JPS58165069A - Testing of short-circuited interruption in resistance interruption buffer type gas breaker - Google Patents

Abstract

PURPOSE:To achieve a testing of short-circuited interruption effective for the verification of utility performance of a resistance interruption buffer type gas breaker by supplying current from a medium voltage transformer in the interruption of a low voltage transformer connected to a short-circuit generator. CONSTITUTION:The parting of pole is performed in an auxiliary breaker 7 on the secondary side of a low voltage transformer 4 connected to a short-circuit generator 1 synchronizing a main contact 13 of a sample resistance interruption buffer type gas breaker 8 to interrupt current flowing from the transformer 4 whose impedance is the smallest at the zero point of current. At the same time, a specified current flow to a resistance contact 11 through a resistance 12 from a mediumvoltage transformer 5 connected to the generator 11 while a high voltage is applied to a tank 14 of the breaker 8 from a high voltage transformer 6. Thereafter, with the parting of pole, the contact 11 is cut off at the zero point of current. Since the contact 11 is cut off after the interruption of the rated current at the contact 13, the pole parting property can be tested in ample equivalence to the actual operation while an insulation testing is allowed between the contacts 11 and 13 and in the tank 14 or the like thereby affording a testing of short-circuited interruption effective for the varification of utility performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a book relating to a short-circuit breaker test method for circuit breakers used in power system substations or switchyards, particularly resistive breaker type buffer type gas circuit breakers.

As the short-circuit capacity of the system increases, the breaker capacity required of the circuit breaker also continues to increase. For this reason, synthetic tests are generally used in terminal short-circuit failure tests to verify the earth supply at the terminals of circuit breakers and the disconnection performance of short-circuit failures.

The synthetic test supplies the short circuit current from a short circuit generator at a low supply voltage, and the recovery voltage after interruption is applied from a precharged capacitor bank. Special (: In the current injection method,
Unlike the voltage superposition method in which the transient recovery voltage is applied independently of the current zero point, the high-frequency current due to the capacitor discharge is superimposed near the current zero point from the short-circuit generator, so when the current is cut off at the current zero point, the voltage is automatically cut off. Red: Transient recovery voltage is applied.

For this reason, it is said that near the current zero point, it has a high degree of individuality similar to direct testing.

However, since the current injection method requires a large capacity capacitor, it is difficult to test all points with a large capacity circuit breaker, and partial tests are often performed.

For insulator-type circuit breakers, a partial test is sufficient as it is only necessary to verify the performance between the contacts. However, in the evening type circuit breaker, the space between the sit part and the ground tank is filled with so-called hot gas that has been exposed to arc and has deteriorated dielectric strength, so this part is completely It is necessary to verify with voltage.

For this reason, for high-voltage tank-type multi-point circuit breakers, partial tests are performed using the current injection method to verify the performance between the contacts, and furthermore, between the energized part and the grounded tank, all points are tested using the voltage superimposition method. The method is to verify by testing.

Also, if the system capacity becomes extremely large and the number of break points becomes large, 1. A higher supply voltage is required to suppress current distortion caused by arc voltage, and testing at all points becomes extremely difficult even with the voltage superimposition method. For this reason, a partial test is carried out using the current injection method, the tank is placed on a disconnected stand that can withstand the full voltage, and the full voltage is applied from the evening towards the power control section using the voltage superposition method. .

Now, in order to make up for the power shortage caused by the construction of power plants in cities, we will build power plants in far away depopulated areas and send power to cities via long-distance transmission lines using 1000kV class ULTIMATE.
ra ) (high Vo%tage (UHV) power transmission is planned.

Along with this, research on switchgear for substations in UHV systems is also progressing. In order to ensure safety at UHvIII pressure, conventional air disconnection type switchgear would be a huge device, so closed type switchgear was adopted, and a tank-type buffer type gas breaker was used as a breaker. Since it is thought that 53 kA will be required as a cut-off current when the device is adopted, a large-capacity cut-off performance will be required. o'
Perform partial tests using the current injection method and float the tank on an insulated stand using the voltage superimposition method: The above method of applying voltage from the tank to the energized part is required. Let's become.

Although such a test requires relatively large-scale equipment, it is considered to be an extension of conventional technology.

However, in a UHV system, the circuit breaker must be of a resistive type. This is because the breakdown voltage in the air does not increase with the gap length and saturates, so in order to keep the insulation distance of the transmission line at a reasonable value and the construction cost at a reasonable value, the value of the switching surge must be adjusted. This is because it is necessary to keep it low.

In order to set the overvoltage multiple to the necessary 1.5 to 7 pu (= means resistance cutoff using a resistance of 500Ω to 700Ω) (=therefore, it is necessary to suppress the cutoff surge.

In a tank-type circuit breaker, unlike an insulator-type circuit breaker, the disconnection resistance and resistance contact are also housed in the same tank as the main contact. Therefore, between the resistive contact and the main contact (at:
Also, hot gas is released (=), and it is also necessary to verify the recovery of the cannon during this time.

sc, :[A&biased. 12.2. . □1.15□””
""""'''ll: A method is adopted in which the contacts are driven from the same direction.

The breaking resistor is generally attached to the fixed contact side, but if sufficient space is to be utilized, the operating rod of the resistive contact may be made an insulator and attached to the movable contact side.

When the main contact is closed, there is no potential difference between the main contact and the resistive contact. However, when the main contact is cut off and the current is commutated to the resistance contact, a voltage drop occurs between the resistance C2 and the fixed contact side of the main contact and the fixed contact side of the resistance contact, or between the movable contact side of the main contact. A potential difference ζ=potential is generated between the movable contact side of the resistance contact and the movable contact side of the resistance contact.

Insulation recovery between the main contact and the resistive contact exposed to hot gas cannot be verified using conventional testing methods, and a new method is required.

In addition, in a buffer type gas breaker, the driving force of the operating mechanism is used to move the cylinder, and the gas is compressed by the relative movement with the piston, producing high-pressure gas. It is blown to extinguish the arc at the current zero point and shut off. At this time, the gas outlet is closed by an arc, so the pressure of the compressed gas varies depending on whether or not the current is interrupted. Therefore, the opening operation characteristics differ depending on whether or not current is interrupted. On the other hand, in the resistive cutoff method, the common method is to drive the resistive contact and the cutoff contact with the same operating mechanism, so when verifying the cutoff performance of the resistive contact, C2 also requires current cutoff of the main contact. Become.

The present invention was made in view of the above two points, and the present invention has been made to provide a new type of resistance-contact buffer-type gas circuit breaker capable of conducting highly unique short-circuit tests on buffer-type gas circuit breakers using resistance contact materials. The purpose of this invention is to provide a short-circuit breaker test method.

The configuration of the present invention will be explained with reference to the embodiment shown in FIG. Connect to the primary side. The secondary side of the transformer 4, which generates a low voltage, is connected to one terminal 9a of a test breaker 8 via an auxiliary breaker 7, and the other terminal 9b of the breaker 8 is grounded. The secondary side of the transformer 5 that generates medium voltage is connected to one terminal 9 of the test breaker 8.
connected to a, further (=transformer 6-2 which generates high voltage)
The next side shall be connected to the grounding tank 14 of the test breaker 8 which is insulated and supported by an insulating frame toastob.

The terminals 9m and 9b of the test circuit breaker 8 are each insulated from the grounding tank 14 with an insulator, and between the two terminals 9a and 9b, a main contact 13 and a resistor 12 are connected in parallel to the main contact 13.
These are also housed insulated from the tank 14. The main contact 13 includes a fixed electrode and a movable electrode, and an operation mechanism that drives the movable electrode drives a buffer cylinder provided behind the movable electrode, and a buffer piston inserted into the buffer cylinder is connected to the main contact 13. The structure is such that the gas pressure in the chamber is raised one step, and this pressurized gas is sprayed onto the arc generated between the electrodes to extinguish the arc.

Next, the effect of the present invention 1 = ``CC explanation. First, the protective breaker 3, the auxiliary breaker - 7, and the test breaker 8 are inserted (in a closed state, role, :' When the main breaker 2 is inserted, 1.: From the excited generator 1; the cicada fault current flows to the main contact 13 of the test breaker 8 through the low-pressure bladder pressure device 4 with the lowest impedance. When the auxiliary circuit breaker 7 is opened and cut off at the current zero point, the resistor contact 1 is connected from the medium voltage transformer 5 via the resistor 12.
A current flows through the tank 14C, and a voltage is applied from the high voltage transformer 6 to the tank 14C. At this time, medium voltage transformer 5
If the short-circuit actance including the resistance is set to a value sufficiently lower than the breaking resistance, a predetermined current will flow through the resistance contact 11. Thereafter, the resistance contact 11 is opened and cut off at the current zero point.

According to this embodiment, the resistor contact 11 is cut off after the rated cutoff current is cut off at the main contact 13, so that the cut-off test of the resistor contact 11 can be carried out with the opening characteristics fully equivalent to the actual state. incur In addition, after the main contact 13 is cut off, current flows through the resistor 121, resulting in a voltage drop, and the insulation between the resistive contact 11 and the main contact 1'3 can be sufficiently verified. :The high voltage transformer 6 to 'j can apply □ voltage to the tank 14 and create a potential difference between the tank 14 and the energized part, so the insulation between the tank 14 and the energized part can also be This is extremely effective because it can simulate not only what happens after the main contact 13 is cut off, but also what happens after the resistance contact 11 is cut off.

Next, another embodiment of the present invention will be described with reference to FIG. In the above-mentioned embodiment, the short-circuit generator 1 that supplies the short-circuit current is converted into a high-voltage transformer@! #6, and a voltage was applied to the tank 14 from this.

In this embodiment, the main capacitor 18 is connected to the charging unit 2.
The detector 21 detects the current flowing through the main contact 13 or the current flowing through the resistance contact 11, and at the current zero point, a signal is output from the pulse generator 22, the switch 19 is closed, and the tank 14 is charged. There are some that apply voltage from the main capacitor IF3. The waveform is adjusted by the reactor 17, resistor 15, and waveform adjustment capacitor 16 so as to simulate the transient recovery voltage after the cutoff.

In this case, the current zero point of the current of the main contact 13 and the resistance contact 11
It is necessary to apply a voltage to the tank 14 at both the current zero point of the current, and there are multiple tests. However, in the case of the above embodiment, the transient recovery voltage is applied from the transformer, so the waveform that can be applied as the transient recovery voltage is limited. In contrast, Jin's embodiment has the advantage of being able to freely select the waveform.

In the present invention □, the main contact 13, the resistor 12, and the resistance contact 11 are housed in the same tank 14. However, when they are housed separately, the voltage between the main contact 13 and the resistance contact 11 is Application is no longer necessary. However, as long as the main contact 13 and the resistance contact 11 are driven by the same operating mechanism, this test method is applicable.

Regarding insulator-type circuit breakers, there is no need to verify the insulation between the tank and the energized part, which was necessary for tank-type circuit breakers, so the transformer 6 in Figure 1 is not required, and Figure 2 In this case, main capacitor 18# is unnecessary, but the same overall test method is applied.

Further, although the short-circuit generator, the input device 2 for inputting and disconnecting the generator, and the purulent breaker 3# are shown as one set, the same effect can be achieved even if a plurality of sets are used. Moreover, two transformers C may be used, a plurality of transformers may be used, and low voltage and high voltage may be obtained from three taps of one transformer.

As explained above, in the short-circuit breaker test of a resistance-blocking type buffer type gas breaker, the present invention connects a short-circuit generator to two transformers that generate low and medium voltages through an injector and a membrane breaker. The low-voltage transformer is connected to one terminal of the test breaker through an auxiliary breaker, and the medium-voltage transformer is directly connected to the same terminal of the test breaker. By grounding the other end of the disconnector under test,
The short-circuit current to the main contact is supplied from the low-voltage transformer, and when the main contact is cut off, the C2 auxiliary cut-off is cut off, and the current is supplied from the medium-voltage transformer to the resistive contact via the cut-off resistor. Second, it is possible to test the operating characteristics under the influence of nozzle closure due to the arc of the main contact. In addition, if the main contact, resistance contact, and resistor are housed in the same tank, it is possible to conduct a test that can sufficiently verify the insulation recovery between the main contact and the resistance contact, and also to By connecting the primary of a high-voltage transformer to the short-circuit generator described above, or by applying voltage to a tank installed on an insulating pedestal, by closing a switch at the current zero point using a pre-charged nine capacitor, It is possible to verify the insulation between the tank and the energized part of a grounded tank-type gas circuit breaker, providing a highly cost-effective short-circuit breaker test method that is effective for verifying practical performance.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams showing short-circuit test circuits for tank-type buffer type gas circuit breakers of resistance cutoff type according to different embodiments of the present invention. 1... Short-circuit generator 2... Injector 3... Safety breaker 4... Low voltage transformer 5... Medium voltage transformer
6...High voltage transformer 7...Auxiliary breaker 1y'
8... Test disconnector ゛, 9a, 9b... One terminal:, 10a l l□
b,,,Insulation stand 11...Resistance contact:...:12...
・Resistance□

Claims (3)

[Claims] (1) A breaking resistor is connected in parallel to a main contact via a resistance contact, and the main contact is equipped with a fixed electrode and a movable electrode. The operation mechanism that drives the buffer cylinder installed at the rear drives the paraffer cylinder installed at the rear of the movable electrode, and the gas in the buffer cylinder is In the short-circuit breaker test, the output of the short-circuit generator is transferred to the low-pressure and Connect to the primary side of at least one transformer that generates medium voltage, and connect the low-voltage secondary side of the transformer to the me lead-out terminal C of the buffer type gas breaker under test via an auxiliary breaker. ;
The medium-voltage secondary of the transformer is directly connected to the negative side lead-out terminal, and the other side lead-out terminal of the test buffer type gas breaker is grounded to prevent short-circuit current to the main contact. Resistance cutoff type buffer type gas that is supplied from the low voltage secondary side of the transformer, cuts off the auxiliary breaker at the same time as the main contact is cut off, and supplies current from the medium voltage secondary side of the transformer via the cutoff resistor. Short-circuit breaker test method. (2) A breaking resistance is installed in a grounded tank containing disconnection gas.
are connected in parallel to the main contact via a resistance contact, the main contact is equipped with a fixed electrode and a movable electrode, and the operating mechanism for driving the movable electrode is a □ buffer amelinda provided behind the movable electrode. Short-circuit breaker is a buffer-type gas breaker that drives the packer cylinder and the inserted buffer piston to increase the gas pressure in the buffer cylinder and extinguish the arc generated between the electrodes by blowing pressure gas. Exam C
: At least one transformer supporting the grounded tank through an insulator and generating low, medium and high voltages from the output of the 11 short-circuit generators through a closing device and a protective circuit breaker. The low-voltage secondary side of the transformer is connected to the lead-out terminal on one side of the test buffer type gas breaker via an auxiliary breaker, and the medium-voltage secondary side of the transformer is directly connected to the primary side of the transformer. Connect to the negative side base terminal, ground the other side lead-out terminal of the buffer type gas breaker under test, and connect the high voltage secondary side of the transformer to the tank of the buffer type gas breaker under test. And so,
The short circuit current to the main contacts is supplied from the low voltage secondary side of the transformer,
After the main contact is cut off = the auxiliary breaker is cut off and current is supplied from the medium voltage secondary side of the transformer via the breaker resistor, and at the same time from the high voltage secondary side of the transformer to the tank of the test buffer type gas breaker A short-circuit breaker test method for a resistance breaker type buffer type gas breaker in which a voltage is applied to the breaker. (3) Filled with insulating gas. :) Breaking in the ground tank, ・1: Main contact C;, 1' Parallel 1: Connected and configured, the main contact is equipped with a fixed electrode and a movable electrode, and the movable electrode, [ 1] The operation mechanism that drives the 1° pole drives the buffer cylinder that is bifurcated at the rear of the movable electrode, and the gas pressure in the buffer cylinder is increased between the buffer piston inserted in the buffer cylinder and the gap between the electrodes is increased. In a short-circuit breaker test of a buffer type gas breaker that extinguishes an arc generated by blowing pressure gas, the grounded tank is supported via an insulator,
Short-circuit the output of the generator to low voltage through the input device and protective breaker. and at least one transformer generating medium voltage.
The low-voltage secondary side of the transformer is connected to one lead-out terminal of the test buffer type gas breaker through an auxiliary breaker, and the medium-voltage secondary side of the transformer is directly connected to the secondary side of the transformer. Side lead-out terminal: Two leads are connected, and the lead-out terminal on the other side of the test buffer type gas breaker is grounded.The short-circuit current to the main contact is supplied from the low-voltage secondary side of the transformer, and after the main contact is cut off, The auxiliary breaker is cut off, current is supplied from the medium-voltage secondary side of the transformer via the cutoff resistor, and the sample buffer type gas v 11 A flue duct cutoff test method for a resistance cutoff buffer type gas breaker in which a voltage is applied to the tank of the breaker.