CN202772545U

CN202772545U - Safe power supply device for isolation transformer

Info

Publication number: CN202772545U
Application number: CN 201220383948
Authority: CN
Inventors: 刘卫民; ***; 张春勇; 尹川
Original assignee: JIANGSU MINING ENGINEERING GROUP Co Ltd
Current assignee: JIANGSU MINING ENGINEERING GROUP Co Ltd
Priority date: 2012-08-05
Filing date: 2012-08-05
Publication date: 2013-03-06
Anticipated expiration: 2022-08-05

Abstract

The utility model discloses a safe power supply device for an isolation transformer, which relates to the field of safe power supply technology. The device comprises an isolation transformer T1. The primary coil of the isolation transformer T1 is connected with a power supply through a leakage circuit breaker QF1. The secondary coil of the isolation transformer T1 is connected with a no-voltage release air switch QF2 and a thermal relay KH. An overload alarm circuit, an overload protection circuit, an insulation detection circuit, an insulation detection time-delay circuit, an insulation detection alarm circuit and an insulation detection trip circuit are connected between a power line and a zero line. Due to the adoption of the safe power supply device, when a line-to-ground fault occurs in a system, an insulation resistance monitor can immediately output a signal for alarming and actuating elements. The insulation resistance monitor acts on alarm and action elements to sound an audio alarm and make the system trip out to power off the system. Compared with an original device, the above device is additionally endowed with alarm and power-off functions, so that potential safety hazards are effectively avoided.

Description

Isolating transformer safe power supply device

Technical field

The utility model relates to the safe power supply technical field, specifically a kind of isolating transformer safe power supply device.

Background technology

Use in the temporary electricity system at the construction field (site) the isolating transformer electric supply installation is arranged, its secondary side isolated neutral of original device, when touching a phase firewire, the people electric shock accidents can not occur, if but after the phase firewire generation earth fault, touch again other live wire or zero line, and when touching live wire again behind the zero line grounding then electric shock accidents can occur, there is larger potential safety hazard.

Summary of the invention

The potential safety hazard that exists in order to eliminate former isolation transformer-supplied device, the utility model provides a kind of isolating transformer safe power supply device, when having circuit that ground connection occurs, sends audible alarm and makes system's tripping operation outage, realizes safe power supply.

The utility model is realized with following technical scheme: a kind of isolating transformer safe power supply device, comprise isolating transformer T1, the primary winding of isolating transformer T1 connects power supply by residual current circuit breaker QF1, and secondary coil connects no-voltage trip air switch QF2, thermal relay KH; Between live wire and zero line, be connected with overload-alarm circuit and overload protecting circuit; Described overload-alarm circuit comprises normally opened contact and the audible-visual annunciator HA1 of the thermal relay KH of series connection, is parallel with time relay KT1 coil at the two ends of audible-visual annunciator HA1, consists of the overload delay circuit; Described overload protecting circuit comprises the timing closing normally opened contact of time relay KT1 of series connection and the tripping coil of no-voltage trip air switch QF2, and the main contacts of no-voltage trip air switch QF2 is connected between isolating transformer T1 and the thermal relay KH; It is characterized in that: between live wire and zero line, be connected with insulation and detect loop, insulation detection timing circuit and insulation detection alarm loop; Described insulation detects the loop and comprises an insulation resistance monitor, 1 pin of insulation resistance monitor and the 6 pin line of starting to exchange fire, 2 pin and 3 pin connecting to neutral lines, 5 pin ground connection; Described insulation detects timing circuit and comprises that one is connected to the auxiliary relay KA1 coil on insulation resistance monitor 7 pin, the a pair of normally opened contact of the auxiliary relay KA1 time relay K T2 coil of connecting is connected between live wire and the zero line, and the timing closing normally opened contact two ends that a pair of timing closing normally opened contact of time relay KT2 is connected in parallel on time relay KT1 consist of insulation and detect trip(ping) circuit; Described insulation detection alarm loop comprise auxiliary relay KA1 another to normally opened contact and audible-visual annunciator HA2.

The beneficial effects of the utility model are: when having circuit that ground connection occurs in the system, the insulation resistance monitor is output signal immediately, acts on warning, action element, sends audible alarm and makes system's tripping operation outage, comparing with original device has increased warning, power down function, has effectively stopped potential safety hazard.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing;

Fig. 1 is the utility model circuit diagram;

Fig. 2 is temperature-control circuit figure.

Embodiment

As shown in Figure 1, a kind of isolating transformer safe power supply device comprises isolating transformer T1, and the primary winding of isolating transformer T1 connects power supply by residual current circuit breaker QF1, and secondary coil connects no-voltage trip air switch QF2, thermal relay KH; Between live wire and zero line, be connected with overload-alarm circuit and overload protecting circuit; Described overload-alarm circuit comprises normally opened contact and the audible-visual annunciator HA1 of the thermal relay KH of series connection, is parallel with time relay KT1 coil at the two ends of audible-visual annunciator HA1, consists of the overload delay circuit; Described overload protecting circuit comprises the timing closing normally opened contact of time relay KT1 of series connection and the tripping coil of no-voltage trip air switch QF2, and the main contacts of no-voltage trip air switch QF2 is connected between isolating transformer T1 and the thermal relay KH; Between live wire and zero line, be connected with insulation and detect loop, insulation detection timing circuit and insulation detection alarm loop; Described insulation detects the loop and comprises an insulation resistance monitor, 1 pin of insulation resistance monitor and the 6 pin line of starting to exchange fire, 2 pin and 3 pin connecting to neutral lines, 5 pin ground connection; Described insulation detects timing circuit and comprises that one is connected to the auxiliary relay KA1 coil on insulation resistance monitor 7 pin, the a pair of normally opened contact of the auxiliary relay KA1 time relay K T2 coil of connecting is connected between live wire and the zero line, and the timing closing normally opened contact two ends that a pair of timing closing normally opened contact of time relay KT2 is connected in parallel on time relay KT1 consist of insulation and detect trip(ping) circuit; Described insulation detection alarm loop comprise auxiliary relay KA1 another to normally opened contact and audible-visual annunciator HA2.

As shown in Figure 2, secondary coil at isolating transformer T1 is connected with temperature-control circuit, described temperature-control circuit comprises temperature monitor TDE-2001, the common limb of temperature monitor TDE-2001 and middle pin connecting to neutral line, the phase pin line of starting to exchange fire, series connection one auxiliary relay KA2 coil on the low pin, two pairs of normally opened contacts of auxiliary relay KA2 are connected respectively and are connected in parallel between live wire and the zero line behind the fan.

The course of work: the circuit in using electricity system, apparatus insulated when normal, 6 of SJY-12 type insulation resistance monitor, 7 pin are off-state, work as circuit, when equipment generation earth fault insulating resistance value is lower than the set point (0.5M Ω) of monitor, 6,7 pin conductings, auxiliary relay KA1 coil gets electric adhesive, its the first couple normal battle of closure makes time relay KT2 coil get electric, the conducting after time-delay of KT2 timing closing contact, make the tripping coil action of no-voltage trip air switch QF2, switch trip, the whole system outage, needing fault to get rid of the normal rear switch of insulating resistance value recovery can close, another is closed to normal battle for auxiliary relay KA1, and it is electric then buzzer HA2 to be got, and sends audible alarm.

When isolating transformer T1 reached design temperature, auxiliary relay KA2 got electric, and its normally opened contact is closed, and fan gets electric startup, made isolating transformer T1 cooling.

The insulation resistance monitor all can be monitored live wire, zero line; and it is Real-Time Monitoring; monitoring range Ke Tiao ﹙ 0---9.9M Ω ﹚; band no-voltage trip device air switch can trip after obtaining actuating signal immediately; the combination of the two and isolating transformer has realized comprehensive, overall process, highly sensitive power supply protection.

Claims

1. an isolating transformer safe power supply device comprises isolating transformer T1, and the primary winding of isolating transformer T1 connects power supply by residual current circuit breaker QF1, and secondary coil connects no-voltage trip air switch QF2, thermal relay KH; Between live wire and zero line, be connected with overload-alarm circuit and overload protecting circuit; Described overload-alarm circuit comprises normally opened contact and the audible-visual annunciator HA1 of the thermal relay KH of series connection, is parallel with time relay KT1 coil at the two ends of audible-visual annunciator HA1, consists of the overload delay circuit; Described overload protecting circuit comprises the timing closing normally opened contact of time relay KT1 of series connection and the tripping coil of no-voltage trip air switch QF2, and the main contacts of no-voltage trip air switch QF2 is connected between isolating transformer T1 and the thermal relay KH; It is characterized in that: between live wire and zero line, be connected with insulation and detect loop, insulation detection timing circuit and insulation detection alarm loop; Described insulation detects the loop and comprises an insulation resistance monitor, 1 pin of insulation resistance monitor and the 6 pin line of starting to exchange fire, 2 pin and 3 pin connecting to neutral lines, 5 pin ground connection; Described insulation detects timing circuit and comprises that one is connected to the auxiliary relay KA1 coil on insulation resistance monitor 7 pin, the a pair of normally opened contact of the auxiliary relay KA1 time relay K T2 coil of connecting is connected between live wire and the zero line, and the timing closing normally opened contact two ends that a pair of timing closing normally opened contact of time relay KT2 is connected in parallel on time relay KT1 consist of insulation and detect trip(ping) circuit; Described insulation detection alarm loop comprise auxiliary relay KA1 another to normally opened contact and audible-visual annunciator HA2.

2. isolating transformer safe power supply device according to claim 1, it is characterized in that: the secondary coil at isolating transformer T1 is connected with temperature-control circuit, described temperature-control circuit comprises temperature monitor TDE-2001, the common limb of temperature monitor TDE-2001 and middle pin connecting to neutral line, the phase pin line of starting to exchange fire, series connection one auxiliary relay KA2 coil on the low pin, two pairs of normally opened contacts of auxiliary relay KA2 are connected respectively and are connected in parallel between live wire and the zero line behind the fan.