CN203204121U

CN203204121U - Online monitoring system for insulation of power transformation equipment

Info

Publication number: CN203204121U
Application number: CN 201320243980
Authority: CN
Inventors: 傅中君; 王旭敏
Original assignee: CHANGZHOU SHUNCHUANG ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: CHANGZHOU SHUNCHUANG ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2013-05-07
Filing date: 2013-05-07
Publication date: 2013-09-18
Anticipated expiration: 2023-05-07

Abstract

The utility model discloses an online monitoring system for insulation of power transformation equipment. The system comprises an embedded processor, a touch screen connected with the embedded processor, a network communication interface, a plurality of serial ports and a relay; the serial ports are connected with a current measurement device for measuring leakage current of an MOA or a capacitive device; the current measurement device comprises a first mutual inductor for obtaining a leakage current signal of the MOA or the capacitive device, a second mutual inductor for obtaining a voltage signal of a power grid, a synchronous AFC connected with the first and second mutual inductors, a CPU connected with the synchronous ADC, and a communication module connected with the CPU; the CPU is connected with the embedded processor through a serial port; and the relay is used for controlling power supply of the current measurement device.

Description

The converting equipment insulated on-line monitoring system

Technical field

The utility model relates to a kind of converting equipment insulated on-line monitoring system.

Background technology

At present, the experiment work of China's Substation Electric Equipment mainly is still according to the requirement of electrical equipment preventative " testing regulations " and regularly carries out preventive trial.Come the running status of judgment device according to the result of test, thereby determine whether it can continue to put into operation.Adhere to that for a long time preventive trial has played very large effect to the safe operation of China's electric system, but along with electric system high capacity, Towards Higher Voltage and structure complicated, along with the development of industrial and agricultural production, also more and more higher to the requirement of the safe reliability index of electric system.This traditional test and diagnostic method have seemed more inadaptable, and main manifestations needs to have a power failure at the trial, and the test period is long.Cause and send less electric weight and economic life to bring certain impact, this just is difficult to timely tracing trouble defective.Along with being in full swing of high-tension apparatus repair based on condition of component work, set up the system of a cover Real-Time Monitoring converting equipment running status, be very necessary for converting equipment state estimation, venture analysis, fault diagnosis, Strategies of Maintenance decision-making provide technical support.

Metal oxide arrester (being called for short MOA) is used widely in electric system because of its superior overvoltage protection characteristic; but the MOA resistor disc is aging and cause fault through being heated with the impact failure meeting; seriously may cause its blast; lightning arrester punctures also can cause the substation bus bar short circuit; affect system safety operation, therefore must carry out strictly effective detection and regularly preventive trial to operating MOA.In the detection and test of Zinc-Oxide Arrester, leakage current measurement under the ac operation voltage is an important project, and the size of the resistive current first harmonics composition in the leakage current can more accurately reflect the defectives such as Zinc-Oxide Arrester makes moist, the aging and built-in electrical insulation of valve block is impaired.Therefore, the parameters such as resistive leakage current first-harmonic being carried out Measurement accuracy just can differentiate the MOA performance comparatively exactly.

MOA testing current in resistance property application of installation frequency analysis technology detects the parameters such as resistive leakage current of operating MOA, and then judges the performance of MOA.Existing proving installation complex structure, this has affected the accuracy of MOA performance criteria and reliability.

The utility model content

Technical problem to be solved in the utility model provides a kind of converting equipment insulated on-line monitoring system, it is simple in structure, the resistive leakage current of high-precision MOA or capacitive apparatus be can obtain, and then accuracy and reliability to MOA or capacitive apparatus performance criteria improved; Simultaneously can be with the measurement result teletransmission.

For solving the problems of the technologies described above, the utility model provides a kind of converting equipment insulated on-line monitoring system, and it comprises: flush bonding processor, the touch-screen that links to each other with this flush bonding processor, network communication interface, a plurality of serial ports and relay; Described serial ports is connected with for the current measuring device of measuring MOA or capacitive apparatus leakage current; This current measuring device comprises: for the first mutual inductor of the leakage current signal that obtains MOA or capacitive apparatus, the second mutual inductor for the voltage signal that obtains electrical network, the synchronous ADC that links to each other with this first, second mutual inductor, the CPU that links to each other with this synchronous ADC, the communication module that links to each other with this CPU; Described CPU links to each other with flush bonding processor by described serial ports; Described relay is used for controlling the power supply of described current measuring device.

This converting equipment insulated on-line monitoring system also comprises voltage measuring apparatus; Described voltage measuring apparatus comprises: three detection modules of A, the B of the electrical network that is used for sampling respectively, the PT secondary voltage signal of C three-phase, each detection module comprises: the 3rd mutual inductor that is used for obtaining corresponding PT secondary voltage signal, the 4th mutual inductor for the voltage signal that obtains electrical network, the the second synchronous ADC that links to each other with the 3rd, the 4th mutual inductor, with the 2nd CPU that this second synchronous ADC links to each other, the second communication module that links to each other with the 2nd CPU.

Described the 2nd CPU is STM32 series A RM processor or single-chip microcomputer.

Described the second communication module is RS-485 and CAN bus communication module.Described RS-485 communication module adopts isolation RS-485 transceiver module.

Described synchronous ADC, the second synchronous ADC are made of 24 High Performance ADC converters, at a high speed and data output, single operating voltage, have that conversion accuracy is high, power consumption is extremely low, and analog input end has over-voltage protecting function.

With respect to prior art, good effect of the present utility model is: the course of work of the measurement mechanism of the resistive leakage current of (1) MOA of the present utility model or capacitive apparatus is digital measuring process, in measuring process, only need to carry out synchronized sampling to two tested same frequently periodic signals according to sample frequency fs, then carry out computing according to harmonic analysis method and initial phase angle equation, just can obtain two initial phase angle φ ₁And φ ₂, calculate at last their phase difference '.Do not need to add other hardware circuit in the measuring process, therefore digital realization can obtain high-precision resistive Leakage Current, and then improves accuracy and reliability to MOA or capacitive apparatus performance criteria.(2) converting equipment insulated on-line monitoring system of the present utility model is that a cover is for the power transformation high voltage electric equipment of 35kV above, implement the total solution of status monitoring and diagnosis, be adapted to monitor leakage current, current in resistance property and the movement counting of the end shield electric current of power transformer sleeve pipe in service, reactor, mutual inductor, coupling condenser and dielectric loss and electric capacity, lightning arrester and isoparametric monitoring actuation time and in the bus communication mode Monitoring Data be sent to collection control collecting unit in digital form.This monitoring system can independent self-organizing system also can with the integrated design of intelligent substation monitoring system, by Ethernet Monitoring Data is sent to integrated information platform, can be pooled to the Monitoring Data of several monitoring system of electric substation the data management diagnostic system on upper strata, realize the high voltage equipment insulation on-line monitoring system in many transformer stations is concentrated monitoring managing.The user utilizes LAN (Local Area Network) can obtain at any time the Monitoring Data result.

Description of drawings

Fig. 1 is the structured flowchart of converting equipment insulated on-line monitoring system of the present utility model;

Fig. 2 is the structured flowchart of the current measuring device of described measurement MOA or capacitive apparatus leakage current;

Fig. 3 is the structured flowchart of the voltage measuring apparatus of high voltage bus of the present utility model;

Fig. 4 is the structured flowchart of the detection module in the described voltage measuring apparatus.

Embodiment

Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.

As shown in Figure 1, the converting equipment insulated on-line monitoring system of the present embodiment comprises: flush bonding processor (ARM11), the touch-screen that links to each other with this flush bonding processor (preferred A56TFT resistive touch liquid crystal display), network communication interface (comprising: Ethernet, optical fiber interface),, keyboard and a plurality of serial ports and relay.

Described serial ports is connected with for the current measuring device of measuring MOA or capacitive apparatus leakage current; This current measuring device comprises: for the first mutual inductor of the leakage current signal that obtains MOA or capacitive apparatus, the second mutual inductor for the voltage signal that obtains electrical network, the synchronous ADC that links to each other with this first, second mutual inductor, the preferred STM32 series A of the CPU(RM processor that links to each other with this synchronous ADC), the communication module that links to each other with this CPU, this communication module comprises RS-485 communication module and CAN bus communication module, can also adopt the 3G wireless communication module, or the Wi-Fi wireless communication module; Parameters can be used the teletransmission of ModBus rtu protocol by RS-485 or CAN bus.

Described the second communication module is RS-485 and CAN bus communication module.

Described CPU links to each other with flush bonding processor by described serial ports with the 2nd CPU; Described relay is used for controlling the power supply of described current measuring device, voltage measuring apparatus.

Flush bonding processor uses ModBus agreement and described CPU and the 2nd CPU to carry out data communication, with 1,3,5,7,9,11,13, the 15 subharmonic amplitudes that read measured signal and the phase differential of each harmonic and civil power each harmonic.Flush bonding processor is according to the calculation of parameter current in resistance property, capacity current, resistive fundamental current, capacitive fundamental current, capacitance, resistance value, dielectric loss angle δ and the dielectric loss value tan δ that read.

Described on-line monitoring system can pass through Ethernet/optical fiber interface and use ModBusRTU teletransmission current in resistance property, capacity current, resistive fundamental current, capacitive fundamental current, capacitance, resistance value, dielectric loss angle δ and dielectric loss value tan δ data.

Two current sensors are transformed to voltage signal to tested current signal, then by the digitized measurement system signal are carried out integer-period sampled (ADC) and the accurate synchronously DFT of improvement type processing, obtain first-harmonic vector and the phase place angle thereof of these two signals.If do not consider the phase distortion problem of voltage transformer (VT) (PT), then can calculate easily the fundametal compoment peak I of the current in resistance property of the dielectric loss Tan δ value of capacitance type equipment Cx and lightning arrester equipment MOA _RPCompare with phase place zero passage relative method in the past, the great advantage of the method is not need complicated analog signal processing circuit, and the stability of long-term work is guaranteed, and can establishment harmonic wave disturbing effect.Actual measurement shows, even the harmonic signal content in the tested current signal is identical with first-harmonic content, also can not impact dielectric loss and current in resistance property result.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. a converting equipment insulated on-line monitoring system is characterized in that comprising: flush bonding processor, the touch-screen that links to each other with this flush bonding processor, network communication interface, a plurality of serial ports and relay;

Described serial ports is connected with for the current measuring device of measuring MOA or capacitive apparatus leakage current;

This current measuring device comprises: for the first mutual inductor of the leakage current signal that obtains MOA or capacitive apparatus, the second mutual inductor for the voltage signal that obtains electrical network, the synchronous ADC that links to each other with this first, second mutual inductor, the CPU that links to each other with this synchronous ADC, the communication module that links to each other with this CPU;

Described CPU links to each other with flush bonding processor by described serial ports;

Described relay is used for controlling the power supply of described current measuring device.

2. converting equipment insulated on-line monitoring system according to claim 1, it is characterized in that: this system also comprises voltage measuring apparatus;

Described voltage measuring apparatus comprises: three detection modules of A, the B of the electrical network that is used for sampling respectively, the PT secondary voltage signal of C three-phase, each detection module comprises: the 3rd mutual inductor that is used for obtaining corresponding PT secondary voltage signal, the 4th mutual inductor for the voltage signal that obtains electrical network, the the second synchronous ADC that links to each other with the 3rd, the 4th mutual inductor, with the 2nd CPU that this second synchronous ADC links to each other, the second communication module that links to each other with the 2nd CPU.