JPH03249579A - Combined breaking test device for circuit breaker - Google Patents

Abstract

PURPOSE:To obtain a combined breaking test device for circuit breaker possible to perform the breaking test in the condition closed to the actual using state of breaker by connecting a transformer in parallel with the breaker to be tested and adjusting a reactor at the secondary side of transformer. CONSTITUTION:An excitation for a short-circuited generator 1 and the value of a current limiting reactor in a circuit of current source are set so as to enable the supply of a specific breaking current Ip to the breaker 4 to be tested, thereby the current Ii of current source is supplied. In this case, a transient recovery voltage at the instantaneous time of current breaking is adjusted by a resistor 9 for adjusting the transient recovery voltage and a capacitor 10 for adjusting the same, then the recovery voltage with the frequency generated by a resonance of the circuit is impressed between the electrodes of breaker 4 to be tested. By means of adjusting a reactor 12 connected to the secondary side of transformer 11, the recovery voltage with arbitrary frequency is obtained and the combined breaking test for breaker is made possible at the frequency used in the breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a composite circuit breaker testing device, and more particularly to a composite circuit breaker testing device.

(Prior Art) Circuit breakers generally interrupt fault current when a power transmission system malfunctions. When verifying the breaking performance of such a circuit breaker at a test site, it is verified using a test circuit shown in FIG. 3, and the phenomena during the breaking test are shown and explained in FIG. 4. A direct interruption test is performed in which the short-circuit generator 1 is used as the test power source to supply the interruption current IP to the test circuit breaker 4 through the current limiting reactor 2, and then supplies the recovery voltage after the current is interrupted. The transient recovery voltage that appears between the four poles of the circuit breaker under test after current interruption is adjusted by the transient recovery voltage adjusting resistor 9 and the transient recovery voltage adjusting capacitor 10. However, if the equipment capacity for direct interrupting tests is insufficient, a composite interrupting test circuit consisting of a current source circuit that supplies a specified interrupting current and a voltage source circuit that supplies a transient recovery voltage and a recovery voltage after current interruption is used to improve the interrupting performance. Verify.

Hereinafter, a composite breaking test of a circuit breaker will be explained with reference to FIGS. 5 and 6. FIG. 5 shows an example of a composite breaking test of a circuit breaker. Short-circuit generator 1, current-limiting accelerator 2
, the auxiliary circuit breaker 3, and the circuit breaker under test 4 are connected in series to form a current source circuit. Furthermore, a series circuit of a main capacitor 6, a starting gap 7, and a voltage source reactor 8, which are charged in advance by the charging device 5, and a series circuit of a transient recovery voltage adjustment resistor 9 and a transient recovery voltage adjustment capacitor 10 connected in parallel thereto. A voltage source circuit is constructed from the circuit.

The current source circuit and the voltage source circuit are connected to the connection point between the auxiliary circuit breaker 3 and the test circuit breaker 4, and the connection point between the voltage source reactor 8 and the transient recovery voltage adjustment resistor 8, thereby forming a composite circuit breaker test device. is configured.

FIG. 6 shows phenomena during a circuit breaker test using the composite circuit breaker constructed as described above. A specified current source current I is supplied from the short circuit generator 1 through the current limiting reactor 2 and the auxiliary circuit breaker 3.
i (most part of the breaking current p) is supplied to the test circuit breaker 4. Then, at time t, the auxiliary circuit breaker 3 and the test circuit breaker 4 are opened so that the composite circuit breaker test can be performed. Current source current I
Immediately before the current zero point time t3 (approximately 400 to 500 us) at time t2, the current zero point detection bag [7a, starting control device 7b The starting gap 7 is started and the voltage source current Iv is supplied to the test circuit breaker 4 via the voltage source reactor 8. Here, the current Ii+Iv flowing through the test circuit breaker 4 becomes the breaking current IP. The current source current Ii is interrupted by the auxiliary circuit breaker 3 and the current source circuit is disconnected from the test circuit breaker 4, and the interruption current IP becomes only the voltage source current Iv, which is interrupted by the test circuit breaker 4 at time t4. Circuit breaker 4
A specified transient recovery voltage and recovery voltage Vp determined by the constants of the voltage source circuit appear between the poles of . However, according to this composite circuit breaker test device, after the current is interrupted, the recovery voltage that appears between the poles of the test circuit breaker 4 becomes a DC voltage that includes a transient recovery voltage. Since the dielectric strength after current interruption is related to the recovery voltage and the frequency, it cannot be said that it is completely equivalent to the direct interruption test shown in FIGS. 3 and 4.

Therefore, the circuit shown in FIG. 7 has been proposed as a method of applying an AC recovery voltage to the circuit breaker under test. FIG. 7 shows a circuit in which a reactor 12 is connected in parallel with the test circuit breaker 4 shown in FIG. The AC recovery voltage shown in FIG. 2 is obtained as the recovery voltage applied to the test circuit breaker by the synthetic test device. However, in general, the value of the beam axle 12 in this synthesis test apparatus is very large (several Henrys), making it difficult to realize the device.

(Problem to be Solved by the Invention) According to the circuit breaker composite breaking test device described above, the recovery voltage applied to the test circuit breaker after current interruption is a DC voltage, and a voltage different from that applied in the usage state in the power transmission system is applied. This is the cut-off test. In addition, in a synthetic test device in which a reactor is connected in parallel to the circuit breaker under test, the value of beam acceleration is very large and is difficult to realize. By adding a current limiting reactor for short-circuit testing on the side, you can easily obtain a replacement for the large-capacity glue reactor, and you can conduct a composite breaking test of the circuit breaker that enables breaking tests under conditions close to the conditions in which the circuit breaker is actually used. The goal is to provide equipment.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a current source circuit that supplies a specified breaking current to a test circuit breaker, and a specified transient recovery voltage and recovery voltage after current interruption. This is a composite circuit breaker test device consisting of a voltage source circuit that supplies a voltage source, and is characterized by connecting a transformer in parallel with the circuit breaker under test, and connecting a reactor to the secondary side of the transformer.

(Function) According to the circuit breaker synthetic test device described above, when the test circuit breaker interrupts the current at the current zero point, there is a transient recovery voltage and a recovery voltage between the poles of the test circuit breaker determined by the constants of the voltage source circuit. However, the transient recovery voltage at the instant of current interruption is adjusted by the transient recovery voltage adjustment resistor and capacitor, and the recovery voltage is adjusted by the main capacitor, voltage source reactor, and transformer connected in parallel to the circuit breaker under test. A recovery voltage at a frequency generated by resonance is applied between the poles of the circuit breaker under test. By adjusting the reactor connected to the secondary side of the transformer, a recovery voltage of any frequency can be obtained, making it possible to perform a composite breaking test of the circuit breaker at the frequency at which the circuit breaker is used (generally 50Hz or 60Hz). .

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a diagram showing an embodiment of a composite breaking test device for a circuit breaker according to the present invention. Short end generator 1, current limiting reactor 2
and is connected to the test circuit breaker 4 via the auxiliary circuit breaker 3 to form a current source circuit. Also, the main capacitor 6, starting gap 7, and voltage source reactor 8 are charged in advance by the charging device 15.
A series circuit of a resistor 9 for adjusting the transient recovery voltage, a capacitor 10 for adjusting the transient recovery voltage, and a transformer 11 are connected to the test circuit breaker 4, and a beam acdle is connected to the secondary side of the transformer 11. 12 are connected to form a voltage source circuit. The starting gap is before the current source current zero point (400 to 500μ
Current zero point detection device 7a is installed so that starting control can be performed with
, a starting control device 7b.

The operation of the present invention shown in FIG. 1 will be explained with reference to FIGS. 1 and 2. The excitation of the short circuit generator 1 of the current source circuit and the value of the current limiting reactor 2 are set so that a specified breaking current Ip can be supplied to the test circuit breaker 4, and the current source current Ii is supplied.

The test circuit breaker 4 and the auxiliary circuit breaker 3 are opened at time t1 so that the composite circuit breaker test can be performed at time t3. Current source current I
Immediately before time t3 of the zero point of i (about 400 to 500 μs)
At time t2, the starting cap 7 is started by the current zero point detection device 7a and the starting control device 7b from the main capacitor 6 charged in advance by the charging device 5, and the voltage source current Iv is transferred to the test circuit breaker 4 via the voltage source reactor 8. supply to. Here, the breaking current IP flowing through the test circuit breaker 4 is Ii+Iv.

The current source current Ii is interrupted by the auxiliary circuit breaker 3 at time t3, the current source circuit is disconnected from the test circuit breaker 4, and the interruption current Ip becomes only the voltage source current Iv and is interrupted by the test circuit breaker 4 at time t4. A specified transient recovery voltage and recovery voltage VP determined by the constants of the voltage source circuit are applied between the poles of the test circuit breaker 4. The transient recovery voltage at the instant of current interruption is adjusted by a transient recovery voltage adjustment resistor 9 and a transient recovery voltage adjustment capacitor 10.

A recovery voltage having a frequency generated by the resonance of the circuit formed by the main capacitor 6, voltage reactor 8, and transformer connected in parallel to the test circuit breaker 4 is applied between the poles of the test circuit breaker 4. By adjusting the reactor 12 connected to the secondary side of the transformer 11, a recovery voltage of any frequency can be obtained, making it possible to perform a composite breaking test of the circuit breaker at the frequency at which the circuit breaker is used.

〔Effect of the invention〕

As described above, in the present invention, in a circuit breaker composite test device consisting of a current source circuit that supplies a specified breaking current to the circuit breaker under test and a voltage source circuit that supplies a specified recovery voltage, By connecting a transformer in parallel and adjusting the voltage accelerator on the secondary side of the transformer, a recovery voltage with a resonant frequency determined by the main capacitor, voltage source reactor, and transformer circuit is applied between the poles of the test circuit breaker. This makes it possible to conduct a composite interruption test at the frequency of the system in which the circuit breaker is used. To provide a composite breaking test device for a circuit breaker that can apply an AC recovery voltage and perform a break test under conditions close to actual usage conditions, whereas conventional test devices have problems with characteristics due to the DC recovery voltage. be able to.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a composite breaking test device for a circuit breaker showing an embodiment of the present invention, FIG. 2 is a diagram showing voltage and current waveforms during a breaking test in the circuit shown in FIG. 1, and FIG. A circuit diagram of a conventional circuit breaker breaking test device that is normally performed. Fig. 4 is a diagram showing the electrical phenomenon during a breaking test in the circuit shown in Fig. 3, and Fig. 5 is a diagram showing a test using the circuit shown in Fig. 3. A circuit diagram of a composite breaking test device for circuit breakers that is generally used when the capacity is insufficient to perform a breaking test. Figure 6 is a diagram showing the electrical phenomenon during a breaking test in the circuit shown in Figure 5. Figure 7 The figure is a circuit diagram of a test device for obtaining an AC recovery voltage in a composite interruption test. 1... Short circuit generator, 2... Current limiting reactor,
3... Auxiliary circuit breaker, 4... Test circuit breaker, 5...
・Charging device, 6. Main capacitor, 7. Starting gap, 7a. Current zero point detection device, 7b...
Starting control device, 8... Voltage source reactor, 9...
Transient recovery voltage adjustment resistor, 10...Transient recovery voltage adjustment capacitor, 11...Transformer, 12...Reactor.

Claims (1)

[Claims] A test power supply, a current limiting reactor, an auxiliary breaker, and a test circuit breaker are connected in series to form a closed circuit, and a current source circuit that supplies a specified current to the test circuit breaker, a main capacitor, a starting gap, and a A voltage source circuit in which a series circuit of a voltage source reactor, a series circuit of a transient recovery voltage adjustment resistor, and a transient recovery voltage adjustment capacitor are connected in parallel to the breaker under test, and supplies a specified transient recovery voltage and recovery voltage. A synthetic breaking testing device for a circuit breaker comprising: a transformer placed in parallel with the test circuit breaker; and a reactor connected to the secondary side of the transformer.