CN204789954U - A simulated failure smart electric meter and electric test simulation device for three phase current - Google Patents

Abstract

The utility model relates to a fault-simulating intelligent electric meter for three-phase power supply and an electrical test simulation device based on the fault-simulating intelligent electric meter. The utility model can simulate and realize grid operation events, simulate typical faults of electric energy meters, simulate faults such as harmonic tests of electric grids, and enable trainees to familiarize themselves with the working principle of electric energy meters through understanding, learning and training. When there is an abnormal failure on the electric energy meter field, the trainees can quickly and accurately deal with the electric energy meter fault and issue a systematic and complete fault report, and provide services for the power companies of various grid provinces and electric energy meter manufacturers in the application development and technical research of electric energy meters, etc. It provides a lot of practical basis.

Description

Simulated fault smart meter and electrical test simulation device for three-phase power supply

technical field

The utility model relates to the technical field of teaching test systems, more specifically, to a fault-simulating intelligent electric meter for three-phase power supply, and an electrical test simulation device based on the above-mentioned fault-simulating intelligent electric meter.

Background technique

With the construction of smart grid, single-phase and three-phase smart energy meters have been widely used in power metering, but many problems have been found in the process of use, and the faulty meters found on site can be directly replaced by the meter manufacturer. , Due to the limitation of the technical level of the on-site meter installation electrician and operation and maintenance personnel, it is impossible to make a complete and systematic fault report on the fault of the electric energy meter. Conduct in-depth research.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a fault-simulating smart meter for three-phase power supply that simulates faults such as power grid operation events, simulated typical faults of electric energy meters, and simulated faults such as harmonic tests of the power grid, as well as electrical Test simulator.

The technical scheme of the utility model is as follows:

A fault simulation smart meter for three-phase power supply is provided with a fault simulation control device connected to a hardware module, and the fault simulation control device changes the wiring of the hardware module to cause a corresponding hardware fault to occur in the hardware module.

As preferably, the hardware module includes a 485 communication module, and the receiving differential signal end and the sending differential signal end of the RS485 interface chip of the 485 communication module are respectively connected to the signal source through the first switch and the second switch to control the receiving differential signal end and the sending differential signal end respectively. The disconnection and closure of the signal terminal, as well as the reverse connection between the receiving differential signal terminal and the transmitting differential signal terminal and the signal source.

As preferably, the receiving differential signal end is connected to the signal output end of the signal source through the first switch, and the sending differential signal end is connected to the signal input end of the signal source through the second switch; the signal output end of the signal source is also provided with a second output end for The second switch is connected, and the signal input terminal of the signal source is also provided with a second input terminal for the connection of the first switch.

As a preference, when the first switch and the second switch are respectively connected to the receiving differential signal terminal and the transmitting differential signal terminal, the RS485 interface chip is correctly connected to the signal source; when the first switch is disconnected, the simulated receiving differential signal terminal fails; the second switch When it is disconnected, simulate the failure of the sending differential signal terminal; when the first switch and the second switch are respectively connected to the second output terminal and the second input terminal, the receiving differential signal terminal of the RS485 interface chip, the transmitting differential signal terminal and the signal input of the signal source Terminal, signal output terminal connection, simulate RS485 interface chip and signal source reverse connection fault.

Preferably, the hardware module includes a three-phase power supply sampling circuit, and a switch is provided in each phase sampling sub-circuit to change the sampling resistance of each phase sampling sub-circuit respectively, or control the disconnection and connection between each phase sampling sub-circuit and the metering chip.

As preferably, the sampling sub-circuit of each phase is provided with several resistors connected in series, wherein the sampling sub-circuits of two phases are respectively connected in parallel with the third switch and the fourth switch, and the sampling sub-circuit of another phase is connected in series with the fifth switch; the third When the switch and the fourth switch are off, the sampling sub-circuit is normal; when the third switch and the fourth switch are closed, respectively short-circuit part of the resistance, change the total resistance of the sampling sub-circuit, and simulate the measurement accuracy out-of-tolerance fault; the fifth switch is closed , the sampling sub-circuit is correctly connected to the metering chip, and when the fifth switch is disconnected, the metering chip cannot sample the phase voltage, simulating a metering accuracy out-of-tolerance fault.

Preferably, the hardware module includes a meter power supply circuit, and a switch is provided on the power supply circuit of the meter power supply.

Preferably, the input end of the voltage regulator tube of the meter power supply circuit is provided with a sixth switch. When the sixth switch is closed, the meter power supply circuit supplies power normally. When the sixth switch is turned off, the input terminal of the voltage regulator tube has no voltage input. , Analog meter power supply failure.

Preferably, the fault simulation control device includes a switch and a host computer, the switch is a relay, and the host computer controls the opening and closing of the relay.

An electrical test simulation device, comprising the described simulated fault smart ammeter for a three-phase power supply, a normal electric energy meter, an oscilloscope, a normal meter power supply connected to the normal electric energy meter, and a simulated fault meter power supply of the simulated fault smart electric meter ; When the hardware fault of the simulated fault smart meter is simulated, the fault result is displayed as a waveform by the oscilloscope.

As a preference, the simulated fault smart meter and the normal electric energy meter are installed on the panel of the device through the pressure meter frame, and the simulated fault smart electric meter and the normal electric energy meter are respectively equipped with automatic crimping devices; the oscilloscope is embedded in the device panel.

The beneficial effects of the utility model are as follows:

The utility model can simulate and realize grid operation events, simulate typical faults of electric energy meters, simulate faults such as harmonic tests of electric grids, and enable students to familiarize themselves with the working principle of electric energy meters through understanding, learning and training. When there is an abnormal failure on the electric energy meter field, the trainees can quickly and accurately deal with the electric energy meter fault and issue a systematic and complete fault report, and provide assistance for the application development and technical research of the electric energy meter in the power companies of various grid provinces and electric energy meter manufacturers. It provides a lot of practical basis.

When simulating power grid events, it is realized through the three-phase standard analog power supply and the fault simulation controller, and the three-phase standard analog power supply realizes the fault simulation of the voltage and current connected to the electric energy meter through the wiring control box.

The internal hardware faults of the electric energy meter are realized by adding fault simulation relays, and the number of hardware faults that can be realized can reach dozens of types.

According to the specific requirements of the implementation, the simulated smart meter configured by the utility model can simulate the electric energy meters of Wasion, Kelu, Wansheng, Holley, Samsung and other manufacturers. In addition to the functions of the smart meter, the simulated smart meter can also be simulated. The failure of the electric energy meter in the actual field, through the understanding and learning of the fault, the ability of the electric energy meter maintenance personnel to deal with the abnormal fault of the electric energy meter is improved.

Description of drawings

Figure 1 is a fault simulation circuit diagram of the 485 communication module;

Fig. 2 is a fault simulation circuit diagram of a three-phase power sampling circuit;

Fig. 3 is a fault simulation circuit diagram of the meter power supply circuit;

Fig. 4 is the schematic diagram of electrical test simulation device;

Figure 1, Figure 2, and Figure 3 only show the circuit schematics corresponding to the characteristic parts, and are not complete circuit diagrams;

In the figure: 10 is the pressure meter frame, 11 is the normal electric energy meter, 12 is the automatic crimping device, 13 is the normal meter power supply, 14 is the simulated fault meter power supply, 15 is the simulated fault smart meter, 16 is the oscilloscope, 17 is Start-stop button, 18 is device panel.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The purpose of the utility model is to provide a multifunctional electrical test simulation device. The electrical test simulation device adopts a simulated electric energy meter to simulate internal faults of the electric energy meter, and can also simulate external faults of the electric energy meter. The utility model also provides a smart meter for simulating a fault. The basis for the design of the smart meter for simulating a fault is Q/GDW356-2009 "Specification for Types of Three-phase Smart Electric Energy Meters". Three-wire, three-phase four-wire), according to the implementation requirements, it can simulate meters including the commonly used electric energy meters of Wasion, Kelu, Wansheng, Holley, Samsung and other manufacturers.

The fault simulation smart meter for three-phase power supply described in the utility model is provided with a fault simulation control device, which is connected to the hardware module, and the fault simulation control device changes the wiring of the hardware module to make the hardware module corresponding hardware malfunction.

The utility model can realize all hardware fault simulations according to the requirements of actual implementation and the specific conditions of the smart meters that need to be simulated. The following three hardware modules are taken as examples to illustrate the hardware fault simulation. The fault simulation control device includes a switch and a host computer, the following switches are relays, and the host computer controls the opening and closing of the relays.

When the hardware module includes a 485 communication module, as shown in Figure 1, the receiving differential signal end and the sending differential signal end of the RS485 interface chip (the present embodiment takes MAX485 as an example) respectively pass through the first switch (relay K1) of the 485 communication module , The second switch (relay K2) is connected to the signal source, respectively controls the opening and closing of the receiving differential signal terminal and the transmitting differential signal terminal, and the reverse connection between the receiving differential signal terminal and the transmitting differential signal terminal and the signal source, simulating RS485 wiring error communication Fault.

The receiving differential signal end is connected to the signal output end of the signal source through the first switch (relay K1), and the sending differential signal end is connected to the signal input end of the signal source through the second switch (relay K2); the signal output end of the signal source is also set The second output terminal is connected to the second switch (relay K2), and the signal input terminal of the signal source is further provided with a second input terminal for connection to the first switch (relay K1).

Specifically, when the first switch (relay K1) and the second switch (relay K2) are respectively connected to the receiving differential signal terminal and the transmitting differential signal terminal, the RS485 interface chip is correctly connected to the signal source; the first switch (relay K1) is disconnected , simulate the failure of the receiving differential signal terminal; when the second switch (relay K2) is disconnected, simulate the failure of the transmitting differential signal terminal; the first switch (relay K1), the second switch (relay K2) and the second output terminal, the second output terminal When the two input terminals are connected, the receiving differential signal terminal and the transmitting differential signal terminal of the RS485 interface chip are connected to the signal input terminal and signal output terminal of the signal source to simulate the reverse connection fault between the RS485 interface chip and the signal source.

When the hardware module includes a three-phase power sampling circuit, as shown in Figure 2, set switches in the sampling sub-circuits of each phase to change the sampling resistance of the sampling sub-circuits of each phase, or control the disconnection between the sampling sub-circuits of each phase and the metering chip. Open and connect, simulate the measurement accuracy out-of-tolerance fault.

Specifically, the sampling sub-circuits of each phase are provided with several resistors connected in series, in which the sampling sub-circuits of two phases are respectively connected in parallel with the third switch (relay K3) and the fourth switch (relay K4), and the sampling sub-circuit of the other phase The circuit connects a fifth switch (relay K5) in series. When the third switch (relay K3) and the fourth switch (relay K4) are disconnected, the sampling sub-circuit is normal; when the third switch (relay K3) and the fourth switch (relay K4) are closed, respectively short-circuit part of the resistance to change the sampling The total resistance of the sub-circuit, the analog measurement accuracy out-of-tolerance fault; in order to realize the diversity of faults, in the present embodiment, the third switch (relay K3) and the fourth switch (relay K4) short-circuit the resistance quantity and position respectively Are not the same. When the fifth switch (relay K5) is closed, the sampling sub-circuit is correctly connected to the metering chip, and the metering chip normally samples the phase voltage. When the fifth switch (relay K5) is turned off, the metering chip cannot sample the phase voltage. Measurement accuracy out of tolerance fault.

When the hardware module includes a meter power supply circuit, as shown in Figure 3, a switch is set on the power supply circuit of the meter power supply to simulate a meter power supply failure.

Specifically, a sixth switch (relay K6) is set at the input end of the voltage regulator tube of the meter power supply circuit (the LM7805 is used as an example in this embodiment). When the sixth switch (relay K6) is closed, the meter power supply circuit supplies power normally. , when the sixth switch (relay K6) is disconnected, the input terminal of the regulator tube has no voltage input, and the power supply of the analog meter is faulty.

Based on the above-mentioned simulated fault smart meter for three-phase power supply, the utility model also provides a kind of electrical test simulation device, as shown in Figure 4, including simulated fault smart meter 15, normal electric energy meter 11, oscilloscope 16, and normal electric energy The normal meter power supply 13 that table 11 is connected, and the simulated fault meter power supply 14 of the simulated fault smart meter 15; after the hardware failure of the simulated fault smart meter 15 is simulated to occur, the fault result is carried out waveform display by the oscilloscope 16. The oscilloscope 16 can also receive the waveform of the normal electric energy meter 11 at the same time, which facilitates the comparison between the normal waveform and the fault waveform, and is more conducive to comparative learning.

In order to facilitate observation and operation, the simulated fault smart meter 15 and the normal electric energy meter 11 are installed on the device panel 18 through the pressure gauge frame 10, and the simulated fault smart electric meter 15 and the normal electric energy meter 11 are respectively provided with an automatic crimping device 12; the oscilloscope 16 is embedded Installed in the device panel 18. The interface between the normal meter power supply 13 and the simulated fault meter power supply 14 is arranged on the device panel 18 . The electrical test simulation device is also provided with a start-stop button 17, including start, stop and reset.

The above-mentioned embodiments are only used to illustrate the utility model, but not to limit the utility model. As long as it is based on the technical essence of the present utility model, changes and modifications to the above-mentioned embodiments will fall within the scope of the claims of the present utility model.

Claims (11)

1. the simulated failure intelligent electric meter for three-phase supply, it is characterized in that, be provided with fault simulation control device, fault simulation control device is connected with hardware module, fault simulation control device changes the wiring of hardware module, makes hardware module that corresponding hardware fault occur.

2. the simulated failure intelligent electric meter for three-phase supply according to claim 1, it is characterized in that, hardware module comprises 485 communication modules, reception differential signal end, the transmission differential signal end of the RS485 interface chip of 485 communication modules are connected with signal source respectively by the first switch, second switch, control receives differential signal end, sends the disconnection of differential signal end, closes respectively, and receives differential signal end, transmission differential signal end and signal source reversal connection.

3. the simulated failure intelligent electric meter for three-phase supply according to claim 2, it is characterized in that, receive differential signal end to be connected by the first switch with the signal output part of signal source, send differential signal end and be connected by second switch with the signal input part of signal source; The signal output part of signal source also arranges the second output terminal and connects for second switch, and the signal input part of signal source also arranges the second input end and connects for the first switch.

4. the simulated failure intelligent electric meter for three-phase supply according to claim 3, is characterized in that, the first switch, second switch respectively with reception differential signal end, send differential signal end be connected time, RS485 interface chip and signal source exact connect ion; When first switch disconnects, simulation receives differential signal end fault; When second switch disconnects, simulation sends differential signal end fault; When first switch, second switch are connected with the second output terminal, the second input end respectively, the reception differential signal end of RS485 interface chip, the signal input part sending differential signal end and signal source, signal output part are connected, simulation RS485 interface chip and signal source reversal connection fault.

5. the simulated failure intelligent electric meter for three-phase supply according to claim 1, it is characterized in that, hardware module comprises three-phase supply sample circuit, at the sampling electronic circuit of each phase, switch is set, change the sampling resistor of each phase sampler electronic circuit respectively, or the disconnection controlling each phase sampler electronic circuit and computation chip be connected.

6. the simulated failure intelligent electric meter for three-phase supply according to claim 5, it is characterized in that, the sampling electronic circuit of each phase is provided with several resistance of series connection, the sampling electronic circuit of two-phase the 3rd switch, the 4th switch in parallel respectively wherein, at sampling electronic circuit series connection the 5th switch of another phase; When 3rd switch, the 4th switch disconnect, sampling electronic circuit is normal, and when the 3rd switch, the 4th switch close, shorted section resistance respectively, changes the all-in resistance of sampling electronic circuit, the overproof fault of analog measurement accuracy; When 5th switch closes, sampling electronic circuit and computation chip exact connect ion, during the 5th switch disconnection, computation chip cannot be sampled this phase voltage, the overproof fault of analog measurement accuracy.

7. the simulated failure intelligent electric meter for three-phase supply according to claim 1, is characterized in that, hardware module comprises table meter power-supplying circuit, and the current supply circuit of table meter power supply arranges switch.

8. the simulated failure intelligent electric meter for three-phase supply according to claim 7, it is characterized in that, the input end of the stabilivolt of table meter power-supplying circuit arranges the 6th switch, when 6th switch closes, table meter power-supplying circuit normal power supply, when 6th switch disconnects, the input end no-voltage input of stabilivolt, simulation table meter Power supply fault.

9. the simulated failure intelligent electric meter for three-phase supply according to any one of claim 2 to 8, it is characterized in that, fault simulation control device comprises switch, host computer, and described switch is relay, and the disconnection of PC control relay is with closed.

10. an electrical test analogue means, it is characterized in that, comprise the simulated failure intelligent electric meter for three-phase supply described in any one of claim 1 to 9, normal electric energy meter, oscillograph, count power supply, with the simulated failure table meter power supply of simulated failure intelligent electric meter with normal the showing of normal electric energy list catenation; After the hardware fault of simulated failure intelligent electric meter is simulated generation, by oscillograph, fail result is carried out waveform display.

11. electrical test analogue means according to claim 10, is characterized in that, simulated failure intelligent electric meter, normal electric energy meter are arranged on device panel by pressure dial framework, and simulated failure intelligent electric meter, normal electric energy meter also arrange automatic crimping device respectively; Oscillograph is inlaid in device panel.