CN201867487U

CN201867487U - Multi-power-factor current transformer load box

Info

Publication number: CN201867487U
Application number: CN201020633912XU
Authority: CN
Inventors: 阴存贞; 贺鸿祺; 李炜东; 吴经锋; 李勇; 刘毅; 吴良科; 孙浩良; 章述汉; 项琼; 汪泉; 杨洪
Original assignee: State Grid Electric Power Research Institute; Northwest China Grid Co Ltd
Current assignee: State Grid Electric Power Research Institute; Northwest China Grid Co Ltd
Priority date: 2010-11-30
Filing date: 2010-11-30
Publication date: 2011-06-15
Anticipated expiration: 2020-11-30

Abstract

The utility model provides a multi-power-factor current transformer load box, which comprises a first binding post, a second binding post, a reactive component unit and an active component unit, wherein the reactive component unit and the active component unit are connected with the first binding post and the second binding post in series. The reactive component unit includes a first load plate, a second load plate and a third load plate which are mutually connected in series; the active component unit includes a fourth load plate, a fifth load plate and a sixth load plate which are mutually connected in series; each of the first load plate, the second load plate and the third load plate includes a band switch and an adjustable resistor; the resistances of the adjustable resistors of the first load plate, the second load plate and the third load plate are different; each of the fourth load plate, the fifth load plate and the sixth load plate includes a band switch and an adjustable inductor; and the inductances of the adjustable inductors of the fourth load plate, the fifth load plate and the sixth load plate are different. The multi-power-factor current transformer load box is simple in structure and convenient in use, is provided with the reactive component unit and the active component unit which are independent, can obtain various load values under different power factors (0-1.0) after combination of the reactive component unit and the active component unit, and can also be used as a load box with cos (cosine) phi=0.8 after correct number setting.

Description

Many power factors current transformer Burden box

[technical field]

The utility model relates to a kind of mutual inductor Burden box, particularly a kind of current transformer Burden box.

[background technology]

When the current transformer Burden box is the check current transformer, providing the necessary instrument of various service loads specially, is the desirable instrument of full-automatic mutual inductor checking table and on-the-spot transformer error test.

Common used current transformer Burden box is that cos φ=0.8 makes by rated power factor all in the electric system, the power factor of used Burden box was cos φ=1.0 when the standard Current Transformer was made in calibrating in the laboratory, and the power factor of secondary load is not to be entirely cos φ=0.8 during the current transformer actual motion, therefore, being necessary to develop a kind of current transformer Burden box can satisfy current transformer can apply secondary load under the various different capacity factors when calibrating.

[utility model content]

The purpose of this utility model provides a kind of many power factors current transformer Burden box, can apply the secondary load under the various different capacity factors when current transformer is examined and determine.

To achieve these goals, the utility model adopts following technical scheme:

A kind of many power factors current transformer Burden box comprises first binding post, second binding post and the idle component unit and the real component unit of connecting with it.

Described idle component unit comprises the first load dish, the second load dish and the 3rd load dish of series connection; Described real component unit comprises the 4th load dish, the 5th load dish and the 6th load dish.

The described first load dish comprises first waver and first variable inductor, and the described second load dish comprises second waver and second variable inductor, and described the 3rd load dish comprises triband switch and the 3rd variable inductor; Described the 4th load dish comprises the 4th waver and the 4th adjustable resistor, and described the 5th load dish comprises the 5th waver and the 5th adjustable resistor, and described the 6th load dish comprises the 6th waver and the 6th adjustable resistor.

Described second binding post links described the 3rd variable inductor by the triband switch; Described the 3rd variable inductor connects second variable inductor by second waver; Described second variable inductor connects first variable inductor by first waver; Described first variable inductor connects described the 4th adjustable resistor; Described the 4th adjustable resistor connects described the 5th adjustable resistor by the 4th waver; Described the 5th adjustable resistor connects the 6th adjustable resistor by the 5th waver; Described the 6th adjustable resistor connects first binding post by the 6th waver.

Described first variable inductor is composed in series by the inductor that 4 resistance values are 10 Ω; Second variable inductor is composed in series by the inductor that 10 resistance values are 1 Ω; The 3rd variable inductor is composed in series by the inductor that 10 resistance values are 0.1 Ω; The 4th adjustable resistor is made up of the resistor in series that 4 resistance values are 10 Ω; The 5th adjustable resistor is made up of the resistor in series that 10 resistance values are 1 Ω; The 6th adjustable resistor is made up of the resistor in series that 10 resistance values are 0.1 Ω.

Compared with prior art, the utlity model has following advantage: a kind of many power factors current transformer of the utility model Burden box is simple in structure, easy to use, be provided with independently real component unit and idle component unit, by obtaining various load values different capacity factor (0-1.0) under after the combination, also can correctly put the Burden box use of doing cos φ=0.8 behind the number simultaneously.

[description of drawings]

Fig. 1 is the utility model Burden box surface structure synoptic diagram;

Fig. 2 is the utility model Burden box electrical block diagram.

[embodiment]

Below in conjunction with accompanying drawing the utility model is done and to be described in further detail.

Because the current transformer rated secondary current is 1A in the measuring apparatus of critical point at present, this metering and Verification of Measuring Current Transformer of sentencing that rated secondary current is 1A is an example, its specified secondary load maximum generally is designed to 30VA, and now the great majority actual secondary load of metering Current Transformer that newly puts into operation in the transformer station is all very little, so the current capacity case design load capacity in this programme will be considered by 50VA.This Burden box rated current is designed to 1A, and accuracy is 3 grades, and the limits of error are ± 3% nominal value ± 0.01VA, and rated frequency is 50HZ.

See also Figure 1 and Figure 2, the load value of a kind of many power factors current transformer of the utility model Burden box 100 is made up of real component unit (pure resistance of noninductive coiling) and idle component unit (pure inductance contains a small amount of resistive component) two parts, maximum carrying capacity is 51VA, each minutes three dish design, the multiplying power of idle component first load dish 11 and real component the 4th load dish 21 is 10VA, only has 0,1,2,3 and 4 totally 5 grades; The multiplying power of idle component second load dish 12 and real component the 5th load dish 22 is 1VA, adopts decimal system mode, promptly from 0 to 10 totally 11 grades; The multiplying power of idle component the 3rd load dish 13 and real component the 6th load dish 23 is 0.1VA, adopts decimal system mode, promptly from 0 to 10 totally 11 grades.See also shown in the table 1, be the utility model Burden box load value scope.

Table 1 Burden box load value scope

Overload Class	Scope (VA)	Array mode (VA)
			Real component	0-51	(0-4)10+(0-10)1+(0-10)*0.1
Idle component	0-51	(0-4)10+(0-10)1+(0-10)*0.1

Real component unit and idle component units in series are between binding post Z1 and Z2, and promptly first to the

6th load dish

11,12,13,21,22,23 is series between binding post Z1 and the Z2.

The first load dish 11 comprises first waver 110 and first variable inductor 111, the second load dish 12 comprises second waver 120 and second variable inductor 111, the 3rd load dish 13 comprises triband switch 130 and the 3rd variable inductor 131, the 4th load dish 21 comprises the 4th waver 210 and the 4th adjustable resistor 211, the 5th load dish 22 comprises that the 5th waver 220 and the 5th adjustable resistor 221, the six load dishes 23 comprise the 6th waver 230 and the 6th adjustable resistor 231.

See also shown in Figure 2, first variable inductor 111 is composed in series by the inductor that 4 resistance values are 10 Ω, can obtain the resistance value of 10 Ω, 20 Ω, 30 Ω, 40 Ω respectively (because of rated current is 1A by the waver switching, corresponding load value is 10VA, 20VA, 30VA, 40VA, and following conversion method is all identical); Second variable inductor 121 is composed in series by the inductor that 10 resistance values are 1 Ω, switches the resistance value that can obtain 1 Ω, 2 Ω, 3 Ω, 4 Ω, 5 Ω, 6 Ω, 7 Ω, 8 Ω, 9 Ω, 10 Ω respectively by waver; The 3rd variable inductor 131 is composed in series by the inductor that 10 resistance values are 0.1 Ω, switches the resistance value that can obtain 0.1 Ω, 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω, 0.6 Ω, 0.7 Ω, 0.8 Ω, 0.9 Ω, 1 Ω respectively by waver; The 4th adjustable resistor 211 is made up of the resistor in series that 4 resistance values are 10 Ω, can obtain the resistance value of 10 Ω, 20 Ω, 30 Ω, 40 Ω respectively (because of rated current is 1A by the waver switching, corresponding load value is 10VA, 20VA, 30VA, 40VA, below all identical); Second adjustable resistor 221 is made up of the resistor in series that 10 resistance values are 1 Ω, switches the resistance value that can obtain 1 Ω, 2 Ω, 3 Ω, 4 Ω, 5 Ω, 6 Ω, 7 Ω, 8 Ω, 9 Ω, 10 Ω respectively by waver; The 3rd adjustable resistor 231 is made up of the resistor in series that 10 resistance values are 0.1 Ω, switches the resistance value that can obtain 0.1 Ω, 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω, 0.6 Ω, 0.7 Ω, 0.8 Ω, 0.9 Ω, 1 Ω respectively by waver.Using method:

The utility model Burden box uses wiring the same with other Burden box, but 2 points below must noting when using:

1) should measure tested secondary loop of mutual inductor resistance, instruments such as available impedance instrument or mutual-inductor tester (also available satisfy the multimeter that measuring accuracy requires) record, and this resistance value will be put in the Burden box real component and be deducted when several;

2) put and also should deduct corresponding idle component when several and put real component value additional when several carrying out real component.

Claims

1. the Burden box of power factor current transformer more than a kind is characterized in that: the idle component unit and the real component unit that comprise first binding post (Z1), second binding post (Z2) and series connection with it.

2. according to claim 1 a kind of many power factors current transformer Burden box is characterized in that: described idle component unit comprises the first load dish (11), the second load dish (12) and the 3rd load dish (13) of series connection; Described real component unit comprises the 4th load dish (21), the 5th load dish (22) and the 6th load dish (23).

3. as a kind of many power factors current transformer Burden box as described in the claim 2, it is characterized in that: the described first load dish (11) comprises first waver (110) and first variable inductor (111), the described second load dish (12) comprises second waver (120) and second variable inductor (121), and described the 3rd load dish (13) comprises triband switch (130) and the 3rd variable inductor (131); Described the 4th load dish (21) comprises the 4th waver (210) and the 4th adjustable resistor (211), described the 5th load dish (22) comprises the 5th waver (220) and the 5th adjustable resistor (221), and described the 6th load dish (23) comprises the 6th waver (230) and the 6th adjustable resistor (231).

4. as a kind of many power factors current transformer Burden box as described in the claim 3, it is characterized in that: described second binding post (Z2) is by triband switch (130) link described the 3rd variable inductor (131); Described the 3rd variable inductor (131) connects second variable inductor (121) by second waver (120); Described second variable inductor (121) connects first variable inductor (111) by first waver (110); Described first variable inductor (111) connects described the 4th adjustable resistor (211); Described the 4th adjustable resistor (211) connects described the 5th adjustable resistor (221) by the 4th waver (210); Described the 5th adjustable resistor (221) connects the 6th adjustable resistor (231) by the 5th waver (220); Described the 6th adjustable resistor (231) connects first binding post (Z1) by the 6th waver (230).

5. as a kind of many power factors current transformer Burden box as described in each in claim 3 or 4, it is characterized in that: described first variable inductor (111) is composed in series by the inductor that 4 resistance values are 10 Ω; Second variable inductor (121) is composed in series by the inductor that 10 resistance values are 1 Ω; The 3rd variable inductor (131) is composed in series by the inductor that 10 resistance values are 0.1 Ω; The 4th adjustable resistor (211) is made up of the resistor in series that 4 resistance values are 10 Ω; The 5th adjustable resistor (221) is made up of the resistor in series that 10 resistance values are 1 Ω; The 6th adjustable resistor (231) is made up of the resistor in series that 10 resistance values are 0.1 Ω.