CN216056316U - Line microcomputer protection system - Google Patents

Abstract

The utility model discloses a line microcomputer protection system, which comprises a central processing module, a protection pressing plate module for protecting a line, a power supply module for supplying energy, a communication module for communication, an execution module for executing equipment protection action, a fault event recording and inquiring module for recording and inquiring a fault event transmitted by the protection pressing plate module, and a protection fixed value setting module for setting a protection fixed value for the protection pressing plate module; the protection pressing plate module, the power supply module and the communication module are all electrically connected with the central processing module, and the output end of the central processing module is electrically connected with the execution module and the fault event recording and inquiring module. The utility model has various and complete protection types, can effectively protect the line microcomputer, has good protection effect and can greatly prolong the service life of equipment.

Description

Line microcomputer protection system

Technical Field

The utility model relates to the field of line protection, in particular to a line microcomputer protection system.

Background

The line protection system is a device which is mainly used for protecting, measuring and controlling the interval units of each voltage class, has perfect functions of protection, measurement, control, automatic switching of the standby power supply and communication monitoring, provides a complete solution for the protection and control of a transformer substation, a power plant, high-low voltage power distribution and a plant power system, and can powerfully guarantee the safe and stable operation of the high-low voltage power grid and the plant power system. However, the existing line protection system has few protection items, low integration ratio and insufficient protection effect, and cannot ensure long-term and reliable operation in a severe environment, so a line microcomputer protection system is needed.

Disclosure of Invention

In view of the above, the present invention provides a line microcomputer protection system to achieve better line protection.

In order to achieve the technical purpose, the utility model provides a line microcomputer protection system which comprises:

the protection device comprises a central processing module, a protection pressing plate module for protecting a line, a power supply module for supplying energy, a communication module for communication, an execution module for executing equipment protection actions, a fault event recording and inquiring module for recording and inquiring fault events transmitted by the protection pressing plate module and a protection constant value setting module for setting a protection constant value for the protection pressing plate module;

the protection pressing plate module, the power supply module and the communication module are all electrically connected with the central processing module, and the output end of the central processing module is electrically connected with the execution module and the fault event recording and inquiring module; the protection pressing plate module comprises a low-voltage protection unit, an overvoltage protection unit, a voltage-loss protection unit, a three-section type overcurrent protection unit, a zero-sequence overcurrent protection unit and a bus-coupler charging protection unit.

Preferably, the protection pressing plate module further comprises a low-frequency load shedding protection unit, an overload protection unit, a reclosing function unit and a post-acceleration protection unit.

Preferably, the protection pressing plate module further comprises a zero sequence overvoltage protection unit, a triple-rocker function protection unit and a PT line alarm and locking unit.

Preferably, the low-frequency load shedding protection unit is provided with slip locking low-frequency protection.

Preferably, the reclosing function unit is a three-phase three-time reclosing switch with no voltage detectable.

Preferably, the communication module is an RS485 communication module.

According to the technical scheme, the method has the following beneficial effects:

according to the utility model, the protection constant value setting module can set the protection constant value of the protection pressing plate module, when the protection constant value is set, the corresponding functional unit of the protection pressing plate module performs protection action and transmits fault information to the central processing module, the central processing module controls the execution module to work after information processing to stop the work of related equipment, and simultaneously controls the fault event recording and inquiring module to record and store the fault information, and maintenance personnel can inquire the fault information through the fault event recording and inquiring module.

In addition, the low voltage, overvoltage, voltage loss protection unit, syllogic overcurrent protection unit, zero sequence overcurrent protection unit, bus-coupler charging protection unit, low frequency deloading protection unit, overload protection unit, reclosing functional unit, after-acceleration protection unit, zero sequence overvoltage protection unit, triple-rocker functional protection unit and PT line alarm, the setting of shutting unit for the protection of system is many and complete, and then can be effectual protect the circuit, and protection effect is good.

Finally, the system is suitable for protecting overhead lines and cable lines with the voltage class of 35kV or below, can be dispersedly installed on the switch cabinet in place, and can also be installed in a centralized screen assembly mode. The perfect design ensures that the device can run reliably in severe environment for a long time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic block diagram of a line microcomputer protection system according to the present invention.

Fig. 2 is a schematic diagram of a protection pressing plate module of a line microcomputer protection system according to the present invention.

Description of the drawings: the device comprises a protection pressing plate module 1, a power supply module 2, a communication module 3, an execution module 4, a central processing module 5, a fault event recording and inquiring module 6, a protection fixed value setting module 7, a low voltage, overvoltage and no-voltage protection unit 8, a three-section type overcurrent protection unit 9, a zero sequence overcurrent protection unit 10, a bus-coupled charging protection unit 11, a low-frequency load shedding protection unit 12, an overload protection unit 13, a reclosing function unit 14, a rear accelerating protection unit 15, a zero sequence overvoltage protection unit 16, a triple-swing function protection unit 17, a 18 PT line alarming and locking unit.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings are only schematic representations of the concepts and principles of the embodiments of the disclosure, and do not necessarily show specific dimensions or proportions of the various embodiments of the disclosure. Certain features that are part of a particular figure may be exaggerated in order to illustrate relevant details or structures of embodiments of the present disclosure.

Referring to FIGS. 1-2:

example one

A line microcomputer protection system comprises a central processing module 5, a protection pressing plate module 1 for protecting a line, a power supply module 2 for supplying power, a communication module 3 for communication, an execution module 4 for executing equipment protection actions, a fault event recording and inquiring module 6 for recording and inquiring fault events transmitted by the protection pressing plate module 1, and a protection fixed value setting module 7 for setting a protection fixed value for the protection pressing plate module 1;

the protective pressing plate module 1, the power supply module 2 and the communication module 3 are electrically connected with the central processing module 5, and the output end of the central processing module 5 is electrically connected with the execution module 4 and the fault event recording and inquiring module 6; the protection pressing plate module 1 comprises a low-voltage, overvoltage and voltage-loss protection unit 8, a three-section type overcurrent protection unit 9, a zero-sequence overcurrent protection unit 10 and a bus-coupled charging protection unit 11.

Specifically, the three-stage overcurrent protection unit 9 is configured to perform a protection operation when any one of the three-phase currents exceeds a setting value and the direction is positive, and record corresponding event information through the fault event recording and querying module 6. When the corresponding voltage is less than 3V or PT disconnection occurs, the direction locking is automatically exited.

In addition, the protection pressure plate module 1 further includes a low-frequency load shedding protection unit 12, an overload protection unit 13, a reclosing function unit 14, and a post-acceleration protection unit 15. The protection pressing plate module 1 further comprises a zero sequence overvoltage protection unit 16, a triple-rocker function protection unit 17 and a PT line alarm and locking unit 18. The low frequency load shedding protection unit 12 is provided with slip locked low frequency protection. The reclosing function unit 14 is a three-phase three-time reclosing switch with no voltage detection. The communication module 3 is an RS485 communication module.

Specifically, the overload protection unit 13 performs a protection action (which may be an alarm or a trip) after any one of the three-phase currents exceeds a setting value and reaches a corresponding setting delay, and records corresponding event information through the fault event recording and querying module 6.

The zero sequence current in the zero sequence overcurrent protection unit 10 is provided by a special through zero sequence transformer, when the zero sequence current exceeds a setting value and reaches a corresponding setting delay, protection action (action can be performed on alarm and trip), and corresponding event information is recorded through the fault event recording and inquiring module 6.

In addition, the post-acceleration protection unit 15 performs protection actions after the current of the breaker is greater than the current fixed value of the acceleration section within 3 seconds from the branch switching and reaches the post-acceleration delay, and records corresponding event information through the fault event recording and query module 6.

It should be noted that the reclosing function unit 14 is started in a protection manner. The overlapping may be performed 3 times in succession at most, and the number of overlapping may be set to 1 to 3 times.

Reclosing charging conditions: 1. reclosing is put into operation; 2. the circuit breaker is in the closed position.

Reclosing discharge conditions: 1. and (4) external locking reclosing.

2. And the control loop is broken.

3. The circuit breaker is in the branch position and no three-section type overcurrent occurs.

4. Manual tripping and remote control tripping.

5. And (4) non-three-section type overcurrent tripping.

Switching-on conditions: after charging, protection tripping (quick break, time limit quick break and overcurrent) is carried out, and after the breaker is tripped, time delay reclosing is carried out.

When the utility model is used, the protection constant value setting module 7 can set the protection constant value of the protection pressing plate module 1, when the protection constant value is set, the corresponding functional unit of the protection pressing plate module 1 carries out protection action and transmits fault information to the central processing module 5, the central processing module 5 controls the execution module 4 to work and stop the work of related equipment after processing the information, and simultaneously controls the fault event recording and inquiring module 6 to record and store the fault information, and maintenance personnel can inquire the fault information through the fault event recording and inquiring module 6.

In addition, the low-voltage, overvoltage and voltage loss protection unit 8, the three-section type overcurrent protection unit 9, the zero-sequence overcurrent protection unit 10, the bus coupler charging protection unit 11, the low-frequency load shedding protection unit 12, the overload protection unit 13, the reclosing function unit 14, the rear acceleration protection unit 15, the zero-sequence overvoltage protection unit 16, the triple-swing function protection unit 17, the PT line alarm and locking unit 18 are arranged, so that the protection types of the system are various and complete, the line can be effectively protected, and the protection effect is good.

Exemplary embodiments of the proposed solution of the present disclosure have been described in detail above with reference to preferred embodiments, however, it will be understood by those skilled in the art that many variations and modifications may be made to the specific embodiments described above, and that many combinations of the various technical features and structures presented in the present disclosure may be made without departing from the concept of the present disclosure, without departing from the scope of the present disclosure, which is defined by the appended claims.

Claims (6)

1. A line microcomputer protection system is characterized by comprising a central processing module (5), a protection pressing plate module (1) for protecting a line, a power supply module (2) for supplying energy, a communication module (3) for communication, an execution module (4) for executing equipment protection actions, a fault event recording and inquiring module (6) for recording and inquiring fault events transmitted by the protection pressing plate module (1), and a protection fixed value setting module (7) for setting a protection fixed value for the protection pressing plate module (1);

the protection pressing plate module (1), the power supply module (2) and the communication module (3) are electrically connected with the central processing module (5), and the output end of the central processing module (5) is electrically connected with the execution module (4) and the fault event recording and inquiring module (6); the protection pressing plate module (1) comprises a low-voltage, overvoltage and voltage-loss protection unit (8), a three-section type overcurrent protection unit (9), a zero-sequence overcurrent protection unit (10) and a bus-coupler charging protection unit (11).

2. A line microcomputer protection system according to claim 1, characterized in that the protection platen module (1) further comprises a low frequency load shedding protection unit (12), an overload protection unit (13), a reclosing function unit (14) and a post acceleration protection unit (15).

3. A line microcomputer protection system according to claim 1 or 2, characterized in that said protection pressboard module (1) further comprises a zero sequence overvoltage protection unit (16), a triple-swing function protection unit (17) and a PT line alarm, lockout unit (18).

4. A line microcomputer protection system according to claim 2, characterized in that the low frequency load shedding protection unit (12) is provided with slip locked low frequency protection.

5. The line microcomputer protection system according to claim 1, wherein the reclosing function unit (14) is a three-phase three-time reclosing with no voltage detection.

6. A line microcomputer protection system according to claim 1, characterized in that said communication module (3) is an RS485 communication module.

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