Earth fault protec�on system with voltage limi�ng devices TZD/EZZ assures that earth-faults in the area of substa�on, power supply HV cables and rail trac-�on are switched-off. Thus, proper level of protec-�on against impermissible touch voltages and limita-�on of stray current down to minimum values is achieved. Voltage limi�ng device TZD connected between substa�on earthing and cooper shield of HV cables eliminates electrical connec�on (bond) between railway, tramway and subway through powering system. Thyristor overvoltage limiter TOP improves working condi�ons of high speed circuit breaker HSB. All devices manufactured by KOLEN are marked in the figure above.

TZD VOLTAGE LIMITING DEVICE

Since year 1992, KOLEN is leading manufacturer of all kinds of instrumenta�on dedicated to earth-fault protec�on in DC railway trac�on system and instrumenta�on dedicated to limit stray-currents in the whole supply network. Based on the extensive experience, KOLEN offers also technical consultancy services in the field of earth-fault protec�on and all kind of issues related to stray-current limita�on.

KOLEN SOLUTIONS FOR THE EARTH-FAULT PROTECTION SYSTEM

Protected object

SUBSTATION

TOZ IMR

TOZ IMR

TCKRK

TOZEZZ

TWS TOP

HVB

TZD-1NR

TZD-1NRTZD-1NR

TZD-1NR

+3kV

HSB

HV

BUSBAR

K O L E N . P L S p ó ł k a z o g r a n i c z o n ą o d p o w i e d z i a l n o ś c i ą S p . k .0 5 - 0 9 1 Z ą b k i , 8 a B r a t n i a s t r , P o l a n d

P h o n e : + 4 8 2 2 7 6 2 8 4 4 4w w w . k o l e n . p l

E A R T H - F A U L T P R O T E C T I O N S P E C I A L I Z E D T E S T E R S A N D M E A S U R E M E N T I N S T R U M E N T S

K O L E N . P L S p ó ł k a z o g r a n i c z o n ą o d p o w i e d z i a l n o ś c i ą S p . k .0 5 - 0 9 1 Z ą b k i , 8 a B r a t n i a s t r , P o l a n d

P h o n e : + 4 8 2 2 7 6 2 8 4 4 4w w w . k o l e n . p l

E A R T H - F A U L T P R O T E C T I O N S P E C I A L I Z E D T E S T E R S A N D M E A S U R E M E N T I N S T R U M E N T S

Voltage limi�ng devices TZD-1NR are designed for open connec�on between running rails and common buildings (railway support, bridges, viaducts). Volta-ge limi�ng devices assure that earth-faults and short circuits between catenary and protected objects are switched-off. Nominal voltage threshold level is 120 V for rail trac�on, 60 V for tram trac�on (TZD-1NR/T) and others. Patent Nr 170994.

TOZ TESTER OF VOLTAGE LIMITING DEVICESTester of voltage limi�ng devices TOZ is designed for

test and verifica�on of TZD devices. All func�onal test can be perfor-med without powering-off the trac�on system. TOZ is portable,

enclosed in a case and powe-red from internal ba�ery. Tester TOZ can be also

used for tripping tes�ng of earth-fault protec�on devices

EZZ and its predecessor TUZZ.

IMR IMPULSE METER OF RESISTANCEIMR meter is dedicated to earth electrode resistance measurements in the vicinity of DC railway trac�on

systems. Unique measurement method eliminates impacts of induc-tance, DC voltage level and harmo-

nics of power supply network on the measurement result, which is

a huge advantage compared to commonly used measurement

equipment. Measurement can be performed with only two electrodes

(when current probe resistance is known, i.e. railway or tramway running rails, sta�on earthing) or with three electrodes when the third electrode acts as reference earth. IMR meter is ba�ery powered. Patent Nr 199600, Cer�ficates IEL Nr Z/1460/0001/2010 and N/1460/0001/2010.

TCK RETURN CABLE CONTINUITY TESTERReturn cable con�nuity tester TCK installed in the trac�on substa�on monitors the resistance of the circuit consis�ng of: substa�on earthing resistance, rail to earth resistance and return cables resistance. Exceeding the threshold resistance value causes either no�fica�on or powe-ring-off substa�on depen-ding on the value of the resistance. In most prac�cal situa�on, too high resistance indicates broken return cables. Patent Nr 171001.

TWS-6000 TESTER OF HIGH SPEED CIRCUIT BREAKERS

High speed DC circuit breaker tester TWS is designed for inspec�ons of overcurrent tripping release se�n-gs, making capability, switch-off �me and main contact resistance of High Speed DC Circuit Breakers. Op�onally, it can also be used for tes�ng of relays and current sensors. Ba�ery of supercapacitors is used as the energy source. Power consump�on from 230 VAC supply network is up to 2 kVA, output current is up to 6000 A, weight 50 kg. Patent Nr 206036. Cer�ficate IEL Nr 0788/NBR/2010.