CN201335864Y - Online insulation monitoring instrument for capacitive device - Google Patents
Online insulation monitoring instrument for capacitive device Download PDFInfo
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- CN201335864Y CN201335864Y CNU2008202307067U CN200820230706U CN201335864Y CN 201335864 Y CN201335864 Y CN 201335864Y CN U2008202307067 U CNU2008202307067 U CN U2008202307067U CN 200820230706 U CN200820230706 U CN 200820230706U CN 201335864 Y CN201335864 Y CN 201335864Y
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Abstract
The utility model discloses an online insulation monitoring instrument for a capacitive device, which comprises a current transformer, a voltage transformer, an analog input circuit, a central processing unit, a communication circuit and a monitoring host computer. The input end of the current transformer is used to connect the capacitive device to be detected. The input end of the voltage transformer is used to connect the PT device of a transformer. The output end of the current transformer and the output end of the voltage transformer are connected with the input end of the analog input circuit. The output end of the analogy input circuit is connected with the input end of the central processing unit. The communication port of the central processing unit is connected with the communication circuit. The other end of the communication circuit is connected with the monitoring host computer. The utility model has the advantages that the insulation condition of the capacitive device in the power system or the substation can be monitored in real time, the power is not required to be cut off, the workload is small, the insulation fault of the capacitive device can be predicted in time and an alarm is given to enable the relevant personnel to inspect and repair the device in time, and the safe operation of the substation is facilitated.
Description
Technical field
The utility model relates to a kind of on-line monitoring equipment of high voltage substation of electric system, especially a kind of on-line monitoring instrument that detects the state of insulation of capacitive apparatus.
Background technology
The safe operation of high-tension power transmission and transformation equipment is the key factor that influences power system security, stable and economical operation, and high voltage capacitive generation insulation fault not only can cause equipment damage itself, but also cause many-sided loss.Detection to these equipment at present mainly relies on preventive trial, and preventive trial is a kind of a kind of test that detects the state of insulation of capacitive apparatus that transformer station regularly does, and is used for detecting the electric capacity and the dielectric dissipation factor of capacitive apparatus.Relatively blindly, and both consuming time when this preventive trial detects, take a lot of work again, and transformer station must have a power failure, the transformer of a 220kV need stop an atmospheric electricity, the hundreds of thousands unit that then caused damage, this mode exists the cycle long, and workload is big, the shortcoming of inconvenience.
The utility model content
The purpose of this utility model provides a kind of capacitive apparatus insulated on-line monitoring instrument, can monitor the state of insulation of capacitive apparatus in real time, and the prevention insulation fault is simple and convenient, improves the safety and the reliability of electric system.
For achieving the above object, the utility model adopts following technical scheme: a kind of capacitive apparatus insulated on-line monitoring instrument, it is characterized in that: comprise current transformer and voltage transformer (VT), simulated measurement input circuit, CPU (central processing unit), communicating circuit and monitoring main frame, the input end of current transformer is used for connecting tested capacitive apparatus, the input end of voltage transformer (VT) is used for connecting transformer PT equipment, the output terminal of current transformer and voltage transformer (VT) is connected with the input end of simulated measurement input circuit, the output terminal of simulated measurement input circuit is connected with the input end of CPU (central processing unit), the communication port of CPU (central processing unit) is connected with communicating circuit, and the communicating circuit other end connects the monitoring main frame.
Also be connected with the electrical isolation circuit between described CPU (central processing unit) and the communicating circuit.
Described simulated measurement input circuit comprises signal condition filtering circuit and signal amplification circuit, and the output terminal of signal condition filtering circuit is connected with the input end of signal amplification circuit, and the output terminal of signal amplification circuit is connected with the input end of CPU (central processing unit).
Described signal condition filtering circuit is made of wave filter and peripheral circuit thereof, and the input end and the output terminal of wave filter are connected with toggle switch.
Described signal amplification circuit is made of amplifier and its peripheral circuit, and amplifier input terminal and output terminal are connected with toggle switch.
Described CPU (central processing unit) is the DSP digital processing unit, and the DSP digital processing unit also is connected with the FLASH memory circuit.
Described communicating circuit is a CAN bus communication circuit.
The capacitive apparatus insulated on-line monitoring instrument of the utility model can carry out real-time state monitoring to the insulation status of the capacitive apparatus in electric system or the transformer station, and insulation fault and the alarm that can in time predict the capacitive apparatus generation are in time overhauled the related personnel.When capacitive apparatus insulated on-line monitoring instrument carries out on-line monitoring, do not need to have a power failure, when having detected problem, carry out interruption maintenance again, workload is little, greatly reduces time between overhauls(TBO) and time, for the safe operation of transformer station provides convenience.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the signal condition filtering circuit schematic diagram in the simulated measurement input circuit;
Fig. 3 is the clock signal circuit figure of signal condition filtering circuit;
Fig. 4 is the signal amplification circuit schematic diagram in the simulated measurement input circuit;
Embodiment
As shown in Figure 1, the capacitive apparatus insulated on-line monitoring instrument of the utility model comprises current transformer and voltage transformer (VT), simulated measurement input circuit, DSP governor circuit, CAN bus communication circuit.Simulated measurement input circuit comprises signal condition filtering circuit and signal amplification circuit, and the DSP governor circuit comprises the FLASH memory circuitry that is connected on DSP digital processing unit and the DSP digital processing unit, and DSP digital processing unit inside is integrated with the A/D change-over circuit.The input end of current transformer is used for connecting the capacitive apparatus that will detect, the input end of voltage transformer (VT) is used for connecting transformer PT equipment, the output terminal of current transformer and voltage transformer (VT) is connected the input end of simulated measurement input circuit, it is the input end of signal condition filtering circuit, the output terminal of signal condition filtering circuit connects the input end of signal amplification circuit, the output terminal of signal amplification circuit is that the output terminal of simulated measurement input circuit is connected with the DSP governor circuit, the input end that is the A/D change-over circuit of DSP digital processing unit inside connects, the communication output port of DSP governor circuit also is connected with CAN bus communication circuit by the electrical isolation circuit, CAN bus communication circuit connects the monitoring main frame by the CAN bus, and the monitoring main frame is an industrial computer.
As shown in Figure 1, when detecting the state of insulation of capacitive apparatus in the present embodiment, capacitive apparatus inserts monitor by current transformer, and voltage transformer (VT) connects transformer PT equipment.The monitoring main frame is given the DSP digital processing unit by CAN bus mail message, and the used model of DSP digital processing unit is TMS320F2812 in the present embodiment, and after the DSP digital processing unit received signal, the passage that gating will detect detected.Current transformer current signal and the voltage signal (PT signal) of the voltage transformer (VT) input end that is input to simulated measurement input circuit, it is the input end of signal condition filtering circuit, simulated measurement input circuit adopts 6 road on-line data acquisition passages, gathers three-phase voltage U A, UB, UC and three-phase current IA, IB, IC.The input signal of simulated measurement input circuit carries out filtering by the signal condition filtering circuit, amplify via signal amplification circuit again, signal input DSP governor circuit after the amplification, treatment conversion through the A/D change-over circuit of DSP digital processing unit inside, after the analog signal conversion of voltage and current is digital signal, be stored in the FLASH storer, calculate these voltages and current signal via the DSP digital processor analyses, obtain the dielectric dissipation factor and the electric capacity size of capacitive apparatus, the DSP digital processing unit flows to the monitoring main frame with handled result by CAN bus communication circuit then.The monitor output that can come control figure I/O signal at the signal magnitude of input is simultaneously carried out the adjustment of enlargement factor and whether signal is nursed one's health Filtering Processing.In order to prevent that the interference on the CAN bus communication circuit from entering the DSP digital processing unit, the isolation that the electrical isolation circuit carries out communication signal is set between the output terminal of CAN bus communication circuit and DSP governor circuit, and used electrical isolation circuit is optocoupler H11L1 in the present embodiment.When monitor had detected problem, monitor sent alarm signal, and the related personnel sees the insulation status of institute's measurement equipment, in time overhauled processing.
As Fig. 2, Fig. 3 and shown in Figure 4, simulated measurement input circuit is made up of signal condition filtering circuit and signal amplification circuit.As shown in Figure 2, the signal condition filtering circuit is made up of low pass switching capacity filter MAX292EPA and peripheral circuit thereof, be connected with toggle switch S209 between the input end of low pass switching capacity filter MAX292EPA and output terminal, the output terminal of toggle switch S209 is connected with the rc filter circuit that capacitance resistance is formed.The clock signal of low pass switching capacity filter MAX292EPA is provided by function signal generator ICL8038 and peripheral circuit thereof, as shown in Figure 3.The output terminal of function signal generator ICL8038 is connected with diode D201, resistance R 257 and phase inverter 74ALS04.The output terminal of signal condition filtering circuit is connected with the input end of signal amplification circuit, as shown in Figure 4.Signal amplification circuit is made of high precision operating amplifier 0PA277 and peripheral circuit thereof, the output terminal of high precision operating amplifier 0PA277 and input end also are connected with toggle switch A103, also are connected with resistance R 122 and diode D107 between the input end of the input end of signal amplification circuit and high precision operating amplifier 0PA277.
Simulated measurement input circuit adopts 6 road on-line data acquisition passages, gathers three-phase voltage U A, UB, UC and three-phase current IA, IB, IC.Every road signal of gathering all will carry out filtering through the signal filtering modulate circuit, and signal amplification circuit amplifies.At this gatherer process with one road signal is the example explanation.As shown in Figure 2, the input end of a road detected signal input analog amount input circuit, be the input end IN_1 of signal condition filter amplification circuit, input end through resistance R 205 input low pass switching capacity filter MAX292EPA, MAX292EPA carries out filtering via the low pass switching capacity filter, some high-frequency interferencing signals of filtering.The toggle switch S209 that the input end of low pass switching capacity filter MAX292EPA is connected with output terminal is used for selecting signal whether to carry out filtering through low pass switching capacity filter MAX292EPA.After selecteed signal carries out filtering via low pass switching capacity filter MAX292EPA, after the further filtering of resistance-capacitance circuit that the output terminal of toggle switch S209 connects, insert the input end IN2_1 of signal amplification circuit again.As shown in Figure 3, the clock signal that function signal generator ICL8038 provides is adjusted clock waveform through diode D201, again through phase inverter 74LAS04, rising edge of clock signal and negative edge time are reduced greatly, import the clock signal input terminal of low pass switching capacity filter MAX292EPA afterwards.As shown in Figure 4, the input signal of signal amplification circuit has leached some high frequency interference on the clock signal through resistance R 122, diode D107, and signal is imported the input end of high precision operating amplifier OPA277 afterwards, carries out the processing and amplifying of signal.The input end of high precision operating amplifier OPA277 and output terminal are connected with toggle switch A103, are used for controlling the enlargement factor of amplifying signal.After high precision operating amplifier OPA277 carried out processing and amplifying to signal, from the output terminal output of high precision operating amplifier OPA277, this output signal flowed to the DSP digital processing unit and carries out treatment conversion.
Claims (7)
1. capacitive apparatus insulated on-line monitoring instrument, it is characterized in that: comprise current transformer and voltage transformer (VT), simulated measurement input circuit, CPU (central processing unit), communicating circuit and monitoring main frame, the input end of current transformer is used for connecting tested capacitive apparatus, the input end of voltage transformer (VT) is used for connecting transformer PT equipment, the output terminal of current transformer and voltage transformer (VT) is connected with the input end of simulated measurement input circuit, the output terminal of simulated measurement input circuit is connected with the input end of CPU (central processing unit), the communication port of CPU (central processing unit) is connected with communicating circuit, and the communicating circuit other end connects the monitoring main frame.
2. capacitive apparatus insulated on-line monitoring instrument according to claim 1 is characterized in that: also be connected with the electrical isolation circuit between described CPU (central processing unit) and the communicating circuit.
3. capacitive apparatus insulated on-line monitoring instrument according to claim 1 and 2, it is characterized in that: described simulated measurement input circuit comprises signal condition filtering circuit and signal amplification circuit, the output terminal of signal condition filtering circuit is connected with the input end of signal amplification circuit, and the output terminal of signal amplification circuit is connected with the input end of CPU (central processing unit).
4. capacitive apparatus insulated on-line monitoring instrument according to claim 3 is characterized in that: described signal condition filtering circuit is made of wave filter and peripheral circuit thereof, and the input end and the output terminal of wave filter are connected with toggle switch.
5. capacitive apparatus insulated on-line monitoring instrument according to claim 3 is characterized in that: described signal amplification circuit is made of amplifier and its peripheral circuit, and amplifier input terminal and output terminal are connected with toggle switch.
6. capacitive apparatus insulated on-line monitoring instrument according to claim 3 is characterized in that: described CPU (central processing unit) is the DSP digital processing unit, and the DSP digital processing unit also is connected with the FLASH memory circuit.
7. capacitive apparatus insulated on-line monitoring instrument according to claim 6 is characterized in that: described communicating circuit is a CAN bus communication circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202307067U CN201335864Y (en) | 2008-12-09 | 2008-12-09 | Online insulation monitoring instrument for capacitive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202307067U CN201335864Y (en) | 2008-12-09 | 2008-12-09 | Online insulation monitoring instrument for capacitive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201335864Y true CN201335864Y (en) | 2009-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202307067U Expired - Fee Related CN201335864Y (en) | 2008-12-09 | 2008-12-09 | Online insulation monitoring instrument for capacitive device |
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| CN (1) | CN201335864Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470963A (en) * | 2019-09-24 | 2019-11-19 | 云南电网有限责任公司红河供电局 | A kind of high voltage capacitive apparatus insulated performance on-line monitoring device based on DSP |
-
2008
- 2008-12-09 CN CNU2008202307067U patent/CN201335864Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470963A (en) * | 2019-09-24 | 2019-11-19 | 云南电网有限责任公司红河供电局 | A kind of high voltage capacitive apparatus insulated performance on-line monitoring device based on DSP |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20111209 |