CN202333553U

CN202333553U - Metering box type transformer station with under-voltage trip protection function

Info

Publication number: CN202333553U
Application number: CN2011204727144U
Authority: CN
Inventors: 田洪峰; 王东华; 杨文博; 王海峰; 李尚锋
Original assignee: LAIWU LUNENG KAIYUAN GROUP ELECTRICAL APPLIANCE CO Ltd
Current assignee: LAIWU LUNENG KAIYUAN GROUP ELECTRICAL APPLIANCE CO Ltd
Priority date: 2011-11-24
Filing date: 2011-11-24
Publication date: 2012-07-11
Anticipated expiration: 2021-11-24

Abstract

The utility model discloses a metering box type transformer station with an under-voltage trip protection function, which comprises a box body, a high voltage inlet wire, a current transformer, a fuse protector, a load switch, a sub-gate button TA and a metering voltage transformer AB. The metering box type transformer station with the under-voltage trip protection function is characterized in that three voltage relays KV are arranged in the box body, two-phase of the three-phase input end of the current transformer is connected with a secondary power supply voltage transformer, two ends of the sub-gate button TA are connected with two output ends of the secondary power supply voltage transformer after the sub-gate button TA is in series connection with a shunt excitation coil FQ of the load switch, normally opened auxiliary contacts of the three voltage relays KV are respectively in parallel connection with the sub-gate button TA, and the coil input ends of the three voltage relays KV are respectively connected with corresponding three-phase of secondary voltage of the metering voltage transformer AB. When the fuse protector is burned down or the voltage transformers are burned down, the load switch can trip to be switched off timely, thereby preventing electric quantity loss.

Description

The metering box-type substation of band undervoltage trip protection

Technical field

The utility model relates to a kind of improvement of measuring box-type substation, and specifically a kind of metering box-type substation with the undervoltage trip protection is applicable under the box-type substation high pressure measurement condition and uses.

Background technology

At present, aspect the electric energy tariff of box-type substation, for the 10KV box-type substation that uses the high pressure measurement electricity charge; It comprises casing, 10KV voltage high pressure inlet wire, current transformer, fuse, on-load switch, opening button, metered voltage instrument transformer AB, and current transformer, fuse, on-load switch, opening button and metered voltage instrument transformer AB are installed in casing, the input termination 10KV high pressure inlet wire of current transformer; The output termination on-load switch of current transformer, the output termination fuse of current transformer, the output termination metered voltage instrument transformer AB of fuse; Opening button is connected with the shunt opening coil FQ of on-load switch, and pressing opening button can cut off the power supply by the operational load switch trip, and user side just has a power failure like this; Its weak point is: because the difference of environment for use fuse often occurs and burns, cause the metering of voltage phase shortage; The electricity consumption and the user can do as usual; Finally cause the metering of power supply charge department inaccurate, electric weight is lost, and causes economic loss.

Summary of the invention

It is a kind of simple in structure, easy to use that the purpose of the utility model is to provide, and when fuse burns or voltage transformer when burning, the on-load switch outage of in time tripping prevents the metering box-type substation of the band undervoltage trip protection that electric weight is lost.

In order to reach above purpose; The technical scheme that the utility model adopted is: the metering box-type substation of band undervoltage trip protection; Comprise casing, high pressure inlet wire, current transformer, fuse, on-load switch, opening button TA and metered voltage instrument transformer AB; Current transformer, fuse, on-load switch, opening button TA and metered voltage instrument transformer AB are installed, the high pressure inlet wire of the input termination 10KV voltage of current transformer, the output termination on-load switch of current transformer in casing; The output of current transformer also connects fuse; The output termination metered voltage instrument transformer AB of fuse is characterized in that: in casing, be provided with three voltage relay KV, the three-phase input end of current transformer wherein two connect the secondary power supply voltage transformer on mutually; Opening button TA is with after the shunt opening coil FQ of on-load switch connects; Two ends are connected with two outputs of secondary power supply voltage transformer, and the auxiliary contact of often opening of three voltage relay KV are connected in parallel with opening button TA respectively, and the coil input end of three voltage relay KV is connected with the corresponding three-phase of metered voltage instrument transformer AB secondary voltage respectively.

The beneficial effect of the utility model is: simple in structure, easy to use, when fuse burns or voltage transformer when burning, the on-load switch outage of in time tripping has prevented that electric weight from losing, and has avoided power supply charging department to cause economic loss.

Description of drawings

Fig. 1 looks sketch map for the structure master of the utility model;

Fig. 2 is the voltage relay of the utility model and the connecting circuit principle schematic of opening button;

Fig. 3 is the connecting circuit principle schematic of the voltage relay and the metered voltage instrument transformer of the utility model;

Among the figure: 1, metered voltage instrument transformer AB; 2, current transformer; 3, fuse; 4, on-load switch; 5, opening button TA; 6, voltage relay KV; 7, secondary power supply voltage transformer; 8, casing; 9, high pressure inlet wire.

Embodiment

Make the utility model with reference to accompanying drawing 1,2,3.The metering box-type substation of this band undervoltage trip protection; Comprise casing 8, high pressure inlet wire 9, current transformer 2, fuse 3, on-load switch 4, opening button TA5 and metered voltage instrument transformer AB1; Current transformer 2, fuse 3, on-load switch 4, opening button TA5 and metered voltage instrument transformer AB1 are installed in casing 8; The high pressure inlet wire 9 of the input termination 10KV voltage of current transformer 2; The output termination on-load switch 4 of current transformer 2, the output of current transformer 2 also connects fuse 3, the output termination metered voltage instrument transformer AB1 of fuse 3; It is characterized in that: in casing 8, be provided with three voltage relay KV6; The three-phase input end of current transformer 2 wherein two connect secondary power supply voltage transformer 7 on mutually, 10KV voltage is become 220V voltage, for on-load switch 4 provides independent operating voltage; Opening button TA5 is with after the shunt opening coil FQ of on-load switch 4 connects; Two ends are connected with two outputs of secondary power supply voltage transformer 7, and the auxiliary contact of often opening of three voltage relay KV6 are connected in parallel with opening button TA5 respectively, and the coil input end of three voltage relay KV6 is connected with the corresponding three-phase of metered voltage instrument transformer AB1 secondary voltage respectively.

During use; Secondary power supply voltage transformer 7 adopts JDZR-10R 10/0.22 voltage transformer, and voltage relay KV 6 adopts DY-2C type voltage relay, because secondary power supply voltage transformer 7 directly is connected on high pressure inlet wire 9 ends; Guaranteed the stability of secondary power supply voltage transformer 7 output voltages; For on-load switch 4 provides stable power, when normal power supply, the energising of the input of three voltage relay KV6; The auxiliary contact of often opening of three voltage relay KV6 are in off-state, and equipment work is normal; When in three fuses 3 in the measurement loop any burnt, when perhaps arbitrary in the three-phase of metered voltage instrument transformer AB burns mutually, one input outage among three voltage relay KV6; It is often driven auxiliary contact and is in closed "on" position, thereby makes the shunt opening coil FQ energising of on-load switch 4, the outage of operational load switch 4 would trips; Prevent electric quantity loss; Reduce the loss of power supply department, ensured the normal operation of equipment, improved economic benefit of enterprises.

Claims

1. be with the metering box-type substation of undervoltage trip protection; Comprise casing (8), high pressure inlet wire (9), current transformer (2), fuse (3), on-load switch (4), opening button TA (5) and metered voltage instrument transformer AB (1); Current transformer (2), fuse (3), on-load switch (4), opening button TA (5) and metered voltage instrument transformer AB (1) are installed in casing (8); The high pressure inlet wire (9) of the input termination 10KV voltage of current transformer (2); The output termination on-load switch (4) of current transformer (2); The output of current transformer (2) also connects fuse (3); The output termination metered voltage instrument transformer AB (1) of fuse (3) is characterized in that: in casing (8), be provided with three voltage relay KV (6), the three-phase input end of current transformer (2) wherein two connect secondary power supply voltage transformer (7) on mutually; Opening button TA (5) is with after the shunt opening coil FQ of on-load switch (4) connects; Two ends are connected with two outputs of secondary power supply voltage transformer (7), and the auxiliary contact of often opening of three voltage relay KV (6) are connected in parallel with opening button TA (5) respectively, and the coil input end of three voltage relay KV (6) is connected with the corresponding three-phase of metered voltage instrument transformer AB (1) secondary voltage respectively.