JP5175521B2 - Lightning arrester discharge test device and lightning arrester discharge test method - Google Patents

Description

  The present invention relates to a pressure release test method performed by applying a large current to a lightning arrester and a test apparatus therefor.

  Lightning arresters are installed between the grid and the ground in various electrical equipment such as heavy electrical equipment, power distribution equipment, and trains in order to suppress various overvoltages applied to these equipment and protect the insulation of the equipment. . In order to design this arrester, it must have a structure that satisfies the specifications and test standards. The test standard shows the contents corresponding to the domestic and foreign countries. The lightning arrester describes the verification method when a large current is energized in the standard items, and is an essential item as a type test.

  The structure of the arrester has been improved from the previous gap type to the gapless type using the current non-linear characteristic element. Examples of the lightning arrester that accommodates the element include an insulator type, a tank type, and a polymer type in which an insulating resin is in direct contact with the outer periphery of the element.

  In the verification of energizing a large current according to the test standard, these lightning arresters must have a pressure relief structure from the viewpoint of public safety in order to avoid electrical explosions immediately without explosive scattering or spreading. It is shown in the test standard that this is not possible. For lightning arresters that are currently commercialized, it is necessary to verify performance and determine pass / fail by using test facilities and methods that satisfy domestic and international test standards.

In the discharge test shown in the domestic lightning arrester test standard, a specified current is applied for a specified time in a state where the upper and lower terminals are short-circuited with a fuse wire between the insulator or molded inner surface of the arrester and the element, It is verified whether or not explosive scattering or fire spread continues due to the operation of the pressure relief structure (see Patent Document 1).
JP 2000-147040 A

  The new release test content was documented in the international test standard IEC60099-4 Edi2-1 (2006-07). This pressure release test method enables energization of a large current without attaching a fuse wire inside, and verifies the performance of the test lightning arrester when energized with a large current.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to verify the pressure release performance without impairing the lightning arrester characteristics in a pressure release test in which a large current is passed through the lightning arrester.

  In order to achieve the above object, one embodiment of a lightning arrester discharge test apparatus according to the present invention includes a first low-voltage winding connected to a first AC power source, and a first high-voltage winding having one end grounded. A high current source transformer having a wire, a second low voltage winding connected to a second AC power source, and a second high voltage winding connected in parallel to the first high voltage winding. A high-voltage source transformer provided; first switching means connected in series to the first low-voltage winding and the first AC power supply; and series connection to the second low-voltage winding and the second AC power supply. A second opening / closing means connected to the test lightning arrester, a test lightning arrester connection line connecting the test lightning arrester in parallel to the first high voltage winding and the second high voltage winding, and the second high voltage winding. And an auxiliary circuit breaker connected in series to the first high-voltage winding.

  Another aspect of the lightning arrester discharge test apparatus according to the present invention is a large current including a first low-voltage winding connected to an AC power source and a first high-voltage winding having one end grounded. A source transformer; a second low-voltage winding connected in parallel to the first low-voltage winding; and a second high-voltage winding connected in parallel to the first high-voltage winding. A high voltage source transformer, a first switching means connected in series with the first low voltage winding and an AC power source, and a test lightning arrester as the first high voltage winding and the second high voltage winding. A test lightning arrester connection line connected in parallel to the current detector, a current detector for detecting a current flowing through the second high-voltage winding, and a first auxiliary cutoff connected in series to the first high-voltage winding A second auxiliary circuit breaker connected in series with the second high voltage winding, and a second auxiliary circuit breaker connected in series with the second high voltage winding and the second auxiliary circuit breaker. And a connected reactor.

  Moreover, one aspect of the lightning arrester discharge test method according to the present invention is a lightning arrester discharge test method using a lightning arrester discharge test device, which is connected to a first AC power source. A large current source transformer comprising a first low voltage winding formed, a first high voltage winding having one end grounded, a second low voltage winding connected to a second AC power source, A high voltage source transformer comprising a second high voltage winding connected in parallel to the first high voltage winding; and a first connected in series to the first low voltage winding and the first AC power source. Switching means, second switching means connected in series to the second low-voltage winding and the second AC power source, and a test lightning arrester to the first high-voltage winding and the second high-voltage winding. A test lightning arrester connection line connected in parallel, a current detector for detecting a current flowing through the second high voltage winding, and the first high voltage An auxiliary circuit breaker connected in series to the wire, and the pressure release test method is a step of closing the second switching means from the open state when the first switching means and the auxiliary circuit breaker are open. And passing a current through the second arrester via the second high-voltage winding, and opening a second switching means after a predetermined time, and stopping a current from flowing through the second arrester. Further, after a predetermined time, the auxiliary circuit breaker is closed, the first switching means is closed, and a current is passed through the first lightning arrester through the first high-voltage winding, and a predetermined time later And opening the auxiliary circuit breaker, further opening the first opening / closing means, and stopping a current from flowing through the lightning arrester.

  Another aspect of the lightning arrester discharge test method according to the present invention is a lightning arrester discharge test method using a lightning arrester discharge test device, wherein the lightning arrester discharge test device is connected to an AC power source. A high current source transformer having a first low voltage winding and a first high voltage winding grounded at one end, and a second low voltage connected in parallel to the first low voltage winding. A high voltage source transformer comprising a voltage winding and a second high voltage winding connected in parallel to the first high voltage winding; and connected in series to the first low voltage winding and the AC power source A first switching means, a test lightning arrester connection line connecting the test lightning arrester in parallel with the first high voltage winding and the second high voltage winding, and a current flowing through the second high voltage winding; A current detector for detecting the voltage, a first auxiliary circuit breaker connected in series with the first high voltage winding, and a series with the second high voltage winding. A second auxiliary circuit breaker connected to the second high voltage winding and a reactor connected in series to the second auxiliary circuit breaker. Opening and closing means, closing the first auxiliary circuit breaker with the second auxiliary circuit breaker turned on, and passing a current through the second arrester through the second high voltage winding and reactor; , After a predetermined time, opening the second auxiliary circuit breaker to stop the current flow to the test arrester, and after a predetermined time, closing the first auxiliary circuit breaker, Passing a current through the first lightning arrester through the first high-voltage winding, and after a predetermined time, opening the first auxiliary circuit breaker, further opening the first opening / closing means, Step to stop current from flowing through the lightning arrester And having a flop, a.

  According to the present invention, in a discharge test in which a large current is passed through a lightning arrester, a trigger fuse wire is not attached between the lightning arrester element and the outer tube container, and the surface of the insulating container structure is not cut. A large current can be applied. Thereby, the pressure release performance can be verified without impairing the lightning arrester characteristics.

  Embodiments of a lightning arrester discharge test device and a lightning arrester discharge test method according to the present invention will be described below with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a circuit diagram showing a first embodiment of a lightning arrester discharge test apparatus according to the present invention, and FIG. 2 is a sequence flow diagram in the lightning arrester discharge test apparatus of FIG.

  As shown in FIG. 1, the high current source transformer 6 has a first low voltage winding 6a and a first high voltage winding 6b, and the high voltage source transformer 10 has a second low voltage winding 10a and a first low voltage winding 10a. 2 high-voltage windings 10b.

  A first protective circuit breaker 4, a first input switch 5, a first reactor 30, and a first low-voltage winding 6a are connected in series to a first short-circuit generator (first AC power source) 1. Closed circuit. In addition, a second short circuit generator (second AC power supply) 2 is connected in series with a second protective circuit breaker 8, a second closing switch 9, a second reactor 31, and a second low voltage winding 10a. Connected to form a closed circuit. The first protective circuit breaker 4 and the first closing switch 5 constitute a first switching means, and the second protective circuit breaker 8 and the second closing switch 9 constitute a second switching means. Yes.

  The lower terminal 6c of the first high voltage winding 6b is connected to the lower terminal 33 of the test lightning arrester 3 via the large current side current detector 32, and the lower terminal 33 is grounded. A large current 18 passing through the test lightning arrester 3 can be detected by the large current side current detector 32.

  The upper terminal 6 d of the first high-voltage winding 6 b is connected to the upper terminal 34 of the test lightning arrester 3 via the auxiliary circuit breaker 12. The test lightning arrester 3 is disposed between the lower terminal 33 and the upper terminal 34, and these are connected to each other by a test lightning arrester connection line 35.

  Further, the lower terminal 10 c of the second high voltage winding 10 b is connected to the lower terminal 33 of the test lightning arrester 3 via the high voltage side current detector 13. A high voltage side current detector 13 can detect a TOV (temporary overvoltage) current 19. The high voltage side current detector 13 includes a part for detecting a current of several tens of A and a part for detecting a current of a few tens of mA. The part that detects several tens of mA is configured to be bypassed by a device with high responsiveness such as a diode in order to protect the measuring unit device in the several A region.

  The upper terminal 10 d of the second high-voltage winding 10 b is connected to the upper terminal 34 of the test lightning arrester 3.

  With the above configuration, the first short-circuit generator 1, the first protective circuit breaker 4, the first input switch 5, the first reactor 30, the large current source transformer 6, and the like constitute the large current source circuit 7. ing. The second short-circuit generator 2, the second protective circuit breaker 8, the second input switch 9, the second reactor 31, the high voltage source transformer 10, and the like constitute a high voltage source circuit 11. .

  Both the first short-circuit generator 1 and the second short-circuit generator 2 are AC generators. The high voltage source voltage V2 generated at both ends of the second high voltage winding 10b is higher than the large current source voltage V1 generated at both ends of the first high voltage winding 6b.

  The signal detected by the high-voltage side current detector 13 is input to the sequencer device 14 and the timer device 15, and the switchgear and the circuit breaker are controlled by the output of the sequencer device 14.

  Next, the flow of the test sequence will be described with reference to FIG.

  First, the auxiliary current breaker 12 is opened on the large current source circuit 7 side so that the high voltage is not applied to the large current source circuit 7 even if a high voltage is applied to the test lightning arrester 3. Here, the setting of the high voltage source circuit 11 will be described. With the voltage-current characteristics of the lightning arrester shown in FIG. 3, a circuit current value is set to several tens of A when a voltage at which 1 mA flows to the element is applied from the high voltage source circuit 11 and a short circuit is established. This voltage TOV (high voltage source voltage V2) is continuously applied to the test lightning arrester 3, and after detecting that the element has become conductive, a large current is applied after a short time of about 1 second. The voltage application time of TOV was defined as IEC60099-4 Edi2-1 within 5 minutes ± 3 minutes.

  The voltage on the TOV side is set as described above, and after the second protective circuit breaker 8 and the second making switch 9 are turned on, the TOV voltage is raised. The large current source voltage V1 is substantially the same or is increased to a set value after 1 to 2 minutes. Here, although the current value from the TOV side circuit is set to several tens A, it may be several A, and is a test condition setting only for bringing the non-linear characteristics of the test lightning arrester 3 into an electrically conductive state. Unless the resin on the surface of the lightning arrester keeps its original shape, it cannot be said to be an initial state for verifying the pressure release performance against a large current.

  Next, after a few minutes after the TOV voltage V2 rises, the test lightning arrester element becomes conductive, and a TOV current 19 begins to flow. The TOV current 19 is detected by a high voltage side current detector 13 such as a current transformer (CT), and the output is converted into a contact signal by an OCR relay or the like. The device 8 is shut off about 0.2 seconds after the start of TOV application. At the same time, the sequencer device 14 is activated by the contact signal, and by setting the time of the sequencer device 14, the first auxiliary circuit breaker 12 is turned on and then the first making switch 5 is turned on to energize a large current. Thereafter, the auxiliary circuit breaker 12 interrupts the large current 18 after a specified time, and the pressure release test is completed.

  FIG. 4 shows a phenomenon waveform around 3 seconds in which a current flows in the pressure release test.

  As described above, in this embodiment, the specified lightning high current is applied to the lightning arrester in a finished product state without attaching a trigger fuse wire for forcibly energizing a large current inside the lightning arrester. Can be energized. Therefore, it is possible to carry out a pressure release test closer to the actual state at the full rated voltage of the lightning arrester. Further, since the two power sources of the large current source and the high voltage source can be set separately, the test circuit configuration is easy.

[Second Embodiment]
FIG. 5 is a circuit diagram showing a second embodiment of the lightning arrester discharge test apparatus according to the present invention. In the second embodiment, the pressure release test circuit is configured with one test power source, one test transformer for a large current source, and one for a high voltage source.

  That is, in the second embodiment, the portion of the large current source circuit 7 is the same as that of the first embodiment, but there is no second short-circuit generator, and the second low-voltage winding 10a of the high-voltage source transformer 10 is used. However, it is different from the first embodiment in that it is connected in parallel with the first low voltage winding 6a of the large current source transformer 6. Further, in the second embodiment, the reactor 20 and the second auxiliary circuit breaker 21 are disposed between the upper terminal 10d of the second high voltage winding 10b of the high voltage source transformer 10 and the upper terminal 34 of the test lightning arrester 3. Are connected in series. The rest is the same as the configuration of the first embodiment.

  The flow of the test sequence in the second embodiment is almost the same as that in the first embodiment.

  That is, first, the auxiliary circuit breaker 12 is opened on the side of the large current source circuit 7 so that the high voltage is not applied to the large current source circuit 7 even if a high voltage is applied to the lightning arrester 3. deep. Then, TOV (high voltage source voltage V2) is continuously applied to the test lightning arrester 3, and after detecting that the element is in a conducting state, a large current 18 is energized after a short time of about 1 second.

  Also in the second embodiment, similarly to the first embodiment, the trigger arrester wire for forcibly energizing a large current is not attached inside the test lightning arrester, and the lightning arrester in the finished product state is released. A large current can be applied, and the value of the current first peak value that is most desired to be secured by electromagnetic force can be 2.5 times or more of the effective current value.

  In the second embodiment, since there is one test power supply, it is almost impossible to change the excitation voltage of the power supply in a very short time after voltage application. Therefore, the test must be carried out with the excitation voltage of the power supply set to the TOV voltage of the high voltage source circuit 11. Therefore, the supply voltage of the large current 18 is set by the tap of the large current source transformer 6, and the current value of TOV is determined by the selection of the reactor value connected in series to the high voltage source circuit 11. Therefore, in order to perform tests on different types of rated voltages with the test lightning arrester 3, it is necessary to have test equipment that matches the test conditions in advance.

1 is a circuit diagram showing a first embodiment of a lightning arrester discharge test apparatus according to the present invention. The sequence flow figure in the lightning arrester discharge test apparatus of FIG. The graph which shows the typical voltage-current characteristic of a lightning arrester. The graph which shows the example of the voltage waveform of an actual test in the lightning arrester discharge | release test apparatus of FIG. The circuit diagram which shows 2nd Embodiment of the lightning arrester discharge test apparatus which concerns on this invention.

Explanation of symbols

1: Short-circuit generator (AC power supply), 2: Short-circuit generator (AC power supply), 3: Test lightning arrester, 4: Protection circuit breaker, 5: Switch-on switch, 6: High current source transformer, 6a: Low-voltage winding Wire, 6b: high voltage winding, 6c: lower terminal, 6d: upper terminal, 7: large current source circuit, 8: protective circuit breaker, 9: closing switch, 10: high voltage source transformer, 10a: low Voltage winding, 10b: High voltage winding, 10c: Lower side terminal, 10d: Upper side terminal, 11: High voltage source circuit, 12: Auxiliary circuit breaker, 13: High voltage side current detector (TOV current detector), 14 : Sequencer device, 15: Timer device, 18: Large current, 19: High voltage source current (TOV current), 20: Reactor, 21: Auxiliary circuit breaker, 30, 31: Reactor, 32: Large current side current detector, 33: Lower terminal, 34: Upper terminal, 35: Test lightning arrester connection line, V1: Large current Voltage, V2: high-voltage source voltage

Claims (8)

A high current source transformer comprising a first low voltage winding connected to a first AC power source and a first high voltage winding grounded at one end;
A high voltage source transformer comprising: a second low voltage winding connected to a second AC power source; and a second high voltage winding connected in parallel to the first high voltage winding;
First opening and closing means connected in series to the first low-voltage winding and the first AC power source;
Second opening / closing means connected in series to the second low-voltage winding and the second AC power source;
A test lightning arrester connection line for connecting a test lightning arrester in parallel to the first high-voltage winding and the second high-voltage winding;
A current detector for detecting a current flowing through the second high-voltage winding;
An auxiliary circuit breaker connected in series to the first high voltage winding;
A lightning arrester discharge test device characterized by comprising:   2. The lightning arrester discharge test according to claim 1, wherein at least one of the first opening / closing means and the second opening / closing means includes a protective circuit breaker and a closing switch connected in series to each other. apparatus.   When the first switching means and the auxiliary circuit breaker are in the open state, the second switching means is closed from the open state, a current is passed through the test arrester through the second high voltage winding, and after a predetermined time, the second The switching means is opened to stop the current from flowing through the test lightning arrester. Further, after a predetermined time, the auxiliary circuit breaker is closed, the first switching means is closed, A current is passed through the test lightning arrester through a high-voltage winding, and after a predetermined time, the auxiliary circuit breaker is opened, and the first switching means is further opened to stop the current from flowing through the test lightning arrester. The lightning arrester discharge test apparatus according to claim 1, further comprising a sequencer device that controls the lightning arrester. A high current source transformer comprising a first low voltage winding connected to an alternating current power source and a first high voltage winding grounded at one end;
A high voltage source transformer comprising a second low voltage winding connected in parallel to the first low voltage winding, and a second high voltage winding connected in parallel to the first high voltage winding And
First opening / closing means connected in series to the first low-voltage winding and the AC power source;
A test lightning arrester connection line for connecting a test lightning arrester in parallel to the first high-voltage winding and the second high-voltage winding;
A current detector for detecting a current flowing through the second high-voltage winding;
A first auxiliary circuit breaker connected in series with the first high voltage winding;
A second auxiliary circuit breaker connected in series with the second high voltage winding;
A reactor connected in series to the second high voltage winding and the second auxiliary circuit breaker;
A lightning arrester discharge test device characterized by comprising:   The lightning arrester discharge test apparatus according to claim 4, wherein the first switch means includes a protective circuit breaker and a closing switch connected in series with each other.   The first opening / closing means is closed, the first auxiliary circuit breaker is open, the second auxiliary circuit breaker is turned on, and a current is supplied to the test lightning arrester through the second high-voltage winding and a reactor. And after a predetermined time, the second auxiliary circuit breaker is opened to stop the current flow to the lightning arrester, and after a predetermined time, the first auxiliary circuit breaker is closed, A current is passed through the test lightning arrester through the first high-voltage winding, and after a predetermined time, the first auxiliary circuit breaker is opened, the first switching means is opened, and the current is supplied to the test lightning arrester. The lightning arrester discharge test device according to claim 4 or 5, further comprising a sequencer device that controls to stop the flow of water. A lightning arrester discharge test method using a lightning arrester discharge test device,
The lightning arrester discharge test device is:
A high current source transformer comprising a first low voltage winding connected to a first AC power source and a first high voltage winding grounded at one end;
A high voltage source transformer comprising: a second low voltage winding connected to a second AC power source; and a second high voltage winding connected in parallel to the first high voltage winding;
First opening and closing means connected in series to the first low-voltage winding and the first AC power source;
Second opening / closing means connected in series to the second low-voltage winding and the second AC power source;
A test lightning arrester connection line for connecting a test lightning arrester in parallel to the first high-voltage winding and the second high-voltage winding;
A current detector for detecting a current flowing through the second high-voltage winding;
An auxiliary circuit breaker connected in series to the first high voltage winding;
Have
The pressure release test method is as follows:
Closing the second opening / closing means from open when the first opening / closing means and the auxiliary circuit breaker are in an open state;
Passing a current through the second arrester through the second high voltage winding;
Then, after a predetermined time, opening the second opening and closing means to stop the current from flowing through the test lightning arrester;
Further, after a predetermined time, the auxiliary circuit breaker is closed, the first opening / closing means is further closed, and a current is passed through the test lightning arrester through the first high-voltage winding;
Then, after a predetermined time, opening the auxiliary circuit breaker, further opening the first opening and closing means, and stopping the current from flowing through the test arrester;
A lightning arrester discharge test method characterized by comprising: A lightning arrester discharge test method using a lightning arrester discharge test device,
The lightning arrester discharge test device is:
A high current source transformer comprising a first low voltage winding connected to an alternating current power source and a first high voltage winding grounded at one end;
A high voltage source transformer comprising a second low voltage winding connected in parallel to the first low voltage winding, and a second high voltage winding connected in parallel to the first high voltage winding And
First opening / closing means connected in series to the first low-voltage winding and the AC power source;
A test lightning arrester connection line for connecting a test lightning arrester in parallel to the first high-voltage winding and the second high-voltage winding;
A current detector for detecting a current flowing through the second high-voltage winding;
A first auxiliary circuit breaker connected in series with the first high voltage winding;
A second auxiliary circuit breaker connected in series with the second high voltage winding;
A reactor connected in series to the second high voltage winding and the second auxiliary circuit breaker;
Have
The pressure release test method is as follows:
The first opening / closing means is closed, the first auxiliary circuit breaker is open, the second auxiliary circuit breaker is turned on, and a current is supplied to the test lightning arrester through the second high-voltage winding and a reactor. Flowing the step,
Then, after a predetermined time, opening the second auxiliary circuit breaker to stop the current from flowing through the test arrester;
Further, after a predetermined time, the first auxiliary circuit breaker is closed, and a current is passed through the test arrester through the first high voltage winding;
Then, after a predetermined time, opening the first auxiliary circuit breaker, further opening the first opening and closing means, and stopping the current from flowing through the test arrester;
A lightning arrester discharge test method characterized by comprising:

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