Unit Type Fault Selective Equipment

 

 

At DC electrified section, this equipment judges the difference of the current changes between the load current of rolling stocks and the fault current caused by short circuit faults such as feeder breaking etc., and opens a circuit breaker only when it detects the fault current that causes fire of rolling stocks etc.
Our Fault Selective Equipment has been installed in DC electrified substations in
Japan since 1961. This Unit type is the latest microprocessor model. You can set up the equipment only by inserting required units for the required number of feeders, which saves unnecessary units. Further, we offer an optional printer unit to reproduce the detected fault current waveform.
This Unit Type Fault Selective Equipment contributes to the safe operation at DC electrified section of JR company, private railway companies and publicly owned railway companies.
Japan Patent Nos: 1079654, 1812134, 2050460, 2539178

 

 

MEFH-UW type

 

MEFJ-U type

 

 

Type

MEFH-UW

MEFH-U

MEFJ-U

MEFK-U

Protecting Number of Feeders

1 - 2

1 - 5

1 - 5

1 - 5

Z feeder Changeover

 

Section Compensation

Opposite50%

Opposite50%

Opposite50%

Opposite50%

MPU control Substation-ready

 

 

Dual System

 

Setting Range

1000A - 4000A

Delta I Current Setting

Can be set at intervals of 200A

Delta I Current Display

Max delta I value by load or fault current

Printer

(option)

Construction

Panel Mounting Type

Accuracy

2.5% of setting value

Power Supply

DC 100V

 

 

 

Fault Detector for Fault Selective Equipment

 

 

DF-8C type

 

DHT-1C type

 

 

Type

DF-8C

DF-8CS

DHT-1C

DHT-1CS

Detecting Method

Coil + Hall Element

Dual System

 

 

Current Detecting Function

 

 

Accuracy

1.5%

Construction

Installing type (divided at installation)

Power Supply

Supplied by Power Supply Unit of Fault Selective Equipment

Rating

4000A

* DHT-1C and DHT-1CS have built-in Hall Generator type Current Detector (HF-20D type, rating: 20kA).

 

 

 

 

 

Transfer Trip Equipment

 

 

At DC electrified section, electric power is supplied to a rolling stock by substations on both sides in parallel. If fault current is detected because of feeder line fault etc., power supplies from both substations should be cut off.
This equipment is installed in substations on both sides and communicates mutually when a fault occurs, and opens a circuit breaker to cut the power supplies from both substations; consequently, prevents the fault from expanding and exacerbating.
This Transfer Trip Equipment cooperates with the Fault Selective Equipment and ensures the safety of feeding at DC electrified section. In addition, it keeps on communicating each other while the fault continues, and re-closes the circuit breaker automatically when the fault ends. In this way, this equipment contributes to an early recovery of train service.

 

 

HR-22 type

 

 

Type

HR-11A

HR-12A

HR-21

HR-22

HR-32

Re-closing Function

 

 

 

DC Locator-ready

 

 

 

Communication Speed

300bps

1200bps

300/1200bps

Communication Cable Monitoring

Continuous Monitoring

Transmission Distance

Max. 20km

Communication Form

Opposite, 3 point Communication, Extension Communication

3 Point Communication

Feature

Communication level can be changed, Smallest Size in the industry

Construction

Panel Mounting Type

Power Supply

DC 100V

*1

:

Communication method: 2 wires, full duplex method

*2

:

Carrier type Transfer Trip Equipment (Separate type: Communication, Re-closing and Monitoring Units are separated.) is available.

 

 

 

 

 

Reverse Current Relay

 

 

In substations at DC electrified section, a rectifier is installed to change received alternating current into direct current. This Reverse Current Relay detects the reverse current caused by a fault of rectify element inside the rectifier etc., and cuts the current of both AC receiving and DC rectifying sides of the rectifier. In this way, this relay not only protects the rectifier but also prevents the fault from spreading to a serious short circuit fault at feeder circuit.

 

 

XRC-5/YRC-8 type

 

XRC-6/YRC-10 type

 

 

Relay Type

XRC-5

XRC-6

Detector Type

YRC-8
(Indoor use)

YRC-9
(Outdoor use)

YRC-10
(Indoor use)

YRC-11
(Outdoor use)

Detecting Method

Hall element

Dual System

 

Minimum Operating Current

-500, -1000A

-1000A

-500, -1000A

-1000A

Detecting Accuracy

30%

20%

Construction

Relay: Panel mounting type, Detector: Installing type (divided at installation)

Power Supply

DC 100V

 

 

 

 

 

DC Voltage Detecting Relay

 

 

Because DC substations have complex compositions, even if a circuit breaker is open, voltage may be impressed by current wrap-around etc. To prevent electric shocks to human beings during track works, it is necessary to monitor the actual voltage impressed on the feeder line.
This DC Voltage Detecting Relay monitors the feeding voltage on the feeder and helps the safer track works.
Particularly, YFV-3B type can make a non-contact detection of the voltage. This is the first equipment in the industries.
Utility model No: 2563126 (YFV-3B type)
Won the OHM Technology Award in 1996 (YFV-3B type)

 

 

Relay Type

YFV-1

YFV-3B

Input Impedance

100M

Non-contact type Separation: 60 - 100mm

Construction

Installing type

Power Supply

DC 100V

Rating

1500V, Operating Voltage 1000V

 

 

YFV-3B type