CN115494295A - Residual current monitoring system of low-voltage alternating current system for transformer substation - Google Patents
Residual current monitoring system of low-voltage alternating current system for transformer substation Download PDFInfo
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- CN115494295A CN115494295A CN202211314830.2A CN202211314830A CN115494295A CN 115494295 A CN115494295 A CN 115494295A CN 202211314830 A CN202211314830 A CN 202211314830A CN 115494295 A CN115494295 A CN 115494295A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a residual current monitoring system of a low-voltage alternating current system for a transformer substation, which comprises a current transformer, a residual current acquisition terminal and a residual current monitoring host, wherein the current transformer is sleeved on a low-voltage feeder for the substation, a secondary wire of the current transformer is connected with the residual current acquisition terminal, and the residual current acquisition terminal is connected with the residual current monitoring host through a communication bus. The problem of in transformer substation's headstock, the collection accuse cabinet because of same alternating current return circuit cable distributes more dispersedly, the more unable residual current monitoring that carries on of zero line cable is effectively solved.
Description
Technical Field
The invention relates to a current monitoring system, in particular to a residual current monitoring system of a low-voltage alternating current system for a substation.
Background
The transformer substation alternating current cable carries out residual current detection, and the method is an effective means capable of timely finding out cable insulation faults and preventing electrical fire. The measurement of present transformer substation's residual current and monitoring primary mode are patrolled and examined for manual handheld current clamp meter, to the more dispersed condition in same return circuit three-phase cable and zero line position, often need calculate behind the test three-phase alternating current alone, have subjective deviation, consuming time power, the calculated value deviation is great. And because the alternating current cables in most alternating current feeder cabinets, field power boxes and control cubicles of the transformer substations are distributed dispersedly at present, if a three-phase live wire of a certain loop is positioned at the lower end of an air switch at the upper part in the cabinet, and a zero line of the loop is connected to a zero line row at the bottom in the cabinet, or the loop is provided with two or more zero lines which return to the zero line row, the residual current of the loop cannot be monitored by using a clamp-on ammeter under the above conditions.
Disclosure of Invention
Aiming at the existing problems, the invention provides a residual current monitoring system of a low-voltage alternating current system for a transformer substation, which solves the problem that the residual current cannot be monitored when alternating current cables of the transformer substation are distributed dispersedly and more than one return circuit zero line is arranged.
The invention is realized by the following technical scheme:
the utility model provides a transformer substation station is with low pressure alternating current system residual current monitoring system, includes current transformer, residual current collection terminal and residual current monitoring host computer, the current transformer cover is on station is with low pressure feeder line, current transformer secondary line link to each other with residual current collection terminal, residual current collection terminal pass through communication bus and link to each other with residual current monitoring host computer.
The current transformer is an open type alternating current transformer which is respectively sleeved on an A phase line, a B phase line, a C phase line and an N zero line of the low-voltage feeder line for the station and is used for measuring the current of each phase line.
The current transformer converts the phase line currents into the phase line currents with the same proportion through a secondary line and accesses the residual current acquisition terminal interface.
The residual current collection terminal supports simultaneous monitoring of 16 current sampling values, the collection terminal performs signal processing and AD sampling on the received analog value, calculates the analog value to obtain a current effective value, and transmits the current effective value to the residual current monitoring display host through the communication bus.
The data acquisition terminal comprises a control module, a communication module, a power supply module, an internal clock module, a storage module, an AD conversion module and a data acquisition interface module, wherein the control module is respectively connected with the communication module, the power supply module, the internal clock module, the storage module, the AD conversion module and the data acquisition interface module.
And the residual current monitoring host machine performs vector summation on the current sampling value and then multiplies the current sampling value by a CT (computed tomography) proportionality coefficient to obtain the residual current value of the AC cable of the lighting loop so as to judge the insulation state of the cable of the loop.
And the residual current monitoring host displays the current value of the corresponding interface of the acquisition terminal and the calculated residual current value in real time.
The invention has the following advantages and effects:
the invention covers the current mutual inductor on each phase (zero) line of the low-voltage feeder line for the station respectively, which is used for measuring each phase (zero) current. And the current of each phase (line) converted into the same proportion is connected into an acquisition terminal interface through a secondary line. And each residual current acquisition terminal supports simultaneous monitoring of 16 current sampling values at most, and the acquisition terminals perform signal processing and AD sampling on the received analog values and then calculate to obtain current effective values. And transmitting the residual current to a residual current monitoring host through a communication bus. The residual current monitoring host machine carries out vector calculation corresponding to a plurality of current values to obtain and display the residual current values of the loops, and simultaneously displays the current values of all the loops, and can support the calculation of the residual current by adopting 16 current sampling values at most. The problem that residual current monitoring cannot be carried out on a large number of zero line cables due to the fact that the same alternating current loop cable is distributed in a power box and a control cubicle of a transformer substation in a dispersed mode is effectively solved; effectively preventing personal electric shock and electrical fire accidents.
Drawings
Fig. 1 is a schematic structural diagram of a residual current monitoring system of a low-voltage alternating current system for a substation.
In the figure, the device comprises a current transformer 1, a residual current acquisition terminal 2 and a residual current monitoring host 3.
Detailed Description
The invention is described below by way of specific embodiments with reference to the accompanying drawings.
The utility model provides a substation station is with low pressure alternating current system residual current monitoring system, includes current transformer 1, residual current collection terminal 2 and residual current monitoring host computer 3, current transformer be open type alternating current transformer, open type alternating current transformer overlaps respectively at station A phase line, B phase line, C phase line, the N zero line with the low pressure feeder for measure each phase line electric current. The secondary line of the current transformer is connected with a residual current acquisition terminal, the residual current acquisition terminal is connected with a monitoring host through a communication bus, and the residual current monitoring display host carries out vector summation on a current sampling value and then multiplies a CT (current transformer) proportionality coefficient to obtain the residual current value of the alternating current cable of the lighting circuit so as to judge the insulation state of the circuit cable; and the residual current monitoring host displays the current value of the corresponding interface of the acquisition terminal and the calculated residual current value in real time.
The current transformer converts the phase line currents into the phase line currents with the same proportion through a secondary line and accesses the residual current acquisition terminal interface.
The residual current collection terminal supports simultaneous monitoring of 16 current sampling values, the collection terminal performs signal processing and AD sampling on the received analog value, calculates the analog value to obtain a current effective value, and transmits the current effective value to the residual current monitoring display host through the communication bus.
The data acquisition terminal comprises a control module, a communication module, a power module, an internal clock module, a storage module, an AD conversion module and a data acquisition interface module, wherein the control module is respectively connected with the communication module, the power module, the internal clock module, the storage module, the AD conversion module and the data acquisition interface module.
As shown in fig. 1, taking the measurement of the residual current value of 1 lighting loop cable in the power box in the field as an example, the loop has A, B, C three phase lines and 2N phase zero lines in total. The method comprises the steps of selectively displaying 1, 2, 3, 4 and 5 loop currents on a monitoring display host to display and calculate residual currents, sleeving a 1 loop current transformer CT connected to a collection terminal on an A phase line below an air switch of the illumination loop, sleeving a 2 loop current transformer CT connected to the collection terminal on a B phase line below the air switch of the illumination loop, sleeving a 3 loop current transformer CT connected to the collection terminal on a C phase line below the air switch of the illumination loop, sleeving a 4 loop current transformer CT connected to the collection terminal on a first zero line of the illumination loop on a zero line row, and sleeving a 5 loop current transformer CT connected to the collection terminal on a second zero line of the illumination loop on the zero line row.
After current transformer gathered each phase line electric current, give residual current collection terminal through the secondary line transmission, residual current collection terminal obtains each phase line RMS after carrying out AD sampling, gives residual current monitoring host computer through the communication line transmission, residual current monitoring host computer is through carrying out vector summation to 1, 2, 3, 4, 5 way current sampling values after multiplying CT proportionality coefficient and obtaining this illumination return circuit alternating current cable residual current value for judge this return circuit cable insulation state, effectively prevent the person and electrocute and electric fire accident.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a substation is with low pressure alternating current system residual current monitoring system which characterized in that includes current transformer, residual current collection terminal and residual current monitoring host computer, and current transformer overlaps on the station is with low pressure feeder line, current transformer secondary line link to each other with residual current collection terminal, residual current collection terminal pass through communication bus and link to each other with residual current monitoring host computer.
2. The system for monitoring the residual current of the low-voltage alternating-current system for the transformer substation according to claim 1, characterized in that the current transformer is an open-type alternating-current transformer, and the open-type alternating-current transformer is respectively sleeved on a phase line A, a phase line B, a phase line C and a zero line N of a low-voltage feeder line for the substation and is used for measuring the current of each phase line.
3. The system for monitoring the residual current of the low-voltage alternating-current system for the substation according to claim 1, wherein the current transformer is used for converting the currents of the phases with the same proportion into currents through secondary lines and connecting the currents into a residual current collection terminal interface.
4. The system for monitoring the residual current of the low-voltage alternating-current system for the substation according to claim 1, wherein the residual current collection terminal supports simultaneous monitoring of 16 current sampling values, performs signal processing and AD sampling on a received analog value by the collection terminal, calculates the received analog value to obtain a current effective value, and transmits the current effective value to the residual current monitoring display host through a communication bus.
5. The system for monitoring the residual current of the low-voltage alternating-current system for the substation station according to claim 1, wherein the residual current collection terminal comprises a control module, a communication module, a power module, an internal clock module, a storage module, an AD conversion module and a data collection interface module, and the control module is respectively connected with the communication module, the power module, the internal clock module, the storage module, the AD conversion module and the data collection interface module.
6. The system for monitoring the residual current of the low-voltage alternating-current system for the substation according to claim 1, wherein the residual current monitoring host performs vector summation on current sampling values and then multiplies the current sampling values by a CT (computed tomography) proportionality coefficient to obtain the residual current value of the alternating-current cable of the lighting circuit so as to judge the insulation state of the alternating-current cable of the lighting circuit.
7. The low-voltage alternating-current system residual electricity for the substation station according to claim 1
The current monitoring system is characterized in that the residual current monitoring host displays the current value of the corresponding interface of the acquisition terminal and the calculated residual current value in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211314830.2A CN115494295A (en) | 2022-10-26 | 2022-10-26 | Residual current monitoring system of low-voltage alternating current system for transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211314830.2A CN115494295A (en) | 2022-10-26 | 2022-10-26 | Residual current monitoring system of low-voltage alternating current system for transformer substation |
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| CN115494295A true CN115494295A (en) | 2022-12-20 |
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| CN202211314830.2A Pending CN115494295A (en) | 2022-10-26 | 2022-10-26 | Residual current monitoring system of low-voltage alternating current system for transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115980439A (en) * | 2023-02-16 | 2023-04-18 | 深圳奥特迅电力设备股份有限公司 | Residual current detection device of distributed alternating current system |
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2022
- 2022-10-26 CN CN202211314830.2A patent/CN115494295A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115980439A (en) * | 2023-02-16 | 2023-04-18 | 深圳奥特迅电力设备股份有限公司 | Residual current detection device of distributed alternating current system |
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