CN111781552A - Relay parallel device, current transformer range automatic conversion device and method - Google Patents

Abstract

The invention provides a current transformer range automatic conversion device. The power supply area provides high voltage and enters the high voltage area main control. The low voltage area main control CPU receives the current transformation ratio and voltage transformation ratio signals sent by the computer, and is received by the high voltage area CPU through the communication optical fiber; After receiving the signal, the main control CPU in the high-voltage area selects the required current switching output by analyzing the signal, and controls the high voltage to enter the current primary circuit and the voltage primary circuit; in the current primary circuit, it drives the corresponding current according to the different current transformation ratio signals received. Switch the output terminal, enter the current secondary circuit through the current transformer to complete the current switching, and the voltage primary circuit receives the voltage transformation ratio signal, and enters the voltage secondary circuit through the voltage transformer to complete the voltage switching. By adopting this scheme, the labor intensity is greatly reduced, and the work efficiency is effectively improved.

Description

Relay parallel device, current transformer range automatic conversion device and method

technical field

The invention belongs to the technical field of high-voltage and high-current testing under the state of simulated power grid, and particularly relates to a relay parallel device, a current transformer range automatic conversion device and a method.

Background technique

Distribution network high-voltage metering equipment is extremely widely used in power generation, transmission, distribution and other fields of power systems, with a large number and wide coverage. State detection, there are some defects in this state detection, the first is the influence of high-voltage leakage current on the error of the current transformer, and the second is the influence of the error between adjacent phases. Although some places also adopt the three-phase high-voltage state detection of simulating working conditions, because the tested and standard equipment are both in a high-voltage state, the switching of the ratio of the standard transformer is more troublesome, and continuous operation under high-voltage state cannot be realized. . Moreover, manually changing the ratio can easily lead to inaccurate measurement caused by human factors such as wiring errors and loop impedance deviation. Manual wiring and switching ratios are complicated, labor-intensive, and low-efficiency work, which cannot meet the status quo.

With the rapid development of my country's industry and economy and the continuous improvement of people's living standards, electricity has entered the market as a special commodity. Therefore, the reform of the power system and the establishment of the power market have arisen accordingly. For the management of high-voltage metering equipment in the distribution network, the State Grid Corporation has also launched a series of technical solutions, and some of the original traditional test methods will be gradually eliminated. It is under the above background that it is very necessary to solve the above problems, which is of great significance to the acceptance, operation performance detection and measurement verification of high-voltage metering equipment used in power generation, transmission, distribution and other fields of power systems. .

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a relay parallel device, a current transformer range automatic conversion device and method, and the present invention is specially used for the simulated working conditions of the distribution network high-voltage metering equipment (ie three-phase high voltage, three-phase high current state). The performance testing and measurement verification are carried out in the following aspects. The application of the invention covers the test fields of combined transformers, electronic transformers, high-voltage electric energy meters, primary and secondary fusion technology, and high-voltage cost control. It can also be conveniently used for various equipment in The stability test under high voltage and high current state greatly reduces the labor intensity and effectively improves the work efficiency during the automatic conversion of the standard current transformer range running under the high voltage state.

The technical means of the present invention are as follows: a relay parallel device, comprising a base plate and a current switching device;

the current switching device includes a plurality of relays;

Each of the relays is provided with a current common terminal, a current output terminal and a control terminal, and each of the relays is fixedly installed on the base plate through the control terminal;

Each of the current common terminals is connected in series to form a relay common output terminal;

The relay includes relays with various current outputs; the current output terminals of the relays with the same current output are connected in series to form the current switching output terminals of the current.

During the specific operation of this scheme, multiple relays are fixedly installed on the base plate through the control terminal. The relays are provided with a current common terminal, a current output terminal and a control terminal. The control terminal of each relay can receive signals and control the operation of each relay. . The current common terminals of each relay are connected in parallel to form a relay common output terminal, and the current is input from the relay common output terminal. The relay includes a variety of current output relays. The current output terminals of the same current output relay are connected in parallel to form the current switching output terminal of this current. Different numbers of relays can output different current switching output terminals formed by the current output terminals connected in parallel. The current we need.

Further, the current switching output terminal includes a current switching output terminal A, a current switching output terminal B, a current switching output terminal C, a current switching output terminal D and a current switching output terminal E;

The primary current of the current switching output terminal A is 250A-600A switching output terminal;

The primary current of the current switching output terminal B is 100A-200A switching output terminal;

The primary current of the current switching output terminal C is 40A-75A switching output terminal;

The primary current of the current switching output terminal D is 12.5A～30A switching output terminal;

The primary current of the current switching output terminal E is the switching output terminal of 5A˜10A.

During the specific operation of this scheme, different numbers of relays form different current outputs. Among them, the current output terminals of 8 relays are connected in parallel to form the current switching output terminal A. The primary output current is 250A~600A, and the current output of 5 relays is The current switching output terminal B formed by the parallel connection of the terminals, the primary output current is 100A~200A, and the current switching output terminal C formed by the parallel current output terminals of two relays, the primary output current is 40A~75A, and the current output terminal formed by one relay current output terminal is 40A~75A. The current switching output terminal D, the primary output current is 12.5A ~ 30A, the current switching output terminal F formed by a relay current output terminal, the primary output current is 5A ~ 10A, when we need to get a specific current, switch to the one we need. Current switching output.

Further, the current switching output terminal further includes a current switching output terminal F and a current switching output terminal G as backup current switching output terminals.

During the specific operation of this solution, the standby current switching output terminal F and the current switching output terminal G are set, and currents other than the above values can be obtained.

Further, in order to make the obtained current value wider, it is set as follows: the current switching output terminal F and the current switching output terminal G are multiple.

Further, the magnetic latching relay has sensitive action, good reliability, good shock resistance and vibration resistance, dust-proof packaging, and dual-coil control. The rated allowable passing current of a single contact can reach 100A, and the contact resistance is small. If two are used in parallel in the loop, it can increase the overcurrent capability. It is set as follows: each of the relays is a large-capacity magnetic latching relay.

Further, the current transformer range automatic conversion device includes a power supply area, a high-voltage area main control and a low-voltage area main control, the power supply area provides high voltage to the high-voltage area main control, and the high-voltage area main control is connected through an optical fiber to the low-voltage area main control. Interoperate switching commands and battery status, including switching control systems;

The conversion control system includes a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a transformer calibrator;

The high-voltage area mainly controls a parallel current primary circuit and a voltage primary circuit, the current primary circuit is connected to the current secondary circuit through a current transformer, and the voltage primary circuit is connected to the voltage secondary circuit through a voltage transformer;

The transformer calibrator is connected in parallel with a current secondary circuit and a voltage secondary circuit;

The low-voltage area is mainly controlled by a parallel current secondary circuit and a voltage secondary circuit;

The current primary circuit adopts the relay parallel device according to any one of claims 1 to 5 .

In the specific operation of this scheme, the main control of the low-voltage area transmits signals to the main control of the high-voltage area through the communication optical fiber, and communicates switching commands and battery status. After the signal is analyzed, the signal is analyzed and the current and voltage are input into the current loop and the voltage loop respectively. The current primary loop converts the current through the current transformer and the current secondary loop, and the voltage primary loop converts the voltage through the voltage transformer and the voltage secondary loop. Among them, the relay parallel device is located in the current primary circuit, the signal from the low-voltage area is the current transformation ratio and voltage transformation ratio we need, and the high-voltage area main control controls the operation of switching the different current switching output terminals in the relay parallel device by analyzing the signal. get the required current. The main control in the low-voltage area can obtain the current and voltage values output by the current secondary circuit and the voltage secondary circuit. The transformer calibrator can automatically test the entire current and voltage loop to ensure safe operation.

Further, the power supply area includes an air base, a battery measurement circuit and a power supply circuit.

In the specific operation of this scheme, the power supply area includes the air base, the battery measurement circuit and the power supply circuit. The power supply area is powered by the lithium battery. The external charging voltage of the air base can charge the lithium battery, and the battery measurement circuit can test the power of the lithium battery at any time. And control the charging of the air base, and the power supply circuit is connected to the main control of the high-voltage area and supplies power to it.

Further, the main control of the high-voltage area includes a main control CPU, a high-voltage area and an optical fiber two-way communication loop, and the main control CPU controls the high-voltage area and the optical fiber two-way communication loop;

The high-voltage area is connected with a current primary circuit and a voltage primary circuit in parallel, and the optical fiber two-way communication circuit is connected to the low-voltage area master through an optical fiber to communicate switching commands and battery status.

During the specific operation of this scheme, the main control of the high-voltage area is connected with the main control of the low-voltage area through the communication optical fiber to form a two-way communication loop of optical fiber. The main control CPU can receive the transformation ratio signal of the main control in the low voltage area. The main control CPU inputs the high voltage into the current primary circuit and the voltage primary circuit through the high voltage area. The main control CPU analyzes the signal to control the switching relays. Toggle output operation.

Further, the main control of the low-voltage area includes a main control CPU, a low-voltage area, an optical fiber two-way communication loop, an operation panel and a computer communication port, and the main control CPU controls the low-voltage area, the optical fiber two-way communication loop, the operation panel and the computer communication port;

The low-voltage area is connected with a current secondary circuit and a voltage secondary circuit in parallel, and the optical fiber bidirectional communication circuit is connected to the optical fiber bidirectional communication circuit in the high-voltage area through an optical fiber to communicate switching commands and battery status.

When this scheme is in operation, the main control CPU in the main control of the low-voltage area gets the signal from the computer communication port, analyzes it into the current transformation ratio and voltage transformation ratio we need, and transmits the transformation ratio signal to the high-voltage area master through the communication optical fiber. The operation panel in the main control of the low-voltage area can control the operation of the entire control main control CPU, and display the current and voltage values. The main control CPU connects the current secondary circuit and the voltage secondary circuit through the low-voltage area, and can obtain the current and voltage values generated by the current secondary circuit and the voltage secondary circuit.

Further, the relay parallel device, the current transformer range automatic conversion device and method include the following steps;

When this scheme is in operation, the battery supplies power to the single-chip microcomputer, and can also supply power through the charger. The charger is an external device and is manually connected to the battery through aerial plug. The indicator light indicates that when the undervoltage indicator light is on, it indicates that charging is required. The battery charging circuit adopts a small door self-locking device. When the charging door is opened and switched to the charging mode, all the control power of the device is automatically turned off, and the device cannot work; only after the charging is completed, the device can return to normal working state when switched to work. The switching of the primary and secondary loops of this scheme is controlled by the input command of the single-chip microcomputer, and the information obtained after switching can be fed back to the single-chip microcomputer. The specific switching of the primary and secondary loops is as follows:

S1: The power supply area provides high voltage, enters the high voltage area master control, the low voltage area master control CPU receives the current transformation ratio and voltage transformation ratio signals sent by the computer, and is received by the high voltage area CPU through the communication optical fiber;

S2: After receiving the signal, the main control CPU in the high voltage area selects the required current switching output by analyzing the signal, and controls the high voltage to enter the current primary circuit and the voltage primary circuit;

S3: In the current primary loop, the corresponding current switching output terminals are driven according to the received different current transformation ratio signals, and the current switching is completed by entering the current secondary loop through the current transformer. The voltage primary loop receives the voltage transformation ratio signal, and passes the voltage transformer. The device enters the voltage secondary circuit to complete the voltage switching.

The present invention has the following beneficial effects:

The invention provides a relay parallel device, a current transformer range automatic conversion device and method, and the invention is specially used for the performance testing of distribution network high-voltage metering equipment under simulated working conditions (ie, three-phase high voltage, three-phase high current state). Metrological verification, the application of the present invention covers the test fields of combined transformer, electronic transformer, high-voltage electric energy meter, primary and secondary fusion technology, high-voltage cost control, etc., and can also be conveniently used for various equipment in the state of high voltage and high current During the automatic conversion of the standard current transformer range running under high voltage, the labor intensity is greatly reduced and the work efficiency is effectively improved.

Description of drawings

Fig. 1 is the connection schematic diagram of the control automatic loop switching process provided by the present invention;

2 is a schematic structural diagram of a relay provided by the present invention;

3 is a schematic structural diagram of a relay parallel device provided by the present invention;

Fig. 4 is the circuit schematic diagram of the whole single chip device provided by the present invention;

Fig. 5 is the connection schematic diagram of the current primary loop and the current secondary loop provided by the present invention;

Fig. 6 is the connection schematic diagram of the voltage primary circuit and the voltage secondary circuit provided by the present invention;

7 is a schematic diagram of a power supply area of a switching process provided by the present invention;

8 is a schematic structural diagram of a high-voltage zone master provided by the present invention;

9 is a schematic structural diagram of a bottom pressure zone master provided by the present invention;

FIG. 10 is an electrical schematic diagram of one-time switching of the automatic switching device provided by the present invention.

The reference signs in the figure are: 1, the relay common output terminal, 2, the current switching output terminal A, 3, the current switching output terminal B, 4, the current switching output terminal C, 5, the current switching output terminal D, 6 , Current switching output terminal E, 7, Current switching output terminal F, 8, Current switching output terminal G, 9, Bottom plate, 10, Relay, 11, Current common terminal, 12, Current output terminal, 13, Control terminal.

specific embodiment

The present invention is illustrated in detail by the following examples.

Embodiment: As shown in FIG. 1 to FIG. 10, a relay parallel device includes a base plate 9 and a current switching device;

The current switching device includes a plurality of relays 10;

Each of the relays 10 is provided with a current common terminal 11, a current output terminal 12 and a control terminal 13, and each of the relays 10 is fixedly installed on the base plate 9 through the control terminal 13;

Each of the current common terminals 11 is connected in series to form a relay common output terminal 1;

The relay 10 includes multiple current output relays 10; the current output terminals 12 of the same current output relay 10 are connected in series to form the current switching output terminals of the current.

In this embodiment, a plurality of relays 10 are fixedly installed on the base plate 9 through the control terminal 13 . The relay 10 is provided with a current common terminal 11 , a current output terminal 12 and a control terminal 13 , and the control terminal 13 of each relay 10 can receive signal that controls the operation of each relay 10 . The current common terminal 11 of each relay 10 is connected in parallel to form the relay common output terminal 1, and the current is input from the relay common output terminal 1. Each relay 10 can receive current through parallel connection and increase the contact overcurrent capability. The relay 10 includes relays 10 with various current outputs. The current output terminals 12 of the relays 10 with the same current output are connected in parallel to form the current switching output terminals of the current. Different numbers of relays 10 are connected in parallel through the current output terminals 12. terminal, can output different currents we need.

In this embodiment, different numbers of relays 10 form different current outputs, among which the current output terminals 12 of 8 relays 10 are connected in parallel to form the current switching output terminal A2, and the primary output current is 250A-600A, among which 5 relays 10 The current switching output terminal B3 formed by the parallel connection of the current output terminals 12 of the relay 10 has a primary output current of 100A to 200A, and the current switching output terminal C4 formed by the parallel connection of the current output terminals 12 of the two relays 10 has a primary output current of 40A to 75A. The current switching output terminal D5 formed by the current output terminal 12 of the relay 10 has a primary output current of 12.5A~30A, and the current switching output terminal F6 formed by the current output terminal 12 of the relay 10 has a primary output current of 5A~10A. When a specific current is required, switch to the current switching output that we need. It is set as follows: the current switching output terminal includes a current switching output terminal A2, a current switching output terminal B3, a current switching output terminal C4, a current switching output terminal D5 and a current switching output terminal E6; the primary current of the current switching output terminal A2 250A～600A switching output terminal; the primary current of the current switching output terminal B3 is 100A～200A switching output terminal; the primary current of the current switching output terminal C4 is 40A～75A switching output terminal; the current switching output terminal The primary current of D5 is the switching output terminal of 12.5A-30A; the primary current of the current switching output terminal E6 is the switching output terminal of 5A-10A.

In this embodiment, the standby current switching output terminal F7 and the current switching output terminal G8 are set to obtain currents of other values except the above. It is set as follows: the current switching output terminal further includes the current switching output terminal F7 and the current switching output terminal. The output terminal G8 is used as a backup current switching output terminal.

In this embodiment, in order to make the obtained current value wider, it is set as follows: the current switching output terminal F7 and the current switching output terminal G8 are multiple.

In this embodiment, the magnetic latching relay 10 has sensitive action, good reliability, good shock resistance and vibration resistance, dust-proof packaging, and dual-coil control. The rated allowable passing current of a single contact can reach 100A, and the contact resistance is small. If two are used in parallel in the loop, the overcurrent capability can be increased.

Further, the current transformer range automatic conversion device includes a power supply area, a high-voltage area main control and a low-voltage area main control, the power supply area provides high voltage to the high-voltage area main control, and the high-voltage area main control is connected through an optical fiber to the low-voltage area main control. Interoperate switching commands and battery status, including switching control systems;

The conversion control system includes a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a transformer calibrator;

The high-voltage area mainly controls a parallel current primary circuit and a voltage primary circuit, the current primary circuit is connected to the current secondary circuit through a current transformer, and the voltage primary circuit is connected to the voltage secondary circuit through a voltage transformer;

The transformer calibrator is connected in parallel with a current secondary circuit and a voltage secondary circuit;

The low-voltage area is mainly controlled by a parallel current secondary circuit and a voltage secondary circuit;

The current primary circuit adopts the relay parallel device according to any one of claims 1 to 5 .

In this embodiment, the main controller of the low-voltage area transmits signals to the main controller of the high-voltage area through the communication optical fiber, and communicates switching commands and battery status. Then, analyze the signal and input the current and voltage into the current loop and the voltage loop respectively, the current primary loop converts the current through the current transformer and the current secondary loop, and the voltage primary loop converts the voltage through the voltage transformer and the voltage secondary loop. Among them, the relay parallel device is located in the primary current circuit, the signal from the low-voltage area is the current transformation ratio and voltage transformation ratio we need, and the high-voltage area master control controls the operation of switching the different current switching output terminals in the relay parallel device by analyzing the signal. get the required current. The main control in the low-voltage area can obtain the current and voltage values output by the current secondary circuit and the voltage secondary circuit. The transformer calibrator can automatically test the entire current and voltage loop to ensure safe operation.

In this embodiment, the power supply area includes an air base, a battery measurement circuit and a power supply circuit, the power supply area is powered by a lithium battery, the external charging voltage of the air base can charge the lithium battery, and the battery measurement circuit can test the power of the lithium battery at any time, and The air base is controlled to be charged, and the power supply circuit is connected to the main control of the high-voltage area and supplies power to it.

In this embodiment, the main control in the high-voltage area is connected with the main control in the low-voltage area through a communication optical fiber to form a two-way optical fiber communication loop. The main control CPU can receive the transformation ratio signal of the main control in the low-voltage area. The main control CPU inputs the high voltage into the current primary circuit and the voltage primary circuit through the high-voltage area. The main control CPU analyzes the signal to control the switching relays. The output runs. It is set as follows: the main control of the high-voltage area includes a main control CPU, a high-voltage area and an optical fiber two-way communication circuit, and the main control CPU controls the high-voltage area and the optical fiber two-way communication circuit; the high-voltage area is connected in parallel with a current primary circuit and a voltage primary circuit, so The optical fiber two-way communication loop is connected to the main control of the low-voltage area through the optical fiber to communicate switching commands and battery status.

In this embodiment, the main control CPU in the low-voltage area main control obtains the signal from the computer communication port, parses it into the current transformation ratio and voltage transformation ratio we need, and transmits the transformation ratio signal to the high-voltage area main control through the communication optical fiber. The operation panel in the main control of the low-voltage area can control the operation of the entire control main control CPU, and display the current and voltage values. The main control CPU connects the current secondary circuit and the voltage secondary circuit through the low voltage area, and can obtain the current and voltage values generated by the current secondary circuit and the voltage secondary circuit. area, optical fiber two-way communication circuit, operation panel and computer communication port, the main control CPU controls the low-voltage area, optical fiber two-way communication circuit, operation panel and computer communication port; the low-voltage area is connected in parallel with the current secondary circuit and the voltage secondary circuit, The optical fiber two-way communication loop connects the optical fiber two-way communication loop in the high-voltage area through the optical fiber to exchange switching commands and battery status.

Further, the relay parallel device, the current transformer range automatic conversion device and method include the following steps;

In this embodiment, as shown in Figure 4, the battery supplies power to the single-chip microcomputer, and can supply power through the charger. The charger is an external device and is manually connected to the battery through aerial plug. When the charging is completed, remove the charger and the remaining battery power The optical fiber transmission control signal indicator is used to indicate, when the undervoltage indicator is on, it indicates that it needs to be charged. The battery charging circuit adopts a small door self-locking device. When the charging door is opened and switched to the charging mode, all the control power of the device is automatically turned off, and the device cannot work; only after the charging is completed, the device can return to normal working state when switched to work. The switching of the primary and secondary loops of this scheme is controlled by the input command of the single-chip microcomputer, and the information obtained after switching can be fed back to the single-chip microcomputer. The specific switching of the primary and secondary loops is as follows:

S1: The power supply area provides high voltage, enters the high voltage area master control, the low voltage area master control CPU receives the current transformation ratio and voltage transformation ratio signals sent by the computer, and is received by the high voltage area CPU through the communication optical fiber;

S2: After receiving the signal, the main control CPU in the high voltage area selects the required current switching output by analyzing the signal, and controls the high voltage to enter the current primary circuit and the voltage primary circuit;

S3: In the current primary loop, the corresponding current switching output terminals are driven according to the received different current transformation ratio signals, and the current switching is completed by entering the current secondary loop through the current transformer. The voltage primary loop receives the voltage transformation ratio signal, and passes the voltage transformer. The device enters the voltage secondary circuit to complete the voltage switching.

Figure 10 shows the electrical schematic diagram of one-time switching of the standard current transformer automatic switching device operating under high voltage. The primary automatic switching device of a standard current transformer operating in a high voltage state includes a primary high current switching relay module, a variable ratio relay drive module, a control signal interface, a control power supply and a primary high current relay contact. The main functions of the primary high-current switching relay module include: the selection of primary states of all transformation ratios of the standard current transformer, and the primary switching relay adopts a magnetic latching large-capacity relay, which is sensitive in action, good in reliability, and resistant to shock and vibration. Strong performance, dust-proof package, dual-coil control. The rated allowable current of a single contact can reach 100A, and the contact resistance is small. At least two of all circuits are used in parallel, and the overcurrent capability is strong. The variable ratio relay drive module is mainly used for the drive of variable ratio various current ratio relays. The driving mode is reliable and error-free. The control signal interface is mainly used for the connection between the primary switching device and the main control chip. The control power supply mainly provides the working power supply of the control and driving chips. The ground of the working power supply is connected to the system and is isolated from the ground. The main function of the primary high current relay contact is to provide a large current to pass through to form a complete circuit. The detailed standard transformation ratio switching is shown in the following table. The table shows the primary current, unit: A

Ampere turns L2 L3 L4 L5 L6 K2 1000 250 100 12.5 5 K3 1200 300 40 15 K4 1250 125 K5 1500 150 50 K6 1600 400 20 K7 1800 60 K8 2000 500 200 25 10 K9 2250 7 5 K10 2400 600 30

In the above table, as shown in Figure 5, the ampere turns of the coil corresponding to the current transformer between the primary current loop and the secondary current loop and the current generated by the primary current loop, in which the ampere turns of the K2 coil is 1000, and the The corresponding current primary loop output current L2 is 250A, L3 is 100A, L4 does not need to be used this time, L5 is 12.5A, L6 is 5A, the corresponding coil ampere turns and the current generated by the current primary loop form a standard current transformation ratio .

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A relay parallel device, comprising a base plate (9), characterized in that also comprising a current switching device; The current switching device includes a plurality of relays (10); Each of the relays (10) is provided with a current common terminal (11), a current output terminal (12) and a control terminal (13), and each of the relays (10) is fixedly installed on the on the bottom plate (9); Each of the current common terminals (11) is connected in parallel to form a relay common output terminal (1); The relay (10) includes relays with multiple current outputs; the current output terminals (12) of the relays with the same current output are connected in parallel to form the current switching output terminals of the current. 2. A relay parallel device according to claim 1, wherein the current switching output terminal comprises a current switching output terminal A (2), a current switching output terminal B (3), and a current switching output terminal C ( 4), the current switching output terminal D(5) and the current switching output terminal E(6); The primary current of the current switching output terminal A(2) is 250A-600A switching output terminal; The primary current of the current switching output terminal B(3) is 100A～200A switching output terminal; The primary current of the current switching output terminal C(4) is 40A-75A switching output terminal; The primary current of the current switching output terminal D(5) is 12.5A～30A switching output terminal; The primary current of the current switching output terminal E(6) is the switching output terminal of 5A˜10A. 3. A relay parallel device according to claim 2, wherein the current switching output terminal further comprises a current switching output terminal F (7) and a current switching output terminal G (8) as a backup current switching output terminal . 4 . The relay parallel device according to claim 3 , wherein there are multiple current switching output terminals F ( 7 ) and current switching output terminals G ( 8 ). 5 . 5 . The relay parallel device according to claim 1 , wherein each of the relays ( 10 ) is a large-capacity magnetic latching relay. 6 . 6. The current transformer range automatic conversion device, including the power supply area, the main control of the high voltage area and the main control of the low voltage area, the power supply area provides high voltage to the main control of the high voltage area, and the main control of the high voltage area is connected to the main control of the low voltage area by optical fiber. Intercommunication switching command and battery status, characterized in that it also includes a switching control system; The conversion control system includes a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a transformer calibrator; The high-voltage area mainly controls a parallel current primary circuit and a voltage primary circuit, the current primary circuit is connected to the current secondary circuit through a current transformer, and the voltage primary circuit is connected to the voltage secondary circuit through a voltage transformer; The transformer calibrator is connected in parallel with a current secondary circuit and a voltage secondary circuit; The low-voltage area is mainly controlled by a parallel current secondary circuit and a voltage secondary circuit; The current primary circuit adopts the relay parallel device according to any one of claims 1 to 5 . 7 . The automatic range conversion device of a current transformer according to claim 6 , wherein the power supply area includes an air base, a battery measurement loop and a power supply loop. 8 . 8. current transformer range automatic conversion device according to claim 7, is characterized in that, described high-voltage area main control comprises main control CPU, high-voltage area and optical fiber two-way communication loop, and described main control CPU controls high-voltage area and optical fiber Two-way communication loop; The high-voltage area is connected with a current primary circuit and a voltage primary circuit in parallel, and the optical fiber two-way communication circuit is connected to the low-voltage area master through an optical fiber to communicate switching commands and battery status. 9. The current transformer range automatic conversion device according to claim 8, wherein the main control of the low-voltage area comprises a main control CPU, a low-voltage area, an optical fiber two-way communication loop, an operation panel and a computer communication port, and the main The control CPU controls the low-voltage area, the optical fiber two-way communication loop, the operation panel and the computer communication port; The low-voltage area is connected with a current secondary circuit and a voltage secondary circuit in parallel, and the optical fiber bidirectional communication circuit is connected to the optical fiber bidirectional communication circuit in the high-voltage area through an optical fiber to communicate switching commands and battery status. 10 . The method for using the automatic range conversion device for a current transformer according to any one of claims 6 to 9 , wherein the method comprises the following steps; 11 . S1: The power supply area provides high voltage, enters the high voltage area master control, the low voltage area master control CPU receives the current transformation ratio and voltage transformation ratio signals sent by the computer, and is received by the high voltage area CPU through the communication optical fiber; S2: After receiving the signal, the main control CPU in the high voltage area selects the required current switching output by analyzing the signal, and controls the high voltage to enter the current primary circuit and the voltage primary circuit; S3: In the current primary loop, the corresponding current switching output terminals are driven according to the received different current transformation ratio signals, and the current switching is completed by entering the current secondary loop through the current transformer. The voltage primary loop receives the voltage transformation ratio signal, and passes the voltage transformer. The device enters the voltage secondary circuit to complete the voltage switching.

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