CN112165073A - Current transformer secondary circuit open-circuit protection device and method - Google Patents
Current transformer secondary circuit open-circuit protection device and method Download PDFInfo
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- CN112165073A CN112165073A CN202011145024.8A CN202011145024A CN112165073A CN 112165073 A CN112165073 A CN 112165073A CN 202011145024 A CN202011145024 A CN 202011145024A CN 112165073 A CN112165073 A CN 112165073A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/042—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for current transformers
Abstract
The invention discloses a current transformer secondary circuit open-circuit protection device and a method, which comprises a shell, a monitoring module, a relay and a voltage sensor, wherein the monitoring module, the relay and the voltage sensor are packaged in the shell, a contact of the relay and the voltage sensor are connected on the secondary circuit in parallel, the signal input end of the monitoring module is connected with a signal wire of the voltage sensor, and the high-level output end of the monitoring module is connected with a coil of the relay. According to the invention, elements such as a monitoring module and a relay are packaged in a shell, a voltage sensor, the relay and the like are connected in parallel on a secondary circuit inside, once the monitoring module finds that the secondary circuit is open, a relay contact is triggered to be closed, and a protection device similar to an air switch is obtained; the device is opposite to the principle of the air switch, the air switch is disconnected when the loop is short-circuited, and the device is short-circuited when the secondary loop is disconnected.
Description
Technical Field
The invention relates to the field of electrical equipment protection, in particular to a current transformer secondary circuit open-circuit protection device and method.
Background
The current transformer is a device for converting large current of a power system into small current, and secondary side current of the current transformer is used for functions of protection, measurement, metering and the like. When the current transformer normally operates, the load impedance load of the secondary side of the current transformer is small, the current transformer is similar to a short-circuit state, and the secondary voltage is low; when the secondary loop is open-circuited, the current transformer is very easy to enter an electromagnetic saturation state, high voltage (up to ten thousand volts) is induced on the secondary side, adjacent secondary equipment can be burnt, and primary equipment can be heated, burnt and even exploded. According to the accident report of the power industry, the secondary circuit open circuit accident of the current transformer is frequent, so that heavy losses are often caused, and the safety of people, a power grid and equipment is seriously threatened.
At present, the existing current transformer protection device is directly connected in series on a secondary circuit, and although the current transformer secondary circuit can play a role in circuit protection when an open circuit fault occurs, certain loss power consumption is brought when the secondary circuit normally works, and an additional open circuit risk is increased.
Disclosure of Invention
The invention provides a current transformer secondary circuit open-circuit protection device and a method.
The invention is realized by the following technical scheme:
a secondary circuit open circuit protection device of a current transformer comprises a shell, a monitoring module, a relay and a voltage sensor, wherein the monitoring module, the relay and the voltage sensor are packaged in the shell;
two sets of wiring ports are arranged on the surface of the shell, wherein,
the port A1, the port B1, the port C1, the port N1 and the port D1 are arranged at the top of the shell, fastening screws are arranged on the front face of the shell corresponding to the ports, and the port A1, the port B1, the port C1 and the port N1 are used for connecting three phase lines of a secondary circuit of the current transformer into the shell;
the port A2, the port B2, the port C2, the port N2 and the port D2 are arranged at the bottom of the shell, fastening screws are arranged on the front face of the shell corresponding to the ports, and the port A2, the port B2, the port C2 and the port N2 are used for connecting a load into a secondary circuit through the shell;
port D1 and port D2 are ports for connecting the monitoring module with external devices;
the secondary loop includes the internal conductors of port a1 to port a2, port B1 to port B2, port C1 to port C2, and port N1 to port N2.
And the port A1, the port B1, the port C1 and the port N1 are provided with Hall current sensors, the Hall current sensors are connected with a second signal input end of the monitoring module, the Hall current sensors are used for monitoring secondary loop current, and the monitoring module is used for monitoring secondary loop voltage and receiving current signals of the Hall current sensors and judging an open-circuit state.
On the basis of the scheme, the method further comprises the following steps. The monitoring module includes:
a receiving unit: the device comprises a voltage sensor, a Hall current sensor, a voltage sampling value and a current sampling value, wherein the voltage sensor is used for receiving a voltage sampling value input by the voltage sensor and a current sampling value input by the Hall current sensor;
an analysis unit: the device is used for analyzing and judging a voltage sampling value input by the voltage sensor and a current sampling value input by the Hall current sensor;
a storage unit: the abnormal data storage unit is used for storing the abnormal data judged by the analysis unit;
a transmission unit: for outputting the control signal sent by the analyzing unit.
The contact of the relay is in a normally open state, and when the monitoring module monitors that the secondary circuit is open, the coil of the relay is controlled to trigger the contact to be closed.
The utility model discloses a monitoring module, including shell, monitoring module, port D1 and port D2, the shell surface is provided with between the lower row of fastening screw and reports to the police pilot lamp, report to the police pilot lamp and be connected with monitoring module's alarm signal output, monitoring module's alarm signal output still is connected to the radio signal transmitter through port D1 and port D2, sends alarm signal to regulation and control center.
On the basis of the scheme, the method further comprises the following steps: still be provided with manual start button and manual reset button between the terminal of row from top to bottom on the shell surface, manual start button and manual reset button all with relay contact lug connection, light when alarm indicator, on-the-spot fortune dimension personnel can the switching of manual control relay, overhaul the running state in secondary circuit as early as possible.
The back of the shell is provided with a clamping groove, and the shell can be installed on a terminal block on the field terminal box through the clamping groove.
A method for protecting the open circuit of the secondary circuit of a current transformer is characterized in that the method is applied to the open circuit protection device of the secondary circuit of the current transformer and comprises the following steps:
s1: the voltage sensor monitors the voltage of the secondary loop, and the Hall current sensor monitors the current of the secondary loop;
s2: the monitoring module receiving unit receives sampling data of the voltage sensor and the Hall current sensor;
s3: the monitoring module analysis unit respectively carries out threshold value judgment on a voltage sampling value input by the voltage sensor and a current sampling value input by the Hall current sensor, when any sampling value is larger than a threshold value, the sampling value is judged to be abnormal data, S3 is executed, otherwise, the next group of data is continuously processed;
s4: the monitoring module sending unit outputs an alarm signal and stores data in the storage unit;
s5: the alarm signal is transmitted to an alarm indicator light, and the alarm indicator light is on;
s6: the monitoring module analysis unit carries out AND logic judgment on the states of the voltage sampling value and the current sampling value obtained after threshold judgment, S7 is executed when the two sampling values are abnormal data, and otherwise, the next group of data is processed continuously;
s7: the monitoring module judges that the secondary circuit is in an open circuit state, and the sending unit outputs a high level signal;
s8: and the high-level signal is transmitted to the relay coil to trigger the relay contact to be closed, so that the secondary loop is short-circuited.
After step S5, there are further: the relay contact can be manually closed through a manual reset button, and the secondary circuit is in short circuit; after the inspection is finished, the relay contact can be opened through the manual starting button, and the working state of the secondary circuit is recovered.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention encapsulates the monitoring module, the relay and other elements in a shell, and internally connects the voltage sensor, the relay and the like in parallel on the secondary loop, thereby not influencing the electrical relation on the secondary loop, and the device does not need to modify the fixed value matching with the devices such as protection, measurement and control and the like after being connected. Once the monitoring module finds that the secondary circuit is open, the relay contact is triggered to be closed, and a protection device similar to an air switch is obtained; the device is opposite to the principle of the air switch, the air switch is disconnected when the loop is short-circuited, and the device is short-circuited when the secondary loop is disconnected.
2. According to the invention, through comprehensive analysis of the abnormal conditions of the voltage and current parameters, different response strategies are made for single-data abnormality and double-data abnormality, and the misjudgment probability of open-circuit protection is reduced.
3. According to the invention, the Hall current sensor is skillfully arranged on the circuit main line channel on the shell, non-contact data sampling is realized through the high-precision Hall current sensor, a current transmission link is not increased, and an additional open-circuit risk is not increased.
4. The invention can simultaneously carry out on-site alarm and remote alarm on the abnormal state and remind the operation and maintenance personnel to check the loop in time.
Drawings
A further understanding of the embodiments of the present invention may be obtained from the following claims of the invention and the following description of the preferred embodiments when taken in conjunction with the accompanying drawings. Individual features of the different embodiments shown in the figures may be combined in any desired manner in this case without going beyond the scope of the invention. In the drawings:
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a schematic diagram of a package structure of the present invention;
fig. 5 is an installation view of the present invention.
Description of reference numerals: 1-manual start button, 2-manual reset button, 3-alarm indicator light, 4-Hall current sensor, 5-card slot, 6-shell, 7-field terminal box, 8-first terminal row, 9-second terminal row, 10-relay, 11-current transformer, 12-load, 13-voltage sensor, 14-monitoring module.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 4, in the present scheme, an open circuit protection device for a secondary circuit of a current transformer 11 includes a housing 6, a monitoring module 14, a relay 10 and a voltage sensor 13, the monitoring module 14, the relay 10 and the voltage sensor 13 are packaged in the housing 6, contacts of the relay 10 and the voltage sensor 13 are all connected in parallel on the secondary circuit, a signal input end of the monitoring module 14 is connected to a signal line of the voltage sensor 13, and a high level output end of the monitoring module 14 is connected to a coil of the relay 10;
the surface of the housing 6 is provided with two sets of wiring ports, wherein,
as shown in fig. 1, 2 and 3, the port a1, the port B1, the port C1, the port N1 and the port D1 are arranged at the top of the housing 6, fastening screws are arranged at the front of the housing 6 corresponding to the ports, and the port a1, the port B1, the port C1 and the port N1 are ports for connecting three phase lines of a secondary circuit of the current transformer 11 to the housing 6;
a port a2, a port B2, a port C2, a port N2 and a port D2 are provided at the bottom of the housing 6, fastening screws are provided at the front surface of the housing 6 corresponding to the respective ports, and the port a2, the port B2, the port C2 and the port N2 are ports for connecting the load 12 to the secondary circuit through the housing 6;
port D1 and port D2 are ports for connecting the monitoring module 14 with external devices;
the secondary loop includes the internal conductors of port a1 to port a2, port B1 to port B2, port C1 to port C2, and port N1 to port N2.
The port A1, the port B1, the port C1 and the port N1 are provided with Hall current sensors 4, the Hall current sensors 4 are connected with a second signal input end of the monitoring module 14, the Hall current sensors 4 are used for monitoring secondary loop current, and the monitoring module 14 is used for monitoring secondary loop voltage and receiving current signals of the Hall current sensors 4 and judging an open-circuit state.
Preferably, the monitoring module 14 includes:
a receiving unit: the device is used for receiving a voltage sampling value input by the voltage sensor 13 and a current sampling value input by the Hall current sensor 4;
an analysis unit: the device is used for analyzing and judging a voltage sampling value input by the voltage sensor 13 and a current sampling value input by the Hall current sensor 4;
a storage unit: the abnormal data storage unit is used for storing the abnormal data judged by the analysis unit;
a transmission unit: for outputting the control signal sent by the analyzing unit.
The contacts of the relay 10 are normally open, and when the monitoring module 14 detects that the secondary circuit is open, the coil of the relay 10 is controlled to cause the contacts to be closed.
The alarm indicator lamp 3 is arranged between the fastening screws on the upper row and the lower row on the surface of the shell 6, the alarm indicator lamp 3 is connected with the alarm signal output end of the monitoring module 14, the alarm signal output end of the monitoring module 14 is also connected to a wireless signal transmitter through a port D1 and a port D2, and the alarm signal is transmitted to a regulation center.
On the basis of the scheme, the method further comprises the following steps: still be provided with manual start button 1 and manual reset button 2 between the terminal of row about the shell 6 surface, manual start button 1 and manual reset button 2 all with relay 10 contact lug connection, work as the warning light and light, on-the-spot fortune dimension personnel can manual control relay 10's switching, overhaul the running state in secondary circuit as early as possible.
The back of the shell 6 is provided with a clamping groove 5, and the shell 6 can be installed on a terminal row on the field terminal box 7 through the clamping groove 5.
In order to further achieve the object of the present invention, the present invention also proposes a second embodiment.
Example 2:
as shown in fig. 5, the open-circuit protection device for the secondary circuit of the current transformer is installed on the second terminal row 9 of the field terminal box 7 through the card slot 5 at the back of the housing 6, the secondary circuit of the current transformer 11 is connected into the field terminal box 7 through the first terminal row 8, and is connected into the housing 6 through the port a1, the port B1, the port C1 and the port N1 at the top of the housing 6, and is led out to the load 12 end through the port a2, the port B2, the port C2 and the port N2 at the bottom of the housing 6, the hall current sensor 4 is arranged on the main circuit channel on the housing 6, the monitoring module 14, the voltage sensor 13 and the relay 10 are packaged in the housing 6, the contact of the relay 10 and the voltage sensor 13 are all connected in parallel on the secondary circuit, the signal input end of the monitoring module 14 is connected with the signal line of the voltage sensor 13, the hall current, the high level output end of the monitoring module 14 is connected with the coil of the relay 10; when the monitoring module 14 finds that the secondary circuit is open, the relay 10 contact is triggered to close, and the secondary circuit is short-circuited.
To further achieve the object of the present invention, the present invention also proposes a third embodiment.
Example 3:
based on embodiment 1 and embodiment 2, this embodiment provides a method for protecting an open circuit of a secondary circuit of a current transformer, which is applied to the open circuit protection device of the secondary circuit of the current transformer, and includes the following steps:
s1: the voltage sensor 13 monitors the voltage of the secondary loop, and the Hall current sensor 4 monitors the current of the secondary loop;
s2: the monitoring module 14 receives the sampling data of the voltage sensor 13 and the Hall current sensor 4 by a receiving unit;
s3: the monitoring module 14 respectively performs threshold value judgment on the voltage sampling value input by the voltage sensor 13 and the current sampling value input by the hall current sensor 4 by the analysis unit, judges that the data is abnormal when any one sampling value is greater than the threshold value, and executes S3, otherwise, continues to process the next group of data;
s4: the monitoring module 14 sends a unit to output an alarm signal and stores data in a storage unit;
s5: the alarm signal is transmitted to the alarm indicator lamp 3, and the alarm indicator lamp 3 is on;
s6: the monitoring module 14 performs an and logic judgment on the states of the voltage sampling value and the current sampling value obtained after the threshold value judgment by the analysis unit, executes S7 when the two sampling values are both abnormal data, and otherwise, continues to process the next group of data;
s7: the monitoring module 14 judges that the secondary circuit is in an open circuit state, and the sending unit outputs a high level signal;
s8: and a high-level signal is transmitted to a coil of the relay 10 to trigger the contact of the relay 10 to be closed, so that a secondary loop is short-circuited.
After step S5, the relay 10 contact may be closed manually by the manual reset button 2, shorting the secondary loop; after the check is finished, the contact of the relay 10 can be opened through the manual starting button 1, and the working state of the secondary circuit is recovered.
With the above embodiments, it can be seen that, in the present invention, the monitoring module 14, the relay 10, and other elements are packaged in the casing 6, and the voltage sensor 13, the relay 10, and other elements are connected in parallel to the secondary circuit inside, so that the electrical relationship on the secondary circuit is not affected, and the device does not need to be modified to match the fixed value by protection, measurement and control, and other devices after being connected. Once the monitoring module 14 finds that the secondary circuit is open, it triggers the relay 10 to close the contacts, resulting in a protection device similar to an air switch; the device is opposite to the principle of the air switch, the air switch is disconnected when the loop is short-circuited, and the device is short-circuited when the secondary loop is disconnected. According to the invention, the Hall current sensor 4 is skillfully arranged on the circuit main line channel on the shell 6, non-contact data sampling is realized through the high-precision Hall current sensor 4, a current transmission link is not increased, and an additional open circuit risk is not increased. The invention has the advantages of low cost, simple structure, easy realization and important value in the field of electrical equipment protection.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are changed from the content of the present specification and the drawings, or are directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (9)
1. The open circuit protection device for the secondary circuit of the current transformer is characterized by comprising a shell (6), a monitoring module, a relay (10) and a voltage sensor (13), wherein the monitoring module (14), the relay (10) and the voltage sensor (13) are packaged in the shell (6), contacts of the relay (10) and the voltage sensor (13) are connected in parallel on the secondary circuit, a signal input end of the monitoring module (14) is connected with a signal line of the voltage sensor (13), and a high-level output end of the monitoring module (14) is connected with a coil of the relay (10);
two groups of wiring ports are arranged on the surface of the shell (6), wherein,
the port A1, the port B1, the port C1, the port N1 and the port D1 are arranged at the top of the shell (6), fastening screws are arranged on the front face of the shell (6) corresponding to the ports, and the port A1, the port B1, the port C1 and the port N1 are used for connecting three-phase lines of a secondary circuit of the current transformer into the shell (6);
the port A2, the port B2, the port C2, the port N2 and the port D2 are arranged at the bottom of the shell (6), fastening screws are arranged on the front face of the shell (6) corresponding to the ports, and the port A2, the port B2, the port C2 and the port N2 are used for connecting loads into a secondary circuit through the shell (6);
port D1 and port D2 are ports for connecting the monitoring module (14) with external devices;
the secondary loop includes the internal conductors of port a1 to port a2, port B1 to port B2, port C1 to port C2, and port N1 to port N2.
2. The open circuit protection device for the secondary circuit of the current transformer according to claim 1, wherein a hall current sensor (4) is arranged on the port A1, the port B1, the port C1 and the port N1, and the hall current sensor (4) is connected with the second signal input end of the monitoring module (14).
3. The open circuit protection device for the secondary circuit of a current transformer according to claim 2, wherein the monitoring module (14) comprises:
a receiving unit: the device is used for receiving a voltage sampling value input by a voltage sensor (13) and a current sampling value input by a Hall current sensor (4);
an analysis unit: the device is used for analyzing and judging a voltage sampling value input by the voltage sensor (13) and a current sampling value input by the Hall current sensor (4);
a storage unit: the abnormal data storage unit is used for storing the abnormal data judged by the analysis unit;
a transmission unit: for outputting the control signal sent by the analyzing unit.
4. The open circuit protection device for the secondary circuit of the current transformer according to claim 1, characterized in that the contacts of the relay (10) are normally open, and when the monitoring module (14) detects the open circuit of the secondary circuit, the coil of the relay (10) is controlled to trigger the contacts to close.
5. The open circuit protection device for the secondary circuit of the current transformer according to claim 1, wherein an alarm indicator lamp (3) is arranged between the upper and lower rows of fastening screws on the surface of the shell (6), and the alarm indicator lamp (3) is connected with an alarm signal output end of the monitoring module (14).
6. The open circuit protection device for the secondary circuit of the current transformer according to claim 1, wherein a manual start button (1) and a manual reset button (2) are further arranged between the upper row of terminals and the lower row of terminals on the surface of the shell (6), and the manual start button (1) and the manual reset button (2) are both directly connected with the relay contact.
7. The open circuit protection device for the secondary circuit of the current transformer according to claim 1, wherein a slot (5) is arranged at the back of the housing (6), and the housing (6) can be mounted on a terminal block on a field terminal box through the slot (5).
8. A current transformer secondary circuit open circuit protection method is applied to any one of the current transformer secondary circuit open circuit protection devices of claims 1-7, and comprises the following steps:
s1: the voltage sensor (13) monitors the voltage of the secondary circuit, and the Hall current sensor (4) monitors the current of the secondary circuit;
s2: a receiving unit of the monitoring module (14) receives sampling data of the voltage sensor (13) and the Hall current sensor (4);
s3: the monitoring module (14) analysis unit respectively carries out threshold value judgment on a voltage sampling value input by the voltage sensor (13) and a current sampling value input by the Hall current sensor (4), when any sampling value is larger than a threshold value, the data is judged to be abnormal, S3 is executed, otherwise, the next group of data is continuously processed;
s4: the monitoring module (14) sends the unit to output an alarm signal and stores the data in the storage unit;
s5: the alarm signal is transmitted to the alarm indicator lamp (3), and the alarm indicator lamp (3) is on;
s6: the analysis unit of the monitoring module (14) carries out AND logic judgment on the states of the voltage sampling value and the current sampling value obtained after threshold judgment, S7 is executed when the two sampling values are abnormal data, and otherwise, the next group of data is processed continuously;
s7: the monitoring module (14) judges that the secondary loop is in an open circuit state, and the sending unit outputs a high level signal;
s8: and the high-level signal is transmitted to a coil of the relay (10), so that the contact of the relay (10) is triggered to be closed, and the secondary loop is short-circuited.
9. The open circuit protection method for the secondary circuit of the current transformer according to claim 8, wherein after step S5, the secondary circuit is short-circuited by closing the contact of the relay (10) through a manual reset button (2); after the detection is finished, the contact of the relay (10) can be opened through the manual starting button (1), and the working state of the secondary circuit is recovered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011145024.8A CN112165073A (en) | 2020-10-23 | 2020-10-23 | Current transformer secondary circuit open-circuit protection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011145024.8A CN112165073A (en) | 2020-10-23 | 2020-10-23 | Current transformer secondary circuit open-circuit protection device and method |
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| CN112165073A true CN112165073A (en) | 2021-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093062A (en) * | 2021-04-29 | 2021-07-09 | 北京送变电有限公司 | Terminal row open circuit monitoring system |
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2020
- 2020-10-23 CN CN202011145024.8A patent/CN112165073A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093062A (en) * | 2021-04-29 | 2021-07-09 | 北京送变电有限公司 | Terminal row open circuit monitoring system |
| CN113093062B (en) * | 2021-04-29 | 2023-06-27 | 北京送变电有限公司 | Terminal strip open circuit monitoring system |
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