JPS6231459B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to the equipment arrangement of a direct current disconnection device in which a current zero point generator is connected in parallel with a disconnection device. Essentially, the performance required for DC current and circuit breakers requires excellent characteristics near the current zero point, which can be uniquely determined by creating a current zero point at the edge or break of the DC current or circuit breaker. There are many different ways to create a current zero point, but one method is to install a current zero point generator consisting of a pulse transformer and a capacitor in parallel with the shear break, and when the shear break starts, the current zero point generator starts. A high-frequency current is generated and superimposed on the shear current, forcibly creating a current zero point at the shear break, cutting off the current, and transferring the electromagnetic energy accumulated in the circuit to the ground through the energy absorption device and grounding device. There is a method of discharging electricity. Alternatively, instead of using a pulse transformer as a device to create a current zero point at the edge or disconnection, the above method can be achieved by simply storing electric charge directly in a capacitor, and by providing some kind of starting device and starting the starting device. There is a device that creates a current zero point similar to the method. Furthermore, as another method, we connect a device consisting of a capacitor and an inductance in series in parallel with the breaker, and show the relationship between the arc voltage and arc current that occur when the breaker opens. By using characteristics that exhibit negative characteristics,
There is also a device that generates an oscillating current in a loop formed by a capacitor, a reactor, and a circuit breaker, and creates a current zero point using the same method as above. However, in either method, the scale of the current zero point generator increases as the rated voltage of the DC or disconnector increases, and if the practical level of DC power transmission is 250KV or higher, the generator will be It becomes huge in size. Furthermore, although not discussed in detail here, the DC circuit includes a large inductance, which requires the energy harvesting device to absorb a large amount of energy. Therefore, the direct current and disconnection devices are extremely large-scale. Further, since such large-scale equipment is used by being connected to the main line of power transmission equipment, it is necessary to have special reliability and safety. Furthermore, in order to manufacture a large-scale switchgear with such reliability and safety, it is necessary to configure each component that makes up the direct current or disconnection device in as short a circuit as possible. The present invention has been made in consideration of the above points, and its purpose is to arrange equipment for direct current and disconnection devices in extremely rational locations, including current zero point generators and energy absorption devices. The purpose of the present invention is to provide direct current and disconnection devices that are arranged to ensure economy, safety, and reliability. Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. In Figure 1, the points 1-1, 1-2, 1-3, and 1 have excellent characteristics near the current zero point.
The shield section 1 consisting of -4 is, for example, a vacuum shield or SF ₆ gas shield, and in this embodiment, the
Although a point cutter or a cutter is used, the same applies to a two-point cutter or a cutter configuration using multiple types of cutter or cutting media. Each side point 1-1, 1-2, 1-
Voltage divider to equally share the voltage of 3, 1-4, for example voltage dividing capacitor 2-1, 2-2, 2-
3, 2-4 and voltage dividing resistor 3-1, 3-2, 3-
3, 3-4 are the breaking points 1-1, 1-2, 1- respectively
3 and 1-4 are connected in parallel to form a breaker 5. Energy absorption device 10 consisting of a non-linear resistor,
One of the energy absorbing devices 11 and breaker 5 of 11
The other energy absorbing device 10 is connected to the terminal 6 side. The energy absorption device 10 is energy absorption device 10-1, 10
-2 are connected in parallel, and normally exhibits high resistance and blocks current, but when the power is cut off, the grounding operation of the earthing switch 12 connected to the other end of the energy absorbing device 10 It absorbs the electromagnetic energy of the circuit and discharges it to the ground. The energy absorbing device 11 also normally exhibits high resistance and blocks the current.
It limits the voltage applied to the circuit and absorbs the electromagnetic energy of the circuit, similar to a nonlinear resistor. The commutating capacitor 13 normally blocks the main current 15, but when the main current 15 is interrupted, it blocks the high frequency current 19 with a frequency and magnitude determined by the capacitance of the commutating capacitor 13 and the inductance of the pulse transformer 17.
flows through the electrical path 21 indicated by the broken line. The lightning arrester 23 connected in parallel to the voltage winding 17H of the pulse transformer 17 is made of, for example, a non-linear resistor, and absorbs the abnormal voltage when it occurs in the pulse transformer 17 for some reason. In addition, a charge storage capacitor 25 and a trigger gap 27 are connected to the low voltage winding 17L of the pulse transformer 17.
is connected, the charge storage capacitor 25 has a charging device (not shown), the trigger gap 27 also has a trigger starting device (not shown), a trigger circuit device 28 is constituted, and the commutating capacitor 13 and the pulse Transformer 17 and trigger circuit device 28
A current zero point generator 29 is constructed from the above.
Further, a bushing 31 is connected to the terminal 6 side of the sheath disconnector 5 via a disconnect switch 33, and a bushing 32 is connected to the terminal 7 side via a disconnect switch 34. In order to measure voltage and current, DC current transformers 41-1 and 41-2 (hereinafter referred to as DC-CT) are connected between the terminal 6 on the bushing 31 side and the disconnector 33.
A DC voltage transformer 43 (hereinafter referred to as DC) is connected between the terminal 6 side of the disconnector 33 and the ground.
−PT). Similarly, Bushing 32
DC- consisting of DC-CT42-1, 42-2 on the side
CT42 and DC-PT44 are provided. The operation of this direct current and disconnection device 35 will be explained. Normally, the main current 15 flows in the direction of the arrow through the bushing 31, the disconnector 33, the breaker 5, the disconnector 34, and the bushing 32, but this main current 15 flows into the fault current 39 shown by the dotted line. When changed, Mashiya breakpoint 1-1, 1-2, 1-3, 1-
4 opens and enters an arc state, and the trigger gap 27 is subsequently operated by a trigger starting device (not shown), discharging the charge from the charge storage capacitor 25 charged in advance by a charging device (not shown), A discharge current 37 flows in the direction of the arrow. As a result, a voltage is induced in the high voltage winding 17H of the pulse transformer 17, and the commutating capacitor 1
A high frequency current 19 determined by the capacitance of 3 and the inductance of the pulse transformer 17 flows through the electrical path 21 shown by the dotted line,
-2, 1-3, 1-4, a current zero point is forcibly created by superimposing on the fault current 39, and the
-Fault current 3 due to 1, 1-2, 1-3, 1-4
9. At the same time, by closing the grounding switch 12, the electromagnetic energy accumulated on the DC transmission line (not shown) outside the DC and disconnection device 35 is discharged to the ground through the energy absorption devices 10 and 11, , 1-2, 1-3, and 1-4, and also prevents any adverse effects on other equipment connected to the DC line. Further, when the shear breaker 1 cuts off the fault current 39, a voltage higher than the voltage limited by the energy absorption device 10 is generated. Since this voltage is generated between the bushings 31 and 32 as a recovery voltage of the circuit breaker 5, an energy absorption device 11 is provided to limit this recovery voltage, and the energy absorption device 11 limits the voltage. Break point 1-1, 1-
2, 1-3, 1-4, voltage dividing capacitors 2-1, 2-2, 2-3, 2-4 and voltage dividing resistors 3-1, 3-2, 3-3 provided in parallel, respectively. , 3-4, uniform partial pressure can be applied. After absorbing such energy, the grounding switchgear 12 is opened, and the energy absorbing devices 10 and 11 are once again insulated from the ground. When all of these operations are completed, the disconnectors 33 and 34 are opened to disconnect the shield breaker 5 from the DC circuit. Next, the configuration and arrangement of each device and equipment will be explained in accordance with the circuit diagram of the DC and disconnection device 35 shown in FIG. Among the part numbers shown in Fig. 2 and above, the part number shown in Fig. 1 with an A appended indicates the tank of the equipment, but in the following explanation, the part number shown in Fig. 1 indicates the tank of the equipment. Part numbers may also be used as is. In FIG. 2, it is connected to both terminals 6 and 7 (not shown) of the insulation switch 5 housed in the tank 5A,
Pipe busbars 45, 4 provided perpendicularly to the tank 5A
6 are respectively connected to bushings 31 and 34 via disconnectors 33 and 34 housed in tanks 33A and 34A, respectively.
32 and housed in tanks 41A and 42A, respectively, between the pipe busbars 45 and 46.
- DC-PTs 43, 44 housed in CTs 41, 42 and tanks 43A, 44A are provided.
In this way, the terminal 6 and the bushing 31 side and the terminal 7
Since the bushing 32 side and the bushing 32 side are arranged in exactly the same manner, the bushing 31 side will be explained first.
A DC stored in tank 43A is placed above this.
- PT43 is provided, and tank 33A is installed above it.
A disconnector 33 housed in the tank 41A, 43 is provided, and a bushing 31 is attached vertically to the disconnector 33.
Both A and 33A are pipe-shaped, and their axial directions are horizontal and are installed in the same direction as the axial direction of the tank 5A. As described above, the bushing 32 side is configured and arranged in exactly the same manner. In such a direct current or disconnection device, it is necessary to keep the energized part a considerable distance from the ground. That is, the heads of the bushings 31, 32 must be located considerably above, and a considerable space is formed between them and the bushings and the cutter, which are located at a relatively low level. As mentioned above,
Tank 41A containing low-pressure side circuit components,
43A, 42A, and 44A are arranged above the shaya breaker 5A, and the voltage and current measuring device is connected to the shiya breaker 5.
In addition to being able to be attached to the breaker 5 itself, the space above the breaker 5 can be utilized to provide the advantage of reducing the floor space. Next, the configuration of the commutating capacitor 13 is as shown in FIG. This high voltage winding 17
The conduit busbar 48 connected to H is connected to a conduit busbar 49 that bends the conduit in the horizontal direction, and further connects to the conduit-shaped arm portions 50-1, 50-2, 50 in the horizontal orthogonal direction.
-3, 50-4 is connected to the conduit busbar 50.
Each arm portion 50-1 of this pipe busbar 50,...
50-4 denotes capacitors 13-1, 13-2, 13-3, 13-4 collectively referred to as commutating capacitor 13.
and for parallel connection, the lower part of each of capacitors 13-1 and 13-3 is connected to the conduit bus bar 51.
Similarly, capacitors 13-2, 1
The lower portions of each of the capacitors 13-3 and 13-4 are connected to each other by a conduit busbar 52, and are also connected to the lower end of each of the capacitors 13-3 and 13-4 and to the terminal 7 (not shown) of the disconnector 5. A commutating capacitor 13 is inserted and connected between the terminal 7 of the circuit breaker 5 and one end of the high voltage winding 17H of the pulse transformer 17. In a method such as this DC current and disconnection device that superimposes a high-frequency current on a DC current to forcibly create a current zero point and then disconnects the current, the current slope near the current zero point depends on the magnitude of the disconnection current. It is necessary to adjust the value of the ratio di/dt. As shown in Fig. 4, in a diagram in which the vertical axis represents current and voltage and the horizontal axis represents time, the shear breaking capacity of the sheath breaker 5 is determined by the current slope rate di/di of the curve. , is determined by the voltage increase rate dv/dt of the curve near the current zero point of the recovery voltage of the corresponding curve, but as the fault current 39 that breaks the curve increases, it is superimposed on this. The magnitude of the high frequency current 19 that forcibly creates a current zero point must also be increased. For this reason, the value of the current slope rate di/dt in the vicinity of the current zero point of the curve inevitably increases, making it difficult to interrupt the current. Furthermore, not only this, but as the curve indicating the fault current that causes a break (corresponding to fault current 9 in Fig. 1) increases, the ability of the break breaker 5 to break quickly may decrease. generally well known. Therefore, in order to be able to withstand any kind of disconnection or disconnection under general practical conditions, the frequency of the curve representing the high frequency current (corresponding to the high frequency current 19 in FIG. 1) is reduced. That is, it is necessary to reduce the current slope rate di/dt of the curve. Furthermore, in order to cut off large currents,
Impedance of a circuit that flows high-frequency current

It is necessary to reduce [Formula] and, as a result, increase the value of the high-frequency current. That is, the capacitor value C
needs to be made larger. Under these conditions, the current value required for the DC current and disconnection device to cut off varies depending on the location and circuit conditions where it is used, and for this reason, the DC current and disconnection device must be designed and manufactured on a case-by-case basis. Otherwise, the cost would be very high. Therefore, it is necessary to be able to easily change the value of the commutating capacitor 13 depending on the magnitude of the fault current 39 that ebbs and flows. As shown in FIG. 3, the arm portion 5 of the pipeline busbar 50
Capacitors 13-1, ..., 13-4 are connected to 0-1, ..., 50-4 as units according to their needs.
can be installed. That is, if the fault current 39 to be interrupted is relatively small, only the capacitor 13-4 is installed as shown in FIG. In this way, the impedance of the high frequency current circuit becomes uniquely large, and the value of the high frequency current 19 becomes small. On the other hand, if the fault current 9 to be interrupted is large, the capacitors 13-1, ..., 13-
4, and in this way the impedance of the high-frequency current circuit becomes uniquely small, the value of the high-frequency current 19 increases, and the frequency of the high-frequency current 19 decreases, and the current slope rate of the curve shown in FIG. di/dt also becomes a small value, making shearing possible. In addition, as shown in FIG. 5, the capacitor 13-4
When one piece is installed, the other arm part 5 of the conduit busbar 50
0-1, 50-2, and 50-3 are each covered with a blind plate to maintain insulation. The number of capacitors is 2
It is also possible to use one or three pieces in the same way. Further, as shown in FIG. 6, a pipe busbar 55 is further connected to the pipe busbar 50, and arm portions 55-1, 55
Capacitors 13-5 and 13-6 are attached to -2, respectively, and the lower parts of capacitors 13-3 and 13-5 are connected to the pipe bus line 56, and the lower parts of capacitors 13-4 and 13-6 are similarly connected to the pipe bus line 56. 57, the capacitance of the commutating capacitor 13 can be increased. As mentioned above, it is easy to increase or decrease the number of capacitors forming a unit of the commutating capacitor 13 according to the magnitude of the fault current 39, without designing and manufacturing each time. can correspond to Next, the second energy absorbing device 10 and the first energy absorbing device 11 are connected in a configuration as shown in FIG. Two second energy absorbing devices 10-1 are housed in tanks 10-1A and 10-2A, respectively, on a conduit busbar 47 connected to a terminal 6 (not shown) of a shield breaker 5 and a pulse transformer 17. ,10-
The lower portions of the second energy absorbing devices 10-1 and 10-2 are connected by a conduit busbar 58, and the upper portions of the second energy absorbing devices 10-1 and 10-2 are connected by a conduit busbar 58.
0 is configured. A grounding switch 12 housed in a tank 12A is connected to the center of this conduit busbar 58, and a grounding wire 12a is drawn out. Further, the pipe line busbar 53 connected to the terminal 7 (not shown) of the shield breaker 5 is connected to the lower part of the energy absorbing device 11 housed in the tank 11A, and is connected to the upper part of the first energy absorbing device 11. Pipe busbars 59, 6 to be connected
It is connected to the conduit busbar 47 via lines 0 and 61. That is, the energy absorbing device 11 is connected in parallel to both terminals 6 and 7 (not shown) of the shield and disconnector 5. In this way, the second energy absorbing device 10, the first
Since the conduit busbars 47 and 53 are commonly used to connect the energy absorbing devices 11, the floor space and cost can be significantly reduced. In the structure of the DC current and disconnector 35 described above,
When the breaking fault current 39 is large, the energy stored in the DC line inevitably becomes large. In other words, it is necessary to change the size of the energy absorption device depending on the magnitude of the fault current 39 to be interrupted, and it is necessary to design the DC current and disconnection device each time according to the specifications of the DC current and disconnection device. occurs. In FIG. 7 of this embodiment, one of the second energy absorbing devices 10 is formed into a unit, and is constituted by this unit. That is, the energy absorbing devices 10-1 and 10-2 are arranged as a unit in the middle on the pipe bus line 47, and furthermore, the upper part of each second energy absorbing device 10-1 and 10-2 unit is connected to the pipe bus line 58. are connected in parallel by. In this way, depending on the processing energy amount of the direct current or disconnection device 35, the number of energy absorbing devices can be increased or decreased as a unit. In order to increase or decrease the processing energy of the unitized energy absorption device as described above, the pipe busbar 4
By installing a conduit busbar having three or more arms at each of 7, 53, 58, and 59, for example, a conduit busbar having a shape as shown in FIGS. 8 to 10, an energy absorption device can be provided. It can be easily increased or decreased as needed. In FIG.
Energy absorption devices 63-1, 63-2, 63-3, 63- which are unitized in 5-3 and 65-4 respectively
4 can be connected. Further, in FIG. 9, the conduit busbar 66 connects the energy absorbing devices 63-1, 63-2 to the arm portions 66-1, 66-2, respectively. Furthermore, in FIG. 10, the conduit busbar 67 can connect energy absorbing devices 63-1, 63-2, 63-3 to arm portions 67-1, 67-2, 67-3, respectively. In this way, it can be easily increased or decreased, and the energy absorbing device can be adapted to any type of DC current or disconnection device with the same parts, that is, the same unit of energy absorption device, without having to design and manufacture each DC current or disconnection device according to its specifications. Although the main configuration of the direct current and disconnection device 35 has been explained in sequence with reference to FIGS. 1, 2, 3, and 7, the overall configuration is as shown in FIGS. 11 and 12. become. Cable 68a connected to outlet 8 of low voltage winding 17L of pulse transformer 17
is connected through a trench or duct 69 to a trigger circuit mounting 28 (not shown) housed within a separate cubicle 70 as shown in FIG. Furthermore, frames 71 and 72 are attached to the voltage transformers 43 and 44, respectively. As explained above, according to the configuration of the present invention,
A DC voltage transformer, a DC current transformer, a disconnector, and a bushing are installed above each terminal of the shield breaker tank, and a pulse voltage transformer, a DC current transformer, a disconnector, and a bushing are connected in parallel to both ends of the shield breaker tank via a conduit busbar. A current zero point generator is installed, consisting of a series circuit of the high-voltage winding of the transformer and a commutating capacitor, and a trigger circuit device consisting of the low-voltage winding of the pulse transformer, a charge storage capacitor, and a trigger gap device. An energy absorbing device and a grounding switch are installed in series between one end of the disconnector and the ground, and an energy absorbing device is connected in parallel to both ends of the disconnector, and both devices are housed in a tank. , and by connecting the pipes by sharing the bus line, the space can be used effectively to reduce the overall size, and a unitized commutation capacitor and energy absorption device can be installed. With this, commutation capacitors or energy absorbing devices can be easily increased or decreased to accommodate various specifications, and it is also possible to connect directly to a disconnector to measure voltage and current. Direct current and disconnection devices can be provided.

[Brief explanation of the drawing]

1 to 4, 7, 11 and 12 respectively show the direct current and disconnection device of the present invention, FIG. 1 is an electric circuit diagram, FIG. 2, FIG. 3 and FIG. The figures are a partial perspective view of the configuration arrangement, Fig. 4 is a diagram of current zero point cut-off characteristics, Fig. 11 is a perspective view of the entire device,
Figure 12 is a perspective view of a separate cubicle;
6, 8 to 10 respectively show other embodiments of the present invention, FIGS. 5 and 6 are perspective views showing commutating capacitors, and FIGS. 8 to 10 respectively show other embodiments of the present invention. It is a top view which shows the pipe busbar which connects an energy absorption device. 1...Shiya section, 1-1, 1-2, 1-3, 1
-4...Shiya break point, 2-1, 2-2, 2-3, 2
-4...Division capacitor, 3-1, 3-2, 3-
3, 3-4... Voltage dividing resistor, 5... Line breaker, 6,
7...Terminal, 10, 10-1, 10-2, 11,
63-1, 63-2, 63-3, 63-4... Energy absorption device, 12... Earthing switchgear, 13,
13-1, 13-2, 13-3, 13-4, 13
-5, 13-6... Commutation capacitor, 15... Main current, 17... Pulse transformer, 17H... High voltage winding, 17L... Low voltage winding, 19... High frequency current, 21... Electric circuit, 23 ... Lightning arrester, 25 ... Charge storage capacitor, 27 ... Trigger gap,
28... Trigger circuit device, 29... Current zero point generator, 31, 32... Bushing, 33, 34...
... Disconnector, 35 ... DC or disconnection device, 37 ... Discharge current, 39 ... Fault current, 41, 42 ... DC current transformer, 43, 44 ... DC voltage transformer, 5
A, 10A, 11A, 12A, 13A, 17A,
33A, 41A, 42A, 43A, 44A...Tank, 45, 46, 47, 48, 49, 50, 5
1, 52, 53, 55, 56, 57, 58, 5
9, 60, 61, 65, 66, 67...pipe busbar, 65-1, 65-2, 65-3, 65-4,
66-1, 66-2, 67-1, 67-2, 67
-3...Arm part, 68...Low pressure outlet, 68a...
Cable, 70... Cubicle.

Claims (1)

[Claims] 1 A circuit disconnector is constructed by connecting a voltage divider capacitor and a voltage divider resistor in parallel to multiple circuit disconnectors connected in series, and a disconnector is connected to each end of the circuit disconnector. a bushing connected thereto, a current zero point generator connected in parallel to the shield breaker,
A first energy absorbing device also connected in parallel to the shield breaker, and a second energy absorbing device and a grounding switch connected in series between one end of the shield breaker and the ground; It also consists of a DC voltage transformer connected in series between one end of the shield breaker and the ground, and a DC current transformer disposed between the shield breaker and the disconnector. equipment
A direct current or disconnection device characterized by being housed in a container filled with SF ₆ gas.