CN111130081A - System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch - Google Patents

System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch Download PDF

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Publication number
CN111130081A
CN111130081A CN202010250075.0A CN202010250075A CN111130081A CN 111130081 A CN111130081 A CN 111130081A CN 202010250075 A CN202010250075 A CN 202010250075A CN 111130081 A CN111130081 A CN 111130081A
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China
Prior art keywords
current
bypass switch
limiting reactor
capacitor
loop
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CN202010250075.0A
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CN111130081B (en
Inventor
洪贞贤
王明方
邱楠海
梁红燕
曹万磊
张均蔚
张婉仪
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Priority to CN202010250075.0A priority Critical patent/CN111130081B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/021Current limitation using saturable reactors

Abstract

The invention provides a system for reducing electric energy loss by additionally arranging a bypass switch of a current-limiting reactor, which comprises: the device comprises a capacitor, a current-limiting reactor, a current transformer, a circuit breaker, a bypass switch and a measurement and control unit, wherein a primary winding of the current transformer is connected with one end of the circuit breaker, the other end of the circuit breaker is respectively connected with one end of the current-limiting reactor and one end of the bypass switch, and the other end of the current-limiting reactor and the other end of the bypass switch are connected with the capacitor; the invention also provides a method for reducing electric energy loss by additionally arranging the current limiting reactor bypass switch, which can inhibit inrush current at the moment of capacitor input, improve power supply quality, enable the reactor to timely quit the circuit after the capacitor is put into operation, reduce electric energy loss and have low requirement on time response speed.

Description

System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch
Technical Field
The invention relates to the technical field of regulating electric energy loss of a current-limiting reactor, in particular to a system and a method for reducing electric energy loss by additionally arranging a bypass switch of the current-limiting reactor.
Background
After the 10kV parallel capacitor is installed in the transformer substation, the power factor of a transformer substation line can be improved, reactive power is compensated, voltage can be improved, line loss is reduced, electric charge expenditure is reduced, energy is saved, transmission of active capacity of a power grid is increased, and the service efficiency of equipment is improved.
Referring to fig. 1, in fig. 1, DL represents a circuit breaker for controlling switching of a capacitor C, CT represents a current transformer, if the capacitor C is not provided with a current limiting reactor, the voltage between the capacitor poles is zero before the capacitor C is not operated, and as can be known from the theory of electricians, the voltage across the capacitor C cannot change abruptly, therefore, at the moment after the switch of the capacitor C circuit is closed and power is transmitted, the voltage between the two electrodes of the capacitor C remains zero, and at this time, all the voltages are applied between the circuits before the switch to the capacitor C, because the loop resistance is very small, the voltage will generate a large inrush current in the loop, after hundreds of milliseconds to a few seconds, the two ends of the capacitor are charged stably, the loop can recover to the normal rated current, a large inrush current lasting a long time before the charging across the capacitor is stable will trip the switch protection, resulting in unsuccessful commissioning. In order to suppress the inrush current, a current-limiting reactor is conventionally connected in series to each group of capacitor C loops, but the current-limiting reactor has two problems in operation: the influence on power supply quality and electric energy loss are large, and in order to inhibit the instantaneous inrush current phenomenon during switching-on and improve the power supply quality, a user has to bear huge electric energy loss to meet the requirement of electric power operation.
The existing method for additionally installing a current-limiting reactor fast bypass switch is mainly applied to the current-limiting operation when a system has a short-circuit fault, the action requirement of the fast bypass switch is high, the fast bypass switch needs to be quickly disconnected through a fuse and the switch, otherwise, the current-limiting effect cannot be achieved, the requirement on the response speed is strict, the requirement on the time response speed is not strict for the current limiting of a conventional capacitor bank, the additionally installed current-limiting reactor only plays a role at the moment of capacitor operation, and the side effect of electric energy loss caused by other time is larger on the contrary, so the current limiting of the conventional capacitor bank is more focused on reducing the electric energy loss, and the existing method for additionally installing the current-limiting reactor fast bypass switch is not applicable to the current limiting of the capacitor bank.
In summary, when the capacitor bank is put into operation, how to reduce the power loss of the system by additionally installing the current-limiting reactor bypass switch becomes a problem to be solved urgently.
Disclosure of Invention
When the current-limiting reactor is additionally arranged in the capacitor bank, the defect of increasing the electric energy loss of the system is caused, and a user has to adopt the current-limiting reactor to inhibit the inrush current at the moment of switching on the capacitor.
The present invention aims to solve the above technical problem at least to some extent.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
the utility model provides a system for install current-limiting reactor bypass switch additional and reduce power loss, includes: the device comprises a capacitor C, a current-limiting reactor, a current transformer, a breaker DL for controlling the switching of the capacitor C, a bypass switch F and a measurement and control unit, wherein a primary winding of the current transformer is connected with one end of the breaker DL, the other end of the breaker DL is respectively connected with one end of the current-limiting reactor and one end of the bypass switch F, and the other end of the current-limiting reactor and the other end of the bypass switch F are connected with the capacitor C; the measurement and control unit is provided with a current relay LJ, the current relay LJ is connected with a secondary winding of the current transformer, and the measurement and control unit controls the opening and closing of the bypass switch F through the action state of the current relay LJ.
In this application, the measurement and control unit is the design of secondary circuit, monitors, controls, measures and adjusts the operating mode of the primary circuit at condenser C place, utilizes the secondary winding of the current transformer of the current relay LJ series access system among the measurement and control unit, realizes the monitoring to the primary circuit operating mode at condenser C place, like voltage current and switch on-off condition.
Preferably, the measurement and control unit comprises an alternating current loop unit and a direct current loop unit, and the alternating current loop unit is formed by connecting a current relay LJ and a secondary winding of a current transformer in series; the direct current loop unit comprises a closing loop and an opening loop, the closing loop is connected with the opening loop in parallel, the current relay LJ controls the closing of the bypass switch F by controlling the connection of the closing loop, and the current relay LJ controls the opening of the bypass switch F by controlling the disconnection of the opening loop.
Preferably, the closing circuit comprises a time-delay normally-open contact LJ1, a first auxiliary contact QF1 and a closing coil HC, and the time-delay normally-open contact LJ1, the first auxiliary contact QF1 and the closing coil HC are sequentially connected in series; the opening circuit comprises a normally closed contact LJ2, a second auxiliary contact QF2 and an opening coil TC, wherein the normally closed contact LJ2, the second auxiliary contact QF2 and the opening coil TC are sequentially connected in series.
Preferably, when the breaker DL is disconnected and the capacitor C is not put into operation, the current relay LJ of the measurement and control unit does not act, the normally closed contact LJ2 of the opening circuit is switched on, the second auxiliary contact QF2 is closed, the opening coil TC is electrified to act, the bypass switch F is opened, the current limiting reactor is connected to the system, the breaker DL is used for controlling the switching of the capacitor C, the breaker DL is disconnected, the capacitor C is not put into operation, and the current limiting reactor is connected to the system to prepare for the operation of the capacitor C and play a role in suppressing inrush current at the early stage of the operation of the capacitor C.
Preferably, when the capacitor C is not in operation, the measurement and control unit monitors that the amplitude of the current flowing through the current relay LJ is zero. The current monitored by the measurement and control unit can be performed through the existing relatively mature operation, and when the capacitor C is not in operation, the current of the system where the capacitor C is located is zero, so that the amplitude of the current flowing through the current relay LJ is also zero when the measurement and control unit monitors the current.
Preferably, after the capacitor C is put into operation and the system current is stable, the current relay LJ operates, the delay normally-open contact LJ1 of the closing loop is switched on after t seconds of delay, the first auxiliary contact QF1 is closed, the closing coil HC is electrified to operate, the bypass switch F is closed, and the current-limiting reactor exits the system.
Here, the delay time t of the delay normally-open contact LJ1 is set to complete charging of the matching capacitor C, so that after the current of the system is monitored to be stable, the whole measurement and control unit is automatically switched on the delay normally-open contact LJ1 through the set delay time t, manual control of a bypass switch is avoided, and after the capacitor C is stably put into operation, the current-limiting reactor can be timely withdrawn, and huge electric energy loss caused by the existence of the current-limiting reactor is reduced.
Preferably, the system current stabilization criteria are: the measurement and control unit monitors that the current flowing through the current relay LJ is rated current after the capacitor C is put into operation for t1 secondsI
Here, the set capacitor C operation time t1 represents the time of the whole charging process of the capacitor C after the capacitor C is put into operation, when the charging of the capacitor C is completed, the current of the capacitor loop returns to normal, and the current flowing through the current relay LJ monitored by the measurement and control unit is the rated current I.
Preferably, the delay time t of the delay normally-open contact LJ1 of the closing circuit is longer than t1, so that when the delay normally-open contact LJ1 is switched on after the delay time t seconds, the capacitor C is charged in t1 seconds, and the whole system enters a stable state.
Preferably, the first auxiliary contact QF1 is automatically opened and the second auxiliary contact QF2 is automatically closed after the energizing operation of the closing coil HC; the second auxiliary contact QF2 is automatically switched off after the opening coil TC is electrified, and the first auxiliary contact QF1 is automatically switched on, so that the phenomenon that the closing coil HC and the opening coil TC are burnt out due to long-time electrification is avoided.
Here, the on and off of the first auxiliary contact QF1 and the second auxiliary contact QF2 are associated with the on/off state of the bypass switch F, that is, when the bypass switch is opened after the opening coil TC is energized, the second auxiliary contact QF2 is automatically opened, and the first auxiliary contact QF1 is automatically turned on, in preparation for the next closing, and when the bypass switch F is closed after the closing coil HC is energized, the first auxiliary contact QF1 is automatically turned off, and the second auxiliary contact QF2 is automatically turned on, in preparation for the next closing.
A method for reducing electric energy loss by additionally arranging a current-limiting reactor bypass switch at least comprises the following steps:
s1, connecting the end b of a bypass switch F with the end a of a current-limiting reactor, and connecting the end d of the bypass switch F with the end c of the current-limiting reactor;
s2, connecting a current relay LJ in the measurement and control unit with a secondary winding of a current transformer;
s3, judging whether the capacitor C is put into operation or not, if so, executing a step S4; otherwise, the current relay LJ does not act, the bypass switch F is opened, and the current-limiting reactor is connected into the circuit;
s4, judging whether the system current is stable, if so, actuating a current relay LJ, closing a bypass switch F, and withdrawing the current-limiting reactor from the circuit; otherwise, the current relay LJ does not operate.
After a current relay LJ in the measurement and control unit is connected with a secondary winding of the current transformer, the measurement and control unit can monitor the current flowing through the current relay LJ so as to monitor the current of a system where a primary winding of the current transformer, namely a capacitor C, is located, and judge whether the capacitor C is put into operation or not by judging whether the amplitude of the current flowing through the current relay LJ is zero or not; and judging whether the system current is stable or not by monitoring whether the current flowing through the current relay LJ is the rated current or not.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a system and a method for reducing electric energy loss by additionally arranging a bypass switch of a current-limiting reactor, which control the opening and closing of a bypass switch F according to the action state of the response of a current relay in a measurement and control unit by judging whether a capacitor is put into operation and whether the system current is stable, thereby controlling the input and the exit of the current-limiting reactor: when the capacitor is not put into operation, the current relay does not act, the bypass switch is switched off, and the current-limiting reactor is put into a circuit to prepare for putting the capacitor into operation, so that the inrush current phenomenon before the capacitor is charged stably is inhibited, and the power supply quality is improved; when the current of the capacitor loop is stable, the current relay acts, the bypass switch is switched on, and the current-limiting reactor exits the circuit, so that the electric energy loss of the system is reduced, and the requirement on time response speed is low because the cooperation of devices with high time response speed performance requirements such as a fuse, a quick switch and the like is not needed.
Drawings
Fig. 1 is a circuit diagram of the capacitor operation proposed in the background of the invention.
Fig. 2 is a schematic circuit structure diagram of a bypass switch with a current-limiting reactor according to an embodiment of the present invention.
Fig. 3 is a circuit structure diagram of the structure measurement and control unit M in fig. 2.
Fig. 4 is a schematic flow chart of a method for reducing electric energy loss by additionally installing a current-limiting reactor bypass switch provided by the invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for better illustration of the present embodiment, certain parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions;
it will be understood by those skilled in the art that certain well-known illustrations in the drawings 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 invention provides a system for reducing electric energy loss by additionally arranging a bypass switch of a current-limiting reactor, a schematic structural diagram of which is shown in figure 2, and the system comprises: the device comprises a capacitor C, a current-limiting reactor 1, a current transformer 2, a breaker DL for controlling the switching of the capacitor C, a bypass switch F and a measurement and control unit 3, wherein a primary winding 21 of the current transformer 2 is connected with one end of the breaker DL, the other end of the breaker DL is respectively connected with one end of the current-limiting reactor 1 and one end of the bypass switch F, and the other end of the current-limiting reactor 1 and the other end of the bypass switch F are connected with the capacitor C; the measurement and control unit 3 is provided with a current relay LJ, the current relay LJ is connected with a secondary winding 22 of the current transformer 2, and the measurement and control unit 3 controls the opening and closing of the bypass switch F through the action state of the current relay LJ.
During specific implementation, the measurement and control unit 3 is designed as a secondary loop, monitors, controls, measures and adjusts the working condition of the primary loop where the capacitor C is located, and monitors the working condition of the primary loop where the capacitor C is located, such as voltage current and on-off conditions of a switch, by connecting a current relay LJ in the measurement and control unit 3 in series into a secondary winding 22 of a current transformer 2 of a system.
A structure M in fig. 2 shows the measurement and control unit 3, specifically, a circuit structure diagram of the measurement and control unit 3 is shown in fig. 3, the measurement and control unit 3 includes an ac loop unit 31 and a dc loop unit 32, the ac loop unit 31 is formed by connecting a current relay LJ and a secondary winding 22 of the current transformer 2 in series; the dc loop unit 32 includes a closing loop 321 and an opening loop 322, the closing loop 321 is connected in parallel with the opening loop 322, the current relay LJ controls the closing of the bypass switch F by controlling the closing loop 321, and the current relay LJ controls the opening of the bypass switch F by controlling the opening of the opening loop 322.
The closing loop 321 comprises a time-delay normally-open contact LJ1, a first auxiliary contact QF1 and a closing coil HC, and the time-delay normally-open contact LJ1, the first auxiliary contact QF1 and the closing coil HC are sequentially connected in series; the opening circuit 322 includes a normally closed contact LJ2, a second auxiliary contact QF2 and an opening coil TC, and the normally closed contact LJ2, the second auxiliary contact QF2 and the opening coil TC are connected in series in sequence.
With reference to fig. 2 and fig. 3, in this embodiment, when the breaker DL is turned off and the capacitor C is not in operation, the current relay LJ of the measurement and control unit 3 does not operate, the normally closed contact LJ2 of the opening circuit is turned on, the second auxiliary contact QF2 is closed, the opening coil TC is energized to operate, the bypass switch F opens, the current limiting reactor is connected to the system, the breaker DL is used to control the switching of the capacitor C, the breaker DL is turned off, the capacitor C is not in operation, and the current limiting reactor is connected to the system to prepare for the operation of the capacitor C, so as to play a role in suppressing inrush current in the operation of the capacitor C in an early stage.
When the capacitor C is not in operation, the measurement and control unit monitors that the amplitude of the current flowing through the current relay LJ is zero. When the capacitor is not in operation, the current of the system where the capacitor C is located is zero, and therefore the amplitude of the current flowing through the current relay LJ is also zero when the measurement and control unit monitors the current.
After the capacitor C is put into operation and the system current is stable, the current relay LJ acts, the delay normally-open contact LJ1 of the closing loop is switched on after t seconds of delay, the first auxiliary contact QF1 is closed, the closing coil HC acts in a power-on mode, the bypass switch F is closed, and the current-limiting reactor exits the system.
Here, the delay time t of the delay normally-open contact LJ1 is set to complete charging of the matching capacitor C, so that after the current of the system is monitored to be stable, the whole measurement and control unit is automatically switched on the delay normally-open contact LJ1 through the set delay time t, manual control of a bypass switch is avoided, and after the capacitor C is stably put into operation, the current-limiting reactor can be timely withdrawn, and huge electric energy loss caused by the existence of the current-limiting reactor is reduced.
The system current stabilization criteria are: the measurement and control unit monitors that the current flowing through the current relay LJ is rated current after the capacitor C is put into operation for t1 secondsI
Here, the set capacitor C operation time t1 represents the time of the whole charging process of the capacitor C after the capacitor C is put into operation, when the charging of the capacitor C is completed, the current of the capacitor loop returns to normal, and the current flowing through the current relay LJ monitored by the measurement and control unit is the rated current I.
The delay time t of the delay normally-open contact LJ1 of the closing loop is longer than t1, so that when the delay normally-open contact LJ1 is switched on after the delay time t seconds, the capacitor C is charged after being put into operation for t1 seconds, and the whole system enters a stable state. In the embodiment, t1 is 2 seconds, since the capacitor can be charged within 2 seconds, in the specific implementation, the delay time t of the delay normally open contact LJ1 of the closing circuit 321 may be 3 s-5 s. The first auxiliary contact QF1 is automatically opened after the closing coil HC is electrified and the bypass switch F is operated, and the second auxiliary contact QF2 is automatically closed; the second auxiliary contact QF2 is automatically switched off after the opening coil TC is electrified and the bypass switch F is operated, and the first auxiliary contact QF1 is automatically switched on, so that the phenomenon that the closing coil HC and the opening coil TC are burnt out due to long-time electrification is avoided. The on and off of the first auxiliary contact QF1 and the second auxiliary contact QF2 are associated with the on/off state of the bypass switch F, i.e. when the bypass switch is opened after the opening coil TC is energized, the second auxiliary contact QF2 is automatically turned off, and the first auxiliary contact QF1 is automatically turned on, in preparation for the next closing, and when the bypass switch F is closed after the closing coil HC is energized, the first auxiliary contact QF1 is automatically turned off, and the second auxiliary contact QF2 is automatically turned on, in preparation for the next closing.
The invention also provides a method for reducing electric energy loss by additionally arranging a bypass switch of a current-limiting reactor, the flow diagram of the method is shown in figure 4, and the method is combined with the schematic circuit structure diagram of additionally arranging the bypass switch of the current-limiting reactor shown in figure 2, and the steps are as follows:
s1, connecting the end b of a bypass switch F with the end a of a current-limiting reactor 1, and connecting the end d of the bypass switch F with the end c of the current-limiting reactor 1;
s2, connecting a current relay LJ in the measurement and control unit 3 with A, B-phase secondary windings 22 of the current transformer 2;
s3, judging whether the capacitor C is put into operation or not, if so, executing a step S4; otherwise, the current relay LJ does not act, the bypass switch F is switched off, and the current-limiting reactor 1 is connected into the circuit;
s4, judging whether the system current is stable, if so, actuating a current relay LJ, closing a bypass switch F, and withdrawing the current-limiting reactor 1 from the circuit; otherwise, the current relay LJ does not operate.
After the current relay LJ of the measurement and control unit 3 is connected with the secondary winding of the current transformer 2, the measurement and control unit 3 can monitor the current flowing through the current relay LJ, so as to monitor the current of the primary winding 21 of the current transformer 2, namely the system where the capacitor C is located, and judge whether the capacitor C is put into operation or not by judging whether the amplitude of the current flowing through the current relay LJ is zero or not; and judging whether the system current is stable or not by monitoring whether the current flowing through the current relay LJ is the rated current or not.
The same or similar reference numerals correspond to the same or similar parts;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present 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 install current-limiting reactor bypass switch additional and reduce electric energy loss's system which characterized in that includes: the device comprises a capacitor C, a current-limiting reactor, a current transformer, a breaker DL for controlling the switching of the capacitor C, a bypass switch F and a measurement and control unit, wherein a primary winding of the current transformer is connected with one end of the breaker DL, the other end of the breaker DL is respectively connected with one end of the current-limiting reactor and one end of the bypass switch F, and the other end of the current-limiting reactor and the other end of the bypass switch F are connected with the capacitor C; the measurement and control unit is provided with a current relay LJ, the current relay LJ is connected with a secondary winding of the current transformer, and the measurement and control unit controls the opening and closing of the bypass switch F through the action state of the current relay LJ.
2. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch is characterized in that the measurement and control unit comprises an alternating current loop unit and a direct current loop unit, wherein the alternating current loop unit is formed by connecting a current relay LJ and a secondary winding of a current transformer in series; the direct current loop unit comprises a closing loop and an opening loop, the closing loop is connected with the opening loop in parallel, the current relay LJ controls the closing of the bypass switch F by controlling the connection of the closing loop, and the current relay LJ controls the opening of the bypass switch F by controlling the disconnection of the opening loop.
3. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch according to claim 2, wherein the closing loop comprises a time-delay normally-open contact LJ1, a first auxiliary contact QF1 and a closing coil HC, and the time-delay normally-open contact LJ1, the first auxiliary contact QF1 and the closing coil HC are sequentially connected in series; the opening circuit comprises a normally closed contact LJ2, a second auxiliary contact QF2 and an opening coil TC, wherein the normally closed contact LJ2, the second auxiliary contact QF2 and the opening coil TC are sequentially connected in series.
4. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch as claimed in claim 3, is characterized in that when the breaker DL is disconnected and the capacitor C is not put into operation, the current relay LJ of the measurement and control unit does not act, the normally closed contact LJ2 of the brake-separating loop is connected, the second auxiliary contact QF2 is closed, the brake-separating coil TC is electrified to act, the bypass switch F is separated, and the current-limiting reactor is connected into the system.
5. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch according to claim 4, wherein when the capacitor C is not in operation, the measurement and control unit monitors that the amplitude of the current flowing through the current relay LJ is zero.
6. The system for reducing the electric energy loss by additionally arranging the bypass switch of the current-limiting reactor according to claim 5 is characterized in that after the capacitor C is put into operation and the system current is stable, the current relay LJ acts, the time-delay normally-open contact LJ1 of the closing loop is switched on after t seconds of time delay, the first auxiliary contact QF1 is closed, the closing coil HC acts in a power-on mode, the bypass switch F is closed, and the current-limiting reactor exits from the system.
7. The system for reducing the electric energy loss by additionally installing the current-limiting reactor bypass switch according to claim 6, is characterized in that the system current stabilization standard is as follows: measurement and control unit in capacitorAfter t1 seconds of C operation, the current flowing through the current relay LJ is monitored to be the rated currentI
8. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch according to claim 7, wherein the delay time t of the delayed normally-open contact LJ1 of the closing loop is greater than t 1.
9. The system for reducing the electric energy loss by additionally arranging the current-limiting reactor bypass switch is characterized in that the first auxiliary contact QF1 is automatically opened after a closing coil HC is electrified and a bypass switch F is operated, and the second auxiliary contact QF2 is automatically closed; the second auxiliary contact QF2 is automatically turned off after the opening coil TC is electrified and the bypass switch F is operated, and the first auxiliary contact QF1 is automatically turned on.
10. A method for reducing electric energy loss by additionally installing a current-limiting reactor bypass switch, wherein the method is implemented based on the system of any one of claims 1 to 9, and the method at least comprises the following steps:
s1, connecting the end b of a bypass switch F with the end a of a current-limiting reactor, and connecting the end d of the bypass switch F with the end c of the current-limiting reactor;
s2, connecting a current relay LJ in the measurement and control unit with a secondary winding of a current transformer;
s3, judging whether the capacitor C is put into operation or not, if so, executing a step S4; otherwise, the current relay LJ does not act, the bypass switch F is opened, and the current-limiting reactor is connected into the circuit;
s4, judging whether the system current is stable, if so, actuating a current relay LJ, closing a bypass switch F, and withdrawing the current-limiting reactor from the circuit; otherwise, the current relay LJ does not operate.
CN202010250075.0A 2020-04-01 2020-04-01 System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch Active CN111130081B (en)

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