CN210041309U

CN210041309U - Load protection system of circuit breaker

Info

Publication number: CN210041309U
Application number: CN201921173299.5U
Authority: CN
Inventors: 王定宇; 秦洪顺
Original assignee: Hebei Bao Kai Electric Ltd By Share Ltd
Current assignee: Hebei Bao Kai Electric Ltd By Share Ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-02-07
Anticipated expiration: 2029-07-24

Abstract

A load protection system of a circuit breaker comprises a circuit breaker body, a background control device and a collection device; the acquisition device is assembled in an arc striking sheet in the breaker body, and the background control device is arranged on an original intelligent controller operating table in a workshop; the acquisition device comprises a power supply part, a temperature acquisition part and a processing part; the power supply part supplies power to the processing part and the temperature acquisition part; the temperature acquisition part comprises a temperature sensor, and the temperature sensor is connected with the P1.0 end of the first control chip; the processing part comprises a first control chip and a first wireless module; the first wireless module is connected with RX1 and TX1 ends of the first control chip, and the temperature sensor is arranged at the bottom of the acquisition device and at the bottom of the contact part of the arc striking plate. The utility model discloses a backstage controlling means and collection system realize monitoring circuit breaker operating mode's purpose, have simple structure, measure the accuracy, the accurate characteristics of protection action.

Description

Load protection system of circuit breaker

Technical Field

The utility model relates to a load protection device for when the circuit breaker high temperature, can protect the important load of its load end, belong to power switch technical field.

Background

In the occasions with high requirements on continuous power supply, such as military industry, railway traffic, aviation, petrochemical industry and the like, and in the fields with relatively severe environments, such as ferrous metallurgy, photovoltaic wind power and the like; the method is characterized in that a plurality of branch loads are simultaneously in a working state, if the superior breaker is in an abnormal working condition, the plurality of branches are broken down and power is cut off, and in order to prevent the condition, a method of setting the superior breaker action current value to cut off the branch loads is mostly adopted to realize the protection of important loads. However, this protection method is only simple current-mode monitoring and protection, and cannot make reasonable unloading and alarm instructions according to the field working conditions and the actual state of the circuit breaker. For example, the higher-level circuit breaker itself has a temperature rise problem, or the temperature rises due to the reason that the external environment temperature is too high, the copper bar is loose, and the like, so that the circuit breaker is damaged by burning and disconnected, large-area power failure is caused, even the power grid is collapsed, and at the moment, unimportant loads and important loads can face power failure faults which cannot be recovered for a long time, personal safety is endangered, and/or economic loss is caused, and great loss is caused to property of users.

The scheme for protecting the important loads at present is to arrange a circuit breaker before each load, realize the purpose of protecting the important loads by monitoring through a superior control chip, and cut off subordinate unimportant loads if the circuit breaker is overloaded, so that the superior circuit breaker reduces the capacity to achieve the purpose of not cutting off the power of the important loads. If this solution is applied under heavy load, complex line connections will be formed. Meanwhile, according to the technical scheme, when the working condition of the circuit breaker is judged, the purpose of monitoring the working condition of the circuit breaker is achieved by measuring the size of the current flowing through the circuit breaker, the current measuring mode is inaccurate in measurement, large in error, prone to being affected by short-time abnormal current, and incapable of monitoring the state and the installation working condition of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a load protection system of circuit breaker, its simple structure, it is accurate to measure, has realized the purpose to the accurate protection of important load.

The problem is solved through following technical scheme:

a load protection system of a circuit breaker comprises a circuit breaker body, a background control device and a collection device; the acquisition device is assembled in an arc striking sheet in the breaker body, and the background control device is arranged on an original intelligent controller operating table in a workshop; the acquisition device comprises a power supply part, a temperature acquisition part and a processing part; the power supply part supplies power to the processing part and the temperature acquisition part; the temperature acquisition part comprises a temperature sensor, and the temperature sensor is connected with the P1.0 end of the first control chip; the processing part comprises a first control chip and a first wireless module; the first wireless module is connected with RX1 and TX1 ends of the first control chip, and the temperature sensor is arranged at the bottom of the acquisition device and at the bottom of the contact part of the arc striking plate.

In the load protection system of the circuit breaker, the power supply part comprises the current transformer, the rectifier, the first filter capacitor, the voltage stabilizing chip and the second filter capacitor; the current transformer is connected with the input end of the rectifier; the first filter capacitor is connected in parallel with the output end of the rectifier; and the end 3 of the voltage stabilizing chip is connected with the output end of the rectifier, the end 2 is grounded, and the end 1 is connected with the IN1 end of the first control chip.

In the load protection system of the circuit breaker, the background control device comprises a second control chip, a second wireless module, a loudspeaker, a first relay, a second relay, a wiring terminal of a main load circuit breaker control loop and a wiring terminal of a secondary load circuit breaker control loop; the second wireless module is connected with RX3 and TX3 ends of the second control chip; the loudspeaker is connected with the OUT1 end of the second control chip; the first relay is connected with the OUT2 end of the second control chip, and a normally open control contact of the first relay is connected with a wiring terminal of a main load circuit breaker control loop; and the second relay is connected with the OUT3 end of the second control chip, and a normally open control contact of the second relay is connected with a wiring terminal of the secondary load circuit breaker control loop.

In the load protection system of the circuit breaker, the acquisition device is additionally provided with the first connection terminal, and the first connection terminal is connected with the RX2 and TX2 ends of the first control chip; and the background control device is additionally provided with a second connecting terminal which is connected with RX4 and TX4 ends of a second control chip. The first wiring terminal is connected with the second wiring terminal.

The utility model discloses a background control device and a collection device; the purpose of monitoring the working state of the circuit breaker in real time can be achieved, so that the effect of protecting important loads from power failure is achieved; the acquisition device comprises a power supply part, a temperature acquisition part and a processing part, and can monitor the working state of the circuit breaker in real time; the power supply part adopts the current generated by the current transformer CT to replace the power supply, so that the energy is greatly saved, and the circuit is simplified; the temperature acquisition part acquires the temperature of the contact of the circuit breaker, so that accurate temperature acquisition can be realized, and false alarm caused by inaccurate measurement is avoided; the processing part can upload temperature measurement data in real time, and the real-time performance of the data is guaranteed; the background control device gives an alarm and carries out commands of unloading unimportant loads in a grading way, so that the loads are protected in time. Especially, the temperature acquisition part uses a temperature sensor as a main element to monitor the working condition of the circuit breaker, and compared with the mode of measuring the current passing through the circuit breaker by adopting a current transformer in the past, the temperature acquisition part has the advantages of accurate measurement, small error and difficult influence of abnormal current.

Drawings

FIG. 1 is an electrical schematic diagram of the collecting device of the present invention;

FIG. 2 is a schematic view of the collection device installed inside the circuit breaker;

FIG. 3 is a partial schematic view of the acquisition device inside the circuit breaker;

FIG. 4 is a partial top view of the collection device mounting location;

FIG. 5 is an electrical schematic diagram of a background control device;

fig. 6 is a schematic view of the background control device installation.

The list of labels in the figure is: CPU1, first control chip, CPU2, second control chip, CT. current transformer, D1 rectifier, C1, first filter capacitor, C2. second filter capacitor, D2. voltage stabilization chip, RT. temperature sensor, RF1, first wireless module, RF2, second wireless module, P1, first connecting terminal, P2, second connecting terminal, P3, connecting terminal of main load circuit breaker control loop, P4, connecting terminal of secondary load circuit breaker control loop, SP. loudspeaker, J1, first relay, J2. second relay, 4, pure copper bus of static contact, 5, silver contact of static contact, 6, collecting device, 7, moving contact, 8 arc striking plate, 9, arc extinguishing grid plate, 10, background control device.

Detailed Description

Refer to fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses when carrying out circuit breaker abnormal operating mode information acquisition, in order to reach better measuring effect, adopt the temperature to gather as operating mode information, temperature sensor RT replaces current transformer monitoring, and it is more accurate to combine measuring result.

The circuit breaker inner structure is compacter for simplify the circuit, make collection system to the influence of circuit breaker as little as possible, its collection system establishes independent power supply part in and supplies power. The power supply part adopts the current generated by the current transformer CT to replace the power supply, thereby greatly saving energy, simplifying the circuit, and reducing the influence of an external power supply on the circuit breaker.

When the circuit breaker normally works, the circuit breaker is disconnected and closed by the contact and the separation and combination of the moving contact 7 and the silver contact 5 of the static contact, and when arc is extinguished, the arc striking plate 8 is connected with the arc extinguishing grid plate 9 to perform arc striking and extinguishing operations.

The utility model discloses well collection system 6 assembles inside the inside run-on plate 8 of circuit breaker body, and 8 inner spaces of run-on plate can hold collection system just, and run-on plate 8 links to each other with the pure copper busbar 4 of static contact, and pure copper busbar 4 is unanimous with run-on plate 8 temperature, can be through measuring the temperature of run-on plate 8, and indirect survey the temperature of the pure copper busbar 4 of static contact to the realization is to circuit breaker operating temperature's measurement.

Referring to fig. 5, there may be a plurality of relays for controlling the loads in the background control apparatus, when the temperature measured by the temperature sensor RT exceeds a first preset value when the loads are cut off, the loads with the lowest priority are cut off according to the priority order set by the second control chip CPU2, and when the temperature exceeds a second preset value, a load with a low priority is cut off again until important loads remain, and if the temperature exceeds a highest preset value, the important loads are cut off to protect the important loads.

The background control device receives temperature information by adopting a second wireless module RF2, and transmits the received temperature information to a second control chip CPU2, the second control chip CPU2 controls the speaker SP to alarm after information statistics judgment, and simultaneously issues a command of cutting off unimportant loads according to the importance of the loads, so that a contact switch of a second relay J2 is closed, a wiring terminal P4 of a secondary load circuit breaker control loop is in a power-on state, and the secondary loads stop working.

Referring to fig. 6, the background control device is arranged on an original intelligent controller console inside the workshop to realize timely protection of the load.

Referring to fig. 1 and 5, in order to timely read the operating condition information of the circuit breaker when the first wireless module RF1 and the second wireless module RF2 have a functional failure, a first connection terminal P1 and a second connection terminal P2 are additionally provided, so that wired communication between the second control chip CPU1 and the second control chip CPU2 is realized.

The utility model discloses at the during operation, current transformer CT will respond to the electric current that produces and through first filter capacitor C1, rectifier D1, steady voltage chip D2 and second filter capacitor C2's effect under, provide 3.3V's voltage for first control chip CPU1. The temperature sensor RT converts the collected temperature of the contact system of the circuit breaker into electric signal data and sends the electric signal data to the first control chip CPU1, the first control chip CPU1 collects the electric signal data and sends the electric signal data through the first wireless module RF1, and the second wireless module RF2 receives the electric signal data and transmits the electric signal data to the second control chip CPU 1; the second control chip CPU1 compares the received signal with the internal data, under the abnormal condition of the electrical signal data, the alarm is given once through the loudspeaker SP, and simultaneously the order of unloading unimportant load is given, at this moment, the contact switch of the second relay J2 is closed, the wiring terminal P4 of the secondary load circuit breaker control loop is in the power-on state, the secondary load stops working, while the contact switch of the first relay J1 is still kept open, the wiring terminal P4 of the main load circuit breaker control loop is in the normal power-off state, and the main load works normally.

Claims

1. A load protection system of circuit breaker, includes the circuit breaker body, its characterized in that: the device also comprises a background control device (10) and a collection device (6); the acquisition device (6) is assembled in an arc striking sheet (8) in the breaker body, and the background control device (10) is assembled on an original intelligent controller operating table in a workshop; the acquisition device (6) comprises a power supply part, a temperature acquisition part and a processing part; the power supply part is used for supplying power to the processing part and the temperature acquisition part respectively; the temperature acquisition part comprises a temperature sensor (RT), and the temperature sensor (RT) is connected with the P1.0 end of the first control chip (CPU 1); the processing section includes a first control chip (CPU1) and a first wireless module (RF 1); the first radio module (RF1) is connected to RX1 and TX1 terminals of a first control chip (CPU 1).

2. The load protection system of a circuit breaker of claim 1, wherein: the power supply part comprises a Current Transformer (CT), a rectifier (D1), a first filter capacitor (C1), a voltage stabilizing chip (D2) and a second filter capacitor (C2); the Current Transformer (CT) is connected with the input end of the rectifier (D1); the first filter capacitor (C1) is connected in parallel with the output end of the rectifier (D1); and the 3 end of the voltage stabilizing chip (D2) is connected with the output end of the rectifier (D1), the 2 end is grounded, and the 1 end is connected with the IN1 end of the first control chip (CPU 1).

3. The load protection system of a circuit breaker of claim 2, wherein: the background control device (10) comprises a second control chip (CPU2), a second wireless module (RF2), a loudspeaker (SP), a first relay (J1), a second relay (J2), a connecting terminal (P3) of a main load circuit breaker control loop and a connecting terminal (P4) of a secondary load circuit breaker control loop; the second wireless module (RF2) is connected with RX3 and TX3 terminals of a second control chip (CPU 2); the loudspeaker (SP) is connected with the OUT1 end of the second control chip (CPU 2); the first relay (J1) is connected with the OUT2 end of a second control chip (CPU2), and the control contact (J1-1) of the first relay (J1) is connected with a connecting terminal (P3) of a main load circuit breaker control loop; the second relay (J2) is connected with the OUT3 end of a second control chip (CPU2), and the control contact (J2-1) of the second relay (J2) is connected with the wiring terminal (P4) of the secondary load circuit breaker control loop.

4. The load protection system of a circuit breaker of claim 1, wherein: the acquisition device (6) is additionally provided with a first connecting terminal (P1), and the first connecting terminal (P1) is connected with RX2 and TX2 ends of a first control chip (CPU 1); the background control device is additionally provided with a second connection terminal (P2), and the second connection terminal (P2) is connected with RX4 and TX4 ends of a second control chip (CPU 2); the first connection terminal (P1) is connected with the second connection terminal (P2).