CN112909910A - Arc extinction method and device for ground fault of power distribution network - Google Patents
Arc extinction method and device for ground fault of power distribution network Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a power distribution network ground fault arc extinction method and a device thereof, wherein the method comprises the following steps: s1: two terminals on one side of the voltage regulator are respectively connected with 2 terminals led out from the secondary side of the Z-shaped grounding transformer to obtain voltage opposite to the voltage of a neutral point relative to a fault, and the voltage of the fault phase is suppressed to be lower than arc quenching voltage after being boosted by the boosting transformer; the Z-type grounding transformer is connected into a power distribution network, the terminal of a neutral point O and a secondary side A, B, C three-phase lead-out wiring are formed by star connection of the tail end of a phase-shifting winding of the Z-type grounding transformer, the terminal led out of the secondary side is selectively connected with the terminal on one side of a voltage regulator, the terminal on the other side of the voltage regulator is electrically connected with a step-up transformer, and the other side of the step-up transformer is electrically connected with the neutral point O. The device and the method can effectively restrain the fault phase voltage below the arc extinction voltage so as to extinguish the fault point arc, and meanwhile, the voltage applied to the neutral point is taken from the power distribution network, so that an additional power supply is not needed, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of power distribution network fault processing, and particularly relates to a power distribution network ground fault arc extinction method and device.
Background
The 6-66kV power distribution network in China is complex in topological structure and closely connected with users, and single-phase earth faults of the power distribution network frequently occur due to influences of the surrounding environment of lines, the terrain and the like, and account for more than 85% of the total fault proportion of the power distribution network. When a single-phase earth fault occurs, a fault point has larger fault current to cause fault electric arcs, and the intermittent reignition of the electric arcs is easy to cause overvoltage, so that equipment is burnt and even personnel are injured and killed if the electric arcs are not timely treated. Therefore, the distribution network in China generally adopts an arc suppression coil grounding mode, and the capacitive current in the fault current is compensated, so that the fault current is reduced and arcing is prevented. At the initial stage of the construction of the power distribution network, because the capacitance current to the ground and the conductive current to the ground of the power grid are small, the single-phase grounding fault current can be effectively reduced to be below the arc extinguishing current by the arc extinguishing coil, and most grounding arcs can be automatically extinguished. However, with the continuous expansion of the power distribution network and the increase of the cable lines, the active current and harmonic current content in the fault current is increased and cannot be effectively compensated by the arc suppression coil, so that the fault point electric arc cannot be extinguished automatically, and the safe power supply of the power distribution network is seriously influenced. The reliable arc extinction of the power distribution network ground fault is beneficial to further improving the safety and reliability of the power distribution network, and the construction level of intelligent power distribution networks in China is promoted.
The existing arc extinguishing method comprises the following steps: one is the conventional method of using an arc suppression coil to extinguish the arc. An arc suppression coil is additionally arranged at a neutral point of a power distribution network, and inductive current is generated by the arc suppression coil to compensate point capacitive current of a fault point, so that the method is most widely applied. However, in this method, since the inductance value of the arc suppression coil cannot be continuously adjusted to match the capacitance current of the power distribution network, the arc suppression effect of the fault point is not controlled, and active and harmonic components in the fault current cannot be compensated, and other methods are often required to be assisted to compensate the active and harmonic components in the fault current; another method is an active arc extinction method using power electronics technology. After a fault occurs, a power electronic power supply is used for injecting zero sequence current into a neutral point to flexibly regulate and control fault phase voltage, so that fault arc extinction is realized. However, this method requires additional power electronic equipment and independent power supply equipment, the regulation and control process of the injected current is complex, the stability and reliability are difficult to guarantee, the cost of the power electronic equipment is high, and only a small part of the power distribution network is adopted.
In view of the above problems, it is desirable to provide a reliable arc quenching circuit that does not require an additional independent power supply device, is lower in cost, and can effectively suppress a fault voltage to be lower than an arc quenching voltage, thereby achieving a fault point.
Disclosure of Invention
The invention aims to provide a power distribution network ground fault arc extinction method and a device thereof, which can suppress the voltage of a fault phase-to-ground to be lower than the arc extinction voltage so as to extinguish the fault point arc, does not need to add an independent power supply in the period, has low cost, does not need to consider the influence of the power distribution network ground capacitance on the power supply capacity, and is not influenced by the power distribution network capacity in application.
In one aspect, the invention provides a power distribution network ground fault arc extinction method, which comprises the following steps: s1: two terminals on one side of the voltage regulator are respectively connected with 2 terminals led out from the secondary side of the Z-shaped grounding transformer to obtain voltage opposite to the voltage of a neutral point relative to a fault, and the voltage of the fault phase is suppressed to be lower than arc quenching voltage after being boosted by the boosting transformer;
the Z-type grounding transformer is connected into a power distribution network, the terminal of the neutral point O and the terminal of the secondary side A, B, C three-phase lead-out wiring are formed by the star connection of the tail end of the phase-shifting winding of the Z-type grounding transformer, the terminal led out of the secondary side is selectively connected with the terminal on one side of the voltage regulator, the terminal on the other side of the voltage regulator is electrically connected with the step-up transformer, one end of the other side of the step-up transformer is electrically connected with the neutral point O, and the other end of.
The arc extinction method provided by the invention can effectively inhibit the voltage of the fault phase from being inhibited below the arc extinction voltage, reliably extinguish the arc of the fault point, and the voltage applied to the neutral point is taken from a power distribution network, so that an additional utilization or an additional independent power supply is not needed, and the cost is lower. "C (B)
Further preferably, the step S1 specifically includes: determining the connection relation between two terminals at one side of the voltage regulator and the terminal led out from the secondary side according to the fault phase and the wiring mode of the Z-shaped grounding transformer, and comprising the following steps:
if the wiring mode of the Z-type grounding transformer is ZNY11, one terminal on one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal leading by 120 degrees of a fault phase in the terminals led out from the secondary side;
if the wiring mode of the Z-type grounding transformer is ZNY1, one terminal of one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal lagging by 120 degrees for a fault phase in the terminals led out from the secondary side.
More preferably, the primary side and the secondary side of the Z-type grounding transformer have a transformation ratio of N1:N2The transformation ratio of the initial state of the voltage regulator is
The step-up transformer has a transformation ratio of
Further preferably, after the step S1 is executed, the method further includes the steps of:
s2: delaying for a preset time t;
s3: continuously changing the transformation ratio of the voltage regulator, monitoring whether a zero sequence admittance phase angle of the power distribution network changes, and if the zero sequence admittance phase angle changes along with the transformation ratio change of the voltage regulator, the fault does not disappear; and if the zero sequence admittance phase angle does not change along with the change ratio change of the voltage regulator, the fault disappears.
Further preferably, if the fault does not disappear, the transformation ratio of the voltage regulator is restored to the initial state, and the ground fault is waited for processing;
and if the zero sequence admittance phase angle does not change along with the change ratio of the voltage regulator, disconnecting the voltage regulator from the Z-shaped grounding transformer, restoring the change ratio of the voltage regulator to an initial state, and enabling the power distribution network to normally run if the fault disappears.
The invention finds that when the fault is not eliminated, the zero sequence admittance phase angle of the power distribution network changes along with the transformation ratio of the transformer; when the fault disappears, the zero sequence admittance phase angle of the power distribution network is irrelevant to the transformation ratio, so that the zero sequence admittance phase angle is not changed along with the transformation ratio of the transformer. Therefore, based on the research, the invention sets an autonomous identification mechanism for whether the fault disappears, and can actively identify whether the fault disappears. In particular to the prior arc extinction mode: the use of a switching device forces the suppression of the faulted phase voltage to 0. The typical application of the method is 'arc suppression cabinet', after a fault occurs, a breaker is adopted to directly short circuit a ground fault phase at a bus, and the voltage of the fault phase is suppressed to be 0, so that the arc suppression effect of the ground fault is realized, the switch is turned off after the bus is short-circuited for a certain time, if the fault disappears, the switch is restored to normal, otherwise, the switch is turned on again to wait for fault treatment. For permanent faults, the method needs to continuously ground the bus twice, so that impact is caused to an original fault point, and the delay in the secondary grounding period even causes further expansion of the fault, which is not beneficial to system safety. The invention processes by changing the transformation ratio of the voltage regulator, so that the neutral point voltage can be smoothly reduced in the process of identifying the disappearance of the fault, the condition that the fault current is suddenly increased due to sudden increase of the fault phase voltage can not occur, and the further expansion of the fault can not be caused. "C (B)
Preferably, the voltage regulator is provided with a carbon brush, and the carbon brush can slide along the surface of the coil of the voltage regulator to change the transformation ratio of the voltage regulator.
Further preferably, the ratio of the voltage regulator after being changed is represented as:
k is a proportionality coefficient, and k is more than or equal to 0 and less than or equal to 1.
Further preferably, the terminals of two wires led out from each of the three phases of the secondary side A, B, C of the Z-type grounding transformer form two groups of terminals, each group of terminals includes three terminals, and the three terminals respectively correspond to the A, B, C three phases;
the two terminals on one side of the voltage regulator respectively correspond to one group of terminals and are respectively selectively connected in the corresponding group of terminals.
Further preferably, one side of the step-up transformer is electrically connected with the voltage regulator, one terminal on the other side is grounded, and the other terminal is connected with a neutral point O.
In a second aspect, the present invention provides a power distribution network ground fault arc extinction device, including: the Z-type grounding transformer is connected to a power distribution network, the tail ends of phase-shifting windings of the Z-type grounding transformer are connected in a star mode to form a neutral point O, and terminals of A, B, C three-phase leading-out wires on the secondary side are connected selectively with terminals on one side of the voltage regulator, terminals on the other side of the voltage regulator are electrically connected with the boosting transformer, one end of the other side of the boosting transformer is electrically connected with the neutral point O, and the other end of the boosting transformer is connected with the ground end;
when the fault is extinguished, two terminals on one side of the voltage regulator are respectively connected with 2 terminals led out from the secondary side of the Z-shaped grounding transformer to obtain voltage opposite to the neutral point voltage of the fault, and the voltage of the fault phase is suppressed to be lower than the arc extinguishing voltage after being boosted by the boosting transformer.
Further preferably, when the wiring mode of the Z-type grounding transformer is ZNY11 during fault arc extinction, one terminal on one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal leading by 120 ° in fault phase in the terminals led out from the secondary side;
if the wiring mode of the Z-type grounding transformer is ZNY1, one terminal at one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal lagging by 120 degrees of a fault phase in the terminals led out from the secondary side;
the transformation ratio of the primary side and the secondary side of the Z-shaped grounding transformer is N1:N2Said voltage regulatorThe transformation ratio of the initial state is
The step-up transformer has a transformation ratio of
Preferably, the voltage regulator is provided with a carbon brush, and the carbon brush can slide along the surface of the coil of the voltage regulator to change the transformation ratio of the voltage regulator.
Advantageous effects
The invention provides a power distribution network ground fault arc extinction method, which leads out a terminal on each phase of the low-voltage side of a Z-shaped grounding transformer, obtains a voltage opposite to the voltage of a neutral point of a fault by connecting two ends of a voltage regulator with corresponding phases in the terminals of the Z-shaped grounding transformer, restrains the voltage of the fault phase to be below the arc extinction voltage after further boosting through a boosting transformer to realize ground fault arc extinction.
Drawings
FIG. 1 is a schematic diagram of a power distribution network ground fault arc suppression system provided by an embodiment of the present invention;
fig. 2 is a schematic flow chart of a power distribution network ground fault arc extinction method provided by an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
the system for applying the arc extinction method for the ground fault of the power distribution network provided by the embodiment of the invention is shown in figure 1,
three-phase voltage to ground for distribution grid A, B, C; g is the relative earth conductance of the distribution network; c is the relative ground capacitance of the power distribution network; rfIs a transition resistance; y isOGrounding admittance for neutral point;
zero sequence current of the power distribution network;
is a fault current; t is1The transformer is a Z-type grounding transformer, the wiring form is ZNY11, the primary side of the Z-type grounding transformer is formed by reversely connecting coils with the same number of turns and the same winding direction in series, the tail ends of phase-shifting windings are connected in star to form a neutral point O, and the neutral point O is connected in series with a grounding admittance YnThe back of the reactor is grounded,
a, B, C three-phase voltage of Z-type grounding transformer phase-shifting winding, and the transformation ratio of primary side to secondary side is N1:N2，x1、x2(x ═ a, b, c) are respectively two terminals of a three-phase lead-out of the secondary side A, B, C of the Z-type grounding transformer,
a, B, C three-phase voltage output by the secondary side of the Z-shaped grounding transformer; t is2Is a voltage regulator, the transformation ratio is
The regulator has a carbon brush slidable along the surface of the coil to continuously change the transformation ratio, which can be expressed as
Wherein k is more than or equal to 0 and less than or equal to 1; t is3Being a step-up transformer, the step-up transformer has a transformation ratio of
It should be noted that the grounding method of the Z-type grounding transformer in the present embodiment is ZNY11, but the wiring method in other possible embodiments is not limited thereto, such as ZNY 1. And other possible embodiments are not limited to the secondary side A, B, C three-phase outgoing 2 sets of terminals of the Z-type grounding transformer, for example, 1 or more sets may implement the concept of the present invention.
Based on the system structure in this embodiment, the voltage of the primary winding and the phase-shift winding of the Z-type grounding transformer have the following relationship:
three-phase voltage of secondary side of Z-type grounding transformer
Comprises the following steps:
the voltages of the three phases of the power distribution network to the neutral point O are respectively as follows:
wherein,
three-phase to neutral point voltages of the power distribution network are respectively;
is a directional operator, representing a 330 ° counterclockwise rotation;
respectively represents the three-phase power electromotive force of the power distribution network, the three are equal in size,
advance in
120°，
Hysteresis
120°。
When two ends K of the voltage regulator1And K2When connecting to the terminals in the first and second groups of the secondary side of the Z-type grounding transformer, respectively, the following connection forms exist in this embodiment: c. C1+a2、a1+b2And b1+c2Corresponding to the low-voltage side voltage of the voltage regulator
Comprises the following steps:
high side voltage of voltage regulator
Comprises the following steps:
via step-up transformer T3After boosting, the corresponding neutral point voltage
Comprises the following steps:
when the carbon brush of the voltage regulator is in the original position, k is 1, the output voltage of the high-voltage side of the voltage regulator is the maximum, and the voltage of the neutral point is the maximum.
When the A phase of the power distribution network has single-phase earth fault, the fault current is as follows:
two ends K of the voltage regulator1And K2Connecting the C-phase of the first set of terminals and the A-phase of the second set of terminals, i.e. K, respectively1And K2Are respectively connected to c1And a2At this time, the carbon brush of the voltage regulator is at the original position (k is 1), and as can be seen from equations (3) and (6), the voltage to ground of a at this time is:
from the formulas (7) and (8), when the A phase has single-phase earth fault, the two ends K of the voltage regulator are connected1And K2Are respectively connected to c1And a2The fault current will be suppressed to 0, thereby achieving fault extinction.
Similarly, the carbon brush of the voltage regulator is slid to the original position, and when the B phase has single-phase earth fault, the two ends K of the voltage regulator are connected1And K2Are respectively connected to a1And b2The fault current full compensation can be realized; when single-phase earth fault occurs to C phase, two ends K of the voltage regulator are connected1And K2Are respectively connected to b1And c2Therefore, the fault current full compensation can be realized.
In summary, when the wiring mode of the Z-type grounding transformer is ZNY11, two ends K of the voltage regulator are connected to each other1And K2One is connected with the corresponding terminal with the fault in the terminals led out from the secondary side, and the other is connected with the corresponding terminal with the fault phase advanced by 120 degrees in the terminals led out from the secondary side; in other possible embodiments, when the connection mode of the Z-type grounding transformer is ZNY11, the two ends K of the voltage regulator1And K2One of the terminals connected to the secondary side lead out is connected to the terminal corresponding to the fault, and the other is connected to the terminal corresponding to the terminal lagging behind the fault phase by 120 degrees.
After the fault current is fully compensated and a certain time t is delayed, sliding a carbon brush of a voltage regulator, monitoring whether a zero sequence admittance phase angle of the power distribution network changes or not, if the zero sequence admittance phase angle does not change, judging that the fault disappears, restoring each switch and the carbon brush to the original position, and restoring the normal operation of the power distribution network; otherwise, the carbon brush is restored to the original position, the arc extinction of the ground fault is continued, and the fault processing is waited.
And the zero sequence admittance of the power distribution network is the ratio of the zero sequence current of the power distribution network to the neutral point voltage.
Suppose that
When a phase has single-phase earth fault, the voltage of the neutral point is regulated by the voltage regulator
When the fault does not disappear, the zero sequence admittance of the power distribution network is as follows:
the zero sequence admittance phase angle of the power distribution network when the fault does not disappear is as follows:
after the power distribution network fault disappears, the zero sequence admittance of the power distribution network is as follows:
the zero sequence admittance phase angle of the power distribution network after the fault disappears is as follows:
as can be seen from the formulas (10) and (12), when the fault does not disappear, the zero sequence admittance phase angle of the power distribution network changes along with the movement of the carbon brush of the voltage regulator; when the fault disappears, the zero sequence admittance phase angle of the power distribution network is irrelevant to the position of the carbon brush of the voltage regulator, so that the zero sequence admittance phase angle is not changed along with the movement of the carbon brush of the voltage regulator. And the change of the movement of the carbon brush of the voltage regulator is the transformation ratio of the voltage regulator, which is related to k, so the following conclusion can be reached: if the zero sequence admittance phase angle changes along with the change ratio change of the voltage regulator, the fault does not disappear; and if the zero sequence admittance phase angle does not change along with the change ratio change of the voltage regulator, the fault disappears.
Based on the above principle reasoning, the method provided by the embodiment of the invention comprises the following steps:
1) connecting terminals x at two ends of the voltage regulator respectively according to fault phases1And y2Wherein y is the phase corresponding to the fault, and x is the phase corresponding to the leading fault phase by 120 degrees;
2) delaying for a certain time t;
3) the sliding voltage regulator carbon brush changes the neutral point voltage;
4) monitoring whether a zero sequence admittance phase angle of the power distribution network changes;
5) if the zero sequence admittance phase angle changes, restoring the carbon brush of the voltage regulator to the original position, and waiting for the ground fault treatment;
6) if the zero sequence admittance phase angle is not changed, the connection between the voltage regulator and the Z-shaped grounding transformer is disconnected, the carbon brush is restored to the original position, and the power distribution network is restored to normal operation.
In some embodiments, the step 1) is performed such that the faulted phase voltage is suppressed below the arc-quenching voltage.
In some embodiments, other adjustable ratio regulators may be selected.
In conclusion, the ground fault arc suppression system provided by the method and the device for matching the self-power taking of the power distribution network and the stepless voltage regulation of the voltage regulator can effectively suppress the fault phase voltage below the arc suppression voltage and can actively identify whether the fault disappears. The voltage applied to the neutral point is taken from the power distribution network, and no independent power supply equipment is required to be added.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the invention is not to be limited to the examples described herein, but rather to other embodiments that may be devised by those skilled in the art based on the teachings herein, and that various modifications, alterations, and substitutions are possible without departing from the spirit and scope of the present invention.
Claims (10)
1. An arc extinction method for a power distribution network ground fault is characterized by comprising the following steps: the method comprises the following steps: s1: two terminals on one side of the voltage regulator are respectively connected with 2 terminals led out from the secondary side of the Z-shaped grounding transformer to obtain voltage opposite to the voltage of a neutral point relative to a fault, and the voltage of the fault phase is suppressed to be lower than arc quenching voltage after being boosted by the boosting transformer;
the Z-type grounding transformer is connected into a power distribution network, the terminal of the neutral point O and the terminal of the secondary side A, B, C three-phase lead-out wiring are formed by the star connection of the tail end of the phase-shifting winding of the Z-type grounding transformer, the terminal led out of the secondary side is selectively connected with the terminal on one side of the voltage regulator, the terminal on the other side of the voltage regulator is electrically connected with the step-up transformer, one end of the other side of the step-up transformer is electrically connected with the neutral point O, and the other end of.
2. The method of claim 1, wherein: the specific process of step S1 is: determining the connection relation between two terminals at one side of the voltage regulator and the terminal led out from the secondary side according to the fault phase and the wiring mode of the Z-shaped grounding transformer, and comprising the following steps:
if the wiring mode of the Z-type grounding transformer is ZNY11, one terminal on one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal leading by 120 degrees of a fault phase in the terminals led out from the secondary side;
if the wiring mode of the Z-type grounding transformer is ZNY1, one terminal of one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal lagging by 120 degrees for a fault phase in the terminals led out from the secondary side.
3. The method of claim 1, wherein: after step S1 is executed, the method further includes the following steps:
s2: delaying for a preset time t;
s3: continuously changing the transformation ratio of the voltage regulator, and monitoring whether the zero sequence admittance phase angle of the power distribution network changes;
if the zero sequence admittance phase angle changes along with the change ratio change of the voltage regulator, the fault does not disappear; and if the zero sequence admittance phase angle does not change along with the change ratio change of the voltage regulator, the fault disappears.
4. The method of claim 3, wherein: if the fault does not disappear, the transformation ratio of the voltage regulator is restored to an initial state, and the processing of the ground fault is waited;
and if the zero sequence admittance phase angle does not change along with the change ratio of the voltage regulator, the connection between the voltage regulator and the Z-shaped grounding transformer is disconnected, the fault disappears, and the power distribution network normally operates.
5. The method of claim 3, wherein: the carbon brush is arranged on the voltage regulator and can slide along the surface of the coil of the voltage regulator to change the transformation ratio of the voltage regulator.
6. The method of claim 1, wherein: the transformation ratio of the primary side and the secondary side of the Z-shaped grounding transformer is N1:N2The transformation ratio of the initial state of the voltage regulator is
The step-up transformer has a transformation ratio of
7. The method of claim 1, wherein: two wiring terminals are led out from each phase of the secondary side A, B, C three phases of the Z-shaped grounding transformer to form two groups of terminals, and each group of terminals comprises three terminals which respectively correspond to A, B, C three phases;
the two terminals on one side of the voltage regulator respectively correspond to one group of terminals and are respectively selectively connected in the corresponding group of terminals.
8. The utility model provides a distribution network ground fault arc extinguishing device which characterized in that: the method comprises the following steps: the Z-type grounding transformer is connected to a power distribution network, the tail ends of phase-shifting windings of the Z-type grounding transformer are connected in a star mode to form a neutral point O, and terminals of A, B, C three-phase leading-out wires on the secondary side are connected selectively with terminals on one side of the voltage regulator, terminals on the other side of the voltage regulator are electrically connected with the boosting transformer, one end of the other side of the boosting transformer is electrically connected with the neutral point O, and the other end of the boosting transformer is connected with the ground end;
when the fault is extinguished, two terminals on one side of the voltage regulator are respectively connected with 2 terminals led out from the secondary side of the Z-shaped grounding transformer to obtain voltage opposite to the neutral point voltage of the fault, and the voltage of the fault phase is suppressed to be lower than the arc extinguishing voltage after being boosted by the boosting transformer.
9. The apparatus of claim 8, wherein: when the fault arc is extinguished, if the wiring mode of the Z-shaped grounding transformer is ZNY11, one terminal on one side of the voltage regulator is connected with a terminal corresponding to the fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal leading out from the terminals led out from the secondary side by 120 degrees ahead of the fault phase;
if the wiring mode of the Z-type grounding transformer is ZNY1, one terminal at one side of the voltage regulator is connected with a terminal corresponding to a fault in the terminals led out from the secondary side, and the other terminal is connected with a corresponding terminal lagging by 120 degrees of a fault phase in the terminals led out from the secondary side;
wherein the transformation ratio of the primary side and the secondary side of the Z-type grounding transformer is N1:N2The transformation ratio of the initial state of the voltage regulator is
The step-up transformer has a transformation ratio of
10. The apparatus of claim 8, wherein: the carbon brush is arranged on the voltage regulator and can slide along the surface of the coil of the voltage regulator to change the transformation ratio of the voltage regulator.
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| CN114121449A (en) * | 2021-11-25 | 2022-03-01 | 云南电网有限责任公司电力科学研究院 | Phase-shifting transformer |
| CN114301046A (en) * | 2021-12-02 | 2022-04-08 | 广西电网有限责任公司电力科学研究院 | Distribution network ground fault arc extinction method and device based on electrodeless voltage regulation |
| CN115693630A (en) * | 2023-01-05 | 2023-02-03 | 国网山西省电力公司朔州供电公司 | Mixed arc quenching system based on split winding and working method thereof |
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| CN115693630A (en) * | 2023-01-05 | 2023-02-03 | 国网山西省电力公司朔州供电公司 | Mixed arc quenching system based on split winding and working method thereof |
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