Large capacity double switching power supply device and working method thereof

Abstract

The present invention proposes a large-capacity dual-switching power supply device and a working method thereof, characterized in that it comprises: a battery module, an inverter, an AC contactor, a first circuit breaker QF1 and a second circuit breaker QF2; the positive and negative poles of the battery module are connected to the power output port via the inverter, the normally closed contact KM1 of the AC contactor and the second circuit breaker QF2; the positive and negative poles of the battery module are connected to the power input port via the inverter, the normally closed contact KM1 of the AC contactor, the normally open contact KM2 of the AC contactor and the first circuit breaker QF1; the coil KM of the AC contactor is located between the normally open contact KM2 of the AC contactor and the first circuit breaker QF1, and the two ends are respectively on both sides of the circuit. It can meet the long-term charging requirements of the ring network cabinet; the AC contactor is used as a switching device, and when the ring network cabinet is powered on, the device stops outputting power to save electricity. The device can be placed inside the ring network cabinet, and there is no need to send people to guard the device on site.

Description

Technical Field

[0001] The present invention belongs to the technical field of power distribution network operation and maintenance, and in particular relates to a large-capacity dual-switching power supply device and a working method thereof. Background Art

[0002] In the water conservancy and power industries, many electrical equipment are widely used for their superior performance. Ring main unit is one of them. The ring main unit has stable electrical performance and beautiful appearance, and is widely used in distribution networks. However, there is a problem. At present, most ring main units are equipped with electric operating mechanisms, and the backup power supply of the ring main unit has become a bottleneck restricting the remote control operation of the ring main unit. According to the power distribution process, the backup power supply has been working from the time when the newly built ring main unit is inspected on site to the time when the remote control power is transmitted. When the power dispatching department transmits power remotely, the backup power supply is out of power, resulting in the inability to close the switch and transmit power remotely, thereby affecting the success rate of remote control operation. At the same time, in the construction process of remote water conservancy projects, because there is no power supply for construction, simple construction equipment (such as handheld concrete vibrators) cannot be used. At this stage, the fuel used by the generator is diesel or gasoline, which is a flammable item. There are great safety hazards in storing and using it at the construction site in the hot summer. Summary of the invention

[0003] In view of the defects and shortcomings of the existing solutions, the present invention provides a large-capacity dual-switching power supply device and a working method thereof, which are used to solve the problem of insufficient backup power supply of the ring network cabinet.

[0004] The specific technical solutions are as follows:

[0005] A large-capacity dual-switching power supply device, characterized in that it includes: a battery module, an inverter, an AC contactor, a first circuit breaker QF1 and a second circuit breaker QF2; the positive and negative output lines of the battery module are connected to the power output port via the inverter, the normally closed contact KM1 of the AC contactor and the second circuit breaker QF2; the positive and negative output lines of the battery module are connected to the power input port via the inverter, the normally closed contact KM1 of the AC contactor, the normally open contact KM2 of the AC contactor and the first circuit breaker QF1; the coil KM of the AC contactor is located between the normally open contact KM2 of the AC contactor and the first circuit breaker QF1, with two ends having two side lines.

[0006] Preferably, the battery module comprises a battery group consisting of at least two batteries B1 and B2 connected in series; the battery module is respectively connected to the inverter and the battery charging port via two contacts of a third circuit breaker QF3.

[0007] Preferably, the battery B1 is connected to the first power detection module M1 via a rocker switch QF4 to form a first power detection circuit; the battery B2 is connected to the second power detection module M2 via a rocker switch QF5 to form a second power detection circuit.

[0008] Preferably, the power input port is connected to the secondary side of the voltage transformer of the ring main unit; the power output port is connected to the charging and discharging module of the ring main unit and provides operating power for the ring main unit.

[0009] Preferably, indicator lights are provided on the load sides of the first circuit breaker QF1 and the second circuit breaker QF2, respectively.

[0010] Preferably, the different batteries are respectively arranged in different device cabinets.

[0011] And according to one of the above preferred device working methods, it is characterized by comprising the following steps:

[0012] Step A1: Disconnect the first circuit breaker QF1 and the second circuit breaker QF2, and close the rocker switch QF4 and the rocker switch QF5;

[0013] Step A2: Remove the power side wires of the secondary side power supplies B641 and C641 of the ring main unit PT, clamp the wires of the power input port on the wires of the power side of B641 and C641, and clamp the wires of the power output port on the wires of the load side of B641 and C641;

[0014] Step A3: Close the first circuit breaker QF1 and the second circuit breaker QF2, and turn the third circuit breaker QF3 to position 1 for connecting to the inverter.

[0015] And according to the second working method of the above preferred device, it is characterized in that: the rocker switch QF4 and the rocker switch QF5 are disconnected, the third circuit breaker QF3 is switched to the battery charging port position 2, and the charger output power line is connected to the battery charging port.

[0016] The present invention and its preferred solution can meet the long-term charging requirements of the ring main unit; an AC contactor is used as a switching device. When the ring main unit is powered on or the construction of the water conservancy project construction equipment is completed, the device stops outputting power to save electricity. The device can be placed inside the ring main unit, and there is no need to send someone to guard the device on site. The device can also be used in flood prevention and rescue and other places where emergency power supply is required, as a lighting power source or a power source for electric tools (handheld concrete vibrators, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 It is a schematic diagram of the circuit principle of an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the external structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the features and advantages of this patent more obvious and easy to understand, the following embodiments are specifically described in detail as follows:

[0021] like Figure 1 As shown, the device of this embodiment uses two large-capacity batteries connected in series to form a battery pack for use in conjunction with an inverter. The DC power of the battery is converted into AC mains power by the inverter, and the mains power is output to the power supply side of the QF2 circuit breaker through the normally closed contacts of the AC contactor. After the circuit breaker is closed, the mains power is output to the charging and discharging module of the ring main cabinet to charge the backup power supply and provide operating power.

[0022] The secondary side (B641, C641) of the voltage transformer of the ring main unit is connected to the power supply side of the QF1 circuit breaker of the device. When the ring main unit is powered, B641 and C641 generate 220V power. The power passes through the AC contactor coil KM through the QF1 circuit breaker. The coil is energized, the AC contactor is activated, the normally closed contact of KM1 disconnects the inverter and stops outputting 220V inverter power, and the normally open contact of KM2 closes and outputs B641 and C641 power to the charge and discharge module of the ring main unit. An indicator light is provided on the load side of the QF1 and QF2 circuit breakers to prompt the device to input and output power.

[0023] In addition, a battery power detection module is installed on the battery side to detect the remaining battery power in real time. The module is connected in series with a boat-shaped switch, which can disconnect the module when the battery is charging.

[0024] The device is designed to look like Figure 2 As shown, it is composed of two device cabinets. Cabinet 1 is the main part of the device, and is composed of aluminum alloy square tubes and slot tubes to form a frame. It contains battery B1, AC contactor, circuit breaker QF1, QF2, indicator light 1, indicator light 2, inverter, power detection module, and boat switch; cabinet 2 is composed of aluminum alloy square tubes and slot tubes to form a frame, and has built-in battery B2. Cabinet 1 and cabinet 2 are connected in series through power wires to form a circuit.

[0025] According to the above device provided in this embodiment, during normal use: first disconnect the circuit breakers QF1 and QF2, close the ship-type switches QF4 and QF5, then remove the power side wires of the secondary side power supply B641 and C641 of the ring main unit PT, clamp the wires at the power supply end of the circuit breaker QF1 on the wires on the power supply side of B641 and C641, then clamp the load side wires of the circuit breaker QF2 on the load side wires of B641 and C641, finally, close the circuit breakers QF1 and QF2, and turn QF3 to position 1. At this time, the device starts working, providing operating power for the operating circuit of the ring main unit and charging power for the backup power supply.

[0026] When the device is charging, disconnect QF4 and QF5, turn QF3 to position 2, and connect the charger output power cable to the device charging port.

[0027] This patent is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of large-capacity dual-switching power supply devices and their working methods under the inspiration of this patent. All equal changes and modifications made according to the scope of the patent application of the present invention should be covered by this patent.

Claims

1. A large-capacity double-switching power supply device, characterized in that: include: A battery module, an inverter, an AC contactor, a first circuit breaker QF1 and a second circuit breaker QF2; The positive and negative output wires of the battery module are connected to the power output port via the inverter, the normally closed contact KM1 of the AC contactor and the second air switch QF2; the positive and negative output wires of the battery module are connected to the power input port via the inverter, the normally closed contact KM1 of the AC contactor, the normally open contact KM2 of the AC contactor and the first air switch QF1; The coil KM of the AC contactor is located between the normally open contact KM2 of the AC contactor and the first circuit breaker QF1, and its two ends are connected to the two side lines respectively; The battery module includes a battery pack consisting of at least two batteries B1 and B2 connected in series; the battery module is respectively connected to the inverter and the battery charging port via two contacts of the third circuit breaker QF3; The battery B1 is connected to the first power detection module M1 through the rocker switch QF4 to form a first power detection circuit; the battery B2 is connected to the second power detection module M2 through the rocker switch QF5 to form a second power detection circuit; The power input port is connected to the secondary side of the voltage transformer of the ring network cabinet; the power output port is connected to the charging and discharging module of the ring network cabinet and provides operating power for the ring network cabinet; The load sides of the first circuit breaker QF1 and the second circuit breaker QF2 are respectively provided with indicator lights; Different storage batteries are respectively arranged in different device cabinets; Its working method comprises the following steps: Step A1: Disconnect the first circuit breaker QF1 and the second circuit breaker QF2, and close the rocker switch QF4 and the rocker switch QF5; Step A2: Remove the power side wires of the secondary side power supplies B641 and C641 of the ring main unit PT, clamp the wires of the power input port on the wires of the power side of B641 and C641, and clamp the wires of the power output port on the wires of the load side of B641 and C641; Step A3: Close the first circuit breaker QF1 and the second circuit breaker QF2, and turn the third circuit breaker QF3 to position 1 for connecting to the inverter; Disconnect the rocker switch QF4 and the rocker switch QF5, switch the third circuit breaker QF3 to the battery charging port position 2, and connect the charger output power line to the battery charging port.

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