JPH0356879A - Circuit breaker testing device - Google Patents

Abstract

PURPOSE:To make a voltage impressed between poles after a breaking same as the voltage in an actual system by connecting a 2nd auxiliary breaker and a resistor respectively between a breaker to be tested and a 1st and 2nd voltage sources. CONSTITUTION:An auxiliary breaker CBc is closed and an auxiliary breaker CBa is left opened, then a current I1 is made to flow to the breaker CB to be tested from a power supply PO through the auxiliary breaker CBa. When the breakers CB, CBa are opened at a time point t1, the current I1 is interrupted at a time point t2 but a current I2 is made to flow by a while device before/after this interruption. When an auxiliary breaker CBb is closed at a time point 3, a voltage V1 is impressed to the breaker CB to be tested. When an auxiliary breaker CBc is opened during time points t3-t4, a current I3 is interrupted at a time point t4, and after that, a voltage V2 is impressed to the breaker CB to be tested from a low voltage terminal 2 through the resistor R. Consequently, the same waveform as one in the actual system can be obtained.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a circuit breaker testing device.

B. Summary of the Invention The present invention provides an equivalent test for leading current interruption of a circuit breaker by connecting an auxiliary circuit breaker and a capacitor between the circuit breaker under test, a current source, and a voltage source, respectively. There are two voltage sources, a first voltage source and a second voltage source lower than this voltage, and a second auxiliary circuit breaker and a resistor are connected between the circuit breaker under test and the first and second voltage sources, respectively. At the same time, the capacitor is connected to the ground side of the test circuit breaker, and the voltage applied to the test circuit breaker can be made the same as the actual system voltage by opening the second auxiliary circuit breaker.

In addition, the present invention connects a fill device to the circuit breaker under test in parallel, and connects first and second auxiliary circuit breakers between the circuit breaker under test and the current source and the voltage source, respectively. In the case where a composite test is performed, the voltage sources are a first voltage source and a second voltage source lower than this voltage, and the second auxiliary circuit breaker and the first and second voltage sources are connected to each other. A third auxiliary circuit breaker and a resistor are connected between the two, respectively, so that the voltage applied to the test circuit breaker can be made the same as the actual system voltage by opening the third auxiliary circuit breaker.

C. Conventional technology With the increase in voltage and capacity of electric power systems, equivalent test equipment is used in place of actual load tests for circuit breaker tests.

(1) An equivalent test device for verifying the advanced current breaking performance of a circuit breaker has conventionally been used, as shown in FIG. A current is supplied to the test circuit breaker CB through the transformer T1 to the power supply PO.
is connected to the capacitor C, with its secondary side S, as the voltage source.
A voltage Vs is applied to the test circuit breaker CB through the circuit breaker CB. Figure 5 shows the current and voltage waveforms of each part of this circuit. Note that LA in the figure is an overvoltage suppression device.

■At time t, IFr circuits CB, CB. When opened, time t
, the current 1. ,I, is blocked.

■Since the terminal voltage Vc of the capacitor C is the peak value of the voltage source voltage V3, the voltage VCB between the poles of the test circuit breaker CB changes as the power supply voltage Vs changes ('T V (1 -
A voltage of 00s (IJ t ) will be applied. Here, the ■ value is a standard value, for example, pressure.

(2) The Weyl test device is widely used as a synthetic equivalent test device for circuit breakers, but it differs from the actual system in that the recovery voltage is DC. In order to improve this problem, the conventional
The device shown in the figure has been proposed (Japanese Unexamined Patent Publication No. 1-207
No. 079). Fig. 10 shows the current of the circuit in Fig. 10. Shows voltage waveform. Then, this synthetic equivalence test device operates as follows: (1) At time t1, auxiliary circuit breaker CB. , open the test circuit breaker CB.

■3 in the Weyl device W that is charged to a predetermined voltage in advance
When the point gap G is triggered, the current I due to the voltage cooling voltage v1 in the test circuit breaker CB changes to a current 1. superimposed on

(2) At time t, the current (2) is interrupted, and the voltage from the Weyl device W begins to be applied to the test circuit breaker CB.

(2) When the auxiliary circuit breaker C B b is closed at time t, the voltage source voltage V is applied to the test circuit breaker CB. Here, the absolute value of the voltage V is set to, for example, the rated voltage of the voltage interrupter CB applied to the first cutoff phase in the three-phase actual system.

D. Problem to be Solved by the Invention In the equivalent test (Fig. 4) for leading current interruption in item (1), a voltage of 2ff V, which is the total interpole voltage value, is applied only to terminal a on the anti-ground side of circuit breaker CB. Because of this, the electric field around the electrode is different from the actual load, and depending on the voltage class, it may exceed the commercial frequency withstand voltage value, making it impossible to conduct the test.

As shown in Fig. 6, the voltage between poles of the first cutoff phase in an actual system is (T-
A voltage of Ex-(1.5 sin ωt)4 is applied. When compared with the interelectrode voltage in this equivalent test device, the voltage in the equivalent test is lower in the shaded area, and correct performance judgment cannot be made.

In addition, in the combined power equivalence test of (2) above, as shown in FIG. As shown in the figure, the AC waveform has a peak value of F-1 EX-4. On the other hand, in this test device, as shown in FIG. 11, the voltage is applied after time t4, resulting in harsher conditions than in the actual system.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to make the inter-electrode voltage applied after disconnection the same as the voltage in the actual system. Our objective is to provide circuit breaker testing equipment.

E. Means for Solving the Problems In order to achieve the above object, the circuit breaker testing device of the present invention connects an auxiliary circuit breaker and a capacitor between the circuit breaker under test and a current source and a voltage source, respectively. In the equivalent test of leading current interruption, the specified voltage source is
and a second voltage source lower than this voltage, and a second auxiliary circuit breaker and a resistor are connected between the test circuit breaker and the first and second voltage sources, respectively, The capacitor is connected to the ground side of the test circuit breaker, and the voltage applied to the test circuit breaker is made to be the same as the actual system voltage by opening the second auxiliary circuit breaker.

In addition, a Weyl device is connected in parallel to the test circuit breaker, and the first and second auxiliary circuit breakers are connected between the test circuit breaker and the current source and voltage source, respectively, to conduct a composite test of the circuit breaker. In the voltage source, the voltage source is a first voltage source and a second voltage source lower than this voltage source, and two voltage sources are provided between the second auxiliary circuit breaker and the first and second voltage sources, respectively. By connecting three auxiliary circuit breakers and a resistor, the voltage applied to the test circuit breaker can be made to be the same as the actual system voltage by opening the third auxiliary circuit breaker.

F. Regarding the operation claim (1), the interpolation voltage of the first cutoff phase in the actual system during advance current cutoff is 1 until 1/4 cycle after the current cutoff, and after that, J"l-EX1 (1.54
8 voltages of sinωt) are applied. (E is the rated voltage of the circuit breaker under test) Since the voltage source voltage in conventional equivalent tests is constant,
You can only change the voltage after /4 cycles.

This invention provides an equivalent testing device for advanced current interruption, in which two voltage sources are used, a first and a second voltage source, and second auxiliary interruptions are provided between the circuit breaker under test and the first and second voltage sources, respectively. Since the circuit breaker and the resistor are connected, the voltage applied after the current in the test circuit breaker is interrupted can be changed by simply interrupting the second auxiliary circuit breaker. This allows the voltage applied to the test circuit breaker after current interruption to be the same as the voltage in the actual system.

Regarding claim (2), the voltage applied to the first cutoff phase in the three-phase actual system is an alternating current with a value of F, and thereafter an alternating current waveform with a peak value of F-E. Since the voltage source voltage in conventional synthesis tests is constant, the voltage cannot be changed.

The present invention provides a synthetic test device using a fill device, in which a voltage source is a first voltage source and a second voltage source, a second auxiliary circuit breaker that connects the voltage source to a circuit breaker under test, and a first and second voltage source. Since the third auxiliary breaker and the resistor were connected between the voltage source and the voltage source, the voltage applied to interrupt the current of the test circuit breaker can be changed simply by interrupting the third auxiliary breaker. This allows the voltage applied to the test circuit breaker after current interruption to be the same as the voltage in the actual system.

G. Example Examples will be described with reference to the drawings.

[Embodiment 1] FIG. 1 shows a circuit diagram of an equivalent test device for verifying the leading current breaking performance of a circuit breaker. Components that are the same as those shown in FIG. 4 are given the same reference numerals and redundant explanations will be omitted.

In FIG. 1, a transformer T is connected to a power source PO via a reactor L, and its secondary side S is used as a current source for auxiliary cutoff WCB. Connect the test circuit breaker CB via. Also,
A transformer T1 having a tapped secondary winding S is connected to the power supply PO, and terminals 1.3 and 2.3 of this secondary winding S1 are connected to the power supply PO.
are respectively used as voltage sources, and terminals 1 and 2 are respectively used as auxiliary circuit breakers CB.
b and resistor R to electrode a of the test circuit breaker CB.

Further, the capacitor C is connected between the ground side electrode b of the circuit breaker under test CB and the secondary winding ground terminal 3 of the transformer T.

Next, the operation of this embodiment will be explained with reference to FIG.

The test circuit breaker CB is connected to the secondary winding S of the transformer T, and the auxiliary circuit breaker CB. Auxiliary circuit breaker C is supplied from secondary winding terminal 1 of transformer T1 which is a voltage source.
B b , current through capacitor C? , is supplied.

Actual voltage VS+ of terminal 1 at that time is 1.5 The effective value is ■E.

4 Auxiliary circuit breaker CB. When the test circuit breaker CB is opened, a current of 1. lx is cut off, and the peak value of power supply voltage V51 remains in capacitor C. For this reason, a voltage between poles V (B is the difference between the power supply voltage V g 1 and the capacitor terminal voltage VC, 1.5 J'TE× (l-cosωt)) of the test circuit breaker is applied.

4. At this time, a current I3 is flowing through the auxiliary cutoff 5C B b and the low resistance R due to the voltage between the secondary terminals 1 and 2 of the transformer T1.

When the auxiliary circuit breaker C B b is opened between times L, and [,, the current I3 is cut off at time t3, when the current ■, becomes zero, and from then on, the resistor R is connected to the secondary terminal 2 of the transformer T, A voltage Vs is supplied through. Therefore, the interpole voltage Vca of the test circuit breaker is determined by the difference between the voltage source voltage Vg and the capacitor terminal voltage Vc, which is 1IT-Ex-(1.5+sinωt), as described above. Is the voltage waveform the same as the actual system? can get.

In Embodiment 1, in order to obtain the main voltages Vs1 and Vs2, a transformer T1 having an intermediate tap in the secondary winding is used, but as shown in FIG. 3, two transformers T. ．． T■ can be used.

[Embodiment 2] FIG. 7 shows a circuit diagram of a circuit breaker composite equivalence test device. The device shown in FIG. 7 differs from the conventional device shown in FIG. 9 in that an auxiliary circuit breaker CB is connected between the terminal l of the secondary winding of the transformer T and the auxiliary circuit breaker C I{ b, and the secondary A tap is provided in the winding, and this terminal 2 and the auxiliary circuit breaker C B b are connected by a resistor R, and the voltage from the high voltage terminal l of the transformer T and the voltage from the voltage element 2 is v tr Ex − 8 voltages of 1i nωt are output.

Next, the operation of this embodiment will be explained with reference to FIG.

Close the auxiliary circuit breaker CBc and set the auxiliary circuit breaker 754 C B a
is opened, and the auxiliary circuit breaker CB. is connected to the test circuit breaker CB from the power supply PO. A current I, is caused to flow through. Circuit breaker C at time t1
B, CB. When opened, current 1 is cut off at time t, but current I flows by the Weyl device before and after this cutoff.

At time t, auxiliary circuit breaker CB. When the circuit breaker is closed, voltage Vl is applied to the test circuit breaker CB.

When the auxiliary circuit breaker CBc is opened between time points t3 and t4, the current! 3 is interrupted at time t4, and from then on the voltage . Therefore, a waveform similar to the waveform in the actual system shown in FIG. 12 is obtained.

Note that the resistance value of the resistor R is the current I,=v. -V
2R is adjusted to a value that does not cause cutting or attenuation using the auxiliary circuit breaker CBc. The transformer T, has two transformers 21T e as shown in Figure 9.
l. It can be T rt. In addition, in order to protect the fill device W from overvoltage due to arcing, etc., an auxiliary circuit breaker is installed between A and B in Fig. 7, and an auxiliary circuit breaker is installed between A and B in Fig.
Immediately after closing a, it is better to open it and separate the Weyl apparatus.

H. Effects of the Invention Since the present invention is configured as described above, it produces the following effects.

Regarding claim (1), (1) As the voltage between the terminals of the test breaker, an AC voltage f4 can be applied to the power supply side and a DC voltage can be applied to the load side, as in the actual system.

(2) The applied heavy pressure waveform can be perfectly matched with the waveform applied to the first cutoff phase in the three-phase actual system.

■The voltage source-controlled second auxiliary circuit breaker only needs to be opened between time t and L3 (5 ms in the Z system), and does not require highly accurate control, so the control system can be simplified. .

■At time t3 when the voltage switches, the current I3 and the voltage Vs
Since the values of H Vsz are both zero, the voltages are switched without causing any transient vibration.

■Since the capacitor is used with one end grounded, there is no need to lift the entire capacitor and capacitor overvoltage suppression device, making it economical.

Regarding claim (2), (1) By switching the taps of the transformer, the applied voltage waveform can be made to completely match the waveform applied to the first cutoff phase in the three-phase actual system.

■The third auxiliary circuit breaker on the power supply side can be opened between time points t and t4 (about 5 mS in a 50 Hz system). Since highly accurate control is not required, the control system can be simplified.

■At time t4 when the voltage switches, the current l and the voltage vl
Since the values of -V= are both zero, the voltages are switched without causing any transient vibration.

[Brief explanation of drawings]

Figures 1 to 3 relate to Embodiment 1. Figure 1 is a circuit diagram of the circuit breaker testing device, Figure 2 is a time chart showing the current and voltage waveforms of each part, and Figure 3 is of the embodiment. Main part circuit diagrams showing examples, Figures 4 to 6 are related to the conventional device for Example 1, Figure 4 is a circuit diagram of a circuit breaker testing device, and Figure 5 shows current and voltage waveforms of each part. A time chart, FIG. 6 is a waveform diagram showing the difference in voltage between poles in a conventional system and an actual system, FIGS. 7 to 9 are related to Example 2, and FIG. 7 is a circuit diagram of a circuit breaker test device. , FIG. 8 is a time chart showing the current and voltage waveforms of each part, FIG. 9 is a main part circuit diagram showing one example of the embodiment, and FIGS. 10 to 12 are related to the conventional device for the second embodiment. Figure 10 is a circuit diagram of the circuit breaker test equipment, and Figure 11 shows the current at each part. FIG. 12 is a time chart showing voltage waveforms. FIG. 12 is a waveform chart showing voltage waveforms in an actual system. CB... Test circuit breaker, CB. ~CI3c... Auxiliary circuit breaker, T1. T r + + Tt1...Voltage source transformer, T1... Current source transformer, W... Weyl device. 2 others Figure 1 Figure 2 t+ b b Figure 3 Figure 4 Figure 5 Figure 6 Hama - lllft'R Figure 9 Tf2 Figure 10 Figure 11 Figure 12 t4 1 1. 1999 Patent Application No. 192221 2. Name of invention Circuit breaker testing device 3. The relationship between supplementary flooding and the rogue incident

Claims (2)

[Claims] (1) In an equivalent test for leading current interruption of a circuit breaker by connecting an auxiliary circuit breaker and a capacitor between the circuit breaker under test and a current source and a voltage source, respectively, the voltage source is connected to a first voltage source. and a second voltage source lower than this voltage.
At the same time as connecting the auxiliary breaker and resistor, the capacitor is connected to the ground side of the test circuit breaker, and the voltage applied to the test circuit breaker is made equal to the actual system voltage by opening the second auxiliary circuit breaker. A circuit breaker testing device that is characterized by being made to absorb moisture. (2) Composite test of the circuit breaker by connecting the Weyl device in parallel to the circuit breaker under test, and connecting the first and second auxiliary circuit breakers between the circuit breaker under test and the current source and voltage source, respectively. The voltage source is a first voltage source and a second voltage source lower than this voltage source, and a voltage source is provided between the second auxiliary circuit breaker and the first and second voltage sources, respectively. A circuit breaker testing device characterized by connecting a third auxiliary breaker and a resistor so that the voltage applied to the test circuit breaker can be made the same as the actual system voltage by opening the third auxiliary breaker. .