CN203406685U - A remote control device for a DC system - Google Patents

Abstract

The utility model provides a remote control device of a direct current system. The device mainly comprises a processor, multiple relays connected with the processor and multiple contactors in one-to-one correspondence connection with the multiple relays, wherein two leading wire ends of a normally-closed contact switch of a first contactor of the multiple contactors are respectively connected with an alternating current power source and a load, two leading wire ends of a normally-closed contact switch of a second contactor of the multiple contactors are respectively connected with the alternating current power source and a storage battery, and two leading wire ends of a normally-opened contact switch of a third contactor are respectively connected with the storage battery. A corresponding relay is controlled to open or close by the processor according to operation instructions, the normally-closed contact switch or the normally-closed contact switch of one contactor connected with the corresponding relay is opened or closed, so automatic control on the direct current system is realized in a remote mode, work efficiency is improved.

Description

A remote control device for a DC system

technical field

The utility model relates to the field of power systems, in particular to a remote control device for a direct current system.

Background technique

The DC system is an independent power source, widely used in various power plants and substations, and is the power guarantee for various power plants and substations. When the AC power supply is interrupted, the storage battery of the DC system can continue to supply power to the outside as a backup power supply.

According to the actual situation on site, multiple sets of DC systems can be set up, and each DC system includes: AC power supply, load and storage battery. The structure of the DC system is introduced below by taking two sets of DC systems as examples.

Referring to Fig. 1, an electrical wiring diagram of a DC system is shown. The DC system includes: an AC power source 1, a load 1 connected to the AC power source 1 through a switch Q11, a battery 1 connected to the AC power source 1 through a switch Q12, a switch Q13 connected to the battery 1, an AC power source 2, and a load 1 connected to the AC power source 1 through a switch Q12. The load 2 connected to the AC power source 2 , the storage battery 2 connected to the AC power supply 2 through the switch Q22 , the switch Q23 connected to the storage battery 2 , and the switch Q3 connected between the load 1 and the load 2 . Under normal circumstances, Q11, Q12, Q13, Q21, Q22, Q23, and Q3 are all manually controlled. By controlling the opening or closing of the above switches, the power supply of the DC system to the load 1 and the load 2 is controlled, as well as to the battery 1 and the battery. 2. Checking discharge test. Due to the manual control mode, the operator needs to be supervised on site, so the efficiency is low.

Utility model content

In view of this, the utility model provides a remote control device of a DC system to improve work efficiency.

In order to achieve the above object, the utility model provides the following technical solutions:

A remote control device for a DC system, the DC system includes an AC power supply, a load and a battery, and the device includes: a processor that outputs an open control signal or a close control signal according to an operation instruction;

a plurality of relays connected to the processor, the relays are opened according to the opening control signal or closed according to the closing control instruction;

A first contactor provided with a normally closed contact switch, wherein the two lead ends of the normally closed contact switch of the first contactor are respectively connected to the AC power supply and the load;

A second contactor provided with a normally closed contact switch, wherein the two lead terminals of the normally closed contact switch of the second contactor are respectively connected to the AC power supply and the storage battery;

A third contactor provided with a normally open contact switch, wherein the two lead ends of the normally open contact switch of the third contactor are respectively connected to the storage battery;

The first contactor, the second contactor and the third contactor are connected to a plurality of the relays in one-to-one correspondence.

Preferably, the device also includes:

A fourth contactor provided with a normally open contact switch, wherein the two lead ends of the normally open contact switch of the fourth contactor are respectively connected to the two loads of the two DC systems;

The first contactor, the second contactor, the third contactor and the fourth contactor are respectively connected to a plurality of the relays in a one-to-one correspondence.

Preferably, the device further includes: a diode connected in parallel with the normally closed contact switch of the second contactor;

The anode of the diode is connected to the storage battery;

The cathode of the diode is connected to the AC power source of the DC system.

Preferably, the processor adopts a Megal128 single-chip microcomputer.

Compared with the prior art, the utility model provides a remote control device for a DC system, which mainly includes: a processor, a plurality of relays connected to the processor, and a plurality of contactors connected one by one to the relays . Wherein, the two lead ends of the normally closed contact switch of the first contactor among the plurality of contactors are respectively connected to the AC power supply and the load; the two lead ends of the normally closed contact switch of the second contactor are respectively connected to the AC power supply It is connected with the storage battery; the two lead terminals of the normally open contact switch of the third contactor are respectively connected with the storage battery. The processor opens or closes the corresponding relay of the controller according to the operation instruction, and then the normally open contact switch or normally closed contact switch of the contactor connected to the relay is opened or closed, so that the control of the DC system can be realized remotely. Automatic control improves work efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Figure 1 shows an electrical wiring diagram of a DC system;

Fig. 2 shows a schematic structural view of an embodiment of a remote control device for a DC system of the present invention;

Fig. 3 shows a schematic structural diagram of another embodiment of a remote control device for a DC system of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to FIG. 1 , it shows a schematic structural diagram of an embodiment of a remote control device for a DC system of the present invention.

A DC system generally includes: an AC power source 1 , a storage battery 2 and a load 3 . Under normal circumstances, the AC power source 1 load 3 supplies power and charges the storage battery 2 . When the AC power supply 1 is cut off, the storage battery 5 continues to provide electric energy to the load 3 as a backup power supply.

In this embodiment, the remote control device of the DC system includes: a processor 4 , a plurality of relays 5 connected to the processor 4 , and a plurality of contactors connected to the plurality of relays 2 in one-to-one correspondence.

In order to distinguish the plurality of contactors, the plurality of contactors are respectively referred to as the first contactor 6 , the second contactor 7 and the third contactor 8 .

Wherein, the two lead ends of the normally closed contact switch of the first contactor 6 are respectively connected to the AC power source 1 and the load 3 of the DC system. When the normally closed contact switch of the first contactor 7 is in a closed state, the AC power source 1 supplies power to the load 3 .

The two lead terminals of the normally closed contact switch of the second contactor 7 are respectively connected with the AC power source 1 and the storage battery 2 . When the normally closed contact switch of the second contactor 7 is in the closed state, the AC power source 1 charges the storage battery 2 , and when the AC power source 1 is powered off, the storage battery 2 can provide electric energy to the load 1 .

The two lead terminals of the normally open contact switch of the third contactor 8 are respectively connected with the storage battery 2 . When the discharge test is performed on the storage battery, the normally closed contact switch of the third contactor is controlled to be in a closed state, and the discharge detection of the storage battery is completed. It should be noted that, in order to ensure the safety of the battery discharge detection process, a resistor (not shown in the figure) with a certain resistance value is usually set between the battery 2 and the normally open contact switch of the third contactor 8 to prevent the battery from There is a short circuit condition.

The processor controls the DC system as follows:

The processor opens or closes the corresponding relay of the controller according to the operation command, and then the contact switch (normally closed contact switch or normally closed contact switch) of the contactor connected to the relay is opened or closed, so that it can be connected remotely The automatic control of the DC system is realized, and the working efficiency is improved. For example: when detecting the discharge of the storage battery, the processor controls the relay connected to the second contactor and the relay connected to the third contactor to close, and at this time the second contactor and the third contactor are energized. The normally closed contact switch of the second contactor is opened, the normally open contact switch of the third contactor is closed, and the positive and negative poles of the battery form a path through the normally open contact switch of the third contactor, thereby completing the discharge detection of the battery .

It should be noted that in practical applications, power plants and substations usually include multiple sets of DC systems, and multiple sets of DC systems are connected through switches (see Figure 1).

Further, in practical applications, in order to save costs, the multiple relays and the multiple contactors may use multiple relays and multiple contactors, for example: nine relays and nine contactors.

In order to realize the control of multiple sets of direct current systems, the utility model also discloses a structural schematic diagram of another embodiment of a remote control device for direct current systems. Different from the previous embodiment, in this embodiment, the device also includes:

A fourth contactor with a normally open contact switch is provided, wherein the two lead ends of the normally open contact switch of the fourth contactor are respectively connected to the two loads of the two DC systems.

There are usually two ways to discharge the battery: dynamic discharge and static discharge. The discharge time of dynamic discharge and static discharge is different. Corresponding to dynamic discharge, the discharge time of static discharge is longer. In order to protect the safety of the system, when the battery is statically discharged, the normally open contact switch of the fourth contactor is usually closed first, and then disconnected when the static discharge is completed. Normally closed contact switch for four contactors.

Referring to FIG. 3 , it shows a structural schematic diagram of another embodiment of a remote control device for a DC system of the present invention.

The difference from the previous embodiment is that the AC power supply may be cut off during the discharge process of the storage battery. Therefore, in order to ensure the normal operation of the external power supply of the system, in this embodiment, the device further includes: a diode 9 connected in parallel with the normally closed switch contact switch of the second contactor. Wherein, the anode of the diode 9 is connected with the storage battery, and the cathode of the diode 9 is connected with the AC power source of the DC system.

When the AC power supply stops supplying power to the outside during the discharge process of the storage battery, the storage battery can provide electric energy to the load through the diode 9 pair.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. 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 invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. a remote control for direct current system, described direct current system comprises AC power, load and storage battery, it is characterized in that, described device comprises: according to operational order, output disconnects the processor of control signal or Closed control signal;

A plurality of relays that are connected with described processor, described relay disconnects according to described disconnection control signal or is closed according to described Closed control instruction;

Be provided with the first contactor of normally-closed contact switch, wherein, two lead ends of the normally-closed contact switch of described the first contactor are connected with described load with described AC power respectively;

Be provided with the second contactor of normally-closed contact switch, wherein, two lead ends of the normally-closed contact switch of described the second contactor are connected with described storage battery with described AC power respectively;

Be provided with the 3rd contactor of normally opened contact switch, wherein, two lead ends of the normally opened contact switch of described the 3rd contactor are connected with described storage battery respectively;

Described the first contactor, described the second contactor and described the 3rd contactor and a plurality of described relays are corresponding being connected one by one.

2. device according to claim 1, is characterized in that, described device also comprises:

Be provided with the 4th contactor of normally opened contact switch, wherein, two lead ends of the normally opened contact switch of described the 4th contactor are connected with two loads of two described direct current systems respectively;

Described the first contactor, described the second contactor, described the 3rd contactor and described the 4th contactor respectively with a plurality of described relays corresponding being connected one by one.

3. device according to claim 1, is characterized in that, described device also comprises: with the diode of the normally-closed contact switch in parallel of described the second contactor;

The anode of described diode is connected with described storage battery;

The negative electrode of described diode is connected with the AC power of described direct current system.

4. device according to claim 1, is characterized in that, described processor adopting Megal128 single-chip microcomputer.

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