FI121723B - Earth fault relay - Google Patents

Description

FAULT CURRENT PROTECTION SWITCH

TECHNICAL FIELD The invention relates to an earth leakage circuit breaker.

More particularly, the invention relates to a voltage-independent RCD with a switch component which functions in particular as a contact, switch and trip element, a control and measurement circuit for measuring the RCD and a switch n-10, and an excitation button and test button for RCD the measuring circuit has an RCD, such as a sum current transformer, and wherein the RCD is provided with a housing having a housing portion and 15 cover portions.

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The RCD is a sensitive protection device which complements the protection provided by fuses in hazardous operating conditions. The RCD will quickly trip the circuit in the event of an initial failure of the electrical equipment or the -20 wiring resulting in a dangerous leakage current to a person. An ordinary fuse cannot detect and trigger such a low current fault. The moment the fault current reaches or exceeds the dangerous limit (the trip current is in the order of a few tens of mA, typically 30 mA), the RCD will cut off the power supply very quickly (in fractions of 25 seconds). Even in such a worst case scenario, a person will receive only a small electric shock before the power is cut off. Failure currents can also be transmitted to the ground in other ways than through humans or animals, eg surface discharge currents in building components. There is always a risk of fire.

oo 30 The earth leakage circuit breaker operates as follows: When the electrical appliance is operating, the electrical current at and from the power supply is equal. Differences between the input and output current occur when a fault current occurs. The RCD switch controls the amount of current entering and exiting the electrical appliance. As long as these quantities are equal, the electric current can pass unhindered. If part of the electrical current is transferred to the ground as a fault current, the RCD will then detect a difference between the incoming and outgoing currents. The moment the fault current reaches or exceeds 2 dangerous limits, the power supply is interrupted. The earth leakage circuit breaker is equipped with a magnetic tripping device or equivalent electronic relay control circuit.

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Known RCDs are available in versions mounted on a circuit board 5, built into a wall outlet, mounted between a wall outlet and a load, and built into an extension cable.

There are two types of RCDs, voltage dependent, and

voltage-independent. I

s 10 {The voltage-independent RCD is only tripped in RCD mode, but the controlled output contact does not open, for example, in the event of a power failure, and thus does not have to be re-energized when the voltage returns. The RCD can be used, for example, to protect the freezer sockets.

15 The device plugged into the wall outlet will operate normally when the power is restored.

The voltage-dependent RCD also trips only in the RCD condition, but the controllable output contact opens, for example, in the event of a power failure, thus requiring the RCD to be re-armed when the voltage 20 returns. This type of RCD cannot be used, for example to protect sockets on the freezer. The device plugged into the wall outlet does not operate normally when the voltage returns.

Voltage-dependent models may be made substantially smaller than voltage-independent models in physical size, but may be used in a more limited manner, as discussed above. O Prior art g 30 A known voltage-independent RCD is shown in Fig. 1a and section A-A in Fig. 1b. . The known device has

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^ a round base (housing part) 1 and a cover part 2, and a tin plate mounting frame 3 disposed therebetween, having fastening holes for mounting the box ^ 4. In addition, it has a head / tuning lever 5 fitted inside the housing, 35 line main / tuning shaft 13, test button 6, and total current transformer coil 7

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and a contact, switch, and trip element (component 8) controlled by a trigger! 13 with a ripple relay 22, as well as a diode package 20 and a mass resistor 21 in which the components of the control and measuring circuit are disposed on the element 8.

Known RCDs with a voltage-independent vi-5 ripple function have the physical size of the device in question, especially its high height, and the design of the device is critical to their limited use.

Summary of the Invention 10

The object of the invention is to eliminate the drawbacks of the prior art and to provide an earth leakage protection which, when implemented according to the structure of the invention, can be mounted on several individual and device manufacturers' equipment solutions, such as inside the device, device cover, or external device device.

According to the invention, this object can be achieved by moving the sum current transformer and test circuit of the RCD and the external diode packet of the trip relay outside the prior art circular base 20 in separate spaces therefor, , the less bulky components mounted on the circuit board, whereby the total current transformer coil of the device, and the array of the test button and trip relay diode packet and the measuring resistor mass resistor placed on the circuit board may have been moved to their separate spaces inside the device.

This provides a solution that changes the physical form of the known earth-leakage circuit breaker and results in a significantly smaller i g 30 of all physical dimensions, especially lower than the well-known x solutions, and a more versatile voltage-independent fault solution.

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power protection solution.

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More specifically, the fault current protection device according to the invention is characterized by what is set forth in the characterizing part of claim 1.

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Preferred embodiments of the invention are set forth in the other claims.

Brief Description of the Drawings

In the following, the invention will be explained in more detail by way of example with reference to the accompanying drawings in which

Fig. 1a shows a known earth leakage circuit breaker and Fig. 1b is a sectional view A-A, Fig. 2a shows a top current protection circuit breaker according to the invention, Fig. 2b section B-B, Fig. 2c top view and Fig. 2d in section C-C, earth-leakage circuit breaker as viewed through an opening in the panel of the electrical panel.

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DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

The RCD according to the invention has a body having a base f part 9 and a cover part 10 enlarged / extended relative to the prior art solution to form a rounded breaker side end and an angled control part side end so that the sum current transformer coil 7 can be located. as opposed to the old solution, together with the measuring and control circuit, in a separate space separated by a wall 28 adjacent to the contact, switch, and trip element 8 on the outside of the circular base, thereby providing space for the base and a complete resistor board (Fig. 1) and diode pack 20 (Fig. 1) on a complete replacement circuit board 12 on which these replacement components (a test circuit test button being a push button 25 mounted on a circuit breaker 26, a mass resistor 26 and a diode pack 27) are disposed. . The power transformer coil 7 and the circuit board 12 are thus aligned with the contact, switch, o x, and trip element 8.

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Also, the main / tuning levers 5 (Fig. 1) attached to the metal main switch rotary shaft 13 o of the known design have been replaced by a single torque section 35 la 14.

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The contact, switch, and trip element 8 is the same in the device according to the invention as in the known device. The earth leakage circuit breaker according to the invention can be mounted on the bottom or on the inside of the cover via the mounting holes 15. For fastening the contact, switch, and trip element to the base member, there are 5 quick attachment lugs made in the solution of the invention. 16.

In the exemplary case, the RCD according to the invention is mounted inside an old plug fuse box, whereby its tuning and testing buttons are visible and accessible through the opening 10 of the 25A fuse base.

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Fig. 3 shows through the opening 23 in the panel cover 18 a knob 14 and a microswitch button 12 of the RCD test circuit.

It will be apparent to one skilled in the art that various embodiments of the invention are not limited to the above example, but may vary within the scope of the following claims. The diodes and capacitors of the test circuit and the Saturday-20 ripple relay may be surface-coupled. In addition to the curved portion, the partition wall 28 may comprise a wall dividing the transformer and the circuit board.

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Claims (6)

A voltage-independent earth-fault circuit breaker having a switch component (8) which functions in particular as a contact, switch and trip element, a control and measurement circuit for measuring the fault current and controlling a switch component, and an excitation button for testing and - and the measuring circuit has a residual current transformer (7), such as a sum current transformer, and wherein the residual current circuit breaker has a housing having a housing part (base part) and a cover part, ϊ f. characterized in that the test button (25), the measuring circuit mass resistor (26) and the diode packet (20) when it is triggered are all connected to the same circuit board thus constituted by the circuit board and the assembly 20 comprising said components (20, 25, 26) , and the earth-fault transformer (7) is arranged in a second space arranged adjacent to the switch component (8) and the assembly of the above-mentioned circuit board and said components to provide a low-earth earth-leakage circuit breaker. \ The earth leakage circuit breaker according to claim 1, characterized in that adjacent spaces are separated by a wall (28). o c3 The earth leakage circuit breaker according to any one of the preceding claims, characterized in that the test button for the test circuit is a push button (25) mounted on a circuit board with a micro switch. X CC The earth-leakage circuit breaker according to any one of the preceding claims, characterized in that the diodes and capacitors of the test circuit and the trip relay are of the surface connection type. o O C \ J! | ; ί l i The earth-leakage circuit breaker according to any one of the preceding claims, characterized in that the device can be mounted via the same mounting holes (15) either as a base or surface mounting. The earth-leakage circuit breaker according to any one of the preceding claims, characterized in that the switch component (8) of the device locks into the base of the device by means of claws (16). i i! 5 i I-. t. · ί · i.} i f j f · j. O δ CVJ 00 0 cc CL 00 o o o o C \ J