CN112485581A - Zero sequence current transformer and secondary circuit detection device and method thereof - Google Patents
Zero sequence current transformer and secondary circuit detection device and method thereof Download PDFInfo
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- CN112485581A CN112485581A CN202011120771.6A CN202011120771A CN112485581A CN 112485581 A CN112485581 A CN 112485581A CN 202011120771 A CN202011120771 A CN 202011120771A CN 112485581 A CN112485581 A CN 112485581A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The invention provides a zero sequence current transformer and a secondary circuit detection device and method thereof, wherein the device comprises a current generation module, a current acquisition module, a microprocessor, a man-machine interaction module, an alarm module and a power supply module, wherein the current generation module is electrically connected with the zero sequence current transformer, and the current acquisition module is electrically connected with the zero sequence current transformer. The current generation module is used for outputting non-power frequency current which is far smaller than the zero sequence current protection fixed value to the zero sequence current transformer, the current collection module is used for collecting sampling current generated by the zero sequence current transformer, the microprocessor calculates the transformation ratio of the zero sequence current transformer and compares the calculation result with a set value, and when the calculation result is inconsistent with the set value, the current zero sequence current transformer has the defects of inaccurate transformation ratio, poor contact of a secondary circuit or open circuit and the like, so that the non-power-outage troubleshooting of abnormal hidden dangers of a zero sequence current sampling channel is realized, and the abnormal hidden dangers of the zero sequence current sampling channel are effectively detected.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a zero sequence current transformer and a secondary circuit detection device and method thereof.
Background
When the 10kV interval protection device is in normal operation, a zero-sequence current protection channel in the 10kV interval protection device has no current, and whether zero-sequence current sampling is abnormal or not cannot be monitored and early warned. When the zero sequence current sampling of the 10kV interval protection device is abnormal and a single-phase earth fault occurs, the interval zero sequence current protection is rejected, and the superior protection override action is tripped, so that the voltage loss of a 10kV bus, large-area power failure in a power supply area and the like are caused, and great economic loss and adverse social influence are brought. The abnormal hidden danger of the zero-sequence current sampling channel of the existing 10kV interval protection device of the transformer substation comprises two methods of power failure investigation and power failure investigation. When the inspection is carried out without power failure, the appearance of the device can only be inspected, and the inspection is carried out through fastening wiring, so that the abnormal hidden danger of the zero sequence current sampling channel is difficult to find; and the adoption of power failure investigation can cause power failure of users and influence the reliability of power supply.
Publication No. CN106908687A (published japanese 2017-06-30) proposes a current transformer secondary circuit detection device, which proposes that by combining with the output voltage of the rogowski coil to judge whether an open circuit is performed, the zero sequence current transformer can be checked without power outage. But because of the current 10kV interval zero sequence current protection constant value IdGenerally, the zero sequence current protection is set to be 60A-75A (primary value), so that the problem that the safe and reliable operation of a 10kV power distribution network is influenced due to the fact that false operation or operation failure operation is easily caused by zero sequence current protection exists.
Disclosure of Invention
The invention provides a zero sequence current transformer and a secondary circuit detection device thereof, and a zero sequence current transformer and a secondary circuit detection method thereof, aiming at overcoming the defects that the abnormal hidden danger of a zero sequence current sampling channel is difficult to find in the uninterrupted power supply troubleshooting and the misoperation or the operation rejection operation of zero sequence current protection is easy to cause in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a zero sequence current transformer and a secondary circuit detection device thereof comprise: current generation module, current acquisition module, microprocessor, human-computer interaction module, alarm module, power module, wherein: the output end of the current generation module is electrically connected with the input end of the zero sequence current transformer, and the input end of the current acquisition module is electrically connected with the output end of the zero sequence current transformer; the control end of the current generation module is connected with the output end of the microprocessor, the output end of the current acquisition module is connected with the input end of the microprocessor, and the output end of the microprocessor is respectively connected with the input end of the human-computer interaction module and the input end of the alarm module; the output end of the man-machine interaction module is connected with the input end of the microprocessor; the output end of the power supply module is respectively connected with the power supply ends of the current generation module, the current acquisition module, the microprocessor, the human-computer interaction module and the alarm module.
In the using process, the current generation module outputs non-power frequency current to the zero sequence current transformer, the output non-power frequency current is induced by the zero sequence current transformer to generate secondary current which is input into a secondary loop of the zero sequence current transformer, and the current acquisition module acquires the secondary current of the zero sequence current transformer in real time and then transmits the sampled current data to the microprocessor; the microprocessor carries out zero sequence current transformer transformation ratio calculation according to the output non-power frequency current value and the sampling current value, and sends the output non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module for display; and the microprocessor logically judges the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the defects of ratio-change misalignment, poor contact of a secondary circuit or open circuit and the like exist in the current zero-sequence current transformer, the microprocessor sends an alarm signal to the alarm module, the alarm module works and gives an alarm, and the microprocessor controls the current generation module to stop working.
As the preferred scheme, the sampling current output by the current generation module is 2 times of power frequency current, namely 100Hz current.
As a preferred scheme, the device further comprises an output current limiting circuit, wherein the input end of the output current limiting circuit is electrically connected with the output end of the current generation module, and the output end of the output current limiting circuit is electrically connected with the input end of the zero sequence current transformer. The output current limiting circuit is used for enabling the sampling current value generated by the current generation module to be far smaller than the fixed value of the zero sequence current protection, and avoiding the malfunction of the zero sequence current protection when the zero sequence current transformer rises.
As a preferred scheme, the current acquisition module comprises a current clamp, and the device acquires the secondary current of the zero sequence current transformer through the current clamp.
As a preferred scheme, the sampling relative error of the current acquisition module is less than or equal to 0.5 percent, and the measuring range is 0-20A.
As a preferred scheme, the device further comprises a current terminal, wherein the current terminal is arranged in the switch cabinet and is connected with the zero sequence current transformer through a pre-installed boost line; the output end of the current generation module is connected with the current terminal through the test current rising line.
As a preferred scheme, the device also comprises a storage module, wherein the input end of the storage module is connected with the output end of the microprocessor; the microprocessor sends the current sampling current value and the detection result to the storage module, and when a worker sends an inquiry operation instruction to the microprocessor through the human-computer interaction module, the microprocessor calls the history detection through the storage module and then sends the history detection to the human-computer interaction module for displaying.
As a preferred scheme, the device further comprises a communication module, the input end of the communication module is connected with the output end of the microprocessor, and the microprocessor sends the detection result and the current sampling current value to the terminal of a worker through the communication module.
Preferably, the human-computer interaction module comprises a liquid crystal touch screen.
The invention also provides a zero sequence current transformer and a secondary circuit detection method thereof, which are applied to the zero sequence current transformer and the secondary circuit detection device thereof in any technical scheme, and specifically comprise the following steps:
s1: electrically connecting the output end of the current generation module with the zero sequence current transformer, and electrically connecting the input end of the current acquisition module with the zero sequence current transformer and a secondary circuit thereof to complete the installation of the detection device;
s2: the current generation module outputs non-power frequency current to the zero sequence current transformer, the non-power frequency current is induced by the zero sequence current transformer to generate secondary current which is input into a secondary loop of the zero sequence current transformer, and the current acquisition module acquires the secondary current generated by the zero sequence current transformer in real time and then transmits the sampled current data to the microprocessor;
s3: the microprocessor carries out zero-sequence current transformer transformation ratio calculation according to the non-power frequency current value and the sampling current value, and sends the output non-power frequency current value, the secondary current value and the calculation result to the human-computer interaction module for display;
s4: and the microprocessor carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the microprocessor sends an alarm signal to the alarm module, the alarm module works and gives an alarm, and the microprocessor controls the current generation module to stop working.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention realizes the current rise test of the zero sequence current transformer by outputting non-power frequency current which is far smaller than the zero sequence current protection fixed value to the zero sequence current transformer, and the invention is matched with the current acquisition module and the microprocessor to acquire and calculate the secondary current of the zero sequence current transformer, compares the calculation result with the set value, realizes the uninterrupted intelligent detection of the zero sequence current transformer and the secondary loop thereof, effectively detects the abnormal hidden trouble of the zero sequence current sampling channel, simultaneously ensures that the false operation or the operation rejection of the zero sequence current protection can not be caused, ensures the safe and reliable operation of a 10kV power distribution network, and improves the power supply reliability.
Drawings
Fig. 1 is a schematic structural diagram of a zero sequence current transformer and a secondary circuit detection device thereof in embodiment 1.
Fig. 2 is a wiring reference diagram of the zero sequence current transformer and the secondary circuit detection device thereof in embodiment 1.
Fig. 3 is a schematic structural diagram of the zero sequence current transformer and the secondary circuit detection device thereof in embodiment 2.
Fig. 4 is a wiring reference diagram of the zero sequence current transformer and the secondary circuit detection device thereof in embodiment 2.
Fig. 5 is a flowchart of the zero sequence current transformer and the secondary circuit detection method thereof in embodiment 3.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a zero sequence current transformer and a secondary circuit detection device thereof, as shown in fig. 1, which is a schematic structural diagram of the zero sequence current transformer and the secondary circuit detection device thereof of the present embodiment.
The zero sequence current transformer and the secondary loop detection device thereof provided by the embodiment comprise a current generation module 1, a current collection module 2, a microprocessor 3, a man-machine interaction module 4, an alarm module 5 and a power supply module 6, wherein the output end of the current generation module 1 is electrically connected with the input end of the zero sequence current transformer, and the input end of the current collection module 2 is electrically connected with the output end of the zero sequence current transformer; the control end of the current generation module 1 is connected with the output end of the microprocessor 3, the output end of the current collection module 2 is connected with the input end of the microprocessor 3, and the output end of the microprocessor 3 is respectively connected with the input end of the human-computer interaction module 4 and the input end of the alarm module 5; the output end of the man-machine interaction module 4 is connected with the input end of the microprocessor 3.
The output end of the power supply module 6 is respectively connected with the power supply ends of the current generation module 1, the current acquisition module 2, the microprocessor 3, the human-computer interaction module 4 and the alarm module 5. The power module in this embodiment adopts a storage battery or a lithium battery pack.
Fig. 2 is a reference diagram of the connection of the zero sequence current transformer and the secondary circuit detection apparatus thereof according to this embodiment. Wherein the zero sequence current transformer is generally installed at 10kV intervals of a 10kV primary cable layer.
Further, the non-power frequency current output by the current generation module 1 in this embodiment is 2 times of the power frequency current, that is, 100Hz current.
Further, the current collection module 2 comprises a current clamp, the device collects the secondary current of the zero sequence current transformer through the current clamp, the sampling relative error is less than or equal to 0.5%, and the measuring range is 0-20A.
Further, the human-computer interaction module 4 comprises a liquid crystal touch screen. In the using process, a worker can set a current output value which is smaller than 15A at will through the human-computer interaction module 4, the human-computer interaction module 4 converts a received working instruction into a working signal and sends the working signal to the microprocessor 3, the microprocessor 3 sends the working signal to the current generation module 1, and the current generation module 1 is controlled to output a non-power frequency current with a corresponding size.
Further, the present embodiment further includes an output current limiting circuit, an input end of the output current limiting circuit is electrically connected to an output end of the current generating module 1, and an output end of the output current limiting circuit is electrically connected to an input end of the zero sequence current transformer. The output current-limiting circuit is configured to enable a non-power-frequency current value generated by the current generation module 1 to be much smaller than a fixed value of zero-sequence current protection, and in this embodiment, the output current-limiting circuit limits the output non-power-frequency current to a current output value smaller than 15A.
Current 10kV interval zero sequence current protection constant value IdThe value is generally set to be 60A-75A (primary value), a zero sequence current protection sampling module of the 10kV protection device is generally configured with a filtering function, and only a power frequency current value is collected to serve as an amplitude criterion of zero sequence current protection. Therefore, the detecting device proposed in this embodimentThe current-limiting output which outputs 2 times of power frequency current and is far smaller than the zero sequence current protection constant value can effectively avoid the malfunction of the zero sequence current protection when the zero sequence current transformer rises.
In the specific implementation process, the current generation module 1 outputs non-power frequency current to the zero sequence current transformer, wherein the non-power frequency current is 2 times of power frequency current, namely 100Hz current, and the output current limiting circuit connected with the output end of the current generation module 1 realizes the current limiting function, so that the non-power frequency current is smaller than the current output value of 15A.
The non-power frequency current output by the current generation module 1 is induced by the zero sequence current transformer to generate a secondary current which is input into a secondary loop of the current generation module, the current acquisition module 2 acquires the secondary current of the zero sequence current transformer in real time and then transmits the acquired current data to the microprocessor 3; the microprocessor 3 carries out zero sequence current transformer transformation ratio calculation according to the output non-power frequency current value and the sampling current value, and sends the output non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module 4 for display. Meanwhile, the microprocessor 3 carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the defects of misalignment of transformation ratio, poor contact of a secondary circuit or open circuit and the like exist in the current zero-sequence current transformer, at the moment, the microprocessor 3 sends an alarm signal to the alarm module 5, the alarm module 5 works and gives an alarm, a power transformation operation department can conveniently arrange defect elimination in time, and potential safety hazards are eliminated; and the microprocessor 3 controls the current generation module 1 to stop working, so that the safe and reliable work of the zero sequence current transformer in the current rise without power failure is ensured.
Example 2
The embodiment is an improvement on the zero sequence current transformer and the secondary circuit detection device thereof provided in embodiment 1. Fig. 3 is a schematic structural diagram of the zero sequence current transformer and the secondary circuit detection apparatus thereof according to this embodiment.
The zero sequence current transformer and the secondary circuit detection device thereof in the embodiment further comprise a storage module 7, wherein the input end of the storage module 7 is connected with the output end of the microprocessor 3; the microprocessor 3 sends the currently acquired secondary current value and the detection result to the storage module 7.
When the staff sends an inquiry operation instruction to the microprocessor 3 through the human-computer interaction module 4, the microprocessor 3 calls the history detection through the storage module 7 and then sends the history detection to the human-computer interaction module 4 for display.
The zero sequence current transformer and the secondary circuit detection device thereof in the embodiment further comprise a current terminal 8, when the zero sequence current transformer is installed in the switch cabinet at an interval of 10kV, the current terminal 8 is arranged on the switch cabinet, the zero sequence current transformer is led out into the switch cabinet through a pre-installed boost line and is connected with the current terminal 8, and when the zero sequence current transformer is used, the output end of the current generation module 1 is connected with the current terminal 8 through an output test boost line, so that the connection and installation of the detection device and the current transformer are completed.
Fig. 4 is a reference diagram of the connection of the zero sequence current transformer and the secondary circuit detection apparatus thereof according to this embodiment. The zero sequence current transformer is connected with one end of the current terminal 8 through a pre-installed boost line, and the output end of the current generation module 1 is connected with the other end of the current terminal 8 through a test boost line.
The zero sequence current transformer and the secondary circuit detection device thereof in the embodiment further comprise a communication module 9, the input end of the communication module 9 is connected with the output end of the microprocessor 3, and the microprocessor 3 sends the detection result and the currently acquired secondary current value to the terminal of the worker through the communication module 9.
In the specific implementation process, the current generation module 1 outputs 2 times of power frequency current as sampling current, the sampling current is induced by the zero sequence current transformer to generate secondary current, the secondary current is input into a secondary loop of the sampling current, the current acquisition module 2 acquires the secondary current of the zero sequence current transformer in real time, and then current data acquired by the current acquisition module is sent to the microprocessor 3; the microprocessor 3 carries out zero sequence current transformer transformation ratio calculation according to the output sampling current value and the acquired secondary current value, and sends the output non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module 4 for display and to the storage module 7 for storage by taking the sampling time as a label.
Meanwhile, the microprocessor 3 carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the defects of ratio misalignment, poor contact of a secondary circuit or open circuit and the like exist in the current zero-sequence current transformer, at the moment, the microprocessor 3 sends an alarm signal to the alarm module 5, the alarm module 5 works and gives an alarm, and the microprocessor 3 controls the current generation module 1 to stop working; in addition, the microprocessor 3 sends the output non-power frequency current value, the sampling current value, the calculation result and the judgment result to a staff terminal through the communication module 9, and staff can obtain the detection result of the current zero sequence current transformer and a secondary circuit thereof through the terminal of the staff, so that a transformer operation department can conveniently arrange defect elimination in time and eliminate potential safety hazards.
Example 3
The present embodiment provides a zero sequence current transformer and a secondary circuit detection method thereof, which are applied to the zero sequence current transformer and the secondary circuit detection device thereof provided in embodiment 1 or embodiment 2. Fig. 5 is a flowchart of the zero sequence current transformer and the secondary circuit detection method thereof according to this embodiment.
The zero sequence current transformer and the secondary circuit detection method thereof provided by the embodiment comprise the following steps:
s1: the output end of the current generation module 1 is electrically connected with the zero sequence current transformer, and the input end of the current acquisition module 2 is electrically connected with the zero sequence current transformer and a secondary circuit thereof, so that the installation of the detection device is completed;
s2: the current generation module 1 outputs sampling current to the zero sequence current transformer, the sampling current is induced by the zero sequence current transformer to generate secondary current, the secondary current is input into a secondary loop of the zero sequence current transformer, the current acquisition module 2 acquires the secondary current generated by the zero sequence current transformer in real time, and then secondary current data acquired by the current acquisition module is sent to the microprocessor 3;
s3: the microprocessor 3 carries out zero sequence current transformer transformation ratio calculation according to the output non-power frequency current value and the collected secondary current value, and sends the non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module 4 for display;
s4: the microprocessor 3 carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the microprocessor 3 sends an alarm signal to the alarm module 5, the alarm module 5 works and gives an alarm, and the microprocessor 3 controls the current generation module 1 to stop working.
In this embodiment, the zero sequence current transformer and the secondary circuit detection device thereof provided in embodiment 1 or embodiment 2 are applied to perform intelligent detection of the zero sequence current transformer and the secondary circuit thereof, so that defects such as misalignment of the transformation ratio of the zero sequence current transformer, poor contact of the secondary circuit or open circuit can be timely and effectively detected, timely arrangement and maintenance of a power transformation operation department are facilitated, influence on power consumption of a user is avoided, and potential safety hazards are effectively eliminated.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a zero sequence current transformer and secondary circuit detection device thereof which characterized in that, includes that current generation module, current acquisition module, microprocessor, human-computer interaction module, alarm module, power module, wherein:
the output end of the current generation module is electrically connected with the input end of the zero sequence current transformer, and the input end of the current acquisition module is electrically connected with the output end of the zero sequence current transformer;
the control end of the current generation module is connected with the output end of the microprocessor, the output end of the current collection module is connected with the input end of the microprocessor, and the output end of the microprocessor is respectively connected with the input end of the human-computer interaction module and the input end of the alarm module;
the output end of the human-computer interaction module is connected with the input end of the microprocessor;
the output end of the power supply module is respectively connected with the power supply ends of the current generation module, the current acquisition module, the microprocessor, the human-computer interaction module and the alarm module;
the current generation module outputs non-power frequency current to the zero sequence current transformer, the non-power frequency current is induced by the zero sequence current transformer to generate secondary current which is input into a secondary loop of the zero sequence current transformer, and the current acquisition module acquires the secondary current of the zero sequence current transformer in real time and then transmits the sampled current data to the microprocessor; the microprocessor carries out zero sequence current transformer transformation ratio calculation according to the output non-power frequency current value and the sampling current value, and sends the output non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module for display; and the microprocessor carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the microprocessor sends an alarm signal to an alarm module, the alarm module works and gives an alarm, and the microprocessor controls the current generation module to stop working.
2. The zero sequence current transformer and the secondary circuit detection device thereof according to claim 1, wherein the sampling current outputted by the current generation module is 2 times of power frequency current.
3. The zero sequence current transformer and the secondary loop detection device thereof according to claim 1, further comprising an output current limiting circuit, wherein an input end of the output current limiting circuit is electrically connected to an output end of the current generation module, and an output end of the output current limiting circuit is electrically connected to an input end of the zero sequence current transformer.
4. The zero sequence current transformer and the secondary circuit detection device thereof as claimed in claim 1, wherein the current collection module comprises a current clamp, and the device collects the secondary current of the zero sequence current transformer through the current clamp.
5. The zero sequence current transformer and the secondary circuit detection device thereof as claimed in claim 4, wherein the sampling relative error of the current collection module is less than or equal to 0.5%, and the range is 0-20A.
6. The zero sequence current transformer and the secondary circuit detection device thereof as claimed in claim 1, further comprising current terminals disposed in the switch cabinet and connected with the zero sequence current transformer through a pre-installed boost line; and the output end of the current generation module is connected with a current terminal through a test current rising line.
7. The zero sequence current transformer and the secondary circuit detection device thereof according to claim 1, further comprising a storage module, wherein an input end of the storage module is connected with an output end of the microprocessor; the microprocessor sends the current sampling current value and the detection result to the storage module, and when a worker sends an inquiry operation instruction to the microprocessor through the human-computer interaction module, the microprocessor calls the history detection through the storage module and then sends the history detection to the human-computer interaction module for displaying.
8. The zero sequence current transformer and the secondary circuit detection device thereof according to claim 8, further comprising a communication module, wherein an input end of the communication module is connected with an output end of the microprocessor, and the microprocessor sends the detection result and the current sampling current value to a terminal of a worker through the communication module.
9. The zero sequence current transformer and the secondary circuit detection device thereof according to any one of claims 1 to 8, wherein the human-computer interaction module comprises a liquid crystal touch screen.
10. A zero sequence current transformer and a secondary circuit detection method thereof, which are applied to the zero sequence current transformer and the secondary circuit detection device thereof of any one of claims 1 to 9, characterized by comprising the following steps:
s1: electrically connecting the output end of the current generation module with a zero sequence current transformer, and electrically connecting the input end of the current acquisition module with the zero sequence current transformer and a secondary circuit thereof to complete the installation of the detection device;
s2: the current generation module outputs non-power frequency current to the zero sequence current transformer, the non-power frequency current is induced by the zero sequence current transformer to generate secondary current which is input into a secondary loop of the zero sequence current transformer, the current acquisition module acquires the secondary current of the zero sequence current transformer in real time and then transmits the acquired secondary current data to the microprocessor;
s3: the microprocessor carries out zero sequence current transformer transformation ratio calculation according to the output non-power frequency current value and the acquired secondary current value, and sends the non-power frequency current value, the sampling current value and the calculation result to the human-computer interaction module for display;
s4: and the microprocessor carries out logic judgment on the calculation result and a preset set value thereof, when the calculation result is inconsistent with the set value, the microprocessor sends an alarm signal to an alarm module, the alarm module works and gives an alarm, and the microprocessor controls the current generation module to stop working.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552434A (en) * | 2021-07-21 | 2021-10-26 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Oil-immersed current transformer low-temperature characteristic research system based on expert comprehensive judgment |
| CN113640702A (en) * | 2021-09-02 | 2021-11-12 | 广东电网有限责任公司 | Zero sequence protection device and method with current loop self-checking function |
| CN114167309A (en) * | 2021-10-28 | 2022-03-11 | 国网江苏省电力有限公司连云港供电分公司 | Zero sequence current transformer secondary circuit broken line detection device and method |
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| CN106645931A (en) * | 2016-11-29 | 2017-05-10 | 国网四川省电力公司电力科学研究院 | Current transformer secondary circuit monitoring module and method, and specific transformer acquiring terminal |
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| CN113552434B (en) * | 2021-07-21 | 2022-06-24 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Oil-immersed current transformer low-temperature characteristic research system based on expert comprehensive judgment |
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Application publication date: 20210312 |