DC Filter with Current Limiting Reactor（Q－Ｆℓ）The device that suppresses harmonics generated by rectifiers in DC
feeding substations.
It is equipped with a series reactor which properly limits excessive fault
current in any current range.

Current Limiting Reactor
SR-Tr

SR

89N

DCL : Series Reactor
L: Reactor for resonance: Capacitor
CDR : Discharge resistor

FLB
Q-FL

C

DCL

Filter

HSCBDRL
FilterFeeder

DC Filter With Current Limiting Reactor (Ｑ－Ｆ ℓ )RailCurrent-limiting reactor (Q-SL) maintains an inductanceof 1.2 mH up to the rated current range, as indicated in
the former JRS, while ensuring 0.5 mH at any high current,
thereby contributing to reliable interruption of fault
current in DC high-speed circuit breakers and reduce theload on substation equipment such as rectifiers.

Iinductance(mH）frequency of breakdowns:Many failure frequency: Low(equipment ground fault,(train accident,etc.)
short circuit, etc.)

fault current
1.2ｍH

current limiting reactor (Q-SL)
1.20.5ｍH

air core typereactor

0.5inductanceiron core reactorwith gap(former JRS)

0.100rated current value
current (A）Purpose and role of the device
In recent years, there has been a tendency for large currents with steep rise to flow
during low-resistance ground faults near substations due to the effects of lower
impedance rectifiers, such as larger substation capacities and lower regulation ratios
for the purpose of utilizing regenerative power effectively. Under such circumstances,
the series reactor shall be effective to suppress excessive current so that the DC highspeed circuit beaker in the substation can be properly perform its breaking functionagainst the fault current in any current range.

FeaturesThis system is equipped with the series reactor which can secure more than 0.5mH
when a large fault current flows, and can maintain a high inductance value even when arated current or fault current (such as train accident) similar to rated current flows.
As main objective of this system, this suppresses the harmonics generated by the rectifier.
In addition, Current Limiting Reactor have the function of slowing down abrupt current
changes, so they can be installed as a substitute for resistors used for short-circuit
protection in power storage systems for electric railways, thereby contributing to energy
conservation.

Configuration
This DC Filter(Ｑ－Ｆ ℓ ) consists of the filter panel on which the resonant circuit
equipment is mounted and the series reactor. Upon request, DC ground fault protective
relay(64P) and DC feeding voltage measuring equipment(DCVT) can be installed in thefilter panel.

Maintainability
All equipmentin the resonant circuit is dry self-cooled and mounted in the filter panel
適切なインをダクタンス値
separatelyの確保 from the series reactor, making it easy to perform maintenance and repairs.

Reducing environmental impact
The oil-filled self-cooled series reactor uses a vegetable oil system with rapeseed oil as
the base oil to reduce the environmental impact. The vegetable oil-based insulating oil
has an extremely high flash point and is safe to use. (Dry self-cooling type is alsoavailable)

Primary circuit rated voltage

Resonant circuit

Series Reactor

DC 1500V

Commercial
frequency

50Hz

60Hz

Resonance
frequency

600Hz

720Hz

Resonance
reactor

0.440mH

0.305mH

Capacitor

160μF

Circuit current

35AInductance

0.9 ～ 1.1mH At rated current
When iron core is saturated 0.5mH（Minimum）

Rated current

2000A

4000A

6000A

Dimensions(Oil-filled self-cooling)

W：1750mm
D：2250mm
H：2950mm

W：2000mm
D：2550mm
H：3050mm

W：2100mm
D：2650mm
H：3200mm

Weights(Oil-filled self-cooling)

Approx.
6000kgApprox.
10000kg

Approx.
13000kg