CN219625590U

CN219625590U - Current overload warning system

Info

Publication number: CN219625590U
Application number: CN202320391048.4U
Authority: CN
Inventors: 官枫; 王玉明; 孙洪伟; 宋培云; 周磊; 李琨; 王倩; 冷潇倩; 徐丽洁; 李鑫; 王晓燕
Original assignee: Pingdu Power Supply Company Shandong Electric Power Company Sgcc
Current assignee: Pingdu Power Supply Company Shandong Electric Power Company Sgcc
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-09-01
Anticipated expiration: 2033-03-06

Abstract

The utility model relates to a current overload warning system, comprising: and the DC end of the switching power supply is electrically connected with a controller, a transmitter, a network switch and a display screen. And (3) a controller: the DI port and the DO port are respectively and electrically connected with a relay group, and the relay group is electrically connected with an alarm; the AI port is electrically connected with an AO terminal of the transmitter; the TCP/IP port is communicatively coupled to the network switch. And a current transformer is electrically connected to the AI port of the transmitter. The network switch is in communication with the display screen. According to the current overload warning system, whether the electricity utilization side is overloaded or not is monitored in real time; and the device is also used in a capacity power system, so that the device is convenient to look up.

Description

Current overload warning system

Technical Field

The utility model relates to the technical field of electrical control, in particular to a current overload warning system.

Background

In the power system, when the power system fails to work according to the index, a fault occurs. That is, devices in the power grid, such as power generation devices (generators), power transformation devices (transformers), power transmission devices (transmission lines, power towers), etc., do not meet the expected "send-change-send" requirements. From the point of view of the occurrence of power system faults, common faults are: generator set faults, transmission line faults, substation faults, bus faults and the like. From the appearance of the power-side fault, the power fault is further divided into: an increase in current, i.e. in the electrical device connecting the short-circuit point with the power supply; voltage drop, namely, voltage on electrical equipment around a fault point is reduced, and the closer the electrical distance from the fault point is, the more serious the voltage drop is, even the voltage drop is zero; the phase difference between the line start voltage and the current will change; the ratio between the line start voltage and the current, i.e. the measured impedance, will change.

At present, the electric equipment is provided with a protection mechanism by itself, and the electric equipment is automatically tripped and powered off when overcurrent occurs, so that the electric equipment is protected. From the perspective of overall dispatching of the power system, the types, functions, power consumption and levels of all the electric equipment are different, and the electric equipment cannot be compatible with the power system.

Therefore, a system for monitoring the overcurrent state of the electric equipment is needed on the basis of ensuring the normal operation of the electric power system, and the system can monitor the current condition of the electric power system in real time and warn when the electric power system is overloaded.

Disclosure of Invention

In order to solve the technical problems in the background technology, the utility model provides a current overload warning system which monitors whether an overcurrent and overload condition occurs on the electricity utilization side in real time; and the device is also used in a capacity power system, so that the device is convenient to look up.

The utility model adopts the technical scheme that:

a current overload warning system, comprising:

and the DC end of the switching power supply is electrically connected with a controller, a transmitter, a network switch and a display screen.

The controller: the DI port and the DO port are respectively and electrically connected with a relay group, and the relay group is electrically connected with an alarm; the AI port is electrically connected with an AO terminal of the transmitter; the TCP/IP port is communicatively coupled to the network switch.

The transmitter: and the AI port is electrically connected with a current transformer.

The network switch: which is in communication with the display screen.

Further, the controller is configured as a programmable logic controller.

Further, the transmitter is set as a 'one-in two-out' current transmitter, and redundant port data are electrically connected with secondary protection equipment.

Further, the network switch is in communication connection with an upper computer in the central control room.

Further, the display screen is set as a touch screen and is used for setting an alarm threshold value, displaying alarm information/time and manually controlling.

Further, the relay group includes:

alarm relay KA1, stop relay KA2, closing relay KA3, overload relay KA4, and start relay KA5.

Further, the alarm relay KA1, the stop relay KA2, the closing relay KA3, the overload relay KA4 and the starting relay KA5 respectively form a loop with the DO port of the controller and the DC end of the switching power supply.

Further, the warning device comprises:

audible and visual alarm L0, warning light L1, warning light L2, warning light L3.

Further, a normally open contact of the alarm relay KA1, the audible and visual alarm L0 and a DC end of the switching power supply form a loop;

the normally closed contact of the stop relay KA2, the warning lamp L1 and the DC end of the switching power supply form a loop;

the normally open contact of the switching-on relay KA3, the warning lamp L2 and the DC end of the switching power supply form a loop;

and a normally open contact of the starting relay KA5, the warning lamp L3 and the DC end of the switching power supply form a loop.

Further, the normally open contact of the overload relay KA4 forms a loop with the DI port of the controller and the DC end of the switching power supply.

The current overload warning system has the advantages that:

1. collecting the current of electric equipment through a current transformer and a transmitter;

2. processing a current signal and an overload signal of the electric equipment through the controller;

3. and sending an alarm signal to each alarm part in the alarm through the controller.

Drawings

In order to more clearly illustrate the embodiments of the present utility model, the drawings required in the embodiments will be briefly described below, and the drawings in the following description are embodiments of the present utility model.

Fig. 1 is an electrical schematic diagram of a current overload warning system according to an embodiment of the present utility model.

In the figure:

11. a switching power supply 12, a controller 13, a transmitter 14 and a current transformer,

15. network switch, 16, display screen, 19, relay group, 20, attention device.

Detailed Description

In order to more clearly and clearly describe the specific implementation objects and embodiments of the present utility model, the following description will fully describe the technical solutions of the present utility model, and the described embodiments are some, but not all, embodiments of the present utility model. All other embodiments based on the described embodiments of the utility model fall within the scope of the utility model without making inventive efforts.

The utility model relates to a current overload warning system, as shown in figure 1, comprising:

the DC end of the switching power supply 11 is electrically connected with a controller 12, a transmitter 13, a network switch 15 and a display screen 16.

The controller 12 is configured as a programmable logic controller on which:

the DI port and the DO port are respectively and electrically connected with a relay group 19, and the relay group 19 is electrically connected with an alarm 20;

the AI port is electrically connected with the AO terminal of the transmitter 13;

the TCP/IP ports are communicatively connected to the network switch 15.

The transmitter 13 is configured as a "one-in two-out" current transmitter, and the redundant port data is electrically connected with the secondary protection device, on which: a current transformer 14 is provided in electrical connection with the AI port.

The network switch 15 is in communication connection with an upper computer in the central control room, and is in communication connection with the display screen 16.

The display 16 is configured as a touch screen for setting alarm thresholds, displaying alarm information/time, manual control.

The relay group 19 includes:

alarm relay KA1, stop relay KA2, closing relay KA3, overload relay KA4, and start relay KA5. The alarm relay KA1, the stop relay KA2, the closing relay KA3, the overload relay KA4 and the starting relay KA5 respectively form a loop with the DO port of the controller 12 and the DC end of the switching power supply 11.

The warning device 20 includes:

audible and visual alarm L0, warning light L1, warning light L2, warning light L3. The normally open contact of the alarm relay KA1, the audible and visual alarm L0 and the DC end of the switching power supply 11 form a loop; the normally closed contact of the stop relay KA2, the warning lamp L1 and the DC end of the switching power supply 11 form a loop; the normally open contact of the switching-on relay KA3, the warning lamp L2 and the DC end of the switching power supply 11 form a loop; the normally open contact of the starting relay KA5 forms a loop with the warning lamp L3 and the DC end of the switching power supply 11. The normally open contact of the load relay KA4 forms a loop with the DI port of the controller 12 and the DC terminal of the switching power supply 11.

Based on the above, the embodiment of the current overload warning system according to the present utility model is taught, and by the above description, related workers can make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. A current overload warning system, characterized in that:

comprising the following steps:

a switch power supply (11) electrically connected with the mains supply, a controller (12), a transmitter (13), a network switch (15) and a display screen (16) are electrically connected with the DC end of the switch power supply (11),

the controller (12):

the DI port and the DO port are respectively and electrically connected with a relay group (19), the relay group (19) is electrically connected with an alarm (20),

the AI port is electrically connected with the AO terminal of the transmitter (13),

the TCP/IP port is in communication connection with the network switch (15);

the transmitter (13):

a current transformer (14) is arranged on the AI port in an electrical connection manner;

-said network switch (15):

which is in communication with a display screen (16).

2. The current overload warning system of claim 1, wherein:

the controller (12) is configured as a programmable logic controller.

3. The current overload warning system of claim 1, wherein:

the transmitter (13) is set as a 'one-in two-out' current transmitter, and redundant port data are electrically connected with secondary protection equipment.

4. The current overload warning system of claim 1, wherein:

the network switch (15) is in communication connection with an upper computer in the central control room.

5. The current overload warning system of claim 1, wherein:

the display screen (16) is arranged as a touch screen and is used for setting an alarm threshold value, displaying alarm information/time and manually controlling.

6. A current overload warning system in accordance with claim 2 wherein:

the relay group (19) includes:

7. The current overload warning system of claim 6, wherein:

the alarm relay KA1, the stop relay KA2, the closing relay KA3, the overload relay KA4 and the starting relay KA5 respectively form a loop with a DO port of the controller (12) and a DC end of the switching power supply (11).

8. The current overload warning system of claim 7, wherein:

the warning device (20) comprises:

9. The current overload warning system of claim 8, wherein:

the normally open contact of the alarm relay KA1, the audible and visual alarm L0 and the DC end of the switching power supply (11) form a loop;

the normally closed contact of the stop relay KA2, the warning lamp L1 and the DC end of the switching power supply (11) form a loop;

the normally open contact of the switching-on relay KA3, the warning lamp L2 and the DC end of the switching power supply (11) form a loop;

and a normally open contact of the starting relay KA5, the warning lamp L3 and the DC end of the switching power supply (11) form a loop.

10. The current overload warning system of claim 9, wherein:

the normally open contact of the overload relay KA4 forms a loop with the DI port of the controller (12) and the DC end of the switching power supply (11).