CN2153863Y

CN2153863Y - Excess voltage protective non-fuse wire switch

Info

Publication number: CN2153863Y
Application number: CN 93201808
Authority: CN
Inventors: 苏子祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-05
Filing date: 1993-02-05
Publication date: 1994-01-19
Anticipated expiration: 2003-02-05

Abstract

The utility model relates to an excess voltage protective non-fuse wire switch. By adopting the original no-fuse wire switch, when the electric current exceeds to the rated capacity, the no-fuse wire switch can realize the open circuit by the action of the bimetal spring; on the basis of the circuit protection, a relay which is driven and attracted by the excess voltage is added, and the relay can be driven to release the action of the valve draw rod; so the switch can realize the broken circuit; thereby, the structure of the original no-fuse switch is improved, and the no-fuse wire switch can have the protection function of the excess current and excess voltage simultaneously. The utility model has simple and practical structure.

Description

Excess voltage protective non-fuse wire switch

The utility model relates to a kind of low-voltage electrical apparatus, exactly relates to a kind of no-fuse switch that can play the overvoltage protection effect.

Mains supply now is 110/220 volt of 110 volts of single-phase two wires or single-phase three-wire (Taiwan Province's power supply network) as shown in Figure 1.The electrical equipment that uses because of family mostly is 110 volts, so the power supply phase place in the family is all as shown in Figure 2, neutral line N is in case break, loose contact or short-circuit between conductors, and will make original rated voltage is that 110 volts electrical equipment bears 220 volts of voltages.For example, second family A line among Fig. 1 is 110 volts over the ground, through resistance, inductance or capacitor loop, like this, the N line also will inevitably have 110 volts of voltages over the ground, and the power supply that causes the first family and third family also becomes 220 volts, and, second family itself also can surpass more than 110 volts the voltage of its power supply because of the phase relation of resistance, inductance, and this overvoltage will inevitably be burnt household electrical appliance.

Usually, the accident of N line has following three kinds: 1.N line loose contact-voltage can be beated in the middle of 110～220 volts.2. broken string-voltage can rise to 220 volts from 110 volts of moments, but electric current is little.This situation will be the household electrical appliance scaling loss as continuing for 2～10 seconds.3. short-circuit between conductors-as A and N or B and N short circuit, voltage can directly become 220 volts from 110 volts, and electric current is very big.At this moment, in 1～2 second just the electrical equipment scaling loss.

The purpose of this utility model provides a kind of no-fuse switch of overvoltage protection; like this; during the first few cycle of the high pressure that causes when producing above-mentioned accident (being no more than 30 cycles), just with circuitry cuts, to reach the effect of protecting household electrical appliance in its abnormal ascending.

The utility model is on the original no-fuse switch that uses, and when keeping its original excess current protective function, increases over-voltage protection function and realizes.It includes overcurrent bimetal leaf, ZCT zero phase current transformer, switch handgrip, control circuit board and relief valve, it is characterized in that: place one at the pull bar downside of relief valve and can be driven the relay that attracts backward stick action and switch is opened circuit by overvoltage.

Below in conjunction with accompanying drawing, be described in detail it:

Fig. 1 is the schematic diagram of mains supply.

Fig. 2 is the electricity consumption phase diagram of perceptual electrical equipment, resistive electrical equipment.

Fig. 3 is an electrical schematic diagram of the present utility model.

Fig. 4 is mechanical structure external form figure of the present utility model.

Electrical control of the present utility model includes overvoltage protection control section and earth leakage protective control section.

Referring to Fig. 3, the overvoltage protection control section: power supply family, single-phase two wires is connected to the AN or the BN of electrical network, and single-phase three-wire power supply family is connected to the ANB of electrical network.When the circuit voltage between AN or BN surpasses rated voltage (for example 110 volts or 220 volts ± 15%), the output of IC1 (1 pin) is with regard to output signal, be connected to silicon controlled control utmost point G through D2 → R15 → D4, make it conducting, also make relay R LY power up action, inhale moving pull bar, touch relief valve and stopcock.The earth leakage protective control section: when the line electrical leakage value of being above standard, the output of IC2 (7 pin) output signal is connected to silicon controlled control utmost point G through D3 → R15 → D4; make it conducting; also make relay R LY power up action, inhale moving pull bar, touch relief valve and stopcock.

Among Fig. 4,1 is the overcurrent bimetal leaf, 2 is the ZCT zero phase current transformer, 3 is the switch handgrip, 4 is control circuit board, and 5 is relief valve, and overall appearance of the present utility model is similar substantially to the no-fuse switch that uses now, just length prolongs a little, above the coil of the length confession relay 6 that is increased is placed on.When relay 6(Fig. 3 represents with RLY) attract just to spur after the action pull bar of relief valve 5, no-fuse switch is become open circuit.It is identical with the no-fuse switch of overcurrent protection that this attraction pull bar makes switch become the operating principle of open circuit, just repeats no more at this.

Claims

1, a kind of no-fuse switch of overvoltage protection; include overcurrent bimetal leaf, ZCT zero phase current transformer, switch handgrip, control circuit board and relief valve, it is characterized in that: place one at the pull bar downside of relief valve and can be driven the relay that attracts backward stick action and switch is opened circuit by overvoltage.