Product Info

protective devices

 
protective devices  

Protective devices to guard against damage from lightning surges.

 
 
 

Intelligent breakers

 

Intelligent breakers

 

These are lightning proof breakers that can automatically reset when the breaker trips.

These products can be installed at the service entry point of power cables in unmanned electrical installations and other locations where maintenance is difficult, thereby helping to reduce maintenance costs.

 
 

Main performance features

 
Item Performance
Applicable breakers NFB, ELB
Rated capacity 50AF:5AT to 50AT
100AF:60AT to 100AT
Applicable voltage AC100V, AC200V (1φ2W, 1φ3W, 3φ3W)
Current sensitivity (ELB only) Capacity below 60A: 30mA
Capacity 60A or greater: 100mA
Automatic closing interval can be set as desired (flash, 1 min., 30 min., 60 min.)
Reclosing cycles: unlimited

(However, if the breaker is tripped six times within an eight hour period,

the automatic closing function will stop.)

Flash detection If the breaker is re-tripped within a short space of time (approx. 3 sec.) after automatic reclosing, the automatic reset function will stop.
Impulse protection level ≤1500V (1.2/50μs, 15kV applied at )
*Steel plate box type only.
Impulse current withstand capacity 8/20μs, 9kA (with arrester)
Withstand voltage 1.2/50μs 30kV (with arrester)
Alarm contact No-voltage A contact (contact capacity: AC200V, 2A)
Shape (1) Steel plate container type
(2) Plastic box container type
(3) Panel attachment type
(4) Single unit
Other Counter can be used to check number of automatic resets (0 to 9 or over displayed as L)
Controller (optional) can be used to add detailed functions (intermittent detection function).
 
 

Protective devices for electrical distribution station controllers DA type

 

配電子局制御装置用保安器 DA形

拡大

 

These protective devices are used to protect equipment such as switches installed on high voltage power distribution line poles and wattmeter control devices, from lightning surges and other types of irregular voltage.

 
 
 

Main performance features

 
 
Item Performance
Signal systems Telephone
Frequency bandwidth C, 16Hz, 0.3 to 150kHz DC, 16Hz, 0.3 to 3.4kHz
Irregular voltage protection performance AC Applied line voltage 300V or less
Residual voltage Between earths 300V以下
Between lines 10V or less 300V or less
Impulse   Applied voltage 1.2/50μs 10kV
Residual voltage Between earths Initial max. 1500V or less
During operation 20V or less
Between lines Initial max. 25V or less 1500V or less
During operation 10V or less
Current withstand AC 4A 2 sec.
Impulse 8/20μs 4kA
Transmission performance Operating attenuation 0.5dB or less 0.1dB or less
DC resistance 10Ω or less 10Ω or less
Withstand voltage between earths AC3KV 1 min., Impulse 1.2/50μs, 6kV
Between lines AC2KV 1 min., Impulse 1.2/50μs, 4kV
Insulation resistance 100MΩ or more at DC500V
 
 

Earth potential rise (reverse flashover prevention) protective devices

 
 

大地電位上昇用(逆閃絡防止用)保安装置

拡大

 

These devices protect human personnel and communication equipment cables in the event of substation earthing faults or earth potential rises due to lightning strikes. So that they can be installed in information transmission systems, these devices meet a wide range of requirements and have highly reliable protective performance.

 
 
 

Conditions for earth electropotential voltage rise

 

・Electrical power system faults cause fault current to enter electrical plant mesh earthing.
・Lightning surge current enters electrical plant mesh earthing due to lighting strike.

 
 

Protective device installation locations

Protective device installation locations
 
 

Main performance features

 
Item B-1 B-2a B-2b B-3a B-3b B-4
Application General telephone and DC signal communication lines Carrier lines (no DC superposition) Carrier lines (with DC superposition) PCM Carrier lines (no DC superposition) PCM Carrier lines (with DC superposition) INS net 64 lines (2W)
Transmission frequency  characteristics DC 16Hz, 0.3 to 3.4kHz 0.3 to 150kHz 0.3 to 150kHz DC 1.5MHz (PCM bandwidth) DC 1.5MHz (PCM bandwidth) DC 0.5 to 400kHz
Operating attenuation 1.5dB 1.5dB 1.5dB 1.5dB 1.5dB 1.5dB
Transmission level +10dBm +10dBm +10dBm 4Vo-p 4Vo-p +10dBm
Balancing 50dB or more 50dB or more 50dB or more 50dB or more 50dB or more 50dB or more
Crosstalk attenuation 70dB or more 70dB or more 70dB or more 70dB or more 70dB or more 70dB or more
Impedance 600Ω±20% 150Ω±20% 150Ω±20% 110Ω±20% 110Ω±20% 110Ω±20%
DC resistance 60Ω or less - 60Ω or less - 60Ω or less 60Ω or less
Follow current shut-off voltage - current DC60V, 100mA (single wire) DC60V, 100mA (single wire) DC60V, 100mA (single wire) DC60V, 100mA (single wire) DC60V, 100mA (single wire) DC60V, 100mA (single wire)
Reverse flashover prevention current 0.2A or less 0.2A or less 0.2A or less - 0.2A or less 0.2A or less
Current withstand AC 4A, 2 sec. (single wire 2A) 4A, 2 sec. (single wire 2A)  4A, 2 sec. (single wire 2A)  4A, 2 sec. (single wire 2A) 4A, 2 sec. (single wire 2A)  4A, 2 sec. (single wire 2A)
Impulse 8/20μs 4kA (single wire 2kA) 8/20μs 4kA (single wire 2kA) 8/20μs 4kA (single wire 2kA) 8/20μs 4kA (single wire 2kA) 8/20μs 4kA (single wire 2kA) 8/20μs 4kA (single wire 2kA)
Basic circuit diagram Basic circuit diagram Basic circuit diagram Basic circuit diagram Basic circuit diagram Basic circuit diagram Basic circuit diagram
 

Examples of protective device external view and internal plan

 
Examples of protective device external view and internal plan

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