CN211266482U - Three-phase reactor excitation on-load voltage regulation system - Google Patents
Three-phase reactor excitation on-load voltage regulation system Download PDFInfo
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- CN211266482U CN211266482U CN201920458701.8U CN201920458701U CN211266482U CN 211266482 U CN211266482 U CN 211266482U CN 201920458701 U CN201920458701 U CN 201920458701U CN 211266482 U CN211266482 U CN 211266482U
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Abstract
The utility model provides a three-phase reactor excitation on-load voltage regulation system, which comprises a three-phase reactor and an on-load voltage regulation circuit unit; the three-phase reactor comprises a main inductance winding and an excitation winding; the on-load voltage regulating circuit unit comprises a voltage reduction alternating current contactor, a voltage boosting alternating current contactor, two terminal alternating current contactors, a follow current contactor unit and a bypass short circuit unit; the main induction winding is connected in series between the load and the power grid; the excitation winding is respectively connected with the bypass short-circuit unit and the follow current contactor unit in parallel; the voltage reduction alternating current contactor is respectively communicated with the tail end of the main inductance winding and the head end of the excitation winding; the boosting alternating current contactor is respectively communicated with the head end of the main inductance winding and the tail end of the excitation winding; the terminal alternating current contactors are respectively short-circuited at the head end and the tail end of the excitation winding. The utility model discloses series connection three-phase reactor excitation on-load voltage regulation between electric wire netting and load has realized the on-load voltage regulation, does not need power transformer to have tapping winding and on-load tapping switch.
Description
Technical Field
The utility model belongs to low pressure transformer and distribution field especially relate to a three-phase reactor excitation on-load voltage regulation system.
Background
At present, a tap changer is mainly adopted by a power system to adjust a transformer winding tap for carrying out no-load voltage regulation or on-load voltage regulation. Because the no-load voltage regulation operation of the transformer needs the power failure of the transformer, the power failure of the electric equipment is caused, and the mode is not commonly used, so the on-load voltage regulation mode of the transformer and the tap changer can be adopted for voltage regulation. The on-load tap-changer is called: the OLTC may be provided with a load to adjust the primary winding or the secondary winding tap of the transformer, and the voltage adjustment is realized by changing the voltage ratio of the primary winding and the secondary winding of the transformer.
However, the on-load tap-changer has the following defects in the working process: 1) a plurality of transition resistors are needed to maintain the load current in the tapping process, and the transition resistors bear both the differential pressure circulation of the tapping end of the transformer and the load current, so that the power of the transition resistors is high; 2) the transition resistor needs to be integrated in the tap changer assembly, and the requirements of heat dissipation and insulation are considered, so that the installation difficulty is increased; 3) the resistance lead is under the action of electromagnetic force and high voltage and large current, so that breakdown or open circuit is easy to occur, the tapping process is cut off, high voltage electric arc is generated, the tapping switch is damaged, and power failure is caused; 4) the service life of the on-load tap changer is short, the technical requirement of regular maintenance is high, and statistics shows that the fault of the tap changer accounts for 20% of the fault rate of the transformer.
Disclosure of Invention
An object of the utility model is to provide a three-phase reactor excitation on-load voltage regulation system, according to electromagnetism theory, utilize the self-inductance potential of reactor to adjust output voltage to finally realize the automatic on-load voltage regulation of three-phase, solved among the prior art because the tapping winding that relies on the transformer, and derived tapping switch and the above-mentioned technical problem that causes from this. In order to achieve the above object, the utility model adopts the following technical scheme:
a three-phase reactor excitation on-load voltage regulation system comprises a three-phase reactor and an on-load voltage regulation circuit unit; the three-phase reactor comprises a main induction winding and an excitation winding; the on-load voltage regulating circuit unit comprises a step-down alternating current contactor, a step-up alternating current contactor, two terminal alternating current contactors, a follow current contactor unit and a bypass short-circuit unit;
the main induction winding is connected in series between a load and a power grid; the excitation winding is respectively connected with the bypass short-circuit unit and the follow current contactor unit in parallel; the follow current contactor unit is closed before the terminal alternating current contactor is switched in the process of switching the terminal alternating current contactor, and then is disconnected after the terminal alternating current contactor finishes switching;
the step-down alternating current contactor is respectively communicated with the tail end of the main induction winding and the head end of the excitation winding;
the boosting alternating current contactor is respectively communicated with the head end of the main induction winding and the tail end of the excitation winding;
the terminal alternating current contactors are respectively short-circuited at the head end and the tail end of the excitation winding;
in a boosting state, the voltage reduction alternating current contactor and the terminal alternating current contactor at the tail end of the excitation winding are disconnected; the step-up alternating current contactor is closed, and the terminal alternating current contactor at the head end of the excitation winding is closed to communicate with the excitation loop;
when the voltage is reduced, the boosting AC contactor and the terminal AC contactor at the head end of the excitation winding are disconnected; and the step-down alternating current contactor is closed, and the terminal alternating current contactor at the tail end of the excitation winding is closed to communicate with the excitation loop.
Preferably, the excitation winding comprises a first winding, a second winding and a third winding which are sequentially connected in series;
the head end of the second winding is communicated with the tail end of the first winding; the tail end of the second winding is communicated with the head end of the third winding;
and the tail end of the first winding and the tail end of the second winding are respectively connected with a terminal alternating current contactor in series.
Preferably, the boosting state comprises a first boosting working condition, a second boosting working condition and a third boosting working condition;
when the first boosting working condition is adopted, the boosting alternating current contactor and a terminal alternating current contactor positioned at the head end of the excitation winding are closed;
under a second boosting working condition, the boosting alternating current contactor and a terminal alternating current contactor positioned at the tail end of the first winding are closed;
and in the third boosting working condition, the boosting alternating current contactor and the terminal alternating current contactor positioned at the tail end of the second winding are closed.
Preferably, in the first boosting condition, the output voltage is equal to 103% of the input voltage; under the second boosting working condition, the output voltage is equal to 105% of the input voltage; in the third boost condition, the output voltage is equal to 107% of the input voltage.
Preferably, the depressurization state comprises a first depressurization operating condition, a second depressurization operating condition and a third depressurization operating condition;
when the first voltage reduction working condition is adopted, the voltage reduction alternating current contactor and a terminal alternating current contactor positioned at the tail end of the excitation winding are closed;
under a second voltage reduction working condition, the voltage reduction alternating current contactor and the terminal alternating current contactor positioned at the tail end of the second winding are closed;
and in the third voltage reduction working condition, the voltage reduction alternating current contactor and the terminal alternating current contactor positioned at the tail end of the first winding are closed.
Preferably, the freewheeling contactor unit includes a freewheeling ac contactor and a freewheeling resistor connected in series with the freewheeling ac contactor.
Preferably, further comprising a circuit breaker; the circuit breaker is connected with the follow current alternating current contactor in series; the breaker is closed and is in a normally closed state; when the step-up conversion and the step-down conversion are performed, the follow current alternating current contactor is closed.
Preferably, the bypass short-circuit unit comprises two normally closed contactors; the normally closed contactor is connected in parallel with the head end and the tail end of the excitation winding; the normally closed contactor comprises 4 normally closed contacts; and 2 normally closed contactors are repeatedly connected with one phase of the three-phase circuit.
Preferably, the system further comprises a bypass inspection unit; the bypass maintenance unit is a manually operated circuit breaker; the manual circuit breaker is in short connection and is connected in parallel at two ends of the excitation winding; and after the bypass short-circuit unit is disconnected in a power-loss mode, the manual operation breaker is closed to short-circuit the excitation winding.
Preferably, the system further comprises a three-phase alternating current transformer; the three-phase alternating current transformer is connected in series between the power grid and the main induction winding.
Compared with the prior art, the utility model has the advantages that:
1) the three-phase reactor excitation on-load voltage regulation is connected between a power grid and a load in series, the three-phase reactor excitation voltage is regulated through the on-load voltage regulation circuit unit and the control unit, the adjustable potential is superposed on a power supply, the on-load voltage regulation is realized, and a power transformer is not required to be provided with a tapping winding and an on-load tapping switch.
2) When a fault occurs, the bypass maintenance unit can quickly recover power supply;
3) some faults are repaired without stopping the power supply.
Drawings
Fig. 1 is a block diagram of on-load voltage regulation of an OLTC transformer in the prior art;
fig. 2 is a working state diagram of a three-phase reactor excitation on-load voltage regulation system according to an embodiment of the present invention;
fig. 3 is an electrical schematic diagram of the three-phase reactor excitation on-load voltage regulation system according to an embodiment of the present invention.
The system comprises a three-phase power input end 1, a three-phase current transformer 2, a main inductance winding 3, a first winding 4, a second winding 5, a third winding 6, an on-load voltage regulating circuit unit 7, a voltage regulating output end 8, a follow current contactor unit 9, a step-down alternating current contactor 10, a bypass short-circuit unit 11, a special test terminal 12, a step-up alternating current contactor 13, a bypass overhauling unit 14, an OLTC transformer tap switch 15, a three-phase reactor excitation on-load voltage regulating system 16 and a power transformer 17.
Detailed Description
The three-phase reactor excitation on-load tap changer system of the present invention will now be described in greater detail with reference to the drawings, in which preferred embodiments of the present invention are shown, it being understood that those skilled in the art may modify the invention described herein while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
As shown in fig. 1, in the conventional on-load tap-changing method of the OLTC transformer, a tap-changer 15 of the OLTC transformer is placed on a high-voltage winding side of a power transformer, and a voltage ratio is adjusted by switching a high-voltage winding tap-changing terminal of the power transformer 17 through the on-load tap-changer. U shapeoutRepresents the output voltage, UinRepresenting the input voltage, Nm the number of basic turns of the high-voltage input winding, Ku the regulation factor of the OLTC on-load tap-changer, N1Indicating the actual number of turns of the high voltage input winding, N2The number of turns of the secondary low-voltage input winding of the transformer is shown. Voltage relation: n is a radical of1＝Nm*Ku；Uout＝Uin*N2/N1Regulating KuCan control Uout. The OLTC pressure regulating method comprises the following steps: the purpose of regulating voltage is achieved by regulating the turns ratio of the transformer through the tapping switch, and the switch and the transition resistor in the voltage regulating process are directly connected in series between a power grid and a load. In order to realize on-load voltage regulation, the on-load voltage regulation is completed in a mode that a transition resistor is connected firstly through the operation of an on-load tap-changer, the transition resistor bears inter-turn circulation current and all load current for a short time, then a target tapping end of a transformer is connected, and finally the transition resistor is disconnected.
As shown in fig. 2, the utility model discloses a series connection three-phase reactor excitation on-load voltage regulation system 16 carries out three-phase reactor excitation on-load voltage regulation between electric wire netting and load, through adjusting three-phase reactor excitation voltage, superposes adjustable potential on the power, realizes on-load voltage regulation, does not need power transformer to have tap winding and on-load tap switch. U shapeoutRepresents the output voltage, UinThe voltage is input, delta e represents self-inductance potential formed by adjustable excitation of the three-phase reactor, and the amplitude and the polarity of the delta e are adjustable. Voltage relation: u shapeout＝Uin+ Δ e, adjusting Δ e may change Uout. Because the power supply voltage of the excitation winding can be independently designed, the device selection is convenient, and meanwhile, the delta e required to be generated by the three-phase reactor is only 7% of the power grid voltage, the capacity of the reactor, the working voltage of the excitation winding and the control device of the excitation loop are low, and the current is small.
As shown in fig. 3, the specific structure of the three-phase reactor excitation on-load voltage regulation system is as follows: the device comprises a three-phase reactor and an on-load voltage regulating circuit unit 7; the three-phase reactor comprises a main induction winding 3 and an excitation winding; the main induction winding 3 is connected in series between the load and the power grid; in addition, the exciting winding is additionally arranged on the iron core of the reactor, the same-frequency and same-phase voltage is loaded on the exciting winding, the polarity is changed by switching the current direction of the head end and the tail end of the exciting winding, and the corresponding self-induction potential (delta e) and the power supply voltage (U) of the power grid are obtained on the main induction winding 3in) Superposed self-inductance potential (delta e) becomes UoutSupplying power to the load, namely: u shapein+Δe＝Uout(ii) a In consideration of the feasibility of the scheme and the convenience of future product design, in the embodiment, the power grid power supply is directly used as the excitation power supply, so that the voltage type selection of the alternating current contactor is facilitated, and the design of the three-phase reactor is facilitated. As the excitation power supply, a three-phase 0.4KV power supply can be selected, and a three-phase 0.66KV or 1.140KV power supply can also be selected, the voltage grades belong to low-voltage power supplies, and meanwhile, the excitation power supply is matched with an adaptive alternating current contactor, so that the excitation power supply can be directly obtained from a power grid, and can also be obtained by boosting through a small-capacity three-phase power supply transformer. Thus, the design and the selection can be convenient. The on-load voltage regulating circuit unit 7 comprises a step-down alternating current contactor 10, a step-up alternating current contactor 13, two-terminal alternating current contactors, a follow current contactor unit 9 and a bypass short-circuit unit 11; the step-down alternating current contactor 10, the step-up alternating current contactor 13 and the two-terminal alternating current contactors KM1 and KM4 are used for distributing excitation voltage to different excitation winding taps to adjust excitation magnetic flux; the bypass short-circuit unit 11 and the follow current contactor unit 9 are respectively connected with the excitation winding in parallel; in the process of switching the terminal alternating-current contactor, the follow-current contactor unit 9 is firstly closed by the follow-current contactor unit 9, and then the follow-current contactor unit 9 is disconnected after the terminal alternating-current contactor completes switching. In the process of on-load voltage regulation, the main flux of the excitation winding of the three-phase reactor must be kept controlled, so that the follow current contactor unit 9 has the function of ensuring that the excitation winding does not cut off in the process of switching the power supply of the excitation winding; bypass short-circuit sheetThe role of element 11 is: if current flows through the main induction winding 3, the excitation winding must have corresponding current to inhibit magnetic flux, otherwise, the excitation winding becomes a boost winding, so that the bypass short-circuit unit 11 needs to be selected to short-circuit the end of the excitation winding, and the excitation winding is kept as a passage; the step-down alternating current contactor 10(KM01) is respectively communicated with the tail end of the main induction winding 3 and the head end of the excitation winding; the boosting alternating current contactor 13(KM02) is respectively communicated with the head end of the main induction winding 3 and the tail end of the excitation winding; the terminal alternating current contactors KM1 and KM4 are respectively connected in series and in short with the head end and the tail end of the excitation winding; during the state of stepping up, step-down ac contactor 10(KM01) disconnection, with step-up ac contactor 13(KM02) closure, the terminal ac contactor KM4 of excitation winding head end is closed in order to communicate the excitation circuit, send into excitation power by excitation winding's tail end, can realize the voltage boost, during the state of stepping down, step-up ac contactor 13(KM02) disconnection, step-down ac contactor 10(KM01) closure, the terminal ac contactor KM1 of excitation winding tail end is closed in order to realize intercommunication excitation circuit, send into excitation power by excitation winding's head end, can realize the voltage reduction.
In the embodiment, the excitation winding is further designed into three sections, and comprises a first winding 4, a second winding 5 and a third winding 6 which are sequentially connected in series; the head end of the second winding 5 is communicated with the tail end of the first winding 4; the tail end of the second winding 5 is communicated with the head end of the third winding 6; the tail end of the first winding 4 and the tail end of the second winding 5 are respectively connected with a terminal alternating current contactor KM3 and a terminal alternating current contactor KM2 in series; namely, each phase of excitation winding in the three-phase reactor is provided with three taps, and a head end and a tail end are added, each phase of excitation winding has 4 ends, and the three phases have 12 ends. This part of the control selects four-terminal ac contactors having component identifiers KM1, KM2, KM3, KM 4.
In the embodiment, the number of turns per unit value of the main induction winding 3 is 1, and the head ends of the terminals with the same name of the main induction winding 3, namely the terminal numbers A-a, B-B and C-C, are designed on one side of the winding A, B, C; the number of turns per unit value of the first winding 4 is 13.28, and the number of the terminals of the first winding 4 is x 4-x 3, y 4-y 3 and z 4-z 3 dotted terminal ends are designed on one side of the windings x4, y4 and z 4; the number of per unit winding number of the second winding 5 is 5.72, and the terminals of the second winding 5 with the numbers of x 3-x 2, y 3-y 2 and z 3-z 2 are designed on one side of windings x3, y3 and z 3; the number of turns per unit value of the third winding 6 is 13.3, and the terminals of the third winding 6 are numbered from x2 to x1, from y2 to y1 and from z2 to z1 and are designed on the sides of the windings x2, y2 and z 2.
In the embodiment, the three-phase reactor is used for exciting the voltage regulation output end 8 and connecting various three-phase or single-phase loads; the three-phase power input end 1 is used for connecting a three-phase power supply of a power grid.
In this embodiment, the boosting state includes a first boosting condition, a second boosting condition, and a third boosting condition; when the first boosting working condition is adopted, the boosting alternating current contactor 13KM02 and the terminal alternating current contactor KM4 positioned at the head end of the excitation winding are closed, and the output voltage is equal to 103% of the input voltage; under the second boosting working condition, the boosting alternating current contactor 13(KM02) and the terminal alternating current contactor KM3 positioned at the tail end of the first winding 4 are closed, so that the output voltage is equal to 105% of the input voltage; under the third boosting working condition, the boosting alternating current contactor 13KM02 and the terminal alternating current contactor KM2 positioned at the tail end of the second winding 5 are closed, and the output voltage is equal to 107% of the input voltage; correspondingly, the pressure reduction state comprises a first pressure reduction working condition, a second pressure reduction working condition and a third pressure reduction working condition; when the first voltage reduction working condition is adopted, the voltage reduction alternating current contactor 10(KM01) and the terminal alternating current contactor KM1 positioned at the tail end of the excitation winding are closed, so that the output voltage is equal to 97% of the input voltage; under the second step-down working condition, the step-down alternating current contactor 10(KM01) and the terminal alternating current contactor KM2 positioned at the tail end of the second winding 5 are closed, so that the output voltage is equal to 95% of the input voltage; under the third step-down working condition, the step-down alternating current contactor 10(KM01) and the terminal alternating current contactor KM3 positioned at the tail end of the first winding 4 are closed, so that the output voltage is equal to 93% of the input voltage; the excitation winding is short-circuited end to end, so that the self-induction potential of the main inductor of the three-phase reactor can be eliminated, namely: u shapein＝UoutA functional voltage regulation step 0%, i.e. a bypass function, is formed, the input supply voltage being equal to the output voltage.
In the present embodiment, the freewheeling contactor unit 9 includes a freewheeling ac contactor KM5 and freewheeling resistors R1, R2, R3 connected in series with the freewheeling ac contactor, and a resistor housing of the freewheeling resistor mounts the temperature switch. The model selection calculation principle of the free-wheeling resistors R1, R2 and R3 is as follows: when the three-phase reactor flows through load rated current, the capacity required by the maximum self-inductance potential of the reactor is calculated (only the load capacity is 7%), the line voltage is assumed to be 400V, the voltage loaded on the resistor is only 154V, if the load capacity is 1000KVA at the moment, the resistance value is 4.3-4.7 omega, the current flowing on the resistor is 44.07A, and the resistor belongs to a short-time working system, and the time of the reactor participating in operation is very short, namely about 200 milliseconds, so that the reactor can negotiate with a resistor manufacturer to select. Considering the possibility of the failure of the resistor, in order to facilitate the on-line replacement without power failure, a breaker QF4 with an electromagnetic shunt function is additionally arranged; the breaker QF4 is connected with a follow current alternating current contactor KM5 in series; the circuit breaker QF4 is normally in a closed state, and when the freewheeling resistors R1, R2 and R3 are over-temperature, the circuit breaker QF4 is shunt-excited and disconnected, and meanwhile, an alarm signal is sent out. The freewheeling ac contactor KM5 is closed for a short time during the excitation regulation process to maintain the excitation current in the excitation winding. When the excitation regulation is finished, the freewheeling ac contactor KM5 is turned off.
In the present embodiment, the bypass short-circuit unit 11 includes two normally-closed contactors KM6 and KM 61; the two normally-closed contactors KM6 and KM61 are connected in parallel at the head end and the tail end of the excitation winding, and each of the normally-closed contactors KM6 and KM61 comprises 4 normally-closed contacts; and 2 normally closed contactors are repeatedly connected with one phase of the three-phase circuit. Further, the contactor with the normally closed main contact is selected to short the excitation winding end to end, and the KM6 and the KM61 are always closed in the load voltage regulation process. Because the existing normally-closed contactor only has two groups of main contacts, the two contactors of KM6 and KM61 are selected for combined use, and the actual function is the same contactor function. In order to meet the requirement of a three-phase loop, the two contactors are connected in parallel for use and are used for eliminating self-inductance potential of the reactor and realizing a bypass function.
Considering that the utility model belongs to the power transformation and distribution equipment, which has the function of rapidly recovering power supply after failure, a bypass maintenance unit 14 is additionally arranged; bypass overhaul sheetElement 14 is a hand-operated breaker QF 5; the manual circuit breaker QF5 is in short circuit and is connected in parallel at two ends of the excitation winding; after the bypass short-circuit unit 11 is disconnected, the hand-operated circuit breaker is closed to short-circuit the excitation winding. Specifically, when a fault occurs, only the equipment control power supply is disconnected, the phenomenon that a coil of a normally-closed contactor in the bypass short-circuit unit is attracted by an electric contact is avoided, in this state, the manual breaker QF5 is switched on by hand, the excitation winding is in end-to-end short circuit, the main inductive potential of the three-phase reactor is eliminated, all contactors of the voltage regulating system can be maintained on line under the condition that the excitation power supply is not loaded, the switch-on QF5 can rapidly supply power to a load, the function is called bypass maintenance, and therefore the three-phase reactor is in a disconnection position in a normal state. After the control circuit power supply is disconnected, the circuit breaker is switched on by hand, the circuit breaker enables the excitation winding to be short-circuited end to end, the induced potential delta e of the main inductance of the three-phase reactor is 0, and the self-inductance potential of the main inductance of the three-phase reactor is eliminated, namely: u shapein＝UoutA functional voltage regulation step of 0% is formed, the input voltage being equal to the output voltage. Under the bypass maintenance state, the control power supply of the equipment can be disconnected, the equipment maintenance is carried out, the load power failure cannot occur, and the purpose of maintaining some faults under the condition of not stopping power supply is achieved.
In the present embodiment, a three-phase ac transformer 2 is further included; the three-phase ac transformer 2 is connected in series between the grid and the main inductive winding 3.
In the present embodiment, a dedicated test terminal 12 for connecting the three-phase current transformer 2 and the digital electric energy meter is further included. In order to avoid the secondary open circuit of the current transformer when the electric energy meter is replaced, the X2 terminal needs to be closed, the transformer can be protected, and the electric energy meter can be replaced without power outage.
The utility model discloses on the principle basis, utilize (MCU) singlechip or Programmable Logic Controller (PLC) to gather and come from electric wire netting electric quantity (including data such as voltage, electric current, power factor, active power, reactive power, active electric energy) data to and the electric quantity data of output, write corresponding control software and can realize output voltage automatically regulated control. The utility model discloses an engineering machine actual effect of implementation stage experience scheme design, model test, many money capacity is verified, adds current transformer, intelligent digital electric energy meter, voltage transmitter, Programmable Logic Controller (PLC), human-computer interface (HMI), and the collocation of rethread software programming and configuration has realized that three-phase reactor excitation on-load voltage regulation mode is automatic.
The working process of the utility model is as follows:
1) a bypass state: namely: at 0%, the contactors KM6 and KM61 were closed, and the output voltage was equal to 100% of the input voltage.
2) Follow current: in order to ensure that the switching process of the excitation winding does not generate current interruption, on the premise that the QF4 is switched on, the contactor KM5 is closed, the contactor KM5 is kept closed in the process that the excitation winding is switched, and the contactor KM5 is disconnected until the switching process is finished.
3) -3% reduced pressure state: i.e. -3%, the contactors KM01, KM1 were closed, the output voltage being equal to 97% of the input voltage.
4) -5% reduced pressure state: i.e. -5%, the contactors KM01, KM2 were closed, the output voltage being equal to 95% of the input voltage.
5) -7% reduced pressure state: i.e. -7%, the contactors KM01, KM3 were closed, the output voltage being equal to 93% of the input voltage.
6) + 3% boost state: i.e. + 3%, the contactors KM02, KM4 are closed and the output voltage equals 103% of the input voltage.
7) + 5% boost state: i.e. + 5%, the contactors KM02, KM3 are closed and the output voltage equals 105% of the input voltage.
8) + 7% boost state: i.e. + 7%, contacts KM02, KM2 are closed and the output voltage equals 107% of the input voltage.
9) Bypass maintenance state: no contactor is used, no voltage output is realized through a closing circuit breaker QF5, and the output voltage is equal to 100% of input voltage. The equipment is automatically switched to a bypass state due to faults or because of regulated voltage, KM6 and KM61 are closed, a breaker QF5 is switched on, the breaker QF5 replaces a bypass short-circuit unit 11 to keep the end-to-end short circuit of an excitation winding of the three-phase reactor, the output voltage is equal to 100% of input voltage, and the three-phase reactor excitation on-load voltage regulating equipment does not need a follow-current contactor unit 9 to maintain the reactor excitation current. Therefore, as long as the breaker QF5 is kept closed, the power supply to the load can be uninterrupted, and therefore, the equipment control power supply can be disconnected, and the equipment can be repaired and the parts can be replaced.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (7)
1. A three-phase reactor excitation on-load voltage regulation system is characterized by comprising a three-phase reactor and an on-load voltage regulation circuit unit; the three-phase reactor comprises a main induction winding and an excitation winding; the on-load voltage regulating circuit unit comprises a step-down alternating current contactor, a step-up alternating current contactor, two terminal alternating current contactors, a follow current contactor unit and a bypass short-circuit unit;
the main induction winding is connected in series between a load and a power grid; the excitation winding is respectively connected with the bypass short-circuit unit and the follow current contactor unit in parallel; the follow current contactor unit is closed before the terminal alternating current contactor is switched in the process of switching the terminal alternating current contactor, and then is disconnected after the terminal alternating current contactor finishes switching;
the step-down alternating current contactor is respectively communicated with the tail end of the main induction winding and the head end of the excitation winding;
the boosting alternating current contactor is respectively communicated with the head end of the main induction winding and the tail end of the excitation winding;
the terminal alternating current contactors are respectively short-circuited at the head end and the tail end of the excitation winding;
in a boosting state, the voltage reduction alternating current contactor and the terminal alternating current contactor at the tail end of the excitation winding are disconnected; the step-up alternating current contactor is closed, and the terminal alternating current contactor at the head end of the excitation winding is closed to communicate with the excitation loop;
when the voltage is reduced, the boosting AC contactor and the terminal AC contactor at the head end of the excitation winding are disconnected; and the step-down alternating current contactor is closed, and the terminal alternating current contactor at the tail end of the excitation winding is closed to communicate with the excitation loop.
2. The three-phase reactor excitation on-load voltage regulation system according to claim 1, wherein the excitation winding comprises a first winding, a second winding and a third winding which are connected in series in sequence;
the head end of the second winding is communicated with the tail end of the first winding; the tail end of the second winding is communicated with the head end of the third winding;
and the tail end of the first winding and the tail end of the second winding are respectively connected with a terminal alternating current contactor in series.
3. A three-phase reactor excitation on-load voltage regulation system according to claim 1 wherein the freewheeling contactor unit comprises a freewheeling ac contactor and a freewheeling resistor in series with the freewheeling ac contactor.
4. The three-phase reactor excitation on-load tap changing system according to claim 3, further comprising a circuit breaker; the circuit breaker is connected with the follow current alternating current contactor in series; the breaker is closed and is in a normally closed state; when the step-up conversion and the step-down conversion are performed, the follow current alternating current contactor is closed.
5. The three-phase reactor excitation on-load voltage regulation system according to claim 1, wherein the bypass short-circuit unit comprises two normally closed contactors; the normally closed contactor is connected in parallel with the head end and the tail end of the excitation winding; the normally closed contactor comprises 4 normally closed contacts; and 2 normally closed contactors are repeatedly connected with one phase of the three-phase circuit.
6. The three-phase reactor excitation on-load tap changer system of claim 1, further comprising a bypass repair unit; the bypass maintenance unit is a manually operated circuit breaker; the manual circuit breaker is in short connection and is connected in parallel at two ends of the excitation winding; and after the bypass short-circuit unit is disconnected in a power-loss mode, the manual operation breaker is closed to short-circuit the excitation winding.
7. The three-phase reactor excitation on-load tap changer system of claim 1, further comprising a three-phase ac transformer; the three-phase alternating current transformer is connected in series between the power grid and the main induction winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109921428A (en) * | 2019-04-08 | 2019-06-21 | 上海国祺能源有限公司 | A kind of three-phase reactor excitation on-load voltage regulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109921428A (en) * | 2019-04-08 | 2019-06-21 | 上海国祺能源有限公司 | A kind of three-phase reactor excitation on-load voltage regulation system |
| CN109921428B (en) * | 2019-04-08 | 2023-08-01 | 上海国祺能源有限公司 | Three-phase reactor excitation on-load voltage regulating system |
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