A non-opening cabinet door type current transformer ratio acquisition and reading device and method

Abstract

The present invention provides a non-opening cabinet door type current transformer ratio acquisition and reading device, the current acquisition device is a current transformer containing a reference coil and a coil to be measured that is actually used, and is used to convert the primary current value of the cable into a reference current value and a secondary current value that is actually used; the ratio reading device includes a ratio calculation module and a display module, the ratio calculation module calculates the ratio value of the coil to be measured according to the reference current value obtained by the current acquisition device and the secondary current value that is actually used; the display module is used to display the ratio value calculated by the ratio calculation module. The device directly calculates the ratio value of the coil to be measured according to the secondary current value collected by the reference coil in the current acquisition device and the secondary current value of the coil to be measured, avoiding the cumbersome operation of shutting down the equipment in advance, opening the cabinet door after power testing, and entering the cable cabinet to read the actual ratio of the coil to be measured in traditional operations, greatly improving the work efficiency of current transformer ratio acquisition.

Description

Technical Field

[0001] The invention belongs to the technical fields of equipment operation inspection, metering, protection, etc., and in particular relates to a device and method for collecting and reading the ratio of a non-opening cabinet door type current transformer. Background Art

[0002] Current transformers are widely used in the company's operation, inspection, marketing and other professional fields. The use scenarios include substation / distribution station telemetry current value collection, protection setting setting, marketing metering electricity fee collection, etc. Current transformers are usually installed on the primary side cable. After the primary side cable is powered, the current transformer is energized. The compartment cabinet door where the primary cable and current transformer are installed usually needs to be sealed and equipped with a five-protection locking device to prevent the risk of electric shock. After power is supplied, when performing work such as setting the protection device setting and calibrating the marketing metering device, it is usually necessary to shut down the power to check the transformer ratio information. For some equipment that has been put into operation but the ratio is not recorded, the front-line operation and maintenance personnel usually need to coordinate the dispatching department to shut down the debugging equipment, and open the equipment cabinet door after the power outage to read the required current transformer ratio. Not only is the operation cumbersome and time-consuming, but there is also a certain risk of electric shock, which seriously affects the work efficiency of the transmission and commissioning of the distribution automation equipment, and thus affects the power supply reliability of the distribution line. Summary of the invention

[0003] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide a non-opening cabinet door type current transformer ratio acquisition and reading device and method, aiming to calculate the required current transformer ratio without opening the equipment cabinet door.

[0004] In a first aspect, an embodiment of the present invention provides a non-opening cabinet-type current transformer ratio acquisition and reading device, comprising a current acquisition device and a ratio reading device.

[0005] The current acquisition device is a current transformer including two turns of coils, the two turns of coils are a reference coil and a coil to be measured that is actually used; the current acquisition device is used to collect the secondary current value of the reference coil and the secondary current value of the coil to be measured;

[0006] The transformation ratio reading device includes a transformation ratio calculation module and a display module, which are integrated together; the transformation ratio calculation module is used to calculate the transformation ratio value of the coil to be measured according to the current value obtained by the current acquisition device; the display module is used to display the transformation ratio value calculated by the transformation ratio calculation module;

[0007] Wherein, the reference coil is connected to a common end of the coil to be measured.

[0008] Preferably, the secondary side of the current acquisition device has three secondary wires, and the fixed transformation ratio of the reference coil is 100:1.

[0009] Preferably, the calculation formula of the transformation ratio calculation module is:

[0010] The transformation ratio k of the coil to be measured is:

[0011] ;

[0012] In the formula, the secondary current value of the reference coil is mA, the secondary current value of the coil to be measured is nA, and the primary current value of the cable is 100mA.

[0013] In a second aspect, an embodiment of the present invention provides a method for collecting and reading the transformation ratio of a non-opening cabinet-door type current transformer, comprising:

[0014] Turn on the power of the ratio reading device and make sure the display screen of the display module is bright;

[0015] The three measuring terminals of the ratio calculation module are respectively connected to the S1, S2, and S3 terminals of the current acquisition device, and the line connection is checked to ensure that there is no disconnection, and the secondary side measurement current values ​​of the reference coil and the coil to be measured are obtained;

[0016] Based on the obtained current values ​​measured on the secondary sides of the reference coil and the coil to be measured, the transformation ratio calculation module calculates the transformation ratio value of the coil to be measured and displays the value on the display screen of the display module.

[0017] The embodiments of the present invention bring the following beneficial effects:

[0018] This device can directly calculate the transformation ratio value of the coil to be measured based on the secondary current value collected by the reference coil in the current acquisition device and the secondary current value of the coil to be measured, using the transformation ratio calculation module in the device. The staff can use this device to directly measure the transformation ratio value of the required coil without opening the door of the ring network cabinet, avoiding the tedious operation of shutting down the equipment in advance, opening the cabinet door after power testing, entering the cable cabinet to read the actual transformation ratio of the coil to be measured in traditional operations, thereby greatly improving the work efficiency of current transformer transformation ratio acquisition.

[0019] Other features and advantages of the present invention will be described in the following description, and some features will become apparent from the description or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following is a preferred embodiment, and in conjunction with the accompanying drawings, a detailed description is given as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a current collection device provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the principle of a current collection device provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the principle of a non-opening cabinet door type current transformer ratio acquisition and reading device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] To facilitate understanding of this embodiment, a non-opening cabinet type current transformer ratio acquisition and reading device disclosed in Embodiment 1 of the present invention is first described in detail. Figure 1-Figure 3 As shown, it includes a current acquisition device and a transformation ratio reading device,

[0026] The current acquisition device is a current transformer including two turns of coils, the two turns of coils are a reference coil and a coil to be measured that is actually used; the current acquisition device is used to collect the secondary current value of the reference coil and the secondary current value of the coil to be measured;

[0027] Among them, the current acquisition device includes a group of reference coils and a group of coils to be measured cast inside the primary cable, and the common ends of the reference coils and the coils to be measured are connected, that is, the secondary side of the current acquisition device has three secondary wires, including the common end S1 of the reference coil and the coil to be measured, and the other ends of the reference coil and the coil to be measured are named S2 and S3 respectively, and the fixed transformation ratio of the reference coil is 100:1, which is used to collect reference current as a reference value for calculating the transformation ratio; the coil to be measured is used for actual protection and measurement.

[0028] Furthermore, for the power distribution equipment that has been put into operation, after the cabinet door below the power distribution cabinet is sealed, the coil actually used is the coil to be measured.

[0029] The transformation ratio reading device includes a transformation ratio calculation module and a display module, which are integrated together; the transformation ratio calculation module is used to calculate the transformation ratio value of the coil to be measured according to the current value obtained by the current acquisition device; the display module is used to display the transformation ratio value calculated by the transformation ratio calculation module;

[0030] Furthermore, the calculation formula of the transformation ratio calculation module is:

[0031] The transformation ratio k of the coil to be measured is:

[0032] ;

[0033] In the formula, the secondary current value of the reference coil is mA, the secondary current value of the coil to be measured is nA, and the primary current value of the cable is 100mA.

[0034] Embodiment 2: During the setting and operation of the protection device, the embodiment of the present invention provides a method for collecting and reading the ratio of a non-opening cabinet type current transformer, including:

[0035] Turn on the power of the ratio reading device and make sure the display screen of the display module is bright;

[0036] The three measuring terminals of the ratio calculation module are respectively connected to the S1, S2, and S3 terminals of the current acquisition device, and the line connection is checked to ensure that there is no disconnection, and the secondary side measurement current values ​​of the reference coil and the coil to be measured are obtained;

[0037] Based on the obtained current values ​​measured on the secondary sides of the reference coil and the coil to be measured, the transformation ratio calculation module calculates the transformation ratio value of the coil to be measured and displays the value on the display screen of the display module.

[0038] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A non-opening cabinet type current transformer ratio acquisition and reading device, characterized in that: Including current acquisition device and ratio reading device, The current acquisition device is a current transformer including two turns of coils, the two turns of coils are a reference coil and a coil to be measured that is actually used; the current acquisition device is used to collect the secondary current value of the reference coil and the secondary current value of the coil to be measured; The transformation ratio reading device includes a transformation ratio calculation module and a display module, which are integrated together; the transformation ratio calculation module is used to calculate the transformation ratio value of the coil to be measured according to the current value obtained by the current acquisition device; the display module is used to display the transformation ratio value calculated by the transformation ratio calculation module; Wherein, the common end of the reference coil and the coil to be measured are connected; The secondary side of the current acquisition device has three secondary wires, and the fixed transformation ratio of the reference coil is 100:

1.

2. The current transformer ratio acquisition and reading device according to claim 1, characterized in that: The calculation formula of the transformation ratio calculation module is: The transformation ratio k of the coil to be measured is: k = 100m / n; In the formula, the secondary current value of the reference coil is mA, the secondary current value of the coil to be measured is nA, and the primary current value of the cable is 100mA.

3. A method for using the current transformer ratio acquisition and reading device according to claim 1, characterized in that: include, Turn on the power of the ratio reading device and make sure the display screen of the display module is bright; The three measuring terminals of the ratio calculation module are respectively connected to the S1, S2, and S3 terminals of the current acquisition device, and the line connection is checked to ensure that there is no disconnection, and the secondary side measurement current values ​​of the reference coil and the coil to be measured are obtained; Based on the obtained current values ​​measured on the secondary sides of the reference coil and the coil to be measured, the transformation ratio calculation module calculates the transformation ratio value of the coil to be measured and displays the value on the display screen of the display module.

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