CN211790723U - Intelligent protection device of fixed circuit breaker switch cabinet - Google Patents

Abstract

The utility model discloses an intelligent protection device of a fixed breaker switch cabinet, which is arranged in the fixed breaker switch cabinet, the intelligent protection circuit comprises an intelligent protection unit, a display control unit, an intelligent protection unit comprises a shell and a circuit board, the circuit board comprises a central processing unit, a current-voltage transformer group, an input signal filter circuit, an analog-to-digital conversion input A/D circuit, a multi-stage opening and closing relay protection circuit and an external communication module, the current-voltage transformer group is connected with the input signal filter circuit, the input signal filter circuit is connected with the analog-to-digital conversion input A/D circuit, the analog-to-digital conversion input A/D circuit is connected with the central processing unit, an I/O input output port of the central processing unit is connected with an input end of the multi-stage opening and closing relay protection circuit, and the opening and closing switch action of the multi-stage opening. The utility model discloses be applied to fixed circuit breaker cubical switchboard, have simple structure, simple to operate, anti strong electromagnetic interference, reliable strong, characteristics such as with low costs, error rate are low.

Description

Intelligent protection device of fixed circuit breaker switch cabinet

[ technical field ] A method for producing a semiconductor device

The utility model relates to a power equipment technical field, it is specific, relate to an intelligent protection device of fixed circuit breaker cubical switchboard.

[ background of the invention ]

At present, a switch cabinet is mainly used for opening and closing, controlling and protecting electric equipment in the process of generating, transmitting, distributing and converting electric energy of an electric power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. For the majority of power supply enterprises, the production quality and faults of the high-voltage switch cabinet directly relate to the stability of the power system of the enterprise, the continuity of production and the reliability of power supply in the enterprise, and the power supply safety of the whole power system.

The circuit breaker and the current transformer are arranged in the switch cabinet, the microcomputer protection device, the accessories and the electric meter are arranged on a panel of the relay chamber, and the microcomputer protection device, the operating handle, the protection outlet pressing plate and the indicating lamp (an on-position red lamp, an off-position green lamp and an energy storage completion yellow lamp) are specifically arranged; in the relay chamber, terminal strips, a microcomputer protection control circuit direct current power switch, a microcomputer protection working direct current power supply, an energy storage motor working power switch (direct current or alternating current) terminal strip and various power supply air switches are arranged in the relay chamber, and the terminal strips are connected with a circuit breaker mechanism through a control cable or a special socket.

The most common circuit breaker for mid-shelf cabinets is the VS1 vacuum circuit breaker, with the wiring within the circuit breaker mechanism coupled to the terminal block of the relay compartment through a dedicated socket. One section of the plug is fixedly connected with the breaker mechanism, and the other section of the plug is a special socket which is connected to the terminal strip of the relay chamber from a socket outgoing line.

Fixed circuit breaker structural feature: the circuit breaker body consists of a contact system, an arc extinguishing system, an operating mechanism, a current transformer, an intelligent controller, an auxiliary switch, a secondary plug connector, an undervoltage and shunt release part; the internal circuit (such as circuits of closing, opening, energy storage, limit switch and the like) of the vacuum circuit breaker is connected with the control circuit on the control cabinet through the socket, and the control circuit on the control cabinet is fixed. In a traditional switch cabinet provided with a fixed circuit breaker, signals such as current, voltage and the like are led out from the secondary side of a transformer and are connected to an intelligent protection terminal of an instrument room, and the CT analog quantity to be connected is A, B, C phase current. (some projects access A, C two-phase, incomplete star method) microcomputer protection devices can also display primary electric quantity, and the electric quantity is taken from a protection level. If special requirements are made on the accuracy. The measurement stage can be taken to be connected with the ammeter in series.

Simultaneously, the relevant state quantity of circuit breaker also need introduce to intelligent protection device, and the control line of intelligent protection draws also to circuit breaker electrical control return circuit, and work load is very big and connect the mistake easily, and it is higher to wiring personnel specialty and knowledge picture ability requirement, often will pull a lot of efforts when the field debugging and check the line to the point.

[ Utility model ] content

The utility model discloses a main aim at provides an intelligent protection device of fixed circuit breaker cubical switchboard with characteristics such as simple structure, simple to operate, anti strong electromagnetic interference, reliable strong, with low costs, the error rate is low.

In order to realize foretell main objective, the utility model provides a pair of intelligent protection device of fixed circuit breaker cubical switchboard sets up in fixed circuit breaker cubical switchboard, the device includes: the intelligent protection device comprises an intelligent protection unit arranged in a fixed circuit breaker and a display control unit arranged in a switch cabinet instrument room, wherein the intelligent protection unit is connected with an electrical control loop of the fixed circuit breaker, and a control line of the display control unit is connected with the intelligent protection unit through an aviation plug; the intelligent protection unit comprises a shell and a circuit board arranged in the shell, wherein the circuit board comprises a central processing unit, a current-voltage mutual inductor group, an input signal filter circuit, an analog-digital conversion input A/D circuit, a multistage opening and closing relay protection circuit and an external communication module connected with the central processing unit, a secondary line terminal of the current-voltage mutual inductor group is connected with a wiring terminal of the fixed circuit breaker, the current-voltage mutual inductor group is connected with the input signal filter circuit, the input signal filter circuit is connected with the analog-digital conversion input A/D circuit, the analog-digital conversion input A/D circuit is connected with the central processing unit, an I/O input output port of the central processing unit is connected with an input end of the multistage opening and closing relay protection circuit through photoelectric isolation, and controlling the opening and closing switch action of the multi-stage opening and closing relay protection circuit.

The display control unit comprises a liquid crystal touch screen, an input keyboard and a real-time clock are arranged below the liquid crystal touch screen, and an I/O input/output port of the central processing unit is respectively connected with the liquid crystal touch screen, the input keyboard and the real-time clock.

According to a further scheme, the display control unit further comprises an electrified display, a tripping pressing plate, a switching-off/switching-on transfer switch, an automatic air switch, a voice alarm module and an infrared induction probe, wherein the electrified display, the tripping pressing plate, the switching-off/switching-on transfer switch, the automatic air switch, the voice alarm module and the infrared induction probe are all integrated in the display control unit, wiring is completed inside the display control unit, and line connection is completed through an aviation plug.

The intelligent protection unit comprises an I/O input/output port, a program storage area, a fixed value storage area, a serial port, a timer, a static memory and an interrupt controller, wherein the central processing unit is respectively connected with the I/O input/output port, the program storage area, the fixed value storage area, the serial port, the timer, the static memory and the interrupt controller.

The serial port of the central processing unit is connected to the external communication module through multi-path photoelectric isolation, wherein the external communication module is one or more of RS485, RS232, RJ45 and CAN.

In a further aspect, the current-voltage transformer set comprises a plurality of sets of current transformers and a plurality of sets of voltage transformers, wherein the current transformers collect analog secondary side current signals, and the voltage transformers collect analog secondary side voltage signals.

According to a further scheme, the multi-stage opening and closing relay protection circuit comprises an anti-interference logic module and a multi-stage opening and closing relay, an I/O input/output port of the central processing unit is connected with the anti-interference logic module, the anti-interference logic module is connected with the multi-stage opening and closing relay, and the multi-stage opening and closing relay controls opening and closing actions.

The further scheme is that the foremost stage of the multi-stage opening and closing relay is connected with the anti-interference logic module, and the rearmost stage of the multi-stage opening and closing relay is connected with the controlled opening and closing switch.

According to a further scheme, the intelligent protection unit comprises an incoming line 16-core aerial plug and an outgoing line 58-core aerial plug which are connected with the fixed type circuit breaker switch cabinet, and the incoming line 16-core aerial plug, the outgoing line 58-core aerial plug and the interior of the intelligent protection unit and corresponding adaptive wiring form an assembly device.

The utility model has the advantages as follows:

1. because the utility model discloses an input signal filter circuit, current-voltage transformer, singlechip and multistage divide-shut brake relay protection circuit can ensure reliability and security that relay protection control exported completely, even many CPU simultaneously the procedure run away, can not cause the control export to be out of control and arouse the microcomputer protection device of controlled switch malfunction to prevent to disturb and the malfunction, simple structure, debugging convenience, with low costs.

2. Install intelligent protection unit in fixed circuit breaker, the shell adopts pure steel sheet to be complete totally closed, all adopts the isolation treatment back with external connection terminal, again with current, voltage transformer secondary line directly be connected with circuit breaker binding post, intelligent protection unit's control line has been connected well in circuit breaker inside, does not have the wiring problem.

3. The switch cabinet instrument room cabinet door is provided with a hole, a display control unit is installed, and the display control unit is connected with an intelligent protection unit installed in the circuit breaker through an aviation plug, so that the fixed value setting and the real-time related quantity display can be realized, and the product has four remote functions of remote regulation, remote measurement, remote control and the like; the display control unit displays a primary state diagram of the switch cabinet through the ultra-large touch screen, displays information such as current, voltage, electric degree and temperature and humidity in a rolling mode, and further has the functions of an electrified display, a tripping pressing plate, a KK switch, a ZK switch, a voice alarm, an infrared induction probe and the like.

[ description of the drawings ]

Fig. 1 is a schematic circuit diagram of an embodiment of the intelligent protection device of a fixed circuit breaker switch cabinet.

Fig. 2 is the utility model relates to a display control unit's wiring schematic diagram in the intelligent protection device embodiment of fixed circuit breaker cubical switchboard.

Fig. 3 is the utility model relates to a multistage divide-shut brake relay protection circuit's in the intelligent protection device system embodiment of fixed circuit breaker cubical switchboard schematic diagram.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

Referring to fig. 1 and 2, the utility model discloses an intelligent protection device of fixed circuit breaker cubical switchboard sets up in fixed circuit breaker cubical switchboard, and the device includes: the intelligent protection unit is installed in fixed circuit breaker 1, installs the display control unit 20 in the cubical switchboard instrument room, and intelligent protection unit is connected with the electrical control circuit of fixed circuit breaker 1, and display control unit 20's control line passes through the aviation plug and is connected with intelligent protection unit.

In this embodiment, the intelligent protection unit includes a housing, a circuit board disposed in the housing, the circuit board includes a central processing unit 11, a current-voltage transformer group 12, an input signal filter circuit 13, an analog-to-digital conversion input a/D circuit 14, a multi-stage opening/closing relay protection circuit 15, and an external communication module 16 connected to the central processing unit 11, a secondary line terminal of the current-voltage transformer group 12 is connected to a connection terminal of the fixed circuit breaker 1, the current-voltage transformer group 12 is connected to the input signal filter circuit 13, the input signal filter circuit 13 is connected to the analog-to-digital conversion input a/D circuit 14, the analog-to-digital conversion input a/D circuit 14 is connected to the central processing unit 11, an I/O input/output port of the central processing unit 11 is connected to an input terminal of the multi-stage opening/closing, and controls the opening and closing switch action of the multi-stage opening and closing relay protection circuit 15.

In this embodiment, the display control unit 20 includes a liquid crystal touch screen 21, an input keyboard 22 and a real-time clock 23 are disposed below the liquid crystal touch screen 21, and an I/O input/output port of the central processing unit is connected to the liquid crystal touch screen 21, the input keyboard 22 and the real-time clock 23 respectively.

Specifically, the display control unit 20 further includes a live display, a trip pressing plate, a switching-off/switching-on transfer switch, an automatic air switch, a voice alarm module, and an infrared sensing probe, and the live display, the trip pressing plate, the switching-off/switching-on transfer switch, the automatic air switch, the voice alarm module, and the infrared sensing probe are all integrated in the display control unit 20 and wired inside the display control unit 20, and the line connection is completed through an aviation plug.

In this embodiment, the intelligent protection unit includes an I/O input/output port, a program storage area, a fixed value storage area, a serial port, a timer, a static memory, and an interrupt controller, and the central processing unit 11 is connected to the I/O input/output port, the program storage area, the fixed value storage area, the serial port, the timer, the static memory, and the interrupt controller, respectively.

In this embodiment, the serial port of the central processing unit 11 is connected to the external communication module 16 through multiple paths of optoelectronic isolation, wherein the external communication module 16 is one or more of RS485, RS232, RJ45, and CAN.

In the present embodiment, the set of current-voltage transformers 12 includes a plurality of sets of current transformers and a plurality of sets of voltage transformers, the current transformers collect the simulated secondary side current signals, and the voltage transformers collect the simulated secondary side voltage signals. The current transformer is a protection CT, a measurement CT and a zero sequence CT, and simultaneously acquires an input current signal by arranging the protection CT and the special measurement CT; when the current is small, the protection device adopts the measuring signal of the special CT to measure the frequency, and when the current is large, the protection device automatically switches to the measuring signal frequency measurement of the protection CT. The zero sequence CT is also used for protection, and is used for the zero sequence current of the primary cable and the like passing through the core and the secondary measurement of whether short circuit exists or not.

In this embodiment, the multi-stage switching-on/off relay protection circuit 15 includes an anti-interference logic module 151 and a multi-stage switching-on/off relay 152, an I/O input/output port of the central processing unit 11 is connected to the anti-interference logic module 151, the anti-interference logic module 151 is connected to the multi-stage switching-on/off relay 152, and the multi-stage switching-on/off relay 152 controls the switching-on/off operation. The foremost stage of the multi-stage opening and closing relay 152 is connected with the anti-interference logic module 151, and the rearmost stage of the multi-stage opening and closing relay 152 is connected with the controlled opening and closing switch.

The anti-interference logic module 151 of this embodiment may be a programmable logic control relay, some typical relay logic control programs are pre-stored in an internal memory, and are combined and called by a user program to implement some simpler logic control and sequence control functions, and its integrated internal software functions and programming software may replace the traditional relay logic circuit, such as a logic circuit formed by a relay, a contactor, a timer, etc., and have a strong anti-interference and suppression capability.

Specifically, a typical circuit of the multi-stage opening and closing relay 152 is to divide the opening and closing relay into two stages, with the first stage controlling the second stage. And the second stage controls the opening and closing contactor of the main loop. The two-stage relay is beneficial to isolating interference generated by the on-off of the opening and closing contactor of the main loop. As shown in fig. 3, the execution sequence of the closing instruction is as follows: OUT1 → OUT2 → OUT 4. The execution sequence of the opening instruction is as follows: OUT1 → OUT3 → OUT 4. If the I/O interface is directly controlled by the central processing unit, when the I/O interface is out of control due to the fact that the central processing unit is interfered by a program to run away or a chip fails, and the level required by the switching-on and switching-off happens to be generated, the relay protection control outlet inevitably generates misoperation. Therefore, the lockout and redundancy design of the relay protection control outlet is the key to prevent the control outlet from being mistaken. Strictly monitoring the execution sequence of the opening and closing multiple commands, not allowing the unordered opening and closing commands to pass through is a basic measure for preventing the control outlet from misoperation.

In this embodiment, the intelligent protection unit includes an incoming 16-core aerial plug and an outgoing 58-core aerial plug connected to the fixed circuit breaker switch cabinet, and the incoming 16-core aerial plug, the outgoing 58-core aerial plug and the inside of the intelligent protection unit are integrated with corresponding adaptive wiring.

The embodiment also provides a fixed circuit breaker switch cabinet, and it includes high-pressure chamber, circuit breaker room, instrument room, and intelligent protection unit installs indoor at the circuit breaker, and display control unit 20 installs in the switch cabinet instrument room.

The utility model has the advantages as follows:

1. because the utility model discloses an input signal filter circuit 13, current-voltage transformer, singlechip and multistage divide-shut brake relay protection circuit 15 can ensure reliability and security that relay protection control exported completely, even many CPU simultaneously the procedure run away, can not cause the control export to be out of control and arouse the microcomputer protection device of controlled switch malfunction to prevent to disturb and the malfunction, simple structure, debugging convenience, with low costs.

2. When a power system has a fault, an analog signal of fault electrical quantity is obtained through the current-voltage transformer group 12, the analog signal is converted into digital quantity after filtering and analog-digital conversion, the digital quantity is transmitted to the central processing unit 11, the central processing unit 11 calculates fault information according to a corresponding protection algorithm and a program, and the calculation result is compared with a given setting value to judge whether the fault occurs. Once the occurrence of the fault in the area is confirmed, the opening and closing coil current of the circuit breaker and the like can be transmitted to the central processing unit 11 through the current and voltage transformer group 12, the tripping signal is fed back by the relay, and the fault information is displayed on the liquid crystal touch screen 21.

3. Install intelligent protection unit in fixed circuit breaker 1, the shell adopts pure steel sheet to be complete totally closed, all adopts the isolation treatment back with external connection terminal, again with electric current, voltage transformer secondary line directly be connected with circuit breaker binding post, intelligent protection unit's control line has connected well in circuit breaker inside, does not have the wiring problem.

4. The switch cabinet instrument room cabinet door is provided with a hole, the display control unit 20 is installed, and the intelligent protection unit installed in the circuit breaker is connected through an aviation plug, so that the fixed value setting and the real-time related quantity display can be realized, and the product has four remote functions of remote regulation, remote measurement, remote signaling, remote control and the like; the display control unit 20 displays a primary state diagram of the switch cabinet through the ultra-large touch screen, displays information such as current, voltage, electric degree and temperature and humidity in a rolling mode, and further has the functions of an electrified display, a tripping pressing plate, a KK switch, a ZK switch, a voice alarm, an infrared induction probe and the like. The equipment completes wiring inside the display module and completes circuit connection through the aviation plug. The scheme completely avoids the wiring and point aligning work of complete units and operation maintainers, and greatly reduces the workload.

5. Installation the utility model discloses a circuit breaker of intelligent protection unit has overload long time delay inverse time limit, short time delay inverse time limit, timing time limit, instantaneous function. The required protection characteristics can be set by the user; single-phase grounding protection function; displaying: setting current display, action current display and line voltage display functions; overload alarm is carried out; self-checking of overheating, microcomputer self-diagnosis; the behavior of the controller was tested.

6. The technical performance of the circuit breaker with the intelligent selective protection function reaches the advanced level of international similar products. The intelligent protection device has an intelligent protection function, is widely suitable for the requirements of an intelligent distribution network and a field bus, and realizes a four-remote function. The system integrates the functions of detection, three-section protection, monitoring, display, alarm, communication, self-diagnosis, field setting, test and the like. Has small volume. Three-stage overcurrent can be realized. Overpressure. And conventional relay protection functions such as undervoltage, three-phase reclosing, inverse time limit and the like. The adoption of full module structure and double insulation not only makes installation and maintenance convenient, but also operates breaking safely and reliably.

7. The intelligent power distribution system has a high-precision intelligent controller, can complete full selective protection of over current and residual current of a power distribution system, and is used for distributing electric energy and protecting circuits in a power distribution network and preventing power supply equipment from being damaged by faults such as overload, short circuit, under voltage, unidirectional grounding and the like. Meanwhile, the system has a communication function, and can be used as a main element for realizing the four-remote functions of remote control, remote signaling, remote measurement and remote regulation of control systems such as a field bus and the like. The intelligent circuit breaker has the characteristics of modularized structure and functional components, small volume, complete functions and the like. The product has high breaking capacity, has various mechanical linkage between operation, installation and wiring modes and products, between products and cabinet doors, has the functions of displaying, memorizing faults, setting on site, testing, thermal memory, monitoring load, self-diagnosis and the like of operation parameters, and can ensure the power supply quality and reliability of a system.

It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides an intelligent protection device of fixed circuit breaker cubical switchboard which characterized in that sets up in fixed circuit breaker cubical switchboard, the device includes:

the intelligent protection device comprises an intelligent protection unit arranged in a fixed circuit breaker and a display control unit arranged in a switch cabinet instrument room, wherein the intelligent protection unit is connected with an electrical control loop of the fixed circuit breaker, and a control line of the display control unit is connected with the intelligent protection unit through an aviation plug;

the intelligent protection unit comprises a shell and a circuit board arranged in the shell, wherein the circuit board comprises a central processing unit, a current-voltage mutual inductor group, an input signal filter circuit, an analog-digital conversion input A/D circuit, a multistage opening and closing relay protection circuit and an external communication module connected with the central processing unit, a secondary line terminal of the current-voltage mutual inductor group is connected with a wiring terminal of the fixed circuit breaker, the current-voltage mutual inductor group is connected with the input signal filter circuit, the input signal filter circuit is connected with the analog-digital conversion input A/D circuit, the analog-digital conversion input A/D circuit is connected with the central processing unit, an I/O input output port of the central processing unit is connected with an input end of the multistage opening and closing relay protection circuit through photoelectric isolation, and controlling the opening and closing switch action of the multi-stage opening and closing relay protection circuit.

2. The intelligent protection device of claim 1, wherein:

the display control unit comprises a liquid crystal touch screen, an input keyboard and a real-time clock are arranged below the liquid crystal touch screen, and an I/O input/output port of the central processing unit is respectively connected with the liquid crystal touch screen, the input keyboard and the real-time clock.

3. The intelligent protection device of claim 2, wherein:

the display control unit further comprises an electrified display, a tripping pressing plate, a switching-off/switching-on transfer switch, an automatic air switch, a voice alarm module and an infrared induction probe, wherein the electrified display, the tripping pressing plate, the switching-off/switching-on transfer switch, the automatic air switch, the voice alarm module and the infrared induction probe are all integrated in the display control unit, wiring is completed inside the display control unit, and line connection is completed through an aviation plug.

4. The intelligent protection device of claim 1, wherein:

the intelligent protection unit comprises the I/O input/output port, a program storage area, a fixed value storage area, a serial port, a timer, a static memory and an interrupt controller, and the central processing unit is respectively connected with the I/O input/output port, the program storage area, the fixed value storage area, the serial port, the timer, the static memory and the interrupt controller.

5. The intelligent protection device of claim 4, wherein:

the serial port of the central processing unit is connected to the external communication module through multi-path photoelectric isolation, wherein the external communication module is one or more of RS485, RS232, RJ45 and CAN.

6. The intelligent protection device of any one of claims 1 to 5, wherein:

the current-voltage transformer group comprises a plurality of groups of current transformers and a plurality of groups of voltage transformers, the current transformers collect analog secondary side current signals, and the voltage transformers collect analog secondary side voltage signals.

7. The intelligent protection device of any one of claims 1 to 5, wherein:

the multi-stage opening and closing relay protection circuit comprises an anti-interference logic module and a multi-stage opening and closing relay, wherein an I/O input/output port of the central processing unit is connected with the anti-interference logic module, the anti-interference logic module is connected with the multi-stage opening and closing relay, and the multi-stage opening and closing relay controls the opening and closing action.

8. The intelligent protection device of claim 7, wherein:

the most preceding stage of the multi-stage opening and closing relay is connected with the anti-interference logic module, and the last stage of the multi-stage opening and closing relay is connected with the controlled opening and closing switch.

9. The intelligent protection device of any one of claims 1 to 5, wherein:

the intelligent protection unit comprises an inlet wire 16-core aerial plug and an outlet wire 58-core aerial plug which are connected with the fixed breaker switch cabinet, and the inlet wire 16-core aerial plug, the outlet wire 58-core aerial plug and the inside of the intelligent protection unit are connected with corresponding adaptive wires to form an assembly device.

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