CN201556523U - High voltage dry type current transformer with protecting gap - Google Patents

High voltage dry type current transformer with protecting gap Download PDF

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Publication number
CN201556523U
CN201556523U CN200920195081XU CN200920195081U CN201556523U CN 201556523 U CN201556523 U CN 201556523U CN 200920195081X U CN200920195081X U CN 200920195081XU CN 200920195081 U CN200920195081 U CN 200920195081U CN 201556523 U CN201556523 U CN 201556523U
Authority
CN
China
Prior art keywords
current transformer
high voltage
gap
primary winding
protecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN200920195081XU
Other languages
Chinese (zh)
Inventor
张树华
张丽珍
陈东生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Original Assignee
GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd filed Critical GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Priority to CN200920195081XU priority Critical patent/CN201556523U/en
Application granted granted Critical
Publication of CN201556523U publication Critical patent/CN201556523U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model belongs to the field of high voltage electrical apparatus, and relates to a high voltage dry type current transformer with a protecting gap, which comprises a primary coil (3), a secondary coil (5), a metal shielding cover (1), a bottom frame (8), a box body (7) and a protecting gap (2), wherein the primary coil (3) is made from a U-shaped steel pipe and a plurality of cables (4), and the secondary coil (5) is sleeved on two arms of the primary coil (3), is arranged on the bottom frame (8), and is protected by the box body (7). The protecting gap (2) is arranged in a head structure of the current transformer, because of the discharge characteristics of the protecting gap (2), the voltage drop which is produced when big current passes through the primary coil can not break through turn-to-turn insulation. The primary coil (3) is supported by a stainless steel tube, a main insulation is wound by an aluminum foil and polytetrafluoroethylene to form a structure of a capacitor panel (6), and the outer portion thereof is packed with a high voltage heat-shrinkable tubing which is used as an outer protecting sleeve. Because of the protective effect of the protecting gap, the high voltage dry type current transformer can achieve the measuring requirement of 0.2s grade high precision when achieving primary currents which are 1A and 2A small currents.

Description

A kind of high voltage dry-type current transformer of protecting the gap that has
Technical field
The utility model belongs to the High-Voltage Electrical Appliances field, is current measurement in 35kV and the above electric power system and a kind of high voltage dry-type current transformer of protecting the gap that has of used for relay protection.
Background technology
At present, the high voltage dry-type current transformer rated primary current major part on the domestic market all be 50A or more than, the form of primary winding mostly is a circle or multiturn formula, is no more than 8 circles at most.Yet the current transformer primary current of some special purpose is very little, is generally 1A, 2A or 5A, under the so little situation of primary current, reach 0.2S level high accuracy, must adopt the form that improves number of ampere turns to realize, this moment, the number of turn of primary winding was brought up to tens circles even circle up to a hundred.This structure is the inductance coil of a multiturn number with regard to the structure that makes primary winding, inductance coil is when short circuit current appears in the primary circuit, short circuit current is by an inductance coil, two ends at an inductance coil produce a bigger voltage drop, this has just formed an electrical potential difference, when this electrical potential difference is higher than the insulation level of turn-to-turn of primary winding, will cause the turn-to-turn discharge breakdown.Thereby cause current transformer to be scrapped.
Summary of the invention
Technical problem to be solved in the utility model be for the primary winding turn-to-turn insulation of protecting high voltage dry-type current transformer short circuit current by the time be not destroyed.Can realize simultaneously the requirement of little electric current high accuracy 0.2S level metering again.
The technical scheme that the utility model technical solution problem adopts: a kind of high voltage dry-type current transformer of protecting the gap that has is made up of protection gap, primary winding, secondary coil, metallic shield, casing, underframe and terminal board.Described protection gap is installed in the head of current transformer; be connected in parallel with primary winding P1, P2 two ends; this protection gap is made up of two metallic conductors; one end is cylindrical; the other end is conical; conical conductor tip direction is facing to cylindrical side; arcing distance between two conductors in protection gap is decided through designing and calculating according to the number of ampere turns of primary winding; be installed on the insulation board by two conductors; add a protective cover in the protection gap then; make in its space that is sealed in a sealing, be not subjected to ectocine.Described primary winding U type two arms are parallel to each other, pass steel pipe by many cables, form the structure of multiple circle formula, steel pipe wrapped in teflon film and aluminium foil constitute the capacitance plate of Main Insulation Structure of Electric, at capacitance plate outsourcing hot high pressure Heat-Shrinkable Tubings, outside the hot high pressure Heat-Shrinkable Tubings, be inserted in the silicon rubber full skirt and constitute external insulation then.Described secondary coil is made and is formed by iron core, enamelled wire, insulating material, and cover installs to primary winding then, and is installed on the underframe, and places casing.Described casing is made by stainless steel casing, can guarantee higher intensity, and can play the effect of supporting entire product.
Above-mentioned protective cover has certain intensity for the Merlon pressure injection is shaped.
Above-mentioned metallic shield is the cast aluminium alloy moulding, and smooth outer surface does not have the tip, and electric field change is even.
Above-mentioned cable is a copper core polyvinyl chloride flexible cable, and the good insulation withstand voltage level is arranged.
Advantage of the present invention:
A kind of high voltage dry-type current transformer of protecting the gap that has of the utility model; the function that its protection gap will be realized; be the protective current instrument transformer primary winding turn-to-turn insulation short circuit current by the time be not destroyed; mainly be when passing through primary winding owing to short circuit current; the voltage drop that the two ends of primary winding produce is bigger; the withstand voltage level that surpasses turn-to-turn insulation when this voltage drop; will cause primary winding turn-to-turn insulation to puncture; thereby cause the fault of product, need out of service when serious.The function in protection gap is exactly the primary winding turn-to-turn insulation puncture for fear of current transformer; principle is when short circuit current produces pressure drop by primary winding; the magnitude of voltage of its pressure drop is greater than the discharge voltage in protection gap; protect this moment the gap to produce discharge; thereby, avoid primary winding turn-to-turn insulation to puncture the primary winding short circuit.When short circuit current disappeared, the protection gap did not produce discharge.And current transformer is when operate as normal, and its primary winding is by rated primary current, and the voltage drop that the coil two ends produce is lower, does not reach the discharge voltage in protection gap, and protect the gap to be in open-circuit condition this moment.
Description of drawings
Fig. 1 is a contour structures schematic diagram of the present utility model
Fig. 2 is the schematic diagram in the utility model protection gap
The schematic diagram of Fig. 3 after for the assembling of the utility model protection gap
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3; a kind of high voltage dry-type current transformer of protecting the gap that has; comprise primary winding (3), secondary coil (5), metallic shield (1), underframe (8), casing (7) and protection gap (2), described primary winding (3) is made by U-shaped steel pipe and cable (4).Described secondary coil (5) is sleeved on primary winding (3) two arms, and places on the underframe (8), and is in casing (7) protection down.Described protection gap (2) is installed on the insulation board (9); head position as shown in Figure 1; the number of turn according to designing requirement and primary winding (3); regulate the arcing distance in protection gap (2); and then protective cover (10) is assemblied on protection gap (2); before the protective cover (10) in protection gap (2) is inserted primary winding (3) two ends; whether discharge under the voltage that sets in test protection gap (2) earlier; need be through test repeatedly; whether validation test result and design load be close; then just the assembling of the guard shield (10) in protection gap (2); again the two ends in protection gap (2) are connected on the P1 and the P2 two ends of primary winding (3) respectively, at last the metallic shield of head position (1) are assembled.
Described primary winding (3) is supported by stainless steel tube, and main insulation is alternately twined capacitance plate (6) structure that forms by aluminium foil and polytetrafluoroethylene, is surrounded by the hot high pressure Heat-Shrinkable Tubings outside it and makes oversheath.
Described secondary coil (5) is supported by underframe (8), and punching is in primary winding (3), and is protected by casing (7).

Claims (1)

1. one kind has the high voltage dry-type current transformer of protecting the gap, comprise primary winding (3), secondary coil (5), metallic shield (1), underframe (8), casing (7) and protection gap (2), described primary winding (3) U-shaped two arms are parallel to each other, and secondary coil (5) runs through by primary winding (3); Described secondary coil (5) and primary winding (3) are installed on the underframe (8), and place in the casing (7); Be inserted in the silicon rubber full skirt outside the described primary winding (3) and make external insulation; It is characterized in that: described protection gap (2) is installed in the head position of current transformer; be made up of two metallic conductors, an end is cylindrical, and the other end is conical; conical conductor tip direction faces toward cylindrical side, and is placed in the protective cover (10).
CN200920195081XU 2009-09-21 2009-09-21 High voltage dry type current transformer with protecting gap Expired - Fee Related CN201556523U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200920195081XU CN201556523U (en) 2009-09-21 2009-09-21 High voltage dry type current transformer with protecting gap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200920195081XU CN201556523U (en) 2009-09-21 2009-09-21 High voltage dry type current transformer with protecting gap

Publications (1)

Publication Number Publication Date
CN201556523U true CN201556523U (en) 2010-08-18

Family

ID=42616212

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200920195081XU Expired - Fee Related CN201556523U (en) 2009-09-21 2009-09-21 High voltage dry type current transformer with protecting gap

Country Status (1)

Country Link
CN (1) CN201556523U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104360132A (en) * 2014-11-14 2015-02-18 国家电网公司 Contact resistance live line measurement device
CN104360160A (en) * 2014-11-14 2015-02-18 国家电网公司 High-voltage loop contact resistor live line measurement device
CN104360163A (en) * 2014-11-14 2015-02-18 国家电网公司 Contact resistor live-line measurement device capable of preventing fault arcs
CN105244158A (en) * 2015-10-21 2016-01-13 成都迅德科技有限公司 Current transformer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104360132A (en) * 2014-11-14 2015-02-18 国家电网公司 Contact resistance live line measurement device
CN104360160A (en) * 2014-11-14 2015-02-18 国家电网公司 High-voltage loop contact resistor live line measurement device
CN104360163A (en) * 2014-11-14 2015-02-18 国家电网公司 Contact resistor live-line measurement device capable of preventing fault arcs
CN105244158A (en) * 2015-10-21 2016-01-13 成都迅德科技有限公司 Current transformer

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100818

Termination date: 20170921

CF01 Termination of patent right due to non-payment of annual fee