CN111781552A - Relay parallel device, and automatic current transformer range conversion device and method - Google Patents
Relay parallel device, and automatic current transformer range conversion device and method Download PDFInfo
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Abstract
The invention provides a current transformer range automatic switching device, wherein a power supply area provides high voltage and enters a high-voltage area main control, a low-voltage area main control CPU receives current transformation ratio and voltage transformation ratio signals sent by a computer and is received by the high-voltage area CPU through a communication optical fiber; after receiving the signal, the main control CPU in the high-voltage area selects a required current switching output end through analyzing the signal, and controls high voltage to enter a current primary loop and a voltage primary loop; in the current primary loop, the corresponding current switching output end is driven according to the received different current transformation ratio signals, the current transformer enters the current secondary loop to complete current switching, and the voltage primary loop receives the voltage transformation ratio signals and enters the voltage secondary loop to complete voltage switching. By adopting the scheme, the labor intensity is greatly reduced, and the working efficiency is effectively improved.
Description
Technical Field
The invention belongs to the technical field of testing of high voltage and large current which can be changed at will under the condition of simulating a power grid, and particularly relates to a relay parallel device, a current transformer range automatic switching device and a method.
Background
Distribution network high-voltage metering equipment is widely applied to the fields of power generation, power transmission, power distribution and the like of a power system, is numerous in quantity and wide in coverage, and currently, most of domestic relevant units adopt single-phase low-voltage state detection in the aspect of detecting the distribution network high-voltage metering equipment, and the state detection has some defects, namely the influence of high-voltage leakage current on the error of a current transformer and the influence of the error between adjacent phases. Although some places also adopt three-phase high-voltage state detection of simulation working conditions, because the tested and standard equipment are in a high-voltage state, the switching of the transformation ratio of the standard mutual inductor is troublesome, and the continuous work in the high-voltage state cannot be realized. And manual change transformation ratio is easy to cause wiring error, inaccurate measurement caused by artificial factors such as loop impedance deviation and the like, manual wiring switching transformation ratio is complex in work, large in labor intensity and low in working efficiency, and the current situation cannot be met.
With the rapid development of industry and economy in China and the continuous improvement of the living standard of people, electric power enters the market as a special commodity, and has higher requirements on the reliability and safety of power supply, the quality of power utilization and the accuracy of metering, so the reform of an electric power system and the establishment of the electric power market are in force, a series of technical schemes are also introduced by national power grid companies for the management of high-voltage metering equipment of a distribution network, some original traditional test methods are gradually eliminated, and under the background, the problem is very necessary to be solved, so that the method has important significance on the acceptance, the operation performance detection and the metering verification of the high-voltage metering equipment of the distribution network in the fields of power generation, power transmission, power distribution and the like of an electric power system.
Disclosure of Invention
The invention provides a relay parallel device, a current transformer range automatic switching device and a method, which are specially used for the detection and the metering verification of the expansion performance of distribution network high-voltage metering equipment under the simulation working condition (namely, the three-phase high voltage and three-phase heavy current state).
The technical means of the invention are as follows: a relay parallel device comprises a bottom plate and a current switching device;
the current switching device comprises a plurality of relays;
each relay is provided with a current common end, a current output end and a control end, and is fixedly installed on the bottom plate through the control end;
each current common end is connected in series to form a relay common output end;
the relay comprises a relay with various current outputs; the current output ends of the relays with the same current output are connected in series to form a current switching output end of the current.
When this scheme specifically functions, a plurality of relays all through control end fixed mounting on the bottom plate, are provided with electric current common port, current output end and control end on the relay, and the control end of every relay can received signal, controls the operation of every relay. The current common ends of the relays are connected in parallel to form a relay common output end, current is input from the relay common output end, and each relay can receive the current through the parallel connection and increase the contact overcurrent capacity. The relays comprise relays with various current outputs, the current output ends of the relays with the same current output are connected in parallel to form the current switching output ends of the current, and the relays with different quantities can output different currents required by people through the current switching output ends formed by the parallel connection of the current output ends.
Further, the current switching output end comprises a current switching output end A, a current switching output end B, a current switching output end C, a current switching output end D and a current switching output end E;
the primary current of the current switching output end A is 250-600A switching output end;
the primary current of the current switching output end B is 100-200A switching output end;
the primary current of the current switching output end C is 40A-75A switching output end;
the primary current of the current switching output end D is 12.5-30A switching output end;
the primary current of the current switching output end E is 5A-10A switching output end.
When the scheme is operated specifically, different current outputs are formed by different numbers of relays, wherein current output ends of 8 relays are connected in parallel to form a current switching output end A, the primary output current is 250A-600A, current output ends of 5 relays are connected in parallel to form a current switching output end B, the primary output current is 100A-200A, current output ends of 2 relays are connected in parallel to form a current switching output end C, the primary output current is 40A-75A, current switching output ends D and 12.5A-30A, current switching output ends F and 5A-10A are formed by one relay, and when specific current needs to be obtained, the current is switched to the current switching output ends needed by people.
Further, the current switching output end further includes a current switching output end F and a current switching output end G as standby current switching output ends.
When the scheme is operated specifically, the standby current switching output end F and the standby current switching output end G are arranged, and currents with other numerical values except the above values can be obtained.
Further, to make the obtained current value wider, the following are set: the current switching output ends F and the current switching output ends G are multiple.
Furthermore, the magnetic latching relay has the advantages of sensitive action, good reliability, good shock resistance and vibration resistance, dustproof packaging and double-coil control. The rated allowable current of a single contact can reach 100A, the contact resistance is small, two contacts are used in parallel in a loop, the overcurrent capacity can be increased, and the arrangement is as follows: each relay is a high-capacity magnetic latching relay.
Furthermore, the automatic range conversion device of the current transformer comprises a power supply area, a high-voltage area main control and a low-voltage area main control, wherein the power supply area provides high voltage for the high-voltage area main control, the high-voltage area main control is connected with the low-voltage area main control through optical fibers to carry out intercommunication switching commands and battery states, and the automatic range conversion device also comprises a conversion control system;
the conversion control system comprises a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a mutual inductor calibrator;
the high-voltage area master control is connected with a current primary loop and a voltage primary loop in parallel, the current primary loop is connected with a current secondary loop through a current transformer, and the voltage primary loop is connected with a voltage secondary loop through a voltage transformer;
the mutual inductor calibrator is connected with the current secondary circuit and the voltage secondary circuit in parallel;
the low-voltage area master control is connected with a current secondary circuit and a voltage secondary circuit in parallel;
the current primary loop adopts a relay parallel device as claimed in any one of claims 1-5.
When the scheme is specifically operated, the low-voltage area master control transmits signals to the high-voltage area master control through the communication optical fiber, the switching commands and the battery state are communicated, the power supply area inputs high voltage to the high-voltage area master control, the high-voltage area master control analyzes the signals and respectively inputs current and voltage into the current loop and the voltage loop after receiving the signals of the low-voltage area master control, 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. The relay parallel device is positioned in a current primary loop, signals transmitted by the low-voltage area are current transformation ratio and voltage transformation ratio required by people, and the high-voltage area master control controls different current switching output ends in the relay parallel device to operate by analyzing the signals so as to obtain the required current. The low-voltage area master control can obtain the current and voltage values output by the current secondary circuit and the voltage secondary circuit. The mutual inductor calibrator can automatically test the whole current and voltage loop, and ensures safe operation.
Further, the power supply area comprises an aviation seat, a battery measurement loop and a power supply loop.
When this scheme specifically operates, the power supply district includes aviation seat, battery measurement return circuit and power supply circuit, and the power supply district is by lithium cell power supply, and the external charging voltage of aviation seat can be given lithium cell charging, and the battery measurement return circuit can test out the electric quantity of lithium cell at any time to control aviation seat and charge, power supply circuit connects the high-voltage area master control and gives its power supply.
Further, the high-voltage area master control comprises a master control CPU, a high-voltage area and an optical fiber bidirectional communication loop, wherein the master control CPU controls the high-voltage area and the optical fiber bidirectional communication loop;
the high-voltage area is connected with a current primary loop and a voltage primary loop in parallel, and the optical fiber bidirectional communication loop is connected with a low-voltage area master control through an optical fiber to carry out intercommunication switching commands and battery states.
When the scheme is operated specifically, the high-voltage area main control is connected with the low-voltage area main control through the communication optical fiber to form an optical fiber bidirectional communication loop, the high-voltage area main control and the low-voltage area main control are communicated with a switching command and a battery state, meanwhile, a main control CPU in the high-voltage area main control can receive a transformation ratio signal of the low-voltage area main control, the main control CPU inputs high voltage into a current primary loop and a voltage primary loop through the high-voltage area, and the main control CPU controls different current switching output ends in the switching relay parallel connection device to operate through an analytic signal.
Furthermore, the low-voltage area master control comprises a master control CPU, a low-voltage area, an optical fiber bidirectional communication loop, an operation panel and a computer communication port, wherein the master control CPU controls the low-voltage area, the optical fiber bidirectional communication loop, the operation panel and the computer communication port;
the low-voltage area is connected with the current secondary circuit and the voltage secondary circuit in parallel, and the optical fiber bidirectional communication circuit is connected with the optical fiber bidirectional communication circuit in the high-voltage area through an optical fiber to carry out intercommunication switching commands and battery states.
When the scheme is operated specifically, a master control CPU in the master control of the low-voltage area obtains signals of a computer communication port, analyzes the signals into current transformation ratio and voltage transformation ratio required by people, and transmits the transformation ratio signals to the master control of the high-voltage area through communication optical fibers. The operation panel in the low-voltage area main control can control the operation of the whole control main control CPU and display the current and voltage values. The main control CPU is connected with the current secondary circuit and the voltage secondary circuit through the low-voltage area, and current and voltage values generated by the current secondary circuit and the voltage secondary circuit can be obtained.
Further, the relay parallel device, the current transformer range automatic switching device and the method comprise the following steps;
when this scheme specifically functions, the battery supplies power for the singlechip to can supply power through the charger, the charger belongs to external equipment, inserts manual connection through navigating and inserting with the battery, after the completion of charging, moves the charger, and battery residual capacity adopts optic fibre transmission control signal pilot lamp to instruct, when under-voltage indicator lights, then the suggestion needs to charge. A battery charging loop adopts a small door self-locking device, when a charging door is opened and switched to a charging mode, all control power supplies of the device are automatically closed, and the device cannot work; only after charging is completed, the device can be switched to work to recover the normal working state. The switching of the primary loop and the secondary loop of the scheme is controlled by the input instruction of the single chip microcomputer, the information obtained after the switching can be fed back to the single chip microcomputer, and the specific switching of the primary loop and the secondary loop is switched to the following steps:
s1: the power supply area provides high voltage and enters the high-voltage area main control, and the low-voltage area main control CPU receives current transformation ratio and voltage transformation ratio signals sent by a computer and is received by the high-voltage area CPU through a communication optical fiber;
s2: after receiving the signal, the main control CPU in the high-voltage area selects a required current switching output end through analyzing the signal, and controls high voltage to enter a current primary loop and a voltage primary loop;
s3: in the current primary loop, the corresponding current switching output end is driven according to the received different current transformation ratio signals, the current transformer enters the current secondary loop to complete current switching, and the voltage primary loop receives the voltage transformation ratio signals and enters the voltage secondary loop to complete voltage switching.
The invention has the following beneficial effects:
the invention provides a relay parallel device, a current transformer range automatic switching device and a method, which are specially used for the development performance detection and the metering verification of distribution network high-voltage metering equipment under the simulation working condition (namely the three-phase high voltage and three-phase heavy current state).
Drawings
FIG. 1 is a schematic connection diagram for controlling the automatic loop switching process provided by the present invention;
FIG. 2 is a schematic structural diagram of a relay provided by the present invention;
fig. 3 is a schematic structural diagram of a parallel relay device provided by the present invention;
FIG. 4 is a schematic diagram of the whole single-chip microcomputer device circuit provided by the invention;
FIG. 5 is a schematic diagram of the connection between the primary current loop and the secondary current loop provided by the present invention;
FIG. 6 is a schematic diagram of the connection between the primary voltage loop and the secondary voltage loop provided by the present invention;
FIG. 7 is a schematic diagram of the power supply region for the switching process provided by the present invention;
FIG. 8 is a schematic structural diagram of a high voltage zone master control provided by the present invention;
FIG. 9 is a schematic structural diagram of a bottom bay master control provided in the present invention;
fig. 10 is a primary switching electrical schematic diagram of the primary automatic switching device provided by the present invention.
The reference numbers in the figures are: 1. relay common output, 2, current switching output a, 3, current switching output B, 4, current switching output C, 5 current switching output D, 6, current switching output E, 7, current switching output F, 8, current switching output G, 9, bottom plate, 10, relay, 11, current common, 12, current output, 13, control.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present invention is illustrated in detail by the following examples.
Example (b): as shown in fig. 1 to 10, a relay parallel device includes a base plate 9, and further includes a current switching device;
the current switching device includes a plurality of relays 10;
each relay 10 is provided with a current common end 11, a current output end 12 and a control end 13, and each relay 10 is fixedly installed on the bottom plate 9 through the control end 13;
each current common terminal 11 forms a relay common output terminal 1 through series connection;
the relay 10 comprises a relay 10 with various current outputs; the current output terminals 12 of the relays 10 with the same current output are connected in series to form a current switching output terminal of the current.
In this embodiment, the plurality of relays 10 are all fixedly mounted on the bottom plate 9 through the control end 13, the relays 10 are provided with the current common end 11, the current output end 12 and the control end 13, and the control end 13 of each relay 10 can receive signals to control the operation of each relay 10. The current common terminal 11 of each relay 10 is connected in parallel to form a relay common output terminal 1, current is input from the relay common output terminal 1, and each relay 10 can receive the current through the parallel connection and increase the contact overcurrent capacity. The relay 10 comprises relays 10 with various current outputs, current output ends 12 of the relays 10 with the same current output are connected in parallel to form current switching output ends of the current, and different relays 10 can output different currents required by people through the current switching output ends formed by connecting the current output ends 12 in parallel.
In this embodiment, different current outputs are formed by different numbers of relays 10, wherein the current output terminals 12 of 8 relays 10 are connected in parallel to form a current switching output terminal a2, the primary output current is 250A-600A, wherein the current output ends 12 of the 5 relays 10 are connected in parallel to form a current switching output end B3, the primary output current is 100A-200A, wherein the current output ends 12 of 2 relays 10 are connected in parallel to form a current switching output end C4, the primary output current is 40A-75A, the current switching output end D5 formed by the current output end 12 of one relay 10 is 12.5A-30A, the current switching output end F6 formed by the current output end 12 of one relay 10 is 5A-10A, when we need to obtain a specific current, the current switching output end needed by us is switched. The method comprises the following steps: the current switching output end comprises a current switching output end A2, a current switching output end B3, a current switching output end C4, a current switching output end D5 and a current switching output end E6; the primary current of the current switching output end A2 is 250-600A switching output end; the primary current of the current switching output end B3 is 100-200A switching output end; the primary current of the current switching output end C4 is a switching output end from 40A to 75A; the primary current of the current switching output end D5 is 12.5-30A switching output end; the primary current of the current switching output end E6 is 5A-10A switching output end.
In this embodiment, the standby current switching output terminal F7 and the standby current switching output terminal G8 are provided to obtain currents of other values than the above, and the setting is: the current switching outputs also include current switching output F7 and current switching output G8 as standby current switching outputs.
In this embodiment, in order to obtain a wider current value, the following settings are set: the current switching output terminal F7 and the current switching output terminal G8 are plural.
In this embodiment, the magnetic latching relay 10 is sensitive in operation, good in reliability, good in shock resistance and vibration resistance, dustproof in packaging, and controlled by a double coil. The rated allowable current of a single contact can reach 100A, the contact resistance is small, two contacts are used in parallel in a loop, the overcurrent capacity can be increased, and the arrangement is as follows: each of the relays 10 is a large capacity magnetic latching relay.
Furthermore, the automatic range conversion device of the current transformer comprises a power supply area, a high-voltage area main control and a low-voltage area main control, wherein the power supply area provides high voltage for the high-voltage area main control, the high-voltage area main control is connected with the low-voltage area main control through optical fibers to carry out intercommunication switching commands and battery states, and the automatic range conversion device also comprises a conversion control system;
the conversion control system comprises a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a mutual inductor calibrator;
the high-voltage area master control is connected with a current primary loop and a voltage primary loop in parallel, the current primary loop is connected with a current secondary loop through a current transformer, and the voltage primary loop is connected with a voltage secondary loop through a voltage transformer;
the mutual inductor calibrator is connected with the current secondary circuit and the voltage secondary circuit in parallel;
the low-voltage area master control is connected with a current secondary circuit and a voltage secondary circuit in parallel;
the current primary loop adopts a relay parallel device as claimed in any one of claims 1-5.
In this embodiment, the low-voltage area master control transmits a signal to the high-voltage area master control through the communication optical fiber, the switching command and the battery state are communicated, the power supply area inputs high voltage to the high-voltage area master control, the high-voltage area master control analyzes the signal and respectively inputs current and voltage into the current loop and the voltage loop after receiving the signal of the low-voltage area master control, the current primary loop converts current through the current transformer and the current secondary loop, and the voltage primary loop converts voltage through the voltage transformer and the voltage secondary loop. The relay parallel device is positioned in a current primary loop, signals transmitted by the low-voltage area are current transformation ratio and voltage transformation ratio required by people, and the high-voltage area master control controls different current switching output ends in the relay parallel device to operate by analyzing the signals so as to obtain the required current. The low-voltage area master control can obtain the current and voltage values output by the current secondary circuit and the voltage secondary circuit. The mutual inductor calibrator can automatically test the whole current and voltage loop, and ensures safe operation.
In this embodiment, the power supply district is including aviation seat, battery measurement return circuit and power supply circuit, and the power supply district is by lithium cell power supply, and the external charging voltage of aviation seat can be for lithium cell charging, and the battery measurement return circuit can test out the electric quantity of lithium cell at any time to control aviation seat and charge, power supply circuit connects the high nip master control and gives its power supply, sets up to: the power supply area comprises an aviation seat, a battery measurement circuit and a power supply circuit.
In this embodiment, the high-voltage area master control is connected with the low-voltage area master control through the communication optical fiber to form an optical fiber bidirectional communication loop, the high-voltage area master control and the low-voltage area master control communicate a switching command and a battery state, and meanwhile, a master control CPU in the high-voltage area master control can receive a transformation ratio signal of the low-voltage area master control, the master control CPU inputs high voltage into a current primary loop and a voltage primary loop through the high-voltage area, and the master control CPU controls different current switching output ends in the switching relay parallel connection device to operate through analyzing the signal. The method comprises the following steps: the high-voltage area master control comprises a master control CPU, a high-voltage area and an optical fiber bidirectional communication loop, wherein the master control CPU controls the high-voltage area and the optical fiber bidirectional communication loop; the high-voltage area is connected with a current primary loop and a voltage primary loop in parallel, and the optical fiber bidirectional communication loop is connected with a low-voltage area master control through an optical fiber to carry out intercommunication switching commands and battery states.
In this embodiment, the main control CPU in the low-voltage area main control obtains the signal of the computer communication port, analyzes the signal into the current transformation ratio and the voltage transformation ratio which are required by the user, and transmits the transformation ratio signal to the high-voltage area main control through the communication optical fiber. The operation panel in the low-voltage area main control can control the operation of the whole control main control CPU and display the current and voltage values. The main control CPU is connected with the current secondary circuit and the voltage secondary circuit through the low-voltage area, can obtain current and voltage values generated by the current secondary circuit and the voltage secondary circuit, and is set as follows: the low-voltage area master control comprises a master control CPU, a low-voltage area, an optical fiber bidirectional communication loop, an operation panel and a computer communication port, wherein the master control CPU controls the low-voltage area, the optical fiber bidirectional communication loop, the operation panel and the computer communication port; the low-voltage area is connected with the current secondary circuit and the voltage secondary circuit in parallel, and the optical fiber bidirectional communication circuit is connected with the optical fiber bidirectional communication circuit in the high-voltage area through an optical fiber to carry out intercommunication switching commands and battery states.
Further, the relay parallel device, the current transformer range automatic switching device and the method comprise the following steps;
in this embodiment, as shown in fig. 4, the battery supplies power to the singlechip to can supply power through the charger, the charger belongs to external equipment, and insert manual connection through boat with the battery, after the completion of charging, move the charger, the battery residual capacity adopts optic fibre transmission control signal pilot lamp to instruct, when the under-voltage pilot lamp was lighted, then the suggestion needs to charge. A battery charging loop adopts a small door self-locking device, when a charging door is opened and switched to a charging mode, all control power supplies of the device are automatically closed, and the device cannot work; only after charging is completed, the device can be switched to work to recover the normal working state. The switching of the primary loop and the secondary loop of the scheme is controlled by the input instruction of the single chip microcomputer, the information obtained after the switching can be fed back to the single chip microcomputer, and the specific switching of the primary loop and the secondary loop is switched to the following steps:
s1: the power supply area provides high voltage and enters the high-voltage area main control, and the low-voltage area main control CPU receives current transformation ratio and voltage transformation ratio signals sent by a computer and is received by the high-voltage area CPU through a communication optical fiber;
s2: after receiving the signal, the main control CPU in the high-voltage area selects a required current switching output end through analyzing the signal, and controls high voltage to enter a current primary loop and a voltage primary loop;
s3: in the current primary loop, the corresponding current switching output end is driven according to the received different current transformation ratio signals, the current transformer enters the current secondary loop to complete current switching, and the voltage primary loop receives the voltage transformation ratio signals and enters the voltage secondary loop to complete voltage switching.
Fig. 10 is a primary switching electrical schematic diagram of a primary automatic switching device of a standard current transformer operating in a high-voltage state. The primary automatic switching device of the standard current transformer operating in the high-voltage state comprises a primary large-current switching relay module, a transformation ratio relay driving module, a control signal interface, a control power supply and a primary large-current relay contact. The main functions of the primary high-current switching relay module comprise: the standard current transformer selects all transformation ratio primary states, a magnetic latching type high-capacity relay is adopted as a primary switching relay, and the relay is sensitive in action, good in reliability, strong in shock resistance and vibration resistance, dustproof in packaging and double-coil control. The rated allowable current of a single contact can reach 100A, the contact resistance is small, at least two loops are used in parallel, and the overcurrent capacity is strong. The transformation ratio relay driving module is mainly used for driving transformation ratio relays with various current ratios, and the driving mode is reliable and free of error action. The control signal interface is mainly used for connecting the primary switching device with the main control chip. The control power supply mainly provides a working power supply for controlling and driving the chip, and the ground of the working power supply is connected with the system and is in an isolated state with the ground. The primary high-current relay contact mainly has the functions of providing primary high current to pass through to form a complete loop, the detailed standard transformation ratio switching is shown in the following table, and primary current, unit are shown in the table: a. the
| Ampere turn number | 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 fig. 5, the number of 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 are shown, where the number of ampere-turns of the coil K2 is 1000, the output current L2 of the corresponding primary current loop is 250A, L3 is 100A, L4 is not needed to be used at this time, L5 is 12.5A, and L6 is 5A, and the number of ampere-turns of the coil corresponding to each current transformer and the current generated by the primary current loop form a standard current transformation ratio.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A parallel relay device comprises a bottom plate (9) and is characterized by further comprising a current switching device;
the current switching device comprises a plurality of relays (10);
each relay (10) is provided with a current common end (11), a current output end (12) and a control end (13), and each relay (10) is fixedly arranged on the bottom plate (9) through the control end (13);
each current common terminal (11) is connected in parallel to form a relay common output terminal (1);
the relay (10) comprises a relay of a plurality of current outputs; the current output ends (12) of the relays with the same current output are connected in parallel to form a current switching output end of the current.
2. A relay parallel arrangement according to claim 1, wherein said current switching outputs comprise a current switching output a (2), a current switching output B (3), a current switching output C (4), a current switching output D (5) and a current switching output E (6);
the primary current of the current switching output end A (2) is 250-600A switching output end;
the primary current of the current switching output end B (3) is 100-200A switching output end;
the primary current of the current switching output end C (4) is 40-75A switching output end;
the primary current of the current switching output end D (5) is 12.5-30A switching output end;
the primary current of the current switching output end E (6) is 5A-10A switching output end.
3. A relay parallel arrangement according to claim 2, wherein said current switching outputs further comprise a current switching output F (7) and a current switching output G (8) as standby current switching outputs.
4. A relay parallel arrangement according to claim 3, wherein there are a plurality of said current switching outputs F (7) and G (8).
5. A parallel relay arrangement according to claim 1, wherein each of said relays (10) is a high capacity magnetic latching relay.
6. The automatic range conversion device of the current transformer comprises a power supply area, a high-voltage area main control and a low-voltage area main control, wherein the power supply area provides high voltage for the high-voltage area main control;
the conversion control system comprises a current primary loop, a current secondary loop, a voltage primary loop, a voltage secondary loop and a mutual inductor calibrator;
the high-voltage area master control is connected with a current primary loop and a voltage primary loop in parallel, the current primary loop is connected with a current secondary loop through a current transformer, and the voltage primary loop is connected with a voltage secondary loop through a voltage transformer;
the mutual inductor calibrator is connected with the current secondary circuit and the voltage secondary circuit in parallel;
the low-voltage area master control is connected with a current secondary circuit and a voltage secondary circuit in parallel;
the current primary loop adopts a relay parallel device as claimed in any one of claims 1-5.
7. The automatic current transformer range switching device according to claim 6, wherein the power supply area comprises an aviation seat, a battery measurement loop and a power supply loop.
8. The automatic range switching device of a current transformer according to claim 7, wherein the high-voltage area master control comprises a master control CPU, a high-voltage area and an optical fiber bidirectional communication loop, and the master control CPU controls the high-voltage area and the optical fiber bidirectional communication loop;
the high-voltage area is connected with a current primary loop and a voltage primary loop in parallel, and the optical fiber bidirectional communication loop is connected with a low-voltage area master control through an optical fiber to carry out intercommunication switching commands and battery states.
9. The automatic range switching device of a current transformer according to claim 8, wherein the low-voltage area master control comprises a master control CPU, a low-voltage area, an optical fiber bidirectional communication loop, an operation panel and a computer communication port, and the master control CPU controls the low-voltage area, the optical fiber bidirectional communication loop, the operation panel and the computer communication port;
the low-voltage area is connected with the current secondary circuit and the voltage secondary circuit in parallel, and the optical fiber bidirectional communication circuit is connected with the optical fiber bidirectional communication circuit in the high-voltage area through an optical fiber to carry out intercommunication switching commands and battery states.
10. The method for using the automatic range switching device of the current transformer as claimed in any one of claims 6 to 9, characterized by comprising the following steps;
s1: the power supply area provides high voltage and enters the high-voltage area main control, and the low-voltage area main control CPU receives current transformation ratio and voltage transformation ratio signals sent by a computer and is received by the high-voltage area CPU through a communication optical fiber;
s2: after receiving the signal, the main control CPU in the high-voltage area selects a required current switching output end through analyzing the signal, and controls high voltage to enter a current primary loop and a voltage primary loop;
s3: in the current primary loop, the corresponding current switching output end is driven according to the received different current transformation ratio signals, the current transformer enters the current secondary loop to complete current switching, and the voltage primary loop receives the voltage transformation ratio signals and enters the voltage secondary loop to complete voltage switching.
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