CN204794066U

CN204794066U - Safety protection system of AC380V immersible pump in pond

Info

Publication number: CN204794066U
Application number: CN201520502715.7U
Authority: CN
Inventors: 胡迦慈; 刘峰; 高攀
Original assignee: HJC FOUNTAIN EQUIPMENT Co Ltd
Current assignee: Jiangsu Hengyuan fountain Co. Ltd.
Priority date: 2015-07-13
Filing date: 2015-07-13
Publication date: 2015-11-18
Anticipated expiration: 2025-07-13

Abstract

Safety protection system of AC380V immersible pump in pond. Adopt the three -sphase four -wire system 380V alternating current power supply power supply, the three -phase alternating current machine of an earth -leakage protector, the 2nd earth -leakage protector, converter and immersible pump is connected in order to three -phase isolation transformer's secondary end, alternating current power supply's neutral conductor N directly grounded, the casing of immersible pump passes through PU protection of cables and is connected the connecting to neutral protection that constitutes with the secondary neutral conductor N' of three -phase isolation transformer. The utility model discloses a three -phase isolation transformer avoids this an isolation transformer level side low reaches system and external power grid separation the external power grid and disturbs, and the abnormal overvoltage of external power grid assaults the iron shielded layer release that accessible and the earth are connected, protects the insulation of transformer between first secondary. When taking place to cause the system to take place electrical connection with the earth unusually, the trigger action supply interruption that will have priority ensures to be in security range through human electric leakage electric current to protection personnel life safety.

Description

The safety system of AC380V immersible pump in pond

Technical field

The utility model relates to the safety system of AC380V immersible pump in a kind of pond.

Background technology

In recent years, domestic cultural industry high speed development, also the take a shower spring breeze in epoch of waterscape fountain industry is fast-developing, newly-built much have performer to participate in fountain basin and recreation pool, the demand of the AC380V immersible pump that personnel and fountain use in same pond is more and more.Because AC380V is not safe voltage; though current immersible pump electrical shock protection safety system reduces the risk that personnel get an electric shock to a certain extent; but because its safety precautions often only maintains the situation near AC380V for supply power voltage; do not consider that switching overvoltage and lightning overvoltage are to the destruction situation of electric insulation, can not stop the generation of electric shock accidents completely.

Utility model content

The purpose of this utility model is to provide the safety system of AC380V immersible pump in pond; Solve the measure of current immersible pump electrical shock protection safety and generally only maintain the situation near AC380V for supply power voltage; do not consider that switching overvoltage and lightning overvoltage are to the destruction situation of electric insulation; the technical problem of the generation of electric shock accidents can not be stopped completely; when occurring extremely to cause system to occur to be electrically connected with the earth; preferential trigger action is cut off the electricity supply; guarantee that the leakage current through human body is in safe range, to protect human life's safety.

In order to solve the problems of the technologies described above, the utility model provides the safety system of AC380V immersible pump in a kind of pond, adopt three-phase four-wire system 380V ac power supply, three phase line L1, L2 and L3 of AC power are connected respectively to the primary side of three-phase isolation transformer, and the secondary end of three-phase isolation transformer connects the three phase alternating current motor of the first earth leakage protective device, the second earth leakage protective device, frequency converter and immersible pump in turn; The direct ground connection of neutral line N of described AC power, the casing of described immersible pump protects cable and the secondary neutral line N ' of three-phase isolation transformer to be connected to form zero connection protection by PU.

Further, the metal screen layer of ground connection is provided with between the primary and secondary of described three-phase isolation transformer.

Further, the residual operating current≤10mA of described first earth leakage protective device.

Further, the residual operating current≤30mA of described second earth leakage protective device.

Further, described first earth leakage protective device, the second earth leakage protective device and frequency converter are all located in double insulated regulator cubicle.

Further, the submerged cable being IP68 by degree of protection between described frequency converter and the three phase alternating current motor of immersible pump is connected.

Further, described immersible pump is located in insulating shield.

Further, the degree of protection of described immersible pump is IPX8.

Further, the primary side of described three-phase isolation transformer is provided with Surge Protector.

The utility model, compared to existing immersible pump electrical shock protection safety system, has the following advantages:

1. adopt three-phase isolation transformer to be separated with external power grid by this isolating transformer primary side down-stream system, from external power grid interference, the metal screen layer that the abnormal overvoltage of external power grid impacts by being connected with the earth discharges, the insulation between protection transformer primary and secondary; Isolating transformer primary side is installed Surge Protector and is eliminated or weaken Lightning Over-voltage to the impact injury of transformer;

2. the external insulating shield of immersible pump, avoids personnel under water directly to contact with immersible pump, reduces electric shock risk;

3. regulator cubicle meets double insulation standard, cable testing bridge uses isolation material and immersible pump uses the related measures such as insulating shield, ensures that isolating transformer primary side down-stream system and the earth are without any electrical connection;

4. because isolating transformer primary side down-stream system and the earth are without any electrical connection, certain phase and immersible pump chassis contact is caused to cause casing charged even if there is electric leakage, owing to there is no potential difference between casing and the earth, electric shock accidents can not be there is, and protect cable to be connected by PU due to casing and the isolating transformer primary side neutral line, leakage current will flow back to isolating transformer primary side by PU cable, triggers the second earth leakage protective device action power dump, protection personal security;

5., if the abnormal system that causes occurs in system be electrically connected with the earth, preferentially will trigger the first earth leakage protective device action power dump, guarantee that the leakage current through human body is no more than 10mA, to protect human life's safety.

Accompanying drawing explanation

Fig. 1 is the utility model circuit theory diagrams.

In figure: 1. three-phase isolation transformer; 2. the first earth leakage protective device; 3. the second earth leakage protective device; 4. regulator cubicle; 5. immersible pump submerged cable; 6. the external insulating shield of immersible pump; 7.PU protects cable; 8. immersible pump casing; 9. immersible pump three phase alternating current motor; 10. pond; VFD. frequency converter.

Embodiment

By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.

As shown in Figure 1, in pond described in the utility model, the safety system of AC380V immersible pump adopts three-phase four-wire system 380V ac power supply, insulating shield 6 is equipped with outside immersible pump in pond 10, the degree of protection of immersible pump is IPX8, three phase line L1 of AC power, L2 and L3 is connected respectively to the primary side of three-phase isolation transformer 1, the primary side of three-phase isolation transformer 1 is provided with Surge Protector, the secondary end of three-phase isolation transformer 1 connects the first earth leakage protective device 2 in turn, second earth leakage protective device 3, the three phase alternating current motor 9 of frequency converter VFD and immersible pump, the submerged cable 5 being IP68 by degree of protection between frequency converter VFD and the three phase alternating current motor 9 of immersible pump is connected, frequency converter VFD can regulate the rotating speed of the three phase alternating current motor 9 of immersible pump, thus control the water yield of immersible pump, show different effect of fountains, the metal screen layer of ground connection is provided with between the primary and secondary of three-phase isolation transformer 1, residual operating current≤the 10mA of the first earth leakage protective device 2, residual operating current≤the 30mA of the second earth leakage protective device 3, the first earth leakage protective device 2, second earth leakage protective device 3 and the equal VFD of frequency converter are located in double insulated regulator cubicle 4, the utility model adopts TN-S grounding system, the direct ground connection of neutral line N of AC power, and the casing 8 of immersible pump protects cable 7 to be connected to form zero connection protection with the neutral line N ' of three-phase isolation transformer 1 level by PU.

During work, three-phase isolation transformer 1 is adopted to be separated with external power grid by this isolating transformer primary side down-stream system, from external power grid interference, the metal screen layer that the abnormal overvoltage of external power grid impacts by being connected with the earth discharges, the insulation between protection three-phase isolation transformer 1 primary and secondary; Three-phase isolation transformer 1 primary side installs Surge Protector, eliminates or weakens Lightning Over-voltage to the impact injury of three-phase isolation transformer 1; Because three-phase isolation transformer 1 primary side down-stream system and the earth are without any electrical connection, cause casing 8 charged even if generation electric leakage causes certain phase to contact with immersible pump casing 8, owing to there is no potential difference between casing 8 and the earth, electric shock accidents can not be there is, and protect cable 7 to be connected by PU due to casing 8 and three-phase isolation transformer 1 primary side neutral line N ', leakage current will protect cable 7 to flow back to three-phase isolation transformer 1 primary side by PU, trigger the second earth leakage protective device 3 action power dump, protection personal security; If the abnormal system that causes occurs in system be electrically connected with the earth, preferentially will trigger the first earth leakage protective device 2 action power dump, guarantee that the leakage current through human body is no more than 10mA, to protect human life's safety.

With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.

Claims

1. the safety system of AC380V immersible pump in pond, it is characterized in that, adopt three-phase four-wire system 380V ac power supply, three phase line L1, L2 and L3 of AC power are connected respectively to the primary side of three-phase isolation transformer, and the secondary end of three-phase isolation transformer connects the three phase alternating current motor of the first earth leakage protective device, the second earth leakage protective device, frequency converter and immersible pump in turn; The direct ground connection of neutral line N of described AC power, the casing of described immersible pump protects cable and the secondary neutral line N ' of three-phase isolation transformer to be connected to form zero connection protection by PU.

2. the safety system of AC380V immersible pump in pond according to claim 1, is characterized in that, be provided with the metal screen layer of ground connection between the primary and secondary of described three-phase isolation transformer.

3. the safety system of AC380V immersible pump in pond according to claim 1 and 2, is characterized in that, the residual operating current≤10mA of described first earth leakage protective device.

4. the safety system of AC380V immersible pump in pond according to claim 3, is characterized in that, the residual operating current≤30mA of described second earth leakage protective device.

5. the safety system of AC380V immersible pump in pond according to claim 1, it is characterized in that, described first earth leakage protective device, the second earth leakage protective device and frequency converter are all located in double insulated regulator cubicle.

6. the safety system of AC380V immersible pump in pond according to claim 1, it is characterized in that, the submerged cable being IP68 by degree of protection between described frequency converter and the three phase alternating current motor of immersible pump is connected.

7. the safety system of AC380V immersible pump in pond according to claim 1, it is characterized in that, described immersible pump is located in insulating shield.

8. the safety system of AC380V immersible pump in pond according to claim 1, it is characterized in that, the degree of protection of described immersible pump is IPX8.

9. the safety system of AC380V immersible pump in pond according to claim 1, it is characterized in that, the primary side of described three-phase isolation transformer is provided with Surge Protector.