CN216721006U - Automatic input device for open circuit protection of storage battery pack of transformer substation - Google Patents
Automatic input device for open circuit protection of storage battery pack of transformer substation Download PDFInfo
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- CN216721006U CN216721006U CN202123137355.XU CN202123137355U CN216721006U CN 216721006 U CN216721006 U CN 216721006U CN 202123137355 U CN202123137355 U CN 202123137355U CN 216721006 U CN216721006 U CN 216721006U
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- battery pack
- alarm
- voltage monitoring
- monitoring relay
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Abstract
The utility model provides an automatic input device for open-circuit protection of a storage battery pack of a transformer substation, which mainly comprises a storage battery module, an open-circuit alarm module, a storage battery pack switching module and a storage battery pack boosting module, wherein the storage battery module comprises a plurality of storage battery packs which are mutually connected in series, each storage battery pack comprises one storage battery or is formed by connecting a plurality of storage batteries in series, the open-circuit alarm module is connected with each storage battery pack, the storage battery pack switching module is connected with each storage battery pack and the open-circuit alarm module, and the storage battery pack boosting module is connected between each storage battery pack and a load circuit. The utility model comprises a plurality of groups of storage battery packs, wherein the storage battery packs are connected to a power transmission line through storage battery switching modules, and when one group of storage batteries has an open-circuit fault, the storage battery switching modules immediately switch on the other storage battery packs, so that the continuous power supply to a load can be ensured.
Description
Technical Field
The utility model relates to the technical field of electrical equipment maintenance, in particular to an automatic switching device for open-circuit protection of a storage battery pack of a transformer substation.
Background
The heart of the secondary system of the substation is a direct current system which 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, and a storage battery pack is an important component of the system as shown in FIG. 1. Since the storage battery is popularized and used in a transformer substation, the direct current non-output fault cases of the storage battery pack occur frequently, once a fault occurs, a direct current power supply system of a total station faces a power loss crisis, and the safe and stable operation of a power grid is seriously threatened;
in the inspection and maintenance of the storage battery pack at present, once the storage battery pack of the transformer substation fails, the standby storage battery pack needs to be manually input for fault isolation, as shown in fig. 2, the standby storage battery pack normally operates after isolation, and the fault storage battery pack breaks away for maintenance.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the embodiment of the utility model provides an automatic switching device for open-circuit protection of a storage battery pack of a transformer substation, which solves the problems of long maintenance time, large maintenance workload and the like of the storage battery pack in the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
in one embodiment, the automatic switching device for the open-circuit protection of the storage battery pack of the transformer substation comprises a storage battery module and a storage battery pack switching module, wherein the storage battery pack is connected to a power transmission line, the storage battery pack comprises a plurality of storage battery packs connected in series, the storage battery pack consists of one storage battery or is formed by connecting a plurality of storage batteries in series, the storage battery pack switching module comprises a voltage monitoring relay and a switching loop, the switching loop comprises an auxiliary contact of the voltage monitoring relay, the voltage monitoring relay is connected with at least one storage battery pack in parallel, and each storage battery pack is connected with the power transmission line through the switching loop.
In one embodiment, the battery module includes two battery packs.
In one embodiment, the voltage monitoring relay is provided with two sets and each set includes a first under-voltage monitoring relay and a first over-voltage monitoring relay, the two sets of voltage monitoring relays correspond to the two storage battery packs respectively, the switching loop is provided with two sets and corresponds to the two storage battery packs respectively, each set of switching loop includes a first normally-open auxiliary contact of the first over-voltage monitoring relay connected in parallel with the corresponding storage battery pack and a second normally-open auxiliary contact of the first under-voltage monitoring relay connected in parallel with the other storage battery pack, and the first normally-open auxiliary contact and the second normally-open auxiliary contact are connected in series.
In one embodiment, the system further comprises two groups of open-circuit alarm modules respectively corresponding to the two storage battery packs, wherein each group of open-circuit alarm modules comprises a second under-voltage monitoring relay and an alarm unit, and the second under-voltage monitoring relay is connected with the corresponding storage battery pack in parallel; the alarm unit comprises a third auxiliary contact of the second under-voltage monitoring relay, remote signaling terminals connected to two ends of the third auxiliary contact, a remote signaling power supply and an alarm device which are respectively connected with the remote signaling terminals;
and the remote signaling terminal is used for converting the state of the third auxiliary contact into a level signal and sending the level signal to the alarm device, and the alarm device is used for giving an alarm.
In one embodiment, the third auxiliary contact is a normally open auxiliary contact.
In one embodiment, the system further comprises two groups of open-circuit alarm modules respectively corresponding to the two storage battery packs, wherein each group of open-circuit alarm modules comprises a second under-voltage monitoring relay and an alarm unit, and the second under-voltage monitoring relay is connected with the corresponding storage battery pack in parallel; the alarm unit comprises a third normally-open auxiliary contact of a second under-voltage monitoring relay, an alarm power supply and an alarm device which are connected in series.
In one embodiment, the first undervoltage-monitoring relay and the second undervoltage-monitoring relay are the same undervoltage-monitoring relay.
In one embodiment, the alarm device comprises an acoustic alarm and/or an optical alarm.
In one embodiment, the system further comprises two groups of storage battery pack boosting modules, and each group of storage battery pack boosting modules is connected between the switching loop of the corresponding storage battery pack and the power transmission line.
In one embodiment, the high-frequency switch power supply device is further included, and output ends of the high-frequency switch power supply device are respectively connected to the two groups of storage battery packs and used for respectively charging the two groups of storage battery packs.
Compared with the prior art, the utility model has the following beneficial effects:
1. in the utility model, the storage battery pack switching module can switch the storage battery packs in time, the voltage monitoring relay monitors the voltage of at least one storage battery pack, the storage battery pack automatically breaks away from the failed storage battery pack when the storage battery pack fails, and the rest storage battery packs which normally work supply power to the load, thereby ensuring the continuous power supply of the load and ensuring the normal operation of the whole transformer substation.
Drawings
FIG. 1 is a diagram of a substation DC system architecture;
FIG. 2 is the operation flow of the original battery pack;
FIG. 3 is a structural diagram of an automatic throw-in device for open circuit protection of a storage battery pack;
FIG. 4 is a flowchart of the operation of the automatic switching device for the open circuit protection of the battery pack;
fig. 5 is a structural view of a battery module;
FIG. 6 is a schematic diagram of an open alarm module;
FIG. 7 is a schematic diagram of a battery pack switching module;
FIG. 8 is a schematic diagram of the battery pack switching module after switching the batteries;
FIG. 9 is a schematic diagram of the 110V high-frequency switching power supply device after being connected;
fig. 10 is an overall schematic diagram of the automatic throw-in device for open-circuit protection of the battery pack.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
In a first aspect, as shown in fig. 3-10, in one embodiment, the present invention discloses an automatic transformer substation storage battery pack open circuit protection switching device, as shown in fig. 3, comprising a storage battery module connected to a power line, and a storage battery pack switching module, wherein the storage battery module comprises a plurality of storage battery packs connected in series, each storage battery pack consists of a storage battery or consists of a plurality of storage batteries connected in series, the storage battery pack switching module comprises a voltage monitoring relay and a switching loop, the switching loop comprises an auxiliary contact of the voltage monitoring relay, the voltage monitoring relay is connected in parallel with at least one storage battery pack, and each storage battery pack is connected with the power line through the switching loop.
In the embodiment, the voltage at two ends of the storage battery pack is monitored by the voltage monitoring relay, when the storage battery pack is in an open circuit, the storage battery pack switching module cuts off a failed storage battery pack, and an adjacent storage battery pack which is not failed supplies power to the power transmission line through a switching loop in the storage battery pack switching module, so that the direct-current non-output failure of the storage battery pack of the transformer substation is prevented, and the safety and stability of the operation of a power grid are improved.
In a preferred embodiment, as shown in fig. 5, the battery module comprises 108 batteries in total, and is divided into A, B groups, each group is formed by connecting 54 batteries in series, wherein the group A comprises batteries with numbers 1-54, the group B comprises batteries with numbers 55-108, and the voltages of the two groups are both 110V.
In one embodiment, as shown in fig. 7, voltage monitoring relays are connected in parallel to both ends of the battery packs a and B, and the voltage monitoring relays are divided into undervoltage monitoring relays that control the normally open auxiliary contacts in the switching circuit to operate when the battery packs are open, and overvoltage monitoring relays that control the normally open auxiliary contacts in the switching circuit to operate at an operating voltage of 107V when the battery packs are normally operating;
a normally open auxiliary contact 1JDV2 of the overvoltage monitoring relay 1JDV and a normally open auxiliary contact 4JDV2 of the undervoltage monitoring relay 4JDV are connected in series and are connected between the cathode of the whole storage battery pack A and a power transmission line to form a switching loop 1;
a normally open auxiliary contact 2JDV2 of the overvoltage monitoring relay 2JDV and a normally open auxiliary contact 3JDV2 of the undervoltage monitoring relay 3JDV are connected in series and are connected between the cathode of the whole storage battery pack B and the power transmission line to form a switching loop 2;
specifically, the method comprises the following steps: when the storage battery pack A, B normally works, the overvoltage monitoring relays 1JDV and 2JDV work, the undervoltage monitoring relays 3JDV and 4JDV do not work, the normally-open auxiliary contact 1JDV2 is closed, the 4JDV2 is opened, the 2JDV2 is closed, the 3JDV2 is opened, the switching loop 1 and the switching loop 2 are both opened, and the storage battery pack A and the storage battery pack B integrally supply power to a load;
when the storage battery pack A works normally and the storage battery pack B is in an open circuit, the overvoltage monitoring relay 1JDV works, the overvoltage monitoring relay 2JDV does not work, the undervoltage monitoring relay 3JDV does not work, the normally-open auxiliary contact 1JDV2 is closed, the normally-open auxiliary contact 4JDV2 is closed, the normally-open auxiliary contact 2JDV2 is opened, the normally-open auxiliary contact 3JDV2 is opened, the loop 1 is switched, the loop 2 is switched to be opened, and the storage battery pack A supplies power to a load through the storage battery pack boosting module;
when storage battery B normally works, when storage battery A opens, overvoltage monitoring relay 1JDV does not work, 2JDV works, undervoltage monitoring relay 3JDV works, 4JDV does not work, normally-open auxiliary contact 1JDV2 opens, 4JDV2 opens, 2JDV2 closes, 3JDV2 closes, switching loop 1 opens, switching loop 2 passes, and storage battery B supplies power to the load through the storage battery boosting module.
In the above embodiment, the voltage monitoring relay and the normally open auxiliary contact controlled by the voltage monitoring relay jointly form a storage battery pack switching module, so that the voltage monitoring of the storage battery pack and the fault occurrence of the storage battery pack can be realized, half of the faulty storage battery pack can be cut off in time, and the other half of the normal storage battery pack can be put into use.
In a preferred embodiment, as shown in fig. 6 and 7, the battery pack switching system further includes two sets of open-circuit alarm modules corresponding to the two battery packs, respectively, each set of open-circuit alarm module includes an undervoltage monitor relay (3JDV or 4JDV) and an alarm unit in the battery pack switching module, and the undervoltage monitor relays 3JDV and 4JDV are connected in parallel with the corresponding battery packs, respectively; the alarm unit comprises a normally open auxiliary contact (3JDV1 or 4JDV1) of the undervoltage monitoring relay, remote signaling terminals connected to two ends of the normally open auxiliary contact (3JDV1 or 4JDV1), a remote signaling power supply and an alarm device, wherein the remote signaling power supply and the alarm device are respectively connected with the remote signaling terminals;
the remote signaling terminal is used for converting the state of the normally-open auxiliary contact into a level signal and sending the level signal to the alarm device, the output voltage of the remote signaling power supply is 220V, and the alarm device comprises an acoustic alarm and an optical alarm and can give out acoustic and optical alarms;
specifically, the method comprises the following steps: when the storage battery pack A works normally, the normally-open auxiliary contact 3JDV1 is disconnected, the remote signaling terminal outputs low level, and the alarm device does not give an alarm; when the storage battery pack A is opened, the normally-open auxiliary contact 3JDV1 is closed and opened, the remote signaling power supply supplies power to the remote signaling terminal, the remote signaling terminal outputs high level, an alarm signal is sent to the alarm device, and the alarm device gives an alarm;
when the storage battery pack B works normally, the normally-open auxiliary contact 4JDV1 is disconnected, the remote signaling terminal outputs low level, and the alarm device does not give an alarm; when the storage battery pack B is opened, the normally-open auxiliary contact 4JDV1 is closed and opened, the remote signaling power supply supplies power to the remote signaling terminal, the remote signaling terminal outputs high level, an alarm signal is sent to the alarm device, and the alarm device gives an alarm.
In the embodiment, the open circuit alarm module and the storage battery switching module share one under-voltage monitoring relay, so that the resource utilization efficiency is improved, the cost is saved, a remote signaling terminal is introduced into the alarm unit, an independent power supply supplies power to the alarm unit, an alarm signal is sent to the alarm device when the storage battery is open circuit, the remote alarm is realized, and the alarm device adopts an audible and visual alarm mode, so that the situation that a worker neglects alarm information can be prevented.
In one embodiment, the system further comprises two groups of open-circuit alarm modules corresponding to the two storage battery packs respectively, each group of open-circuit alarm modules comprises an undervoltage monitoring relay (3JDV or 4JDV) and an alarm unit in the storage battery pack switching module, and the undervoltage monitoring relays 3JDV and 4JDV are connected with the corresponding storage battery packs respectively in parallel; the alarm unit comprises a normally open auxiliary contact (3JDV1 or 4JDV1), an alarm power supply and an alarm device which are connected in series with the undervoltage monitoring relay; the output voltage of the alarm power supply is 220V, and the alarm device comprises an audible alarm and an optical alarm and can give out audible and optical alarms;
specifically, the method comprises the following steps: when the storage battery pack A works normally, the normally-open auxiliary contact 3JDV1 is disconnected, and the alarm device does not give an alarm; when the storage battery pack A is opened, the normally-open auxiliary contact 3JDV1 is closed, the alarm power supply supplies power to the alarm device, and the alarm device gives an alarm;
when the storage battery pack B works normally, the normally-open auxiliary contact 4JDV1 is disconnected, and the alarm device does not give an alarm; when the storage battery B is in an open circuit, the normally-open auxiliary contact 4JDV1 is closed, the alarm power supply supplies power to the alarm device, and the alarm device gives an alarm.
In the embodiment, the open-circuit alarm module and the storage battery pack switching module share one under-voltage monitoring relay, so that the resource utilization efficiency is improved, the cost is saved, the control circuit and the alarm circuit share one normally-open auxiliary contact, the short-distance alarm is realized, and the position of a failed storage battery pack can be conveniently found out.
In one embodiment, as shown in fig. 7 to 9, the system further includes two groups of storage battery pack voltage boosting modules, each group of storage battery pack voltage boosting modules is connected between the switching loop of the corresponding storage battery pack and the power transmission line, and the direct-current control bus is connected after the direct-current voltage of 110V is boosted to 220V, so as to ensure the output voltage requirement of 220V on the control bus.
In the above embodiment, since the number of the automatically-switched storage battery packs is half of the original number, if the automatically-switched storage battery packs are directly connected to the direct-current control bus, the voltage of the control bus is only 110V, and the requirement of 220V is not met, therefore, a storage battery pack boosting module is added, the storage battery pack boosting module boosts the DC110V direct-current power supply to the DC220V and provides a voltage-stabilizing capacitor for the same, so that the load is ensured not to be powered off, and simultaneously, the load current is not provided under the non-fault state of the control voltage.
In a preferred embodiment, as shown in fig. 9, the dc power supply further includes a high-frequency switching power supply device, the high-frequency switching power supply device is installed on the dc screen, and output terminals of the high-frequency switching power supply device are respectively connected to the two sets of battery packs, wherein an output voltage of the high-frequency switching power supply device is 110V, and fig. 10 is an overall schematic diagram of the device after the high-frequency switching power supply device is connected.
In the above-described embodiment, the high-frequency switching power supply device is used to charge the secondary battery pack a or the secondary battery pack B and prevent the secondary battery pack from being loaded during normal operation in the open circuit protection circuit.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides an automatic device that drops into of transformer substation's storage battery open circuit protection which characterized in that: the storage battery pack switching module comprises a voltage monitoring relay and a switching loop, wherein the switching loop comprises an auxiliary contact of the voltage monitoring relay, the voltage monitoring relay is connected with at least one storage battery pack in parallel, and each storage battery pack is connected with the power transmission line through the switching loop.
2. The substation storage battery pack open circuit protection automatic throw-in device as claimed in claim 1, wherein the battery module comprises two of the storage battery packs.
3. The substation storage battery pack open circuit protection automatic switching device according to claim 2, wherein the voltage monitoring relay is provided with two sets, each set comprises a first under-voltage monitoring relay and a first over-voltage monitoring relay, the two sets of the voltage monitoring relays correspond to two storage battery packs respectively, the switching loop is provided with two sets, each set corresponds to two storage battery packs respectively, each set of the switching loop comprises a first normally-open auxiliary contact of the first under-voltage monitoring relay connected in parallel with the corresponding storage battery pack and a second normally-open auxiliary contact of the first under-voltage monitoring relay connected in parallel with the other storage battery pack, and the first normally-open auxiliary contact and the second normally-open auxiliary contact are connected in series.
4. The substation storage battery pack open circuit protection automatic switching device according to claim 3, further comprising two groups of open circuit alarm modules corresponding to the two storage battery packs respectively, wherein each group of open circuit alarm modules comprises a second under-voltage monitoring relay and an alarm unit, and the second under-voltage monitoring relay is connected in parallel with the corresponding storage battery pack; the alarm unit comprises a third auxiliary contact of the second under-voltage monitoring relay, remote signaling terminals connected to two ends of the third auxiliary contact, a remote signaling power supply and an alarm device, wherein the remote signaling power supply and the alarm device are respectively connected with the remote signaling terminals;
the remote signaling terminal is used for converting the state of the third auxiliary contact into a level signal and sending the level signal to the alarm device, and the alarm device is used for giving an alarm.
5. The substation storage battery pack open-circuit protection automatic switching device according to claim 4, wherein the third auxiliary contact is a normally open auxiliary contact.
6. The substation storage battery pack open circuit protection automatic switching device according to claim 3, further comprising two groups of open circuit alarm modules corresponding to the two storage battery packs respectively, wherein each group of open circuit alarm modules comprises a second under-voltage monitoring relay and an alarm unit, and the second under-voltage monitoring relay is connected in parallel with the corresponding storage battery pack; the alarm unit comprises a third normally-open auxiliary contact of the second under-voltage monitoring relay, an alarm power supply and an alarm device which are connected in series.
7. The substation battery pack open circuit protection automatic switching device according to claim 4, 5 or 6, wherein the first under voltage monitoring relay and the second under voltage monitoring relay are the same under voltage monitoring relay.
8. The substation battery pack open circuit protection automatic switching device according to claim 4, 5 or 6, characterized in that the alarm device comprises an acoustic alarm and/or an optical alarm.
9. The substation storage battery pack open circuit protection automatic switching device according to claim 3, further comprising two sets of storage battery pack voltage boosting modules, wherein each set of storage battery pack voltage boosting module is connected between the switching loop corresponding to the storage battery pack and the power transmission line.
10. The substation storage battery pack open circuit protection automatic switching device according to claim 3, further comprising a high frequency switching power supply device, wherein an output end of the high frequency switching power supply device is connected to the two storage battery packs respectively, and is used for charging the two storage battery packs respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123137355.XU CN216721006U (en) | 2021-12-14 | 2021-12-14 | Automatic input device for open circuit protection of storage battery pack of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123137355.XU CN216721006U (en) | 2021-12-14 | 2021-12-14 | Automatic input device for open circuit protection of storage battery pack of transformer substation |
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| Publication Number | Publication Date |
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| CN216721006U true CN216721006U (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123137355.XU Active CN216721006U (en) | 2021-12-14 | 2021-12-14 | Automatic input device for open circuit protection of storage battery pack of transformer substation |
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| CN (1) | CN216721006U (en) |
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- 2021-12-14 CN CN202123137355.XU patent/CN216721006U/en active Active
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