Box-type transformer indoor electromagnetic lock mobile power supply control device

Abstract

The utility model discloses an indoor electromagnetic lock mobile power supply control device for a box-type transformer, which relates to the technical field of power distribution systems and comprises a high-voltage live display, a dry-type transformer, a mobile power supply and an electromagnetic lock control loop which are electrically connected. When the box transformer is normal, the bus side and the dry-type transformer are electrified, the high-voltage electrified display senses the electrified state in the switch cabinet and controls the electromagnetic lock control loop to be disconnected by disconnecting the normally closed node of the relay, the electromagnetic lock mechanical structure is locked, and the net door in the high-voltage chamber is closed; when the box transformer is abnormal, the bus side is powered off, the dry-type transformer loses power, the high-voltage live display induces power loss, the normally closed node of the high-voltage live display is switched on, the electromagnetic lock control loop is switched on, the mobile power supply supplies power to the switched-on electromagnetic lock control loop, the electromagnetic lock mechanical structure is electrically controlled to be unlocked, and the high-voltage indoor net door is opened. The whole unlocking process is convenient, fast, safe, economical and easy to refit and maintain.

Description

Technical Field

[0001] This utility model relates to the field of power distribution system technology, and more specifically to a box-type transformer indoor electromagnetic lock mobile power supply control device. Background Technology

[0002] Currently, some anti-electric shock interlocking devices for box-type transformers install the interlocking unit on the box-type transformer. This interlocking unit is connected to the transformer's live indicator to achieve the live interlocking function. Specifically, when the box-type transformer is energized, the live indicator's interlocking circuit forcibly cuts off the electromagnetic lock's power circuit. Pressing the electromagnetic lock button disables the unlocking indicator light, and the electromagnetic lock locks the cabinet door, preventing unlocking. However, this technical solution has problems: the electromagnetic lock's power is taken from the low-voltage side of the box-type transformer. When the transformer is de-energized, the electromagnetic lock loses power. During maintenance, the transformer needs to be mechanically unlocked using a key under special circumstances. This causes the interlocking circuit in this solution to malfunction. If maintenance personnel do not use the key mechanically according to regulations or accidentally misoperate during unlocking, it can easily lead to danger. Furthermore, the unlocking process is overly complex.

[0003] Later, attempts were made to add an external power source to temporarily power the electromagnetic lock control circuit when the box-type transformer malfunctioned, such as adding a UPS battery. This method is safer and more reliable than key unlocking. However, using a UPS battery to power the electromagnetic lock control circuit requires modifying the internal structure of the box-type transformer, such as changing the wiring method, enlarging holes, welding brackets, adding a UPS power supply and a power switching switch. The modification is difficult and costly. The added UPS battery needs to be replaced regularly, is difficult to repair in case of failure, and needs to be replaced promptly after damage. It is prone to electrical short circuits and fires, which undoubtedly increases the danger sources inside the box-type transformer. Furthermore, this power supply method provides short-term power to the electromagnetic lock control circuit, has poor power supply flexibility, and the overall cost-effectiveness of the solution is low.

[0004] Therefore, how to provide a box-type transformer indoor electromagnetic lock mobile power supply control device that can be applied to new energy wind turbines is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides an indoor electromagnetic lock mobile power supply control device for box-type transformers, which aims to solve the inconvenience of mechanically unlocking the box-type transformer of new energy wind turbines by strictly following the operating procedures with a key when the power is cut off, as well as the problem of poor overall cost performance when using UPS power supply.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dual-power single-circuit electromagnetic lock interlocking device for electric shock protection inside a box-type transformer is disclosed, comprising:

[0008] The system includes a high-voltage live indicator, a dry-type transformer, a mobile power supply, and an electromagnetic lock control circuit. The high-voltage live indicator is connected to the busbar side, its control input terminal is connected in parallel with the power input terminal and connected to the AC live wire of the dry-type transformer or the mobile power supply, and its control output terminal is connected to the power input terminal of the electromagnetic lock control circuit. The power output terminal of the electromagnetic lock control circuit is connected to the AC neutral wire of the dry-type transformer or the mobile power supply and to the power output terminal of the high-voltage live indicator.

[0009] When the transformer is normal, the busbar side is energized, the high-voltage energized indicator senses that the busbar side is energized, the dry-type transformer is energized and controls the normally closed node in the high-voltage energized indicator to open, the electromagnetic lock control circuit is disconnected, the electromagnetic lock mechanical structure is locked, and the high-voltage indoor grid door is closed.

[0010] When the transformer box malfunctions, the busbar side is de-energized, the high-voltage live indicator senses the loss of power on the busbar side, the dry-type transformer is de-energized, the normally closed node in the high-voltage live indicator is connected, the electromagnetic lock control circuit is connected, the mobile power supply supplies power to the connected electromagnetic lock control circuit, the electromagnetic lock mechanical structure is electrically unlocked, the high-voltage indoor grid door is opened, and maintenance personnel can inspect the transformer box.

[0011] Furthermore, the high-voltage live display includes an indicator and a sensor, with the upper end of the sensor connected to the high-voltage bus and the lower end of the sensor connected to the low-voltage side of the indicator;

[0012] The sensor is used to detect whether the busbar side of the switchgear is energized;

[0013] The indicator is used to indicate whether the busbar side of the switchgear is energized.

[0014] Furthermore, the sensor includes three sensors: sensor A, sensor B, and sensor C. The three sensors correspond to the three-phase circuits inside the transformer substation and input the low-voltage signal of the three-phase circuits into the indicator.

[0015] Sensors A, B, and C have the same structure, with an upper flange at their top for connecting to a high-voltage busbar; multiple capacitor cores at different heights around their periphery for splitting the high-voltage signal into a low-voltage signal; a lower flange below the capacitor cores for grounding; and a voltage extraction terminal below the lower flange for extracting the low-voltage signal; the voltage extraction terminal is connected to the low-voltage signal acquisition terminal of the indicator.

[0016] Furthermore, the indicator has eight ports, which are, in order, a power input terminal, a power output terminal, a control input terminal, a control output terminal, a ground terminal, and a three-phase low-voltage signal acquisition terminal; each port has a wiring terminal, which is used for electrical connection with the sensor, the dry-type transformer, the mobile power supply, and the electromagnetic lock control circuit, respectively.

[0017] The indicator's terminals 6-8 are respectively connected to the voltage extraction terminals of the three sensors. Terminal 5 is grounded. Terminals 3 and 1 are connected in parallel and connected to the AC live wire. Terminal 4 is connected to the power input terminal of the electromagnetic lock control circuit. The power output terminal of the electromagnetic lock control circuit is connected to terminal 2 and the AC neutral wire.

[0018] Furthermore, the indicator contains a relay with a locking node, which is connected to the electromagnetic lock control circuit. The two have the same opening state: when the dry-type transformer inside the transformer is energized, the locking node is disconnected; when the dry-type transformer is de-energized, the locking node is connected.

[0019] Furthermore, the electromagnetic lock control circuit includes an electromagnet, an unlocking indicator light, and a current-limiting resistor. The unlocking indicator light and the current-limiting resistor are connected in series, and the series circuit is connected in parallel with the electromagnet. One end of the parallel circuit is connected to the AC neutral wire, and the other end is connected to the power button S. The power button S is connected to the locking node KA in the high-voltage live display, and the locking node KA is connected to the AC live wire.

[0020] Furthermore, it also includes a power switching switch, which is electrically connected to the mobile power supply, the dry-type transformer, the high-voltage live display and the electromagnetic lock control circuit; the power switching switch (6) includes at least two positions, namely the mobile power supply position and the dry-type transformer power supply position, which are used to control the mobile power supply or the dry-type transformer to supply power to the electromagnetic lock control circuit separately.

[0021] Furthermore, the power switching switch includes a fixed end and a free end. The fixed end is connected to the AC live wire, and the free end is movably connected to one power terminal of the portable power supply or the dry-type transformer. The other power terminal of the portable power supply or the dry-type transformer is connected to the AC neutral wire.

[0022] Furthermore, it also includes a power socket, which is connected to the power bank via a plug and a power cord, and is connected to the power switch via the power cord.

[0023] Furthermore, the power switching switch is a three-position rotary switch, with three positions: mobile power supply position, circuit breaker position, and dry-type transformer power supply position. The circuit breaker position isolates the power supply circuits of the mobile power supply and the dry-type transformer from each other, preventing damage to the components of the electromagnetic lock control circuit caused by simultaneous power supply from both power sources.

[0024] When the transformer substation is operating normally, turn the three-position rotary switch to the "dry-type transformer power supply position";

[0025] When the transformer substation is operating abnormally, first turn the three-position rotary switch to the "air circuit breaker position" and then to the "mobile power supply position".

[0026] Similarly, after the maintenance is completed, the three-position rotary switch should first be set to the "air circuit breaker position" and then to the "dry-type transformer power supply position".

[0027] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a box-type transformer indoor electromagnetic lock mobile power supply control device, and the beneficial effects of this device are as follows:

[0028] (1) When the transformer box is normal, the dry-type transformer is energized, the locking node of the high-voltage live indicator is disconnected, the electromagnetic lock control circuit is disconnected, the electromagnetic lock mechanical structure is closed, and the high-voltage grid door is closed; when the transformer box is abnormal, the dry-type transformer is de-energized, the locking node of the high-voltage live indicator and the electromagnetic lock control circuit are both connected, the electromagnetic lock mechanical structure is still closed, the external mobile power supply supplies power to the electromagnetic lock control circuit, the electromagnetic lock mechanical structure is opened by electric control, and the high-voltage grid door is opened. Compared with using a key for mechanical unlocking, it is more convenient, faster and safer.

[0029] (2) Using a mobile power supply to power the electromagnetic lock control circuit is easier to modify, lower in cost, easier to use and easier to maintain than an external UPS battery. It will not increase the danger source inside the transformer box. It has high power supply reliability and good flexibility. The overall cost performance of this solution is high.

[0030] (3) When the mobile power supply and the dry-type transformer are controlled by a three-position rotary switch to supply power to the electromagnetic lock control circuit, there is a circuit breaker position to isolate the power supply circuits of the two power supplies from each other, so as to prevent the external mobile power supply from feeding back power to the dry-type transformer through the control circuit. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the box-type transformer indoor electromagnetic lock mobile power supply control device disclosed in this utility model.

[0033] Figure 2 for Figure 1 Circuit diagram of a dual-power single electromagnetic lock control circuit;

[0034] Among them, 1 is a high-voltage live display; 11 is an indicator; 12 is a sensor; 121 is an upper flange; 122 is a lower flange; 123 is a capacitor core; 124 is a voltage extraction terminal; 2 is an electromagnetic lock control circuit; 3 is a dry-type transformer; 4 is a mobile power supply; 5 is an aviation power socket; and 6 is a power switching switch. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] like Figure 1 As shown, this embodiment discloses an indoor electromagnetic lock mobile power supply control device for a box-type transformer, including: a high-voltage live indicator 1, an electromagnetic lock control circuit 2, a dry-type transformer 3, and a mobile power supply 4. The high-voltage live indicator 1 is connected to the bus side, its control input terminal is connected in parallel with the power input terminal and connected to the AC live wire L of the dry-type transformer 3 or the mobile power supply 4, and its control output terminal is connected to the power input terminal of the electromagnetic lock control circuit 2; the power output terminal of the electromagnetic lock control circuit 2 is connected to the AC neutral wire N of the dry-type transformer 3 or the mobile power supply 4 and connected to the power output terminal of the high-voltage live indicator 1.

[0037] When the transformer is normal, the busbar side is energized, the high voltage energized indicator 1 senses that the busbar side is energized, the dry-type transformer 3 is energized and controls the normally closed node KA in the high voltage energized indicator 1 to open, the electromagnetic lock control circuit 2 is opened, the electromagnetic lock mechanical structure is locked, and the high voltage indoor grid door is closed.

[0038] When the transformer box malfunctions, the busbar side is de-energized, the high-voltage live indicator 1 senses the loss of power on the busbar side, the dry-type transformer 3 is de-energized, the normally closed node KA in the high-voltage live indicator 1 is connected, the electromagnetic lock control circuit 2 is connected, the mobile power supply 4 supplies power to the connected electromagnetic lock control circuit 2, the electromagnetic lock mechanical structure is unlocked by electronic control, and the high-voltage indoor grid door is opened.

[0039] In this embodiment, the high-voltage live display 1 includes an indicator 11 and a sensor 12. The upper end of the sensor 12 is connected to the high-voltage bus, and the lower end of the sensor 12 is connected to the indicator 11 on the low-voltage side.

[0040] Sensor 12 is used to detect whether the busbar side in the switch cabinet is energized;

[0041] Indicator 11 is used to indicate whether the busbar side of the switch cabinet is energized.

[0042] In this embodiment, sensor 12 includes three sensors: sensor A, sensor B, and sensor C. The three sensors correspond to the three-phase circuit in the transformer substation and input the low-voltage signal of the three-phase circuit into indicator 11.

[0043] Sensors A, B, and C have the same structure. They are equipped with an upper flange 121 at their upper end for connecting to the high-voltage busbar. Multiple capacitor cores 123 are installed at different heights around them to split the high-voltage signal into a low-voltage signal. A lower flange 122 is installed below the capacitor cores 123 for grounding. A voltage extraction terminal 124 is installed below the lower flange 122 for extracting the low-voltage signal. The voltage extraction terminal 124 is connected to the low-voltage signal acquisition terminal of the indicator 11.

[0044] In this embodiment, the indicator 11 has eight ports, which are, in order, a power input terminal, a power output terminal, a control input terminal, a control output terminal, a ground terminal, and a three-phase low-voltage signal acquisition terminal; each port has a wiring terminal, which is used for electrical connection with the sensor 12, the dry-type transformer 4, the mobile power supply 3, and the electromagnetic lock control circuit 2, respectively.

[0045] Terminals 6 to 8 of indicator 11 are connected to the voltage extraction terminals 124 of the three sensors 12 respectively. Terminal 5 is grounded. Terminals 3 and 1 are connected in parallel and connected to the AC live wire. Terminal 4 is connected to the power input terminal of the electromagnetic lock control circuit. The power output terminal of the electromagnetic lock control circuit is connected to terminal 2 and the AC neutral wire.

[0046] In this embodiment, the indicator 11 contains a relay with a locking node KA. When the dry-type transformer 3 inside the transformer substation is energized, the locking node KA is disconnected; when the dry-type transformer 3 is de-energized, the locking node KA is connected.

[0047] In this embodiment, the electromagnetic lock control circuit 2 includes an electromagnet, an unlock indicator light H, and a current-limiting resistor R; the unlock indicator light H and the current-limiting resistor R are connected in series, and the series circuit is connected in parallel with the electromagnet; one end of the parallel circuit is connected to the AC neutral line N, and the other end is connected to the power button S. The power button S is connected to the locking node KA in the high-voltage live display 1, and the locking node KA is connected to the AC live line L.

[0048] In this embodiment, a power switching switch 6 is also included. Figure 2 In the diagram, QA represents the power switching switch 6. The power switching switch 6 is electrically connected to the power bank 4, the dry-type transformer 3, the high-voltage live display 1, and the electromagnetic lock control circuit 2. The power switching switch 6 includes at least two positions: a power bank power supply position and a dry-type transformer power supply position, which are used to control the power bank 4 or the dry-type transformer 3 to supply power to the electromagnetic lock control circuit 2 separately.

[0049] In this embodiment, the power switching switch 6 includes a fixed end and a free end. Figure 2 The fixed end of the power switching switch 6 is connected to the AC live wire L, and the free end is movably connected to one power terminal of the mobile power supply 4 or the dry-type transformer 3. The other power terminal of the mobile power supply 4 and the dry-type transformer 3 is connected to the AC neutral wire N.

[0050] In this embodiment, a power socket 5 is also included. The power socket 5 is connected to the power bank 4 via a plug and a power cord, and the power socket 5 is connected to the power switching switch 6 via a power cord.

[0051] In this embodiment, the power socket 5 is an aviation power socket without a power button. This power socket enables quick connection of the mobile power supply 4 while ensuring the safety of the staff when temporary power is connected.

[0052] In this embodiment, the power switching switch 6 is a three-position rotary switch, which includes three positions: a mobile power supply position, a circuit breaker position, and a dry-type transformer power supply position. The three positions are electrically interlocked. The circuit breaker position is used to isolate the power supply circuits of the mobile power supply 4 and the dry-type transformer 3 from each other, preventing damage to the components in the electromagnetic lock control circuit caused by the simultaneous supply of two power sources.

[0053] In this embodiment, the external power supply 4 is selected as a small-to-medium capacity power supply that is easy to carry and has leakage protection. The power supply is connected using a three-pronged power cord, which is very convenient and quick to connect. At the same time, it can ensure the safety and reliability of the operator when the power supply is connected. In addition, the three-pronged power cord used in this embodiment is of good quality, durable, and suitable for harsh power supply environments.

[0054] The normal locking logic criterion for the electromagnetic lock is as follows: when the transformer is normally energized, the normally closed node KA of the high-voltage energized indicator 1 is disconnected, which disconnects the electromagnetic lock control circuit 2, and the electromagnetic lock mechanical structure is locked, making it impossible to open the high-voltage indoor grid door.

[0055] The normal unlocking logic of the electromagnetic lock is as follows: When the transformer substation is de-energized, the normally closed contact KA of the high-voltage live display 1 is turned on, which connects the electromagnetic lock control circuit. Usually, when the transformer substation is not energized, an unlocking key is required for unlocking. If the maintenance personnel do not use the unlocking key according to the specifications, there is a certain risk of misoperation and safety. However, this embodiment uses an external mobile power supply for electronic unlocking, which has high unlocking efficiency and avoids the safety factors of mechanical unlocking operation.

[0056] Of course, there are existing technologies that use external UPS batteries to power the electromagnetic lock control circuit 2. However, compared with the technology proposed in this embodiment that uses a portable, small-capacity mobile power supply with leakage protection, the latter has more advantages. For example, each station only needs about two mobile power supplies, and the cost of upgrading 100 transformer substations can be controlled within 10,000 yuan. In contrast, the cost of UPS spare parts for 100 transformer substations using external UPS batteries is as high as 450,000 yuan. In addition, the cost of the power supply circuit modification components and labor costs can reach more than 600,000 yuan for the upgrade of 100 transformer substations. This technology is not well adapted to the batch upgrade of existing transformer substations. Its upgrade cost is high, the upgrade is difficult, and it is inconvenient to maintain in the later stage. Therefore, the upgrade solution proposed in this application has obvious advantages in terms of cost, construction period control, and later maintenance.

[0057] In this embodiment, the disclosed indoor electromagnetic lock mobile power supply control device for box-type transformers is more suitable for the electric opening of electromagnetic locks and high-voltage grid doors inside box-type transformers of new energy wind turbines. Whether using an aviation power socket or a three-prong power cord, it is suitable for application in harsh environments.

[0058] In addition, the spare parts used in the technical solution of this embodiment are maintenance-free in the transformer substation, have a wider range of environmental temperature adaptability, and are more stable in extreme weather conditions in the area where the new energy power station is located. The mobile power supply used is stored in the power station and managed as a power station electrical appliance, and is checked and charged monthly, resulting in high power supply reliability.

[0059] In later use, there is no need to disassemble and reassemble the secondary circuit wiring of the electromagnetic lock, avoiding the risk of protection malfunction and electric shock caused by personnel's incorrect wiring. The operation only requires two steps: plug in the external mobile power supply and rotate the power switch to the mobile power supply position. When removing, there is no need to restore the wiring. The two steps are completed in reverse order.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A box-type transformer indoor electromagnetic lock mobile power supply control device, characterized by, The utility model relates to a high voltage live display (1), electromagnetic lock control loop (2), dry type transformer (3) and mobile power (4), the high voltage live display (1) is connected with bus side, and its control input is parallel with power input and is connected with the alternating current live wire of dry type transformer (3) or mobile power (4), and its control output is connected with the power input of electromagnetic lock control loop (2), the power output of electromagnetic lock control loop (2) is connected with the alternating current zero line of dry type transformer (3) or mobile power (4) and the power output of high voltage live display (1), When the box transformer is normal, the bus side is live, the high voltage live display (1) senses the bus side live, the dry type transformer (3) is live and controls the normally closed node in the high voltage live display (1) to disconnect, the electromagnetic lock control loop (2) is disconnected, the electromagnetic lock mechanical structure is locked, and the high voltage chamber net door is closed. When the box transformer is abnormal, the bus side is de-energized, the high voltage live display (1) senses the bus side de-energized, the dry type transformer (3) is de-energized, the normally closed node in the high voltage live display (1) is connected, the electromagnetic lock control loop (2) is connected, the mobile power (4) supplies power to the connected electromagnetic lock control loop (2), the electromagnetic lock mechanical structure is unlocked, and the high voltage chamber net door is opened. The high voltage live display (1) includes an indicator (11) and a sensor (12), the upper end of the sensor (12) is connected to a high voltage bus, and the lower end of the sensor (12) is connected to the indicator (11) on the low voltage side; 2. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 1, characterized in that, The sensor (12) is used for sensing whether the bus side in the switch cabinet is live. The indicator (11) is used for prompting whether the bus side in the switch cabinet is live. The sensor (12) includes three sensors A, B and C, which correspond to three-phase circuits in the box transformer respectively, and input low voltage signals of the three-phase circuits into the indicator (11); 3. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 2, characterized in that, The sensors A, B and C have the same structure, and an upper flange (121) is arranged at the upper end of each sensor for connecting the high voltage bus; A plurality of capacitor core rods (123) are arranged at different heights on the periphery of each sensor for dividing the high voltage signals into low voltage signals, a lower flange (122) is arranged below each capacitor core rod (123) for grounding, a voltage extraction end (124) is arranged below the lower flange (122) for extracting the low voltage signals, and the voltage extraction end (124) is connected to a low voltage signal collection end of the indicator (11). The indicator (11) has eight ports, which are a power input end, a power output end, a control input end, a control output end, a grounding end and three-phase low voltage signal collection ends in sequence, each port has a terminal for electrical connection with the sensor (12), the dry type transformer (3), the mobile power (4) and the electromagnetic lock control loop (2).

4. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 2, characterized in that, ​ The wiring terminals 6-8 of the indicator (11) are respectively connected with the voltage extraction ends (124) of the three sensors (12), the wiring terminal 5 is grounded, the wiring terminal 3 and the wiring terminal 1 are connected in parallel and connected with the AC live wire, the wiring terminal 4 is connected with the power input end of the electromagnetic lock control circuit, and the power output end of the electromagnetic lock control circuit is connected with the wiring terminal 2 and the AC zero line.

5. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 2, characterized in that, The indicator (11) has a relay, and the relay has a locking node which is disconnected when the dry-type transformer (3) in the box transformer is electrified, and the locking node is connected when the dry-type transformer (3) is de-energized.

6. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 1, characterized in that, The electromagnetic lock control circuit (2) comprises an electromagnet, an unlocking indicator lamp and a current limiting resistor; the unlocking indicator lamp and the current limiting resistor are connected in series, and the series circuit is connected in parallel with the electromagnet; one end of the parallel circuit is connected with the AC zero line, and the other end is connected with a power button, the power button S is connected with the locking node KA in the high-voltage electrification display (1), and the locking node KA is connected with the AC live wire.

7. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 1, characterized in that, Further comprising a power switching switch (6), the power switching switch (6) is electrically connected with the mobile power supply (4), the dry-type transformer (3), the high-voltage electrification display (1) and the electromagnetic lock control circuit (2); the power switching switch (6) comprises at least two gears, which are a mobile power supply power supply gear and a dry-type transformer power supply gear, respectively, for controlling the mobile power supply (4) or the dry-type transformer (3) to supply power to the electromagnetic lock control circuit (2) alone.

8. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 7, characterized in that, The power switching switch (6) comprises a fixed end and a free end, the fixed end is connected with the AC live wire, and the free end is movably connected with one power supply end of the mobile power supply (4) or the dry-type transformer (3), and the other power supply end of the mobile power supply (4) and the dry-type transformer (3) is connected with the AC zero line.

9. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 7, characterized in that, Further comprising a power socket (5), the power socket (5) is connected with the mobile power supply (4) through a plug and a power line, and the power socket (5) is connected with the power switching switch (6) through a power line.

10. The cabinet transformer indoor type electromagnetic lock mobile power supply control device according to claim 7, characterized in that, The power switching switch (6) is a three-gear rotary switch, which comprises three gears, namely a mobile power supply power supply gear, an air switch gear and a dry-type transformer power supply gear, and the three gears are electrically interlocked; wherein, the air switch gear is used for isolating the power supply circuits of the mobile power supply (4) and the dry-type transformer (3) from each other. The power switching switch (6) is a three-gear rotary switch, which comprises three gears, namely a mobile power supply power supply gear, an air switch gear and a dry-type transformer power supply gear, and the three gears are electrically interlocked; wherein, the air switch gear is used for isolating the power supply circuits of the mobile power supply (4) and the dry-type transformer (3) from each other.

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