CN204720060U - A kind of low voltage electric energy measure device is installed and test training device - Google Patents

Abstract

The utility model relates to a kind of low voltage electric energy measure device and installs and test training device, comprise PLC, virtual power supply and low-voltage electric energy metering table, failure classes training Current Transformer analogue means is provided with between the current output terminal of described virtual power supply and the current input terminal of low-voltage electric energy metering table, the terminal box with impedance fault analog functuion is provided with between the voltage output end of described virtual power supply and the voltage input end of low-voltage electric energy metering table, described PLC is for controlling failure classes training Current Transformer analogue means, and the terminal box with impedance fault analog functuion carries out fault verification.It has various fault simulation, can carry out secondary pressure measurement and fall setting, current transformer polarity set, phase sequence setting.

Description

A low-voltage electric energy metering device installation and testing training device

technical field

The utility model relates to a teaching device for electric power industry education and training, in particular to a low-voltage electric energy metering device installation and testing training device.

Background technique

A large number of electric energy metering devices are installed in all links of power system generation, supply, and electricity consumption. Used to measure power generation, plant power consumption, power supply, electricity sales, etc. Electric energy metering devices include various types of electric energy meters, voltage and current transformers for metering and their secondary circuits, electric energy metering cabinets (boxes), etc. The existing low-voltage electric energy metering installation and testing training usually firstly combines pictures, videos, ppT and other means to explain, and then conducts on-site observation to teach students about the principles and operations of low-voltage electric energy metering installation and testing. However, for electrical equipment such as low-voltage electric energy metering installation and testing, the training effect of explanation and observation is very limited. The trainees do not know what phenomenon and consequences will occur under each fault, and it is difficult for the trainees to fully grasp it. Low-voltage electric energy metering installation, testing operation and a deep understanding of its principles.

Utility model content

The purpose of this utility model is to provide a low-voltage electric energy metering device installation and test training device for the deficiencies of the existing technology, which has various fault simulations, and can perform secondary voltage drop setting and current transformer polarity setting. setting, phase sequence setting.

The purpose of this utility model is achieved in that a low-voltage electric energy metering device installation and testing training device includes a PLC controller, a virtual power supply and a low-voltage electric energy meter, and the current output terminal of the virtual power supply is connected to the low-voltage electric energy meter. A current transformer simulation device for fault training is provided between the current input terminals, a junction box with impedance fault simulation function is provided between the voltage output terminal of the virtual power supply and the voltage input terminal of the low-voltage electric energy meter, and the PLC The controller is used to control the current transformer simulation device for fault training and the junction box with impedance fault simulation function for fault setting.

The current transformer simulation device for fault training is provided with a polarity setting fault point.

The current transformer simulation device for fault training includes a low-voltage current transformer shell, and the low-voltage current transformer shell is equipped with a current transformer, a tenth AC contactor (JK10), and a first AC contactor (JK1), The first primary-side wiring interface on the low-voltage current transformer shell is connected to the second primary-side wiring interface through the normally closed contact of the tenth AC contactor, and the first primary-side wiring interface of the low-voltage current transformer shell The wiring interface P1 is connected to the first primary side p1 of the current transformer through the first normally open contact of the tenth AC contactor, and the second primary side wiring interface of the low-voltage current transformer shell is connected through the tenth AC contactor The second normally open contact of the current transformer is connected to the second primary side p2 of the current transformer, and the first secondary side wiring interface of the low-voltage current transformer shell passes through the first normally open contact of the first AC contactor and the current transformer The first secondary side s1 of the low-voltage current transformer housing is connected to the first secondary side wiring interface of the low-voltage current transformer through the first normally closed contact of the first AC contactor and the second secondary side s2 of the current transformer. The second secondary side wiring interface of the transformer shell is connected to the second secondary side s2 of the current transformer through the second normally open contact of the first AC contactor, and the second secondary side wiring interface of the low-voltage current transformer shell The second normally closed contact of the first AC contactor is connected to the first secondary side s1 of the current transformer.

It also includes a current transformer simulation device for meter installation training. The current transformer simulation device for meter installation training includes a low-voltage current transformer shell, an eleventh AC contactor, and a current transformer located in the low-voltage current transformer shell. , the first primary-side wiring interface P1 on the low-voltage current transformer shell is connected to the second primary-side wiring interface P2 through the normally closed contact of the eleventh AC contactor, and the first primary-side wiring interface P2 on the low-voltage current transformer shell - The primary side wiring interface (P1) is connected to the first primary side (p1) of the current transformer through the first normally open contact of the eleventh AC contactor, and the second primary side of the low-voltage current transformer shell The side wiring interface is connected to the second primary side (p2) of the current transformer through the second normally open contact of the eleventh AC contactor, and the two secondary side wiring interfaces of the low-voltage current transformer shell are respectively connected to the current The two secondary sides (s1, s2) of the transformer are connected, and the eleventh AC contactor is electrically connected with a PLC controller, and the PLC controller is used to control the power on or off of the eleventh AC contactor.

The primary side of the current transformer simulation device for meter installation training and the primary side of the current transformer simulation device for fault training are connected in series between the two current output terminals of each phase of the virtual power supply.

The carrying end and outgoing line end of the junction box are designed with wired impedance faults.

The voltage inlet end of the junction box is connected to the voltage output end of the virtual power supply, the voltage outlet end of the junction box is connected to the voltage input end of the low-voltage electric energy meter, and the voltage inlet end of the junction box is connected to the voltage outlet end Between the intermediate relay and the resistor, the normally closed contact of the intermediate relay is connected in series between the incoming line end and the outgoing line end of the junction box, and the normally open contact of the intermediate relay is connected in parallel with its normally closed contact after being connected in series with the resistor. The current inlet end of the junction box is connected to the second secondary side wiring interface of the low-voltage current transformer shell, the current outlet end of the junction box is connected to the current input end of the low-voltage electric energy meter, and the current inlet end of the junction box is connected to the The AC contactor and resistor between the current outlet terminals, the normally closed contact of the AC contactor is connected in series between the incoming terminal and the outgoing terminal of the junction box, the normally open contact of the AC contactor is connected in series with the resistor and its normally closed contact Parallel connection, intermediate relay and AC contactor are connected with PLC controller.

The incoming line end of the virtual power supply is connected to the power supply incoming line end, and the outgoing line end of the virtual power supply is respectively connected to the low-voltage current transformer casing and the primary side wiring interface on the low-voltage voltage transformer casing.

An emergency stop button and an intermediate relay (J20) are connected in series between the inlet end of the virtual power supply and the power inlet end, and the intermediate relay (J20) is connected to the PLC controller.

By adopting the above scheme, the utility model has the following advantages: because the low-voltage electric energy metering device installation and test training device of the present utility model includes a PLC controller, a virtual power supply and a low-voltage electric energy meter, the current output terminal of the virtual power supply passes through The low-voltage current transformer simulation device is connected to the current input end of the low-voltage electric energy meter, and the voltage output end of the virtual power supply is connected to the voltage input end of the low-voltage electric energy meter. A junction box is provided between the voltage output end of the virtual power supply and the low-voltage electric energy meter. The low-voltage current transformer simulation device and the junction box have various fault simulations, which can set the secondary voltage drop measurement, current transformer polarity setting, phase sequence setting, etc., so that the utility model can meet the practical requirements of meter installation Training, current transformer test training, phase sequence negative pressure training, low-voltage electrical safety distance training and other related types of work and management personnel training, assessment and technical appraisal needs. Because this patent can satisfy the teaching method focusing on practical training, students can fully understand electrical safety knowledge, truly master electrical safety technology, and ensure the safety and health of students in their future work. Improve enterprise efficiency and improve the safety and stable operation level of power grid.

This training device is based on various basic knowledge of electrical safety, and is developed by applying current advanced electrical and electronic technologies. It is a training device that integrates training and learning, theoretical verification, practical operation, and assessment.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Description of drawings

Fig. 1 is the main circuit diagram of installation and test training device of low-voltage electric energy metering device of the present utility model;

Figure 1a is an enlarged view of part P of Figure 1;

Fig. 2 is the wiring diagram of the current transformer simulation device for U-phase fault training and the current transformer simulation device for meter installation training of the present invention;

Fig. 3 is the schematic wiring diagram of the current transformer simulation device for V-phase fault training and the current transformer simulation device for meter installation training of the present invention;

Fig. 4 is the wiring schematic diagram of the current transformer simulation device for W-phase fault training and the current transformer simulation device for meter installation training of the utility model;

Fig. 5 is the schematic diagram of the fault type training current transformer simulation device of the present utility model;

Fig. 6 is a schematic diagram of a current transformer simulation device for meter-fitting training of the present utility model;

Figure 7 is a schematic diagram of the internal wiring of the junction box of the present invention;

Fig. 8 is a schematic diagram of virtual power supply control of the present invention;

Fig. 9 is a schematic diagram of PLC controller control of the present invention.

Detailed ways

Referring to Fig. 1 to Fig. 9, a low-voltage electric energy metering device installation and testing training device includes a PLC controller, a virtual power supply and a low-voltage electric energy meter. The virtual power supply of this embodiment adopts the ZX5050 three-phase program-controlled precision test power supply. A current transformer simulation device for fault training is provided between the current output terminals of each phase of the virtual power supply and the current input terminals of the low-voltage electric energy meter. The current transformer simulation device for fault training is set on the row training surface. A junction box with impedance fault simulation function is provided between the voltage output terminal of the virtual power supply and the voltage input terminal of the low-voltage electric energy meter, and the PLC controller is used to control the current transformer simulation device for fault training and has impedance The junction box of the fault simulation function performs fault setting. This device can be installed on a cabinet.

The current transformer simulation device for fault training is provided with a polarity setting fault point. The current transformer simulation device for fault training includes a low-voltage current transformer shell, and the low-voltage current transformer shell is provided with a current transformer, a tenth AC contactor (JK10), and a first AC contactor (JK1). The current transformer is a low-voltage current transformer, which is matched with the shell of the low-voltage current transformer. The first primary-side wiring interface on the low-voltage current transformer shell is connected to the second primary-side wiring interface through the normally closed contact of the tenth AC contactor, and the first primary-side wiring interface of the low-voltage current transformer shell The wiring interface P1 is connected to the first primary side p1 of the current transformer through the first normally open contact of the tenth AC contactor, and the second primary side wiring interface of the low-voltage current transformer shell is connected through the tenth AC contactor The second normally open contact of the current transformer is connected to the second primary side p2 of the current transformer, and the first secondary side wiring interface of the low-voltage current transformer shell passes through the first normally open contact of the first AC contactor and the current transformer The first secondary side s1 of the low-voltage current transformer housing is connected to the first secondary side wiring interface of the low-voltage current transformer through the first normally closed contact of the first AC contactor and the second secondary side s2 of the current transformer. The second secondary side wiring interface of the transformer shell is connected to the second secondary side s2 of the current transformer through the second normally open contact of the first AC contactor, and the second secondary side wiring interface of the low-voltage current transformer shell The second normally closed contact of the first AC contactor is connected to the first secondary side s1 of the current transformer. The current transformer, the tenth AC contactor (JK10), and the first AC contactor (JK1) are all arranged in the low-voltage current transformer shell, and the effect is the best.

This training device also includes a current transformer simulation device for training on meter installation, which is set on the training surface of meter installation. The current transformer simulation device for meter installation training includes a low-voltage current transformer shell, an eleventh AC contactor, and a current transformer located in the low-voltage current transformer shell. The first one on the low-voltage current transformer shell The secondary side wiring interface P1 is connected to the second primary side wiring interface P2 through the normally closed contact of the eleventh AC contactor, and the first primary side wiring interface (P1) of the low-voltage current transformer shell is connected through the eleventh The first normally open contact of the AC contactor is connected to the first primary side (p1) of the current transformer, and the second primary side wiring interface of the low-voltage current transformer shell is connected to the second primary side of the eleventh AC contactor. The normally open contact is connected to the second primary side (p2) of the current transformer, and the two secondary side wiring interfaces of the low-voltage current transformer shell are respectively connected to the two secondary sides (s1, s2) of the current transformer connection, the eleventh AC contactor is electrically connected to the PLC controller, and the PLC controller is used to control the power on or off of the eleventh AC contactor. Both the current transformer and the eleventh AC contactor are arranged in the shell of the low-voltage current transformer, and the effect is the best.

The primary side of the current transformer simulation device for meter installation training and the primary side of the current transformer simulation device for fault training are connected in series between the two current output terminals of each phase of the virtual power supply.

The positive output terminal of phase A current of the virtual power supply is connected to the first primary side wiring interface of the first fault type training current transformer simulation device TA1, and the first fault type training current transformer simulation device TA1 The second primary-side wiring interface is connected to the first primary-side wiring interface of the first meter-installation training current transformer simulation device TA4, and the second primary-side wiring of the first meter-installation training current transformer simulation device TA4 The interface is connected to the A-phase current negative output terminal of the virtual power supply, and the secondary-side wiring interface of the current transformer simulation device TA1 for the first fault training is connected to the low-voltage electric energy meter through the junction box. The B-phase current positive output terminal of the virtual power supply is connected to the first primary side wiring interface of the second fault type training current transformer simulation device TA2, and the first fault type training current transformer simulation device TA2 The second primary-side wiring interface is connected to the first primary-side wiring interface of the second meter-installation training current transformer simulation device TA5, and the second primary-side wiring of the second meter-installation training current transformer simulation device TA5 The interface is connected to the B-phase current negative output terminal of the virtual power supply, and the secondary-side wiring interface of the current transformer simulation device TA2 for the second fault type training is connected to the low-voltage electric energy meter through the junction box. The C-phase current positive output end of the virtual power supply is connected to the first primary side wiring interface of the third fault type training current transformer simulation device TA3, and the third fault type training current transformer simulation device TA3 is connected to the first primary side connection interface. The second primary-side wiring interface is connected to the first primary-side wiring interface of the third meter-installation training current transformer simulation device TA6, and the second primary-side wiring of the third meter-installation training current transformer simulation device TA6 The interface is connected to the C-phase current negative output terminal of the virtual power supply, and the secondary side wiring interface of the current transformer simulation device TA3 for the third fault type training is connected to the low-voltage electric energy meter through the junction box.

The electric energy metering installation and testing training device has training for rowing and meter installation. The training device is provided with a watch-fitting training surface and a row-passing training surface. The reason for setting up the training surface of the exhaust class is that the teacher needs to teach the students how to troubleshoot and how to connect the equipment. The training surface for meter installation is set up because the teacher teaches the student union, and students need to do wiring on this surface. The fault-type training surface needs to train students on the possible wrong connections in various meter installation wiring. The wires in the meter-installation training surface are all connected by the students themselves, and there is no need for faults. TA1, TA2, and TA3 are the current transformer simulation devices for fault training on the discharge training surface, and TA4, TA5 and TA6 are the current transformer simulation devices for the meter installation training on the meter installation training surface. After the A-phase current of the virtual power supply passes through P1 of TA1, it is connected to P1 of TA3 by P2 of TA1, and then returned to the virtual power supply by P2 of TA3, and the secondary measurement of TA1 is connected to the junction box, and B of the virtual power supply , C phase and A phase are the same principle.

After modifying the low-voltage current transformer, it can make the low-voltage current transformer conform to reality. After modifying the inside of the low-voltage current transformer, the functions required by this training device can be realized. After the low-voltage current transformer is tested once and P1 passes through the normally open and normally closed points of the JK AC contactor, the low-voltage current transformer can be turned on without opening the AC contactor. The current transformer P1 and P2 are connected, but the low-voltage current transformer has no current in the secondary measurement. After the AC contactor JK is turned on, the low-voltage current transformer P1 and P2 can be connected, and the low-voltage current transformer has a current output in the secondary measurement.

Referring to FIG. 7 , the terminal and outgoing terminal of the junction box are designed with wired impedance faults. The U, V, W, and N phase voltage terminals of the virtual power supply are respectively correspondingly connected to a busbar, and the busbar is respectively provided with a U-phase current transformer, a V-phase current transformer, and a W-phase current transformer. The voltage input terminal of the junction box is connected with the voltage output terminal of the virtual power supply. The voltage inlet terminals of the junction box are respectively connected to the primary side p1 of the U-phase current transformer, the V-phase current transformer, and the W-phase current transformer. The voltage outlet terminal of the junction box is connected with the voltage input terminal of the low-voltage electric energy meter. An intermediate relay and a resistor between the voltage incoming terminal and the voltage outgoing terminal of the junction box, the normally closed contact of the intermediate relay is connected in series between the incoming terminal and the outgoing terminal of the junction box, the normally open contact of the intermediate relay and the resistor Connect in parallel with its normally closed contact after series connection. The current inlet end of the junction box is connected to the second secondary side wiring interface of the low-voltage current transformer shell. The current inlet terminals of the junction box are respectively connected to the secondary side of the U-phase current transformer, the V-phase current transformer, and the W-phase current transformer, and the U-phase current transformer, the V-phase current transformer, and the W-phase current transformer The secondary side of the transformer is correspondingly connected to the low-voltage current transformer simulation device. The current outlet end of the junction box is connected to the current input end of the low-voltage electric energy meter, and the AC contactor and the resistor are connected in series between the current inlet end and the current outlet end of the junction box, and the normally closed contacts of the AC contactor are connected in series. Between the incoming line end and the outgoing line end of the junction box, the normally open contact of the AC contactor is connected in parallel with the normally closed contact after being connected in series with the resistor, and the intermediate relay and the AC contactor are connected to the PLC controller.

According to the design of the wired impedance fault of the incoming and outgoing terminals of the junction box, the junction box passes through the first relay between the first incoming and outgoing terminals, and passes through the intermediate relay when the incoming and outgoing terminals are overvoltage. The current passes through the AC contactor in the middle, and the intermediate relay passing through it or the normally open contact of the AC contactor is connected in series with the first resistor, which is a wired resistive fault.

Since the power supply of this device is powered by a virtual power supply, the current and voltage of the virtual power supply are separated. In order to realize the simulated reality, the copper plate (wire) must be modified.

The modification principle of the bronze medal: In order to combine the voltage and current output by the virtual power supply, and simulate the output voltage and current of a line in reality, the modification of the bronze medal is to add two bronze medals of the same size together. The bronze medals that are put together cannot communicate, so that although the current and voltage of the training device go together, they cannot interfere with each other.

Processing: Add insulating gold paper between two bronze medals of the same size, and then press the two bronze medals together through fine processing, so that they cannot fall off and cannot communicate with each other at the same time.

The start and stop of the virtual power supply is controlled by a programmable logic controller (PLC), and there is an emergency stop protection power supply in the middle. Referring to FIG. 8 , the inlet terminal of the virtual power supply is connected to the power supply inlet terminal, and the outlet terminal of the virtual power supply is respectively connected to the low-voltage current transformer housing and the primary-side wiring interface on the low-voltage voltage transformer housing. An emergency stop button and an intermediate relay (J20) are connected in series between the inlet end of the virtual power supply and the power inlet end, and the intermediate relay (J20) is connected to the PLC controller.

The start and stop of the virtual power supply is controlled by connecting the emergency stop in series with the normally open point of J20 (intermediate relay) in the middle of the power inlet terminal of the device, and then connected to the inlet terminal of the virtual power supply, so that you can meet the training device In the abnormal state, you can press the emergency stop to turn off the virtual power supply to prevent damage to the virtual power supply. J20 (intermediate relay) is connected in series and the programmer (PLC) controls the start and stop of J20, so that the training can control the power supply of the device on the computer. The power input terminal of the device is connected to an external power supply.

In Figure 9, PLC HOsT represents the PLC programmer host, and PLC CTTp represents the PLC programmer auxiliary module. The PLC programmer controls the coil of the intermediate relay J1-J19 to energize or de-energize, and the intermediate relay J5-J19 controls the contactor JK1- The JK15 coil is energized or de-energized. In the communication between the PLC programmer and the computer, the computer can control the running state of the equipment, which provides convenience for the training.

The faults in this device have secondary voltage drop settings, which are respectively the voltage drop of the voltage line and the voltage drop of the current line.

Voltage line: With or without voltage drop on the voltage line, U phase, V phase, W phase, N, you can choose the voltage drop setting in which phase you need according to the requirements, and select None when no voltage drop is required for each phase, indicating is the no pressure drop setting.

Current line: with or without voltage drop on the current line, Ia in, Ia out, Ib in, Ib out, Ic in, Ic out, you can choose the voltage drop setting in which phase you need according to requirements, when no voltage is required for each phase Select None when dropping, which means no pressure drop setting.

The polarity setting of the current transformer is positive polarity and negative polarity respectively.

Positive polarity: U-positive, V-positive, W-positive, when the low-voltage electric energy metering installation-test training screen needs to operate normally, choose this.

Negative polarity: U-negative, V-negative, W-negative, when a negative polarity test is required, set the required polarity according to the requirements.

Phase sequence setting, in the phase sequence setting, there are three-phase three-wire positive phase sequence, three-phase three-wire reverse phase sequence, three-phase four-wire positive phase sequence, three-phase four-wire reverse phase sequence, according to the requirements set by virtual power supply phase sequence.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. The intermediate relay and the AC contactor can be replaced by switches with the same function, and the setting form of the fault is not limited to the above-mentioned embodiment. In the case of realizing the same function (secondary voltage drop setting, current transformer polarity setting, phase sequence setting, etc.), the specific connection mode can be simply modified. Obviously, those skilled in the art can understand the utility model Various changes and modifications can be made without departing from the spirit and scope of the invention. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (9)

1. a low voltage electric energy measure device is installed and test training device, it is characterized in that: comprise PLC, virtual power supply and low-voltage electric energy metering table, failure classes training Current Transformer analogue means is provided with between the current output terminal of described virtual power supply and the current input terminal of low-voltage electric energy metering table, the terminal box with impedance fault analog functuion is provided with between the voltage output end of described virtual power supply and the voltage input end of low-voltage electric energy metering table, described PLC carries out fault verification for the terminal box controlling failure classes training Current Transformer analogue means and have an impedance fault analog functuion.

2. low voltage electric energy measure device according to claim 1 is installed and test training device, it is characterized in that: be provided with polarity set trouble spot in described failure classes training Current Transformer analogue means.

3. low voltage electric energy measure device according to claim 2 is installed and test training device, it is characterized in that: described failure classes training Current Transformer analogue means comprises low-voltage current mutual inductor shell, current transformer is provided with in described low-voltage current mutual inductor shell, tenth A.C. contactor (JK10), first A.C. contactor (JK1), the first primary side wiring interface on described low-voltage current mutual inductor shell is connected with the second primary side wiring interface through the normally closed contact of the tenth A.C. contactor, first primary side wiring interface (P1) of described low-voltage current mutual inductor shell is connected with first primary side (p1) of current transformer through the first normally opened contact of the tenth A.C. contactor, second primary side wiring interface of described low-voltage current mutual inductor shell is connected with second primary side (p2) of current transformer through the second normally opened contact of the tenth A.C. contactor, first secondary side wiring interface of low-voltage current mutual inductor shell is connected with first secondary side (s1) of current transformer through the first normally opened contact of the first A.C. contactor, first secondary side wiring interface of low-voltage current mutual inductor shell is connected with second secondary side (s2) of current transformer through the first normally closed contact of the first A.C. contactor, second secondary side wiring interface of low-voltage current mutual inductor shell is connected with second secondary side (s2) of current transformer through the second normally opened contact of the first A.C. contactor, second secondary side wiring interface of low-voltage current mutual inductor shell is connected with first secondary side (s1) of current transformer through the second normally closed contact of the first A.C. contactor.

4. low voltage electric energy measure device according to claim 1 is installed and test training device, it is characterized in that: also comprise dress table class training Current Transformer analogue means, described dress table class training Current Transformer analogue means comprises low-voltage current mutual inductor shell, 11 A.C. contactor (JK11) and be positioned at the current transformer of low-voltage current mutual inductor shell, the first primary side wiring interface (P1) on described low-voltage current mutual inductor shell is connected with the second primary side wiring interface P2 through the normally closed contact of the 11 A.C. contactor, first primary side wiring interface (P1) of described low-voltage current mutual inductor shell is connected with first primary side (p1) of current transformer through the first normally opened contact of the 11 A.C. contactor, second primary side wiring interface of described low-voltage current mutual inductor shell is connected with second primary side (p2) of current transformer through the second normally opened contact of the 11 A.C. contactor, two secondary side wiring interfaces of described low-voltage current mutual inductor shell respectively with two secondary side (s1 of current transformer, s2) connect, 11 A.C. contactor is electrically connected with PLC, described PLC is for controlling energising or the power-off of the 11 A.C. contactor.

5. low voltage electric energy measure device according to claim 4 is installed and test training device, it is characterized in that: the primary side of described dress table class training Current Transformer analogue means is connected between two current output terminals of each phase of virtual power supply with the primary side of failure classes training Current Transformer analogue means.

6. low voltage electric energy measure device according to claim 1 is installed and test training device, it is characterized in that: the carrying out end of described terminal box designs wired impedance fault with leading-out terminal.

7. low voltage electric energy measure device according to claim 6 is installed and test training device, it is characterized in that: the voltage end of incoming cables of described terminal box is connected with the voltage output end of virtual power supply, the voltage leading-out terminal of described terminal box is connected with the voltage input end of low-voltage electric energy metering table, auxiliary reclay between the voltage end of incoming cables of described terminal box and voltage leading-out terminal, resistance, the normally closed contact of auxiliary reclay is connected between the end of incoming cables of terminal box and leading-out terminal, the normally opened contact of auxiliary reclay is in series with a resistor rear in parallel with its normally closed contact, the electric current end of incoming cables of described terminal box is connected with the second secondary side wiring interface of low-voltage current mutual inductor shell, the current outlet end of described terminal box is connected with the current input terminal of low-voltage electric energy metering table, A.C. contactor between the electric current end of incoming cables of described terminal box and current outlet end, resistance, the normally closed contact of A.C. contactor is connected between the end of incoming cables of terminal box and leading-out terminal, the normally opened contact of A.C. contactor is in series with a resistor rear in parallel with its normally closed contact, auxiliary reclay, A.C. contactor is all connected with PLC.

8. low voltage electric energy measure device according to claim 1 is installed and test training device, it is characterized in that: the end of incoming cables of described virtual power supply is connected with power inleting terminal, the leading-out terminal of virtual power supply is connected with the primary side wiring interface on low-voltage current mutual inductor shell, low voltage voltage transformer casing respectively.

9. low voltage electric energy measure device according to claim 8 is installed and test training device, it is characterized in that: be in series with scram button and auxiliary reclay (J20) between the end of incoming cables of described virtual power supply and power inleting terminal, auxiliary reclay (J20) is connected with PLC.