CN214409118U - Current transformer device with zero-crossing and clock-to-time double synchronization functions - Google Patents
Current transformer device with zero-crossing and clock-to-time double synchronization functions Download PDFInfo
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- CN214409118U CN214409118U CN202022996536.7U CN202022996536U CN214409118U CN 214409118 U CN214409118 U CN 214409118U CN 202022996536 U CN202022996536 U CN 202022996536U CN 214409118 U CN214409118 U CN 214409118U
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Abstract
The utility model provides a current transformer device with zero passage and clock to time bisynchronization function, including current transformer, master control MCU, current detection circuit, zero passage synchronization circuit, GPS clock time service chip, WIFI communication chip. The input end of each current detection circuit is connected with the secondary side of a current transformer, the output end of each current detection circuit is divided into two paths, one path is directly connected to a port of the main control MCU, and the other path is connected to the zero-crossing synchronization circuit firstly and then is connected to the port of the main control MCU. The port of the master control MCU is also connected with the GPS clock timing chip and the WIFI communication chip, clock timing is carried out through the GPS clock timing chip, and the WIFI network is connected through the WIFI communication chip. The current sampling device is used for sampling current in a single-line or multi-line synchronous power flow test, can complete a synchronous function at an acquisition end, namely a test front end, while acquiring multiple points in a line, and improves the synchronous precision, thereby improving the precision of subsequent analysis results.
Description
Technical Field
The utility model relates to an electric power system technical field, in particular to current transformer device with zero passage and clock to time bisynchronization function.
Background
In the synchronous power flow analysis of the power line, the current in the line needs to be detected and analyzed synchronously, however, the current detection of the existing power line adopts a universal current transformer, the data acquired by the universal current transformer is transmitted to a remote background system server and then analyzed, the downward extension of the synchronous precision is obvious, the precision of analyzing the power flow is not good, and the analysis result is influenced. Therefore, a current collecting device capable of realizing synchronization at a detection collecting end is needed, so that the problems are avoided.
Disclosure of Invention
In order to solve the technical problem that the background art provided, the utility model provides a current transformer device with zero passage and clock to time bisynchronization function for to the current sampling in single line or the synchronous power trend test of multiline, can be when gathering the multiple spot in the circuit, just also can accomplish the synchro function at the collection end at the test front end, improve synchronous precision, thereby improve subsequent analysis results's precision.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a current transformer device with zero-crossing and clock-to-clock double synchronization functions comprises a current transformer and a synchronization detection device.
The synchronous detection device comprises a main control MCU, a current detection circuit, a zero-crossing synchronization circuit, a GPS clock time service chip and a WIFI communication chip.
The current transformer comprises a plurality of current detection circuits and zero-crossing synchronization circuits, the input end of each current detection circuit is connected with the secondary side of one current transformer, the output end of each current detection circuit is divided into two paths, one path is directly connected to a port of the main control MCU, the other path is connected to the zero-crossing synchronization circuit firstly and then connected to the port of the main control MCU through the zero-crossing synchronization circuit.
The port of the master control MCU is also connected with the GPS clock timing chip and the WIFI communication chip, clock timing is carried out through the GPS clock timing chip, and the WIFI network is connected through the WIFI communication chip.
Furthermore, each current detection circuit has the same structure and comprises a small current transformer, a filter inductor and a first operational amplifier circuit which are sequentially connected from an input end to an output end, wherein the input end of the small current transformer is connected with the secondary side of an external current transformer, the current of the secondary side of the current transformer is further changed into the small current of 2.5mA, and the small current transformer and the first operational amplifier circuit output current detection signals and are respectively connected to the input end of the zero-crossing synchronization circuit and the master control MCU.
Furthermore, each zero-crossing synchronization circuit has the same structure and comprises an input resistor and a second operational amplification circuit which are sequentially connected from the input end to the output end, a signal output by the current detection circuit is connected to the input end of the second operational amplification circuit after passing through the input resistor, the amplification factor of the second operational amplification circuit is 10-20, and the output end of the second operational amplification circuit is connected to the main control MCU.
Further, the current transformer is an open-type current transformer.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model is provided with a plurality of current transformers and a plurality of current acquisition circuits, and each current transformer can acquire the current of one acquisition point in the power line;
2) the zero-crossing synchronization circuit can amplify the acquired current waveform by 10-20 times, the current waveform is close to a square wave at the zero point, the rising edge of the current waveform can be used as the zero crossing point of the current waveform, so that the zero-crossing synchronization of the current acquired by each current transformer is realized, the zero-crossing synchronization is carried out at the acquisition end, and the acquired current is transmitted to the server for analysis after being subjected to the zero-crossing synchronization;
3) the GPS time service chip is used for carrying out GPS time service synchronization on the acquired current;
4) the WIFI communication chip is used for being connected with a WIFI communication network and is connected with a remote server through the WIFI communication network.
Drawings
Fig. 1 is a block diagram of the overall circuit structure of the present invention;
FIG. 2 is a circuit diagram of the current collecting circuit of the present invention
Fig. 3 is a circuit diagram of the zero-crossing synchronization circuit of the present invention;
fig. 4 is a circuit diagram of the main control MCU of the present invention;
FIG. 5 is a circuit diagram of the GPS time service chip of the present invention;
fig. 6 is the utility model discloses a circuit diagram of WIFI communication chip.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, a current transformer device with zero-crossing and clock-to-clock double synchronization functions includes a current transformer and a synchronization detection device. The current transformer is an open-type current transformer.
The synchronous detection device comprises a main control MCU, a current detection circuit, a zero-crossing synchronization circuit, a GPS clock time service chip and a WIFI communication chip.
The current transformer comprises a plurality of current transformers (3 in the figure), the current detection circuits and the zero-crossing synchronization circuits also comprise a plurality of current transformers, the input end of each current detection circuit is respectively connected with the secondary side of one current transformer, the output end of each current detection circuit is divided into two paths, one path of current detection circuit is directly connected to a port of the main control MCU, the other path of current detection circuit is connected to the zero-crossing synchronization circuit firstly and then is connected to the port of the main control MCU through the zero-crossing synchronization circuit.
The port of the master control MCU is also connected with a GPS clock timing chip and a WIFI communication chip, clock timing is carried out through the GPS clock timing chip, and the WIFI communication network is connected through the WIFI communication chip.
As shown in fig. 2, each of the current detection circuits has the same structure (taking the detection circuit of the first current transformer as an example), and includes a small current transformer CT1, a filter inductor L14, and an L15, which are connected in sequence from an input end to an output end, and a first operational amplifier circuit composed of a first operational amplifier U4A, wherein the input end of the small current transformer CT1 is connected to the secondary side of an external current transformer, the current on the secondary side of the current transformer further becomes a small current of 2.5mA, and a current detection signal IA1 is output after passing through the filter inductors L14, L15 and the first operational amplifier U4A, and is respectively connected to the input end of the zero-crossing synchronization circuit and the main control MCU.
As shown in fig. 3, each of the zero-crossing synchronizing circuits has the same structure (taking the zero-crossing synchronizing circuit of the first current transformer as an example), and includes an input resistor R15 and a second operational amplifier circuit U5B, which are sequentially connected from an input end to an output end, a signal IA1 output by the current detection circuit is connected to the input end of the second operational amplifier circuit via the input resistor, the amplification factor of the second operational amplifier circuit is 10-20, and the output end of the second operational amplifier circuit is connected to the main control MCU.
As shown in fig. 4, for the utility model discloses a master control MCU's circuit diagram, the master control MCU of this embodiment adopts ATXMEGA series singlechip, its 1-3 number pin IA1-IA3 is used for connecting 3 way current detection circuit's signal, 17-19 number pin AERO1-ZERO3 is used for connecting ZERO cross synchronous circuit's signal, 30-32, 36, 37 number pin are used for connecting the GPS clock time service chip of fig. 5, 38-41, 57, 58 number pin are used for connecting the WIFI communication chip of fig. 6.
As shown in fig. 5, which is a circuit diagram of a GPS clock time service chip, pins 13, 15, 16, 20 and 8 are connected to a main control MCU, corresponding to the pin numbers of fig. 4, and pin 4 is connected to a GPS antenna.
As shown in fig. 6, which is a circuit diagram of the WIFI communication chip, pins 1 to 9 of the WIFI communication chip are connected to the main control MCU, and correspond to the pins of the main control MCU in fig. 4.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (4)
1. A current transformer device with zero-crossing and clock-to-clock double synchronization functions is characterized by comprising a current transformer and a synchronization detection device;
the synchronous detection device comprises a main control MCU, a current detection circuit, a zero-crossing synchronous circuit, a GPS clock time service chip and a WIFI communication chip;
the current transformers comprise a plurality of current detection circuits and zero-crossing synchronization circuits, the input end of each current detection circuit is connected with the secondary side of one current transformer, the output end of each current detection circuit is divided into two paths, one path is directly connected to a port of the main control MCU, the other path is connected to the zero-crossing synchronization circuit firstly and then connected to the port of the main control MCU through the zero-crossing synchronization circuit;
the port of the master control MCU is also connected with the GPS clock timing chip and the WIFI communication chip, clock timing is carried out through the GPS clock timing chip, and the WIFI network is connected through the WIFI communication chip.
2. The current transformer device with the function of double synchronization of zero-crossing and clock-to-time as claimed in claim 1, wherein each of the current detection circuits has the same structure, and comprises a small current transformer, a filter inductor and a first operational amplifier circuit which are sequentially connected from an input end to an output end, wherein the input end of the small current transformer is connected to the secondary side of an external current transformer, the current on the secondary side of the current transformer is further changed into a small current of 2.5mA, and a current detection signal is output after passing through the filter inductor and the first operational amplifier circuit and is connected to the input end of the zero-crossing synchronization circuit and the main control MCU.
3. The current transformer device with the function of double synchronization of zero-crossing and clock-pair according to claim 1, wherein each zero-crossing synchronization circuit has the same structure, and comprises an input resistor and a second operational amplifier circuit which are sequentially connected from an input end to an output end, wherein a signal output by the current detection circuit is connected to the input end of the second operational amplifier circuit after passing through the input resistor, the amplification factor of the second operational amplifier circuit is 10-20, and the output end of the second operational amplifier circuit is connected to the main control MCU.
4. The current transformer device with the function of double synchronization of zero crossing and clock pair as claimed in claim 1, wherein the current transformer is an open type current transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022996536.7U CN214409118U (en) | 2020-12-14 | 2020-12-14 | Current transformer device with zero-crossing and clock-to-time double synchronization functions |
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| CN202022996536.7U CN214409118U (en) | 2020-12-14 | 2020-12-14 | Current transformer device with zero-crossing and clock-to-time double synchronization functions |
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| CN214409118U true CN214409118U (en) | 2021-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114025254A (en) * | 2021-11-09 | 2022-02-08 | 国网四川省电力公司营销服务中心 | Synchronous sampling method and system for different branch currents |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114025254A (en) * | 2021-11-09 | 2022-02-08 | 国网四川省电力公司营销服务中心 | Synchronous sampling method and system for different branch currents |
| CN114025254B (en) * | 2021-11-09 | 2024-01-23 | 国网四川省电力公司营销服务中心 | Synchronous sampling method and system for currents of different branches |
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