接地故障继电器


  • SE-601

  • 可在从工业24- Vdc控制电路到1000-Vdc太阳能电路的不接地直流系统中运行……更多

  • 工作
    电压
    (VAC):
     120 - 240

  • 工作
    电压
    (VDC):
     12-30, 40 - 55, 100 - 240

  • 继电器
    触点:
     一个Form A触点(常开),一个Form B触点(常闭)

  • EL731

  • 可在交流电阻接地系统和直流接地系统中运行。 EL731是一款基于微处理器的……更多

  • 工作
    电压
    (VAC):
     120/240, 24

  • 工作
    电压
    (VDC):
     120/240, 120/ 240, 48, 24

  • 继电器
    触点:
     三路继电器C型(常开/常闭)

  • SE-701

  • 可在交流直接接地和交流电阻接地系统中运行。 SE-701是一款基于微处理器的……更多

  • 工作
    电压
    (VAC):
     24, , 120/240

  • 工作
    电压
    (VDC):
     12-24, 48, 120/240

  • 继电器
    触点:
     一个Form A触点(常开),一个Form B触点(常闭)

  • SE-703

  • 可在交流直接接地和交流电阻接地系统中运行。 SE-703是一款基于微处理器的……更多

  • 工作
    电压
    (VAC):
     24, , 120/240

  • 工作
    电压
    (VDC):
     12-24, 48, 120/240

  • 继电器
    触点:
     2个C型、一个A型(常开);一个B型(常闭)

  • SE-704

  • 可在交流直接接地和交流电阻接地系统中运行。 SE-704是一款基于微处理器的……更多

  • 工作
    电压
    (VAC):
     24, , 120/240

  • 工作
    电压
    (VDC):
     12-24, 48, 120/240

  • 继电器
    触点:
     一个Form A触点(常开),一个Form B触点(常闭)

  • PGR-4700

  • 可在交流直接接地和交流电阻接地系统中运行。 PGR-4700敏感型接地故障……更多

  • 工作
    电压
    (VAC):
     120, 24, 240

  • 工作
    电压
    (VDC):
     24

  • 继电器
    触点:
     2路继电器 C型(常开/常闭)

The primary purpose of grounding electrical systems is to provide protection against electrical faults. However, this was not common practice until the 1970’s. Until then, most commercial and industrial systems were ungrounded. Although ungrounded systems do not cause significant damage during the first ground fault, the numerous disadvantages associated with ground faults resulted in a change to the grounding philosophy. There are other advantages for a grounded system, such as reduction of shock hazards and protection against lightning. Electrical faults can be divided into two categories: phase-to-phase faults and ground faults. Studies have shown that 98% of all electrical faults are ground faults (Source: Woodham, Jack, P.E. “ The Basics of Grounding Systems”. While fuses can protect against phase-to-phase faults, additional protection, such as protection relays, are typically required to protect against ground faults.