CN104467157B - Multi-voltage-class standby direct-current operating power source - Google Patents

Abstract

The invention relates to a multi-voltage level standby DC operating power supply, which includes an inverter, a storage battery, and several transformation modules; the input end of the storage battery is connected to the output end of the inverter, and the voltage transformation modules are respectively connected in parallel to the output ends of the storage battery. Form a number of backup power supply lines; when the input voltage is normal, the input voltage supplies power to the outside world, and at the same time, the battery is charged after being rectified and transformed by the inverter; when the input voltage is abnormal, the output voltage of the battery is transformed into After matching the output voltage of the voltage module, supply power to the outside world. The multi-voltage level standby DC operating power supply of the present invention is provided with multiple transformer modules, which can be used for DC operating systems requiring various voltage levels, such as providing 48V DC operating power for ring network cabinets and 220V for switching stations DC operating power supply, etc.

Description

A kind of multi-voltage level standby DC operating power supply

technical field

The invention relates to a backup DC operating power supply for a DC screen of a switching station, more specifically, to a multi-voltage level backup DC operating power supply.

Background technique

With the development of the urban distribution network, the switching station based on the 10kV ring main unit is playing an increasingly important role in the urban distribution network due to its convenience and high efficiency. The reliability of distribution network directly affects the development of urban construction. The higher the requirement for power supply reliability, the higher the requirement for configuring a DC operating power supply.

However, switching stations, ring network cabinets, etc. are mostly located outdoors or remote places, even in basements. Its working environment is harsh and networking is difficult, which directly increases the requirements for maintenance. The power supply methods of DC operating power supply in switchgear, ring main unit and other occasions mainly include backup battery power supply, PT power supply or AC mains power supply.

The reliability of the battery is extremely important as the guarantee of the uninterrupted power supply of the DC operating power supply after the AC power failure. Most of the existing DC operating power supplies are DC screens, which are large in size and equipped with a large number of batteries, which cause great inconvenience to installation, commissioning and maintenance, and the reliability of the power supply system cannot be guaranteed.

Moreover, the battery life on the market is generally not high and needs to be replaced frequently. Once the battery fails at the same time, the entire switchgear will lose the DC operating power supply, seriously endangering the stable operation of the power grid. The power supply methods of the ring main unit mainly include backup battery power supply and PT power supply. Similarly, battery failures are often found during routine maintenance. Once the incoming power supply of the ring main unit fails, the ring main unit will lose its DC operating power.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an efficient, highly reliable multi-voltage level backup DC operating power supply that can temporarily replace the existing distribution network DC power supply equipment.

Technical scheme of the present invention is as follows:

A multi-voltage level standby DC operating power supply, including an inverter, a battery, and several transformer modules; the input end of the battery is connected to the output end of the inverter, and the transformer modules are respectively connected in parallel to the output end of the battery to form several backup Power supply line; when the input voltage is normal, the input voltage supplies power to the outside world, and at the same time, the battery is charged after being rectified and transformed by the inverter; when the input voltage is abnormal, the output voltage of the battery is transformed by the transformer module to match the transformer module After the output voltage is reached, supply power to the outside world.

Preferably, when the output voltage of the backup DC operating power supply is required to be the same as the output voltage of the storage battery, the backup power supply line does not need to be equipped with a transformer module to form a backup direct supply line, and the output voltage of the storage battery is directly used for external power supply.

Preferably, the connection line between the inverter and the storage battery is provided with a charging connection switch. When the input voltage is normal, the charging connection switch is closed; when the input voltage is abnormal, the charging connection switch is disconnected.

Preferably, the connection line between the storage battery and each transformer module is provided with an output switch, and when the input voltage is normal, the output switch is turned off; when the input voltage is abnormal, the output switch is turned on.

Preferably, a power supply switch is provided at the output end of each transformer module, and when the input voltage is normal, the power supply switch is turned off; when the input voltage is abnormal, the power supply switch is turned on.

Preferably, the charging connection switch, all output switches, and all power supply switches are controlled on and off by the universal switch.

Preferably, when the input voltage is normal, the charging connection switch is closed, and all output switches and all power supply switches are disconnected; when the input voltage is abnormal, the charging connection switch is disconnected, and at least one output switch connected to the transformer module is closed with the power supply switch, The output switches connected to the remaining transformer modules are disconnected from the power supply switches.

Preferably, the charging module in the storage battery is provided with a charging switch. When the input voltage is normal, the charging connection switch is closed, and the charging switch is closed; when the input voltage is abnormal, the charging connection switch is disconnected, and the charging switch is disconnected.

Preferably, the charging connection switch is connected before all backup power supply lines and after the output terminal of the inverter.

Preferably, when the backup direct supply line is connected to the output end of the inverter, the charging connection switch is connected in parallel with an isolating switch. When the input voltage is normal, the isolating switch is turned off;

The beneficial effects of the present invention are as follows:

The multi-voltage level standby DC operating power supply of the present invention is equipped with multiple transformer modules, which can be used for DC operating systems requiring various voltage levels, such as providing 48V DC operating power for ring network cabinets and 220V for switching stations. DC operating power supply, etc.

The invention can replace the DC operating power supply of the switching station and the ring network cabinet, and temporarily provide temporary power for the intelligent distribution network terminal, intelligent equipment, microcomputer protection, vacuum circuit breaker energy storage, etc. of the ring network cabinet, switching station and other places . Moreover, the present invention can run multiple machines in parallel, temporarily replacing the DC screen power supply of the switching station.

Description of drawings

Fig. 1 is a schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the arrangement of the charging connection switch, the disconnecting switch and the power supply switch of the present invention;

Figure 3 is a switch state table of the universal transfer switch.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

In order to be applicable to a variety of different voltages required by switching stations and ring network cabinets, meet the needs of different loads, and improve the utilization rate of power sources, the present invention provides a multi-voltage level standby DC operating power supply, including inverters, batteries, Several transformer modules; the input terminal of the storage battery is connected to the output terminal of the inverter, and the transformer modules are respectively connected in parallel to the output terminal of the storage battery to form several backup power supply lines. When the output voltage of the backup DC operating power supply is required to be the same as the output voltage of the battery, the backup power supply line does not need to be equipped with a transformer module to form a backup direct supply line, which is directly powered by the output voltage of the battery.

When the input voltage is normal, the input voltage supplies power to the outside, and at the same time, it is rectified and transformed by the inverter to charge the battery; when the input voltage is abnormal, the output voltage of the battery is transformed by the transformer module into an output voltage that matches the transformer module After that, supply power to the outside world.

In order to ensure that the present invention is more stable and safe, the connection line between the inverter and the storage battery is provided with a charging connection switch, and the charging module in the storage battery is provided with a charging switch. When the input voltage is normal, the charging connection switch is closed, and the charging switch is closed. The battery is charged; when the input voltage is abnormal, such as the input voltage loses power, the charging connection switch is disconnected, the charging switch is disconnected, the input voltage cannot supply external power, and the charging of the battery is stopped at the same time, and the external power supply is switched to the battery.

The connection line between the storage battery and each transformer module is provided with an output switch, and the output end of each transformer module is provided with a power supply switch. When the input voltage is normal, the output switch is turned off, and the power supply switch is turned off; when the input voltage is abnormal, The output switch is closed and the power supply switch is closed.

Since the present invention provides multi-level voltage output, when one or several backup power supply lines are required to supply power to the outside, it is necessary to close or disconnect the charging connection switch, multiple output switches, and multiple power supply switches, and there are many procedures. If If fast switching cannot be performed, the reliability of the power system will be greatly reduced. Therefore, in the present invention, the charging connection switch, all output switches, and all power supply switches are controlled on and off by the universal switch. Under the control of the universal transfer switch, when the input voltage is normal, the charging connection switch is closed, and all output switches and all power supply switches are disconnected; when the input voltage is abnormal, the charging connection switch is disconnected, and at least one output switch connected to the transformer module The power supply switch is closed, and the output switches connected to the other transformer modules are disconnected from the power supply switch.

In order to simplify the circuit design, when the output voltage of the backup DC operating power supply is the same as the output voltage of the battery, the backup direct supply line is connected to the output terminal of the inverter. In this connection mode, in order to avoid the reliability defects of the inverter itself, the charging connection switch is connected in parallel with an isolating switch. When the input voltage is normal, the isolating switch is turned off; when a spare direct line is required for external power supply, the isolating switch is closed.

The charging connection switch is connected before all the backup power supply lines and after the output terminal of the inverter, so as to ensure that the disconnection of the charging connection switch will prevent the normal operation of any backup power supply line.

As shown in Figure 1 and Figure 2, in this embodiment, the input voltage is 220V AC voltage, the inverter is an AC220V/DC12V converter, and the battery includes two sets of 14Ah/12V rechargeable batteries connected in series. This embodiment requires a backup power supply line The output voltages are 24V output voltage, 48V output voltage, 110V output voltage, and 220V output voltage, so the transformer module includes a 48V boost module, a 110V boost module, and a 220V boost module.

The electrical connection is specifically: a safety tube is set between the positive pole of the AC voltage of the input voltage and the positive pole of the input terminal of the inverter, the positive and negative poles of the output terminal of the inverter are respectively connected to the positive and negative poles of the battery, and the backup of the 24V output voltage The positive and negative poles of the power supply line are also connected to the positive and negative poles of the output terminal of the inverter, and the positive and negative poles of the 48V boost module, 110V boost module, and 220V boost module are respectively connected to the positive and negative poles of the battery. The lines are connected in parallel. A charging connection switch and an isolating switch are arranged in parallel on the positive electrode of the output end of the inverter, and a charging switch is arranged behind the charging connection switch and in front of the positive and negative electrodes of the storage battery.

The output switch of each backup power supply line is set at the positive pole, and an indicator light is connected in parallel between the positive and negative poles of the input end of each backup power supply line. In the 48V standby power supply line, 110V standby power supply line, and 220V standby power supply line, the indicator light can be connected in parallel to the input or output of the transformer module. A power supply switch is arranged on the positive and negative poles of the output end of each standby power supply line.

As shown in Figure 3, the universal transfer switch in this embodiment is provided with six gears, each switch has two contacts, and only one backup power supply line is provided for external power supply.

When the universal transfer switch is at gear 0, all switches are disconnected, and the backup DC operating power supply is turned off;

When the universal transfer switch is in gear 1, the output switch of the 24V standby power supply line is closed, the power supply switch of the positive and negative poles A1 and A2 of the output terminal is closed, the isolation switch is closed, other switches are opened, and the standby DC operating power supply provides 24V output voltage;

When the universal transfer switch is at the second gear, the output switch of the 48V standby power supply circuit is closed, the power supply switches of the positive and negative poles B1 and B2 of the output terminal are closed, and the other switches are opened, and the standby DC operating power supply provides 48V output voltage;

When the universal transfer switch is in gear 3, the output switch of the 110V standby power supply circuit is closed, the power supply switches of the positive and negative poles C1 and C2 of the output terminal are closed, other switches are opened, and the standby DC operating power supply provides 110V output voltage;

When the universal transfer switch is in gear 4, the output switch of the 220V standby power supply line is closed, the power supply switches of the positive and negative poles D1 and D2 of the output terminals are closed, and the other switches are opened, and the standby DC operating power supply provides 220V output voltage;

When the universal transfer switch is at gear 5, the charging connection switch is closed, the charging switches BET+ and BET- are closed, other switches are opened, and the input voltage is used to charge the battery.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as it is based on the technical spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims (6)

1. the standby direct current operative power source of a kind of multi-voltage grade, it is characterised in that including inverter, accumulator, several transformations Module；The input of accumulator is connected with the outfan of inverter, and voltage changing module is connected in parallel on respectively the outfan of accumulator, is formed Some stand-by power supply circuits；When input voltage is normal, input voltage supplying power for outside, while Jing after inverter rectifier transformer, it is right Accumulator is charged；When input voltage is abnormal, the output voltage Jing voltage changing modules of accumulator are transformed into and voltage changing module After the output voltage matched somebody with somebody, supplying power for outside；

Connection line between inverter and accumulator is provided with charging connection switch, when input voltage is normal, charging connection Switch closure；When input voltage is abnormal, charging connection is switched off；

Connection line between accumulator and each voltage changing module is provided with output switch, and when input voltage is normal, output is opened Shut-off is opened；When input voltage is abnormal, output switch closure；

The outfan of each voltage changing module is provided with power switch, and when input voltage is normal, power switch disconnects；When input electricity When reduce off-flavor is normal, power switch closure；

Charging connection switch, all output switchs, all power switch are by universal seclector control closure and disconnection.

2. the standby direct current operative power source of multi-voltage grade according to claim 1, it is characterised in that when needing standby direct current When the output voltage of operation power supplying power for outside is identical with the output voltage of accumulator, the road stand-by power supply circuit need not be arranged Voltage changing module, forms standby direct-furnish circuit, directly carries out supplying power for outside by the output voltage of accumulator.

3. the standby direct current operative power source of multi-voltage grade according to claim 1 and 2, it is characterised in that work as input voltage When normal, charging connection switch closure, all output switchs, all power switch disconnect；When input voltage is abnormal, charges and connect Connect and switch off, output switch and the power switch of the connection of at least one voltage changing module are closed, and it is defeated that remaining voltage changing module connects Go out switch to disconnect with power switch.

4. the standby direct current operative power source of multi-voltage grade according to claim 1 and 2, it is characterised in that in accumulator Charging module is provided with charge switch, when input voltage is normal, charging connection switch closure, and charge switch closure；Work as input During electric voltage exception, charging connection is switched off, and charge switch disconnects.

5. the standby direct current operative power source of multi-voltage grade according to claim 1 and 2, it is characterised in that charging connection is opened Connection be connected on before all stand-by power supply circuits, after the outfan of inverter.

6. the standby direct current operative power source of multi-voltage grade according to claim 2, it is characterised in that when standby direct-furnish circuit When being connected to the outfan of inverter, charging connection switch in parallel has cutoff switch, and when input voltage is normal, cutoff switch is broken Open；When standby direct circuit supplying power for outside is needed, cutoff switch closure.