阅读说明：本技术 具有电磁干扰防护功能的变压器监测终端装置及监测方法 (Transformer monitoring terminal device with electromagnetic interference protection function and monitoring method ) 是由 赵明敏 李谦 杨志超 林珊珊 赵鹏 鞠勇 林文彬 林国栋 李智诚 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种具有电磁干扰防护功能的变压器监测终端装置及监测方法,所述装置包括：传感器模块对变压器的状态信息进行感知,获取状态感知信号；共形滤波模块抑制变电站中的电磁干扰,将所述状态感知信号无干扰的发送至所述变压器监测终端；变压器监测终端根据所述状态感知信号确定变压器的状态；本发明的共形滤波模块可以抑制变电站开关操作产生的瞬态电磁干扰以及浪涌、电快速瞬变脉冲群、阻尼振荡波等形成的传导干扰,能够有效的滤除智能传感器设备与变压器监测终端通信线上的干扰信号,不被变电站中复杂的电磁环境所干扰,并使得有用的通信信号完整传输至变压器监测终端,能够有效的对变压器监测终端进行电磁防护。(The invention discloses a transformer monitoring terminal device with an electromagnetic interference protection function and a monitoring method, wherein the device comprises: the sensor module senses the state information of the transformer and acquires a state sensing signal; the conformal filtering module inhibits electromagnetic interference in a transformer substation and sends the state perception signal to the transformer monitoring terminal without interference; the transformer monitoring terminal determines the state of the transformer according to the state sensing signal; the conformal filtering module can inhibit transient electromagnetic interference generated by the switch operation of the transformer substation and conducted interference formed by surge, electric fast transient pulse group, damping oscillation wave and the like, can effectively filter interference signals on a communication line between the intelligent sensor device and the transformer monitoring terminal, is not interfered by a complex electromagnetic environment in the transformer substation, enables useful communication signals to be completely transmitted to the transformer monitoring terminal, and can effectively perform electromagnetic protection on the transformer monitoring terminal.)

1. A transformer monitoring terminal device with electromagnetic interference protection function, its characterized in that, the device includes: the device comprises a transformer monitoring terminal, at least one sensor module and at least one conformal filtering module, wherein the sensor module corresponds to the conformal filtering module one by one; wherein the content of the first and second substances,

each sensor module is connected with the corresponding conformal filtering module and used for sensing the state information of the transformer and acquiring a state sensing signal;

each conformal filtering module is connected with the transformer monitoring terminal and used for inhibiting electromagnetic interference in a transformer substation and sending the state perception signal to the transformer monitoring terminal without interference;

and the transformer monitoring terminal is used for determining the state of the transformer according to the state sensing signal.

2. The apparatus of claim 1, wherein the sensor module comprises: the system comprises an iron core grounding current monitoring sensor, an oil pressure monitoring sensor, a single hydrogen monitoring sensor, a tapping switch motor current and torque monitoring sensor, a high-frequency partial discharge monitoring sensor, a sleeve dielectric loss and partial discharge monitoring sensor or an intelligent gas relay.

3. The apparatus of claim 1, wherein each sensor module interacts with a different port of the transformer monitoring terminal in wired communication via a connecting cable.

4. The apparatus of claim 3, wherein each sensor module is wired to a corresponding pin in the signal receiving port of the transformer monitoring terminal by a different type of aviation plug through a different pin of the transmitting port.

5. The apparatus of claim 1, wherein the conformal filtering module is a voltage-mode combining filter or a current-mode combining filter.

6. The apparatus of claim 5, wherein the voltage-mode combining filter comprises: the circuit comprises a first capacitor C1, a first differential mode inductor L1, a second differential mode inductor L2, a first bypass capacitor CY1, a second bypass capacitor CY2, a first common mode inductor L31, a second common mode inductor L32, a first piezoresistor MOV1, a second piezoresistor MOV2, a third piezoresistor MOV3 and a second capacitor C4; wherein the content of the first and second substances,

one end of the C1 is respectively connected with the voltage positive input end of the state sensing signal and one end of the L1, and the other end of the C1 is respectively connected with the voltage reverse input end of the state sensing signal and one end of the L2; the other end of L1 is respectively connected with one end of CY1 and one end of L31; the other end of the L31 is respectively connected with one end of the MOV1, one end of the MOV2, one end of the C4 and a positive output end; one end of the MOV2 is respectively connected with the positive output end and one end of the C4, and the other end of the MOV2 is respectively connected with one end of the MOV3 and the ground; the other end of L2 is respectively connected with one end of CY2 and one end of L32; the other end of CY2 is respectively connected with the other end of CY1 and the ground; the other end of the L32 is respectively connected with the other end of the MOV1, the other end of the MOV3 and the reverse output terminal; the other end of C4 is also connected to the inverting output.

7. The apparatus of claim 5, wherein the current-mode combining filter comprises: a third bypass capacitor CY3, a fourth bypass capacitor CY4, a third common-mode inductor L41, a fourth common-mode inductor L42, a fifth common-mode inductor L51, a sixth common-mode inductor L52, a first varistor MOV4, a second varistor MOV5 and a third varistor MOV 6; wherein the content of the first and second substances,

one end of the L41 is respectively connected with the current positive input end of the state sensing signal and the ground, and the other end of the L41 is respectively connected with one end of the L51 at one end of the CY 3; one end of the L42 is respectively connected with the current reverse input end of the state sensing signal and the ground, and the other end of the L42 is respectively connected with one end of the L52 at one end of the CY 4; the other end of CY4 is respectively connected with the other end of CY3 and the ground; the other end of the L51 is respectively connected with one end of the MOV4, one end of the MOV5 and a positive output end; the other end of the L52 is respectively connected with the other end of the MOV4, one end of the MOV6 and an inverted output terminal; the other end of the MOV5 is connected to the other end of MOV6 and ground, respectively.

8. The apparatus of claim 5, wherein the voltage-mode combining filter comprises: a DC 24V/6A combined filter, a DC 15V/6A combined filter, a DC 12V/6A combined filter and an AC 220V/6A combined filter;

the current-mode combined filter comprises: an RS485/3A signal combination filter, an RS232/3A signal combination filter, an 4/20MA signal combination filter, a potential transformer PT signal grounding combination filter and a tap changer combination filter.

9. The apparatus of claim 1, wherein the port of the transformer monitoring terminal comprises: aviation plug 4 core, aviation plug 8 cores, BNC connects, mains three-phase socket, RS485 connects and/or RJ45 net gape.

10. A transformer monitoring method using the transformer monitoring terminal device with emi protection function according to any one of claims 1 to 19, wherein the method comprises:

sensing the state information of the transformer by using a sensor module to acquire a state sensing signal;

suppressing electromagnetic interference in a transformer substation by using a conformal filtering module, and sending the state perception signal to the transformer monitoring terminal without interference;

and determining the state of the transformer by using the transformer monitoring terminal according to the state sensing signal.

Technical Field

The invention relates to the technical field of electromagnetic interference protection of a transformer monitoring terminal, in particular to a transformer monitoring terminal device with an electromagnetic interference protection function and a monitoring method.

Background

With the deep construction of the intelligent transformer substation, more and more intelligent sensors are urgently required to be applied to the transformer substation. However, the electromagnetic environment in the transformer substation is complex and changeable, strong electromagnetic interference can generate induced voltage and induced current on the connecting cable between the intelligent sensor and the intelligent monitoring terminal, and then the strong electromagnetic interference enters the intelligent sensor and the intelligent monitoring terminal through cable transmission, normal work of equipment is influenced, information transmission between the intelligent sensor and the intelligent monitoring terminal is caused to be wrong, and the abnormal state of transformer equipment cannot be found in time by workers in serious conditions, so that greater harm is caused.

The electromagnetic environment in the transformer substation is complex and changeable, and the complex electromagnetic environment refers to the sum of electromagnetic phenomena caused by a steady-state electromagnetic effect and a wide-frequency-domain transient electromagnetic effect in a wide-area space of the transformer substation. The steady electromagnetic effect refers to that a typical stable electromagnetic environment frequency spectrum generated around a transformer substation is most prominent in power frequency electromagnetic field intensity under the conventional normal working condition of the transformer substation; the wide frequency domain transient electromagnetic effect mainly refers to the drastic change of VFTO and transient electromagnetic fields around a transformer substation caused by switching operation, and is characterized in that pulse rising and falling time in a time domain is short, amplitude is large, frequency spectrum content in the frequency domain is rich, action range in a transformer substation space domain is large, particularly in an ultra/extra-high voltage transformer substation, power frequency electromagnetic field intensity, VFTO and the drastic change of the transient electromagnetic fields caused by the switching operation can seriously influence communication between intelligent sensing equipment and an intelligent monitoring terminal on one hand, and the transient electromagnetic effect provides a new challenge for the reliability of transformer state monitoring equipment in a complex electromagnetic environment.

Disclosure of Invention

The invention provides a transformer monitoring terminal device with an electromagnetic interference protection function and a monitoring method, and aims to solve the problems that in the prior art, a transformer substation monitoring terminal collects information wrongly and influences of a complex electromagnetic environment in a transformer substation on intelligent monitoring terminal equipment and information acquisition equipment are reduced.

In order to solve the above problem, according to an aspect of the present invention, there is provided a transformer monitoring terminal device having an electromagnetic interference protection function, the device including: the device comprises a transformer monitoring terminal, at least one sensor module and at least one conformal filtering module, wherein the sensor module corresponds to the conformal filtering module one by one; wherein the content of the first and second substances,

each sensor module is connected with the corresponding conformal filtering module and used for sensing the state information of the transformer and acquiring a state sensing signal;

each conformal filtering module is connected with the transformer monitoring terminal and used for inhibiting electromagnetic interference in a transformer substation and sending the state perception signal to the transformer monitoring terminal without interference;

and the transformer monitoring terminal is used for determining the state of the transformer according to the state sensing signal.

Preferably, wherein the sensor module comprises: the system comprises an iron core grounding current monitoring sensor, an oil pressure monitoring sensor, a single hydrogen monitoring sensor, a tapping switch motor current and torque monitoring sensor, a high-frequency partial discharge monitoring sensor, a sleeve dielectric loss and partial discharge monitoring sensor or an intelligent gas relay.

Preferably, each sensor module interacts with a different port of the transformer monitoring terminal in a wired communication manner through a connecting cable.

Preferably, each sensor module is connected with a corresponding pin in the signal receiving port of the transformer monitoring terminal in a wired mode through different pins of the transmitting port and different types of aviation plugs.

Preferably, the conformal filtering module is a voltage-mode combined filter or a current-mode combined filter.

Preferably, the voltage-type combining filter includes: the circuit comprises a first capacitor C1, a first differential mode inductor L1, a second differential mode inductor L2, a first bypass capacitor CY1, a second bypass capacitor CY2, a first common mode inductor L31, a second common mode inductor L32, a first piezoresistor MOV1, a second piezoresistor MOV2, a third piezoresistor MOV3 and a second capacitor C4; wherein the content of the first and second substances,

one end of the C1 is respectively connected with the voltage positive input end of the state sensing signal and one end of the L1, and the other end of the C1 is respectively connected with the voltage reverse input end of the state sensing signal and one end of the L2; the other end of L1 is respectively connected with one end of CY1 and one end of L31; the other end of the L31 is respectively connected with one end of the MOV1, one end of the MOV2, one end of the C4 and a positive output end; one end of the MOV2 is respectively connected with the positive output end and one end of the C4, and the other end of the MOV2 is respectively connected with one end of the MOV3 and the ground; the other end of L2 is respectively connected with one end of CY2 and one end of L32; the other end of CY2 is respectively connected with the other end of CY1 and the ground; the other end of the L32 is respectively connected with the other end of the MOV1, the other end of the MOV3 and the reverse output terminal; the other end of C4 is also connected to the inverting output.

Preferably, wherein the current-mode combining filter comprises: a third bypass capacitor CY3, a fourth bypass capacitor CY4, a third common-mode inductor L41, a fourth common-mode inductor L42, a fifth common-mode inductor L51, a sixth common-mode inductor L52, a first varistor MOV4, a second varistor MOV5 and a third varistor MOV 6; wherein the content of the first and second substances,

one end of the L41 is respectively connected with the current positive input end of the state sensing signal and the ground, and the other end of the L41 is respectively connected with one end of the L51 at one end of the CY 3; one end of the L42 is respectively connected with the current reverse input end of the state sensing signal and the ground, and the other end of the L42 is respectively connected with one end of the L52 at one end of the CY 4; the other end of CY4 is respectively connected with the other end of CY3 and the ground; the other end of the L51 is respectively connected with one end of the MOV4, one end of the MOV5 and a positive output end; the other end of the L52 is respectively connected with the other end of the MOV4, one end of the MOV6 and an inverted output terminal; the other end of the MOV5 is connected to the other end of MOV6 and ground, respectively.

Preferably, the voltage-type combining filter includes: a DC 24V/6A combined filter, a DC 15V/6A combined filter, a DC 12V/6A combined filter and an AC 220V/6A combined filter;

the current-mode combined filter comprises: an RS485/3A signal combination filter, an RS232/3A signal combination filter, an 4/20MA signal combination filter, a potential transformer PT signal grounding combination filter and a tap changer combination filter.

Preferably, the port of the transformer monitoring terminal comprises: aviation plug 4 core, aviation plug 8 cores, BNC connects, mains three-phase socket, RS485 connects and/or RJ45 net gape.

According to another aspect of the present invention, there is provided a transformer monitoring method using the transformer monitoring terminal device with electromagnetic interference protection function as described above, the method including:

sensing the state information of the transformer by using a sensor module to acquire a state sensing signal;

suppressing electromagnetic interference in a transformer substation by using a conformal filtering module, and sending the state perception signal to the transformer monitoring terminal without interference;

and determining the state of the transformer by using the transformer monitoring terminal according to the state sensing signal.

The invention provides a transformer monitoring terminal device with an electromagnetic interference protection function and a monitoring method, wherein the device comprises: the sensor module senses the state information of the transformer and acquires a state sensing signal; the conformal filtering module inhibits electromagnetic interference in a transformer substation and sends the state perception signal to the transformer monitoring terminal without interference; the transformer monitoring terminal determines the state of the transformer according to the state sensing signal; the conformal filtering module can inhibit transient electromagnetic interference generated by the switch operation of the transformer substation and conducted interference formed by surge, electric fast transient pulse group, damping oscillation wave and the like, can effectively filter interference signals on a communication line between the intelligent sensor device and the transformer monitoring terminal, is not interfered by a complex electromagnetic environment in the transformer substation, enables useful communication signals to be completely transmitted to the transformer monitoring terminal, and can effectively perform electromagnetic protection on the transformer monitoring terminal.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

fig. 1 is a schematic structural diagram of a transformer monitoring terminal device 100 with an emi protection function according to an embodiment of the present invention;

fig. 2 is an exemplary diagram of a transformer monitoring terminal device with electromagnetic interference protection function according to an embodiment of the invention;

FIG. 3 is a circuit diagram of a voltage-mode combination filter according to an embodiment of the present invention;

FIG. 4 is a circuit diagram of a voltage-mode combination filter according to an embodiment of the present invention;

fig. 5 is a flowchart of a transformer monitoring method 500 with emi protection according to an embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 is a schematic structural diagram of a transformer monitoring terminal device 100 with an emi protection function according to an embodiment of the present invention. As shown in fig. 1, a transformer monitoring terminal device 100 with electromagnetic interference protection function according to an embodiment of the present invention includes: the device comprises a transformer monitoring terminal 101, at least one sensor module 102 and at least one conformal filtering module 103, wherein the sensor module corresponds to the conformal filtering module one to one.

Preferably, the sensor module 102 is connected to the corresponding conformal filtering module, and is configured to sense the state information of the transformer and acquire a state sensing signal.

Preferably, the conformal filtering module 103 is connected to the transformer monitoring terminal, and is configured to suppress electromagnetic interference in a substation and send the state sensing signal to the transformer monitoring terminal without interference;

preferably, the transformer monitoring terminal 101 is configured to determine a state of the transformer according to the state sensing signal.

The transformer monitoring terminal device with the electromagnetic interference protection function provided by the embodiment of the invention comprises: the intelligent transformer monitoring system comprises an intelligent sensor module, a connecting cable of the intelligent sensor module and the intelligent transformer monitoring terminal, a conformal filtering module, a signal receiving port of the transformer monitoring terminal and the intelligent transformer monitoring terminal. The intelligent sensor can sense state information of the transformer under different conditions and upload the sensed information to the terminal; the connection cable of the intelligent sensor and the intelligent transformer monitoring terminal can supply power to the intelligent sensor and complete signal transmission; the conformal filtering module can inhibit transient electromagnetic interference generated by the switch operation of the transformer substation and stronger transient electromagnetic interference in the transformer substation such as surge, electric fast transient pulse group, damping oscillation wave and the like; the signal receiving port of the transformer monitoring terminal can provide power for the intelligent sensor and receive signals sent by the intelligent sensor; the intelligent transformer monitoring terminal can collect and process the received information, so that the state of the transformer is determined.

Preferably, wherein the sensor module comprises: the system comprises an iron core grounding current monitoring sensor, an oil pressure monitoring sensor, a single hydrogen monitoring sensor, a tapping switch motor current and torque monitoring sensor, a high-frequency partial discharge monitoring sensor, a sleeve dielectric loss and partial discharge monitoring sensor or an intelligent gas relay.

Fig. 2 is an exemplary diagram of a transformer monitoring terminal device with an emi protection function according to an embodiment of the present invention. As shown in fig. 2, 1 is a smart sensor (sensor module); 2, a connecting cable for the intelligent sensor and the transformer monitoring terminal; 3 is a conformal filtering module; 4, a signal receiving port of the transformer monitoring terminal; and 5, a transformer monitoring terminal. An intelligent sensor is connected with a conformal filtering module and is connected to a transformer monitoring terminal through a corresponding signal receiving port. The intelligent sensor can sense state information of the transformer under different conditions and upload the sensed information to the transformer monitoring terminal through the conformal filtering module.

As shown in fig. 2, there are eight types of smart sensors, including: the system comprises an iron core grounding current monitoring sensor, an oil pressure monitoring sensor, a single hydrogen monitoring sensor, a tapping switch motor current and torque monitoring sensor, a high-frequency partial discharge monitoring sensor, a sleeve dielectric loss and partial discharge monitoring sensor and an intelligent gas relay. The signal transmission ports of the eight types of intelligent sensor equipment are defined by different pins, and specifically include: +15V, -15V, 4-20mA +, 4-20mA-, +24V, GND, RS485A, RS485B, K, L and the like, and different pins define corresponding functions.

Preferably, each sensor module interacts with a different port of the transformer monitoring terminal in a wired communication manner through a connecting cable.

Preferably, each sensor module is connected with a corresponding pin in the signal receiving port of the transformer monitoring terminal in a wired mode through different pins of the transmitting port and different types of aviation plugs.

Preferably, the transformer monitoring terminal is further configured to:

the sensor module is supplied with dc power and/or ac power via a dc power line and/or an ac power line.

In the invention, the intelligent sensor and the intelligent transformer monitoring terminal are communicated in a wired mode through a connecting cable. Different pins of signal sending ports of the eight types of intelligent sensors are connected with corresponding pins in signal receiving ports of intelligent monitoring terminals of the transformer substation in a wired mode. The core wires of all port pins of each type of intelligent sensor can be wrapped by one cable and are connected with the intelligent monitoring terminal through different types of aviation plugs.

In addition, the connection cable further includes: the communication line is used for communicating the intelligent sensor with the transformer monitoring terminal; the transformer monitoring terminal is a direct current power line for supplying power to the intelligent sensor; and the transformer monitoring terminal is an alternating current power line for supplying power to the intelligent sensor. The transformer monitoring terminal can provide a direct current power supply and/or an alternating current power supply for the sensor module through a direct current power supply line and/or an alternating current power supply line.

Preferably, the conformal filtering module is a voltage-mode combined filter or a current-mode combined filter.

Preferably, the voltage-type combining filter includes: the circuit comprises a first capacitor C1, a first differential mode inductor L1, a second differential mode inductor L2, a first bypass capacitor CY1, a second bypass capacitor CY2, a first common mode inductor L31, a second common mode inductor L32, a first piezoresistor MOV1, a second piezoresistor MOV2, a third piezoresistor MOV3 and a second capacitor C4; wherein the content of the first and second substances,

one end of the C1 is respectively connected with the voltage positive input end of the state sensing signal and one end of the L1, and the other end of the C1 is respectively connected with the voltage reverse input end of the state sensing signal and one end of the L2; the other end of L1 is respectively connected with one end of CY1 and one end of L31; the other end of the L31 is respectively connected with one end of the MOV1, one end of the MOV2, one end of the C4 and a positive output end; one end of the MOV2 is respectively connected with the positive output end and one end of the C4, and the other end of the MOV2 is respectively connected with one end of the MOV3 and the ground; the other end of L2 is respectively connected with one end of CY2 and one end of L32; the other end of CY2 is respectively connected with the other end of CY1 and the ground; the other end of the L32 is respectively connected with the other end of the MOV1, the other end of the MOV3 and the reverse output terminal; the other end of C4 is also connected to the inverting output.

Preferably, wherein the current-mode combining filter comprises: a third bypass capacitor CY3, a fourth bypass capacitor CY4, a third common-mode inductor L41, a fourth common-mode inductor L42, a fifth common-mode inductor L51, a sixth common-mode inductor L52, a first varistor MOV4, a second varistor MOV5 and a third varistor MOV 6; wherein the content of the first and second substances,

one end of the L41 is respectively connected with the current positive input end of the state sensing signal and the ground, and the other end of the L41 is respectively connected with one end of the L51 at one end of the CY 3; one end of the L42 is respectively connected with the current reverse input end of the state sensing signal and the ground, and the other end of the L42 is respectively connected with one end of the L52 at one end of the CY 4; the other end of CY4 is respectively connected with the other end of CY3 and the ground; the other end of the L51 is respectively connected with one end of the MOV4, one end of the MOV5 and a positive output end; the other end of the L52 is respectively connected with the other end of the MOV4, one end of the MOV6 and an inverted output terminal; the other end of the MOV5 is connected to the other end of MOV6 and ground, respectively.

Preferably, the voltage-type combining filter includes: a DC 24V/6A combined filter, a DC 15V/6A combined filter, a DC 12V/6A combined filter and an AC 220V/6A combined filter;

the current-mode combined filter comprises: an RS485/3A signal combination filter, an RS232/3A signal combination filter, an 4/20MA signal combination filter, a potential transformer PT signal grounding combination filter and a tap changer combination filter.

In the invention, the conformal filtering module can inhibit transient electromagnetic interference generated by the switch operation of the transformer substation and stronger transient electromagnetic interference in the transformer substation such as surge, electric fast transient pulse group, damping oscillation wave and the like, and is arranged at the signal receiving port of the intelligent monitoring terminal. The conformal filtering module is provided with an input port corresponding to the intelligent sensor pin definition; the conformal filtering module is designed with an output port corresponding to the pin definition of the transformer monitoring terminal.

The types of conformal filtering modules include: a voltage mode combination filter and a current mode combination filter. Wherein the voltage-mode combination filter includes: a DC 24V/6A combined filter, a DC 15V/6A combined filter, a DC 12V/6A combined filter and an AC 220V/6A combined filter; the current-mode combined filter comprises: an RS485/3A signal combination filter, an RS232/3A signal combination filter, an 4/20MA signal combination filter, a potential transformer PT signal grounding combination filter and a tap changer combination filter.

For each conformal filtering module, a suitable combined filter can be selected according to requirements. The conformal filtering module can be used for installing different combinations according to the communication mode corresponding to the connecting wire core wire between the intelligent sensor and the transformer monitoring terminal.

Fig. 3 is a circuit diagram of a voltage-mode combining filter according to an embodiment of the present invention. As shown in fig. 3, the voltage-mode combining filter includes: the circuit comprises a first capacitor C1, a first differential mode inductor L1, a second differential mode inductor L2, a first bypass capacitor CY1, a second bypass capacitor CY2, a first common mode inductor L31, a second common mode inductor L32, a first piezoresistor MOV1, a second piezoresistor MOV2, a third piezoresistor MOV3 and a second capacitor C4; one end of the C1 is respectively connected with the voltage forward input end of the state sensing signal and one end of the L1, and the other end of the C1 is respectively connected with the voltage reverse input end of the state sensing signal and one end of the L2; the other end of L1 is respectively connected with one end of CY1 and one end of L31; the other end of the L31 is respectively connected with one end of the MOV1, one end of the MOV2, one end of the C4 and a positive output end; one end of the MOV2 is respectively connected with the positive output end and one end of the C4, and the other end of the MOV2 is respectively connected with one end of the MOV3 and the ground; the other end of L2 is respectively connected with one end of CY2 and one end of L32; the other end of CY2 is respectively connected with the other end of CY1 and the ground; the other end of the L32 is respectively connected with the other end of the MOV1, the other end of the MOV3 and the reverse output terminal; the other end of C4 is also connected to the inverting output.

For the voltage type combined filter, parameters of different components are set, so that the direct current 24V/6A combined filter, the direct current 15V/6A combined filter, the direct current 12V/6A combined filter and the alternating current 220V/6A combined filter can be realized. Wherein 24V, 15V, 12V, and 220V represent input voltages; and 6A represents the input current.

Fig. 4 is a circuit diagram of a voltage-mode combining filter according to an embodiment of the present invention. As shown in fig. 4, the current-mode combining filter includes: a third bypass capacitor CY3, a fourth bypass capacitor CY4, a third common-mode inductor L41, a fourth common-mode inductor L42, a fifth common-mode inductor L51, a sixth common-mode inductor L52, a first varistor MOV4, a second varistor MOV5 and a third varistor MOV 6; one end of L41 is connected to the current positive input end of the state sensing signal and the ground, and the other end of L41 is connected to one end of L51 of one end of CY 3; one end of the L42 is respectively connected with the current reverse input end of the state sensing signal and the ground, and the other end of the L42 is respectively connected with one end of the L52 at one end of the CY 4; the other end of CY4 is respectively connected with the other end of CY3 and the ground; the other end of the L51 is respectively connected with one end of the MOV4, one end of the MOV5 and a positive output end; the other end of the L52 is respectively connected with the other end of the MOV4, one end of the MOV6 and an inverted output terminal; the other end of the MOV5 is connected to the other end of MOV6 and ground, respectively.

For the voltage type combined filter, parameters of different components are set, so that the RS485/3A signal combined filter, the RS232/3A signal combined filter, the 4/20MA signal combined filter, the voltage transformer PT signal grounding combined filter and the tap switch combined filter can be realized. Wherein RS485 and RS232 represent signal types; 3A, 20MA represents the magnitude of the signal current.

In addition, the conformal filtering module is provided with the spring clamping groove, and the conformal filtering module is clamped on the grounding copper bar in the transformer monitoring terminal cabinet body through the spring clamping groove.

Preferably, the port of the transformer monitoring terminal comprises: aviation plug 4 core, aviation plug 8 cores, BNC connects, mains three-phase socket, RS485 connects and/or RJ45 net gape.

In the invention, the intelligent transformer monitoring terminal can provide power for the intelligent sensor, receive signals sent by the intelligent sensor and collect and process received information. The intelligent transformer monitoring terminal transmits signals through signal receiving ports in different forms, and specifically comprises an aviation plug 4 core, an aviation plug 8 core, a BNC connector, a power supply three-phase socket, an RS485 connector, an RJ45 network port and the like. And the pin definitions in the types of the ports correspond to the pin definitions of the signal ports of the intelligent sensor equipment one to one, so that communication can be carried out.

The transformer monitoring terminal device with the electromagnetic interference protection function can effectively perform electromagnetic protection on the transformer monitoring terminal, inhibit the interference of a complex electromagnetic environment in a transformer substation on the intelligent sensor and the intelligent transformer monitoring terminal, ensure normal and safe communication between the intelligent sensor and the intelligent transformer monitoring terminal, and improve the reliability of transformer state equipment.

Fig. 5 is a flowchart of a transformer monitoring method 500 with emi protection according to an embodiment of the present invention. As shown in fig. 5, a transformer monitoring method 500 using the transformer monitoring terminal device with electromagnetic interference protection function according to the embodiment of the present invention includes:

step 501, sensing the state information of the transformer by using a sensor module to acquire a state sensing signal;

502, suppressing electromagnetic interference in a transformer substation by using a conformal filtering module, and sending the state perception signal to the transformer monitoring terminal without interference;

and 503, determining the state of the transformer by using the transformer monitoring terminal according to the state sensing signal.

The transformer monitoring method 500 with emi protection according to the embodiment of the present invention corresponds to the transformer monitoring terminal device 100 with emi protection according to another embodiment of the present invention, and is not described herein again.

The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.