JPH0480351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite equivalent test circuit for a shield breaker, and more particularly, to a composite equivalent test circuit for verifying the high current shield breaker performance of a power shield breaker. This paper relates to a synthetic equivalent test circuit for disconnectors and breakers that are ideal for generating re-EMF voltages.

The progress of large-capacity power disconnectors is remarkable, and research and development is currently underway with the goal of 300KV single-point disconnection, 550VK double-point disconnection, and disconnection.

On the other hand, the breaker standard adopts a 4-parameter re-electromotive voltage waveform in accordance with the re-electromotive voltage waveform generated in the grid, and many publications have been made regarding 4-parameter re-electromotive voltage generation circuits. FIG. 1 is an explanatory diagram of a four-parameter restart voltage waveform. Here t ₁ , t ₂ , u ₁ , u _c ,
are called initial wave height time, wave height time, initial wave height value, and wave height value, respectively. Generally, it is difficult to economically generate a re-electromotive voltage with a large pulse height time _t2 , and there are relatively few circuits that have been put to practical use in shear tests. Figure 2 is an example of a conventionally known circuit that is thought to be a four-parameter re-electromotive voltage generating circuit in principle, and is composed of three power supplies as shown in the figure, as seen in Japanese Patent Publication No. 52-9832. This is an example.

The first power supply is a low-voltage, high-current circuit, and supplies a predetermined short-circuit current from an AC power supply 1 through a current adjustment reactor 2, a first auxiliary shield breaker 3, and a test circuit breaker 4. 5 is a resistor, and 6 is a capacitor, which are connected to the output end of the reactor 2 to form a surge absorber. The second power supply (HV1) is almost the same as what is usually called the voltage source of a Weyl synthesis equivalence tester, except that a second auxiliary disconnector 7 is connected between the first and second power supplies. The points are different. The voltage source capacitor 8, the control gap 9, and the voltage source reactor 10 are each connected in series to the second power supply side of the auxiliary disconnector 7, as well as a restart voltage adjustment resistor 11 and a restart voltage adjustment capacitor 12. are connected in series and similarly connected to the secondary power supply side end of the auxiliary switch breaker 7. Furthermore, the third
A capacitor 13 is connected to the output end of the power supply (HV2). The output ends of the third power source are connected to both ends of the auxiliary breaker 7, while a circuit in which a parallel circuit of a reactor 14 and a resistor 15 is connected in series with a control gap 16 is connected to one output end. Further, a capacitor 17 is connected to both ends of the auxiliary shunt breaker 7.
The operation of the above configuration will be explained next. However, since the first power supply and the second power supply are the same as those of the conventional Weyl synthesis equivalent test circuit and are well known, detailed explanation will be omitted.

Control gap 9 immediately before the final current zero point of the first power supply
A command is issued to the DC high voltage device HV1 in advance.
More charged capacitor 8 to reactor 1
0, the voltage source current is supplied to the test sample or disconnector 4 through the second auxiliary shield disconnector 7, and when the test sample or disconnector 4 succeeds in disconnecting, the terminal of the test sample or disconnector 4 is connected. A voltage as shown in FIG. ₁ is applied.

After the initial portion of the voltage V ₁ is generated, the second auxiliary disconnector 7 opens rapidly with little variation in opening time.
Cuts the relatively small current that was flowing. Thereafter, a trigger is given to the control gap 16 to supply the capacitor 17 from the second DC high voltage power supply HV2, which is the third power supply, from the previously charged capacitor 13 via the reactor 14, the resistor 15, and the control gap 16. Charge. This allows the second
As shown in _FIG .
A voltage appears delayed by a minute time Δt with respect to V ₁ . The voltages V ₁ and V ₂ are added, and a four-parameter re-electromotive voltage whose peak value, shown as VTR in FIG.

However, in general short-circuit test sites, there is little variation in opening time, and rapid opening and disconnecting circuits are expensive.
It is difficult to obtain, and adding a third power supply to the conventional Weilhe synthetic equivalent test circuit may cause problems in terms of test site area, construction cost, handling time, etc. Suggestions were strongly requested.

SUMMARY OF THE INVENTION An object of the present invention is to provide a synthetic equivalent test circuit for a circuit breaker that can generate a parameter restart voltage with a long peak time using a simple circuit configuration.

The present invention omits the installation of a third power supply, and after the initial portion of the restart voltage is generated, the restart voltage adjustment circuit is once disconnected from the voltage source capacitor, and then the electric charge remaining in all or part of the same voltage source capacitor is removed. Two sets of restart voltage adjustment circuits are provided so that the restart voltage can be raised again by utilizing the above.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

In this embodiment, the same members as shown in FIG. 2 are given the same reference numerals, and their explanations are omitted.

A control gap 18 is placed in place of the auxiliary shunt breaker 7 shown in FIG. 2, and a series circuit of a resistor 19 and a capacitor 20 is connected between the connection point of the control gap 18 and the reactor 10 and the ground. Furthermore, a resistor 21 and capacitors 22 and 23 are connected in parallel with the test sample and disconnector 4.
A series circuit consisting of a resistor 24 and a capacitor 25 is also connected. Further, the capacitor 8 is divided into 8a and 8, and a series circuit consisting of a control gap 26 and a resistor 27 is inserted between the dividing point and the connection point of the capacitors 22 and 23.

An embodiment of the present invention having the above configuration will be described based on the operation diagram of FIG. 4.

When the control gap 18, which has a slight disconnection or disconnection ability, is discharged at _{t a} just before the final current zero point t ₀ of the current source current i _c passing through the test sample or disconnector 4, the capacitors 8a and 8
A voltage current i _v is passed from b through the reactor 10 to the test sample and the disconnector 4. As a control gap with a slight breakage performance, for example, a control gap in SF ₆ gas, a control gap in spray gas, etc. can be used. The capacitors 8a and 8b are capacitors that are charged in series with the same polarity from a DC high voltage generator (not shown). During this period, capacitor 8
The ground voltage _Vc at the connection point between b and the reactor 10 changes as shown in FIG. If the test sample or disconnector 4 succeeds in cutting off the voltage source current i _v at time t _b , and the control gap 18 cannot cut off the current, the charges in the capacitors 8 a and 8 b are transferred through the reactor 10 . A resistor 19 for adjusting the restart voltage, a capacitor 20 for adjusting the restart voltage, and a resistor 21 for adjusting the restart voltage, capacitors 22, 23 for adjusting the restart voltage, and a resistor 21 for adjusting the restart voltage, capacitors 22, 23,
Flows into the resistor 24 and capacitor 25 for the same purpose,
A voltage V ₁ as shown in FIG. 4 is applied to the terminals of the test sample and disconnector 4. After the re-electromotive voltage is generated, the current waveform passing through the control gap 18 has a vibration frequency as shown by the dotted line between t _b and t _c in Fig. 4, which is higher than _iv shown by the solid line between t _a and t _b , is smaller than _iv . In the present invention, since it is desired to cut off the current passing through the control gap 18 at time _tc , the values of the resistor 19 and capacitor 20 are selected in consideration of the cutting performance of the control gap 18. Thereby, part of the oscillating current is shunted and the control gap 18
adjust the current passing through. If the capacitance of the capacitor 23 is selected to be sufficiently large compared to the capacitor 22, the voltage to ground from the capacitor 23 at this point is very small, so the control gap 26 is discharged around time _tc , and an appropriate resistor 27 is selected. It is possible to charge the capacitor 23 with a suitable time constant. The control gap 26 may be discharged before or after t _c . After the control gap 26 is discharged, the ground potential of the capacitor 23 becomes, for example, as shown in FIG. 4, _V2 . If the capacitance of the capacitor 25 is selected to be sufficiently small compared to 22, and the resistor 24 is selected to be sufficiently large compared to 21, the terminal voltage of the test sample and disconnector 4 can be expressed in 4 parameters as shown as TRV in Figure 4. It is possible to set the restart voltage suitable for

According to the embodiment shown in FIG. 3, by effectively utilizing the second power source, it is possible to provide a four-parameter restart voltage generating circuit with a simple configuration without providing a third power source.

FIG. 5 is a main circuit diagram showing a second embodiment of the present invention. This embodiment deals with the problem that within a finite time range considered in an actual breaker such as the TRV shown in Fig. 4, a waveform that continues to rise is observed and it is difficult to determine the maximum value. . As shown in FIG. 5, a portion 8 of the capacitor 8a
A ¹ is provided with a resistor 28 and a discharge control gap 29,
The control gap 29 is flashed at the time _td when the waveform TRV shown in FIG. 4 reaches the required value. As a result, after time _td in FIG. 4, it becomes possible to reduce TRV as shown by the dashed line. This has the effect of making the TRV peak value and peak time clear.

FIG. 6 is a main circuit diagram showing a third embodiment of the present invention. This embodiment is a partial modification of the embodiment shown in FIG. 3, and instead of the control gap 18 in the embodiment shown in FIG. 30 is provided, and a discharge control gap 31 is also provided in series with the capacitor 8b. Further, a reactor 32 is provided at the position where the resistor 27 is used in FIG. 3. In this circuit, since the capacitor 20 is initially separated by the gap 31, there is no surge current in the initial part of the voltage source current, and there is an effect that there is no adverse effect on measurement, induction to the control system, etc. Furthermore, the effect of replacing the resistor 27 in Fig. 3 with the reactor 32 is that due to the vibration phenomenon with the capacitor 23, the maximum value clearly appears in the re-electromotive voltage applied to the test sample or disconnector. .

FIG. 7 is a circuit diagram showing a modification of the present invention,
Except for the resistor 24 and capacitor 25 in Fig. 3, these effects are expected only from the distributed capacitance of the circuit as shown by the dotted line, and the discharge control gap 1
One electrode of No. 8 is placed on the ground potential side. A synthetic injection equivalent test has already been put into practice, and it is known that when a control gap is placed in SF ₆ gas for this purpose, it has some shearing performance. In this case, one terminal of the control gap is often constructed so that it is sufficient to withstand a current source voltage at a low potential with respect to ground potential. In FIG. 7, the input control gap can be inputted, and the components corresponding to the resistor 24 and capacitor 25 in FIG. 3 are omitted. This has the advantage that the test circuit can be configured in a number of ways.

FIG. 8 is a circuit diagram showing still another modification of the present invention, in which the entire voltage of the voltage source capacitor 8 is used to charge the capacitor 23 after discharging the control gap 26, so the four-parameter restart voltage with a high peak value This has the effect of causing

As described in detail above, in the present invention, two sets of re-EMF circuits are used in series, and the capacitance of one is selected to be larger than that of the other, so that the voltage source current and the re-EMF voltage are The peak values of the initial part and the four-parameter re-emf voltage can be provided economically.

As is clear from the above, according to the present invention, a parameter restart voltage with a high peak value can be generated with a configuration using a small number of power supplies.

[Brief explanation of drawings]

Fig. 1 is an operational explanatory diagram of a conventional synthetic equivalent test circuit for a shredded breaker, Fig. 2 is a diagram of a conventional synthetic equivalent test circuit for a shredded breaker, and Fig. 3 shows the first embodiment of the present invention. FIG. 4 is an explanatory diagram of the operation of the present invention, FIG. 5 is a circuit diagram of a main part showing the second embodiment of the present invention, and FIG.
7 is a circuit diagram showing a modification of the invention, and FIG. 8 is a circuit diagram showing another modification of the invention. 1... Alternating current, 2... Reactor for current adjustment, 3... Auxiliary disconnector, 4... Test or disconnector,
5, 19, 21, 24, 27, 28...resistance,
6, 8, 8a, 8a ¹ , 8b, 20, 22, 25...
... Capacitor, 10 ... Voltage source reactor, 1
8, 26, 29, 31...control gap, 30...
...Shiya disconnector, 32...Reactor.

Claims (1)

[Claims] 1. A test sample or disconnector 4 whose terminal is grounded to the earth, an auxiliary shield or disconnector 3 provided between the other terminal of the test sample or disconnector and the earth, and a first power source 1. It is a series circuit consisting of a current source circuit that supplies a short-circuit large current to the test sample or disconnector, and a current source circuit that is sequentially provided between the other terminal of the test sample or disconnector and the ground from the other terminal side. 1 discharge control gap 1
8, a first reactor 10, and a plurality of voltage source capacitors 8a and 8b, the voltage source circuit supplies a voltage source current to the sample under test and the disconnector; and the first discharge control circuit. A first resistor 19 and a first capacitor 2 are provided between the connection point between the gap and the first reactor and the ground in order from the connection point side.
0, and constitutes a closed circuit together with the first reactor and the plurality of voltage source capacitors (first re-electromotive voltage adjustment circuit).
and a second resistor 21 and second and third capacitors 22 and 23 provided between the other terminal of the test sample or disconnector and the ground in order from the other terminal side, and the third capacitor a second series circuit (second restart voltage adjustment circuit) whose capacitance is selected to be larger than the capacitance of the second capacitor; and a connection point between the plurality of voltage source capacitors of the voltage source circuit; and a third series circuit including a second discharge control gap 26 and a third resistor 27 provided between the connection point of the second and third capacitors of the second series circuit. A synthetic equivalent test circuit for a shiya breaker characterized by the following. 2. Claim 1 provides that a series circuit composed of a fourth resistor 28 and a third discharge control gap 29 is connected in parallel to a portion 8a' of the plurality of voltage source capacitors. This is a synthetic equivalent test circuit for shiya circuit breakers. 3 A test sample or disconnector 4 with one terminal grounded to the earth,
A series circuit consisting of an auxiliary disconnector 3 installed between the other terminal of the test sample or disconnector and the ground, and a first power supply 1, which supplies a short circuit large current to the test sample or disconnector. A series circuit consisting of a current source circuit, a first discharge control gap 31, a first reactor 10, and a plurality of voltage source capacitors 8a and 8b, which are provided between the other terminals of the sample or disconnector and the ground. In a composite equivalent test circuit for a shield circuit breaker having a voltage source circuit that supplies a voltage source current to the specimen or disconnector, the other terminal of the specimen or disconnector is ungrounded from the voltage source circuit. a third cable breaker 30 provided between the third cable breaker 30 and the non-ground terminal of the voltage source circuit, and a connection point between the third cable breaker and the non-ground terminal of the voltage source circuit and the ground from the connection point side. A first resistor 19 and a first capacitor 2 provided in sequence
0, and constitutes a closed circuit together with the first discharge control gap, the first reactor, and the plurality of voltage source capacitors (first re-EMF adjustment circuit); It is composed of a second resistor 21 and second and third capacitors 22 and 23, which are sequentially provided between the other terminal of the trial disconnector and the ground, from the other terminal side, and the electrostatic capacitance of the third capacitor is a second series circuit (second re-electromotive voltage adjustment circuit) selected to be larger than the capacitance of the second capacitor; and a connection point between the plurality of voltage source capacitors of the voltage source circuit and the second series circuit. It is characterized by having a third series circuit composed of a second discharge control gap 26 and a second reactor 32 provided between the connection point of the second and third capacitors of the circuit. Synthetic equivalent test circuit for breaker. 4 A test sample or disconnector 4 with one terminal grounded to the earth,
A series circuit consisting of an auxiliary disconnector 3 installed between the other terminal of the test sample or disconnector and the ground, and a first power supply 1, which supplies a short circuit large current to the test sample or disconnector. a current source circuit, and a plurality of voltage source capacitors 8 sequentially provided between the other terminal of the test sample or disconnector and the ground from the other terminal side.
a, 8b, a first reactor 10, and a first discharge control gap 18; It is composed of a first resistor 19 and a first capacitor 20, which are provided between a connection point between the discharge control gap and the first reactor and the other terminal of the test sample or disconnector, and a first series circuit (first re-electromotive voltage adjustment circuit) constituting a closed circuit together with the plurality of voltage source capacitors;
and a second resistor 21 and second and third capacitors 2 provided between the other terminal of the test sample or disconnector and the ground.
2 and 23, the capacitance of the third capacitor is selected to be larger than the capacitance of the second capacitor, and one terminal of the third capacitor is connected to the test sample or disconnector. Second series circuit connected to other terminal (second restart voltage adjustment circuit)
and a second discharge control gap 26 provided between the connection point between the plurality of voltage source capacitors of the voltage source circuit and the connection point of the second and third capacitors of the second series circuit. 3. A composite equivalent test circuit for a shield breaker, characterized in that it has a third series circuit composed of a resistor 27 of 3.