JP2015220834A - Actual-load direction test apparatus for ground directional relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform operational check of a ground directional relay even when a phase modifier is installed.SOLUTION: The actual-load direction test apparatus includes an operation section 60 for selecting a directional test and a switching circuit 10 for connecting only a first phase 101A, only a second phase 101B, only a third phase 101C, or the first phase 101A and the second phase 101B, the third phase 101C and the first phase 101A, the second phase 101B and the third phase 101C, among secondary windings 101A, 101B, 101C of a current transformer, with a slide resistor 180 according to selection by the operation section 60.

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.

  For example, a ground fault direction relay is installed in a substation, etc., and when a transmission line accident occurs, the fault location is quickly separated, thereby preventing accidents from spreading to the system, disruption of supply, damage to power transmission equipment, etc. . In order for the protective relay to fully function, a PT circuit, a CT circuit, a cut-off signal, and the like must be securely connected. For this reason, when a protective relay is newly installed or replaced, or when a breaker is replaced, it is necessary to perform a confirmation test to confirm that the protective function operates reliably. And when performing a confirmation test, the confirmation work by the actual power flow of a power transmission line, that is, the confirmation work is performed in a state where power is actually transmitted.

  In order to perform such a confirmation test, conventionally, it has been necessary for an operator to connect each time to perform an actual load test, which may cause a human error. For this reason, an actual load direction test device for a ground fault direction relay that makes it possible to easily perform a test and to reduce the weight of the device is known (for example, see Patent Document 1). This device short-circuits the operation unit that switches the direction test for determining the power transmission side failure and the power reception side failure according to the position of the handle and each secondary winding of the current transformer, A switching unit that selects and connects each secondary winding of the current transformer to a resistor according to the position, and the switching unit is configured to operate each secondary of the current transformer when the handle of the operation unit is operated. After the winding is selected and connected to the resistor, the short-circuit state of the selected secondary winding is released.

JP 2008-172964 A

By the way, when phase-adjusting equipment (equipment for absorbing and generating reactive power and keeping voltage constant) such as a power capacitor (SC) and a shunt reactor (ShR) is provided, as shown in FIG. Further, the phase of the load current is shifted by 90 °. In the apparatus of Patent Document 1, since the zero-phase current I ₀ is simulated only on the power transmission side (R phase) and the power reception side (ST phase), the load current is connected to the ground fault direction relay ( 67G), and the operation of the ground fault direction relay cannot be confirmed.

  Accordingly, an object of the present invention is to provide an actual load direction test device for a ground fault direction relay capable of checking the operation of the ground fault direction relay even when a phase adjusting facility is provided. To do.

  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. An actual load direction test apparatus for a ground fault direction relay that performs a test using a secondary winding of the current transformer, and an operation unit that selects a direction test, and the change according to the selection by the operation unit. Only the first phase, the second phase only, the third phase only, or the first phase and the second phase, the third phase and the first phase, the second phase of the secondary winding of the flow device And a switching unit that connects the third phase and the third phase to a resistor.

  According to the present invention, when the direction test / phase is selected by the operation unit, only the first phase, only the second phase, only the third phase, or the first phase is selected by the switching unit according to the selection. The second phase, the third phase and the first phase, the second phase and the third phase are connected to the resistor.

  According to the first aspect of the present invention, since the secondary winding of the current transformer is connected to the resistor according to the selection by the operation unit, a zero-phase current is generated in the tertiary circuit of the current transformer, and a ground fault occurs. Directional relays can be tested. At this time, each phase of the secondary winding of the current transformer is individually connected to the resistor, or two phases are simultaneously connected to the resistor, and a zero-phase current is simulated and generated in all phases. be able to. For this reason, even if it is a case where the phase adjustment equipment is provided, the operation check of the ground fault direction relay with a reactive power load can be performed. In addition, since the phase can be changed simply by selecting the direction test / phase with the operation unit, the test of the ground fault direction relay can be performed easily and in a short time.

It is a schematic block diagram which shows the actual load direction test apparatus for ground fault direction relays at the time of CT primary circuit use in Embodiment 1 of this invention. It is a figure which shows the operation part of the apparatus of FIG. It is a figure which shows the changeover switch of the switching circuit of the apparatus of FIG. It is a figure which shows the kind of contact in the changeover switch of FIG. It is a figure which shows the state of "normal" with the changeover switch of FIG. It is a figure which shows the flow of the electric current in the state of FIG. It is a figure which shows the state of "R" with the changeover switch of FIG. It is a figure which shows the flow of the electric current in the state of FIG. It is a figure which shows the state of "S" with the changeover switch of FIG. FIG. 10 is a diagram showing a current flow in the state of FIG. 9. It is a figure which shows the state of "T" with the changeover switch of FIG. It is a figure which shows the flow of the electric current in the state of FIG. FIG. 13 is a diagram showing a current flow in a “normal” state following FIG. 12. It is a figure which shows the flow of an electric current in the state of "RS" with the changeover switch of FIG. It is a figure which shows the flow of an electric current in the state of "TR" with the changeover switch of FIG. It is a figure which shows the flow of an electric current in the state of "ST" with the changeover switch of FIG. It is a figure which shows the relationship between the zero phase electric current of the S phase and RS phase which were generated by the apparatus of FIG. 1 at the time of SC load, and the operating area of a ground fault direction relay. It is a schematic block diagram which shows the actual load direction test apparatus for ground fault direction relays at the time of CT secondary residual circuit use in Embodiment 2 of this invention. It is a schematic diagram showing the I ₀ generating method during actual load tests at 3 primary circuit using a diagram of the state of generating a simulated I ₀ to R-phase. It is a schematic diagram showing the I ₀ generating method during actual load tests at 3 primary circuit using a diagram of the state of generating a simulated I ₀ to S phase. When the tertiary circuit used during actual load test is a schematic diagram showing the I ₀ generation method, a diagram of the state of generating a simulated I ₀ to T phase. It is a schematic diagram showing the I ₀ generating method during actual load tests at 3 primary circuit using a diagram of the state of generating a simulated I ₀ in ST phase. It is a schematic diagram showing the I ₀ generating method during actual load tests at the secondary residual circuit using a diagram of the state of generating a simulated I ₀ to R-phase. It is a schematic diagram showing the I ₀ generating method during actual load tests at the secondary residual circuit using a diagram of the state of generating a simulated I ₀ to S phase. It is a schematic diagram showing the I ₀ generating method during actual load tests at the secondary residual circuit using a diagram of the state of generating a simulated I ₀ to T phase. Is a schematic diagram showing the I ₀ generating method during actual load test of the secondary residual circuit is used, it is the drawing condition for generating a simulated I ₀ in ST phase. It is a figure which shows the relationship between the zero phase current of the conventional R phase and ST phase in SC load, and the operating area of a ground fault direction relay.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing an actual load direction test apparatus for ground fault direction relay (hereinafter referred to as “actual load direction test apparatus”) 1 according to an embodiment of the present invention. In this embodiment, the third circuit 201 formed by connecting the third windings 201A, 201B, 201C of the current transformer has a ground fault occurrence and a ground fault using a zero phase voltage and a zero phase current. A protection device (ground fault direction relay) 140 for detecting the generation direction and a measuring device 150 for detecting a zero-phase current and its phase are connected. Then, by selecting the secondary windings 101A, 101B, and 101C of the current transformer and connecting them to the sliding resistor (resistor) 180, a zero-phase current generated at the time of failure is generated in the tertiary circuit 201, A direction test of the protective device 140 as shown in FIGS. 19 to 22 is performed.

The actual load direction test apparatus 1 mainly includes an operation unit 60 shown in FIG. 2, a switching circuit 10 serving as a switching unit, an R terminal 12A for a red phase (first phase) on the input side, a white phase (second phase). Phase S terminal 12B, blue phase (third phase) T terminal 12C, neutral phase N terminal 12D, ground terminal 12E, output red phase R terminal 13A, white phase S It has a terminal 13B, a T terminal 13C for blue phase, an N terminal 13D for neutral phase, a ± terminal 13E that is a measuring instrument connection terminal, and an I ₀ terminal 13F that is a terminal for zero phase current.

  The R terminal 12A is connected to an input terminal 14A of a CT secondary plug 30 to be described later via a connection line R11, and the R phase (first phase) is connected to the sliding resistor 180 by the switching circuit 10, It is possible to open the phase or switch the connection.

  The S terminal 12B is connected to an input terminal 14B of a CT secondary plug 20 described later via a connection line R12, and the S phase (second phase) is connected to the sliding resistor 180 by the switching circuit 10, It is possible to open the phase or switch the connection.

  The T terminal 12C is connected to the input terminal 14C of the CT secondary plug 30 via the connection line R13, and the switching circuit 10 connects the T phase (third phase) to the sliding resistor 180 or the phase loss. Or connection can be switched.

  The N terminal 12D is connected to the input terminal 14D of the CT secondary plug 30 via the connection line R14, and the switching circuit 10 can connect or switch the N phase (neutral phase) to another phase. It is possible.

  The E terminal 12E is connected to the N terminal 12D.

  The R terminal 13A can connect the output of the switching circuit 10 and the output terminal 15A of the CT secondary plug 30 via the connection line R21.

  The S terminal 13B can connect the output of the switching circuit 10 and the output terminal 15B of the CT secondary plug 20 via a connection line R22.

  The T terminal 13C can connect the output of the switching circuit 10 and the output terminal 15C of the CT secondary plug 30 via the connection line R23.

  The N terminal 13D can connect the output of the switching circuit 10 and the output terminal 15D of the CT secondary plug 30 via a connection line R24.

The ± terminal 13E is connected to the I ₀ terminal 13F via the connection line R25, and is short-circuited when used in the third CT use.

  The switching circuit 10 is connected to a sliding resistor 180 that adjusts the current when the operation of the protection device 140 is confirmed. With this switching circuit 10, the connection of the sliding resistor 180 to the secondary circuit 101 is switched so that one or two phases of the secondary circuit 101 are lost, and the phase of the zero-phase current generated in the tertiary circuit 201 is changed. Can be switched. Further, when the phase is switched, the secondary windings 101A to 101C of the secondary circuit 101 are prevented from being opened. Specific configuration and operation will be described later.

  The CT secondary plug 20 has an input terminal 14B and an output terminal 15B. The input terminal 14B is connected to the secondary winding 101B and the S terminal 12B via the connection line R12. The output terminal 15B is connected to the measuring device 120 and the S terminal 13B via the connection line R22.

  The CT secondary plug 30 has input terminals 14A, 14C, and 14D and output terminals 15A, 15C, and 15D. The input terminal 14A is connected to the secondary terminal 101A and the R terminal 12A via the connection line R11. The input terminal 14C is connected to the secondary terminal 101C and the T terminal 12C via the connection line R13. The input terminal 14D is connected to the N terminal 12D through the secondary winding 101 and the connection line R14. The output terminal 15A is connected to the measurement terminal 130 and the R terminal 13A via the connection line R21. The output terminal 15C is connected to the measuring device 130 and the T terminal 13C via the connection line R23. The output terminal 15D is connected to the N terminal 13D via the measuring device 130 and the connection line R24.

  The operation unit 60 selects a direction test (phase in which a zero-phase current is simulated), and is disposed on the surface of a housing that houses the switching circuit 10 and the like. As shown in FIG. It has. The switching handle 61 is operated by an operator who confirms the function of the protective device 140. The switching handle 61 rotates around the shaft 61a and rotates clockwise, “normal”, “R”, “S”, “ A temporary stop is made at positions (each direction test) indicated as “T”, “normal”, “RS”, “TR”, and “ST”. An instruction mark 62 is marked on the switching handle 61, and the direction test corresponding to the instruction mark 62 is the selected direction test / phase. Such a switching handle 61 is connected to the switching circuit 10.

  The switching circuit 10 short-circuits the secondary windings 101A, 101B, and 101C of the current transformer, and the red one of the secondary windings 101A, 101B, and 101C of the current transformer is selected according to the selection by the operation unit 60. Sliding resistor for phase 101A only, white phase 101B only, blue phase 101C only, red phase 101A and white phase 101B, blue phase 101C and red phase 101A, or white phase 101B and blue phase 101C 180 is a circuit connected to 180. The switching circuit 10 selects each secondary winding 101A, 101B, 101C of the current transformer and connects it to the sliding resistor 180, and then short-circuits the selected secondary winding 101A, 101B, 101C. Is to be canceled.

  Specifically, a changeover switch 10A as shown in FIG. 3 is provided, and this changeover switch 10A is rotated by operation of the changeover handle 61. That is, overlap contacts P1 to P33 are provided at the positions of “normal”, “RS”, “TR”, “ST”, “normal”, “R”, “S”, and “T”. , A control cam switch for controlling opening and closing between the terminals S11 and S12, between the terminals S21 and S22,..., Between the terminals S123 and S124. Here, the overlap contacts P1 to P33 are contacts that enable overlapping contact (overlapping contact), the contact C1 shown in FIG. 4 is a contact that is turned on at the notch position, and the contact C2 is also between the notches. The contact C3 is an ON contact, and the contact C3 is a lap contact in which the next contact is turned on before one of the contacts is cut between the notches.

  As shown in FIG. 5, when the switching handle 61 is in the “normal” position, the overlap contact P1 is turned on, and the terminals S11 and S12, that is, the R terminal 12A and the R terminal 13A are electrically connected. Connected to. Similarly, the overlap contact P17 is turned on to electrically connect the S terminal 12B and the S terminal 13B, and the overlap contact P6 is turned on to electrically connect the T terminal 12C and the T terminal 13C. The As a result, as shown in FIG. 6, current flows from the R terminal 12A, S terminal 12B, and T terminal 12C to the R terminal 13A, S terminal 13B, and T terminal 13C, respectively, and current flows to the sliding resistor 180. No state.

Next, as shown in FIG. 7, when the switching handle 61 is rotated clockwise and the switching handle 61 is at the “R” position, the overlap contact P4 is turned on and the terminals S11 and S12, that is, R The terminal 12A and the R terminal 13A are electrically connected, and the overlap contact P16 is turned on so that the R terminal 12A and the sliding resistor 180 are electrically connected. On the other hand, the overlap contact P26,29 and the S terminal 12B and T terminal 12C is on the N terminal 12D is connected to the (ground terminal 12E, _{I 0} pin 13F). As a result, as shown in FIG. 8, a current (red phase 101A) from the R terminal 12A flows through the R terminal 13A and the sliding resistor 180.

  Similarly, as shown in FIG. 9, when the switching handle 61 is in the “S” position, the overlap contact P21 is turned on and the S terminal 12B and the S terminal 13B are electrically connected, The lap contact P25 is turned on, and the S terminal 12B and the sliding resistor 180 are electrically connected. On the other hand, the overlap contacts P13, 30 are turned on, and the R terminal 12A and the T terminal 12C are connected to the N terminal 12D. As a result, as shown in FIG. 10, the current (white phase 101B) from the S terminal 12B flows through the S terminal 13B and the sliding resistor 180.

  Further, as shown in FIG. 11, when the switching handle 61 is in the “T” position, the overlap contact P10 is turned on, the T terminal 12C and the T terminal 13C are electrically connected, and the overlap The contact P33 is turned on, and the T terminal 12C and the sliding resistor 180 are electrically connected. On the other hand, the overlap contacts P12, 23 are turned on, and the R terminal 12A and the S terminal 12B are connected to the N terminal 12D. As a result, as shown in FIG. 12, the current (blue phase 101C) from the T terminal 12C flows through the T terminal 13C and the sliding resistor 180.

  Next, as shown in FIG. 13, when the switching handle 61 is in the “normal” position, the R terminal 12A, the S terminal 12B, and the T terminal 12C are the same as in the “normal” positions in FIGS. , Current flows through the R terminal 13A, S terminal 13B, and T terminal 13C, and no current flows through the sliding resistor 180.

  Next, when the switching handle 61 is at the position “R−S”, the overlap contacts P2 and P15 are turned on so that the R terminal 12A and the R terminal 13A are electrically connected, and the R terminal 12A and The sliding resistor 180 is electrically connected. Further, the overlap contacts P18 and P27 are turned on to electrically connect the S terminal 12B and the S terminal 13B, and the S terminal 12B and the sliding resistor 180 are electrically connected. On the other hand, the overlap contact P28 is turned on and the T terminal 12C is connected to the N terminal 12D. As a result, as shown in FIG. 14, the currents from the R terminal 12A and the S terminal 12B (red phase 101A and white phase 101B) flow to the R terminal 13A and the S terminal 13B and to the sliding resistor 180, respectively. become.

  Similarly, when the switching handle 61 is in the “TR” position, the overlap contacts P3 and P14 are turned on, and the R terminal 12A and the R terminal 13A are electrically connected, and the R terminal 12A and The sliding resistor 180 is electrically connected. In addition, the overlap contacts P7 and P31 are turned on to electrically connect the T terminal 12C and the T terminal 13C, and to electrically connect the T terminal 12C and the sliding resistor 180. On the other hand, the overlap contact P22 is turned on and the S terminal 12B is connected to the N terminal 12D. As a result, as shown in FIG. 15, currents from the R terminal 12A and the T terminal 12C (red phase 101A and blue phase 101C) flow to the R terminal 13A and the T terminal 13C, respectively, and to the sliding resistor 180. It becomes like this.

  When the switching handle 61 is at the “ST” position, the overlap contacts P19 and P24 are turned on to electrically connect the S terminal 12B and the S terminal 13B, and to slide the S terminal 12B and the S terminal 12B. The dynamic resistor 180 is electrically connected. Further, the overlap contacts P8 and P32 are turned on to electrically connect the T terminal 12C and the T terminal 13C, and to electrically connect the T terminal 12C and the sliding resistor 180. On the other hand, the overlap contact P11 is turned on and the R terminal 12A is connected to the N terminal 12D. As a result, as shown in FIG. 16, the currents from the S terminal 12B and the T terminal 12C (white phase 101B and blue phase 101C) flow to the S terminal 13B and the T terminal 13C and to the sliding resistor 180, respectively. become.

  Next, the test method and operation of the protection device 140 using the actual load direction test device 1 when the tertiary circuit is used will be described.

  First, in order to perform a direction test as a function check of the protective device 140, an operator uses the S terminal 12B via the CT secondary plug 20 and the R terminal 12A and the T terminal 12C via the CT secondary plug 30. The actual load direction test device 1 is connected to the secondary circuit 101 of the current transformer, the measuring device 120 is connected to the S terminal 13B via the CT secondary plug 20, and the R terminal 13A and T terminal are connected via the CT secondary plug 30. A measuring device 130 is connected to 13C. That is, the CT secondary plug 20 is connected to the measuring device 120, and the CT secondary plug 30 is connected to the measuring device 130.

Further, a protection device 140 is connected to the tertiary circuit, and a measuring instrument 150 is connected to the protection device 140. The ± terminal 13E and the I ₀ terminal 13F of the actual load direction test apparatus 1 are connected via the connection line R25 and used in a short-circuited state.

  In this state, when the direction handle is selected by turning the switching handle 61 of the operation unit 60, the switching circuit 10 connects the secondary windings 101A, 101B, and 101C to the sliding resistor 180 as described above. Is switched, one phase or two phases of the secondary circuit 101 are opened, and the phase of the zero-phase current generated in the tertiary circuit 201 is switched. That is, among the secondary windings 101A, 101B, and 101C, only the red phase 101A, only the white phase 101B, only the blue phase 101C, or the red phase 101A and the white phase 101B, or the blue phase 101C and the red phase 101A. Or the white phase 101B and the blue phase 101C are connected to the sliding resistor 180. Further, when the phase is switched, the secondary windings 101A, 101B, and 101C of the secondary circuit 101 are prevented from being opened.

  In this way, the actual load direction test apparatus 1 is used to perform a confirmation test of the zero-phase circuit when the tertiary circuit is used.

  As described above, according to the actual load direction test apparatus 1, the secondary windings 101A, 101B, and 101C of the current transformer are connected to the sliding resistor 180 according to the selection by the operation unit 60. A zero-phase current is generated in the tertiary circuit of the flow device, and the protection device 140 can be tested. At this time, each phase 101A, 101B, 101C of the secondary winding of the current transformer is individually connected to the sliding resistor 180, or two phases 101A, 101B, 101C are simultaneously connected to the sliding resistor 180. Thus, a zero-phase current can be simulated and generated in all phases (R phase, S phase, T phase, RS phase, TR phase, ST phase). For this reason, even if it is a case where phase adjusting equipment is provided, operation check of protection device 140 with a reactive power load can be performed. That is, for example, as shown in FIG. 17, the operation of the protection device 140 can be confirmed by simulating and generating a zero-phase current of the S phase or the RS phase within the operation region of the protection device 140 (67G). As a result, it is possible to perform a direction test of phase adjusting equipment such as a power capacitor and a shunt reactor.

  In addition, after selecting each secondary winding 101A, 101B, 101C of the current transformer in the switching circuit 10 and connecting it to the sliding resistor 180, the short circuit state of the selected secondary winding 101A, 101B, 101C is released. Therefore, it is possible to prevent the secondary windings 101A, 101B, and 101C from being opened when the phase loss state is changed, that is, when the phase of the zero-phase current is changed. Furthermore, since the secondary circuit 101 is in a passing state by setting the switching handle 61 to “normal” when the current transformer is connected, it is possible to safely connect even a circuit divided for each phase 101A, 101B, 101C. Can do.

  In addition, since the phase can be changed simply by selecting the direction test with the operation unit 60, the protection device 140 can be tested easily and in a short time. Furthermore, since the operation unit 60 and the switching circuit 10 are only one set, the actual load direction test apparatus 1 can be reduced in weight and size.

(Embodiment 2)
FIG. 18 shows a second embodiment of the present invention. In this embodiment, by selecting the secondary windings 103, 104, 105 of the three current transformers and connecting them to the protection device (ground fault direction relay) 160, a zero-phase current is given to the protection device 160, The protection device 160 using the secondary residual circuit as shown in FIGS. 23 to 26 is tested. Here, about the structure equivalent to Embodiment 1, the description is abbreviate | omitted by attaching | subjecting the same code | symbol or a corresponding code | symbol.

  In the actual load direction test apparatus 1, the input terminals 12A, 12B, 12C, and 12D and the output terminals 13A, 13B, 13C, and 13D are connected to connection lines R11, R12, R13, R14, R21, and R22, respectively. , R23, and R24 to be connected to the CT secondary plug 50.

  The CT secondary plug 50 has input terminals 14A, 14B, 14C, 14D and output terminals 15A, 15B, 15C, 15D. The input terminal 14A is connected to the R terminal 12A via the secondary winding 103 and the connection line R11. The input terminal 14B is connected to the S terminal 12B via the secondary winding 104 and the connection line R12. The input terminal 14C is connected to the T terminal 12C through the secondary winding 105 and the connection line R13. The input terminal 14D is connected to the N terminal 12D via the secondary winding 102 and the connection line R14. The output terminals 15A, 15B, 15C, and 15D are connected to the protection device 160 and the R terminal 13A, the S terminal 13B, the T terminal 13C, and the N terminal 13D through connection lines R21, R22, R23, and R24.

A protective device 160 is connected to the CT secondary plug 50. Further, the instrument 170 between ± terminals 13E and _{I 0} terminal 13F of the actual load direction test apparatus 1 is connected.

  In this state, when the direction handle is selected by turning the switching handle 61 of the operation unit 60, the protection device 160 for the secondary windings 103, 104, 105 of the secondary circuit 102 is switched by the switching circuit 10 as described above. Is switched, a one-phase or two-phase secondary current flows through the protection device 160, and the operation direction of the protection device 160 is switched. In this way, the actual load direction test apparatus 1 is used to perform a confirmation test of the zero phase circuit when the secondary residual circuit is used.

  As described above, according to the actual load direction test apparatus 1, whether the tertiary circuit is used (Embodiment 1) or the secondary residual circuit is used (Embodiment 2), The protection device 140 and the protection device 160 can be tested. In other words, the protection device can be tested by one actual load direction test apparatus 1 in any of the tertiary circuit and the secondary residual circuit. Since the test can be performed in any case with one actual load direction test apparatus 1, whether the tertiary circuit is used for the test object or the secondary residual circuit is used before the test. It is no longer necessary to check whether

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in Embodiment 1 described above, two CT secondary plugs 20 and 30 have been described. Of course, one CT secondary plug 50 may be used as in the second embodiment.

1 Actual load direction test equipment (actual load direction test equipment for ground fault relay)
10 Switching circuit (switching unit)
10A changeover switch 12A R terminal (input side R terminal for the first phase, input side R terminal for the red phase)
12B S terminal (input side S terminal for second phase, input side S terminal for white phase)
12C T terminal (input side T terminal for third phase, input side T terminal for blue phase)
12D N terminal (input side N terminal for fourth phase, input side N terminal for neutral phase)
13A R terminal (output side R terminal for first phase, output side R terminal for red phase)
13B S terminal (output side S terminal for second phase, output side S terminal for white phase)
13C T terminal (3rd phase output side T terminal, blue phase output side T terminal)
13D N terminal (output side N terminal for fourth phase, output side N terminal for neutral phase)
13E ± terminal (instrument connection terminal)
13F I ₀ terminal (zero-phase current terminal)
20 CT secondary plug 30 CT secondary plug 50 CT secondary plug 60 Operation unit 120 Measuring device 130 Measuring device 140 Protection device 150 Measuring device 160 Protection device 170 Measuring device 180 Sliding resistor (resistor)
101 Secondary circuit 201 Tertiary circuit 102 Secondary circuit

Claims (1)

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 for selecting a direction test;
According to the selection by the operation unit, only the first phase of the secondary winding of the current transformer, only the second phase, only the third phase, or the first phase and the second phase, A switching unit that connects the three phases and the first phase, the second phase and the third phase to the resistor,
An actual load direction testing device for a ground fault direction relay, comprising:

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