CN105140818A - Rapidly-starting switch cabinet - Google Patents
Rapidly-starting switch cabinet Download PDFInfo
- Publication number
- CN105140818A CN105140818A CN201510621966.1A CN201510621966A CN105140818A CN 105140818 A CN105140818 A CN 105140818A CN 201510621966 A CN201510621966 A CN 201510621966A CN 105140818 A CN105140818 A CN 105140818A
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- Prior art keywords
- signal
- switch cabinet
- flop
- flip
- motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/055—Features relating to the gas
Abstract
The invention discloses a rapidly-starting switch cabinet. The switch cabinet comprises a cabinet body. The cabinet body is connected with a vacuumizing pump and an air charging pump. The cabinet body is provided with a detection hole and is externally connected with a detection protection device via the detection hole. The detection protection device comprises a detection unit and a control unit. The detection unit detects gas concentration in the switch cabinet and outputs sensing signals. The control unit is coupled to the detection unit and controls the work timing sequence of the vacuumizing pump and the air charging pump according the sensing signals. The objective of the invention is to detect air concentration of protection atmosphere in the switch cabinet via the detection protection device and automatically perform vacuumization and nitrogen charging operation in the switch cabinet according to the gas concentration, and automation efficiency of production is increased.
Description
Technical field
The present invention relates to technical field of electric power, particularly a kind of quick start switch cabinet.
Background technology
Indoor alternating current high voltage Cubicle Gas-Insulated Switchgear (hereinafter referred to as " gas-filling cabinet ") is switchgear of new generation, main switch both also can use the vacuum circuit-breaker of spring mechanism with permanent magnetic actuator vacuum circuit breaker, whole cabinet adopts air insulation to combine with sulfur hexafluoride gas compartment, not only compact but also extendible, be applicable to power distribution automation.Gas-filling cabinet has the features such as compact conformation, flexible operation, interlocking be reliable, requires all can provide gratifying technical scheme to various different application scenario (particularly the place of bad environments), different users.The employing of sensing technology and up-to-date protection relay, adds advanced technical performance and the assembling scheme of light and flexible, can meet the different demand of user completely.Gas-filling cabinet is applicable to the small-sized secondary substation of electric power system, switching station, box-type substation, residential quarters, industrial and mining enterprises, megastore, is specially adapted to the occasion that airport, subway, railway etc. are higher to electricity consumption requirement.
Wherein, when protection nitrogen, switch cubicle needs to rely on vacuum pumping pump to vacuumize, and in cabinet, pour nitrogen after having vacuumized, nitrogen gas concn needs by repeatedly observing instrument to determine.This just needs the index relying on operating personnel's moment supervisory instrument.
In larger switch cubicle, it is longer that nitrogen is filled with the required time, and operating personnel limit the labour of operating personnel on the one hand to the supervision of instrument, on the other hand along with dispersion appears in its attentiveness of growth of operating time.
Summary of the invention
The object of the invention is to overcome or slow down the part at least above-mentioned shortcoming, a kind of quick start switch cabinet is provided hereby, comprise cabinet, described cabinet is connected with vacuum pumping pump and inflator pump, it is characterized in that: described cabinet has detect aperture, described cabinet is circumscribed with detection protective device by detect aperture;
Wherein, described detection protective device comprises detecting unit and control unit;
Described detecting unit detects the gas concentration of cabinet inside, and exports transducing signal,
Described control unit couples detecting unit, and controls the work schedule of described vacuum pumping pump and inflator pump according to transducing signal.
Preferably, described control unit comprises
First comparing unit, compares the first reference voltage preset and transducing signal, when the first reference voltage first time was greater than described transducing signal, exports the first pulse signal;
Logical block, couples described first comparing unit, and in response to described first pulse signal, to overturn the control signal that it exports;
Vacuum unit, couples described logical block, and according to the high level state of described control signal, controls the unlatching of described vacuum pumping pump, according to the low level state of described control signal, control the closedown of described vacuum pumping pump;
Inflation unit, couples described logical block, and according to the low level state of described control signal, controls the unlatching of described inflator pump, according to the high level state of described control signal, control the closedown of described inflator pump;
Second comparing unit, compares the second reference voltage preset and transducing signal, when the second reference voltage is less than described transducing signal, controls described inflation unit and closes.
Preferably, described first comparing unit comprises
First comparator, its normal phase input end receives the first reference voltage, and its inverting input receives described transducing signal;
First single-shot trigger circuit, couples the output of described first comparator, in response to the rising edge pulse that described first comparator exports, to export the first pulse signal.
Preferably, described logical block comprises
JK flip-flop, its J leads ends receives the 3rd reference voltage having high level, and its CL leads ends receives described first pulse signal, and its K pin receives power supply signal; Reset circuit, under conventional sense, export the K leads ends of power supply signal to described JK flip-flop of high level, in the reset state, the power supply signal of output low level, to the K leads ends of described JK flip-flop, exports the CL leads ends of the second pulse signal to described JK flip-flop.
Preferably, described reset circuit comprises normally closed button, the normally closed button between described connection power supply and divider resistance;
The K leads ends of described JK flip-flop is coupled between described normally closed button and divider resistance;
Any tie point between described normally closed button and divider resistance is successively by being coupled to the CL leads ends of described JK flip-flop after reverse delayer and the second single-shot trigger circuit.
Preferably, described vacuum unit comprises vacuumizing start circuit and the first motor-drive circuit; Wherein, described vacuumizing start circuit comprises often opens button, the first NMOS tube, the 3rd resistance, and described one end of often opening button connects power supply, and the other end is successively by ground connection after the first NMOS tube and the 3rd resistance, and its grid couples the output of described logical block;
What described first motor-drive circuit comprised the first bidirectional triode thyristor and vacuum pumping pump vacuumizes motor, one end of described first bidirectional triode thyristor connects power supply, the other end is by vacuumizing ground connection after motor, and it controls pole and is coupled between described first NMOS tube and the 3rd resistance.
Preferably, described inflation unit comprises inflation start-up circuit and the second motor-drive circuit; Wherein, described inflation start-up circuit comprises normal first PMOS, the second NMOS tube, the 4th resistance, one end of described first PMOS connects power supply, the other end is successively by ground connection after the second NMOS tube and the 4th resistance, its grid couples the output of described second comparing unit, and the grid of described second NMOS tube couples the output of described logical block;
Described second motor-drive circuit comprises the inflation motor of the second bidirectional triode thyristor and inflator pump, and one end of described second bidirectional triode thyristor connects power supply, and the other end is by ground connection after inflation motor, and it controls pole and is coupled between described first PMOS and the 4th resistance.
Preferably, described second comparing unit comprises,
Second comparator, inverting input receives described transducing signal, and its normal phase input end receives the second default reference voltage, and its output is coupled to the grid of described second NMOS tube.
The present invention is intended to, and by check protection device, detects the gas concentration of cabinet internal protection atmosphere, and carries out vacuumizing and inflated with nitrogen operation according to the control cabinet inside of gas concentration automation, improves production automation efficiency.
Accompanying drawing explanation
Describe these and other aspect of the present invention in further detail now with reference to appended accompanying drawing, it is depicted as currently preferred embodiment of the present invention.Wherein:
Fig. 1 is the front view of quick start switch cabinet embodiment of the present invention;
Fig. 2 is the circuit structure diagram of quick start switch cabinet embodiment of the present invention;
Fig. 3 is nitrogen gas concn variation diagram in quick start switch cabinet embodiment cabinet of the present invention.
Accompanying drawing marks: 1, cabinet; 211, inflator pump; 212, vacuum pumping pump; 3, detect aperture; 4, protective device is detected.
Embodiment
Below in conjunction with accompanying drawing and instantiation, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Referring to figs. 1 through Fig. 3, quick start switch cabinet embodiment of the present invention is described further.
As shown in Figure 1, a kind of quick start switch cabinet, comprises cabinet 1, and cabinet 1 is communicated with vacuum pumping pump 212 by vacuum lead, when cabinet 1 inside vacuumizes by needs, opens vacuum pumping pump 212 and is extracted out by the gas of cabinet 1 inside by vacuum lead;
Moreover, after being vacuumized by vacuum pumping pump 212, be filled with nitrogen by inflator pump 211 pairs of cabinet 1 inside, make the inner nitrogen of cabinet 1 reach prescribed concentration.
The main points of the present embodiment are, cabinet 1 offers detect aperture 3, and the detecting unit detecting protective device 4 detects the temperature of cabinet 1 inside by detect aperture 3, and makes prompting.
As shown in Figure 2, the circuit theory diagrams of detecting unit involved by the present embodiment and control unit.
The nitrogen gas alarm that the present embodiment adopts, common nitrogen gas alarm, after its detection cabinet 1 concentration inside reaches preset concentration, can produce alarm; Meanwhile, it has the output transducing signal of output 5 to 25mA or 1 to 5DC.
The nitrogen gas alarm of the present embodiment exports transducing signal to amplifying unit; Amplifying unit comprises amplifier LM358, resistance R1 and resistance R2;
Wherein, amplifier LM358 normal phase input end receives the transducing signal that nitrogen gas alarm exports, and its output is ground connection after resistance R1 and resistance R2 successively, and its reversed-phase output is connected between resistance R1 and resistance R2,
The transducing signal that nitrogen gas alarm exports can be carried out scale amplifying by such design, and concrete gain amplifier is (R1+R2)/R2.
Can know that amplifying unit exports amplifying signal after transducing signal is carried out scale amplifying by above-mentioned, amplifying signal inputs to the first comparing unit.
First comparing unit comprises the first comparator LM393 and the first single-shot trigger circuit;
The inverting input of the first comparator LM393 is connected to the output of amplifying unit, to receive amplifying signal, its normal phase input end receives the first reference voltage preset, its output exports the first comparison signal to the first single-shot trigger circuit of rising edge pulse according to the comparative result with the first reference voltage
The input of the first single-shot trigger circuit receives by after the first comparison signal, bears the first pulse signal of saltus step clock signal to logic control element according to the first comparison signal;
Logic control element comprises principal and subordinate JR trigger and reset circuit, and the J leads ends of this JR trigger is connected with the 3rd reference voltage, and its CL leads ends connects the output of single-shot trigger circuit, to receive the first single pulse signal,
Reset circuit comprises power supply circuits and delay trigger circuit;
Power supply circuits comprise the 3rd power supply VCC3 connected successively, normally closed button SB2, resistance 5, resistance R6, wherein resistance R6 ground connection;
Reverse delay trigger circuit comprises the reverse delayer and the second single-shot trigger circuit that connect successively;
The K leads ends of above-mentioned JK flip-flop is connected between resistance R5 and resistance R6; The input of reverse delayer is connected between resistance R5 and resistance R6, and the output of the second single-shot trigger circuit exports the CL leads ends of the second pulse signal to JK flip-flop.
According to above-mentioned logic control element, because normally closed button SB2 is closed type contact switch, when normally closed button SB2 does not press, the J pin of JK flip-flop and the equal set of K pin, at high level, can make its Q leads ends overturn and export after now CL pin receives the first pulse signal; When normally closed button SB2 presses, the K pin set low level of JK flip-flop, now because J pin is high level, K pin is low level, then JK flip-flop is in and sets high level state, simultaneously, the input of reverse delayer transfers low level to by high level, then its output transfers low level to by low level, namely be equivalent to create a rising edge signal, second single-shot trigger circuit to the CL leads ends of JK flip-flop, makes the output set high level of JK flip-flop according to the signal pulse signal of generation one clock signal of this rising edge signal, realizes resetting.
The Q leads ends of above-mentioned JK flip-flop outputs control signals to vacuum unit and inflation unit;
Vacuum unit comprises the first power supply VCC1, and the first power supply VCC1 is successively by often opening ground connection after button SB1, the first NMOS tube Q1 and resistance R3; Wherein, the grid of the first NMOS tube Q1 connects the Q leads ends of JK flip-flop;
Preferably, the present embodiment also includes the first motor-drive circuit, and the first motor-drive circuit comprises the second power supply VCC2, wherein, and ground connection after the second power supply VCC2 connects the first bidirectional triode thyristor LQ1 successively and vacuumizes motor M 1; Wherein, the control pole of bidirectional triode thyristor M1 is connected to the source electrode of the first NMOS tube Q1.
The object of such design is, when the Q leads ends of JK flip-flop exports high level, first NMOS tube Q1 is in conducting state, now when press as start button often open button SB1, the magnitude of voltage of the control pole of the first bidirectional triode thyristor LQ1 is the voltage drop of resistance R3, therefore, the first bidirectional triode thyristor LQ1 conducting, vacuumizes motor M 1 and works.
It is worth mentioning that, the Main Function of the bidirectional triode thyristor in the present embodiment controls large voltage by small voltage, ensures that vacuumizing motor can work under rated voltage.
The inflation unit of the present embodiment comprises the second NMOS tube Q2 be connected with the first power supply VCC1, and the second NMOS tube Q2 pipe connects ground connection after the first PMOS Q3, resistance R4 more successively; And the grid of the first PMOS Q3 is connected to the Q leads ends of JK flip-flop, the grid of the second NMOS tube Q3 receives inflation stop signal.
Preferably, the present embodiment also includes the second motor-drive circuit, and the second motor-drive circuit comprises the second bidirectional triode thyristor LQ2 be connected with the second power supply VCC2, and the second bidirectional triode thyristor LQ2 connects the rear ground connection of inflation motor M 2; Wherein, the control pole of the second bidirectional triode thyristor LQ2 is connected to the source electrode of the second NMOS tube.
The object of above-mentioned design is, when the Q pin of JK flip-flop exports high level, vacuumizes motor M 1 and works; When the Q pin output low level of JK flip-flop, if the second NMOS tube Q2 is in conducting state, then inflates motor M 2 and work.
During according to the above-mentioned Q pin output low level when JK flip-flop, the conducting state of the second NMOS tube Q2 directly controls the operating state of inflating motor M 2, therefore by the inflation stop signal of control inputs to the second NMOS tube Q2 grid, the job control inflating motor M 2 can namely be realized.
Particularly, the present embodiment includes the second comparing unit, in this second comparing unit, the inverting input of the second comparator LM393 is connected to the output of amplifying unit, its positive output end is connected with the second reference voltage V ref2, and its output exports the grid of inflation stop signal to aforesaid second NMOS tube Q2.
By above-mentioned after inflation motor M 2 works certain hour, nitrogen gas concn reaches requirement, and now the inflation stop signal of output low level makes inflation motor M 2 quit work; Particularly, nitrogen gas concn is not when reaching requirement, the magnitude of voltage of amplifying signal is less than the second reference voltage V ref2, now the output of the second comparator LM393 exports high level, after the magnitude of voltage of amplifying signal is greater than the second reference voltage V ref2, the output output low level of the second comparator LM393.
Above-mentioned is particular circuit configurations and its major function of each formant of the present embodiment;
As shown in Figure 3, the workflow of the above-mentioned physical circuit to the present embodiment is made explanations:
Cabinet 1 inside has naturally been filled with air, and the mass fraction of nitrogen about 70% in atmosphere, therefore cabinet 1 inside has certain natural nitrogen gas concn; After evacuation, cabinet 1 inside will inevitably reduce the nitrogen gas concn of its inside greatly, is referred to as vacuum nitrogen concentration herein; Vacuumizing end, and after being filled with enough nitrogen, the nitrogen gas concn of its inside must reach maximum, is referred to as saturated nitrogen gas concn herein.
The present embodiment, when starting, is pressed and is often opened button SB1 as what open button, and make often to open button SB1 and be in closure state; Now, what the Q leads ends of the JK flip-flop preset exported is high level, then the first bidirectional triode thyristor LQ1 is in conducting state, then vacuumize motor M 1 and work, and vacuumizes cabinet 1 inside; In vacuum, the nitrogen gas concn of cabinet 1 inside reduces, and by natural nitrogen gas concn near vacuum nitrogen concentration, in the process, the transducing signal that nitrogen gas alarm exports reduces gradually; Namely first reference voltage V ref1 is the voltage signal values of corresponding vacuum nitrogen concentration, after the nitrogen gas concn of cabinet 1 inside is reduced to vacuum nitrogen concentration, first comparator LM393 exports and transfers high level to by low level, can also equivalence be a rising edge pulse signal; The input of single-shot trigger circuit, after receiving this rising edge pulse signal, exports the CL leads ends of a pulse signal to JK flip-flop; Because the J leads ends set of JK flip-flop has the 3rd reference voltage V ref3, namely high level is in all the time, its K pin due to normally closed button SB2 be closure state be also in high level, then JK flip-flop is in rollover states, and its Q leads ends turn to low level by high level; Because the Q leads ends of JK flip-flop turn to low level by high level, the first NMOS tube Q1 transfers not on-state to, vacuumizes motor M 1 and quits work; Because the Q leads ends of JK flip-flop turn to low level by high level, the first PMOS Q3 transfers conducting state to; Due to the voltage signal values corresponding to saturated nitrogen gas concn that the second reference voltage V ref2 presets, then the output of the second comparator LM393 do not reach capacity in cabinet 1 inside nitrogen gas concn time, all the time export high level, then the second NMOS tube is in conducting state all the time;
According to above-mentioned, inflation motor M 2 enters operating state after the Q leads ends upset of JK flip-flop, is filled with nitrogen to cabinet 1 inside; After the nitrogen gas concn of cabinet 1 inside reaches capacity nitrogen gas concn, the second comparator LM393 output transfers output low level to by exporting high level, and now the second NMOS tube Q2 is in not on-state, and inflation motor M 2 quits work.
Moreover after pressing normally closed button SB2, the K leads ends of JK flip-flop is input as low level, and now JK flip-flop is in and sets high level state; Simultaneously, after normally closed button SB2 presses, the output of reverse delayer transfers high level to by low level, produce pulse signal to pulsed triggering circuit, pulsed triggering circuit output clock pulse signal is to the CL leads ends of JK flip-flop, make the Q leads ends of JK flip-flop export high level, namely the present embodiment returns back to initial condition, realizes resetting.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a quick start switch cabinet, comprises cabinet, and described cabinet is connected with vacuum pumping pump and inflator pump, it is characterized in that: described cabinet has detect aperture, and described cabinet is circumscribed with detection protective device by detect aperture;
Wherein, described detection protective device comprises detecting unit and control unit;
Described detecting unit detects the gas concentration of cabinet inside, and exports transducing signal,
Described control unit couples detecting unit, and controls the work schedule of described vacuum pumping pump and inflator pump according to transducing signal.
2. quick start switch cabinet according to claim 2, is characterized in that: described control unit comprises
First comparing unit, compares the first reference voltage preset and transducing signal, when the first reference voltage first time was greater than described transducing signal, exports the first pulse signal;
Logical block, couples described first comparing unit, and in response to described first pulse signal, to overturn the control signal that it exports;
Vacuum unit, couples described logical block, and according to the high level state of described control signal, controls the unlatching of described vacuum pumping pump, according to the low level state of described control signal, control the closedown of described vacuum pumping pump;
Inflation unit, couples described logical block, and according to the low level state of described control signal, controls the unlatching of described inflator pump, according to the high level state of described control signal, control the closedown of described inflator pump;
Second comparing unit, compares the second reference voltage preset and transducing signal, when the second reference voltage is less than described transducing signal, controls described inflation unit and closes.
3. quick start switch cabinet according to claim 2, is characterized in that: described first comparing unit comprises
First comparator, its normal phase input end receives the first reference voltage, and its inverting input receives described transducing signal;
First single-shot trigger circuit, couples the output of described first comparator, in response to the rising edge pulse that described first comparator exports, to export the first pulse signal.
4. quick start switch cabinet according to claim 2, is characterized in that: described logical block comprises
JK flip-flop, its J leads ends receives the 3rd reference voltage having high level, and its CL leads ends receives described first pulse signal, and its K pin receives power supply signal;
Reset circuit,
Under conventional sense, export the K leads ends of power supply signal to described JK flip-flop of high level,
In the reset state, the power supply signal of output low level, to the K leads ends of described JK flip-flop, exports the CL leads ends of the second pulse signal to described JK flip-flop.
5. quick start switch cabinet according to claim 4, is characterized in that: described reset circuit comprises normally closed button, the normally closed button between described connection power supply and divider resistance;
The K leads ends of described JK flip-flop is coupled between described normally closed button and divider resistance;
Any tie point between described normally closed button and divider resistance is successively by being coupled to the CL leads ends of described JK flip-flop after reverse delayer and the second single-shot trigger circuit.
6. quick start switch cabinet according to claim 2, is characterized in that: described vacuum unit comprises vacuumizing start circuit and the first motor-drive circuit; Wherein,
Described vacuumizing start circuit comprises often opens button, the first NMOS tube, the 3rd resistance, and described one end of often opening button connects power supply, and the other end is successively by ground connection after the first NMOS tube and the 3rd resistance, and its grid couples the output of described logical block;
What described first motor-drive circuit comprised the first bidirectional triode thyristor and vacuum pumping pump vacuumizes motor, one end of described first bidirectional triode thyristor connects power supply, the other end is by vacuumizing ground connection after motor, and it controls pole and is coupled between described first NMOS tube and the 3rd resistance.
7. quick start switch cabinet according to claim 2, is characterized in that: described inflation unit comprises inflation start-up circuit and the second motor-drive circuit; Wherein,
Described inflation start-up circuit comprises normal first PMOS, the second NMOS tube, the 4th resistance, one end of described first PMOS connects power supply, the other end is successively by ground connection after the second NMOS tube and the 4th resistance, its grid couples the output of described second comparing unit, and the grid of described second NMOS tube couples the output of described logical block;
Described second motor-drive circuit comprises the inflation motor of the second bidirectional triode thyristor and inflator pump, and one end of described second bidirectional triode thyristor connects power supply, and the other end is by ground connection after inflation motor, and it controls pole and is coupled between described first PMOS and the 4th resistance.
8. quick start switch cabinet according to claim 7, is characterized in that: described second comparing unit comprises
Second comparator, inverting input receives described transducing signal, and its normal phase input end receives the second default reference voltage, and its output is coupled to the grid of described second NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510621966.1A CN105140818A (en) | 2015-09-25 | 2015-09-25 | Rapidly-starting switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510621966.1A CN105140818A (en) | 2015-09-25 | 2015-09-25 | Rapidly-starting switch cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN105140818A true CN105140818A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510621966.1A Pending CN105140818A (en) | 2015-09-25 | 2015-09-25 | Rapidly-starting switch cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785985A (en) * | 2017-01-21 | 2017-05-31 | 长葛市和合电气有限公司 | The explosion-proof power distribution cabinet of safe class prompting |
| CN111276895A (en) * | 2019-12-14 | 2020-06-12 | 芜湖伊莱特电气有限公司 | Ring main unit for preventing leakage |
-
2015
- 2015-09-25 CN CN201510621966.1A patent/CN105140818A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785985A (en) * | 2017-01-21 | 2017-05-31 | 长葛市和合电气有限公司 | The explosion-proof power distribution cabinet of safe class prompting |
| CN111276895A (en) * | 2019-12-14 | 2020-06-12 | 芜湖伊莱特电气有限公司 | Ring main unit for preventing leakage |
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Application publication date: 20151209 |