High-Impedance Differential Protection Relay Block 7VH60A

Function :-
1. Robust static design
2. Auxiliary DC supply monitor
3. Fast operating time (15 ms)
4. Simple pickup voltage setting by resistors through shorting links
5. LED alarm indicator
6. Option “Bus-wire alarm” (supervision)
7. Option “Blocked external”by binary input
8. Wide-range auxiliary power supply
9. Latched trip contact (lockout function). Reset by binary input.
10. Adjustable max. voltage pickup setting by a jumper between 60 V or 240 V

This High-Impedance Differential Protection Relay Block is easily insert in your schematic diagram and connect as you like way.

The relatively simple electronic design of the 7VH60A provides a robust and reliable relay suitable for all high-impedance circulating-current protection applications. The use of a static measuring circuit ensures constant and fast tripping times. Optionally, the relay is available with a bus-wire supervision feature. If during operation a differential current above the supervision pickup threshold but below the relay pickup voltage is detected, the differential
protection is blocked after a selectable span of time. The bus-wire supervision pickup threshold is settable by means
of jumpers. Likewise, the delay time for pickup of the supervision can be set by jumpers within a range between 1 s and 10 s. It is used for the protection of machine stator windings, busbars and transformer and reactor windings
against phase-to-phase and phase-to-earth short-circuits. As an option, the relay includes a bus-wire supervision and the differential function can be blocked by a binary input. The 7VH60A  relay is a single-pole sensitive current relay. The AC input impedance of the relay is adjusted by means of a series of high-wattage resistors. The relay setting in voltage pickup value is effected by removing shorting links from the rear terminals. When a shorting link is screwed between the terminals, the resistor is shorted out and when the shorting link is removed, the resistor is in circuit.

The SIPROTEC 7VH60 high-impedance differential relay contains all the components needed for:
• Acquisition and evaluation of measured values
• Operation and LED display
• Output of trip commands and signals
• Input and evaluation of binary signals
• Auxiliary voltage supply.
All protection functions including the DC/DC converter are accommodated on a printed circuit board of double height Eurocard format. An earthing screw is provided at the housing to which earthing strips can be connected
in order to ensure low-impedance earthing. The heavy-duty current plug connector provides automatic shorting of the CT circuits whenever the module is withdrawn. There are two unit versions available. The flush-mounting and cubicle-mounting versions have their terminals accessible from the rear.