JP2008172964A - Actual load direction testing device for grounding directional relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actual load direction testing device for a grounding directional relay capable of facilitating a measurement and achieving weight reduction in the device. <P>SOLUTION: This actual load direction testing device for a grounding directional relay conducts a test on the grounding directional relay 110 to determine failure and failure direction due to a ground fault using a tertiary circuit 102 connecting the tertiary windings 102A to 102C of a current transformer through the use of the secondary windings 101A to 101C of the current transformer. It includes a switching handle 13 for switching a directional test for determining between a transmitting side failure and a receiving side failure depending upon the position of the handle and a switching section 14 for short-circuiting the secondary windings 101A to 101C of the current transformer and selecting the secondary windings 101A to 101C of the current transformer in response to the position of the switching handle 13 to connect them with a resistor 130. When the switching handle 13 is operated, the switching section 14 selects the secondary windings 101A to 101C of the current transformer to connect with the resistor 130, thereafter releasing the short-circuit of the selected secondary windings. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an actual load direction test apparatus for a ground fault direction relay used when confirming the function of a ground fault direction relay.

  The ground fault direction relay is installed in a substation, for example, and is used to detect a ground fault such as a transmission line. When a ground fault occurs in a transmission line, zero phase current and zero phase voltage are generated. The ground fault direction relay detects a ground fault in the transmission line based on the zero phase current and the zero phase voltage, and sends a cutoff signal to the circuit breaker to prevent the extension of the fault range. When confirming the function of such a ground fault direction relay, the confirmation work by the actual power flow of the transmission line, that is, the confirmation work is performed in a state where power is actually transmitted. The ground fault direction relay is used together with a current transformer. For detection of the zero-phase current and the zero-phase voltage, there are a case where a tertiary circuit using a tertiary winding of the current transformer is used and a case where three current transformers are used. The residual circuit used may be used.

As a function of the ground fault direction relay, there is a function to judge a failure that occurred on the customer side, that is, the power transmission side, and an accident that occurred on the power station side, that is, the power receiving side, but when conducting a direction test to investigate this function The operator needs to change the connection to the current transformer regardless of whether a tertiary circuit or a residual circuit is used. In other words, when detecting the zero-phase current and the zero-phase voltage using the tertiary circuit of the current transformer, one phase or two phases of the three-phase alternating current is lost in the secondary circuit of the current transformer, When the residual circuit is used, it is necessary to change the connection in order to open one phase or two phases of the three-phase AC in the residual circuit. In such a connection change, there is a tester for testing a ground fault direction relay while preventing erroneous connection (see, for example, Patent Document 1).
JP-A-7-35806

  By the way, the ground fault direction relay tester described above has the following problems. When this tester is used, the connection to the current transformer is changed by inserting / removing three plugs for phase loss for phase loss of one or two phases of the three-phase alternating current. Thus, since the conventional tester requires three open phase plugs, there is a problem that the apparatus becomes large and the apparatus becomes heavy. Moreover, since there are three open phase plugs, there is a possibility that the plugs may be inserted and removed by mistake. Further, when using the tertiary circuit of the current transformer when detecting the zero-phase current and the zero-phase voltage, since there are two secondary circuits and a tertiary circuit, the current transformer is used to change the connection. Drawings showing the connection state of the are indispensable.

  An object of the present invention is to provide an actual load direction test device for a ground fault direction relay that solves the above-mentioned problems, makes it possible to easily perform measurement, and enables the weight of the device to be reduced.

  In order to solve the above-mentioned problem, the invention of claim 1 is a ground fault direction relay that determines a fault occurrence due to a ground fault and a fault occurrence direction using a tertiary circuit in which a tertiary winding of a current transformer is connected. Is an actual load direction test device for a ground fault direction relay using the secondary winding of the current transformer, and a direction test for discriminating between a power transmission side failure and a power reception side failure The operation section to be switched depending on the position of the current transformer and each secondary winding of the current transformer are short-circuited, and each secondary winding of the current transformer is selected according to the position of the handle of the operation section to select a resistor. The switching unit connected to the resistor, and when the handle of the operation unit is operated, the switching unit is selected after selecting each secondary winding of the current transformer and connecting to the resistor. It is an actual load direction test device for ground fault direction relay, characterized by canceling the short-circuit state of the next winding

  In the first aspect of the invention, the ground fault direction relay determines a fault occurrence due to a ground fault and a fault occurrence direction using a tertiary circuit in which the tertiary winding of the current transformer is connected. In such a state, in order to perform the direction test of the ground fault direction relay, the operator operates the handle of the operation unit to switch between the power transmission side test and the power reception side test. On the other hand, the switching unit short-circuits each secondary winding of the current transformer, but when the handle of the operation unit is operated, each secondary winding of the current transformer is selected according to the position of the handle. And connect to the resistor. That is, one phase or two phases of the secondary circuit by the secondary winding are made open. At this time, the switching unit selects each secondary winding of the current transformer and connects it to the resistor, and then cancels the short-circuit state of the selected secondary winding.

  According to a second aspect of the present invention, there is provided a measuring device for measuring a zero-phase current generated in the tertiary circuit in accordance with a position of a handle of the operation unit in the actual load direction test device for a ground fault direction relay according to the first aspect. It is connected to the ground fault direction relay.

  The invention according to claim 3 is the actual load direction for the ground fault direction relay for performing the test of the ground fault direction relay for determining the occurrence of the fault due to the ground fault and the direction of the fault occurrence using the secondary windings of the three current transformers. A test device for switching a direction test for discriminating between a power transmission-side failure and a power-receiving-side failure according to a position of a handle; and a secondary winding of each of the current transformers in a short-circuit state; A switching unit that selects a secondary winding of each of the current transformers and connects to the ground fault direction relay according to the position of the handle of the unit, and the switching unit is operated by the handle of the operation unit. Then, after selecting the secondary winding of each current transformer and connecting it to the ground fault direction relay, the short circuit state of the selected secondary winding is released. It is a load direction test device.

  According to the invention of claim 3, the ground fault direction relay performs a test of the ground fault direction relay for determining the occurrence of the fault due to the ground fault and the fault occurrence direction using the secondary windings of the three current transformers. That is, in order to perform the test of the ground fault direction relay, the operator operates the handle of the operation unit to switch between the power transmission side test and the power reception side test. On the other hand, the switching unit short-circuits each secondary winding of the current transformer, but when the handle of the operation unit is operated, the secondary of each current transformer depends on the position of the handle of the operation unit. Select the winding and connect it to the ground fault relay. That is, one or two phases of the residual circuit formed by the secondary windings and the switching unit of the three current transformers are made open. At this time, the switching unit releases the short-circuit state of the selected secondary winding after selecting the secondary winding of each current transformer and connecting it to the ground fault direction relay.

  According to a fourth aspect of the present invention, in the actual load direction test device for a ground fault direction relay according to the third aspect, the switching unit is a zero-phase current generated in the tertiary circuit in accordance with the position of the handle of the operation unit. A measuring device for measuring the current is connected to the selected secondary winding.

  According to a fifth aspect of the present invention, in the actual load direction testing device for a ground fault direction relay according to any one of the first to fourth aspects, the switching unit selects a secondary winding of each of the current transformers. In order to cancel the short-circuit state of the secondary winding selected after being connected to the ground fault direction relay, an overlapping contact where the connection state and the release state overlap is used.

  According to the first aspect of the present invention, when switching the direction test between the power transmission side and the power reception side, the resistor is connected by selecting the secondary winding of the current transformer according to the position of the handle of the operation unit. A zero-phase current is generated in the tertiary circuit of the current transformer, and the ground fault direction relay can be tested. At this time, after selecting each secondary winding of the current transformer by the switching unit and connecting it to the resistor, the short circuit state of the selected secondary winding is released, so when changing the phase loss state, That is, it is possible to prevent the secondary windings from being opened when changing the phase of the zero-phase current. In addition, since the phase can be changed by operating the handle of the operation unit, the ground fault direction relay can be easily tested in a short time.

  According to invention of Claim 2 and Claim 4, the state of the zero phase current given to a ground fault direction relay can be measured.

  According to the invention of claim 3, when switching the direction test between the power transmission side and the power reception side, the secondary winding of each current transformer is selected according to the position of the handle of the operation unit, and the ground fault direction relay is selected. Because of the connection, the ground fault direction relay can be tested by the residual circuit of the current transformer. At this time, since the switching unit selects each secondary winding of the current transformer and connects it to the ground fault direction relay, the selected secondary winding is released from the short-circuit state. It is possible to prevent the secondary windings from being opened. In addition, since the phase can be changed by operating the handle of the operation unit, the ground fault direction relay can be easily tested in a short time.

  According to the invention of claim 5, since the overlapping contact is used for the switching portion, the configuration of the switching portion is simplified, and the weight of the device can be reduced as compared with the conventional case using three open phase plugs.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
In this embodiment, the ground fault direction relay is connected to the tertiary circuit formed by connecting the tertiary winding of the current transformer. Then, by selecting the secondary winding of the current transformer and connecting it to the resistor, a zero-phase current generated at the time of failure on the power transmission side or the power reception side is generated in the tertiary circuit, and the direction test of the ground fault direction relay I do. FIG. 1 shows an actual load direction test device for a ground fault direction relay according to this embodiment (hereinafter referred to as “actual load direction test device”). 1 includes a box-shaped storage case 11, and a terminal 12A (hereinafter referred to as “R terminal 12A”), “S” indicated on the operation panel 11A of the storage case 11, and “S”. Terminal 12B (hereinafter referred to as “S terminal 12B”), terminal 12C indicated as “T” (hereinafter referred to as “T terminal 12C”), terminal 12D indicated as “N” (hereinafter referred to as “T”). "N terminal 12D") and two terminals 12E and 12F indicated as "RE" (hereinafter referred to as "RE terminal 12E" and "RE terminal 12F"), and a switching handle on the operation panel 11A. 13 is provided.

  The connector 2 is connected to the R terminals 12A to 12D of the operation panel 11A. The connector 2 includes a cable 21 having one end connected to the R terminal 12A, S terminal 12B, T terminal 12C, and N terminal 12D, and a CTT plug (current test terminal) 22 connected to the other end of the cable 21. It has. As shown in FIG. 2, the CTT plug 22 is connected to a secondary circuit 101 of a current transformer installed in, for example, the R phase, S phase, and T phase of the bus of the substation. The secondary circuit 101 of the current transformer includes a secondary winding 101A of the current transformer provided on the R-phase side of the three-phase AC, a secondary winding 101B of the current transformer provided on the S-phase side, R terminal for R phase, S terminal for S phase, T terminal for T phase, and N terminal for neutral phase by connecting with secondary winding 101C of current transformer provided on T phase side I have. Then, the connecting device 2 includes the R terminal 12A for the red phase, the S terminal 12B for the white phase, the T terminal 12C for the blue phase, and the N terminal 12D for the neutral phase of the actual load direction test apparatus 1 as a secondary circuit. 101 is connected to the R terminal, S terminal, T terminal, and N terminal.

  The tertiary circuit 102 of the current transformer is formed by connecting the tertiary windings 102A to 102C, and is used for detecting the zero-phase current and the zero-phase voltage. The tertiary circuit 102 includes a ground fault direction relay 110 that detects a ground fault and a ground fault generation direction using a zero phase voltage and a zero phase current, and a measuring device 120 that detects a zero phase current and its phase. And are connected.

  A resistor 130 for adjusting the current when confirming the operation of the ground fault direction relay 110 is connected to the RE terminal 12E and the RE terminal 12F of the operation panel 11A (FIG. 2).

  The switching handle 13 is operated by an operator who confirms the function of the ground fault direction relay 110, rotates around the shaft 13A, and is at a position indicated as “power transmission”, “off” and It stops at the indicated position, the position indicated as “power reception”. Further, the switching handle 13 can be inserted / removed from a mounting hole provided in the operation panel 11 </ b> A at the “OFF” position. That is, the switching handle 13 can be removed from the operation panel 11A when the function confirmation work of the ground fault direction relay 110 is not performed. Such a switching handle 13 is connected to a switching portion 14 (FIG. 2).

  The switching unit 14 is stored in the storage case 11 and includes a switching switch 14A. The changeover switch 14 </ b> A is rotated by operating the changeover handle 13. Further, the changeover switch 14A includes overlap contacts P1 to P9 at the positions of “power transmission”, “off” and “power reception”, between the terminals S11 and S12 of the changeover switch 14A,..., Terminals S53 and S54. Is a control cam switch for controlling the opening and closing of the switch. The overlap contacts P1 to P9 are contacts (overlap contact) that enable overlapping contact. For example, as shown in FIG. 3A, when the switching handle 13 is in the “OFF” position, the overlap contact P1. Is turned on to electrically connect the terminal S11 and the terminal S12. Similarly, when the switching handle 13 is in the “OFF” position, the overlap contact P4 is turned on to electrically connect the terminals S21 and S22, and the overlap contact P6 is turned on. The terminals S31 and S32 are electrically connected. At this time, the overlap contact P2 is on, and the overlap contacts P3 and P5 are also off. The overlap contact P7 is off and does not electrically connect between the terminal S41 and the terminal S42. Similarly, the overlap contacts P8 and P9 are also off.

  In this state, when the switching handle 13 is changed from the “OFF” position to the “power transmission” position, the overlap contact P1 is turned OFF after the overlap contact P7 is turned ON, as shown in FIG. Become. That is, the overlap contact P7 is on only when the switching handle 13 is in the “power transmission” position, but the contact between the overlap contact P1 and the overlap contact P7 is overlapped between the terminals S11 and S12 and The connection between the terminal S41 and the terminal S42 is controlled. The overlap contacts P3 and P4 and the overlap contacts P5 and P6 are ON when the switching handle 13 is in the “OFF” position and the “power transmission” position.

  When the changeover switch 14A is moved from the “OFF” position to the “power receiving” position, the overlap contacts P4 and P6 are turned OFF after the overlap contacts P8 and P9 are turned ON. That is, the overlap contacts P8 and P9 are turned on when the switching handle 13 is in the "power receiving" position, but the terminals S21 and the terminal S21 are in contact with the overlap contacts P4 and P6 and the overlap contacts P8 and P9. The connection between S22, the connection between terminals S31 and S32, the connection between terminals S51 and S52, and the connection between terminals S53 and S54 are controlled. The overlap contacts P1 and P2 are ON when the switching handle 13 is in the “OFF” position and the “Power receiving” position.

  The changeover switch 14A and the terminals 12A to 12F are connected as shown in FIG. The R terminal 12A is connected to the terminals S11 and S41 of the changeover switch 14A. The S terminal 12B is connected to the terminals S21 and S51 of the changeover switch 14A. The T terminal 12C is connected to the terminals S31 and S53 of the changeover switch 14A. The N terminal 12D is connected to the RE terminal 12F, the terminal S12, the terminal S22, and the terminal S32 which are connection terminals of the resistor 130. The RE terminal 12E, which is a connection terminal of the resistor 130, is connected to the terminal S42, the terminal S52, and the terminal S54 of the changeover switch 14A.

  Next, the operation of this embodiment will be described. In order for an operator to perform a direction test as a function check of the ground fault direction relay 110, the actual load direction test device 1 is connected to the secondary circuit 101 of the current transformer using the connector 2, and the actual load direction test device 1. The resistor 130 is connected to. Thereafter, the operator inserts the switching handle 13 into the storage case 11. At this time, the switching handle 13 is in the “OFF” position, and as shown in FIG. 4, the secondary winding 101A of the secondary circuit 101 is short-circuited by the route R1. The route R1 is formed by passing through an R terminal 12A, a terminal S11, overlap contacts P1, P2, a terminal S12, a terminal S22, a terminal S32, and an N terminal 12D. Further, as shown in FIG. 5, the secondary winding 101B of the secondary circuit 101 is short-circuited by the route R2. The route R2 is formed through the S terminal 12B, the terminal S21, the overlap contacts P3 and P4, the terminal S22, the terminal S32, and the N terminal 12D. Similarly, as shown in FIG. 6, the secondary winding 101C of the secondary circuit 101 is short-circuited by the route R3. The route R3 is formed by a T terminal 12C, a terminal S31, overlap contacts P5 and P6, a terminal S32, and an N terminal 12D.

  Thus, when the switching handle 13 is in the off position, the secondary windings 101A to 101C of the secondary circuit 101 are all short-circuited, and no zero-phase current is generated in the tertiary circuit 102.

  For example, in order to perform a direction test of the ground fault direction relay 110 when a failure occurs on the power transmission side, that is, the customer side, the operator turns the switching handle 13 from the “OFF” position to the “Power transmission” position. Thereby, as shown in FIG. 7, after the overlap contact P7 is turned on, the overlap contact P1 is turned off. When the overlap contact P7 is turned on, the secondary winding 101A of the secondary circuit 101 is in a state where the resistor 130 is connected by the route R11. The route R11 is formed by passing through an R terminal 12A, a terminal S11, a terminal S41, an overlap contact P7, a terminal S42, one RE terminal 12E, a resistor 130, the other RE terminal 12F, and an N terminal 12D. When the switching handle 13 is changed from the “OFF” position to the “power transmission” position, the overlap contacts P3 and P4 are turned on as shown in FIG. When the overlap contacts P3 and P4 are turned on, the secondary winding 101B of the secondary circuit 101 is short-circuited by the route R12. The route R12 is formed through the S terminal 12B, the terminal S21, the overlap contacts P3 and P4, the terminal S22, the terminal S32, and the N terminal 12D. Further, when the switching handle 13 is changed from the “OFF” position to the “power transmission” position, the overlap contacts P5 and P6 are turned on as shown in FIG. When the overlap contacts P5 and P6 are turned on, the secondary winding 101C of the secondary circuit 101 is short-circuited by the route R13. The route R13 is formed through the T terminal 12C, the terminal S31, the overlap contacts P5 and P6, the terminal S32, and the N terminal 12D.

  As a result, even if the operator turns the switching handle 13 from the “OFF” position to the “power transmission” position, the secondary windings 101A to 101C of the secondary circuit 101 are not opened and the secondary circuit 101 A resistor 130 is connected to the secondary winding 101A for the R phase, and the secondary winding 101B for the S phase and the secondary winding 101C for the T phase of the secondary circuit 101 are kept short-circuited. That is, since one phase of the secondary circuit 101 is in an open phase state, a zero-phase current based on the R phase of the secondary circuit 101 is generated in the tertiary circuit 102. Since the zero-phase current is applied to the ground fault direction relay 110, the direction test of the ground fault direction relay 110 when a failure occurs on the power transmission side is enabled. Thereafter, even if the operator returns the switching handle 13 from the “power transmission” position to the “off” position, the secondary windings 101A to 101C of the secondary circuit 101 are opened by the overlap contacts P1, P3 to P7. It becomes a short circuit state without being done.

  When the operator turns the switching handle 13 from the “off” position to the “power receiving” position in order to perform the direction test of the ground fault direction relay 110 when a failure occurs on the power receiving side, that is, the power plant side, FIG. As shown, the overlap contacts P2, P1 are turned on. When the overlap contacts P2 and P1 are turned on, the secondary winding 101A of the secondary circuit 101 is short-circuited by the route R21. The route R21 is formed through the R terminal 12A, the terminal S11, the overlap contacts P2, P1, the terminal S12, the terminal S22, the terminal S32, and the N terminal 12D. Further, when the switching handle 13 is changed from the “OFF” position to the “power reception” position, as shown in FIG. 11, the overlap contact P4 is turned OFF after the overlap contact P8 is turned ON. When the overlap contact P8 is turned on, the secondary winding 101B of the secondary circuit 101 is connected to the resistor 130 through the route R22. The route R22 is formed by passing through the S terminal 12B, the terminal S21, the terminal S51, the overlap contact P8, the terminal S52, the terminal S42, one RE terminal 12E, the resistor 130, the other RE terminal 12F, and the N terminal 12D. The Similarly, when the switching handle 13 is moved from the “OFF” position to the “power receiving” position, the overlap contact P6 is turned off after the overlap contact P9 is turned on, as shown in FIG. When the overlap contact P9 is turned on, the secondary winding 101C of the secondary circuit 101 is in a state where the resistor 130 is connected by the route R23. Route R23 passes through T terminal 12C, terminal S31, terminal S53, overlap contact P9, terminal S54, terminal S52, terminal S42, one RE terminal 12E, resistor 130, the other RE terminal 12F, and N terminal 12D. It is formed by.

  As a result, even if the operator turns the switching handle 13 from the “OFF” position to the “power receiving” position, the secondary windings 101A to 101C of the secondary circuit 101 are not opened and the secondary circuit 101 The R-phase secondary winding 101A is kept short-circuited, and the resistor 130 is connected to the S-phase secondary winding 101B and the T-phase secondary winding 101C. That is, since the two phases of the secondary circuit 101 are in an open phase state, a zero phase current based on the S phase and the T phase of the secondary circuit 101 is generated in the tertiary circuit 102. A zero-phase current is then applied to the ground fault relay 110. Generally, the ground fault direction relay 110 operates only at one of the “power reception” and “power transmission” positions of the switching handle 13. Therefore, after the operation side test is performed, the test is performed to confirm the non-operation of the ground fault direction relay 110. That is, when the operation is confirmed on the “power transmission” side of the switching handle 13 (referred to as a normal operation), the non-operation confirmation is performed on the “power receiving” side of the switching handle 13 (referred to as a malfunction if operated). In this way, the direction test of the ground fault direction relay 110 is made possible. Thereafter, even if the operator returns the switching handle 13 from the “power receiving” position to the “off” position, the secondary winding of the secondary circuit 101 is caused by the overlap contacts P1, P2, P4, P6, P8, and P9. Lines 101A-101C are short-circuited without being opened.

  Thus, by operating the switching handle 13, the connection of the resistor 130 to the secondary circuit 101 is switched to make one phase or two phases of the secondary circuit 101 open, so that the zero-phase current generated in the tertiary circuit 102 is reduced. The phase can be switched. Further, since the overlapping contact is used for the changeover switch 14A of the changeover unit 14, the secondary windings 101A to 101C of the secondary circuit 101 are prevented from being opened when the phase is changed by operating the changeover handle 13. be able to. In addition, since the connection between the resistor 130 and the secondary circuit 101 is switched by the changeover switch 14A without using three open-phase plugs as in the prior art, the weight of the device can be reduced, and the changeover handle 13 can be reduced. Thus, the direction test can be performed with a simple operation, and the test operation of the ground fault direction relay 110 can be made more efficient.

(Embodiment 2)
In this embodiment, by selecting the secondary windings of the three current transformers and connecting them to the ground fault direction relay, a zero phase current generated at the time of failure on the power transmission side or the power receiving side is given to the ground fault direction relay, Test the ground fault direction relay using the residual circuit. An actual load direction test apparatus according to this embodiment is shown in FIG. In this embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. The actual load direction test apparatus 5 of FIG. 13 includes a box-shaped storage case 51, and an R-phase terminal 52A (hereinafter referred to as “± terminal 52A”) indicated by “±” on the operation panel 51A of the storage case 51. Terminal 52B (hereinafter referred to as “R terminal 52B”), an S phase terminal 52C (hereinafter referred to as “± terminal 52C”) and “S” indicated as “±”. Terminal 52D (hereinafter referred to as “S terminal 52D”), T phase terminal 52E (hereinafter referred to as “± terminal 52E”) and “T” indicated as “±”. A terminal 52F (hereinafter referred to as “T terminal 52F”), an N-phase terminal 52G indicated as “±” (hereinafter referred to as “± terminal 52G”), and a terminal 52H indicated as “N” (hereinafter referred to as “±”). "N terminal 52H") and "M for connecting the measuring device 120" ] Terminal 52J (hereinafter referred to as “M terminal 52J”) and terminal 52K (hereinafter referred to as “± terminal 52K”) indicated as “±”. Further, a switching handle 53 is provided on the operation panel 51A.

  The connection tool 6 is connected to the terminals 52A to 52H of the operation panel 51A. The connector 6 includes an R-phase ± terminal 52A and an R-terminal 52B, an S-phase ± terminal 52C and an S-terminal 52D, a T-phase ± terminal 52E and a T-terminal 52F, and an N-phase ± terminal. A cable 61 having one end connected to the 52G and the N terminal 52H and a CTT plug 62 connected to the other end of the cable 61 are provided. As shown in FIG. 14, the CTT plug 62 is connected to the secondary circuit 105 of three current transformers installed in, for example, the R phase, S phase, and T phase of the bus of the substation. The secondary circuit 105 is formed by connecting the secondary windings 106 to 108 of the current transformer, and includes an R terminal for the R phase, an S terminal for the S phase, a T terminal for the T phase, and It has an N terminal for neutral phase. The connection tool 6 connects the ± terminal 52A, ± terminal 52C, ± terminal 52E, and ± terminal 52G of the actual load direction test apparatus 5 to the R terminal, S terminal, T terminal, and N terminal of the secondary circuit 105. . And the connection tool 6 uses the R terminal 52B for the red phase, the S terminal 52D for the white phase, and the T terminal 52F for the blue phase of the actual load direction test apparatus 5 as one detection terminal of the ground fault direction relay 110. Connect the black-phase N terminal 52H of the actual load direction test apparatus 5 to the other detection terminal of the ground fault direction relay 110.

  The switching handle 53 is operated by an operator who confirms the function of the ground fault direction relay 110, rotates around the shaft 53A, and stops at the positions of “power transmission”, “off”, and “power reception”. . Since the switching handle 53 is the same as the switching handle 13 of the first embodiment, the description thereof is omitted.

  The switching unit 54 is stored in the storage case 51 and includes a switching switch 54A. The changeover switch 54A is rotated by operating the changeover handle 53. Further, the changeover switch 54A includes overlap contacts P21 to P32 at the positions of “transmission”, “off”, and “reception” of the changeover handle 53, between the terminals S11 and S12,..., Terminals S71 and S72. Is a control cam switch for controlling the opening and closing of the switch. The overlapping contacts P21 to P32 are overlapping contact contacts that enable overlapping contact and are the same as those in FIG.

  The changeover switch 54A and the terminals 52A to 52H, 52J, and 52K are connected as follows. The ± terminal 52A is connected to the terminals S11 and S51 of the changeover switch 54A, and the R terminal 52B is connected to the terminal S52 of the changeover switch 54A. The ± terminal 52C is connected to the terminals S21 and S61 of the changeover switch 54A, and the S terminal 52D is connected to the terminal S62 of the changeover switch 54A. The ± terminal 52E is connected to the terminals S31 and S63 of the changeover switch 54A, and the T terminal 52F is connected to the terminal S64 of the changeover switch 54A. The ± terminal 52G is connected to the terminal S41, the terminal S53, and the terminal S71 of the changeover switch 54A. The N terminal 52H is connected to the ± terminal 52K of the switching unit 54. The M terminal 52J of the switching unit 54 is connected to the terminal S12, the terminal S22, the terminal S32, the terminal S42, the terminal S54, and the terminal S72 of the changeover switch 54A.

  Next, the operation of this embodiment will be described. In order for an operator to perform a direction test as a function check of the ground fault direction relay 110, the actual load direction test device 5 is connected to the secondary circuit 105 of the current transformer by using the connector 6, and the actual load direction test device 5 is used. The measuring device 120 is connected to the M terminal 52J and the ± terminal 52K. Thereafter, the operator inserts the switching handle 53 into the storage case 51. At this time, the switching handle 53 is in the “OFF” position, and as shown in FIG. 15, the secondary winding 106 of the secondary circuit 105 is short-circuited by the route R51. Route R51 is formed by passing through ± terminal 52A, terminal S11, overlap contacts P21 and P22, terminal S12, terminal S22, terminal S32, terminal S42, overlap contact P27, terminal S41, and ± terminal 52G. When the switching handle 53 is in the “OFF” position, the secondary winding 107 of the secondary circuit 105 is short-circuited by the route R52 as shown in FIG. The route R52 is formed by passing through ± terminal 52C, terminal S21, overlap contacts P23 and P24, terminal S22, terminal S32, terminal S42, overlap contact P27, terminal S41, and ± terminal 52G. Further, when the switching handle 53 is in the “OFF” position, the secondary winding 108 of the secondary circuit 105 is short-circuited by the route R53 as shown in FIG. The route R53 is formed through the ± terminal 52E, the terminal S31, the overlap contacts P25 and P26, the terminal S32, the terminal S42, the overlap contact P27, the terminal S41, and the ± terminal 52G.

  As a result, when the switching handle 53 is in the “OFF” position, the secondary windings 106 to 108 of the secondary circuit 105 are all short-circuited, and the secondary windings 106 to 108 and the switching unit 54 No zero-phase current is generated in the formed residual circuit.

  For example, the operator turns the switching handle 53 from the “OFF” position to the “POWER TRANSFER” position in order to perform a direction test of the ground fault direction relay 110 when a failure occurs on the power transmission side, that is, the customer side. Thereby, as shown in FIG. 18, after the overlap contacts P28 and P29 are turned on, the overlap contacts P21 and P27 are turned off. When the overlap contacts P28 and P29 are turned on, the ground fault direction relay 110 and the measuring device 120 are connected to the secondary winding 106 of the secondary circuit 105 by the route R61. Route R61 includes ± terminal 52A, terminal S11, terminal S51, overlap contact P28, terminal S52, R terminal 52B, ground fault direction relay 110, N terminal 52H, ± terminal 52K, measuring device 120, M terminal 52J, and terminal S72. , Terminal S54, overlap contact P29, terminal S53, terminal S41, and ± terminal 52G. Further, when the switching handle 53 is moved from the “OFF” position to the “power transmission” position, as shown in FIG. 19, the overlap contact P27 is turned OFF after the overlap contact P29 is turned ON. When the overlap contacts P23, P24, P29 are turned on, the secondary winding 107 of the secondary circuit 105 is short-circuited by the route R62. Route R62 is formed by passing through ± terminal 52C, terminal S21, overlap contacts P23 and P24, terminal S22, terminal S32, terminal S42, terminal S54, overlap contact P29, terminal S53, terminal S41, and ± terminal 52G. The Further, when the switching handle 53 is changed from the “OFF” position to the “power transmission” position, the overlap contact P27 is turned OFF after the overlap contact P29 is turned ON, as shown in FIG. When the overlap contacts P25, P26, and P29 are turned on, the secondary winding 108 of the secondary circuit 105 is short-circuited by the route R63. Route R63 is formed by passing through ± terminal 52E, terminal S31, overlap contacts P25 and P26, terminal S32, terminal S42, terminal S54, overlap contact P29, terminal S53, terminal S41, and ± terminal 52G.

  As a result, when the switching handle 53 is changed from the “OFF” position to the “power transmission” position, the secondary windings 106 to 108 of the secondary circuit 105 are not opened, and the secondary winding 106 of the secondary circuit 105 is opened. Is connected to the ground fault direction relay 110 and the measuring device 120, and the secondary windings 107 and 108 of the secondary circuit 105 are short-circuited. That is, the secondary circuit 105 and the switching unit 54 apply one phase (red phase current) of the secondary circuit 105 to the ground fault direction relay 110, so that the ground fault direction relay 110 includes the secondary winding 106. The zero phase current is given. This enables a direction test of the ground fault direction relay 110 when a failure occurs on the power transmission side. Thereafter, even if the operator returns the switching handle 53 from the “power transmission” position to the “off” position, the secondary windings 106 to 108 of the secondary circuit 105 are opened by the overlap contacts P21 and P23 to P29. It becomes a short circuit state without being done.

  The operator turns the switching handle 53 from the “OFF” position to the “Power receiving” position in order to perform a direction test of the ground fault direction relay 110 when a failure occurs on the power receiving side, that is, the substation side. As a result, as shown in FIG. 21, the overlap contact P27 is turned off after the overlap contact P32 is turned on. When the overlap contacts P22 and P32 are turned on, the secondary winding 106 of the secondary circuit 105 is short-circuited by the route R71. Route R71 includes ± terminal 52A, terminal S11, overlap contacts P21, P22, terminal S12, terminal S22, terminal S32, terminal S42, terminal S54, terminal S72, overlap contact P32, terminal S71, terminal S53, terminal S41, Formed by passing through ± terminal 52G. Further, when the switching handle 53 is changed from the “OFF” position to the “power reception” position, as shown in FIG. 22, the overlap contacts P24 and P27 are turned OFF after the overlap contacts P30 and P32 are turned ON. . When the overlap contacts P30 and P32 are turned on, the ground fault direction relay 110 and the measuring device 120 are connected to the secondary winding 107 of the secondary circuit 105 by the route R72. Route R72 includes ± terminal 52C, terminal S21, terminal S61, overlap contact P30, terminal S62, S terminal 52D, ground fault direction relay 110, N terminal 52H, ± terminal 52K, measuring device 120, M terminal 52J, and terminal S72. , Overlap contact P32, terminal S71, terminal S53, terminal S41, and ± terminal 52G. Further, when the switching handle 53 is changed from the “OFF” position to the “power reception” position, as shown in FIG. 23, the overlap contacts P26 and P27 are turned OFF after the overlap contacts P31 and P32 are turned ON. . When the overlapping contacts P31 and P32 are turned on, the ground fault direction relay 110 and the measuring device 120 are connected to the secondary winding 108 of the secondary circuit 105 by the route R73. Route R73 includes ± terminal 52E, terminal S31, terminal S63, overlap contact P31, terminal S64, T terminal 52F, ground fault direction relay 110, N terminal 52H, ± terminal 52K, measuring device 120, M terminal 52J, and terminal S72. , Overlap contact P32, terminal S71, terminal S53, terminal S41, and ± terminal 52G.

  As a result, even if the operator turns the switching handle 53 from the “OFF” position to the “power receiving” position, the secondary windings 106 to 108 of the secondary circuit 105 are not opened and the secondary circuit 105 The secondary winding 107 and the secondary winding 108 are connected to the ground fault direction relay 110 and the measuring device 120, and the secondary winding 106 of the secondary circuit 105 is short-circuited. That is, by applying the two phases (white phase current and blue phase current) of the secondary circuit 105 to the ground fault direction relay 110, the ground fault direction relay 110 is based on the secondary winding 107 and the secondary winding 108. The zero phase current is given. Thereby, the direction test of the ground fault direction relay 110 is enabled. After this, even if the operator returns the switching handle 53 from the “power receiving” position to the “off” position, the overlap contacts P21, P22, P24, P26, P27, and P30 to P32 cause the secondary circuit 105 The next windings 106 to 108 are short-circuited without being opened.

  Thus, by operating the switching handle 53, the connection of the secondary windings 106 to 108 of the secondary circuit 105 to the ground fault direction relay 110 is switched, and a one-phase or two-phase secondary current is supplied to the ground fault direction relay circuit 110. The operation direction of the ground fault direction relay 110 can be switched. Further, since the overlapping contact is used for the changeover switch 54A of the changeover unit 54, the secondary windings 106 to 108 of the secondary circuit 105 are prevented from being opened when the changeover handle 53 is operated to switch the phase. be able to. Further, since the connection between the ground fault direction relay 110 and the secondary circuit 105 is switched by the changeover switch 54A without using three open-phase plugs as in the prior art, the weight of the device can be reduced, and the changeover handle can be reduced. The direction test can be performed by 53 simple operations, and the test work of the ground fault direction relay 110 can be made efficient.

(Embodiment 3)
FIG. 24 shows an actual load direction test apparatus according to this embodiment. The actual load direction test apparatus 8 shown in FIG. 24 is one in which the actual load direction test apparatus 1 according to the first embodiment and the actual load direction test apparatus 5 according to the second embodiment are stored in a storage case 81. On the operation panel 81A of the storage case 81, the operation panel 11A of the actual load direction test apparatus 1 and the operation panel 51A of the actual load direction test apparatus 5 are arranged side by side. The storage case 81 is connected to the R terminal 12A to RE terminal 12F and connected to the switching unit 14 including the changeover switch 14A, and the ± terminals 52A to N terminals 52H, the M terminal 52J, and the ± terminals 52K. And a switching unit 54 including a changeover switch 54A.

  The switching handle 13 of the operation panel 11A is also used as a switching handle of the operation panel 51A. That is, the changeover handle 13 is attached to the attachment hole 13B of the operation panel 11A for the operation of the changeover switch 14A, and is attached to the attachment hole 53B of the operation panel 51A for the operation of the changeover switch 54A.

  Thus, according to this embodiment, two types of tests can be performed with one apparatus. Further, since the operator uses one switching handle 13 for the actual load direction test apparatus 8, the switching unit 14 and the switching unit 54 are operated by the single switching handle 13, and erroneous operation can be prevented.

It is a figure which shows the external appearance of the actual load direction test apparatus by Embodiment 1 of this invention, Fig.1 (a) is a front view, FIG.1 (b) is a top view. It is a figure which shows the structure of FIG. FIG. 3A is a diagram illustrating a case where the switching handle is in the “OFF” position, and FIG. 3B is a diagram illustrating a case where the switching handle is in the “power transmission” position. FIG. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the external appearance of the actual load direction test apparatus by Embodiment 2 of this invention, Fig.13 (a) is a front view, FIG.13 (b) is a top view. It is a figure which shows the structure of FIG. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a figure which shows the route | root formed with a changeover switch. It is a top view which shows the actual load direction test apparatus by Embodiment 3 of this invention.

Explanation of symbols

1, 5 Actual load direction test device 11, 51 Storage case 11A, 51A Operation panel (operation unit)
13, 53 Switching handle (operation unit)
13A, 53A shaft (operation unit)
13B, 53B Mounting hole 14, 54 Switching portion 14A, 54A Changeover switch P1-P9, P21-P32 Overlap contact 2 Connector 21 Cable 22 CTT plug 6 Connector 61 Cable 62 CTT plug 8 Actual load direction test device 81 Storage case 81A Operation panel 101 Secondary circuit 101A to 101C Secondary winding 102 Tertiary circuit 102A to 102C Tertiary winding 105 Secondary circuit 106 to 108 Secondary winding 110 Ground fault direction relay 120 Measuring device 130 Resistor

Claims (5)

A test of a ground fault direction relay that determines the occurrence of a fault due to a ground fault and the direction of the fault occurrence using a tertiary circuit in which the tertiary winding of the current transformer is connected is performed using the secondary winding of the current transformer. An actual load direction test device for a ground fault direction relay,
An operation unit that switches a direction test for discriminating between a power transmission side failure and a power reception side failure according to the position of the handle;
A switching unit that short-circuits each secondary winding of the current transformer and selects and connects each secondary winding of the current transformer to a resistor according to the position of the handle of the operation unit; ,
When the handle of the operation unit is operated, the switching unit selects each secondary winding of the current transformer and releases the short-circuit state of the selected secondary winding after connecting to the resistor. An actual load direction test device for a ground fault direction relay, characterized in that.   2. The ground fault direction relay according to claim 1, wherein a measuring device for measuring a zero-phase current generated in the tertiary circuit according to a position of a handle of the operation unit is connected to the ground fault direction relay. Load direction test equipment. An actual load direction test device for a ground fault direction relay, which performs a test of a ground fault direction relay using a secondary winding of three current transformers to determine a fault occurrence and a fault occurrence direction due to a ground fault,
An operation unit that switches a direction test for discriminating between a power transmission side failure and a power reception side failure according to the position of the handle;
A switching unit that short-circuits the secondary windings of each of the current transformers and selects the secondary winding of each of the current transformers according to the position of the handle of the operation unit and connects to the ground fault direction relay. And
When the handle of the operation unit is operated, the switching unit selects a secondary winding of each of the current transformers and connects a short circuit state of the selected secondary winding after connecting to the ground fault direction relay. An actual load direction testing device for a ground fault direction relay, which is released.   The said switching part connects the measuring apparatus which measures the zero phase electric current which generate | occur | produces in the said tertiary circuit according to the position of the handle | steering-wheel of the said operation part to the selected secondary winding. Load direction test device for ground fault direction relays.   The switching unit selects a secondary winding of each current transformer and connects it to the ground fault direction relay, and then cancels the short-circuit state of the selected secondary winding. The actual load direction testing device for a ground fault direction relay according to any one of claims 1 to 4, wherein overlapping overlapping contacts are used.

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