High-speed rail test line harmonic monitoring device

Abstract

The utility model provides a high-speed rail test line harmonic monitoring device, which comprises a high-voltage cabinet, a multifunctional instrument, a signal surge protector, a communication management machine, a first optical fiber transceiver, a second optical fiber transceiver, an Ethernet switch and a monitoring host, and is characterized in that the high-voltage cabinet is connected with the multifunctional instrument, the multifunctional instrument is connected with the signal surge protector, and the signal surge protector is connected with the communication management machine. The signal surge protection device is connected with the communication management machine, the communication management machine is connected with the first optical fiber transceiver, the second optical fiber transceiver, the Ethernet switch and the monitoring host through the Ethernet, and a voltage transformer and a current transformer are arranged in the high-voltage cabinet. According to the utility model, harmonic signals in a power grid can be monitored in real time, early discovery and early elimination can be realized, electrical elements such as a power system, a transformer and the like can be protected, and the device is low in cost, strong in universality, stable in performance and high in popularization value.

Description

Technical Field

[0001] The utility model relates to the field of harmonic monitoring of the power supply system of high-speed multiple units, in particular to a harmonic detection device for high-speed rail test lines. Studying this set of devices can effectively monitor and alarm the high-order harmonics of the power supply system and protect the normal operation of the power system. Background Art

[0002] In the power transformation and distribution system, the reason for the generation of harmonics is that the magnetization curve of the transformer core is in a non-linear saturation state, so that the magnetization current during operation is a waveform with an angular peak, thus generating odd harmonics. Rectifier thyristors are widely used in many aspects such as switching power supplies, electromechanical control, and charging devices, bringing a considerable amount of harmonics to the power grid. The harmonics caused by frequency conversion equipment to the power grid are also increasing. Gas discharge type electric light sources such as high-pressure sodium lamps, high-pressure mercury lamps, fluorescent lamps, and metal halide lamps have a very serious non-linear volt-ampere characteristic, and some electric light sources also have a negative volt-ampere characteristic. All of these will bring odd harmonic components to the transmission power grid. Harmonics will cause the insulation of equipment to decrease, and the local temperature rise of transformers and motors to be too high. Studying a set of harmonic monitoring devices is an urgent problem to be solved. Content of the Utility Model

[0003] The purpose of the utility model is to design a monitoring device that can monitor harmonics in real time, process the detected harmonics in a timely manner, and ensure the normal operation of the power supply.

[0004] To achieve the above object, the utility model provides a harmonic monitoring device for high-speed rail test lines, including a high-voltage cabinet, a multifunctional instrument, a signal surge protector, a communication management machine, a first optical fiber transceiver, a second optical fiber transceiver, an Ethernet switch, and a monitoring host. The high-voltage cabinet is connected to the multifunctional instrument, the multifunctional instrument is connected to the signal surge protector, the signal surge protector is connected to the communication management machine, and the communication management machine is connected to the first optical fiber transceiver, the second optical fiber transceiver, the Ethernet switch, and the monitoring host through Ethernet. A voltage transformer and a current transformer are provided in the high-voltage cabinet;

[0005] The specific electrical connection of this device includes that the L terminal and N terminal of the 220V power supply are respectively connected to the U+ terminal of the multifunctional instrument, the U- terminal of the multifunctional instrument, the L terminal of the communication management machine, the N terminal of the communication management machine, the L terminal of the first optical fiber transceiver, the N terminal of the first optical fiber transceiver, the L terminal of the second optical fiber transceiver, the N terminal of the second optical fiber transceiver, the L terminal of the Ethernet switch, the N terminal of the Ethernet switch, the L terminal of the monitoring host, and the N terminal of the Ethernet switch;

[0006] The IS1 terminal of the current transformer in the high-voltage cabinet is connected to the I11 terminal of the multifunctional meter, and the IS2 terminal of the current transformer is connected to the I12 terminal of the multifunctional meter. The IA terminal of the voltage transformer in the high-voltage cabinet is connected to the V1 terminal of the multifunctional meter, and the IN terminal of the voltage transformer is connected to the VN terminal of the multifunctional meter. The D+ terminal of the multifunctional meter is connected to the terminal 1 of the signal surge protector, and the D- terminal is connected to the terminal 2 of the signal surge protector; the PE terminal of the signal surge protector is connected to the G terminal of the communication management machine, the terminal 3 of the signal surge protector is connected to the A terminal of the communication management machine, the terminal 4 of the signal surge protector is connected to the B terminal of the communication management machine, the TX terminal of the first fiber optic transceiver is connected to the TX terminal of the second fiber optic transceiver, and the RX terminal of the first fiber optic transceiver is connected to the RX terminal of the second fiber optic transceiver.

[0007] The utility model can realize the real-time monitoring of harmonic signals in the power grid, detect and eliminate them early, protect electrical components such as power systems and transformers, and has the advantages of low device cost, strong versatility, stable performance, and great popularization value. Description of the Drawings

[0008] Figure 1 It is a functional block diagram of a harmonic monitoring device for a high-speed rail test line implemented according to the utility model. Detailed Implementation Manner

[0009] The harmonic monitoring device for the high-speed rail test line mainly consists of a voltage transformer, a current transformer, a multifunctional meter, a signal surge protector, a communication management machine, a first fiber optic transceiver, a second fiber optic transceiver, an Ethernet switch, and a monitoring host hardware. The hardware wiring and parameter design of the device have been completed, realizing the automatic monitoring of harmonics.

[0010] Using core components such as current transformers, voltage transformers, and multifunctional measurement and control meters, and equipped with other ordinary and indispensable electrical components, a set of devices is developed to realize the monitoring of equipment harmonics, detect and repair them in time, and ensure the normal operation of the equipment.

[0011] Through this device, the 27.5 kV power supply system can be monitored, and other voltage level power supply systems can also be monitored. It has strong popularization ability and improves the reliability of the equipment.

[0012] Refer to Figure 1 , this patent provides an embodiment applicable to the 27.5 kV power supply system. The device components include: high-voltage cabinets, multifunctional meters, signal surge protectors, communication management machines, first fiber optic transceivers, second fiber optic transceivers, Ethernet switches, monitoring hosts and other electrical components.

[0013] Multi-function meter: PMC-53M three-phase digital multi-function power meter, the device is used for power management, energy management and energy-saving analysis, with telemetry, telesignaling, remote control, transmission functions, used in high and low voltage switch cabinets, AC panels, instrument control panels, UPS, etc., in industry, construction, civil power supply systems and substations, saving investment and use space. PMC-53M three-phase digital multi-function power meter is based on industrial-grade microprocessor, 0.5S-level measurement accuracy, large-screen LCD display, compact size, and equipped with RS-485 communication port, which can communicate with the background monitoring computer through communication management machine and other related equipment.

[0014] The first fiber optic transceiver and the second fiber optic transceiver are generally used in actual network environments where Ethernet cables cannot cover and optical fibers must be used to extend the transmission distance. The economic cost is low. The function of the fiber optic transceiver is to convert the transmitted electrical signal into an optical signal and send it out. At the same time, it can convert the received optical signal into an electrical signal and input it into the receiving end.

[0015] Among them, the high-voltage cabinet adopts a 27.5KV high-voltage cabinet, the 27.5KV high-voltage cabinet is connected to a multi-function instrument, the multi-function instrument is connected to a signal surge protector, and the signal surge protector is connected to a communication management machine.

[0016] The communication management machine is connected with the first optical fiber transceiver, the second optical fiber transceiver, the Ethernet switch and the monitoring host through Ethernet.

[0017] The electrical schematic of this device and the analysis of the schematic are shown below.

[0018] The 220V power supply L and N are respectively connected to the U+ and U- terminals of the multi-function instrument, the L and N terminals of the communication management machine, the L and N terminals of the optical fiber transceiver A, the L and N terminals of the optical fiber transceiver B, the L and N terminals of the Ethernet switch, and the L and N terminals of the monitoring host.

[0019] The IS1 terminal of the 1LH current transformer of the 27.5KV high-voltage cabinet is connected to the I11 terminal of the multi-function instrument, the IS2 terminal of the 1LH current transformer is connected to the I12 terminal of the multi-function instrument, the IA terminal of the 1YH voltage transformer of the 27.5KV high-voltage cabinet is connected to the V1 terminal of the multi-function instrument, the IN terminal of the 1YH voltage transformer is connected to the VN terminal of the multi-function instrument, the D+ terminal of the multi-function instrument is connected to the 1 terminal of the signal surge protector, the D- terminal is connected to the 2 terminal of the signal surge protector, the PE terminal of the signal surge protector is connected to the G terminal of the communication management machine, the 3 terminal is connected to the A terminal of the communication management machine, the 4 terminal is connected to the B terminal of the communication management machine, the TX terminal of the first optical fiber transceiver is connected to the TX terminal of the second optical fiber transceiver, and the RX terminal of the first optical fiber transceiver is connected to the RX terminal of the second optical fiber transceiver.

Claims

1. A harmonic monitoring device for a high-speed rail test line, characterized in that, It includes a high-voltage cabinet, a multifunctional meter, a signal surge protector, a communication management machine, a first fiber optic transceiver, a second fiber optic transceiver, an Ethernet switch, and a monitoring host. The high-voltage cabinet is connected to the multifunctional meter, the multifunctional meter is connected to the signal surge protector, the signal surge protector is connected to the communication management machine, and the communication management machine is connected to the first fiber optic transceiver, the second fiber optic transceiver, the Ethernet switch, and the monitoring host through Ethernet. A voltage transformer and a current transformer are provided in the high-voltage cabinet; The specific electrical connections of this device include that the L terminal and N terminal of the 220V power supply are respectively connected to the U+ terminal of the multifunctional meter, the U- terminal of the multifunctional meter, the L terminal of the communication management machine, the N terminal of the communication management machine, the L terminal of the first fiber optic transceiver, the N terminal of the first fiber optic transceiver, the L terminal of the second fiber optic transceiver, the N terminal of the second fiber optic transceiver, the L terminal of the Ethernet switch, the N terminal of the Ethernet switch, the L terminal of the monitoring host, and the N terminal of the Ethernet switch; The IS1 terminal of the current transformer in the high-voltage cabinet is connected to the I11 terminal of the multifunctional meter, the IS2 terminal of the current transformer is connected to the I12 terminal of the multifunctional meter, the IA terminal of the voltage transformer in the high-voltage cabinet is connected to the V1 terminal of the multifunctional meter, the IN terminal of the voltage transformer is connected to the VN terminal of the multifunctional meter, the D+ terminal of the multifunctional meter is connected to the 1 terminal of the signal surge protector, and the D- terminal is connected to the 2 terminal of the signal surge protector; the PE terminal of the signal surge protector is connected to the G terminal of the communication management machine, the 3 terminal of the signal surge protector is connected to the A terminal of the communication management machine, the 4 terminal of the signal surge protector is connected to the B terminal of the communication management machine, the TX terminal of the first fiber optic transceiver is connected to the TX terminal of the second fiber optic transceiver, and the RX terminal of the first fiber optic transceiver is connected to the RX terminal of the second fiber optic transceiver.

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