CN112865095A - Current sampling circuit wiring structure of reactive power compensation device - Google Patents
Current sampling circuit wiring structure of reactive power compensation device Download PDFInfo
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- CN112865095A CN112865095A CN202110287589.8A CN202110287589A CN112865095A CN 112865095 A CN112865095 A CN 112865095A CN 202110287589 A CN202110287589 A CN 202110287589A CN 112865095 A CN112865095 A CN 112865095A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The application relates to a reactive power compensation device current sampling circuit wiring structure relates to the field of electric power distribution. The current sampling circuit comprises a first current transformer, a second current transformer and an auxiliary detection unit, wherein the first current transformer outputs a first current sampling signal, and the second current transformer outputs a second current sampling signal. When the first power supply is powered off, the second power supply supplies power to the first electric equipment, and the auxiliary detection unit outputs a third current sampling signal; when the second power supply is powered off, the first power supply supplies power to the second electrical equipment, and the auxiliary detection unit outputs a fourth current sampling signal. The first reactive compensation device responds to the first current sampling signal and the third current sampling signal, so that the first reactive compensation device always performs reactive compensation; the second reactive power compensation device responds to the second current sampling signal and the fourth current sampling signal, so that the second reactive power compensation device always performs reactive power compensation. The power distribution network power factor control method has the effect that the power factor of the power distribution network is not reduced.
Description
Technical Field
The application relates to the field of electric power distribution, in particular to a current sampling circuit wiring structure of a reactive power compensation device.
Background
Referring to fig. 1, in an electric power distribution network, a single bus segment connection mode powered by two power sources is more frequently used, and the single bus segment connection mode includes a first power source, a second power source, a first electric device, a second electric device, a first breaker QF1, a second breaker QF2, a first current transformer TA1, a second current transformer TA2 and a segment breaker QF 3.
In the wiring mode, when any power supply fails, the section breaker QF3 is closed, and the other power supply can carry all loads. Two paths of power supplies work simultaneously, and two sets of reactive compensation cabinets are needed to perform reactive compensation so as to improve the power factor.
When one of the power supplies is powered off due to failure or maintenance, the reactive power compensation device for performing reactive power compensation on the power supply is in an off-line standby state due to loss of the current sampling signal, so that reactive power compensation cannot be performed, and further, the power factor is reduced.
Disclosure of Invention
In order to prevent the power factor of an electric power system from being reduced, the application provides a wiring structure of a current sampling circuit of a reactive compensation device.
The application provides a pair of reactive power compensator current sampling circuit wiring structure adopts following technical scheme:
a reactive compensation device current sampling circuit wiring structure comprises a first electric device, a first power supply, a first circuit breaker QF1, a first current transformer TA1, a first reactive compensation device, a second electric device, a second power supply, a second circuit breaker QF2, a second current transformer TA2, a second reactive compensation device and a sectional circuit breaker QF 3;
the first power supply is connected with first electric equipment, a normally-open main contact QF1-1 of a first circuit breaker QF1 is connected between the first power supply and the first electric equipment in series, a primary winding of a first current transformer TA1 is connected around a circuit between the first power supply and the normally-open main contact QF1-1 of the first circuit breaker QF1, a secondary winding of the first current transformer TA1 is an output end, and a secondary winding of the first current transformer TA1 is grounded; the first current transformer TA1 detects the current flowing through the first breaker QF1 and outputs a first current sampling signal; the current signal input end of the first reactive compensation device is connected with the output end of a first current transformer TA1, the compensation end of the first reactive compensation device and the first electric equipment are connected in the same power distribution network, and the first reactive compensation device responds to the first current sampling signal and then carries out reactive compensation;
the second power supply is connected with second electrical equipment, a normally-open main contact QF2-1 of a second circuit breaker QF2 is connected between the second power supply and the second electrical equipment in series, a primary winding of a second current transformer TA2 is connected around a circuit between the second power supply and the normally-open main contact QF2-1 of the second circuit breaker QF2, and a secondary winding of the second current transformer TA2 is an output end; the secondary winding of the second current transformer TA2 is grounded; the second current transformer TA2 detects the current flowing through the second breaker QF2 and outputs a second current sampling signal; the current signal input end of the second reactive power compensation device is connected with the output end of a second current transformer TA2, the compensation end of the second reactive power compensation device and second electrical equipment are connected in the same power distribution network, and the second reactive power compensation device responds to a second current sampling signal and then performs reactive power compensation; a normally open main contact QF3-1 of the sectional breaker QF3 is connected in series between the first power supply and the second power supply;
the method is characterized in that: also comprises
The auxiliary detection unit is used for disconnecting a normally open main contact QF1-1 of the first circuit breaker QF1 and closing a normally open main contact QF3-1 of the segmented circuit breaker QF3 after the first power supply is powered off, the second power supply provides electric energy for the first electric equipment, the auxiliary detection unit collects current between the second power supply and the first electric equipment and outputs a third current sampling signal, a loop between the first reactive compensation device and the auxiliary detection unit is conducted, and the first reactive compensation device responds to the third current sampling signal and carries out reactive compensation on the first electric equipment through a compensation end of the first reactive compensation device; when the second power supply is powered off, a normally open main contact QF2-1 of a second circuit breaker QF2 is disconnected, a normally open main contact QF3-1 of a section circuit breaker QF3 is closed, a normally open main contact QF3-1 of the section circuit breaker QF3 is closed, the first power supply provides electric energy for the second electrical equipment, and the auxiliary detection unit collects current between the first power supply and the second electrical equipment and outputs a fourth current sampling signal; and a loop between the second reactive power compensation device and the auxiliary detection unit is conducted, and the second reactive power compensation device responds to the fourth current sampling signal and carries out reactive power compensation on the second electrical equipment through a compensation end of the second reactive power compensation device.
By adopting the technical scheme, the first power supply supplies power to the first electric equipment, the second power supply supplies power to the second electric equipment, the first current transformer TA1 detects the current flowing to the first electric equipment and outputs a first current sampling signal, the first reactive compensation device carries out reactive compensation after responding to the first current sampling signal, the detection unit detects the current flowing to the second electric equipment and outputs a second current sampling signal, the second reactive compensation device carries out reactive compensation after responding to the second current sampling signal, after the first power supply is powered off, when the normally open main contact QF1-1 of the first circuit breaker QF1 is opened and the normally open main contact QF3-1 of the sectional circuit breaker QF3 is closed, the second power supply supplies power to the first electric equipment, the auxiliary detection unit outputs a third current sampling signal, and the first reactive compensation device responds to the third current sampling signal and performs reactive compensation on a power distribution network where the first electric equipment is located; after the second power supply is powered off, the normally-open main contact QF2-1 of the second circuit breaker QF2 is disconnected, the normally-open main contact QF3-1 of the segmented circuit breaker QF3 is closed, the first power supply supplies power to the second electrical equipment, the auxiliary detection unit outputs a fourth current sampling signal, and the second reactive compensation device responds to the fourth current sampling signal and performs reactive compensation on a power distribution network where the second electrical equipment is located. The auxiliary detection unit and the first current transformer enable the first reactive power compensation device to be in a compensation state all the time, and the auxiliary detection unit and the second current transformer enable the second reactive power compensation device to be in a compensation state all the time, so that the power factor of the power system is not reduced.
Optionally, the auxiliary detection unit includes a third current transformer TA3, a normally open auxiliary contact QF3-2 of the sectionalized breaker QF3, a normally closed auxiliary contact QF1-3 of the first breaker QF1, and a normally closed auxiliary contact QF2-3 of the second breaker QF 2;
one end of the first breaker QF1 normally-closed auxiliary contact QF1-3 is connected to a connection node between the secondary winding output end of the first current transformer TA1 and the first reactive power compensation device, the other end of the first breaker QF1 normally-closed auxiliary contact QF1-3 is connected to one end of the second breaker QF2 normally-closed auxiliary contact QF2-3, and the other end of the second breaker QF2 normally-closed auxiliary contact QF2-3 is connected to a connection node between the secondary winding output end of the second current transformer TA2 and the second reactive power compensation device;
a primary winding of the third current transformer TA3 is connected between a normally-open main contact QF3-1 of the sectional breaker QF3 and a second power supply in a surrounding manner, a secondary winding of the third current transformer TA3 is an output end, and a normally-open auxiliary contact QF3-2 of the sectional breaker QF3 is connected in series with a connection node between the output end of the secondary winding of the third current transformer TA3 and a normally-closed auxiliary contact QF1-3 of the first breaker QF1 and a normally-closed auxiliary contact QF2-3 of the second breaker QF 2;
the third current transformer TA3 is used to detect the current flowing from the second power supply to the first electrical device and output a third current sample signal, and the third current transformer TA3 is also used to detect the current flowing from the first power supply to the second electrical device and output a fourth current sample signal.
By adopting the technical scheme, after the first power supply is powered off, the normally open main contact QF1-1 of the first circuit breaker QF1 is disconnected, the first passive compensation device cannot respond to the first current sampling signal output by the first current transformer TA1, the normally closed auxiliary contact QF1-3 of the first circuit breaker QF1 is closed, after the segmented circuit breaker QF3 is closed, the normally open main contact QF3-1 and the normally open auxiliary contact QF3-2 of the segmented circuit breaker QF3 are closed, the second power supply supplies power to the first electric equipment, the third current transformer TA3 collects the current flowing through the segmented circuit breaker QF3 and outputs a third current sampling signal, and the first passive compensation device responds to the third current sampling signal and performs reactive compensation; when the second power supply is powered off, the normally open main contact QF2-1 of the second circuit breaker QF2 is disconnected, the second reactive compensation device does not respond to a second current sampling signal output by the second current transformer TA2, the normally closed auxiliary contact QF2-3 of the second circuit breaker QF2 is closed, after the segmented circuit breaker QF3 is closed, the normally open main contact QF3-1 and the normally open auxiliary contact QF3-2 of the segmented circuit breaker QF3 are closed, the first power supply supplies power to the second electrical equipment, the third current transformer TA3 collects the current flowing through the segmented circuit breaker QF3 and outputs a fourth current sampling signal, and the second reactive compensation device responds to the fourth current sampling signal and performs reactive compensation. The first reactive compensation device and the second reactive compensation device are always connected in the power distribution network, so that the power factor of the system is not reduced.
Optionally, the normally open auxiliary contact QF1-2 of the first circuit breaker QF1 is connected in series between the secondary winding output of the first current transformer TA1 and the first reactive compensation device; the normally open auxiliary contact QF2-2 of the second circuit breaker QF2 is connected in series between the output end of the secondary winding of the second current transformer TA2 and the second reactive power compensation device.
By adopting the technical scheme, after the first power supply is powered off, when the normally-open main contact QF1-1 of the first circuit breaker QF1 is disconnected, the normally-open auxiliary contact QF1-2 of the first circuit breaker QF1 is automatically disconnected, so that the second power supply is prevented from reversely transmitting power to the first current transformer TA1 through the auxiliary detection unit, and the first current transformer TA1 is not easy to damage. After the second power supply is powered off, when the normally-open main contact QF2-1 of the second circuit breaker QF2 is disconnected, the normally-open auxiliary contact QF2-2 of the second circuit breaker QF2 is automatically disconnected, so that the first power supply is prevented from reversely transmitting power to the second current transformer TA2 through the auxiliary detection unit, and the second current transformer TA2 is not easy to damage.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the first power supply is powered off, a normally open main contact QF1-1 of a first circuit breaker QF1 is disconnected, and a normally open main contact QF3-1 of a segmented circuit breaker QF3 is closed, the second power supply provides electric energy for first electric equipment, an auxiliary detection unit collects current between the second power supply and the first electric equipment and outputs a third current sampling signal, a loop between a first reactive compensation device and the auxiliary detection unit is conducted, and the first reactive compensation device responds to the third current sampling signal and carries out reactive compensation on the first electric equipment through a compensation end of the first reactive compensation device; when the second power supply is powered off, a normally open main contact QF2-1 of a second circuit breaker QF2 is disconnected, a normally open main contact QF3-1 of a section circuit breaker QF3 is closed, a normally open main contact QF3-1 of the section circuit breaker QF3 is closed, the first power supply provides electric energy for the second electrical equipment, and the auxiliary detection unit collects current between the first power supply and the second electrical equipment and outputs a fourth current sampling signal; the second reactive power compensation device responds to the fourth current sampling signal and carries out reactive power compensation on the second electrical equipment through a compensation end of the second reactive power compensation device;
2. when the first power supply is powered off, a normally open main contact QF1-1 of a first circuit breaker QF1 is disconnected, the first passive compensation device cannot respond to a first current sampling signal output by a first current transformer TA1, a normally closed auxiliary contact QF1-3 of the first circuit breaker QF1 is closed, after a segmented circuit breaker QF3 is closed, a normally open main contact QF3-1 and a normally open auxiliary contact QF3-2 of a segmented circuit breaker QF3 are closed, the second power supply supplies power to first electric equipment, a third current transformer TA3 collects the current flowing through the segmented circuit breaker QF3 and outputs a third current sampling signal, and the first passive compensation device responds to the third current sampling signal and performs reactive compensation; when the second power supply is powered off, the normally open main contact QF2-1 of the second circuit breaker QF2 is disconnected, the second reactive compensation device does not respond to a second current sampling signal output by the second current transformer TA2, the normally closed auxiliary contact QF2-3 of the second circuit breaker QF2 is closed, after the segmented circuit breaker QF3 is closed, the normally open main contact QF3-1 and the normally open auxiliary contact QF3-2 of the segmented circuit breaker QF3 are closed, the first power supply supplies power to the second electrical equipment, the third current transformer TA3 collects the current flowing through the segmented circuit breaker QF3 and outputs a fourth current sampling signal, and the second reactive compensation device responds to the fourth current sampling signal and performs reactive compensation. The first reactive compensation device and the second reactive compensation device are always connected in the power distribution network, so that the power factor of the system is not reduced.
Drawings
Fig. 1 is a wiring diagram of a wiring structure of a current sampling circuit of a conventional reactive power compensation device.
Fig. 2 is a wiring diagram of a wiring structure of a current sampling circuit of a reactive compensation device according to an embodiment of the present application.
Description of reference numerals: 11: a first powered device; 12: a first power supply; QF 1: a first circuit breaker; TA 1: a first current transformer; 13: a first reactive compensation device; 21: a second electrical device; 22: a second power supply; QF 2: a second circuit breaker; TA 2: a second current transformer; 23: a second reactive power compensation device; 3: an auxiliary detection unit; QF 3: a sectionalizing circuit breaker.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses reactive power compensation device current sampling circuit wiring structure.
Referring to fig. 2, a reactive power compensation device current sampling circuit wiring structure includes a first electrical device 11, a second electrical device 21, a first power supply 12, a second power supply 22, a first current transformer TA1, a second current transformer TA2, a section breaker QF3 and an auxiliary detection unit 3, wherein a normally open main contact QF3-1 of the section breaker QF3 is connected between the first power supply 12 and the second power supply 22.
When the first power supply 12 and the second power supply 22 both normally supply power, the normally-open main contact QF3-1 of the section breaker QF3 is in an off state, the auxiliary detection unit 3 does not work, the first power supply 12 supplies power to the first electric device 11, and the second power supply 22 supplies power to the second electric device 21. The first power source 12 and the second power source 22 are both three-phase power, and after the first electric device 11 is connected with the first power source 12, the metal shell of the first electric device 11 is grounded. A first circuit breaker QF1 is provided between the first power source 12 and the first electrical device 11, and a normally open main contact QF1-1 of the first circuit breaker QF1 is connected in series between the first power source 12 and the first electrical device 11. A second circuit breaker QF2 is arranged between the second power source 22 and the second electrical device 21, and a normally open main contact QF2-1 of the second circuit breaker QF2 is connected in series between the second power source 22 and the second electrical device 21.
Three primary windings of a first current transformer TA1 are respectively connected to three wires of the first power supply 12 in a surrounding manner, three secondary windings of the first current transformer TA1 are output ends, the first current transformer TA1 detects the current flowing to the first electric device 11 and outputs a first current sampling signal at the output end, three primary windings of a second current transformer TA2 are respectively connected to three wires of the second power supply 22 in a surrounding manner, three secondary windings of the second current transformer TA2 are output ends, and the second current transformer TA2 detects the current flowing to the second electric device 21 and outputs a second current sampling signal at the output end. The three secondary windings of the first current transformer TA1 and the three secondary windings of the second current transformer TA2 are all grounded.
The current signal input terminal of the first reactive compensation device 13 is connected to the output terminal of the first current transformer TA1, the current signal output terminal of the first reactive compensation device 13 is grounded, the compensation terminal of the first reactive compensation device 13 is connected to the first electrical device 11 in the same power distribution network, and the enclosure of the first reactive compensation device 13 is grounded. The first reactive compensation device 13 responds to the first current sampling signal, and performs reactive compensation on a power distribution network where the first electric equipment 11 is located through a compensation end of the first reactive compensation device 13, so that the effects of energy conservation and consumption reduction are achieved; the current signal input terminal of the second reactive power compensation device 23 is connected to the output terminal of the second current transformer TA2, the compensation terminal of the second reactive power compensation device 23 is connected to the first electrical equipment 21 in the same distribution network, and the enclosure of the second reactive power compensation device 23 is grounded. The second reactive power compensation device 23 responds to the second current sampling signal, and performs reactive power compensation on the power distribution network where the second electrical equipment 21 is located through the compensation end of the second reactive power compensation device 23, so that the effects of energy conservation and consumption reduction are achieved.
When the first power supply 12 is disconnected, the normally open main contact QF1-1 of the first circuit breaker QF1 is opened, the normally open main contact QF3-1 of the segmented circuit breaker QF3 is closed, the second power supply 22 supplies power to the second electrical equipment 21, when the second power supply 22 is disconnected, the normally open main contact QF2-1 of the second circuit breaker QF2 is opened, the normally open main contact QF3-1 of the segmented circuit breaker QF3 is closed, the first power supply 12 supplies power to the second electrical equipment 21,
referring to fig. 2, the auxiliary detection unit 3 includes a section breaker QF3, a third current transformer TA3, a first breaker QF1 normally closed auxiliary contact QF1-3, a second breaker QF2 normally closed auxiliary contact QF2-3, and a section breaker QF3 normally open auxiliary contact QF 3-2.
One end of a normally closed auxiliary contact QF1-3 of the first circuit breaker QF1 is connected to a connection node between the output end of the secondary winding of the first current transformer TA1 and the first reactive compensation device 13, and the other end of the normally closed auxiliary contact QF1-3 of the first circuit breaker QF1 is a free end; one end of a normally closed auxiliary contact QF2-3 of the second circuit breaker QF2 is connected to a connection node between the output end of the secondary winding of the second current transformer TA2 and the second reactive power compensation device 23, and the other end of the normally closed auxiliary contact QF2-3 of the second circuit breaker QF2 is connected to the free end of the normally closed auxiliary contact QF1-3 of the first circuit breaker QF 1.
The primary winding of the third current transformer TA3 is connected between the second power supply 22 and a normally-open main contact QF3-1 of the sectional circuit breaker QF3 in a surrounding mode, one end of a normally-open auxiliary contact QF3-2 of the sectional circuit breaker QF3 is connected to the output end of the secondary winding of the third current transformer TA3 in a series mode, and the other end of the normally-open auxiliary contact QF3-2 of the sectional circuit breaker QF3 is connected to a connecting node of a normally-closed auxiliary contact QF1-3 of the first circuit breaker QF1 and a normally-closed auxiliary contact QF 36.
When the first power supply 12 encounters a fault or is overhauled, the normally-open main contact QF1-1 of the first circuit breaker QF1 is manually opened, the normally-closed auxiliary contact QF1-3 of the first circuit breaker QF1 is automatically closed, and the first current transformer TA1 cannot detect the magnitude of the current flowing from the first power supply 12 to the first electric equipment 11, so that the first current sampling signal cannot be output. After the section breaker QF3 is closed, the normally open main contact QF3-1 and the normally open auxiliary contact QF3-2 of the section breaker QF3 are closed, the second power supply 22 supplies power to the first electric equipment 11, the third current transformer TA3 detects the current flowing from the second power supply 22 to the first electric equipment 11 and outputs a third current sampling signal, and the first reactive compensation device 13 responds to the third current sampling signal and performs reactive compensation through the compensation end of the first reactive compensation device 13.
When the second power supply 22 encounters a fault or the fault, the normally-open main contact QF2-1 of the second circuit breaker QF2 is manually opened, the normally-closed auxiliary contact QF2-3 of the second circuit breaker QF2 is automatically closed, and the second current transformer TA2 cannot detect the magnitude of the current flowing from the second power supply 22 to the second electrical device 21, so that the second current sampling signal cannot be output. After the section breaker QF3 is closed, the normally open main contact QF3-1 and the normally open auxiliary contact QF3-2 of the section breaker QF3 are closed, the first power supply 12 supplies power to the second electrical equipment 21, the third current transformer TA3 detects the magnitude of the current flowing from the first power supply 12 to the second electrical equipment 21 and outputs a fourth current sampling signal, and the second reactive power compensation device 23 responds to the fourth current sampling signal and performs reactive power compensation through the compensation end of the second reactive power compensation device 23.
When one power supply is damaged, the two electric devices are always in a working state and the first compensation device and the second compensation device can always perform reactive compensation through the auxiliary detection unit 3, so that the power factor of the system is not reduced.
Referring to fig. 2, the normally open auxiliary contact QF1-2 of the first circuit breaker QF1 is connected in series between the secondary winding of the first current transformer TA1 and the first reactive power compensation device 13, and the normally open auxiliary contact QF2-2 of the second circuit breaker QF2 is connected in series between the secondary winding of the second current transformer TA2 and the second reactive power compensation device 23.
After the first power supply 12 is powered off, the first circuit breaker QF1 is disconnected, the normally open main contact QF1-1 of the first circuit breaker QF1 is disconnected, the normally open auxiliary contact QF1-2 of the first circuit breaker QF1 is automatically disconnected, and the normally closed auxiliary contact QF1-3 of the first circuit breaker QF1 is automatically closed; and (3) closing the section breaker QF3, and closing a normally-open main contact QF3-1 and a normally-open auxiliary contact QF3-2 of the section breaker QF 3. After the normally open auxiliary contact QF1-2 of the first circuit breaker QF1 is automatically disconnected, the second power supply 22 is prevented from supplying power to the first current transformer TA1 through the auxiliary detection unit 3, and therefore the first current transformer TA1 is not easy to damage.
After the second power supply 22 is powered off, the second circuit breaker QF2 is disconnected, the normally open main contact QF2-1 of the second circuit breaker QF2 is disconnected, the normally open auxiliary contact QF2-2 of the second circuit breaker QF2 is automatically disconnected, and the normally closed auxiliary contact QF2-3 of the second circuit breaker QF2 is automatically closed; and (3) closing the section breaker QF3, and closing a normally-open main contact QF3-1 and a normally-open auxiliary contact QF3-2 of the section breaker QF 3. After the normally open auxiliary contact QF2-2 of the second circuit breaker QF2 is automatically disconnected, the first power supply 12 is prevented from supplying power to the second current transformer TA2 through the auxiliary detection unit 3, and then the second current transformer TA2 is not easy to damage.
The current sampling circuit wiring structure of the reactive compensation device can also be used in circuits such as harmonic suppression devices or filtering compensation devices.
The implementation principle of the current sampling circuit wiring structure of the reactive power compensation device in the embodiment of the application is as follows: the first reactive compensation device 13 performs reactive compensation on a power distribution network where the first electric equipment 11 is located, the second reactive compensation device 23 performs reactive compensation on the power distribution network where the second electric equipment 21 is located, after the first power supply 12 is powered off, the second power supply 22 supplies power to the first electric equipment 11, the third current transformer TA3 detects the magnitude of current flowing from the second power supply 22 to the first electric equipment 11 and outputs a third current sampling signal, and the first reactive compensation device 13 responds to the third current sampling signal and performs reactive compensation on the power distribution network where the first electric equipment 11 is located; when the second power supply 22 is powered off, the first power supply 12 supplies power to the second electrical device 21, the third current transformer TA3 detects the magnitude of the current flowing from the first power supply 12 to the second electrical device 21 and outputs a fourth current sampling signal, the second reactive power compensation device 23 responds to the fourth current sampling signal and performs reactive power compensation on the power distribution network where the second electrical device 21 is located, and the first reactive power compensation device 13 and the second reactive power compensation device 23 are always connected in the power distribution network, so that the power factor of the system is not reduced, and the purposes of expected energy conservation and consumption reduction are achieved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (3)
1. A reactive compensation device current sampling circuit wiring structure comprises a first electric device (11), a first power supply (12), a first circuit breaker QF1, a first current transformer TA1, a first reactive compensation device (13), a second electric device (21), a second power supply (22), a second circuit breaker QF2, a second current transformer TA2, a second reactive compensation device (23) and a sectional circuit breaker QF 3;
the first power supply (12) is connected with first electric equipment (11), a normally-open main contact QF1-1 of a first circuit breaker QF1 is connected between the first power supply (12) and the first electric equipment (11) in series, a primary winding of a first current transformer TA1 is connected around a circuit between the first power supply (12) and the normally-open main contact QF1-1 of the first circuit breaker QF1, a secondary winding of the first current transformer TA1 is an output end, and a secondary winding of the first current transformer TA1 is grounded; the first current transformer TA1 detects the current flowing through the first breaker QF1 and outputs a first current sampling signal; the current signal input end of the first reactive compensation device (13) is connected with the output end of a first current transformer TA1, the compensation end of the first reactive compensation device (13) is connected with the first electric equipment (11) in the same power distribution network, and the first reactive compensation device (13) responds to the first current sampling signal and then carries out reactive compensation;
the second power supply (22) is connected with the second electrical equipment (21), the normally-open main contact QF2-1 of the second circuit breaker QF2 is connected between the second power supply (22) and the second electrical equipment (21) in series, the primary winding of the second current transformer TA2 is connected around a circuit between the second power supply (22) and the normally-open main contact QF2-1 of the second circuit breaker QF2, and the secondary winding of the second current transformer TA2 is an output end; the secondary winding of the second current transformer TA2 is grounded; the second current transformer TA2 detects the current flowing through the second breaker QF2 and outputs a second current sampling signal; the current signal input end of the second reactive power compensation device (23) is connected with the output end of a second current transformer TA2, the compensation end of the second reactive power compensation device (23) is connected with a second electric device (21) in the same power distribution network, and the second reactive power compensation device (23) responds to a second current sampling signal and then performs reactive power compensation; a normally open main contact QF3-1 of the sectional breaker QF3 is connected in series between the first power source (12) and the second power source (22);
the method is characterized in that: also comprises
The auxiliary detection unit (3) is used for disconnecting a normally-open main contact QF1-1 of the first circuit breaker QF1 and closing a normally-open main contact QF3-1 of the section circuit breaker QF3 after the first power supply (12) is powered off, the second power supply (22) provides electric energy for the first electric equipment (11), the auxiliary detection unit (3) collects current between the second power supply (22) and the first electric equipment (11) and outputs a third current sampling signal, a loop between the first reactive compensation device (13) and the auxiliary detection unit (3) is conducted, and the first reactive compensation device (13) responds to the third current sampling signal and carries out reactive compensation on the first electric equipment (11) through a compensation end of the first reactive compensation device (13); when the second power supply (22) is powered off, a normally open main contact QF2-1 of a second circuit breaker QF2 is opened, a normally open main contact QF3-1 of a section circuit breaker QF3 is closed, a normally open main contact QF3-1 of the section circuit breaker QF3 is closed, the first power supply (12) provides electric energy for the second electrical equipment (21), and the auxiliary detection unit (3) collects current between the first power supply (12) and the second electrical equipment (21) and outputs a fourth current sampling signal; and a loop between the second reactive power compensation device (23) and the auxiliary detection unit (3) is conducted, and the second reactive power compensation device (23) responds to the fourth current sampling signal and carries out reactive power compensation on the second electrical equipment (21) through a compensation end of the second reactive power compensation device (23).
2. The reactive compensation device current sampling circuit wiring structure of claim 1, wherein: the auxiliary detection unit (3) comprises a third current transformer TA3, a normally open auxiliary contact QF3-2 of a sectional breaker QF3, a normally closed auxiliary contact QF1-3 of a first breaker QF1 and a normally closed auxiliary contact QF2-3 of a second breaker QF 2;
one end of the first breaker QF1 normally-closed auxiliary contact QF1-3 is connected to a connection node between the secondary winding output end of the first current transformer TA1 and the first reactive power compensation device (13), the other end of the first breaker QF1 normally-closed auxiliary contact QF1-3 is connected to one end of the second breaker QF2 normally-closed auxiliary contact QF2-3, and the other end of the second breaker QF2 normally-closed auxiliary contact QF2-3 is connected to a connection node between the secondary winding output end of the second current transformer TA2 and the second reactive power compensation device (42);
a primary winding of the third current transformer TA3 is connected between a normally-open main contact QF3-1 and a second power supply (22) of the sectional breaker QF3 in a surrounding manner, a secondary winding of the third current transformer TA3 is an output end, and a normally-open auxiliary contact QF3-2 of the sectional breaker QF3 is connected in series with a connection node between the output end of the secondary winding of the third current transformer TA3 and a normally-closed auxiliary contact QF1-3 of the first breaker QF1 and a normally-closed auxiliary contact QF2-3 of the second breaker QF 2;
the third current transformer TA3 is used for detecting the current flowing from the second power source (22) to the first electrical device (11) and outputting a third current sampling signal, and the third current transformer TA3 is also used for detecting the current flowing from the first power source (21) to the second electrical device (12) and outputting a fourth current sampling signal.
3. The reactive compensation device current sampling circuit wiring structure of claim 1, wherein: the normally open auxiliary contact QF1-2 of the first circuit breaker QF1 is connected in series between the output end of the secondary winding of the first current transformer TA1 and the first reactive compensation device (13); the normally open auxiliary contact QF2-2 of the second circuit breaker QF2 is connected in series between the output end of the secondary winding of the second current transformer TA2 and the second reactive power compensation device (23).
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| CN202110287589.8A CN112865095A (en) | 2021-03-17 | 2021-03-17 | Current sampling circuit wiring structure of reactive power compensation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110287589.8A CN112865095A (en) | 2021-03-17 | 2021-03-17 | Current sampling circuit wiring structure of reactive power compensation device |
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