Concentric Neutral Tester
The Ω-CHECK? tester is designed to measure how many strands remain of a concentric neutral. The instrument consists of a variable 48 volt AC power supply, a microprocessor based programming, control, and acquisition module, a “clamp-on” current meter, and two 500’ reels of two-conductor test lead for connecting to the Local and Remote ends of the neutral being tested: one wire pair is used to inject the current through the neutral and the other pair is used to measure the voltage across the neutral. The AC power supply injects a current up to 30 amperes into the total ground system. The current probe placed around the neutral tested measures the current flowing only in that neutral.
The acquisition module receives the voltage across and the current through the tested neutral, from which the resistance and power factor are computed. Relays are used to swap the test current between polarities to help compensate for neutral load current effect. From the cable’s neutral data previously entered into the controls, the system computes, compares, and displays the % of the neutral remaining, and other valuable data.
Electrical
Input Power: 1800 VA, 120 V @ 60 Hz, 15 A max.
Output Power: 0-48 VAC, 30 A max.
Instrumentation
Current Probe: Output: 1000:1
V&I Meters: Accuracy: ±2%
V&I Measured: Accuracy: ±1%
Phase Angle – P.F.: ±1.5?
Environmental
Temperature
Operating:
0 to 45?C, 0 to 113?F
Storage: -20? to 70?C, -5? to 158?F
Humidity: 85% noncondensing
Dimensions & Weight
Control box: 20”w x 12”d x 19”h, 55 lbs
Cable reels (ea.): 12”w x 11.5”d x 14.75”h, 23 lbs
Cables & Accessories: Supplied in canvas HVI bag
中性点电阻测试仪Ω-Check
特色和优点
Ω-Check同心中性电阻测试仪(型号OCK-30)是有特点的和有用的。它通过带电电缆中性线注入交流电流并测量电压降以计算该中性线的电阻。根据以前测试电缆的数据,机器将测量数据与完好电缆的数据进行比较,以确定中性劣化的程度,或已打开多少同心中性线。
端到端的中立有多好?
同心中性线由多股圆形或扁平线构成,螺旋缠绕在电缆绝缘层上,通常在两端接地。如果中性线已经腐蚀到无法再承载返回和/或故障电流的程度,则可能会出现严重问题。可能导致其他问题,例如杂散电压和电压波动,以及诊断测试的障碍,例如VLF-TD和VLF-PD。在考虑电缆再生(注入)之前,必须确保中性完整性。
用于Ω-Check测试仪
- 测试中性线的完整性,以承载返回和故障电流
- 在进行电缆注入之前测量中性完整百分比
- 在tan delta和局部放电测试之前检查中性线
- 减少电压波动和不正确的继电器操作
- 通过查找和替换不良中性物来减少电击危险
- 在故障定位电缆之前确认存在连续中性线
- 测量变电站接地电缆的电阻
产品规格
型号OCK-30
输入: | 120 V AC @ 15 A,60 Hz |
---|---|
输出: | 0-48 V RMS,0-30 A RMS |
措施: | V,I,R(Ω) R(Ω/?? 100’) %中性完整 功率因数 |
数据导出: | 面板上的SD卡 |
输出终止: | 两个500’卷轴 |
同心中性测试器
Ω-检验测试仪被设计用来测量一个同心中性线有多少个股线。该仪器由48伏交流电源、基于微处理器的编程、控制和采集模块、“箝位”电流表和两个500卷双导体测试引线组成,用于连接被测试中性线的本地和远程端:一对导线。用于向中性点注入电流,另一对用于测量中性点两端的电压。交流电源在总接地系统中注入高达30安培的电流。放置在被测中性点周围的电流探头测量仅在中性点流动的电流。
采集模块接收被测中性点之间的电压和电流,从中计算电阻和功率因数。继电器用于在极性之间交换测试电流,以帮助补偿中性负载电流效应。从先前输入到控件中的电缆的中性数据,系统计算、比较并显示剩余的中性数据的%和其他有价值的数据。
电气
性能
输入功率:1800 VA,120 V @ 60 Hz,15 A。
输出功率:0~48伏,最大值30。
仪器仪表
电流探头:输出:1000∶1
V&I米:精度:±2%
V&I测量:精度:±1%
相位角P.F:±1.5
环境
温度
操作:
0~45℃,0~113μF
贮存:- 20℃~70℃,- 5℃~158℃
湿度:85%不凝结
尺寸和重量
控制盒:20“W×12”D×19“H,55磅
电缆卷筒(EA):12“W×11.5”D×14.75“H,23磅
电缆及附件:帆布HVI袋