CN212872648U - Built-in circuit breaker opening and closing coil current detection device - Google Patents
Built-in circuit breaker opening and closing coil current detection device Download PDFInfo
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- CN212872648U CN212872648U CN202021226679.3U CN202021226679U CN212872648U CN 212872648 U CN212872648 U CN 212872648U CN 202021226679 U CN202021226679 U CN 202021226679U CN 212872648 U CN212872648 U CN 212872648U
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Abstract
The utility model discloses a built-in circuit breaker divide-shut brake coil current detection device, including the shell body, be provided with the control unit in the shell body, the control unit is connected with power module, EEPROM module, button and display module, USB module looks electricity respectively; the control unit is also electrically connected with an AD conversion module, the AD conversion module is respectively electrically connected with a plurality of sampling channel units, and the control unit is also provided with an SD card read-write interface. The built-in circuit breaker opening and closing coil current detection device adopts the on-chip Hall effect current sensor, realizes the electrical isolation of a device circuit and a secondary circuit of a detected circuit breaker, and is convenient to be matched with other opening and closing signal generating devices for use; the structure is light, conveniently carries, and can the simultaneous measurement multichannel divide-shut brake coil electric current, and the off-line measuring of especially adapted circuit breaker separating brake coil electric current has fine practical value.
Description
Technical Field
The utility model belongs to circuit breaker check out test set field, concretely relates to built-in circuit breaker divide-shut brake coil current detection device.
Background
In power systems, high voltage circuit breakers are irreplaceable primary devices of importance. Whether generator outlet circuit breakers or substation circuit breakers, very serious consequences are caused in case of a fault. According to the statistics at home and abroad, 60-70% of the defects or faults of the circuit breaker are caused by machinery. The high-voltage circuit breaker mostly uses an opening and closing electromagnet as a first-stage control element. The opening and closing coil controls the armature motion of the electromagnet, and further enables the transmission mechanism and the lifting mechanism to act, so that the opening and closing of the circuit breaker are realized. The current waveform of the opening and closing coil of the circuit breaker can reflect the faults of a secondary circuit of the circuit breaker, the opening and closing coil body and partial mechanical mechanism.
At present, a plurality of breaker opening and closing coil current online detection devices exist in the market, and the devices need to be installed on site to detect. However, in a circuit breaker not equipped with an on-line detection device, the detection of the opening and closing coil current is difficult.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a built-in circuit breaker divide-shut brake coil current detection device has solved the problem that current detection device can not off-line measuring.
The technical scheme adopted by the utility model is that the built-in circuit breaker opening and closing coil current detection device comprises an outer shell, wherein a control unit is arranged in the outer shell, and the control unit is respectively and electrically connected with a power module, an EEPROM module, a button, a display module and a USB module;
the control unit is also provided with an SD card read-write interface;
the control unit is also electrically connected with the AD conversion module, and the AD conversion module is respectively and electrically connected with the plurality of sampling channel units.
The utility model is also characterized in that,
the number of sampling channel units is 3-6.
Each sampling channel unit comprises a Hall effect current sensor, each Hall effect current sensor is connected with an input interface and an output interface respectively, and the input interface and the output interface are located on the surface of the outer shell.
The Hall-effect current sensor is embodied as an on-chip Hall-effect current sensor of type ACS 724.
The control unit comprises a single chip microcomputer chip with the model number of STM32F 407; the SD card read-write interface is specifically an external interface of an SPI pin on the singlechip;
the power supply module comprises a buck-boost DC-DC conversion chip with the model number of ADP 2504.
The EEPROM module includes an EEPROM chip of model AT 25256.
The key and display module comprises an LCD control chip with the model number of ILI 9320.
The USB module comprises a USB-to-TTL level chip with the model number CH 340G.
The AD conversion module comprises an AD conversion chip with the model number of AD 7606.
The utility model has the advantages that: the built-in circuit breaker opening and closing coil current detection device adopts the on-chip Hall effect current sensor, realizes the electrical isolation of a device circuit and a secondary circuit of a detected circuit breaker, and is convenient to be matched with other opening and closing signal generating devices for use; the structure is light, conveniently carries, and can the simultaneous measurement multichannel divide-shut brake coil electric current, and the off-line measuring of especially adapted circuit breaker separating brake coil electric current has fine practical value.
Drawings
Fig. 1 is a schematic structural view of the current detection device of the built-in circuit breaker opening and closing coil of the present invention;
fig. 2 is a schematic diagram of typical breaker opening and closing current waveforms and characteristic points.
In the figure, 1 is an outer shell, 2 is a control unit, 3 is a power supply module, 4 is an EEPROM module, 5 is a key and display module, 6 is an SD card read-write interface, 7 is a USB module, 8 is an AD conversion module, 9 is a Hall effect current sensor, 10 is an input interface, and 11 is an output interface.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses a built-in circuit breaker divide-shut brake coil current detection device, as shown in figure 1, includes an outer shell 1, a control unit 2 is arranged in the outer shell 1, the control unit 2 is respectively connected with a power module 3, an EEPROM module 4, a button, a display module 5 and a USB module 7; the control unit 2 is also electrically connected with the AD conversion module 8, and the AD conversion module 8 is respectively electrically connected with a plurality of sampling channel units.
The control unit 2 is also provided with an SD card read-write interface 6.
The number of the sampling channel units is 3-6, one group of circuit breakers are provided with three closing coils and three opening coils, and the number of the sampling channels can be expanded from 3 to 6. Each sampling channel unit comprises a Hall effect current sensor 9, each Hall effect current sensor 9 is connected with an input interface 10 and an output interface 11 respectively, and the input interface 10 and the output interface 11 are both positioned on the surface of the outer shell 1. Forming the 1 st, 2 nd, and 3 rd sampling channels … …, respectively.
The hall effect current sensor 9 is embodied as an on-chip hall effect current sensor of type ACS 724.
The control unit 2 comprises a single chip microcomputer chip with the model number of STM32F 407; the SD card read/write interface 6 is specifically an external interface of the SPI pin on the single chip microcomputer.
The power module 3 comprises a buck-boost DC-DC conversion chip with the model number of ADP2504, and is matched with a lithium battery, a nickel-hydrogen battery or other external direct-current power supplies for use.
The EEPROM module 4 includes an EEPROM chip of model AT 25256.
The key and display module 5 comprises an LCD control chip of the ILI9320 type.
The USB module 7 includes a USB to TTL level chip with a model CH 340G.
The AD conversion module 8 includes an AD conversion chip of model AD 7606.
The utility model discloses built-in circuit breaker divide-shut brake coil current detection device's working process as follows:
(1) the field arrangement of the device: the switching-on and switching-off signal output lead of a signal source such as an external circuit breaker mechanical characteristic tester is connected to the input interface 10, and then is connected to a three-group switching-on and switching-off coil loop of the circuit breaker through the output interface 11.
(2) And (3) waveform acquisition: the tester accomplishes the start-up and parameter setting back of device through button and display module 5, the utility model discloses the device is in real-time collection state, gather each passageway analog current signal and convert analog voltage signal into through hall effect current sensor 9 in real time, AD conversion module 8 converts analog voltage signal into digital voltage signal, and send to the control unit 2, give divide-shut brake coil actuating signal through other circuit breaker testing arrangement of outside or circuit breaker secondary circuit this moment, begin the waveform recording after the control unit 2 detects that current signal is greater than zero, store the waveform that will be surveyed, finish the waveform recording after the divide-shut brake coil current returns to zero;
(3) waveform processing and identification: the control unit 2 carries out pretreatment and characteristic point identification on the acquired current waveform, and respectively identifies 5 characteristic points (t) of the opening and closing coil acquired by the X-th sampling channelX1,IX1)，(tX2,IX2)，(tX3,IX3)，(tX4,IX4)，(tX5,IX5)；
Wherein, 5 characteristic points are specifically:
as shown in FIG. 2, 5 measured feature points (t)1，I1)，(t2，I2)，(t3，I3)，(t4，I4)，(t5，I5) Each measured characteristic point can distinguish each stage of the current:
when at t0～t1Stage t of0When the opening and closing coil of the circuit breaker is electrified, the time t1When the current reaches the maximum value I1The moving iron core starts to act under the action of current, and the stage reflects the power supply voltage and the coil resistance; when at t1～t2Stage, moving iron core movementIn the process of movement, the current gradually decreases to t2Time of day I2The stage reflects the conditions of self and mechanical load in the moving process of the moving iron core; when at t2～t3Stage t of2The movement of the movable iron core is stopped and the current rises to t again3Time of day I3The circuit breaker operating mechanism starts to drive the moving contact of the circuit breaker to move, and the abnormity of the operating mechanism is reflected at the stage; when at t3～t4Phase, current I3～I4The coil direct resistance information can be reflected basically unchanged; when at t4～t5In the stage, the auxiliary contacts are disconnected, the arc is drawn between the contacts and gradually extinguished, and the current is from t4Time of day I4Gradually decrease to t50 of the time instant.
(4) Fault identification: through the characteristic points, a tester can clearly determine important basic parameters such as a current waveform peak value, duration and the like, transverse comparison is realized by utilizing the waveform characteristic points of all channels, and longitudinal comparison is realized by utilizing stored historical data and circuit breaker data of the same model. In addition, other fault mode identification methods can be carried to realize fault judgment by depending on the operational capability of the high-performance singlechip.
The built-in circuit breaker opening and closing coil current detection device adopts the on-chip Hall effect current sensor, realizes the electrical isolation of a device circuit and a secondary circuit of a detected circuit breaker, and is convenient to be matched with other opening and closing signal generating devices for use; the structure is light, conveniently carries, and can the simultaneous measurement multichannel divide-shut brake coil electric current, and the off-line measuring of especially adapted circuit breaker separating brake coil electric current has fine practical value.
Claims (9)
1. The built-in circuit breaker opening and closing coil current detection device is characterized by comprising an outer shell (1), wherein a control unit (2) is arranged in the outer shell (1), and the control unit (2) is respectively and electrically connected with a power module (3), an EEPROM module (4), a key, a display module (5) and a USB module (7);
the control unit (2) is also provided with an SD card read-write interface (6);
the control unit (2) is also electrically connected with an AD conversion module (8), and the AD conversion module (8) is respectively electrically connected with a plurality of sampling channel units.
2. The built-in circuit breaker opening and closing coil current detection device according to claim 1, wherein the number of the sampling channel units is 3-6.
3. The built-in circuit breaker opening and closing coil current detection device according to claim 1 or 2, wherein each sampling channel unit comprises a hall effect current sensor (9), each hall effect current sensor (9) is connected with an input interface (10) and an output interface (11) respectively, and the input interface (10) and the output interface (11) are both located on the surface of the outer shell (1).
4. The built-in circuit breaker opening and closing coil current detection device according to claim 3, wherein the Hall effect current sensor (9) is an on-chip Hall effect current sensor of type ACS 724.
5. The built-in circuit breaker opening and closing coil current detection device according to claim 1, wherein the control unit (2) comprises a single chip microcomputer chip with the model number of STM32F407, and the SD card read-write interface (6) is specifically an external interface of an SPI pin on the single chip microcomputer;
the power supply module (3) comprises a buck-boost DC-DC conversion chip with the model of ADP 2504.
6. The built-in circuit breaker opening and closing coil current detection device according to claim 1, characterized in that the EEPROM module (4) comprises an EEPROM chip of type AT 25256.
7. The built-in circuit breaker opening and closing coil current detection device according to claim 1, wherein the key and display module (5) comprises an LCD control chip with the type ILI 9320.
8. The built-in circuit breaker opening and closing coil current detection device according to claim 1, wherein the USB module (7) comprises a USB-to-TTL level chip with a model number of CH 340G.
9. The built-in circuit breaker opening and closing coil current detection device according to claim 1, wherein the AD conversion module (8) comprises an AD conversion chip with the model number AD 7606.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226679.3U CN212872648U (en) | 2020-06-29 | 2020-06-29 | Built-in circuit breaker opening and closing coil current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226679.3U CN212872648U (en) | 2020-06-29 | 2020-06-29 | Built-in circuit breaker opening and closing coil current detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212872648U true CN212872648U (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021226679.3U Expired - Fee Related CN212872648U (en) | 2020-06-29 | 2020-06-29 | Built-in circuit breaker opening and closing coil current detection device |
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| Country | Link |
|---|---|
| CN (1) | CN212872648U (en) |
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2020
- 2020-06-29 CN CN202021226679.3U patent/CN212872648U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210402 |