JPH04290976A - Performance verification method of resistance type circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a resistance interrupting type circuit breaker, and in particular, uses a low voltage current source to evaluate the effect of hot gas generated in the main interrupting section on the interpole insulation recovery characteristics of the resistive interrupting section. This paper relates to a performance verification method for resistive circuit breakers that can be verified using equivalent test methods.

0002

[Prior art] Conventional circuit breakers include air circuit breakers that use resistance breaking to reduce the rate of rise in transient recovery voltage during current interruption, but gas circuit breakers with excellent breaking performance have been applied to resistance breaking. There are relatively few examples. Very high operating voltage 10
In 00 kV class UHV power transmission systems, resistive interrupting is considered effective in suppressing switching surge levels to a low level and keeping equipment insulation distances at practical levels. When verifying the performance of such resistive circuit breakers, the main focus of interest in conventional air circuit breakers was the breaking performance of the main circuit breaker, whereas in recent gas circuit breakers, the main circuit breaker's current interruption performance was The insulation recovery characteristics between electrodes and ground insulation performance are also becoming important verification items.

[0003] In the breaking test method for a resistance breaking type circuit breaker, it is necessary to supply tens of thousands of amperes to the main breaking section, and several thousand amperes of current to the resistor circuit after the current in the main breaking section is interrupted. Supplying this with a single power supply requires low impedance and high voltage at the same time, which requires a power supply capacity equivalent to that of the actual system, which is impossible with the power supply capacity of ordinary test equipment.

[0004] In order to avoid this, a method can be considered in which the interrupting performance of the main interrupting section and the resistive interrupting section are individually verified. The interrupting performance required for the main interrupter and the resistance interrupter, i.e.
This is a method in which the interrupting current and recovery voltage are individually determined by means such as analysis, and predetermined interrupting currents and recovery voltages are individually supplied to evaluate whether or not interrupting is possible.

Furthermore, in order to solve this problem, Japanese Patent Application Laid-open No. 58-165069 uses separate power supplies for applying current to the main interrupting section and for applying current to the resistive interrupting section. We are proposing a method of switching off the power supply by cutting off the auxiliary cutoff section in synchronization with the cutoff.

[0006]

Problems to be Solved by the Invention The method of verifying the interrupting performance of the main interrupter and the resistance interrupter separately has the following problems when verifying the performance of the resistor interrupter. In a puffer-type circuit breaker commonly used as a large-capacity circuit breaker, the rise in pressure in the puffer chamber, that is, the operational reaction force applied to the operating device, depends on the breaking current. In the method of individually verifying, the influence of the main interrupting section arc is not simulated when verifying the interrupting performance of the resistive interrupting section, resulting in inaccurate performance evaluation. There is also the problem that hot gas discharged from the main breaker, which shuts off first, stays in the space between the breaker electrodes and affects the interelectrode insulation recovery characteristics of the resistance breaker, but this issue has not been verified. do not have.

[0007] In the method of applying current to the main circuit breaker and the resistance circuit breaker using separate power supplies, two transformers are required in the current source circuit, so the test circuit configuration becomes large-scale, and the auxiliary circuit breaker Problems arise, such as the need for highly precise control of the shut-off time.

An object of the present invention is to provide a synthetic test method for a resistance interrupting type circuit breaker that can verify the influence of hot gas generated in the main interrupting section on the interpole insulation recovery characteristics of the resistive interrupting section.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention applies a predetermined breaking current to the main interrupting part with respect to the output voltage of the shorted generator of the current source circuit and the winding ratio of the shorted transformer. A reactor with a reactance that can be supplied is used, and a resistor with a value that can supply a predetermined breaking current to the resistance breaking section for these circuit constants is used.

0010

[Operation] The power supply back capacity is different between current interruption in a power system and current interruption in a synthetic test circuit, and if the current is simply interrupted, the interruption currents of the main interruption section and the resistance interruption section cannot be matched at the same time. On the other hand, in order to match the breaking current of the main breaking section, the reactance of the current adjustment reactor is adjusted, and the resistance value of the resistor is adjusted to match the breaking current of the resistance breaking section. It is possible to match the breaking current of the resistance breaking section with the regular breaking current value.

[0011]

[Embodiment] An embodiment of the present invention is shown in FIG. Although the figure shows a single-phase test circuit, the basic concept is the same for three-phase tests. In the figure, the 6 circuits of the primary winding of the short-circuit transformer 5 include the short-circuit generator 1, backup circuit breakers 2, 2'
, closing switch 3, 3', current adjustment reactor 4, 4
', and the secondary winding 6' serves as a circuit for an auxiliary circuit breaker 7 and a circuit breaker under test 8. These circuits are called
The current source circuit 13 is a low impedance circuit that supplies a breaking current to the test circuit breaker 8, and is a large current circuit with a lower voltage than the actual system in which the test circuit breaker 8 is put into practical use. A high-voltage, small-current voltage source circuit 12 is separately connected to the test circuit breaker 8, and supplies the circuit breaker with a recovery voltage after current interruption. The voltage source circuit 12 includes a precharged power supply capacitor Cv, a gap G, a reactor Lv, a waveform adjustment resistor Rf, a capacitor Cf, and the like.

The procedure for the synthetic blocking test will now be explained. In the initial state, the backup circuit breaker 2, the auxiliary circuit breaker 7, and the test circuit breaker 8 are closed, and the closing switch 3 is open. When the test control device turns on the closing switch 3, a current source current flows from the short-circuit generator 1 to the test circuit breaker 8 via the short-circuit transformer 5. After a certain predetermined period of time has elapsed, the auxiliary circuit breaker 7 and the test circuit breaker 8 open at approximately the same time to interrupt the current source current. Concurrently, in accordance with the procedure of the so-called voltage superposition method, the starting gap G of the voltage source circuit 12 is triggered immediately after the current interruption is detected by the current measuring resistor SR, and a minute delay of Δt from the current zero point is generated. After a period of time, a high voltage recovery voltage is applied.

At this time, in the test circuit breaker 8, a series circuit of a resistor 10 and a resistive circuit breaker 11 is connected in parallel with the main circuit breaker 9. Looking at the current interrupting situation in more detail in Figure 2, first, when a interrupting command is issued from an external control device, the main interrupting section operates and opens, and the current Ic flowing through the main interrupting section is reduced to the current zero point at time t1. The current commutated to the circuit of the resistor 10 and flowing through the circuit breaker becomes the current Ir limited by the resistor 10. After a predetermined period of time has elapsed, the resistance cut-off section opens with a delay due to an electrical or mechanical delay means, and the resistance current Ir limited by the resistor is cut off at the current zero point at time t2. After a minute delay time Δt necessary for control, a recovery voltage TRV is applied from the voltage source circuit, withstands this voltage, all electrodes reach the cutoff position, and the current cutoff ends.

With this configuration, the current Ic flowing through the main cutoff section 9 is controlled by adjusting the generator voltage V and the reactance Xl of the reactor 4. Furthermore, the resistance current Ir can be similarly obtained by adjusting the resistance value R so that a predetermined breaking current can be obtained in the resistance breaking section. Therefore,
It is also possible to simulate a cutoff condition that closely simulates the increase in puffer chamber pressure due to cutoff current, that is, the operation reaction force applied to the operating device.

[0015] To show the test conditions with specific numerical values, for example, 1100kV equipped with a corresponding breaking resistance of 750Ω.
When testing a circuit breaker using a current source circuit with a voltage of 10 kV under a step-out interrupting condition in which the voltage doubles, the resistance current Ir [A] is

[0016]

[Math 1]

[0017] When using a current source circuit with a test voltage of 10 kV, the required resistance value R [Ω] is:

0018
]

[Math 2]

[0019] If a 1100kV circuit breaker is configured with six points, the resistance value installed at each point will be approximately 1Ω.

[0020] As a different example, the interrupting resistance can be set to 200
Similarly, when conducting a break test using a current source circuit with a voltage of 20 kV for a terminal short-circuit fault break of a 242 kV single-break circuit breaker equipped with 0Ω, the resistance current Ir [A] is similarly

002
1]

[Math 3]

When using a current source circuit with a test voltage of 20 kV, the required resistance value R [Ω] is:

[0023]

[Math 4]

[0024] Therefore, the applicable range of the resistor provided during the interruption test according to the present invention is about 1Ω to 300Ω. Along with this, the amount of heat generated in the resistor changes,
If the time for one energization is 30 ms, the amount of heat generated by the resistor is 500 kJ and 42 kJ in the above two examples, respectively. This is very small compared to the value in an actual system, and considering the degree of freedom in manufacturing, metal resistors are more suitable than carbon ceramic resistors, etc., which are generally used as resistors. As an example, if the former resistor is constructed using a nichrome material, it is possible to use a material with a diameter of 3 mm and a length of 30 m, and construct it in a spiral shape or as a non-inductive winding.

Although the embodiment shown in FIG. 1 uses a pre-charged LC circuit, a voltage source using a generator and a step-up transformer as shown in FIG. 3 may also be used. This circuit configuration is similar to the current source circuit in FIG. There is. A protective resistor 26 of about 10 kΩ may be inserted on the secondary side of the step-up transformer 25. The generator may also be used for the current source, and the temporary winding of the step-up transformer 25 may be connected in cascade to the temporary winding of the short-circuit transformer 5 of the current source shown in FIG.

As shown in FIG. 4, the auxiliary bushing 31
It is also possible to erect it using an inspection manhole provided in the case of the circuit breaker, and electrically connect the wiring 32 connected to the voltage source 12 to the connection point 33 between the resistor 10 and the resistance interrupter 11. It is. By configuring like this,
A configuration suitable for a so-called current superimposition method test as shown in FIG. 5 can be adopted. That is, as shown in FIG. 5, prior to the final cutoff time t2 of the resistance current Ir, the
In this method, the gap G in FIG. 1 is discharged and the voltage source current Iv is passed for half a wave, and then this is cut off and the voltage source voltage TRV is applied. By configuring as shown in Fig. 4, voltage source current I
Since v does not need to flow through the resistor 10, there is no attenuation during current flow, improving efficiency.

FIG. 6 shows the case where the present invention is applied to a two-point circuit breaker, and the test bushing 3 is installed in the middle part as in the previous example.
It stands at 1. The wiring 34 coming out from one terminal is directly connected to the secondary side of the shorting transformer, and the other terminal 35 is grounded. The wiring 32 drawn out from the middle part is connected to the middle part 36 of the two cutoff parts. By connecting in this manner, one of the circuit breakers 37 is used as an auxiliary circuit breaker, and the other circuit breaker 38 is used as a test circuit breaker. The resistor may be divided into two parts and distributed to both cut-off parts, but
As in this example, the auxiliary cutoff section 37 may be equipped with the entire required value, and the resistor on the test cutoff section 38 side may be short-circuited. During the interrupt test, the main interrupter connects the resistor 10 and the resistor interrupter 11, 11'.
Since the current commutated into the circuit is limited by the resistor 10, a predetermined resistance current Ir can be obtained by adjusting the resistance value R of the resistor 10 to a predetermined value. By doing so, only one resistor is required, and verification using the current superimposition method as described in the previous example is made possible.

The example shown in the previous example shows a unit test for verifying the breaking performance of a multi-point circuit breaker at one point, but when testing all points of a multi-point circuit breaker, a plurality of circuit breakers shown in FIG. There is no essential difference since they are simply connected in series.

[0029]

According to the present invention, in a synthetic test circuit for verifying the breaking performance of a resistance breaking type circuit breaker, in order to match the breaking current of the main breaking part, the reactance of the current adjustment reactor is changed to the reactance of the resistance breaking part. By adjusting the resistance value of the resistor to match the interrupting current, the interrupting current is made to match the regular interrupting current value, which reduces the power supply backside capacity when interrupting current in power systems and in synthetic test circuits. Despite the differences, we considered the effect of the hot gas generated in the main cut-off part on the breaking performance of the resistance cut-off part, and created a power supply that does not have a large-scale configuration and has a capacity that is used for ordinary synthesis tests. It is possible to develop a synthetic test method for resistive circuit breakers whose performance can be verified using

[Brief explanation of the drawing]

FIG. 1 is a synthetic test circuit diagram of a resistance interrupting type circuit breaker showing one embodiment of the present invention.

FIG. 2 is a current and voltage chart diagram of the embodiment shown in FIG.

FIG. 3 is a voltage source circuit diagram of a different embodiment.

FIG. 4 is an explanatory diagram of a test circuit breaker configuration of a different example.

5 is a current and voltage chart diagram of the embodiment shown in FIG. 4. FIG.

FIG. 6 is a circuit diagram of a test circuit breaker according to a different embodiment.

[Explanation of symbols]

1... Short circuit generator, 2, 2'... Backup circuit breaker, 3,
3'... Closing switch, 4, 4'... Current adjustment reactor, 5... Short circuit transformer, 6... Primary winding, 6'... Secondary winding, 7
…Auxiliary circuit breaker, 8… Test circuit breaker, 9… Main circuit breaker, 10…
Resistor, 11... Resistance cutoff section, 12... Voltage source circuit.

Claims (6)

[Claims] Claims: 1. A main interrupting section consisting of a pair of fixed electrodes and a movable electrode; a resistive interrupting section consisting of a pair of fixed electrodes and a movable electrode; and a resistor. A resistance breaking type circuit breaker in which a resistance current is commutated to the resistor and interrupted by a breaking operation of the resistance breaking unit, and a short circuit power generation device that supplies a breaking current to the circuit breaker during performance verification of the resistance breaking type circuit breaker. A current source circuit consisting of a switch, a control switch, a reactor, a short-circuit transformer, etc.
A high voltage source that applies a recovery voltage to the breaker after the breaker interrupts the interrupting current supplied from the current source circuit, wherein the output voltage of the short-circuit generator and the short-circuit transformer Using a reactor having a value that can supply a predetermined breaking current to the main interrupting section, for the turns ratio of the short-circuit generator, the turns ratio of the short-circuit transformer, and the reactance of the reactor. . A method for verifying the performance of a resistance interrupting circuit breaker, characterized in that a resistor having a resistance value capable of supplying a predetermined interrupting current to the resistance interrupting section is used. 2. A performance verification method for a resistance interrupting type circuit breaker according to claim 1, wherein the resistor is composed of a thin rod-like or wire-like metal resistor. 3. The method for verifying the performance of a resistance interrupting circuit breaker according to claim 1, wherein the resistance value of the resistor is in the range of about 1Ω to 300Ω. 4. A performance verification method for a resistance interrupting circuit breaker according to claim 1, wherein the voltage source is electrically connected to a connection point between the resistor and the resistance interrupting section. 5. A performance verification method for a resistance circuit breaker according to claim 1, in which a resistor on the test circuit breaker side is short-circuited when one point of the multi-point circuit breaker is used as an auxiliary circuit breaker. . 6. A main interrupting section consisting of a pair of fixed electrodes and a movable electrode, a resistance interrupting section consisting of a pair of fixed electrodes and a movable electrode, and a resistor, and one terminal of the resistance interrupting section and one terminal of the resistor. An electrically connected series circuit is connected in parallel with the main interrupting section, or one terminal of the parallel circuit of the resistor and the main interrupting section is electrically connected in series with one terminal of the resistive interrupting section. When verifying the interrupting performance by an equivalent test using a combination circuit of a current source and a voltage source with a voltage lower than the actual system conditions, it was found that the resistance value of the resistor was made smaller than the normal practical value. A performance verification method for characteristic resistance-type circuit breakers.