | |
| CN216721006U (en) | Automatic input device for open circuit protection of storage battery pack of transformer substation | |
| CN217427761U (en) | Automatic access system of standby charger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |