CN209979806U - AC-DC online monitoring device - Google Patents
AC-DC online monitoring device Download PDFInfo
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- CN209979806U CN209979806U CN201920531230.9U CN201920531230U CN209979806U CN 209979806 U CN209979806 U CN 209979806U CN 201920531230 U CN201920531230 U CN 201920531230U CN 209979806 U CN209979806 U CN 209979806U
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Abstract
The utility model discloses an AC-DC online monitoring device, which comprises a CPU module, an inductive current detection module, a power supply module, a first current sensor, a communication module and a background server; the inductive current detection module comprises a capacitance probe and a signal conditioning module, the capacitance probe is arranged on the alternating current contactor, and a signal generated by the capacitance probe is conditioned by the signal conditioning module and then is transmitted to the CPU module; the power supply module supplies power to the CPU module; the first current sensor is arranged on the main circuit and used for measuring the current of the main circuit and transmitting the result to the CPU module; the communication module is connected with the CPU module. The on-line monitoring device of the utility model uses the capacitance probe to detect the contact discharge of the AC contactor, and the discharge is used as the judgment basis for the separation and combination of the AC sensor, so that the vibration data is more accurate compared with the vibration data adopted by the traditional monitoring device; meanwhile, the capacitance probe can be pasted or fixed on the shell of the alternating current contactor in other modes, and the installation is convenient.
Description
Technical Field
The utility model relates to an electrical equipment field especially relates to an online monitoring device for handing over to direct current system.
Background
In the power profession such as a railway traction power supply and transformation system, a power supply mode of an alternating current-direct current integrated system is widely adopted for stable and reliable operation of the integrated automation system. The AC-DC system is generally provided with corresponding monitoring devices and is connected with main and standby channels of a telecontrol communication manager of the integrated automation system through an RS232 interface or a 485 serial port, so that the main and standby channels are incorporated into the integrated automation system, the monitoring and control of states (switch positions, electric quantity data and states of all devices) of the AC-DC integrated system by a dispatching end are realized, and monitoring data are mainly displayed at a kiosk and an electric regulation end.
In the prior art, data monitored for an ac-dc system includes the state of an ac contactor and the current value of a main circuit; the adopted means is as follows: the vibration data of the AC contactor is collected to indirectly represent the state of the AC contactor, and a clamp meter is arranged on a main circuit to measure the current of the main circuit. The disadvantages of this approach are: 1. the vibration data is greatly influenced by the environment, and the error rate is high; 2. the clamp meter can only measure alternating current, and the compatibility is poor; 3. the installation of the monitoring device requires intervention in the ac-dc system, having an impact on the circuitry itself.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a novel AC-DC online monitoring device, improve the accuracy that detects and the compatibility of whole device.
In order to solve the technical problem, the utility model discloses a technical scheme does: an AC-DC online monitoring device comprises a CPU module, an induction type current detection module, a power supply module, a first current sensor, a communication module and a background server;
the inductive current detection module comprises a capacitance probe and a signal conditioning module, the capacitance probe is arranged on the alternating current contactor, and a signal generated by the capacitance probe is conditioned by the signal conditioning module and then is transmitted to the CPU module;
the power supply module supplies power to the CPU module;
the first current sensor is arranged on the main circuit and used for measuring the current of the main circuit and transmitting the result to the CPU module;
the communication module is connected with the CPU module, and the CPU module is used for sampling signals of the capacitance probe and the first current sensor and transmitting a processing result to the background server through the communication module.
The main contact of the alternating current contactor can generate electric arcs at the closing and opening moments, and the electric arcs enable an electromagnetic field around the alternating current contactor to generate violent change, so that an output signal of the capacitance probe is suddenly changed; the CPU module judges whether the alternating current contactor is in on-position or off-position by detecting a mutation signal of the capacitance probe; when the alternating current contactor is abnormal, the alternating current contactor continuously performs on-off switching, and the frequency of the mutation signal of the capacitance probe detected by the CPU module is increased.
Furthermore, the inductive current detection module further comprises a signal pickup module, and the signal pickup module performs voltage division filtering processing on the signal of the capacitance probe to reduce the influence of space radiation high-frequency signals; correspondingly, the signal wire of the capacitance probe is generally wrapped by a metal pipe and used for shielding space radiation high-frequency signals.
Furthermore, the online monitoring device also comprises a second current sensor, the second current sensor is arranged on a motor circuit of the alternating-current-direct-current system, the second current sensor measures the current of the motor circuit and transmits the result to the CPU module, and the CPU module performs sampling processing on the signal of the second current sensor and transmits the processing result to the background server through the communication module; the first current sensor and the second current sensor are used for measuring current data of different positions in the AC-DC system and helping electric power workers to judge the current working state of the AC-DC system; in order to avoid the influence on an AC-DC system, the first current sensor and the second current sensor both adopt Hall current sensors, the Hall current sensors can be directly clamped on cables to carry out current testing, and the cables do not need to be modified.
Furthermore, the online monitoring device also comprises a temperature and humidity sensor, the temperature and humidity sensor is installed in an electric cabinet of the AC-DC system and transmits measured temperature and humidity data to the CPU module, and the CPU module performs sampling processing on signals of the temperature and humidity sensor and transmits processing results to the background server through the communication module.
Furthermore, the online monitoring device also comprises an air pressure sensor, the air pressure sensor is arranged in an electric cabinet of the AC-DC system, the air pressure sensor transmits measured air pressure data to the CPU module, and the CPU module performs sampling processing on signals of the air pressure sensor and transmits processing results to the background server through the communication module.
Specifically, the communication module comprises a 4G communication module, a level conversion circuit of a serial communication circuit and a module working state indicating circuit; the level conversion circuit converts the level signal of the CPU module and inputs the level signal into the 4G communication module.
Has the advantages that: (1) the on-line monitoring device of the utility model uses the capacitance probe to detect the contact discharge of the AC contactor, and the discharge is used as the judgment basis for the separation and combination of the AC sensor, so that the vibration data is more accurate compared with the vibration data adopted by the traditional monitoring device; meanwhile, the capacitance probe can be pasted or fixed on the shell of the alternating current contactor in other modes, and the installation is convenient. (2) The utility model discloses an online monitoring device is electric capacity probe configuration signal pickup module and uses tubular metal resonator parcel signal line, avoids the influence of space radiation high frequency signal from signal processing and physics shielding two aspects, improves the accuracy that detects. (3) The utility model discloses an online monitoring device uses hall current sensor to measure the electric current of trunk circuit and motor circuit, and hall current sensor can directly block and carry out the current test on the cable, need not carry out the cable transformation, and is compatible good.
Drawings
Fig. 1 is a block diagram of an ac-dc online monitoring device according to embodiment 1.
Fig. 2 is a circuit diagram of a CPU module in embodiment 1.
Fig. 3 is a circuit diagram of a power supply processing module in embodiment 1.
Fig. 4 is a circuit diagram of a power reference module in embodiment 1.
Fig. 5 is a circuit diagram of an inductive current detection module according to embodiment 1.
Fig. 6 is a circuit diagram of the first current sensor in embodiment 1.
Fig. 7 is a circuit diagram of a second current sensor in embodiment 1.
FIG. 8 is a circuit diagram of a temperature and humidity sensor in accordance with embodiment 1.
Fig. 9 is a circuit diagram of the gas pressure sensor in embodiment 1.
Fig. 10 is a circuit diagram of a communication module in embodiment 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example 1
As shown in fig. 1, the ac-dc online monitoring apparatus of this embodiment includes a CPU module, an inductive current detection module, a power module, a first current sensor, a second current sensor, a temperature and humidity sensor, an air pressure sensor, a communication module, and a background server;
as shown in fig. 2, the CPU module uses an STC15F2K60S2 single chip microcomputer as a chip and configures a crystal oscillator circuit, and is configured to sample signals of the inductive current detection module, the first current sensor, the second current sensor, the temperature and humidity sensor, and the air pressure sensor;
the power supply module comprises a power supply processing module and a power supply reference module; the power supply processing module shown in fig. 3 converts a direct current 12V voltage into a 5V voltage through a 78M05 integrated chip, and the power supply reference module shown in fig. 4 converts the 5V voltage into a 2.5V voltage through an MCP1525 precision reference chip;
the circuit diagram of the inductive current detection module is shown in fig. 5, and includes a capacitance probe, a signal pickup module and a signal conditioning module; the capacitance probe is directly adhered to an alternating current contactor of an alternating current-direct current system, when a main contact of the alternating current contactor is in on-position and off-position, the main contact generates an instantaneous electric arc, and the electric arc enables an electromagnetic field around the alternating current contactor to generate violent change, so that an output signal of the capacitance probe is suddenly changed; all signals of the capacitance probe are converted into standard level signals after being subjected to voltage division filtering processing of the signal pickup module and conditioning by the signal conditioning module and then enter the CPU module; in order to better shield the space from radiating high-frequency signals, each signal wire of the induction type current detection module should be wrapped by a metal pipe;
fig. 6 and 7 are circuit diagrams of a first current sensor and a second current sensor, both of which are hall current sensors, the first current sensor being clamped on a main circuit of an ac-dc system, the second current sensor being clamped on a motor circuit of the ac-dc system; the first current sensor and the second current sensor are both connected with the CPU module;
fig. 8 and 9 are circuit diagrams of a temperature and humidity sensor and an air pressure sensor, both of which are installed in an electric cabinet of an ac-dc system, and both of which are connected to a CPU module;
the communication module comprises a 4G communication module, a level conversion circuit of a serial communication circuit and a module working state indicating circuit, and a specific circuit diagram is shown in FIG. 10; because the serial port level of the 4G communication module is not consistent with the serial port level of the single chip microcomputer of the CPU module, the level conversion between the single chip microcomputer and the 4G communication module is realized by adopting the triode circuit, and meanwhile, the output signal of the 4G communication module is adopted to drive the triode circuit to complete the indication of the working state of the 4G communication module and the connection state of the network and the server.
When the alternating current-direct current online monitoring device is applied, the CPU module samples the first current sensor, the second current sensor, the temperature and humidity sensor and the air pressure sensor and then transmits the samples to the background server through the communication module; the CPU module compares and judges the signals of the induction type current detection module, and updates the on-off position state of the primary alternating current contactor and transmits an update result to the background server when the signals are suddenly changed (generally high-voltage signals); the background server receives access to the similar terminal equipment through the Internet, and power workers can conveniently look up the access at any time.
Although the embodiments of the present invention have been described in the specification, these embodiments are only for the purpose of presentation and should not be construed as limiting the scope of the present invention. Various omissions, substitutions, and changes may be made without departing from the spirit and scope of the invention.
Claims (8)
1. An AC-DC online monitoring device is characterized in that: the system comprises a CPU module, an induction type current detection module, a power supply module, a first current sensor, a communication module and a background server;
the inductive current detection module comprises a capacitance probe and a signal conditioning module, the capacitance probe is arranged on the alternating current contactor, and a signal generated by the capacitance probe is conditioned by the signal conditioning module and then is transmitted to the CPU module;
the power supply module supplies power to the CPU module;
the first current sensor is arranged on the main circuit and used for measuring the current of the main circuit and transmitting the result to the CPU module;
the communication module is connected with the CPU module, and the CPU module is used for sampling signals of the capacitance probe and the first current sensor and transmitting a processing result to the background server through the communication module.
2. The ac-dc online monitoring device according to claim 1, wherein: the inductive current detection module further comprises a signal pickup module, and the signal pickup module carries out voltage division filtering processing on the signals of the capacitance probe.
3. The ac-dc online monitoring device according to claim 1, wherein: and the signal wire of the capacitance probe is wrapped by a metal pipe.
4. The ac-dc online monitoring device according to claim 1, wherein: the system also comprises a second current sensor, the second current sensor is arranged on a motor circuit of the AC-DC system, the second current sensor measures the current of the motor circuit and transmits the result to the CPU module, and the CPU module performs sampling processing on the signal of the second current sensor and transmits the processing result to the background server through the communication module.
5. The ac-dc online monitoring device according to claim 4, wherein: the first current sensor and the second current sensor are both Hall current sensors.
6. The ac-dc online monitoring device according to claim 1, wherein: the temperature and humidity sensor is installed in an electric cabinet of the AC-DC system and transmits measured temperature and humidity data to the CPU module, and the CPU module performs sampling processing on signals of the temperature and humidity sensor and transmits processing results to the background server through the communication module.
7. The ac-dc online monitoring device according to claim 1, wherein: the system also comprises an air pressure sensor, the air pressure sensor is arranged in an electric cabinet of the AC-DC system, the air pressure sensor transmits measured air pressure data to the CPU module, and the CPU module performs sampling processing on signals of the air pressure sensor and transmits processing results to the background server through the communication module.
8. The ac-dc online monitoring device according to claim 1, wherein: the communication module comprises a 4G communication module, a level conversion circuit of a serial communication circuit and a module working state indicating circuit; the level conversion circuit converts the level signal of the CPU module and inputs the level signal into the 4G communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920531230.9U CN209979806U (en) | 2019-04-18 | 2019-04-18 | AC-DC online monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920531230.9U CN209979806U (en) | 2019-04-18 | 2019-04-18 | AC-DC online monitoring device |
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| CN209979806U true CN209979806U (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920531230.9U Expired - Fee Related CN209979806U (en) | 2019-04-18 | 2019-04-18 | AC-DC online monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946601A (en) * | 2019-04-18 | 2019-06-28 | 中铁电气化局集团有限公司 | A kind of AC-DC on-line monitoring device |
-
2019
- 2019-04-18 CN CN201920531230.9U patent/CN209979806U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946601A (en) * | 2019-04-18 | 2019-06-28 | 中铁电气化局集团有限公司 | A kind of AC-DC on-line monitoring device |
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