CN113690979A - Device for replacing single storage battery in direct current system - Google Patents
Device for replacing single storage battery in direct current system Download PDFInfo
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- CN113690979A CN113690979A CN202110969014.4A CN202110969014A CN113690979A CN 113690979 A CN113690979 A CN 113690979A CN 202110969014 A CN202110969014 A CN 202110969014A CN 113690979 A CN113690979 A CN 113690979A
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- Prior art keywords
- storage battery
- battery
- diode
- fuse
- iron clamp
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses device of single battery is changed to direct current system includes: the device comprises a diode, a fuse, a positive terminal, a negative terminal, a first iron clamp and a second iron clamp; the cathode of the diode is connected with the first iron clamp through a cathode binding post, the anode of the diode is connected with the first end of the fuse, and the second end of the fuse is connected with the second iron clamp through an anode binding post; when the anode of the fault storage battery is connected with the cathode of the first storage battery, the first iron clamp is connected with the cathode of the first storage battery; the second iron clamp is connected to the positive pole of the second battery when the negative pole of the failed battery is connected to the positive pole of the second battery. The applicant finds that the voltage change between the first storage battery and the second storage battery has directionality before and after the fault storage battery is detached, so that the characteristic of unidirectional conduction of the diodes is utilized to replace a single fault storage battery without the need of withdrawing the whole group of storage batteries from a direct current system, and the technical problems of high operation cost and low working efficiency in the prior art are solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a device for replacing a single storage battery in a direct current system.
Background
In a power plant and a transformer substation, a direct current system provides a reliable direct current power supply for control signals, relay protection, an automatic device, a breaker tripping and closing operation loop and the like, and generally comprises charging equipment, a storage battery pack and a direct current screen insulation monitoring device. Under the influence of materials, structures, operation environments and other factors, the capacity of the storage battery is reduced after the storage battery operates for a period of time, so that the storage battery cannot be recovered or even fails, and the safe and reliable operation of a direct current system and even a transformer substation is seriously threatened. According to the relevant regulations of the national power industry standard, a single battery or the whole battery pack must be replaced under the condition of no power failure.
At present, the method for replacing a single storage battery is as follows: 1) a group of spare storage battery packs is connected into a direct current system; 2) withdrawing the storage battery pack which operates with defects from the direct current system; 3) and replacing the defective battery. 4) And (4) quitting the standby storage battery pack and recovering the original direct current system operation mode. However, this method mainly has several problems; when a single storage battery is replaced, a set of standby storage battery pack is needed, and one set of storage battery is usually 18 storage batteries, so that the cost is high, the working time of carrying, wiring and the like is long, part of storage batteries of a transformer substation are arranged in a protection room with a dense screen cabinet, the placing space of the protection room cannot meet the size of the storage battery pack, and furthermore, when the storage battery pack is connected into a direct-current power supply system in an electrified mode, circulation currents are easily generated between two groups of storage battery packs, and the stability of the power supply system is affected.
Disclosure of Invention
The application aims to provide a device for replacing a single storage battery in a direct current system, which is used for solving the technical problems of high operation cost and low working efficiency in the prior art.
In view of this, the present application provides an apparatus for replacing a single battery in a dc system, comprising: the device comprises a diode, a fuse, a positive terminal, a negative terminal, a first iron clamp and a second iron clamp;
the cathode of the diode is connected with the first iron clamp through the cathode binding post, the anode of the diode is connected with the first end of the fuse, and the second end of the fuse is connected with the second iron clamp through the anode binding post;
when the positive electrode of the fault storage battery is connected with the negative electrode of the first storage battery, the first iron clamp is connected with the negative electrode of the first storage battery;
when the negative pole of the failed battery is connected to the positive pole of a second battery, the second iron clamp is connected to the positive pole of the second battery.
Optionally, the method further comprises: a resistor, a switch, a multimeter;
the first end of the resistor is connected to the positive electrode of the first storage battery, and the second end of the resistor is connected to the first end of the switch; the second end of the switch is connected to the negative electrode of the second storage battery; the multimeter is connected in parallel with the positive electrode of the first storage battery and the negative electrode of the second storage battery.
Optionally, the method further comprises: the first safety seat and the second safety seat;
the negative pole of diode pass through first insurance seat with the first end of fuse links to each other, positive terminal passes through the second insurance seat with the second end of fuse links to each other.
Optionally, the method further comprises: a first wiring connecting sheet and a second wiring connecting sheet;
the positive pole of the diode is connected with the positive terminal through the first wiring connecting sheet, and the negative terminal is connected with the second safety seat through the second wiring connecting sheet.
Optionally, the operating voltage of the fuse is not less than 217.9V.
Optionally, the fuse has a blowing current of 45A.
Optionally, the diode operating current is 67.5A.
Optionally, the reverse breakdown voltage of the diode is not less than 2.1V.
Compared with the prior art, the embodiment of the application has the advantages that:
the utility model provides a device of single battery is changed to direct current system, applicant's discovery is around the trouble battery demolishs, and the voltage change between first battery and second battery has the directionality: before dismantling, the potential of the cathode of the first storage battery is higher than the potential of the anode of the second storage battery, and the potential of the anode of the second storage battery is higher than the potential of the cathode of the first storage battery at the moment of dismantling, so that by utilizing the characteristic of a circuit, a diode is connected in parallel between the first storage battery and the second storage battery, and the incorporation of the diode does not influence a storage battery loop before dismantling a failed storage battery; at the moment of removing the fault storage battery, the storage battery pack keeps a conduction state by virtue of the diode, and at the moment of connecting a new storage battery, the diode exits without influencing a loop, so that the characteristic of unidirectional conduction of the diode is utilized to replace a single fault storage battery without the need of exiting the whole group of storage batteries from a direct-current system. In order to avoid the short-circuit accident of the storage battery caused by the wrong polarity when the diodes are connected in parallel, a fuse is added in the loop: when the loop is reversely connected to generate a large current, the fuse is quickly fused to ensure that the storage battery is not damaged.
The device is simple in access operation, is not influenced by the running condition of the transformer substation, effectively improves the working efficiency of replacing the fault battery in the direct current system, reduces the labor intensity of workers, shortens the fault recovery time of the direct current power supply system, and improves the reliability of the direct current system; thereby the technical problem that the prior art is high in operation cost and low in working efficiency is solved.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a first schematic wiring diagram of an apparatus for replacing a single storage battery in a dc system according to an embodiment of the present disclosure;
fig. 2 is a second wiring diagram of a device for replacing a single storage battery in a dc system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an apparatus for replacing a single storage battery in a dc system according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a current-voltage characteristic of a diode according to an embodiment of the present disclosure.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1 and fig. 2, an apparatus for replacing a single battery in a dc system according to an embodiment of the present application includes: diode, fuse, anodal terminal, negative terminal, first iron clamp, second iron clamp.
The negative pole of diode passes through the negative terminal and links to each other with first iron clamp, and the anodal first end in the fuse that connects in the fuse, and the second end of fuse passes through the positive terminal and links to each other with the second iron clamp.
When the anode of the fault storage battery is connected with the cathode of the first storage battery, the first iron clamp is connected with the cathode of the first storage battery; the second iron clamp is connected to the positive pole of the second battery when the negative pole of the failed battery is connected to the positive pole of the second battery.
It can be understood that, the connection relationship between the first storage battery, the second storage battery and the failed storage battery is as shown in fig. 1, and by connecting a device for replacing a single storage battery in parallel between the first storage battery and the second storage battery, the negative electrode is connected to the point a, and the positive electrode is connected to the point B, and considering that a short-circuit accident of the storage battery can be caused if the polarity is wrong when a diode loop is connected in parallel, a fuse is connected in series in the loop for this purpose: when the loop is reversely connected to generate a large current, the fuse is quickly fused to ensure that the storage battery is not damaged.
It should be noted that the operation process of the diode loop is as follows:
before dismantling the faulty battery, UAB>0, the diode D is subjected to a reverse bias voltage across it, which turns off (does not conduct). The incorporation of the diode does not affect the battery circuit.
At the moment of dismantling a faulty battery, UAB<0, the diode D is forward biased across it, and is conducting. The battery pack is kept in a conductive state by means of a diode.
Instant of new battery access, UAB>And 0, the two ends of the diode D are cut off (not conducted) by reverse bias voltage again, and the storage battery pack is kept to be conducted through a new battery holding loop. The diode exits without affecting the loop.
As shown in fig. 4, the diode has a voltage drop of about 0.7V when it is turned on, and the voltage drop is constant, and is not affected by the magnitude of the loop current and voltage, and its resistance can be ignored. Therefore, after the faulty battery is removed, the output voltage drop of the battery pack is also a constant value, which is given by the following values, for example, when the spare battery pack is replaced:
voltage of fault battery + voltage drop of diode 12V + 0.7V-12.7V
The output voltage reduction value/nominal voltage is 12.7/220 is 5.8%
Therefore, in the replacement process, one storage battery is removed, the output voltage and the capacity of the storage battery pack are both reduced for a short time in the replacement process, the reduction amount of the output voltage of the storage battery pack meets the requirement of the regulation (national industry standard DL/T724-2000), and the system is not influenced.
The utility model provides a device of single battery is changed to direct current system, applicant's discovery is around the trouble battery demolishs, and the voltage change between first battery and second battery has the directionality: before dismantling, the potential of the cathode of the first storage battery is higher than the potential of the anode of the second storage battery, and the potential of the anode of the second storage battery is higher than the potential of the cathode of the first storage battery at the moment of dismantling, so that by utilizing the characteristic of a circuit, a diode is connected in parallel between the first storage battery and the second storage battery, and the incorporation of the diode does not influence a storage battery loop before dismantling a failed storage battery; at the moment of removing the fault storage battery, the storage battery pack keeps a conduction state by virtue of the diode, and at the moment of connecting a new storage battery, the diode exits without influencing a loop, so that the characteristic of unidirectional conduction of the diode is utilized to replace a single fault storage battery without the need of exiting the whole group of storage batteries from a direct-current system. In order to avoid the short-circuit accident of the storage battery caused by the wrong polarity when the diodes are connected in parallel, a fuse is added in the loop: when the loop is reversely connected to generate a large current, the fuse is quickly fused to ensure that the storage battery is not damaged. Thereby the technical problem that the prior art is high in operation cost and low in working efficiency is solved.
Referring to fig. 1, in a further specific embodiment, the apparatus for replacing a single battery in a dc system of the present application further includes: a resistor, a switch, a multimeter;
the first end of the resistor is connected to the anode of the first storage battery, and the second end of the resistor is connected to the first end of the switch; the second end of the switch is connected with the negative electrode of the second storage battery; the universal meter is connected in parallel with the positive pole of the first storage battery and the negative pole of the second storage battery.
Referring to fig. 3, in a specific embodiment, the apparatus for replacing a single battery in a dc system of the present application further includes: the first safety seat and the second safety seat; the negative pole of diode links to each other through the first end of first insurance seat with the fuse, and the anodal terminal passes through the second insurance seat and links to each other with the second end of fuse.
Further, in a specific embodiment, the apparatus for replacing a single battery in a dc system of the present application further includes: a first wiring connecting sheet and a second wiring connecting sheet; the positive pole of the diode is connected with the positive terminal through the first wiring connecting piece, and the negative terminal is connected with the second safety seat through the second wiring connecting piece.
It should be noted that, in the practical application process, the diode, the fuse and the binding post are connected through the safety seat and the wiring connecting piece, so that the operation is convenient, and the construction safety is improved. The device of the present application is designed with the size shown in fig. 3, the size shown in fig. 3 is only an example of the present application, and those skilled in the art can design the device according to actual needs without limitation.
In one specific embodiment, the operating voltage of the fuse is not less than 217.9V.
In one specific embodiment, the fuse has a blowing current of 45A.
It should be noted that, the calculation method of the fuse operating voltage and the fusing current is as follows:
a) working voltage is set as storage battery voltage-single storage battery voltage is set as 220-2.1 as 217.9V
To ensure reliable cutoff of the fuse: the selected working voltage is more than or equal to 217.9V
b) Fusing current is maximum impact current + margin current
According to investigation and statistics, the maximum impact current value of the direct current system is 20-30A, and 30A of the maximum value is taken; the current margin is 15A, which is the maximum impact current value of 0.5 times the empirical value. Therefore, the method comprises the following steps: the fuse blowing current is 30+15 to 45A.
In one specific embodiment, the diode operating current is 67.5A.
In a specific embodiment, the reverse breakdown voltage of the diode is not less than 2.1V.
It should be noted that the calculation method of the diode operating current and the reverse breakdown voltage is as follows:
a) to prevent the diode from being damaged when the loop is short-circuited, the working current of the diode should be:
working current ═ fuse fusing current +0.5 × fuse fusing current
67.5A (note: 0.5 is the margin empirical factor)
b) The reverse breakdown voltage is larger than or equal to the voltage of a single storage battery and is 2.1V
The device for replacing the single storage battery of the direct current system utilizes the characteristic of one-way conduction of the diode to replace the single defective storage battery without the whole battery rental to withdraw from the direct current system, can be applied to short-time replacement of single or multiple storage batteries in the storage battery pack, is simple to access and free from the influence of the running condition of a transformer substation, effectively improves the working efficiency of replacing the fault battery in the direct current system, reduces the labor intensity of workers, shortens the fault recovery time of the direct current power supply system, and improves the reliability of the direct current system. Thereby the technical problem that the prior art is high in operation cost and low in working efficiency is solved.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A device for replacing a single storage battery in a direct current system is characterized by comprising: the device comprises a diode, a fuse, a positive terminal, a negative terminal, a first iron clamp and a second iron clamp;
the cathode of the diode is connected with the first iron clamp through the cathode binding post, the anode of the diode is connected with the first end of the fuse, and the second end of the fuse is connected with the second iron clamp through the anode binding post;
when the positive electrode of the fault storage battery is connected with the negative electrode of the first storage battery, the first iron clamp is connected with the negative electrode of the first storage battery;
when the negative pole of the failed battery is connected to the positive pole of a second battery, the second iron clamp is connected to the positive pole of the second battery.
2. The apparatus for replacing a single battery in a dc system according to claim 1, further comprising: a resistor, a switch, a multimeter;
the first end of the resistor is connected to the positive electrode of the first storage battery, and the second end of the resistor is connected to the first end of the switch; the second end of the switch is connected to the negative electrode of the second storage battery; the multimeter is connected in parallel with the positive electrode of the first storage battery and the negative electrode of the second storage battery.
3. The apparatus for replacing a single battery in a dc system according to claim 1, further comprising: the first safety seat and the second safety seat;
the negative pole of diode pass through first insurance seat with the first end of fuse links to each other, positive terminal passes through the second insurance seat with the second end of fuse links to each other.
4. The apparatus for replacing a single battery in a dc system according to claim 3, further comprising: a first wiring connecting sheet and a second wiring connecting sheet;
the positive pole of the diode is connected with the positive terminal through the first wiring connecting sheet, and the negative terminal is connected with the second safety seat through the second wiring connecting sheet.
5. The apparatus for replacing single battery in DC system according to claim 1, wherein the operating voltage of said fuse is not less than 217.9V.
6. The apparatus for replacing single battery in DC system according to claim 1, wherein the fusing current of said fuse is 45A.
7. The apparatus for replacing single battery in DC system according to claim 1, wherein the operating current of the diode is 67.5A.
8. The apparatus for replacing single battery in DC system according to claim 1, wherein the reverse breakdown voltage of the diode is not less than 2.1V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110969014.4A CN113690979A (en) | 2021-08-23 | 2021-08-23 | Device for replacing single storage battery in direct current system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110969014.4A CN113690979A (en) | 2021-08-23 | 2021-08-23 | Device for replacing single storage battery in direct current system |
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| CN113690979A true CN113690979A (en) | 2021-11-23 |
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| CN202110969014.4A Pending CN113690979A (en) | 2021-08-23 | 2021-08-23 | Device for replacing single storage battery in direct current system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202721241U (en) * | 2012-06-08 | 2013-02-06 | 上海奥鑫能源科技有限公司 | Storage battery isolation protection device |
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| CN105870522A (en) * | 2016-06-08 | 2016-08-17 | 国网辽宁省电力有限公司抚顺供电公司 | Storage battery online replacement device |
| CN207052722U (en) * | 2017-08-14 | 2018-02-27 | 云南电网有限责任公司昭通供电局 | A kind of single-unit deteriorates battery crossover assembly |
| CN207800811U (en) * | 2018-03-08 | 2018-08-31 | 云南电网有限责任公司电力科学研究院 | A kind of crossover assembly for replacing lagging batteries |
| CN108832210A (en) * | 2018-06-28 | 2018-11-16 | 国网福建省电力有限公司龙岩供电公司 | The passive continuous charged renewal device of battery |
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2021
- 2021-08-23 CN CN202110969014.4A patent/CN113690979A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202721241U (en) * | 2012-06-08 | 2013-02-06 | 上海奥鑫能源科技有限公司 | Storage battery isolation protection device |
| CN103138386A (en) * | 2013-03-27 | 2013-06-05 | 国家电网公司 | Storage battery overhauling bypass tool |
| CN205194803U (en) * | 2015-10-30 | 2016-04-27 | 广东电网有限责任公司汕头供电局 | Device is separated to monomer battery |
| CN105870522A (en) * | 2016-06-08 | 2016-08-17 | 国网辽宁省电力有限公司抚顺供电公司 | Storage battery online replacement device |
| CN207052722U (en) * | 2017-08-14 | 2018-02-27 | 云南电网有限责任公司昭通供电局 | A kind of single-unit deteriorates battery crossover assembly |
| CN207800811U (en) * | 2018-03-08 | 2018-08-31 | 云南电网有限责任公司电力科学研究院 | A kind of crossover assembly for replacing lagging batteries |
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