CN204012849U - A kind of portable charger that can automatic decision electric power polarity - Google Patents

Abstract

The utility model discloses a portable charger capable of automatically judging the polarity of a power supply, which comprises a portable charger (1), an output switch (2) of the portable charger, and a protection relay action contact (3), and is characterized in that the protection relay operates The contact point (3) is connected to the polarity detection and judgment device (4), and the polarity detection and judgment device (4) includes the starting module (4-1) of the protective relay, the polarity detection and judgment module (4-2), the light and the sound alarm module (4-3), the starting module (4-1) of the protection relay, the polarity detection and judgment module (4-2), the light and sound alarm module (4-3) are respectively connected with the power busbar of the DC system of the substation (5), The action contacts (3) of the protective relay are connected, and the utility model gives an alarm in time, ensures the safety of the person and equipment, has simple wiring, small workload, and is safe and reliable.

Description

A portable charger capable of automatically judging the polarity of the power supply

Technical field:

The utility model relates to a portable charger capable of automatically judging the polarity of a power supply, which belongs to the technical field of electric power system substation maintenance.

Background technique:

Portable charger is one of the commonly used equipment for maintenance of DC system in substation. When the charging equipment of substation DC system is replaced or fails, it is necessary to use portable charger to replace the charging equipment of DC system. However, due to the long running time of the DC system of the substation and the different environments, some signs of the DC system are unclear. When the portable charger is connected to the power bus of the DC system of the substation, the polarity may be reversed, which will cause a DC short circuit and cause serious accidents. . However, the currently used portable chargers do not have the function of polarity judgment with the power bus of the substation DC system, which poses a great threat to the safety of the staff and the safe operation of the power grid.

Utility model content:

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a portable charger that can automatically determine the polarity of the power supply, is safe and reliable, and provides a timely alarm to ensure the safety of people and equipment, simple wiring, small workload, and safety.

The purpose of this utility model can be achieved through the following measures: a portable charger that can automatically determine the polarity of the power supply, which includes a portable charger, the portable charger is connected to the output switch of the portable charger, and the output switch of the portable charger is connected to the protective relay to act The contact is characterized in that the action contact of the protective relay is connected to a polarity detection and judgment device, the polarity detection and judgment device includes a starting module of the protective relay, the starting module of the protective relay is connected to the polarity detection and judgment module, and the polarity detection and judgment module is connected to the light and the sound alarm module, the starting module of the protection relay, the polarity detection and judgment module, the light and the sound alarm module are respectively connected with the power bus bar of the DC system of the substation and the action contact of the protection relay.

Compared with the prior art, the utility model can produce the following positive effects: the utility model installs a polarity detection and judging device on the output side of the portable charger, and connects the output line of the portable charger with the power bus of the DC system of the substation. When the polarity of the portable charger is opposite to that of the DC system power bus of the substation, the polarity detection and judging device will automatically detect, start the light and sound to warn the staff, and remind the staff to make corrections; at the same time, cut off the output circuit of the portable charger to ensure that it does not happen If the polarity of the power busbar of the DC system of the substation is reversed, so as to ensure the safety of personnel and equipment. Moreover, the device has simple wiring, small workload, and is safe and reliable.

Description of drawings:

Fig. 1 is a structural block diagram of the utility model.

The specific embodiment: below in conjunction with accompanying drawing, the best embodiment of the present utility model is described in detail:

Embodiment: A portable charger that can automatically determine the polarity of the power supply (see Figure 1), which includes a portable charger 1, the portable charger 1 is connected to the output switch 2 of the portable charger, and the output switch 2 of the portable charger is connected to the protection relay to operate Contact 3, the protective relay action contact 3 is connected to the polarity detection and judgment device 4, the polarity detection and judgment device 4 includes the starting module 4-1 of the protective relay, and the starting module 4-1 of the protective relay is connected to the polarity detection and judgment module 4-2, The polarity detection and judgment module 4-2 is connected to the light and sound alarm module 4-3, the starting module 4-1 of the protective relay, the polarity detection and judgment module 4-2, the light and sound alarm module 4-3 are respectively connected with the DC system of the substation The power bus 5 and the protection relay action contact 3 are connected.

After confirming that the output switch 2 of the portable charger is in the off position, the portable charger 1 is connected to the power bus 5 of the DC system of the substation through the output switch 2 of the portable charger, the action contact 3 of the protective relay, and the polarity detection and judgment device 4 . Polarity detection and judgment device 4 is electrified, and polarity detection and judgment module 4-2 wherein begins to carry out polarity judgment, if opposite polarity, polarity detection and judgment module 4-2 starts light, sound alarm module 4-3, sends light, An audible alarm signal informs the staff to pay attention. At the same time, the starting module 4-1 of the protective relay is started, and the protective relay action contact 3 is started by the starting module 4-1 of the protective relay. The output circuit of the portable charger is cut off to ensure that the light and sound alarm modules 4-3 When a fault occurs or the staff makes a mistake and closes the output switch 2 of the portable charger, the output power of the portable charger 1 cannot be connected to the power bus 5 of the DC system of the substation, thereby ensuring that the portable charger and the DC system power of the substation The busbar connection will never reverse the polarity of the power supply at any time.

Claims (1)

1. One kind can automatic decision electric power polarity portable charger, it comprises portable charger (1), portable charger (1) connects portable charger output switch (2), portable charger output switch (2) connects protection relay action connection point (3), it is characterized in that protection relay action connection point (3) connects polarity detection and sentences device (4), polarity detects sentences the startup module (4-1) that device (4) comprises protection relay, the startup module (4-1) of protection relay connects polarity and detects judge module (4-2), polarity detects judge module (4-2) and connects light, aural warning module (4-3), the startup module (4-1) of protection relay, polarity detects judge module (4-2), light, aural warning module (4-3) respectively with transformer station direct current system power source bus (5), protection relay action connection point (3) is connected.