DB43-T 2357-2022 宽负载电流互感器通用技术规范

ICS

17.220CCS

L

43湖 南 省 地 方 标 准DB43/T

2357—2022宽负载电流互感器通用技术规范Technical

specification

for

wide

load

current

transformers2022

-

05

-

06

发布

2022

-

-

实施湖南省市场监督管理局

发

布DB43/T

— 前言························································································································

Ⅲ1

·····················································································································

12

规范性引用文件······································································································13

术语与定义············································································································14

技术要求···············································································································14.1 额定绝缘水平···································································································14.2 额定输出·········································································································24.3 额定准确级······································································································24.4 额定一次电流标准值··························································································

34.5 额定二次电流标准值··························································································

34.6 额定连续热电流标准值·······················································································

34.7 短时电流额定值································································································

34.8 设计和结构······································································································35

试验方法···············································································································35.1 一次端工频耐压试验··························································································

35.2二次端工频耐压试验··························································································

45.3准确度试验······································································································45.4 温升试验·········································································································45.5 短时电流试验···································································································45.6 一次端冲击耐压试验··························································································

45.7 局部放电试验···································································································45.8 匝间过电压试验································································································

46

检验规则···············································································································56.1 出厂检验·········································································································56.2 型式检验·········································································································5附录

A（规范性） 试验项目·························································································

6DB43/T

2357— 本文件按照

GB/T

—2020《标准化工作导则第

1

部分：标准化文件的结构和起草规则》的规定起草。请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别专利的责任。本文件由湖南省市场监督管理局提出并归口。公司、国网怀化供电公司、中铁检验认证株洲牵引电气设备检验站有限公司娟、周卫、蒋海洲、王兵初、向建安、张随涵、刘鼎、

胡夏颖、罗颖、张鹤祥、朱舟、李思颖、宋慧琦。IIIDB43/T

2357—1

本文件规定了供电气测量仪表使用、频率为

Hz〜100

Hz

的新制造的电磁式宽负载电流互感器的术语和定义、技术要求、试验方法和检验规则。本文件适应于测量用电磁式宽负载电流互感器的出厂检验及型式检验。2

规范性引用文件文件。GB/T

标准电压（

156—2007，

60038：2002，）GB

311.1 绝缘配合第

1

GB

311.1—2012，

：2006，）GB

20840.1—2010 互感器 第

1

:通用技术要求（

：2007，MOD）GB

20840.2—2014 互感器 第

2

:电流互感器的补充技术要求3

术语与定义GB

20840.2—2014

中界定的以及下列增补的术语和定义适用于本文件。宽负载电流互感器 wild

宽负载电流互感器是指含有两个绕组的

，可以根据负载的实际情况自动识别适合运行的变比，保证电流互感器的计量范围从变压器负载的

％〜150％均能满足相应准确度要求的测量用电流互感器。4

技术要求4.1 额定绝缘水平4.1.1 对于标称系统电压

U≤1000

kV

的电流互感器的一次端额定绝缘水平应以

20840.1—2010

表

2所列的设备最高电压

U（或

U）为依据。运行时拟接地一次端子的绝缘水平按

U为

0.66

kV

选取。对于无一次绕组和本身无一次绝缘且标称系统电压

U≤0.66

kV

的电流互感器，其一次绕组的额定绝缘水平以系统标称电压

U为依据。系统标称电压

U见

GB

。系统标称电压为

1000

kV

的电流互感器的一次端额定绝缘水平应按照

的规定。4.1.2 地屏对地绝缘要求对设备最高电压为

U≥40.5

kV

crad0.2201001201500.2201001201500.2201001201500.2S0.750.750.350.20.20.20.2303015101010100.90.90.450.30.30.30.30.5S1.51.50.750.50.50.50.5909045303030302.72.71.350.90.90.90.9DB43/T

—工频耐受电压

5

kV4.1.3 二次端绝缘要求二次端绝缘能承受额定工频耐受电压

3

4.1.4 匝间绝缘要求绕组匝间绝缘的额定耐受电压应为

4.2 额定输出不超过

30

VA

的各测量级的额定输岀的标准值为：2.5

VA、

VA、10VA、

VA、20

、

VA

和

VA超过

VA

的数值可以按用途选择。注：额定输出可以规定为非标准值，但要求符合另一个标准的准确级。4.3 额定准确级4.3.1 测量用电流互感器准确级的标称分数来标称的。4.3.2 标准准确级测量用宽负载电流互感器的标准准确级为：

S

和

0.5

S。4.3.3 测量用电流互感器的比值差

ε

和相位差限值对于

S

级和

S

级，在二次负荷为额定负荷的

0.2％〜％之间任一值时，其额定频率下的比值差和相位差应不超过表

1

所列限值。

0.8

5

1.0，且最低值为

1

。

所要求的空气绝缘间距时，规定的表

1表

1测量用互感器的比值差和相位差限值准确级

0.2

S

S

级的电流互感器可以标有扩大电流额定值，但要满足下列两点要求：a）

额定连续热电流应是额定扩大一次电流；DB43/T

—b）

额定扩大一次电流下的比值差和相位差应不超过

4.3.3

要求。额定扩大一次电流应表示为额定一次电流的百分数。4.4额定一次电流标准值额定一次电流标准值为：

A、12.5

A、15

A、20

A、25

A、30

A、40

A、50

A、60

A、75

A

及其十进制倍数或小数。有下标线者为优先值。4.5 额定二次电流标准值额定二次电流标准值为

1

A

和

5

A。对于暂态特性保护用电流互感器，额定二次电流标准值为

1

A。4.6 额定连续热电流标准值额定连续热电流的标准值为额定一次电流。当规定的额定连续热电流大于额定一次电流时，其优先值为额定一次电流的

120％、150％

和2004.7 短时电流额定值4.7.1 额定短时热电流（Ith）对互感器应规定额定短时热电流（I）。额定短时热电流的持续时间标准值为

1s。4.7.2 额定动稳定电流（I）额定动稳定电流（I）的标准值是额定短时热电流（I）的

2.5

4.8 设计和结构宽负载电流互感器设计和结构符合

—

的

6

要求外，还应在铭牌上标注以下信息：a）

b）

在准确级后标出适用的负载电流范围。

5

试验方法5.1一次端工频耐压试验一次端工频耐压试验按照

GB

20840.1—2010

的

进行。果

GB

—2010

表

2

为

60

s。系统标称电压为

1

的电流互感器，试验电压按

GB

311.1

5

。

4.1.2

地屏与地之间，持续时间为

60

s。0.2S

0.5S

0.2％；20DB43/T

—5.2二次端工频耐压试验一次端工频耐压试验按照

GB

20840.1—2010

的

进行。按照

4.1.3

规定的试验电压应依次施加到端子短接的各绕组间及各绕组与地之间，持续

60s。5.3 准确度试验为验证是否符合

4.3.3

的要求，准确度试验应在规定额定负荷范围的最高值和最低值下按照表

2所列的每一电流值分别进行。表

2表

2电流互感器误差测量区间按照

—2014

的

7.2.2

内容进行试验。5.5 短时电流试验按照

—2014

的

7.2.201

内容进行试验。5.6 一次端冲击耐压试验按照

—2014

的

7.2.3

内容进行试验。要求

接地）以及所有二次绕组端子均应接地。对于气体绝缘变电站的三相电流互感器，应依次对每一相进行试验。一相试验时其余相接地。对于气体绝缘金属封闭式互感器，其验收准则参见

GB

7674。系统标称电压为

1000

kV

的电流互感器的试验电压应按照

GB

311.1

的规定。5.7 局部放电试验按照

—2010

的

7.3.3

内容进行试验。5