Automatic testing device for whole feeder line

Abstract

The invention discloses an automatic testing device for a whole-line feeder line. The automatic testing device is composed of a simulation circuit breaker tool, a simulation line tool, an addition detection tool and a transformer transformation part. Wherein the simulation circuit breaker tool is connected with each resistor LED lamp, each diode and each button switch through a 24V double-coil magnetic latching relay to simulate the on-off position and the non-energy-storage state of a real switch; the simulation line tool is connected in series with a terminal strip through a 24V relay, a simulation 10kV line is built into a 24V line, and the purpose of simulating the line is achieved; a large-current signal generated by a relay protection instrument is converted into a small-voltage signal through a mutual inductor, and a unified standard terminal strip is matched with the relay protection instrument to carry out an addition test on different devices; the automatic test device has the advantages of being low in manufacturing cost, small in occupied area, movable, convenient to carry, easy to operate, extensible in test scheme and the like, completely meets the requirement for automatic test of the whole feeder line of the distribution network, and is beneficial to practical popularization of power distribution automation.

Description

Technical Field

[0001] The invention belongs to the technical field of whole-line feeder testing, and in particular relates to a whole-line feeder automatic testing device. Background Art

[0002] At present, the on-site FA (Feeder Automation) self-healing strategy used in 10kV whole-line transmission lines requires testing of the whole-line equipment to avoid the adverse impact of the distribution terminal access to the actual distribution network for testing experiments on the safe operation of the power system.

[0003] Under the premise of promoting the on-site FA solution of the distribution network, the problem faced is that the equipment application layer faces huge challenges. Since the on-site FA solution involves many knowledge points, the on-site operation and maintenance personnel have a low level of acceptance of new knowledge and are unfamiliar with new things. The network commissioning personnel do not understand the automatic closing function of the on-site FA function, which greatly restricts the promotion and application of on-site FA.

[0004] The existing technical equipment scenarios are complex to set up, and require connecting multiple relay protection instruments to form a local area network using a computer, and then using specific software control to achieve the purpose of testing. The cost is extremely high, and simulations can be built in the laboratory, but this is not conducive to the promotion and improvement of the practical level of distribution automation. Summary of the invention

[0005] The purpose of the present invention is to provide an entire feeder automation test device, which utilizes a 24V circuit to simulate a line and matches it with a relay to simulate a fault operation, and designs a physical model hardware with protection, reclosing, and local FA functions for actual commissioning testing of line equipment; by conducting basic fault handling capability test experiments, it is verified that the entire line FA function of the line equipment is complete and can be officially put into operation without any problems, which can effectively improve the practical level of distribution automation.

[0006] To achieve the above object, the present invention provides the following technical solution: a whole line feeder automatic test device, which is composed of four parts: a simulated circuit breaker tool, a simulated line tool, an added quantity detection tool, and a transformer transformer; wherein, The simulated circuit breaker tooling connects the resistors, LED lights, diodes and push button switches through a 24V double-coil magnetic latching relay to simulate the closing and opening positions and the non-energy storage state of a real switch; The simulated line tooling is connected in series through a 24V relay and a terminal block, simulating a 10kV line as a 24V line to achieve the purpose of simulating the line; The quantity increase detection tooling converts the large current signal generated by the relay protection instrument into a small voltage signal through a mutual inductor, and uses a unified and standardized terminal block with the relay protection instrument to perform quantity increase tests on different equipment; Transformer transformation The voltage is converted into a voltage level suitable for power supply detection of equipment from different manufacturers through a transformer, providing a specific voltage for equipment from a specific manufacturer.

[0007] As a preferred technical solution of the present invention, the design corresponding to the simulated circuit breaker tooling includes two operation modes: One is to control the relay action through the closing and opening controller signals output by the FTU; the other is to perform local operation through an external power supply to simulate the main operation of the circuit breaker switch.

[0008] As a preferred technical solution of the present invention, the closing and opening controller signals output by the FTU are connected in series to the inside of the magnetic latching relay. When the FTU outputs a closing pulse signal, the closing coil action will remain in the closed position. At this time, the closing contact will act and feed back the closing signal to the FTU.

[0009] As a preferred technical solution of the present invention, an external power supply performs local operation to simulate the main operation of the circuit breaker switch. When the remote local dial is placed locally, the button can be pressed to operate the switch to open and close, and the FTU can be manually operated.

[0010] As a preferred technical solution of the present invention, the external switching signals of each simulated circuit breaker tooling in the simulated line tooling are respectively connected to the corresponding switch relay coils, and the normally open contacts of the relays are connected in series to a 24V DC power supply to simulate a real line.

[0011] As a preferred technical solution of the present invention, the simulated circuit breaker tooling uses an aviation plug cable to connect the FTU to achieve the function of simulating a real circuit breaker switch body.

[0012] As a preferred technical solution of the present invention, the added quantity detection tooling uses a unified standard terminal block in conjunction with a relay protection instrument to perform added quantity tests on different equipment, and simulates current values ​​to detect the correctness of protection settings, equipment configuration and FA functions of distribution automation equipment.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention has the characteristics of low cost, small footprint, portability, convenience, simple operation, and expandable test scheme, etc. It fully meets the needs of automatic test of the entire feeder line of the distribution network, and is of great benefit to the practical promotion of distribution automation. The present invention is suitable for training equipment operation and maintenance personnel who are new to intelligent switches, so as to facilitate the personnel to deepen their understanding. The 24V analog circuit in the present invention has the advantages of safety and convenience, and is low in cost and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the wiring diagram of the simulated circuit breaker tooling of the present invention; Figure 2 This is the wiring diagram of the analog circuit (24V) of the present invention; Figure 3 The transformer conversion principle diagram of the present invention; Figure 4 This is a schematic diagram of the analog circuit (24V) of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-Figure 4 The present invention provides an automatic test device for the whole line feeder, which is composed of four parts: a simulated circuit breaker tool, a simulated line (24V) tool, an added quantity detection tool, and a transformer transformer; wherein, The simulated circuit breaker tooling connects the resistors, LED lights, diodes and push button switches through a properly selected 24V double-coil magnetic latching relay to simulate the closing and opening positions, un-energy-storage state, etc. of the real switch. Then, it is connected to the FTU using an aviation plug cable to simulate the function of the real circuit breaker switch body. It is an important component for building a line to simulate the action of a 10kV line circuit breaker. The specific connection method of the simulated circuit breaker tooling is as follows: Figure 1(Simulated circuit breaker tooling wiring diagram), in the design, the double-coil magnetic latching relay is used to assume the function of opening and closing. The power supply 24V+ from the terminal is connected to 106 of the hand-close contact button and the hand-open contact button. The closing 24V+ from the terminal is connected to 107 of the hand-close contact button and the diode. The outlet 109 of the diode is connected to the closing coil. The opening 24V+ from the terminal is connected to 108 of the hand-open contact button and the diode. The outlet 110 of the diode is connected to the opening coil. The negative pole 111 of the closing coil and the opening coil is connected to the conversion button. The conversion button outlet is respectively connected to the closing and opening output 24- (here the closing 24- and the opening 24V- are connected in parallel) and the power supply 24-; in the design, the auxiliary node of the magnetic latching relay assumes the function of opening and closing indication. The power supply 24V+ is connected to the magnetic latching relay The closing contact and the opening contact 100 of the electrical appliance, the outlet of the closing contact is connected to the external signal 24V+ and the closing resistor 101, the closing resistor 103 is connected to the closing red light, the outlet of the opening contact is connected to the opening resistor 102, the opening resistor 104 is connected to the opening green light, the closing red light and the opening green light 105 are connected to the external signal 24- and the power supply 24V-; the action signal in the design is then fed back to the device under test through the relay contact, where the closing position is connected to the normally closed contact of the opening contact, the opening position is connected to the normally closed contact of the closing contact, the non-energy storage is connected to the non-energy storage boat-shaped button, the normally closed contact of the opening contact and the normally closed contact of the closing contact and the outlet of the non-energy storage boat-shaped button are connected to the remote signal common terminal 112; in addition, the non-energy storage 24+ is connected to the non-energy storage yellow light, and the negative pole of the non-energy storage yellow light is connected to the non-energy storage 24V-; The design has two modes of operation: The closing and opening controller signals output by the FTU are connected in series to the magnetic latching relay. For example, when the FTU outputs a closing pulse signal, the closing coil is activated and remains in the closed position. At this time, the closing contact is activated and the closing signal is fed back to the FTU, and the closing red light is on. The closing and opening signals here are the same. The simulated circuit breaker tooling has an external power supply for local operation to simulate the main operation of the circuit breaker switch. When the remote local dial is placed in the local position, the button can be pressed to operate the switch to open and close, and the FTU can be manually operated. For example, when operating the opening switch, first turn the remote local to the local conversion button to connect with 24V-, and then press the manual opening contact button. The opening coil is connected in series with the 24V power supply + to the opening coil, and the opening coil is activated and maintained in the opening position. At this time, the opening contact is activated, and the opening signal is fed back to the FTU, and the opening green light is on; the opening switch here, The same applies to closing the circuit breaker; in addition, there is an un-energy-stored signal that is directly connected to the un-energy-stored yellow light by the FTU output. When the un-energy-stored boat-shaped button is pressed, the FTU will output a 24V signal to turn on the un-energy-stored yellow light. In addition, the signal interface of the relay closing coil is taken in the design to connect the simulated line (24V) tooling to prepare for the subsequent line construction; the real circuit breaker is bulky, not conducive to frequent operation and inconvenient to carry. The design of this tooling has a simple structure and is practical and effective. It is very convenient to test the protection line, while reducing the cost of the test and improving the training efficiency.

[0017] The simulation line (24V) tooling is connected in series through a 24V relay and a terminal block to simulate the 10kV line as a 24V line to achieve the purpose of the simulation line. For specific connection methods, see Figure 2 , the external closing signal of each simulated circuit breaker fixture is connected to the corresponding switch relay coil; at the same time, the normally open contacts of the relay are connected in series to a 24V DC power supply to simulate the real circuit, where the 24V power supply of line 1 is connected to the power supply side of power supply No. 1 and the left side 201 of the normally open contact of switch relay No. 1, the right side of the normally open contact of switch relay No. 1 is connected to the power supply side of load No. 1 and the power supply side of power supply No. 2 and the left side 202 of the normally open contact of switch relay No. 2, the right side of the normally open contact of switch relay No. 2 is connected to the power supply side of load No. 2 and the power supply side of power supply No. 3 and the normally open contact 203 of switch relay No. 3, the right side of the normally open contact of switch relay No. 3 is connected to the power supply side of load No. 3, the power supply side of power supply No. 4, the power supply side of power supply No. 5, the normally open contact of switch relay No. 4 and the switch relay No. 5 Normally open contact 204, the right side of the normally open contact of switch relay No. 4 is connected to the power supply of load side No. 4, and the right side of the normally open contact of switch relay No. 5 is connected to the power supply of load side No. 5 and 2-way 24V power supply 205; the operating principle is: when switch fixture No. 2 is in the closed position, relay No. 2 is operated to make the power supply of load side No. 2 and power supply side No. 3 obtain 24V DC power; when switch fixture No. 3 is in the closed position, relay No. 3 is operated to make the power supply of load side No. 3 and power supply side No. 4 and power supply side No. 5 obtain 24V DC power, and so on. The corresponding switches are closed and opened to simulate the real line conditions. The use of this fixture improves the safety of the test environment and the equipment under test. In addition, the connection of each terminal block of the relay has the advantage of convenient and flexible modification, so that the simulated 24V line can be flexibly modified according to the 10kV line at any time.

[0018] The added current detection tooling converts the large current signal generated by the relay protection instrument into a small voltage signal through a properly selected mutual inductor, and then uses a unified and standardized terminal block with the relay protection instrument to add current to different devices for testing. It can simulate current values ​​to detect the protection settings, equipment configuration and FA function correctness of distribution automation equipment, and also ensure the consistency of test quality.

[0019] The transformer voltage is converted into a voltage level suitable for power supply detection of equipment from different manufacturers through a suitable transformer. For example, the transformer we selected is connected in series with a capacitor to reduce the voltage to a suitable level to power the equipment of Xi'an Xinghui (AC 40V3W). This method can provide a specific voltage for the equipment of a specific manufacturer, making the output voltage smoother, ensuring that the power supply side and the load side of the equipment are powered on, and solving the power supply problem of equipment from different manufacturers. You can refer to Figure 3 Transformer conversion schematic.

[0020] The four parts finally realize the demand for automatic testing of the entire distribution network feeder line. The specific connection method is as follows: Figure 4 (Simulation line (24V) schematic diagram), FTU is the device under test. FTU is connected to the circuit breaker fixture through the aviation plug cable matched by the manufacturer. FTU cooperates with the circuit breaker fixture to output the closing and opening position signal to control the action of the switch relay. The switch relay action controls the action of the simulation line fixture to make the transformer equipment output the corresponding power supply side and load side incoming call status. The power supply incoming call status is connected to the FTU device through the fixture and the aviation plug. After receiving the power signal, FTU will output the closing and opening energy storage signal according to its own position status. The output signal will control the switch relay through the circuit breaker fixture to achieve closed-loop test conditions for a single device. In addition, the telemetry adding fixture inputs the telemetry signal of the relay protection instrument to the FTU device through the aviation plug cable to simulate the voltage and current values ​​of the 10kV line, and then expands multiple switch relays to form a simulation line (24V) fixture to make the 24V line simulate the real 10kV line, and finally achieve the effect of simulation line linkage.

[0021] The present invention controls the action of the relay by outputting the closing and opening signals through the tooling, so as to achieve the purpose of controlling the incoming call status of the power supply side and the load side of the equipment under different states, and then builds a 24V line through the relay, so that the 24V line simulates the status of the real 10kV line outbound and contact power supply, and finally realizes the effect of simulation line linkage; when the equipment is increased, only one relay protection instrument is needed to be connected in series with the fault area equipment to achieve the effect of testing the FA line, and in the actual simulation, the switch position of the simulated line can be switched according to the actual line situation.

[0022] It is necessary to add that: The analog (24V) line can be replaced with other levels of lines, such as 6V, 12V, 36V; Currently, the equipment uses relays to achieve the purpose of simulating circuits. Under this model, PLCs and electronic chips can also be used to achieve the purpose of simulating circuits and circuit breakers.

[0023] Although the embodiments of the present invention have been shown and described, as detailed above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The whole line feeder automatic test device is characterized by: It consists of four parts: simulated circuit breaker tooling, simulated line tooling, added quantity detection tooling, and transformer transformation. The simulated circuit breaker tooling connects the resistors, LED lights, diodes and push button switches through a 24V double-coil magnetic latching relay to simulate the closing and opening positions and the non-energy storage state of a real switch; The simulated line tooling is connected in series through a 24V relay and a terminal block, simulating a 10kV line as a 24V line to achieve the purpose of simulating the line; The quantity increase detection tooling converts the large current signal generated by the relay protection instrument into a small voltage signal through a mutual inductor, and uses a unified and standardized terminal block with the relay protection instrument to perform quantity increase tests on different equipment; Transformer transformation The voltage is converted into a voltage level suitable for power supply detection of equipment from different manufacturers through a transformer, providing a specific voltage for equipment from a specific manufacturer.

2. The whole line feeder automatic test device according to claim 1 is characterized in that: The design corresponding to the simulated circuit breaker tooling includes two operation modes: One is to control the relay action through the closing and opening controller signals output by the FTU; the other is to perform local operation through an external power supply to simulate the main operation of the circuit breaker switch.

3. The whole line feeder automatic test device according to claim 2 is characterized in that: The closing and opening controller signals output by the FTU are connected in series to the magnetic latching relay. When the FTU outputs a closing pulse signal, the closing coil action will remain in the closed position. At this time, the closing contact will act and feed the closing signal back to the FTU.

4. The whole line feeder automatic test device according to claim 2 is characterized in that: The external power supply is used for local operation, simulating the main operation of the circuit breaker switch. When the remote local dial is placed locally, the button can be pressed to operate the switch to open and close, and the FTU can be manually operated.

5. The whole line feeder automatic test device according to claim 1 is characterized in that: The external closing signal of each simulated circuit breaker tool in the simulated line tool is respectively connected to the corresponding switch relay coil, and the normally open contact of the relay is connected in series to a 24V DC power supply to simulate a real line.

6. The whole line feeder automatic test device according to claim 1, characterized in that: The simulated circuit breaker tooling uses an aviation plug cable to connect the FTU to simulate the switch body function of a real circuit breaker.

7. The whole line feeder automatic test device according to claim 1 is characterized in that: The added quantity detection tooling uses a uniformly standardized terminal block in conjunction with a relay protection instrument to perform added quantity tests on different devices, and simulates current values ​​to detect the correctness of protection settings, equipment configuration, and FA functions of distribution automation equipment.

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