A detection device for FTU feeder terminal

Abstract

The present invention discloses a detection device for an FTU feeder terminal, including a housing. A power socket and an aviation socket are provided on the housing. The aviation socket has a plurality of connection terminals. A relay control circuit is provided inside the housing. The relay control circuit includes a spring-operated energy storage circuit, a spring-operated closing circuit, a spring-operated opening circuit, a permanent magnet type opening and closing circuit, and a zero-sequence voltage output circuit. Between the live wire terminal L and the neutral wire terminal N of the power socket, an indicating circuit, a delay circuit, and an isolation control circuit are connected in parallel with each other. The present invention can simulate signals such as opening, closing, and energy storage of the switch supporting equipment through the relay control circuit, can meet the detection requirements of permanent magnet type and spring-operated type FTU feeder terminals, and simulates the output of zero-sequence voltage through an internal low-voltage transformer. Moreover, the present invention also has the advantages of small volume, simple operation, low price, and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of FTU feeder terminal detection. More specifically, the present invention is a detection device for FTU feeder terminals. Background Art

[0002] An FTU feeder terminal is a distribution controller used in conjunction with a pole-mounted circuit breaker. It has functions such as remote signaling, remote measurement, and remote control for the distribution network, communicates with the substation, provides various operating parameters of the power system, and monitors information, including circuit breaker status, electrical energy parameters, zero-sequence faults, overcurrent faults, instantaneous trip and other fault parameters. It can execute operation commands issued by the substation, control the power on and off of the distribution circuit breaker, and achieve functions such as fault isolation, fast power supply, and fault locking.

[0003] When detecting an FTU feeder terminal, at present, most FTU feeder terminals in the industry adopt a joint debugging and detection method with switches (circuit breakers) in the actual line. A large current generator and the main circuit are used to simulate the large current on the primary side of the high-voltage line. The FTU feeder terminal executes the switch opening and closing operation commands, and the FTU feeder terminal detection work is carried out through the switch opening and closing actions and current simulation. Although this detection method can better detect the operating state of the FTU feeder terminal in a real environment, it needs to be jointly debugged with the switch body. Different types of FTU feeder terminals require different types of switches for matching detection (for example, a spring-operated FTU feeder terminal needs to be connected to a spring-operated circuit breaker, and a permanent magnet type FTU feeder terminal needs to be connected to a permanent magnet type circuit breaker). A large number of detection devices such as large current generators, switches, withstand voltage testers and other detection equipment are required during the detection process, and the detection environment requirements are high, the operation is complex, and the input cost is high.

[0004] Therefore, how to configure a general detection device to detect different types of FTU feeder terminals and simulate the opening, closing, and energy storage states of switch equipment has become a technical problem that needs to be solved urgently by those skilled in the art and the focus of continuous research. Summary of the Invention

[0005] To solve the technical problem that the existing FTU feeder terminal needs to be jointly debugged with real switch equipment during detection, the present invention innovatively provides a detection device for FTU feeder terminals. From the perspective of simulation testing, relay control circuits are used to simulate signals such as opening, closing, and energy storage of switch supporting equipment, which can meet the detection requirements of permanent magnet type and spring-operated FTU feeder terminals. The output of zero-sequence voltage is simulated by an internal low-voltage transformer. Moreover, the present invention also has the advantages of small volume, simple operation, low price, and high reliability.

[0006] To achieve the above technical objectives, an embodiment of the present invention discloses a detection device for an FTU feeder terminal, including a housing, on which a power socket and an aviation socket are provided. The aviation socket has a plurality of connection terminals. A relay control circuit is provided inside the housing, and the relay control circuit includes a change-over switch SA, a rectifier, a self-locking relay module RM, a first relay KA1, a second relay KA2, a third relay KA3, a fourth relay KA4, an eighth relay KA8, a tenth relay KA10, an eleventh relay KA11, a first time relay KT1, and a second transformer TM2.

[0007] Both ends of the coil of the second relay KA2 are correspondingly connected to the energy storage positive terminal and the energy storage negative terminal of the aviation socket to form a spring-operated energy storage loop.

[0008] The AC end of the rectifier is correspondingly connected to the live wire end L and the neutral wire end N of the power socket. The positive and negative poles of the self-locking relay are correspondingly connected to the positive and negative poles of the DC end of the rectifier. The first normally closed contact SA-1 of the change-over switch SA, the normally open contact of the self-locking relay module RM, the normally open contact of the first time relay KT1, the coil of the third relay KA3, and the second normally closed contact SA-2 of the change-over switch SA are sequentially connected in series between the closing positive terminal and the closing negative terminal of the aviation socket to form a spring-operated closing loop.

[0009] Both ends of the coil of the fourth relay KA4 are correspondingly connected to the opening positive terminal and the opening negative terminal of the aviation socket to form a spring-operated opening loop.

[0010] The first normally open contact SA-3 of the change-over switch SA, the coil of the tenth relay KA10, and the second normally open contact SA-4 of the change-over switch SA are sequentially connected in series between the closing positive terminal and the closing negative terminal of the aviation socket. Both ends of the coil of the tenth relay KA10 are connected in parallel with the normally open contact of the self-locking relay module RM and the coil of the eleventh relay KA11 connected in series in sequence. The negative pole of the DC end of the rectifier is connected to one end of the coil of the tenth relay KA10 through the normally open contact of the eighth relay KA8. The other end of the coil of the tenth relay KA10 is connected to the positive pole of the DC end of the rectifier to form a permanent magnet type closing and opening loop.

[0011] Both ends of the primary coil of the second transformer TM2 are correspondingly connected to the neutral wire end N and the live wire end L of the power socket. One end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage positive terminal of the aviation socket through a zero-sequence voltage switch SB2. The other end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage negative terminal of the aviation socket to form a zero-sequence voltage output loop.

[0012] Between the live wire terminal L and the neutral wire terminal N of the power socket, there are branches L1 - L7 connected in parallel with each other; the L1 branch includes the normally open contact of the first relay KA1 and the energy storage indicator light HL1 connected in series in sequence; the L2 branch includes the normally open contact of the self - locking relay module RM and the permanent magnet closing indicator light HL2 connected in series in sequence; the L3 branch includes the normally open contact of the first time relay KT1 and the coil of the first relay KA1 connected in series in sequence; the L4 branch includes the normally open contact of the third relay KA3, the normally closed contact of the fourth relay KA4 and the closing indicator light HL3 connected in series in sequence; the L5 branch includes the normally open contact of the fourth relay KA4, the normally closed contact of the third relay KA3 and the opening indicator light HL4 connected in series in sequence; the L6 branch includes the normally open contact of the second relay KA2 and the coil of the first time relay KT1 connected in series in sequence; the L7 branch includes the remote signaling disconnecting switch SB1 and the coil of the eighth relay KA8 connected in series in sequence.

[0013] Further, in a detection device for an FTU feeder terminal according to the present invention, the L4 branch further includes the coil of the fifth relay KA5 and the normally open contact of the fifth relay KA5. The coil of the fifth relay KA5 is connected in parallel with the closing indicator light HL3, and the normally open contact of the fifth relay KA5 is connected in parallel with the normally open contact of the third relay KA3.

[0014] Further, in a detection device for an FTU feeder terminal according to the present invention, the L4 branch further includes the coil of the second time relay KT2. The coil of the second time relay KT2 is connected in parallel with the closing indicator light HL3; the L6 branch further includes the normally closed contact of the fifth relay KA5 and the normally open contact of the second time relay KT2. The normally closed contact of the fifth relay KA5 is connected in series between the live wire terminal L of the power socket and the normally open contact of the second relay KA2, and the normally open contact of the second time relay KT2 is connected in parallel with the normally closed contact of the fifth relay KA5 and the normally open contact of the second relay KA2.

[0015] Further, in a detection device for an FTU feeder terminal according to the present invention, the L5 branch further includes the coil of the sixth relay KA6 and the normally open contact of the sixth relay KA6. The coil of the sixth relay KA6 is connected in parallel with the opening indicator light HL4, and the normally open contact of the sixth relay KA6 is connected in parallel with the normally open contact of the fourth relay KA4.

[0016] Further, in a detection device for an FTU feeder terminal according to the present invention, the relay control circuit further includes a voltage regulator TC and a first transformer TM1. The two ends of the primary coil of the voltage regulator TC are respectively connected to the neutral line terminal N and the live line terminal L of the power socket. The two ends of the secondary coil of the voltage regulator TC are correspondingly connected to the primary coil of the first transformer TM1. One end of the secondary coil of the first transformer TM1 is connected to the first common terminal of the aviation socket. The other end of the secondary coil of the first transformer TM1 is sequentially connected with a current transformer, a fuse, a normally open contact of a self-locking relay module RM, and a current output switching switch in series. The current output switching switch includes a plurality of knob switches connected in parallel with each other. Each knob switch is correspondingly connected to each current terminal of the aviation socket to form a current output loop.

[0017] Further, in a detection device for an FTU feeder terminal according to the present invention, the L7 branch further includes a coil of a ninth relay KA9. The coil of the ninth relay KA9 is connected in parallel with the coil of the eighth relay KA8. The current output loop further includes a normally closed contact of the ninth relay KA9 and a normally open contact of the fifth relay KA5. The normally closed contact of the ninth relay KA9 is connected in parallel with the normally open contact of the fifth relay KA5. The normally open contact of the fifth relay KA5 is connected in series between the fuse and the normally open contact of the self-locking relay module RM.

[0018] Further, in a detection device for an FTU feeder terminal according to the present invention, the normally open contact of the first relay KA1 is connected in series between the second common terminal and the energy storage terminal of the aviation socket to form an energy storage tele-signaling loop.

[0019] Further, in a detection device for an FTU feeder terminal according to the present invention, the normally open contact of the fifth relay KA5, the normally open contact of the eighth relay KA8, and the normally open contact of the self-locking relay module RM are sequentially connected in series between the second common terminal and the closing end of the aviation socket. And there is also a normally closed contact of the eighth relay KA8 connected between the second common terminal and the connection point of the normally open contact of the eighth relay KA8 and the normally open contact of the self-locking relay module RM to form a closing tele-signaling loop.

[0020] Further, in a detection device for an FTU feeder terminal according to the present invention, the normally open contact of the sixth relay KA6, the normally open contact of the eighth relay KA8, and the normally closed contact of the self-locking relay module RM are sequentially connected in series between the second common terminal and the opening end of the aviation socket. And there is also a normally closed contact of the eighth relay KA8 connected between the second common terminal and the connection point of the normally open contact of the eighth relay KA8 and the normally closed contact of the self-locking relay module RM to form an opening tele-signaling loop.

[0021] Further, for a detection device for an FTU feeder terminal according to the present invention, the relay control circuit further includes an ammeter A, and two ends of the ammeter A are correspondingly connected to the live wire terminal L and the neutral wire terminal N of the power socket.

[0022] The beneficial effects of the present invention are as follows: 200V power supply is provided through the power socket, connected to the FTU feeder terminal through the aviation socket, the relay control circuit is used to simulate and form a spring-operated closing loop, a spring-operated opening loop, a spring-operated energy storage loop, a permanent magnet type closing and opening loop, and a zero-sequence voltage output loop, the transfer switch is used to switch between the spring-operated and permanent magnet type FTU feeder terminals, the spring-operated energy storage indication is formed through the L1 branch, the permanent magnet type closing indication is formed through the L2 branch, the spring-operated closing indication is formed through the L4 branch, the spring-operated opening indication is formed through the L5 branch, the output of the zero-sequence voltage is simulated through the built-in second transformer, the relay control circuit receives the control signal of the FTU feeder terminal and generates corresponding actions, and at the same time, whether the function of the FTU feeder terminal is normal is detected by observing the prompts of the indicator lights. Description of the Drawings

[0023] Figure 1 It is a schematic connection structure diagram of the relay control circuit of a detection device for an FTU feeder terminal according to the present invention. Detailed Embodiments

[0024] The following will explain and illustrate in detail a detection device for an FTU feeder terminal according to the present invention with reference to the accompanying drawings of the specification.

[0025] As Figure 1 shown, an embodiment of the present invention discloses a detection device for an FTU feeder terminal, which specifically includes a housing, a power socket and an aviation socket are provided on the housing, the aviation socket has a plurality of connection ends, a relay control circuit is provided inside the housing, and the relay control circuit includes a transfer switch SA, a rectifier, a self-locking relay module RM, a first relay KA1, a second relay KA2, a third relay KA3, a fourth relay KA4, an eighth relay KA8, a tenth relay KA10, an eleventh relay KA11, a first time relay KT1 and a second transformer TM2.

[0026] Two ends of the coil of the second relay KA2 are correspondingly connected to the energy storage positive terminal and the energy storage negative terminal of the aviation socket to form a spring-operated energy storage loop;

[0027] The AC terminal of the rectifier is correspondingly connected to the live wire terminal L and the neutral wire terminal N of the power socket. The positive and negative poles of the self-locking relay are correspondingly connected to the positive and negative poles of the DC terminal of the rectifier. The first normally closed contact SA-1 of the change-over switch SA, the normally open contact of the self-locking relay module RM (Relay Modules), the normally open contact of the first time relay KT1, the coil of the third relay KA3, and the second normally closed contact SA-2 of the change-over switch SA are successively connected in series between the closing positive terminal and the closing negative terminal of the aviation socket to form a spring-operated closing loop;

[0028] The two ends of the coil of the fourth relay KA4 are correspondingly connected to the opening positive terminal and the opening negative terminal of the aviation socket to form a spring-operated opening loop;

[0029] The first normally open contact SA-3 of the change-over switch SA, the coil of the tenth relay KA10, and the second normally open contact SA-4 of the change-over switch SA are successively connected in series between the closing positive terminal and the closing negative terminal of the aviation socket. The two ends of the coil of the tenth relay KA10 are shunted with the normally open contact of the self-locking relay module RM and the coil of the eleventh relay KA11 connected in series successively. The negative pole of the DC terminal of the rectifier is connected to one end of the coil of the tenth relay KA10 through the normally open contact of the eighth relay KA8, and the other end of the coil of the tenth relay KA10 is connected to the positive pole of the DC terminal of the rectifier to form a permanent magnet type closing and opening loop;

[0030] The two ends of the primary coil of the second transformer TM2 are correspondingly connected to the neutral wire terminal N and the live wire terminal L of the power socket. One end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage positive terminal of the aviation socket through the zero-sequence voltage switch SB2, and the other end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage negative terminal of the aviation socket to form a zero-sequence voltage output loop;

[0031] Between the live wire terminal L and the neutral wire terminal N of the power socket, there are branches L1-L7 connected in parallel with each other; Branch L1 includes the normally open contact of the first relay KA1 and the energy storage indicator light HL1 connected in series successively; Branch L2 includes the normally open contact of the self-locking relay module RM and the permanent magnet closing indicator light HL2 connected in series successively; Branch L3 includes the normally open contact of the first time relay KT1 and the coil of the first relay KA1 connected in series successively; Branch L4 includes the normally open contact of the third relay KA3, the normally closed contact of the fourth relay KA4, and the closing indicator light HL3 connected in series successively; Branch L5 includes the normally open contact of the fourth relay KA4, the normally closed contact of the third relay KA3, and the opening indicator light HL4 connected in series successively; Branch L6 includes the normally open contact of the second relay KA2 and the coil of the first time relay KT1 connected in series successively; Branch L7 includes the telemetry isolating switch SB1 and the coil of the eighth relay KA8 connected in series successively.

[0032] In actual use, the power socket is connected to the 220V power supply, and the aviation socket is correspondingly connected to the FTU feeder terminal; the zero-sequence voltage switch SB2 is closed, and a 3V zero-sequence voltage is output through the second transformer TM2 to simulate the secondary voltage value output by the zero-sequence current transformer of the circuit breaker for detecting the zero-sequence telemetry value of the FTU feeder terminal. When detecting the spring-operated FTU feeder terminal, the change-over switch SA is in the spring-operated position, and at this time, the first normally closed contact SA-1 and the second normally closed contact SA-2 of the change-over switch SA are in the closed state. When performing the closing detection, the signal isolation switch SB1 is closed, and the FTU feeder terminal sends a energy storage signal to the positive pole and negative pole of the energy storage end of the aviation socket, and sends a closing signal to the positive pole and negative pole of the closing of the aviation socket. When the relay control circuit receives the energy storage signal, the coil of the second relay KA2 connected to the positive and negative energy storage terminals of the aviation socket is energized, and the normally open contact of the second relay KA2 in the L6 branch is closed, so that the coil of the first time relay KT1 is energized. When the time relay KT1 reaches the set time, the normally open contact of the first time relay KT1 in the L3 branch is closed. At this time, the coil of the first relay KA1 is energized, and the normally open contact of the first relay KA1 in the L1 branch is closed, and the energy storage indicator light HL1 is lit, indicating that the energy storage signal sent by the FTU feeder terminal is normal, otherwise it is abnormal; when the electric control circuit receives the closing signal, because the signal isolation switch SB1 is in the closed state, the coil of the eighth relay KA8 in the L7 branch is energized, the normally open contact of the eighth relay KA8 is closed, the coil of the tenth relay KA10 is energized, the normally open contact of the tenth relay KA10 is closed, the signal input end of the self-locking relay module RM is triggered, and the normally open contact of the self-locking relay module RM in the spring-operated closing circuit is closed. The normally open contact of the first time relay KT1 after energy storage is closed. At this time, the spring-operated closing circuit forms a path, the coil of the third relay KA3 is energized, and the normally open contact of the third relay KA3 in the L4 branch is closed. At this time, the closing indicator light HL3 is lit, indicating that the closing signal sent by the FTU feeder terminal is normal, otherwise it is abnormal;

[0033] When performing the opening detection, the FTU feeder terminal sends an opening signal to the positive and negative opening terminals of the aviation socket. When the relay control circuit receives the opening signal, the coil of the fourth relay KA4 is energized, and the normally open contact of the fourth relay KA4 in the L5 branch is closed, and the opening indicator light HL4 is lit, indicating that the opening signal sent by the FTU feeder terminal is normal, otherwise it is abnormal. It should be noted that when performing the opening and closing detection on the FTU feeder terminal, the opening and closing signals sent by the FTU feeder terminal are not synchronized, that is, when the FTU feeder terminal sends a closing signal, the opening signal disappears; when the FTU feeder terminal sends an opening signal, the closing signal disappears;

[0034] When performing the detection of the permanent magnet type FTU feeder terminal, the change-over switch SA is in the permanent magnet position. At this time, the first normally open contact SA-1 and the second normally open contact SA-2 of the change-over switch SA are in the closed state, and the remote signaling disconnecting switch SB1 is disconnected. At this time, the coil of the eighth relay KA8 loses power, and the normally open contact of the eighth relay KA8 changes from the closed state to the open state. When performing the closing detection, the FTU feeder terminal sends a closing signal to the closing positive terminal and the closing negative terminal of the cable socket. The coil of the tenth relay KA10 is energized, and the normally open contact of the tenth relay KA10 closes. The signal input terminal of the self-locking relay module RM is triggered and self-locked. The normally open contact of the self-locking relay module RM in the L2 branch closes, causing the permanent magnet closing indicator light HL2 to light up, indicating that the closing signal sent by the FTU feeder terminal is normal, otherwise it is abnormal; when performing the opening detection, the coil of the eleventh relay KA11 is energized, and the normally open contact of the eleventh relay KA11 closes. The signal input terminal of the self-locking relay module RM is triggered and self-locked. The normally open contact of the self-locking relay module RM in the L2 branch changes from the closed state to the open state, causing the permanent magnet closing indicator light HL2 to go out, indicating that the opening signal sent by the FTU feeder terminal is normal, otherwise it is abnormal. It should be noted that those skilled in the art should understand that the self-locking relay module RM is a relay module with multiple self-locking functions. When the signal input terminal of the self-locking relay module RM is energized for the first time, it will control the normally open contact of the relay to close (the normally closed contact to open), and when it is energized for the second time, it will control the normally open contact of the relay after closing to open (the normally closed contact after opening to close).

[0035] In this embodiment, the relay control circuit can be used to replace the actual circuit breaker to simulate signals such as closing, opening, and energy storage, realizing mechanical replacement and reducing the detection difficulty; the change-over switch SA is used to select the spring-operated type or the permanent magnet type to adapt to the spring-operated type or the permanent magnet type FTU feeder terminal, which can meet the test requirements of the permanent magnet type and spring-operated type FTUs in the existing domestic market and effectively solve the problem of single test products for FTU feeder terminals.

[0036] In an embodiment of the present invention, the L4 branch further includes the coil of the fifth relay KA5 and the normally open contact of the fifth relay KA5. The coil of the fifth relay KA5 is connected in parallel with the closing indicator light HL3, and the normally open contact of the fifth relay KA5 is connected in parallel with the normally open contact of the third relay KA3. Through the above settings, during the closing detection of the spring-operated type FTU feeder terminal, when the normally open contact of the third relay KA3 closes, the coil of the fifth relay KA5 is energized, and the normally open contact of the fifth relay KA5 closes to form self-locking, so that the closing indicator light HL3 remains lit until the next opening, playing a role in state maintenance and preventing the occurrence of repeated closing detections at the same time.

[0037] In an embodiment of the present invention, the L4 branch further includes the coil of the second time relay KT2, and the coil of the second time relay KT2 is connected in parallel with the closing indicator light HL3; the L6 branch further includes the normally closed contact of the fifth relay KA5 and the normally open contact of the second time relay KT2. The normally closed contact of the five-relay KA5 is connected in series between the live wire terminal L of the power socket and the normally open contact of the second relay KA2, and the normally open contact of the second time relay KT2 is connected in parallel with the normally closed contact of the fifth relay KA5 and the normally open contact of the second relay KA2. Through the above settings, during the closing detection process of the spring-operated FTU feeder terminal, after the coil of the fifth relay KA5 is powered on, the normally closed contact of the fifth relay KA5 in the L6 branch disconnects, and the energy storage indicator light HL1 goes out, simulating the completion of the circuit breaker closing; after the coil of the second time relay KT2 is powered on, after a certain delay, the normally open contact of the second time relay KT2 in the L6 branch closes, and the coil of the first time relay KT1 is in the secondary powered-on state, causing the energy storage indicator light HL1 to be lit again for the second time, simulating the energy storage after the circuit breaker closing.

[0038] In an embodiment of the present invention, the L5 branch further includes the coil of the sixth relay KA6 and the normally open contact of the sixth relay KA6. The coil of the sixth relay KA6 is connected in parallel with the opening indicator light HL4, and the normally open contact of the sixth relay KA6 is connected in parallel with the normally open contact of the fourth relay KA4. Through the above settings, during the opening detection process of the spring-operated FTU feeder terminal, when the normally open contact of the fourth relay KA4 closes, the coil of the sixth relay KA6 is powered on, and the normally open contact of the sixth relay KA6 closes to form a self-locking, so that the opening indicator light HL4 remains lit until the next closing, playing a role in state maintenance, and at the same time preventing the occurrence of repeated opening detection.

[0039] In an embodiment of the present invention, the relay control circuit further includes a voltage regulator TC and a first transformer TM1. The two ends of the primary coil of the voltage regulator TC are respectively connected to the neutral line terminal N and the live line terminal L of the power socket. The two ends of the secondary coil of the voltage regulator TC are correspondingly connected to the primary coil of the first transformer TM1. One end of the secondary coil of the first transformer TM1 is connected to the first common terminal of the aviation socket. The other end of the secondary coil of the first transformer TM1 is sequentially connected with a current transformer, a fuse, a normally open contact of the self-locking relay module RM, and a current output switching switch in series. The current output switching switch includes a plurality of knob switches connected in parallel with each other. Each knob switch is correspondingly connected to each current terminal of the aviation socket to form a current output loop. More specifically, the current output switching switch is set to four, namely the phase A current switch, the phase B current switch, the phase C current switch, and the zero-sequence current switch, which are respectively connected to the phase A current terminal, the phase B current terminal, the phase C current terminal, and the zero-sequence current terminal of the aviation socket. The output of 0-15A current is realized through the voltage regulator TC. The current passes through the current transformer from the secondary end of the first transformer TM1. The current transformer is of class 0.1S with a turns ratio of 20 to 1 to measure the output current. Through the current output switching switch, the output current is switched to the FTU feeder terminal to test whether the telemetry values such as the phase A current, phase B current, phase C current, and zero-sequence current of the FTU feeder terminal, the setting values, and the alarm parameters are correct, and to detect whether the FTU feeder terminal can perform a fault alarm action (overcurrent tripping operation).

[0040] In an embodiment of the present invention, the relay control circuit further includes an ammeter A. The two ends of the ammeter A are correspondingly connected to the live line terminal L and the neutral line terminal N of the power socket. By comparing the current values through the ammeter A, the parameter comparison between the test device and the product is realized. Existing circuit breaker products cannot realize the function of current data comparison, and the precision measurement of the product is realized. More specifically, the set current value adjusted by the voltage regulator TC is measured by the ammeter A. The FTU feeder terminal will collect a sampled current, and the set current value and the sampled current are compared to detect the precision of the FTU feeder terminal.

[0041] In an embodiment of the present invention, the L7 branch further includes the coil of the ninth relay KA9, and the coil of the ninth relay KA9 is connected in parallel with the coil of the eighth relay KA8; the current output circuit further includes the normally closed contact of the ninth relay KA9 and the normally open contact of the fifth relay KA5, the normally closed contact of the ninth relay KA9 is connected in parallel with the normally open contact of the fifth relay KA5, and the normally open contact of the fifth relay KA5 is connected in series between the fuse and the normally open contact of the self-locking relay module RM. The above settings are used to distinguish between the spring-operated type and the permanent magnet type output current detections. Specifically, when the change-over switch is in the spring-operated type, the coils of the ninth relay KA9 and the fifth relay KA5 are energized, and the self-locking relay module RM receives a trigger signal. At this time, the normally closed contact of the ninth relay KA9 is disconnected, and the normally open contacts of the fifth relay KA5 and the self-locking relay module RM are closed to form a path; when the change-over switch is in the permanent magnet type, the coils of the ninth relay KA9 and the fifth relay KA5 are de-energized, and the self-locking relay module RM receives a trigger signal. At this time, the normally closed contact of the ninth relay KA9 changes from the disconnected state to the closed state, the normally open contact of the fifth relay KA5 changes from the closed state to the disconnected state, and the normally open contact of the self-locking relay module RM is closed, and the current flows through the normally closed contact of the ninth relay KA9 and the normally open contact of the self-locking relay module RM to form a path, thereby distinguishing between the spring-operated type and the permanent magnet type current output detections.

[0042] In an embodiment of the present invention, the normally open contact of the first relay KA1 is connected in series between the second common terminal and the energy storage terminal of the aviation socket to form an energy storage tele-signaling circuit. With the above settings, when the normally open contact of the first relay KA1 is closed, the energy storage tele-signaling circuit forms a path, and at this time, an energy storage tele-signaling signal will be sent, indicating that energy storage is in progress.

[0043] In an embodiment of the present invention, the normally open contacts of the fifth relay KA5, the normally open contacts of the eighth relay KA8, and the normally open contacts of the self-locking relay module RM are sequentially connected in series between the second common terminal and the closing terminal of the aviation socket. Moreover, a normally closed contact of the eighth relay KA8 (i.e., the normally closed contact of the eighth relay KA8 is connected to the connection point between the second common terminal and the connection point of the normally open contacts of the eighth relay KA8 and the self-locking relay module RM) is provided in parallel with the normally open contacts of the eighth relay KA8 and the self-locking relay module RM, forming a closing remote signaling circuit. Through the above arrangement, the isolation of the closing remote signaling signals between the spring-operated type and the permanent magnet type can be achieved through the normally open and normally closed contacts of the eighth relay KA8. Specifically, when closing in the spring-operated type mode, the normally open contacts of the fifth relay KA5, the normally open contacts of the eighth relay KA8, and the normally open contacts of the self-locking relay module RM are all closed, and the normally closed contact of the eighth relay KA8 is opened. The current flows through the normally open contacts of the fifth relay KA5, the normally open contacts of the eighth relay KA8, and the normally open contacts of the self-locking relay module RM to form a path to trigger the spring-operated type closing remote signaling signal. When closing in the permanent magnet type mode, the normally open contact of the fifth relay KA5 does not act, the normally open and normally closed contacts of the eighth relay KA8 do not act, and the normally open contact of the self-locking relay module RM is closed. The current flows through the normally closed contact of the eighth relay KA8 and the normally open contact of the self-locking relay module RM to form a path to trigger the permanent magnet type closing remote signaling signal.

[0044] In an embodiment of the present invention, the normally open contacts of the sixth relay KA6, the normally open contacts of the eighth relay KA8, and the normally closed contacts of the self-locking relay module RM are connected in series in sequence between the second common terminal and the opening terminal of the aviation socket. Moreover, a normally closed contact of the eighth relay KA8 (i.e., the normally closed contact of the eighth relay KA8 is connected to the connection point between the second common terminal and the connection point of the normally open contact of the eighth relay KA8 and the normally closed contact of the self-locking relay module RM) is provided in parallel with the normally open contact of the eighth relay KA8 and the normally closed contact of the self-locking relay module RM, forming an opening remote signaling circuit. Through the above arrangement, isolation of the opening remote signaling signals between the spring-operated type and the permanent magnet type can be achieved by means of the normally open and normally closed contacts of the eighth relay KA8. Specifically, when opening in the spring-operated mode, the normally open contacts of the sixth relay KA6 and the normally open contacts of the eighth relay KA8 are closed and the normally closed contacts are opened, and the normally closed contacts of the self-locking relay module RM do not act. The current flows through the normally open contacts of the sixth relay KA6, the normally open contacts of the eighth relay KA8, and the normally closed contacts of the self-locking relay module RM to form a path to trigger the spring-operated opening remote signaling signal; when opening in the permanent magnet mode, the normally open contacts of the sixth relay KA6 do not act, the normally open and normally closed contacts of the eighth relay KA8 do not act, and the normally closed contacts of the self-locking relay module RM do not act. The current flows through the normally closed contacts of the eighth relay KA8 and the normally closed contacts of the self-locking relay module RM to form a path to trigger the permanent magnet opening remote signaling signal.

[0045] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and simple improvements made to the substantial content of the present invention shall be included within the protection scope of the present invention.

Claims

1. A detection device for an FTU feeder terminal, characterized in that: It includes a housing, on which there are a power socket and an aviation socket. The aviation socket has multiple connection terminals. Inside the housing, there is a relay control circuit, which includes a change-over switch SA, a rectifier, a self-locking relay module RM, a first relay KA1, a second relay KA2, a third relay KA3, a fourth relay KA4, an eighth relay KA8, a tenth relay KA10, an eleventh relay KA11, a first time relay KT1, and a second transformer TM2. Both ends of the coil of the second relay KA2 are correspondingly connected to the energy storage positive terminal and the energy storage negative terminal of the aviation socket to form a spring-operated energy storage circuit. The AC end of the rectifier is correspondingly connected to the live wire terminal L and the neutral wire terminal N of the power socket. The positive and negative poles of the self-locking relay are correspondingly connected to the positive and negative poles of the DC end of the rectifier. The first normally closed contact SA-1 of the change-over switch SA, the normally open contact of the self-locking relay module RM, the normally open contact of the first time relay KT1, the coil of the third relay KA3, and the second normally closed contact SA-2 of the change-over switch SA are sequentially connected in series between the closing positive terminal and the closing negative terminal of the aviation socket to form a spring-operated closing circuit. Both ends of the coil of the fourth relay KA4 are correspondingly connected to the opening positive terminal and the opening negative terminal of the aviation socket to form a spring-operated opening circuit. The first normally open contact SA-3 of the change-over switch SA, the coil of the tenth relay KA10, and the second normally open contact SA-4 of the change-over switch SA are sequentially connected in series between the closing positive terminal and the closing negative terminal of the aviation socket. Both ends of the coil of the tenth relay KA10 are connected in parallel with the normally open contact of the self-locking relay module RM and the coil of the eleventh relay KA11 connected in series. The negative pole of the DC end of the rectifier is connected to one end of the coil of the tenth relay KA10 through the normally open contact of the eighth relay KA8. The other end of the coil of the tenth relay KA10 is connected to the positive pole of the DC end of the rectifier to form a permanent magnet type closing and opening circuit. Both ends of the primary coil of the second transformer TM2 are correspondingly connected to the neutral wire terminal N and the live wire terminal L of the power socket. One end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage positive terminal of the aviation socket through a zero-sequence voltage switch SB2. The other end of the secondary coil of the second transformer TM2 is connected to the zero-sequence voltage negative terminal of the aviation socket to form a zero-sequence voltage output circuit. There are L1-L7 branches connected in parallel between the live wire terminal L and the neutral wire terminal N of the power socket; the L1 branch includes the normally open contact of the first relay KA1 and the energy storage indicator light HL1 connected in series in sequence; the L2 branch includes the normally open contact of the self-locking relay module RM and the permanent magnet closing indicator light HL2 connected in series in sequence; the L3 branch includes the normally open contact of the first time relay KT1 and the coil of the first relay KA1 connected in series in sequence; the L4 branch includes the normally open contact of the third relay KA3, the normally closed contact of the fourth relay KA4 and the closing indicator light HL3 connected in series in sequence; the L5 branch includes the normally open contact of the fourth relay KA4, the normally closed contact of the third relay KA3 and the opening indicator light HL4 connected in series in sequence; the L6 branch includes the normally open contact of the second relay KA2 and the coil of the first time relay KT1 connected in series in sequence; the L7 branch includes the remote signaling disconnecting switch SB1 and the coil of the eighth relay KA8 connected in series in sequence.

2. The detection device for an FTU feeder terminal according to claim 1, characterized in that: The L4 branch further includes the coil of the fifth relay KA5 and the normally open contact of the fifth relay KA5. The coil of the fifth relay KA5 is connected in parallel with the closing indicator light HL3, and the normally open contact of the fifth relay KA5 is connected in parallel with the normally open contact of the third relay KA3.

3. The detection device for an FTU feeder terminal according to claim 2, characterized in that: The L4 branch further includes the coil of the second time relay KT2. The coil of the second time relay KT2 is connected in parallel with the closing indicator light HL3; the L6 branch further includes the normally closed contact of the fifth relay KA5 and the normally open contact of the second time relay KT2. The normally closed contact of the fifth relay KA5 is connected in series between the live wire terminal L of the power socket and the normally open contact of the second relay KA2, and the normally open contact of the second time relay KT2 is connected in parallel with the normally closed contact of the fifth relay KA5 and the normally open contact of the second relay KA2.

4. The detection device for an FTU feeder terminal according to claim 1, characterized in that: The L5 branch further includes the coil of the sixth relay KA6 and the normally open contact of the sixth relay KA6. The coil of the sixth relay KA6 is connected in parallel with the opening indicator light HL4, and the normally open contact of the sixth relay KA6 is connected in parallel with the normally open contact of the fourth relay KA4.

5. The detection device for an FTU feeder terminal according to claim 2, characterized in that: The relay control circuit further includes a voltage regulator TC and a first transformer TM1. The two ends of the primary coil of the voltage regulator TC are respectively connected to the neutral wire terminal N and the live wire terminal L of the power socket. The two ends of the secondary coil of the voltage regulator TC are correspondingly connected to the primary coil of the first transformer TM1. One end of the secondary coil of the first transformer TM1 is connected to the first common terminal of the aviation socket. The other end of the secondary coil of the first transformer TM1 is sequentially connected with a current transformer, a fuse, the normally open contact of the self-locking relay module RM and a current output switching switch. The current output switching switch includes a plurality of rotary switches connected in parallel with each other. Each rotary switch is correspondingly connected to each current terminal of the aviation socket to form a current output loop.

6. The detection device for an FTU feeder terminal according to claim 5, characterized in that: The L7 branch also includes the coil of the ninth relay KA9. The coil of the ninth relay KA9 is connected in parallel with the coil of the eighth relay KA8. In the current output circuit, it also includes the normally closed contact of the ninth relay KA9 and the normally open contact of the fifth relay KA5. The normally closed contact of the ninth relay KA9 is connected in parallel with the normally open contact of the fifth relay KA5. The normally open contact of the fifth relay KA5 is connected in series between the fuse and the normally open contact of the self-locking relay module RM.

7. The detection device for an FTU feeder terminal according to claim 1, characterized in that: The normally open contact of the first relay KA1 is connected in series between the second common terminal and the energy storage terminal of the aviation socket, forming an energy storage telemetry circuit.

8. The detection device for an FTU feeder terminal according to claim 2, characterized in that: The normally open contact of the fifth relay KA5, the normally open contact of the eighth relay KA8, and the normally open contact of the self-locking relay module RM are connected in series between the second common terminal and the closing terminal of the aviation socket. And there is also a normally closed contact of the eighth relay KA8 connected between the second common terminal and the connection point of the normally open contact of the eighth relay KA8 and the normally open contact of the self-locking relay module RM, forming a closing telemetry circuit.

9. The detection device for an FTU feeder terminal according to claim 4, characterized in that: The normally open contact of the sixth relay KA6, the normally open contact of the eighth relay KA8, and the normally closed contact of the self-locking relay module RM are connected in series between the second common terminal and the opening terminal of the aviation socket. And there is also a normally closed contact of the eighth relay KA8 connected between the second common terminal and the connection point of the normally open contact of the eighth relay KA8 and the normally closed contact of the self-locking relay module RM, forming an opening telemetry circuit.

10. The detection device for an FTU feeder terminal according to any one of claims 1-9, characterized in that: The relay control circuit also includes an ammeter A. The two ends of the ammeter A are correspondingly connected to the live wire terminal L and the neutral wire terminal N of the power socket.

Images