CN201910617U

CN201910617U - Composite monitor type voltage limiting device

Info

Publication number: CN201910617U
Application number: CN201020681963XU
Authority: CN
Inventors: 肖飒
Original assignee: ANHUI SANHE ELECTRIC POWER TECHNOLOGY Co Ltd
Current assignee: ANHUI SANHE ELECTRIC POWER TECHNOLOGY Co Ltd
Priority date: 2010-12-27
Filing date: 2010-12-27
Publication date: 2011-07-27
Anticipated expiration: 2020-12-27

Abstract

The utility model relates to a composite monitor type voltage limiting device, which comprises a zinc oxide component which is in star triangular connection. Three-phase high-voltage lines A, B and C are respectively connected with the zinc oxide component via a thermal separator and a current transformer, a neutral point E of the zinc oxide component is grounded via a protective resistor R0, a sampling resistor R11 is parallelly connected onto the protective resistor R0, and two ends of the sampling resistor R11 are connected with an online monitor which is used for monitoring voltage at two ends of the sampling resistor R11 at real time. The zinc oxide component is a gapless structure which is in the shape of a star triangle, does not have action dispersivity, and can effectively protect insulation of power utilization equipment against being damaged by overvoltage. The composite monitor type voltage limiting device can limit interphase and phase-ground overvoltage amplitude, is stable in overvoltage action, guarantees self safety well, can double phase-ground flow rate, and simultaneously can be used with the online monitor so that monitoring operation conditions of the voltage limiting device can be monitored at real time.

Description

Compound monitor-type pressure limiting device

Technical field

The utility model relates to a kind of compound monitor-type pressure limiting device.

Background technology

At present, the overvoltage protection product mainly used of market has single metal oxide arrester, four stars type gapless metal-oxide lighting arrester, four stars type that the series gap metal oxide arrester is arranged.Wherein, single metal oxide arrester acts on substantially without limits to alternate switching overvoltage; Chargeability was very high when four stars type gapless metal-oxide lighting arrester normally moved, and was difficult to the long-term safety reliability service; Have the action of series gap metal oxide arrester dispersed big, the overvoltage operating value is very unstable.

The utility model content

The purpose of this utility model is to provide a kind of can better protect, move compound monitor-type pressure limiting device stable, safe operation to alternate and overvoltage mutually.

For achieving the above object; the utility model has adopted following technical scheme: a kind of compound monitor-type pressure limiting device; comprise and be the zinc oxide assembly that the star triangular shape connects; three-phase high-voltage line A, B, C link to each other with the zinc oxide assembly by hot disconnector summation current transformer respectively; the neutral point E of zinc oxide assembly is by protective resistance R0 ground connection; sample resistance R11 is attempted by on the protective resistance R0, and the two ends of sample resistance R11 link to each other with the on-line monitoring instrument that is used for monitoring in real time sample resistance R11 both end voltage.

As shown from the above technical solution, the zinc oxide assembly adopts the gapless structure of star triangular shape in the utility model, and the attonity dispersiveness can effectively protect the power consumption equipment insulation to avoid the overvoltage infringement.The utility model can limit alternate and phase ground overvoltage amplitude, the overvoltage operating value is stable, cutting speed is fast, self-security has had good guarantee again, mutually the ground through-current capacity can increase and is twice, reach 1200A, can be used the operation conditions that to monitor pressure limiting device in real time with the on-line monitoring instrument simultaneously.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

A kind of compound monitor-type pressure limiting device; comprise and be the zinc oxide assembly that the star triangular shape connects; three-phase high-voltage line A, B, C link to each other with the zinc oxide assembly by hot disconnector summation current transformer respectively; the neutral point E of zinc oxide assembly is by protective resistance R0 ground connection; sample resistance R11 is attempted by on the protective resistance R0; the two-terminal a of sample resistance R11, b link to each other with the on-line monitoring instrument that is used for monitoring in real time sample resistance R11 both end voltage, and the on-line monitoring instrument can be monitored the leakage current of sampling zinc oxide assembly in real time by sample resistance R11.As shown in Figure 1.This special star triangle connects, no matter under normal operation or the single-phase earthing situation, chargeability can both meet the demands as calculated, and alternate and residual voltage value mutually all are lower than the insulation level of equipment.

As shown in Figure 1, described zinc oxide assembly is made up of ZnO resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, ZnO resistors R1, R2, R3, R4, R5, R6 form series loop, the end of ZnO resistors R7, R8, R9 is connected to neutral point E, the other end of ZnO resistors R7 is connected between ZnO resistors R1, the R2, the other end of ZnO resistors R8 is connected between ZnO resistors R3, the R4, and the other end of ZnO resistors R9 is connected between ZnO resistors R5, the R6.Described hot disconnector is made up of first, second and third hot disconnector TLA, TLB, TLC, and described current transformer is made up of first, second and third current transformer CTA, CTB, CTC.With 10KV power station type pressure limiting device is example; ZnO resistors R1～R6 DC reference voltage 〉=12.5KV; alternate lightning impulse residual voltage≤42 KV; ZnO resistors R7～R9 DC reference voltage 〉=11.5KV; phase ground lightning impulse residual voltage≤41 KV; alternate and residual voltage value mutually all are lower than the withstand voltage value of 10KV equipment, so the overvoltage infringement is avoided in alternate and insulation mutually that can fine protection power consumption equipment.ZnO resistors R1～R6 chargeability≤71%, ZnO resistors R7～R9 chargeability≤44% all less than 75%, satisfies the requirement of zinc oxide arrester for chargeability.

As shown in Figure 1, described high-voltage line A links to each other with the end of the first hot disconnector TLA, the other end of the first hot disconnector TLA is connected on ZnO resistors R4, between the R5, first hot disconnector TLA and the ZnO resistors R4, the line of R5 passes the round iron core of the first current transformer CTA, high-voltage line B links to each other with the end of the second hot disconnector TLB, the other end of the second hot disconnector TLB is connected on ZnO resistors R1, between the R6, second hot disconnector TLB and the ZnO resistors R1, the line of R6 passes the round iron core of the second current transformer CTB, high-voltage line C links to each other with the end of the 3rd hot disconnector TLC, the other end of the 3rd hot disconnector TLC is connected on ZnO resistors R2, between the R3, the 3rd hot disconnector TLC and ZnO resistors R2, the line of R3 passes the round iron core of the 3rd current transformer CTC.When this device for some reason thermal runaway took place, hot disconnector moved rapidly, avoided the phase fault that causes because of the thermal runaway of this device.

During normal the operation, ZnO resistors R1～R9 is a high resistance state, and Leakage Current is minimum, does not influence the normal operation of system.By the on-line monitoring instrument from the sample resistance R11 number of winning the confidence, monitor the pressure limiting device aging performance in real time, after arbitrary zinc oxide assembly wears out among ZnO resistors R1～R9, the electric current of sample resistance R11 of flowing through all will increase, sample resistance R11 electric current is long-time to become big a lot of if collect, and illustrates that the zinc oxide assembly occurs aging in the pressure limiting device.

When system overvoltage occurred and reaches certain amplitude, the corresponding oxidation zinc component moved rapidly.If between the BD, when just overvoltage occurring between high-voltage line B and the ground, ZnO resistors R1, R6, the rapid conducting of R7, R9, with the overvoltage amplitude limitation in power consumption equipment insulation tolerance range.Because of moment after ZnO resistors R1, R6, R7, the R9 conducting very big by electric current, on the second current transformer CTB, can induce very big electric current, gather the overvoltage action frequency for the on-line monitoring instrument and use.If between the BC, when just overvoltage occurring between high-voltage line B, the C, the then rapid conducting of ZnO resistors R1, R2 can induce very big electric current on the second current transformer CTB and the 3rd current transformer CTC, gather the overvoltage action frequency for the on-line monitoring instrument and use.After having served as loss of voltage, the zinc oxide assembly recovers high-impedance state again.

When this device for some reason thermal runaway took place, hot disconnector moved rapidly, avoided the phase fault that causes because of the thermal runaway of this device.

Claims

1. compound monitor-type pressure limiting device; it is characterized in that: comprise being the zinc oxide assembly that the star triangular shape connects; three-phase high-voltage line A, B, C link to each other with the zinc oxide assembly by hot disconnector summation current transformer respectively; the neutral point E of zinc oxide assembly is by protective resistance R0 ground connection; sample resistance R11 is attempted by on the protective resistance R0, and the two ends of sample resistance R11 link to each other with the on-line monitoring instrument that is used for monitoring in real time sample resistance R11 both end voltage.

2. compound monitor-type pressure limiting device according to claim 1, it is characterized in that: described zinc oxide assembly is made up of ZnO resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, ZnO resistors R1, R2, R3, R4, R5, R6 form series loop, the end of ZnO resistors R7, R8, R9 is connected to neutral point E, the other end of ZnO resistors R7 is connected between ZnO resistors R1, the R2, the other end of ZnO resistors R8 is connected between ZnO resistors R3, the R4, and the other end of ZnO resistors R9 is connected between ZnO resistors R5, the R6.

3. compound monitor-type pressure limiting device according to claim 1 and 2, it is characterized in that: described hot disconnector is made up of first, second and third hot disconnector TLA, TLB, TLC, and described current transformer is made up of first, second and third current transformer CTA, CTB, CTC.

4. according to claim 1 or 2 or 3 described compound monitor-type pressure limiting devices, it is characterized in that: described high-voltage line A links to each other with the end of the first hot disconnector TLA, the other end of the first hot disconnector TLA is connected on ZnO resistors R4, between the R5, first hot disconnector TLA and the ZnO resistors R4, the line of R5 passes the round iron core of the first current transformer CTA, high-voltage line B links to each other with the end of the second hot disconnector TLB, the other end of the second hot disconnector TLB is connected on ZnO resistors R1, between the R6, second hot disconnector TLB and the ZnO resistors R1, the line of R6 passes the round iron core of the second current transformer CTB, high-voltage line C links to each other with the end of the 3rd hot disconnector TLC, the other end of the 3rd hot disconnector TLC is connected on ZnO resistors R2, between the R3, the 3rd hot disconnector TLC and ZnO resistors R2, the line of R3 passes the round iron core of the 3rd current transformer CTC.