CN210693533U - Open-circuit protection device for storage battery pack of transformer substation - Google Patents
Open-circuit protection device for storage battery pack of transformer substation Download PDFInfo
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- CN210693533U CN210693533U CN201921629152.2U CN201921629152U CN210693533U CN 210693533 U CN210693533 U CN 210693533U CN 201921629152 U CN201921629152 U CN 201921629152U CN 210693533 U CN210693533 U CN 210693533U
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- 238000010586 diagram Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
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Abstract
The utility model provides a transformer substation storage battery pack open-circuit protection device, transformer substation storage battery pack open-circuit protection device connect to the transmission line, still be connected with the load on the transmission line, wherein the transmission line includes positive pole line and negative pole line, transformer substation storage battery pack open-circuit protection device includes battery cell, direct current multicircuit switching unit and direct current steady voltage unit; the utility model discloses a multiunit storage battery, and multiunit storage battery is connected to the power transmission line through many option switch, like this when a set of battery wherein appears opening a way the trouble, many option switch over to next gear promptly, put through another storage battery, can guarantee the continuous power supply to the load, ensure the transformer substation, the DC power supply of power plant, communication power supply, important power such as UPS power lasts, supply power reliably, guarantee relay protection and automatic device correct action under the accident situation simultaneously, and then ensure that the holistic operation of transformer substation is normal and safe.
Description
Technical Field
The utility model relates to an electrical maintenance, power supply unit technical field, concretely relates to a device that is arranged in transformer substation to carry out open circuit protection to DC power supply's storage battery.
Background
With the continuous improvement of the overall level of the power system, a new generation of intelligent substation also puts higher requirements on a direct current power supply of the power system, wherein the direct current power supply system comprises all necessary power supply equipment such as a protection device, a device power supply of a safety automatic device, a control loop power supply, a communication power supply, a UPS power supply and the like. When the AC power supply of the transformer for the station is in power failure or the charger fails, the storage battery pack reversely provides reliable electric energy for the DC power supply system, if the storage battery pack is opened, the DC power supply system of the whole station is completely powered off, all the protection devices, the safety automatic device and the three remote functions are completely failed, and the safe and stable operation of a power grid is seriously threatened, so the open-circuit protection of the storage battery pack is a key technical problem faced by the DC power supply system, and the power supply reliability is directly influenced.
In recent years, the accident of the substation caused by the failure of the station power supply disappearing storage battery (high internal resistance, low voltage, insufficient capacity, open circuit of a bus between polar plates, open circuit of positive and negative poles and the like) is more frequent. Because the storage battery pack is open-circuited, the power supply can not continuously and reliably supply power to important load equipment such as a protection device, a safety automatic device, a control loop, a communication power supply, a UPS power supply and the like; in severe cases, the trip is out of step, which causes destructive loss to the transformer substation and the power plant.
As shown in fig. 1, the storage battery pack and the dc charging panel are directly connected to a power supply line, wherein the dc charging panel ensures power supply in a normal state and simultaneously charges the storage battery pack, and when the ac power supply of the transformer for the station is lost or the charger fails, the dc charging panel cannot supply power, and the storage battery pack starts to supply power. As shown in fig. 2, in the process of supplying power to the storage battery pack, if the storage battery pack normally operates, normal power supply to the load can be ensured, and if an open-circuit fault occurs, the dc power supply of the total station is powered off, all the various protection and automation devices are powered off, so that a large amount of damage is caused to the transformer substation, and a serious large-scale safety accident may be caused, resulting in a great loss.
Under this condition, the utility model aims at providing a transformer substation storage battery protection device that opens a way to improve direct current system wiring mode, reduce the electric wire netting tripping operation of stepping down, reduce the accident scope, improve the operation safety of transformer substation.
SUMMERY OF THE UTILITY MODEL
To exist not enough among the prior art, the utility model provides a transformer substation storage battery protection device that opens a way for solve current transformer substation storage battery because do not have the protective capability that opens a way, when the open circuit trouble appears, the condition that DC power supply outage, various safety protection and automation equipment shut down in the transformer substation will take place, thereby very big influence changes power station normal operating, probably causes great incident, causes the problem of serious loss.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a substation storage battery pack open-circuit protection device is connected to a power transmission line, a load is connected to the power transmission line, wherein the power transmission line comprises a positive electrode line and a negative electrode line, the open-circuit protection device of the storage battery pack of the transformer substation comprises a storage battery unit, a direct-current multi-circuit switching unit and a direct-current voltage stabilizing unit, the storage battery unit comprises a plurality of storage battery packs connected in series, the storage battery pack comprises one storage battery or is formed by connecting a plurality of storage batteries in series, the direct current multi-circuit switching unit comprises two multi-position selection switches, the number of selectable gears of the multi-position selection switches is the same as that of the storage battery packs and is respectively and correspondingly connected to the storage battery packs, the direct current voltage stabilizing unit is arranged between the multi-position selection switch and the power transmission line in series, and the direct current voltage stabilizing unit further comprises a direct current charging unit which is respectively connected with the positive electrode and the negative electrode of the whole storage battery connected with the storage battery units in series.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model comprises a plurality of groups of storage battery sets, and the plurality of groups of storage battery sets are connected to the power transmission line through a plurality of selector switches, when one group of storage batteries has open circuit fault, the plurality of selector switches are switched to the next gear, and another storage battery set is switched on, thus ensuring continuous power supply to the load, ensuring continuous and reliable power supply of important power supplies such as direct current power supplies, communication power supplies and UPS power supplies of transformer substations and power plants, simultaneously ensuring relay protection and correct action of automatic devices thereof under accident conditions, and further ensuring normal and safe operation of the whole transformer substations;
2. the utility model discloses in will switch to the storage battery of connection at next gear when certain storage battery appears opening a way the trouble, like this when overhauing, the storage battery return circuit that is located the storage battery the place ahead of operating condition all has the trouble scheduling problem of opening a way, can directly discover the fault point like this, convenient to overhaul and maintain.
Drawings
FIG. 1 is a prior art power supply circuit diagram for a battery pack;
FIG. 2 is a logic diagram of the operation of a prior art battery pack;
fig. 3 is a circuit diagram of the open circuit protection device for the storage battery pack of the present invention;
FIG. 4 is a block flow diagram of the present invention;
FIG. 5 is a logic diagram of the open circuit protection operation of the storage battery pack of the present invention;
fig. 6 is a specific circuit diagram of the dc multi-circuit switching unit according to the present invention;
in the figure: the device comprises a storage battery unit 1, a direct current multi-circuit switching unit 2, a direct current voltage stabilizing unit 3, a direct current charging unit 4, a load 5, a diode 6, a normally closed switch 7, a multi-position selection switch 21, a relay 22 and a high-frequency switching power supply 41.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.
Example (b):
as shown in fig. 3-6, the utility model provides a transformer substation storage battery protection device that opens a way, transformer substation storage battery protection device that opens a way connect in the power transmission line, still be connected with load 5 on the power transmission line, wherein the power transmission line includes positive pole line and negative pole line, transformer substation storage battery protection device that opens a way includes battery cell 1, direct current multicircuit switching unit 2, direct current steady voltage unit 3 and direct current charging unit 4. The direct current charging unit 4 and the storage battery unit 1 are connected to a power transmission line and supply power to the load 5, when the direct current charging unit 4 works normally, the direct current charging unit converts an alternating current power supply into direct current and supplies power to the load 5 while charging the storage battery unit 1, and when the alternating current power supply fails or the direct current charging unit 4 fails, the load 5 is supplied with power through the storage battery pack. In this embodiment, the dc charging unit 4 is a dc charging screen commonly used in large-scale power transformation equipment such as a substation.
In this embodiment, the battery unit 1 includes a plurality of battery packs connected in series, where the battery pack includes one battery or is formed by connecting a plurality of batteries in series, and in this embodiment, it is preferable that 108 batteries are included in total, and the battery packs are divided into two groups, each group includes 54 batteries connected in series, for convenience of description, the two groups of battery packs are set as a group a and a group B, where the group a includes batteries 1 to 54, the group B includes batteries 55 to 108, and output voltages of the two groups of battery packs are both 110V.
The dc multi-circuit switching unit 2 includes two multi-position selection switches 21, the number of selectable gears of the multi-position selection switches 21 is the same as the number of the storage battery pack and is respectively and correspondingly connected to the storage battery pack, that is, in this embodiment, the multi-position selection switch 21 is a two-position selection switch, and the two-position selection switch includes a movable contact and two stationary contacts, so as to implement the function of selecting and switching two gears.
In a preferred scheme, one ends of moving contacts of two multi-position selection switches 21 are respectively connected to a positive electrode line and a negative electrode line, wherein one ends of static contacts of the multi-position selection switches 21 connected with the positive electrode line are respectively and correspondingly connected to the negative electrode of each storage battery pack, one ends of the static contacts of the multi-position selection switches 21 connected with the negative electrode line are respectively and correspondingly connected to the positive electrode of each storage battery pack, a relay 22 is further connected in parallel to a circuit at one end of the static contact of each storage battery pack, and the relay 22 brakes the contact to move to the next static contact when acting. In this embodiment, the multi-position selection switch 21 connected to the positive line is set as a two-position selection switch a, and the multi-position selection switch 21 connected to the negative line is set as a two-position selection switch B, so that the first position of the storage battery pack a and the first position of the storage battery pack B, that is, the positive electrodes of the storage battery pack No. 1 and the storage battery pack No. 55 are respectively connected to two stationary contacts of the two-position selection switch a, and the tail of the storage battery pack a and the tail of the storage battery pack B, that is, the negative electrodes of the storage battery pack No. 54 and the storage battery pack No. 108. When the movable contacts of the two-position selection switch A and the two-position selection switch B are respectively positioned at the static contact gear connected to the No. 1 storage battery and the No. 54 storage battery, the storage battery pack A is connected to a load 5; when the movable contacts of the two-position selector switch a and the two-position selector switch B are located at the stationary contact positions connected to the No. 55 battery and the No. 108 battery, respectively, the battery pack B is connected to the load 5. Correspondingly, in the present embodiment, a relay 22 is respectively disposed between two stationary contacts of the two-position selector switch a and the two-position selector switch B, and the relay 22 is a relay 22 that is present or absent, and starts to operate when no current passes through the relay 22, and controls the moving contact to move toward the other stationary contact.
In this embodiment, the dc voltage stabilizing unit 3 is serially connected between the multi-position selection switch 21 and the power transmission line, wherein the dc voltage stabilizing unit 3 is a dc voltage stabilizer, and an input end of the dc voltage stabilizing unit 3 is connected to the multi-position selection switch 21, that is, a 110V current supplied from the battery pack is input, and a stable 220V current is output after voltage stabilizing conversion, so as to ensure normal operation of the load 5.
In the preferred scheme of this embodiment, the positive line in the power transmission line includes a closing bus and a control bus, wherein one end of a moving contact of a two-position selector switch a is connected to the control bus, one end of a moving contact of a two-position selector switch B is connected to the negative line, and simultaneously, the positive pole of a dc charging unit 4 is connected to the closing bus and the control bus, and the negative pole is connected to the negative line, the positive pole of No. 1 battery in the battery unit 1 is connected to the closing bus through an individual wire, the negative pole of No. 108 battery is connected to the negative line through an individual wire, and a load 5 is connected between the control bus, the closing bus and the negative line. Therefore, the direct current charging unit 4, namely the direct current charging screen, can directly supply 220V direct current to the load 5 through the closing bus and the control bus, and can also charge the storage battery unit 1 through the closing bus, and the storage battery unit 1 supplies power to the load 5 through the control bus.
In a preferred embodiment of the present invention, the dc charging unit 4 further includes a high-frequency switching power supply 41, and an output terminal of the high-frequency switching power supply 41 is connected to the wires between the dc multi-circuit switching units 2 and between the dc voltage stabilizing units 3. The output voltage of the high-frequency switching power supply 41 is 110V, which is the same as the 110V regulated current voltage output by the storage battery unit 1, so as to provide a stable working power supply for the dc voltage regulation unit 3, and finally, a 220V dc power supply is output through the dc voltage regulator.
In a preferred embodiment of the present invention, normally closed switches 7 are disposed between the storage battery unit 1 and the dc multi-circuit switching unit 2, between the dc voltage stabilizing unit 3 and the power transmission line, and at the output terminal of the high-frequency switching power supply 41. The normally closed switch 7 is closed most of the time, is used as a wire, and is disconnected only in the processes of installation, disassembly, maintenance and overhaul to ensure safety.
In a further preferred embodiment of the present invention, a diode 6 is disposed on a conducting wire between the dc voltage stabilizing unit 3 and the multi-bit selection switch 21, and a path direction of the diode 6 faces the dc voltage stabilizing unit 3. By using the unidirectional conductivity of the diode 6, the high-voltage and high-frequency switching power supply 41 of the power receiving end, namely the control bus, can be prevented from being fed back to the power supply end, namely the storage battery unit 1, so that reverse charging can be prevented, and the normal power supply of the storage battery unit 1 can be ensured.
The utility model discloses at the during operation, storage battery A at first switches on, at first transmits electricity through storage battery A when the station loses electricity with the interchange or the 4 trouble of direct current charging unit need be exported by storage battery, when storage battery A appears opening a way the trouble, two-position selector switch A's stationary contact one end outage switches to next gear through relay 22, switches on storage battery B promptly, then through storage battery B to the continuous power supply of load 5, vice versa. Therefore, important power supplies such as direct current power supplies, communication power supplies and UPS power supplies of transformer substations and power plants can be ensured to supply power continuously and reliably, and relay protection and correct action of automatic devices of the relay protection and the automatic devices of the relay protection under the accident condition are ensured, so that the normal and safe operation of the whole transformer substations is ensured. Meanwhile, the storage battery pack A is used for supplying power at first, and if an open-circuit fault occurs, the storage battery pack A is switched to be connected with the storage battery pack B, so that the storage battery pack A has certain problems of open-circuit fault and the like if the storage battery pack B in a working state is found during maintenance, a fault point can be directly found, and the maintenance and the repair are convenient.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (9)
1. The utility model provides a transformer substation storage battery open circuit protection device, transformer substation storage battery open circuit protection device connect in the power transmission line, still be connected with the load on the power transmission line, wherein the power transmission line includes positive pole line and negative pole line, its characterized in that: the open-circuit protection device for the storage battery pack of the transformer substation comprises a storage battery unit, a direct-current multi-circuit switching unit and a direct-current voltage stabilizing unit, wherein the storage battery unit comprises a plurality of storage battery packs which are mutually connected in series, each storage battery pack comprises a storage battery or is formed by connecting a plurality of storage batteries in series, the direct-current multi-circuit switching unit comprises two multi-position selection switches, the number of selectable gears of the multi-position selection switches is the same as that of the storage battery packs and is respectively and correspondingly connected to the storage battery packs, the direct-current voltage stabilizing unit is arranged between the multi-position selection switches and a power transmission line in series, and the open-circuit protection device further comprises a.
2. The substation storage battery pack open circuit protection device of claim 1, wherein: one ends of moving contacts of the two multi-position selection switches are respectively connected to a positive line and a negative line, one ends of static contacts of the multi-position selection switches connected with the positive line are respectively and correspondingly connected to the negative electrode of each storage battery pack, one ends of the static contacts of the multi-position selection switches connected with the negative line are respectively and correspondingly connected to the positive electrode of each storage battery pack, a relay is further connected in parallel to a circuit at one end of the static contacts of each storage battery pack, and the relay controls the contacts to move towards the next static contact when acting.
3. The substation storage battery pack open circuit protection device of claim 2, wherein: the positive pole line in the power transmission line comprises a closing bus and a control bus, one end of a movable contact of one multi-position selection switch is connected to the control bus, one end of a movable contact of the other multi-position selection switch is connected to the negative pole line, the positive pole of the direct current charging unit is connected with the closing bus and the control bus, the negative pole of the direct current charging unit is connected with the negative pole line, and the positive pole of the storage battery unit is connected with the closing bus and the negative pole of the storage battery unit is connected with the negative pole line.
4. The substation storage battery pack open circuit protection device of claim 3, wherein: the load is connected between the control bus and the negative line.
5. The substation battery pack open circuit protection device according to any one of claims 1-4, characterized in that: the direct current charging unit further comprises a high-frequency switching power supply, and the output end of the high-frequency switching power supply is connected to a wire between the direct current multi-circuit switching unit and the direct current voltage stabilizing unit.
6. The substation storage battery pack open circuit protection device of claim 5, wherein: and normally closed switches are arranged between the storage battery unit and the direct current multi-circuit switching unit, between the direct current voltage stabilizing unit and the power transmission line and at the output end of the high-frequency switching power supply.
7. The substation storage battery pack open circuit protection device of claim 6, wherein: the output voltage of the storage battery and the output voltage of the high-frequency switching power supply are both 110V, and the output voltages of the direct-current charging unit and the direct-current voltage stabilizing unit are 220V.
8. The substation storage battery pack open circuit protection device of claim 7, wherein: and a diode is arranged on a lead between the direct current voltage stabilizing unit and the multi-position selection switch, and the path direction of the diode faces the direct current voltage stabilizing unit.
9. The substation storage battery pack open circuit protection device of claim 2, wherein: the relay is a relay with or without, and the relay acts when no current passes through the relay.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921629152.2U CN210693533U (en) | 2019-09-27 | 2019-09-27 | Open-circuit protection device for storage battery pack of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921629152.2U CN210693533U (en) | 2019-09-27 | 2019-09-27 | Open-circuit protection device for storage battery pack of transformer substation |
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| CN210693533U true CN210693533U (en) | 2020-06-05 |
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| CN201921629152.2U Active CN210693533U (en) | 2019-09-27 | 2019-09-27 | Open-circuit protection device for storage battery pack of transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571909A (en) * | 2019-09-27 | 2019-12-13 | 国网重庆市电力公司璧山供电分公司 | open circuit protection mechanism for storage battery |
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2019
- 2019-09-27 CN CN201921629152.2U patent/CN210693533U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571909A (en) * | 2019-09-27 | 2019-12-13 | 国网重庆市电力公司璧山供电分公司 | open circuit protection mechanism for storage battery |
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