NAZJX變壓器變比整檢校驗裝置

產品別名

變檢，變比整檢裝置，變壓器檢驗裝置，變比校驗裝置，全自動變比整檢測試系統(tǒng)，變壓器變比校驗裝置，變壓器變比整檢校驗裝置，南澳電氣變比整檢裝置

一、（1）設備概述 南澳電氣專業(yè)生產NAZJX變壓器變比整檢校驗裝置變檢

“NAZJX變壓器變比整檢裝置”（簡稱“變檢”）是用來檢定0.1級及以下變壓器變比測試儀的變比精度和分辨率的一種裝置，同時可以檢定變比組別測試儀在組別測試時的變比精度和各種組別選擇的正確性，并包括Z形組別。

（2）原理結構

儀器中A、B、C分別為三相輸入，接變比測試儀的一次側，a、b、c為三相輸出，接變比測試儀的二次側。功能開關是功能選擇開關，可選擇四種功能的測量。選擇開關在組別選擇時使用，該開關具有三相PT的不同組別的選擇功能，同時還可選擇Z形組別。X、Y、Z、x、y、z、a，、b，、c，、x，、y，、z，是在檢定本裝置的標準變比PT和標準三相PT的準確度時使用，除此之外，沒有其他用途，但相互不能短接。

二、使用方法

使用時A、B、C、a、b、c與變比組別測試儀的相應端子連接，A、B、C為一次輸入電壓端鈕，a、b、c為二次輸出電壓端鈕。功能選擇開關具有4種功能選擇，當它置于某一功能檔時，“變檢”就只能對變比組別測試儀的這一功能進行測試。

K1、K2為組別選擇開關，K2、K3為Z形組別選擇開關，根據面板上給出的“組別開關選擇表”有關K1、K2、K3中的數(shù)值來確定此時所選擇的組別狀態(tài)。

分辨率選擇開關有兩種，即小數(shù)點后兩位數(shù)和三位數(shù)的選擇。當作分辨率測試時，所顯示的小數(shù)部分應是標準值與倍率的乘積，兩部分小數(shù)可以相互迭加，而整數(shù)部分始終顯示25。

三、性能指標

1. 變比測試功能

可預置的標準變比值是：220/110、220/35、220/10、220/6、110/35、110/10、110/6、35/10、35/6、35/0.4、10/10、10/6、10/0.4、6/0.4、27.5/0.4、27.5/6、24/6、110、550、1100（共20個）即：UAB/Uab的值有上述20種選擇，此時，UAB的額定電壓為400V，該裝置可在額定電壓的20%～120%內工作，二次電壓Uab可以承擔大于等于100KΩ的負荷，即要求被試變比測試儀的二次輸入阻抗≥100KΩ，此時的標準變比值的誤差小于0.02%。

2. 分辨率測試功能

當功能選擇開關置于“分辨率”時，可測試變比測試儀所顯示值的分辨率，“變檢”可預置25.001、25.002、……25.099共99個值，供測試各種變比測試儀的分辨率時使用，在分辨率測試時，對誤差不作要求，但檢定變比測試儀分辨率時，變比測試儀的顯示值應該隨分辨率的增減有明顯的變化。

3. 組別測試功能

“變檢”將標準三相PT按一次星形、二次星形或三角形和一次三角形、二次星形或三角形接法組成12種組別，可對變比組別測試儀的全部組別進行測試，同時在組別測試時的變比值可有25（10/0.4）、87.5（35/0.4）、1050三種選擇，其組別測試時的標準三相PT的各單相誤差全部小于0.1%。

4. Z形組別測試功能

Z形組別共有10組（△/Z或Y/Z），其它性能指標與上述的“組別測試功能”*相同。

5．直通測試功能

該功能是將變比測試儀的一次電壓UAB直接連接于二次端（a、b端）即UAB=Uab，可對變比測試儀進行1/1的自校，注意不能在不允許直通的變比測試儀的檢定中使用。

NAZJX transformer variable ratio of entire inspection device

Variable ratio checking device, transformer testing device, variable ratio testing device, variable ratio checking device

Overview of NAZJX

"NAZJX transformer ratio of the entire inspection device" (referred to as "variable") is used to test 0.1 and below transformer ratio tester than the accuracy and resolution of a device, and can test variable ratio group tester In the group test when the variable ratio accuracy and the accuracy of various groups of choice, and includes Z-shaped group.

First, the principle of structure

Instrument A, B, C, respectively, for three-phase input, junction ratio of the primary side of the tester, a, b, c for the three-phase output, connected to the secondary side of the tester. Function switch is a function selector switch, you can select the four functions of the measurement. The selector switch is used for group selection. This switch has a selection function for different groups of three-phase PTs, and a Z-shaped group can be selected. X, Y, Z, x, y, z, a ,, b ,, c ,, x ,, y ,, z, is used in verifying the accuracy of the standard transformation PT and the standard three- In addition, there is no other purpose, but not short of each other.

Second, use range of this tester

When used, A, B, C, a, b, c and variable ratio group tester connected to the corresponding terminal, A, B, C for the input voltage side button, a, b, c for the secondary output voltage side button. Function selector switch has four kinds of function selection, when it is placed in a function file, the "variable inspection" can only change the ratio of the group tester to test this function.

K1 and K2 are the group selection switches, and K2 and K3 are the Z group selection switches. The groups selected at this time are determined by the values in K1, K2 and K3 according to the "group switch selection table" given on the panel Do not state.

There are two resolution selection switches, that is, after the decimal point of two digits and three digits of choice. As a resolution test, the fractional part of the display should be the product of the standard value and the magnification, the two parts can be superimposed on each other, and the integer part always shows 25.

Third, performance indicators

1. Variable ratio test function

The presettable ratio values are:

220/6, 220/10, 220/6, 110/35, 110/10, 110/6, 35/10, 35/6,35/4, 10/10, 10/6, UAB / Uab value of the above-mentioned 20 kinds of options, this time, UAB rated voltage of 400V (1), UAB / , The device can work in the rated voltage of 20% to 120%, the secondary voltage Uab can bear 100KΩ or more load, which requires the test variable ratio tester secondary input impedance ≥ 100KΩ, then the standard variable ratio Of the error is less than 0.02%.

2. Resolution test function

When the function selector switch is set to "Resolution", it can test the resolution of the value displayed by the ratio tester, and the "check" can preset 25.001, 25.002, ... 25.099, 99 values ??for testing various variable ratio When the resolution of the tester is used, the error is not required in the resolution test, but when the test is changed to the resolution of the tester, the display value of the ratio tester should change obviously with the increase or decrease of the resolution.

3. Group test function

"PT" will be the standard three-phase PT by a star, the second star or triangle and a triangle, the second star or delta connection composed of 12 groups, variable ratio group tester can be all groups , And the test values ??of the standard three-phase PTs are 25 (10 / 0.4), 87.5 (35 / 0.4), 1050 respectively. The single-phase errors of the standard three-phase PTs are all less than 0.1%.

4.Z-shaped group test function

There are 10 groups (△ / Z or Y / Z) in the Z-shaped group. The other performance indexes are the same as the above "group test function".

5. Through test function

This function is to connect the primary voltage UAB of the ratio tester directly to the secondary end (a, b terminal), that is UAB = Uab, can carry on the 1/1 self-calibration of the variable ratio tester, pay attention not to Variable ratio test instrument used in the test.