CN207719884U - A kind of movable type AC/DC integrated Power supply alteration load transfer device - Google Patents

Abstract

The utility model provides a mobile AC-DC integrated power supply transformation load transfer device. The three-phase bus in the AC load transfer cabinet is connected to two station transformers. An AC air switch is arranged between the three-phase bus and the station transformer. The two AC A dual-power automatic transfer switch is connected between the air switches. The transfer switch and voltmeter are connected in series and connected to the three-phase busbar. Low-voltage relays, fuses, and AC alarm terminal blocks are connected in series and connected to the three-phase busbar. Inside the AC load transfer cabinet Set multiple AC load switches, the DC bus in the DC load transfer cabinet is connected to two DC air switches, respectively connected to the mobile charger and the battery pack, the voltmeter and the low-voltage relay are connected to the DC bus, and the DC bus is electrically connected to the DC The insulation monitoring device, the low-voltage relay and the DC insulation monitoring device are all electrically connected to the measurement and control device, and a plurality of DC load switches are arranged inside the DC load transfer cabinet. The load transfer of the utility model is safe and reliable, and has high efficiency.

Description

A mobile AC-DC integrated power supply transformation load transfer device

technical field

The utility model belongs to the technical field of transformation of substations, and in particular relates to a mobile AC-DC integrated power supply transformation load transfer device.

Background technique

With the rapid development of power grid technology, the degree of automation of the power system continues to increase, and the requirements for it are getting higher and higher. Whether the relay protection device can operate reliably depends on the reliability of the station AC and DC power supply system. In recent years, with the increasing obsolescence of AC and DC devices in the station power system, the integration of AC and DC in existing substations has become more and more serious. At present, the method of transferring AC and DC loads to temporary disks and using temporary charging devices to provide DC power is adopted when transforming AC and DC integrated power supplies in substations.

For the 110kV unattended substation of the single-power single-charge DC power system, DC open circuit, short circuit or grounding faults are prone to occur during the integrated transformation process using this method, resulting in the loss of DC power supply, the relay protection device cannot operate normally, and cannot be timely It was found that there were major safety hazards in the restoration of power supply; the simultaneous transfer of AC and DC loads could not be realized during the load transfer process, resulting in low work efficiency; in addition, due to the limitation of the number of temporary disk switches, for substations with a lot of loads, a single switch cannot be realized Controlling a single loop causes inconvenience in operation.

The patent with the notification number CN107069931A discloses a mobile substation DC load transfer device. The front of the box is provided with an AC input port, a storage battery input port and a feeder output port, and the inside of the box is provided with a switch for converting AC power into DC power. Charging module; the AC input port is connected to an external AC power supply, the battery input port is connected to an external battery pack, and the feeder output port provides single or multiple DC outputs. An AC air switch for controlling AC power input is also arranged on the front of the box. A feeder switch for controlling the output of each feeder is also arranged on the front of the box. A feeder indicator light for indicating the output of each feeder is also arranged on the front of the box. The invention can avoid the power loss of the electrical equipment in the station during the transformation of the AC and DC system, and improves the efficiency and safety. However, its scope of application is small, and it cannot be used for the transformation of the AC system. Moreover, its power supply mode is single, and its safety and reliability are weak.

Contents of the invention

In view of this, the utility model aims at the deficiencies of the prior art, and provides a mobile AC-DC integrated power supply transformation transfer device that is safe and reliable, has high load transfer efficiency and can simultaneously transfer AC and DC loads.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a mobile AC-DC integrated power source transformation load transfer device, including an AC load transfer cabinet and a DC load transfer cabinet, and the AC load transfer cabinet is equipped with three Phase bus, the three-phase bus is connected to two station transformers, an AC air switch is set between the three-phase bus and the station transformer, and a dual-power automatic switch is connected between the two AC air switches, The front shell of the AC load transfer cabinet is provided with a voltmeter, a transfer switch, and three low-voltage relays. The voltmeter and the transfer switch are connected in series and connected to the three-phase bus. The alarm terminal block is connected in parallel and connected to the three-phase busbar, the AC alarm terminal block is electrically connected to a measurement and control device, and a plurality of AC load switches electrically connected to the three-phase busbar are arranged inside the AC load transfer cabinet;

A DC bus bar is arranged on the top of the DC load transfer cabinet, and the DC bus bar is connected to two DC air switches, the first DC air switch is connected to the DC output end of the mobile charger, and the second DC air switch is connected to the battery pack. The AC input terminal of the mobile charger is electrically connected to one of the AC load switches, and the front shell of the DC load transfer cabinet is provided with a voltmeter and a DC low-voltage relay, and the voltmeter and the DC low-voltage relay are all connected to the The DC bus is electrically connected, the DC bus is electrically connected to a DC insulation monitoring device, the DC low voltage relay and the DC insulation monitoring device are both electrically connected to the measurement and control device, and the DC load transfer cabinet is internally equipped with multiple The DC load switch is electrically connected to the DC bus.

Preferably, wheels with brakes are provided at the bottom of the AC load transfer cabinet and the DC load transfer cabinet, and both the AC load transfer cabinet and the DC load transfer cabinet are provided with front and rear doors.

Preferably, both the AC load switch and the DC load switch are arranged in multiple layers.

Preferably, a partition is provided at the lower part of the DC load transfer cabinet, and the battery pack is placed under the partition.

Preferably, handles with locks are provided on the fronts of the AC load transfer cabinet and the DC load transfer cabinet.

Compared with the prior art, the beneficial effects of the utility model are as follows:

The utility model improves the existing load transfer device, so that it not only transfers the load safely and reliably, but also realizes the transfer of AC and DC loads at the same time, and has high working efficiency. The utility model can realize the simultaneous transfer of AC and DC loads in the process of substation AC and DC transformation, saves construction time, reduces the abnormal operation time of the station AC and DC system, and can ensure the overall installation and debugging of the new integrated power supply system, with high The two substation transformers in the AC load transfer cabinet provide 380v three-phase AC power, and the dual power supply automatic switch is connected between the two station substations, which can realize one way of working and one way of standby, and one way of backup when the power is lost. One-way automatic power supply improves the reliability of the load transfer device. The three-phase bus is connected to a voltmeter, a low-voltage relay, and a measurement and control device to monitor the voltage status of the AC bus. When a fault occurs, an alarm signal can be sent and uploaded to the background for monitoring. Mobile charging The AC input terminal of the machine is connected to the load circuit breaker in the AC load transfer cabinet, and the DC output terminal is connected to the first DC air switch in the DC load transfer cabinet, and the second DC air switch is connected to the battery pack. During normal operation, the battery pack It is connected to the mobile charger and is in the state of floating charge. If the AC is lost, the battery will supply power to ensure the safety and reliability of the DC load transfer cabinet. The loss of voltage alarm function improves the power supply reliability of the AC and DC system for the station and ensures the safe operation of the power grid.

In addition, the bottom of the AC load transfer cabinet and the DC load transfer cabinet are equipped with brake wheels, which can not only fix the cabinet in one place but also facilitate movement. The AC load transfer cabinet and the DC load transfer cabinet are equipped with front and rear doors. It is convenient for the installation and disassembly of AC and DC loads and the control of the device. Both the AC load switch and the DC load switch are arranged in multiple layers, and the load switch configuration is sufficient, which can realize a single air switch to control a single circuit, and is applicable to substations and battery packs of different voltage levels. Placed in the DC load transfer cabinet, it saves space and is convenient to use. Both the AC load transfer cabinet and the DC load transfer cabinet are equipped with lockable handles on the front to ensure the safe operation of the load transfer cabinet.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the circuit diagram of the AC load transfer cabinet of the utility model embodiment;

Fig. 3 is a circuit diagram of the DC load transfer cabinet of the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the utility model. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

As shown in Figures 1 to 3, a mobile AC-DC integrated power supply transformation load transfer device includes an AC load transfer cabinet 1 and a DC load transfer cabinet 2, and the AC load transfer cabinet 1 is provided with a three-phase busbar. The three-phase busbar is connected to two substation transformers, an AC air switch is set between the three-phase busbar and the station transformer, and a dual-power automatic switching switch is connected between the two AC air switches, and the AC load transfer The front shell of the cabinet 1 is provided with a voltmeter 3, a changeover switch 5, and three low-voltage relays 4. The voltmeter 3 and the changeover switch 5 are connected in series and connected to the three-phase bus bar. The low-voltage relay 4, fuse . The AC alarm terminal row is connected in parallel and connected to the three-phase busbar, the AC alarm terminal row is electrically connected to a measurement and control device, and a plurality of AC load switches electrically connected to the three-phase busbar are arranged inside the AC load transfer cabinet;

The top of the DC load transfer cabinet 2 is provided with a DC bus bar, the DC bus bar is connected to two DC air switches, the first DC air switch is connected to the DC output end of the mobile charger 7, and the second DC air switch is connected to the battery pack 11 , the AC input end of the mobile charger 7 is electrically connected to one of the AC load switches, and the front shell of the DC load transfer cabinet is provided with a voltmeter 8 and a DC low-voltage relay 9, and the voltmeter 8 and the DC The low-voltage relays 9 are all electrically connected to the DC bus, the DC insulation monitoring device is electrically connected to the DC bus, and the DC low-voltage relay 9 and the DC insulation monitoring device are both electrically connected to the measurement and control device. A plurality of DC load switches electrically connected to the DC bus are arranged inside the DC load transfer cabinet 2 .

Specifically, the bottoms of the AC load transfer cabinet 1 and the DC load transfer cabinet 2 are equipped with brake wheels 12, the AC load transfer cabinet 1 and the DC load transfer cabinet 2 are equipped with front and rear doors, and the AC load switch and DC load switches are arranged in multiple layers, the lower part of the DC load transfer cabinet is provided with a partition, the battery pack 11 is placed under the partition, and the front of the AC load transfer cabinet and the DC load transfer cabinet are equipped with locks. handle6.

In the mobile AC-DC integrated power supply transformation load transfer device of the embodiment of the utility model, the AC and DC loads to be transferred are respectively connected to the AC load switch and the DC load switch, and the AC load transfer cabinet is equipped with two AC air switches, respectively connected to the To the low-voltage side of the two substations, one works normally and the other is standby. The voltage condition of the AC bus is monitored by a voltmeter and a low-voltage relay. The DC load transfer cabinet is equipped with two DC air switches, which are respectively connected to the mobile charger DC At the output end and both ends of the battery pack, the DC insulation monitoring device with anti-AC intrusion and the low-voltage relay monitor the DC bus voltage, the insulation status of the DC power supply and the fault of the AC component of the DC system. When the above-mentioned AC and DC faults occur, The alarm signal is uploaded to the measurement and control device for monitoring.

In the process of transforming AC and DC integrated power supplies in substations, this device improves the safety and reliability of temporary AC and DC power supply through the design of cabinet enclosure, dual power supply design, alarm function, and wide applicability. Simultaneous transfer of DC load greatly improves work efficiency.

The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present utility model. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (5)

1. A mobile AC-DC integrated power supply transformation load transfer device, characterized in that: it includes an AC load transfer cabinet and a DC load transfer cabinet, a three-phase bus is arranged in the AC load transfer cabinet, and the three-phase bus is connected to two A station transformer, an AC air switch is set between the three-phase busbar and the station transformer, a dual power supply automatic switch is connected between the two AC air switches, and the front shell of the AC load transfer cabinet is set to a voltage A meter, a changeover switch, and three low-voltage relays. The voltmeter and the changeover switch are connected in series and connected to the three-phase busbar. The low-voltage relay, fuse, and AC alarm terminal block are connected in parallel and connected to the three-phase busbar. Phase busbar, the AC alarm terminal row is electrically connected to a measurement and control device, and a plurality of AC load switches electrically connected to the three-phase busbar are arranged inside the AC load transfer cabinet; A DC bus bar is arranged on the top of the DC load transfer cabinet, and the DC bus bar is connected to two DC air switches, the first DC air switch is connected to the DC output end of the mobile charger, and the second DC air switch is connected to the battery pack. The AC input terminal of the mobile charger is electrically connected to one of the AC load switches, and the front shell of the DC load transfer cabinet is provided with a voltmeter and a DC low-voltage relay, and the voltmeter and the DC low-voltage relay are all connected to the The DC bus is electrically connected, the DC bus is electrically connected to a DC insulation monitoring device, the DC low voltage relay and the DC insulation monitoring device are both electrically connected to the measurement and control device, and the DC load transfer cabinet is internally equipped with multiple The DC load switch is electrically connected to the DC bus. 2. The mobile AC-DC integrated power supply transformation load transfer device as claimed in claim 1, characterized in that: the bottoms of the AC load transfer cabinet and the DC load transfer cabinet are equipped with brake wheels, and the AC load transfer cabinet Both the transfer cabinet and the DC load transfer cabinet are equipped with front and rear doors. 3. The mobile AC-DC integrated power supply transformation load transfer device according to claim 2, characterized in that: the AC load switch and the DC load switch are arranged in multiple layers. 4. The mobile AC-DC integrated power supply transformation load transfer device according to claim 3, characterized in that: a partition is arranged at the lower part of the DC load transfer cabinet, and the battery pack is placed under the partition. 5. The mobile AC-DC integrated power supply transformation load transfer device according to claim 1 or 4, characterized in that: the fronts of the AC load transfer cabinet and the DC load transfer cabinet are provided with lockable handles.