CN213302482U - Insulation monitoring circuit for completing connection of charging piles on line - Google Patents
Insulation monitoring circuit for completing connection of charging piles on line Download PDFInfo
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- CN213302482U CN213302482U CN202022522879.XU CN202022522879U CN213302482U CN 213302482 U CN213302482 U CN 213302482U CN 202022522879 U CN202022522879 U CN 202022522879U CN 213302482 U CN213302482 U CN 213302482U
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Abstract
The invention relates to an insulation monitoring circuit for completing connection of a charging pile on line, wherein a live wire of a three-phase line of the charging pile is connected with a first coil n1, a second coil n2 is connected between the live wire and a ground wire, an ammeter A1 is connected into a circuit of the first coil n1 and used for measuring the current of the first coil n1, if a reading appears in the ammeter A1, the live wire and the ground wire form a closed loop to indicate that the charging pile leaks electricity, and if the reading of the ammeter A1 is 0, the charging pile is in an insulation state; and entering the next step, an ammeter A2 is connected into a second coil n2 circuit, and a detection voltage is input into a first coil n1, so that the second coil n2 generates a mutual-inductance high voltage, if the reading of the ammeter A2 appears, the charging pile is subjected to high-voltage leakage, and if the reading of the ammeter A2 is 0, the charging pile is subjected to high-voltage insulation.
Description
Technical Field
The invention relates to insulation monitoring, in particular to an insulation monitoring circuit for completing connection of charging piles on line.
Background
Along with electric automobile charging station and fill a large amount of constructions and applications of electric pile, its security receives more and more attention. Especially, direct current fills electric pile power big, bulky, voltage height to often be furnished with the battery and carry out the energy storage, the structure is complicated. When the output direct current side of the charging pile is not good in insulation, equipment damage, fire disasters and personal electric shock can be caused. Since the leakage fault on the dc output side cannot make the leakage protector on the ac side operate, it is important to add a dc side insulation monitoring and ground fault protection device. The existing charging pile insulation monitoring method is mainly based on bridge method for monitoring, wherein a balanced bridge method and an unbalanced bridge method are included, for example, Chinese patent publication No. CN210803652U discloses an insulation detection system combining a charging pile balanced bridge and an unbalanced bridge, which comprises a main control CPU, a control bridge circuit and an acquisition circuit for data communication; a 12V power supply, which is provided with a 12V power supply externally for voltage stabilization and filtering; the 5V power supply is formed by voltage reduction and conversion of a 12V power supply and supplies power and 3.3V power to the acquisition circuit; the acquisition circuit acquires the voltage of a bus of the bridge circuit to ground and transmits the acquired data to the master control CPU; and the control system is in data communication with the main control CPU and issues an insulation monitoring name to the main control CPU. The utility model discloses an adopt two sets of acquisition circuit insulation to detect, can fill electric pile to two simultaneously and carry out insulation detection.
The prior art has the following disadvantages: in addition to the complicated wiring of the balanced bridge method, the balanced bridge method can only detect whether the leakage current exists in a normal state, namely, the balanced bridge method works in a rated voltage or within a voltage fluctuation range allowed by a system, and cannot detect whether the leakage current exists in a high-voltage state.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an insulation monitoring circuit for completing the connection of charging piles on line, which has a simple circuit structure, can realize insulation detection in a conventional state and can also realize insulation detection in a high-voltage state, thereby improving the reliability of detection.
The purpose of the invention is realized by the following technical scheme:
an insulation monitoring circuit that electric pile is connected is filled in online completion, includes:
the charging pile comprises a live wire + HV and a ground wire GND of the charging pile, a primary winding circuit formed by connecting a first coil n1 and an ammeter A1 in series, and a secondary winding circuit formed by connecting a second coil n2 and an ammeter A2 in series;
the primary winding circuit is connected with a live wire + HV, and the secondary winding circuit is connected between the live wire + HV and a ground wire GND in series, so that a mutual inductance coil is formed between the first coil n1 and the second coil n2, wherein the number of turns of the first coil n1 is smaller than that of the second coil n 2.
Compared with the traditional balanced bridge test, the scheme has the technical progress of simple wiring and convenient test, and the insulation detection can be realized only by two mutual inductors.
This scheme utilization is reverse to be stepped up, utilizes mutual inductor to boost for the live wire and forms a high pressure, can detect and fill electric pile whether electric leakage under high-pressure state, and it is more to compare the environment that this scheme detected in traditional balanced bridge, has the more comprehensive technological progress of monitoring data.
Further, the ratio of the number of the first coil n1 to the number of the second coil n2 is 1: 10.
Further, the sensitivity of the ammeter A1 and the ammeter A2 is at least in mA order. The design is to improve the sensitivity of the ammeter, namely to improve the sensitivity of the insulation monitoring of the method.
The invention has the beneficial effects that: compared with the traditional balanced bridge method, the scheme only needs to introduce a group of mutual inductors, so that the insulation detection can be realized, meanwhile, the insulation detection under a high-voltage state can also be realized, the test circuit is simplified, and the reliability of the detection result is improved.
Drawings
Fig. 1 is an insulation monitoring wiring circuit of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following.
Referring to fig. 1, an insulation monitoring circuit for completing connection of charging piles on line includes:
the charging pile comprises a live wire + HV and a ground wire GND of the charging pile, a primary winding circuit formed by connecting a first coil n1 and an ammeter A1 in series, and a secondary winding circuit formed by connecting a second coil n2 and an ammeter A2 in series;
the primary winding circuit is connected with the live wire + HV, and the secondary winding circuit is connected between the live wire + HV and the ground wire GND in series, so that a mutual inductor is formed between the first coil n1 and the second coil n2, wherein the number of turns of the first coil n1 is smaller than that of the second coil n2
Referring to fig. 1, the charging pile is a three-phase charging circuit, which includes a live wire + HV, a zero wire-HV and a ground wire GND, wherein the ground wire GND is grounded.
The charging pile comprises a branch led out from a live wire and an HV and is used for serially connecting a first coil n1 and an ammeter A1, a second coil n2 and an ammeter A2 are serially connected between the live wire and the HV and a ground wire GND, so that the first coil n1 and the second coil n2 form a group of mutual inductors, after the charging pile leaks electricity, namely a closed loop is formed between the live wire and the HV and the ground wire GND, the first coil n1 can generate mutual inductance current, the ammeter A1 generates reading, namely electricity leakage, and if the ammeter A1 does not have reading, the live wire and the HV and the ground wire GND do not form a closed loop and are in an insulation state.
The embodiment also provides a method for testing an insulation monitoring circuit for completing connection of a charging pile on line, which comprises the following steps:
1) a first coil n1 is connected to a live wire of a three-phase wire of the charging pile, a second coil n2 is connected between the live wire and a ground wire, so that a mutual inductor is formed between the first coil n1 and the second coil n2, wherein the number of turns of the first coil n1 is smaller than that of the second coil n 2;
2) an ammeter A1 is connected to the circuit of the first coil n1 and used for measuring the current of the first coil n1, if the ammeter A1 shows that a reading shows that a live wire and a ground wire form a closed loop and shows that the charging pile leaks electricity, and if the ammeter A1 shows that the reading is 0, the charging pile is in an insulation state.
Optionally, a method for testing an insulation monitoring circuit that completes connection of a charging pile on line includes:
1) a first coil n1 is connected to a live wire of a three-phase wire of the charging pile, a second coil n2 is connected between the live wire and a ground wire, so that a mutual inductor is formed between the first coil n1 and the second coil n2, wherein the number of turns of the first coil n1 is smaller than that of the second coil n 2;
2) an ammeter A1 is connected to the circuit of the first coil n1 and used for measuring the current of the first coil n1, if the ammeter A1 reads, a closed loop is formed between a live wire and a ground wire, the charging pile leaks electricity, and if the ammeter A1 reads 0, the charging pile is in an insulation state;
if the charging pile is in an insulation state, entering the next step, and performing a high-voltage electric leakage test;
3) an ammeter A2 is connected to the circuit of the second coil n2, a detection voltage is input to the first coil n1, the second coil n2 generates a mutual inductance high voltage, if the reading of the ammeter A2 appears, the charging pile is subjected to high-voltage leakage, and if the reading of the ammeter A2 is 0, the charging pile is subjected to high-voltage insulation.
Optionally, the ratio of the number of coils of the first coil n1 to the number of coils of the second coil n2 is 1: 10. The mutual-inductance high voltage is more than 500V. The sensitivity of the ammeter A1 and the ammeter A2 is at least in mA level, and in some precise occasions, the sensitivity can be even microampere level uA.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The utility model provides an accomplish on line and fill insulation monitoring circuit that electric pile connects which characterized in that includes:
the charging pile comprises a live wire + HV and a ground wire GND of the charging pile, a primary winding circuit formed by connecting a first coil n1 and an ammeter A1 in series, and a secondary winding circuit formed by connecting a second coil n2 and an ammeter A2 in series;
the primary winding circuit is connected with a live wire + HV, and the secondary winding circuit is connected between the live wire + HV and a ground wire GND in series, so that a mutual inductance coil is formed between the first coil n1 and the second coil n2, wherein the number of turns of the first coil n1 is smaller than that of the second coil n 2.
2. The insulation monitoring circuit for completing charging pile connection on line as claimed in claim 1, wherein the ratio of the number of the first coil n1 to the number of the second coil n2 is 1: 10.
3. The insulation monitoring circuit for completing charging pile connection on line as claimed in claim 2, wherein the sensitivity of ammeter A1 and ammeter A2 is at least mA level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022522879.XU CN213302482U (en) | 2020-11-04 | 2020-11-04 | Insulation monitoring circuit for completing connection of charging piles on line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022522879.XU CN213302482U (en) | 2020-11-04 | 2020-11-04 | Insulation monitoring circuit for completing connection of charging piles on line |
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| CN213302482U true CN213302482U (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985178B (en) * | 2021-10-29 | 2024-06-11 | 章鱼博士智能技术(上海)有限公司 | Charging pile state detection method, device, equipment and storage medium |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985178B (en) * | 2021-10-29 | 2024-06-11 | 章鱼博士智能技术(上海)有限公司 | Charging pile state detection method, device, equipment and storage medium |
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